Servo oil supercharged ejector performance test system and device

Abstract

The servo oil supercharged injector performance test system and device provided by the invention solve the problem that the system and device cannot be suitable for performance tests of various new fuel injection systems, realize effective inspection of injection rules and verification of system performance, and further provide guarantee for subsequent development of new fuel engines.

Description

Technical Field

[0001] The present invention relates to the technical field of injectors, and particularly to a performance test system and device for a servo oil supercharging injector. Background Art

[0002] The development of injectors is one of the most core key technologies for developing engines. Building a simple performance test system suitable for the injection system of a servo oil supercharging injector helps analyze the injection law and various influencing factors, verify the performance of the newly developed engine fuel supply system, and check the rationality of each design and control parameter, which is an essential step before the engine ignition.

[0003] However, the traditional test bench for diesel engine injection systems cannot be applied to the performance test of various new fuel injection systems, and there is currently no test system on the market with high detection accuracy and suitable for the injection law of high-power engines with different characteristic fuels. Summary of the Invention

[0004] The purpose of the present invention is to provide a performance detection system and device for a servo oil supercharging injector that is generally applicable to various fuels, so as to effectively test the injection law and verify the system performance, and thus provide guarantee for the subsequent development of new fuel engines.

[0005] The technical solution of the present invention provides a performance test device for a servo oil supercharging injector, including:

[0006] The 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, and the servo oil control valve 5 is connected to the injector 16 through a pipeline;

[0007] The fuel tank 6, fuel filter 7, fuel pressurizing pump 8, fuel pressure stabilizing tank 9, regulating valve 10, heat exchanger 11, three-way valve 12, first DBB valve 13, and first breather valve 14 are connected to the injector 16 through pipelines. A first hydrocarbon sensor 15 is provided in the pipeline where the first breather valve 14 is connected to the injector 16;

[0008] The injector 16 is partially inserted into the fuel pressure measurement chamber 17. The fuel pressure measurement chamber 17, safety protection valve 20, pressure regulating valve 21, back pressure valve 22, second breather valve 23, fuel recovery tank 24, and pressure relief valve 25 are connected in sequence. The injector 16 is respectively connected to the fuel recovery tank 24 through a second DBB valve 26 and an opening-adjustable valve 27. A P / T sensor 18 is provided inside the fuel pressure measurement chamber 17, and a second hydrocarbon sensor 19 is provided in the pipeline where the fuel pressure measurement chamber 17 is connected to the safety protection valve 20;

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

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

[0011] Preferably, the pipelines connecting the three-way valve 12, the first DBB valve 13 and the first breather valve 14 to the injector 16 adopt double-walled pipes, the pipeline connecting the servo oil control valve 5 to the injector 16 adopts a double-walled pipe, and the pipeline connecting the injector 16 to the fuel recovery tank 24 through the second DBB valve 26 adopts 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 there is a flow-through gap in the middle.

[0013] Preferably, carbon and nitrogen are sucked in the outer pipe 35 and transmitted 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 measurement chamber 17.

[0015] The technical solution of the present invention also provides a servo oil supercharging injector performance test system, which is applied to a servo oil supercharging injector performance test device as described above, and includes:

[0016] The servo oil in the servo oil tank 1 is filtered and pressurized by the servo oil filter 2 and the servo oil pressurizing pump 3 to the target pressure and then stored in the servo oil pressure stabilizing tank 4. The servo oil control valve 5 controls the opening time and injection time of the servo oil pressure stabilizing tank 4, so that the servo oil in the servo oil pressure stabilizing tank 4 is transmitted to the injector;

[0017] The fuel in the fuel tank 6 is filtered and pressurized by the fuel filter 7 and the fuel pressurizing pump 8 to the target pressure and then stored in the fuel pressure stabilizing tank 9. The regulating valve 10, the heat exchanger 11 and the three-way valve 12 jointly adjust the temperature of the fuel from the fuel pressure stabilizing tank 9, and the fuel after adjusting the temperature is transported to the injector 16 through the three-way valve 12, the first DBB valve 13 and the first breather valve 14;

[0018] Close the first DBB valve 13 and open the opening-adjustable valve 27 to purge nitrogen. The fuel is purged into the injector 16 by nitrogen so that the servo oil and the fuel react;

[0019] The waste liquid and waste gas in the injector are recovered to the fuel recovery tank 24 through the second DBB valve 26 and the opening-adjustable valve 27, and the fuel recovery tank 24 is depressurized through the pressure relief valve 25;

[0020] The P / T sensor 18 located inside the fuel pressure measurement chamber 17 acquires pressure and time. Combining the volume of the fuel pressure measurement chamber 17 and the fuel injection volume, the injection rate is obtained by differentiating with respect to time to conduct injection law tests;

[0021] The detection values of the first hydrocarbon sensor 15 and the second hydrocarbon sensor 19 are acquired, and whether there is fuel leakage is judged according to the detection values;

[0022] The liquid flowing out of the fuel pressure measurement chamber 17 flows into the fuel recovery tank 24 through the safety protection valve 20, the pressure regulating valve 21, the back pressure valve 22, and the second ventilation valve 23;

[0023] The pressure and time data of the P / T sensor 18 are transmitted to the charge amplifier 28 via the fuel pressure measurement chamber 17. The data processed by the charge amplifier 28 is transmitted to the data acquisition card 29 and summarized in the computer 31. The computer 31 sends control instructions to the control circuit 30 according to the data, and the control circuit 30 controls the servo oil control valve 5 and the injector 16 according to the control instructions.

[0024] Preferably, the purging pressure of the nitrogen is greater than the supply pressure by 7 bar.

[0025] Preferably, the injection rate formula is:

[0026] △P = K * △V / V

[0027] dP / dt = K * V * dV / dt

[0028] In the formula, △V is the fuel injection volume, V is the volume of the fuel pressure measurement chamber, △P is the pressure rise value of the fuel pressure measurement chamber, and K is the volume elastic modulus of the fuel.

[0029] The present invention provides a servo oil supercharging type injector performance test system and device, which solves the problem that it cannot be applied to the performance tests of various new fuel injection systems, realizes the effective inspection of the injection law and the verification of the system performance, and further provides guarantee for the subsequent development of new fuel engines. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of a servo oil supercharging type injector performance test device provided by the present invention;

[0031] Figure 2 It is a schematic structural diagram of a double-wall tube provided by the present invention;

[0032] Reference Signs:

[0033] Servo oil tank 1, servo oil filter 2, servo oil pressurizing pump 3, servo oil pressure stabilizing tank 4;

[0034] Servo oil control valve 5, fuel tank 6, fuel filter 7, fuel pressurizing pump 8;

[0035] Fuel pressure stabilizing tank 9, regulating valve 10, heat exchanger 11, three-way valve 12, first DBB valve 13;

[0036] First breather valve 14, first hydrocarbon sensor 15, injector 16, fuel pressure measurement chamber 17;

[0037] P / T sensor 18, second hydrocarbon sensor 19, safety protection valve 20, pressure regulating valve 21;

[0038] Back pressure valve 22, second breather valve 23, fuel recovery tank 24, pressure relief valve 25, second DBB valve 26;

[0039] Opening adjustable valve 27, charge amplifier 28, data acquisition card 29, control circuit 30;

[0040] Computer 31, first nitrogen purge inlet 32, second nitrogen purge inlet 33;

[0041] Third nitrogen purge inlet 34, outer pipe 35, inner pipe 36, bushing 37. Specific embodiments

[0042] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0043] The performance test system of the servo oil supercharged injector mainly consists of 5 subsystems, namely the servo oil system, the fuel supply system, the nitrogen purge system, the injection law test system, and the control system. Each component is connected by pipelines or lines: the servo oil system and the fuel supply system are connected to the injector through pipelines; the nitrogen purge system consists of 3 separate nitrogen purge inlets; the injection law test system is directly inserted into the injector; the control system establishes a connection with the injector through data signals and control signals. Adopting a modular design, its main function is to test and obtain the injection law of the fuel injection system and has the ability to preliminarily check the reliability of the nozzle.

[0044] As Figure 1As shown, the overall schematic diagram of the servo oil booster injector performance test system includes five systems: servo oil system, fuel supply system, nitrogen purge system, injection law test system, and control system. The servo oil system mainly includes a servo oil tank 1, a servo oil filter 2, a servo oil pressure pump 3, a servo oil pressure regulating tank 4, and a servo oil control valve 5; the fuel supply system is composed of a fuel tank 6, a fuel filter 7, a fuel pressure pump 8, a fuel pressure regulating 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 through a first DBB valve 13 and a first breathable valve 14, and a first hydrocarbon sensor 15 is installed in the intermediate pipeline; the injection law test system includes a fuel pressure measuring chamber 17, a P / T sensor Sensor 18, second hydrocarbon sensor 19, safety protection valve 20, pressure regulating valve 21, back pressure valve 22, second breathable valve 23, fuel recovery tank 24, pressure relief valve 25, and injector 16 are connected to fuel recovery tank 24 through second DBB valve 26 and adjustable opening valve 27 respectively; control system is composed of charge amplifier 28, data acquisition card 29, control circuit 30, computer 31; nitrogen purge system includes first nitrogen purge inlet 32, second nitrogen purge inlet 33, third nitrogen purge inlet 34.

[0045] In general, there are two routes, servo oil and fuel, which input the pressurized stable pressure fuel into the injector and return it to the recovery tank. The injector is directly inserted into the fuel pressure chamber, connected to the computer through the control circuit and data acquisition card to realize the test, and the whole pipeline is purged with nitrogen.

[0046] 1. Servo oil system:

[0047] After the servo oil tank is filtered by the filter, it is pressurized to the required pressure by the booster pump, and then enters the servo oil pressure-stabilizing tank, and the stable servo oil of the target pressure is delivered to the servo oil control valve and the injector, and the oil is returned through the one-way valve at the outlet. Since the injector is mechanical, the servo oil control valve is used to control the opening time and injection duration of the servo oil.

[0048] 2. Fuel supply system:

[0049] The fuel filtered by the filter is pressurized to the target pressure through a pressure pump and connected to the fuel pressure stabilizing tank. The fuel after the temperature is adjusted by the temperature control system is connected to the injector in the fuel injection system and then returned to the fuel storage tank.

[0050] After the fuel is pressurized by the pump, the temperature will change. In order to obtain the target temperature of the fuel, the temperature needs to be adjusted. The specific operation is as follows: a temperature adjustment system is connected after the pump. The temperature adjustment system consists of two parallel connections, one for heating and one for heat exchange. Each is equipped with a corresponding valve to achieve the heating and cooling of the fuel according to seasonal conditions or needs. Mixed with the fuel adjusted by the temperature adjustment system, the fuel with the appropriate temperature is finally connected to the injector system.

[0051] The injector is directly inserted into the fuel pressure measurement chamber. The injector requires a return flow (the second DBB valve 26) to introduce the waste liquid / gas in the injector into the fuel recovery tank for recovery. A safety protection valve is installed behind the injector, which can be emergently cut off in case of safety problems.

[0052] After passing through the injector, after the pressure regulating valve and the back pressure valve (the back pressure of the back pressure valve is set as required), one end is connected to the fuel recovery tank, and the other end is for ventilation, that is, the gas is vented to the atmosphere. This is because after the nitrogen purges the fuel in the pipeline into the recovery tank, the excess nitrogen in the pipeline can pass through this valve into the atmosphere to release the excess nitrogen. A pressure relief valve needs to be installed on the fuel recovery tank. If the pressure in the tank is too high, the pressure relief is achieved through the pressure relief valve. To prevent the 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 in the tank reaches the opening pressure of the valve, the nitrogen will be squeezed out to ensure that the pressure in the fuel tank always remains within the set safe pressure range.

[0053] Starting from the pipeline entering the injector until the fuel recovery tank, all the pipelines in the middle are set as double-wall pipes. The specific structure of the double-wall pipes is as Figure 2 shown, including an outer pipe 35, an inner pipe 36, and a bushing 37. A bushing 37 is installed at the joint of the pipes, but it does not completely cover, and there is a certain space left in the middle for circulation. In addition, hydrocarbons are sucked in the outer pipe 35 of the two-way double-wall pipes for entering and leaving the injector, and the first hydrocarbon sensor 15 and the second hydrocarbon sensor 19 are connected to detect whether there is fuel leakage.

[0054] 3. Nitrogen purging system:

[0055] The entire pipeline is purged with nitrogen, and the purging pressure is at least 7 bar greater than the supply pressure to ensure that the entire pipeline can be completely purged. The specific operation is as follows:

[0056] On the pipeline after the fuel pressure stabilizing tank, a first nitrogen purging port 33 is set for purging the fuel temperature regulating system. When purging, the first DBB valve 13 is closed, and the ventilation valve is opened to release nitrogen.

[0057] At the front end of the injector, a second nitrogen purging port 34 is set. When purging, the first DBB valve 13 is closed. Since the pipeline of the injector is relatively narrow, in order to ensure the complete purging of the subsequent pipeline, a valve 27 with adjustable opening is set between the injector and the fuel recovery tank, which is only opened during nitrogen purging to ensure that the nitrogen purging the injector can enter the fuel recovery tank.

[0058] At the fuel pressure measurement chamber, a third nitrogen purging port 35 is set to ensure that there is a large enough flow of nitrogen purging to the subsequent pipeline.

[0059] So far, the purging of all pipelines has been completed.

[0060] 4. Injection law test system:

[0061] The specific working principle of the fuel pressure measurement chamber is as follows: Fuel is injected into a closed rigid container filled with fuel, and the pressure rises proportionally to the injection volume. The injection law and injection volume can be calculated based on the pressure curve.

[0062] When the volume of the closed container is V and fuel with an injection volume of ΔV is injected, the volume elastic modulus of the fuel is K, and the pressure rise ΔP in the rigid closed container can be expressed as: ΔP = K * ΔV / V. Taking the derivative with respect to time gives: dP / dt = K * V * dV / dt

[0063] The injection rate can be obtained:

[0064] dV / dt = K * V * dP / dt

[0065] Among them, dP / dt can be obtained by a fast-response pressure sensor.

[0066] 5. Control system:

[0067] The signals of the servo oil control valve and the injector are directly connected to the control circuit, and the fuel pressure measurement chamber is connected to a charge amplifier to obtain data using a data acquisition card.

Claims

1. A servo oil booster injector performance test device, characterized in that: include: The servo oil tank 1, the servo oil filter 2, the servo oil booster pump 3, the servo oil pressure regulating tank 4, and the servo oil control valve 5 are connected in sequence, and the servo oil control valve 5 is connected to the injector 16 through a pipeline; The fuel tank 6, the fuel filter 7, the fuel booster pump 8, the fuel pressure stabilizing tank 9, the regulating valve 10, the heat exchanger 11, the three-way valve 12, the first DBB valve 13, the first breathable valve 14 are connected to the injector 16 through a pipeline, and a first hydrocarbon sensor 15 is provided in the pipeline connecting the first breathable valve 14 and the injector 16; 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 breathable valve 23, the fuel recovery tank 24, and the 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 opening valve 27, respectively. A P / T sensor 18 is provided inside the fuel pressure measuring chamber 17, and a second hydrocarbon sensor 19 is provided in the pipeline connecting the fuel pressure measuring chamber 17 and the safety protection valve 20; The fuel pressure measuring 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, and the control circuit 30 is connected to the servo oil control valve 5 and the injector 16 respectively.

2. A servo oil booster injector performance test device as claimed 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. A servo oil booster injector performance test device as claimed in claim 1, characterized in that: The pipelines connecting the three-way valve 12, the first DBB valve 13 and the first breathable valve 14 to the injector 16 adopt double-walled pipes, the pipeline connecting the servo oil control valve 5 to the injector 16 adopts double-walled pipes, and the pipeline connecting the injector 16 to the fuel recovery tank 24 through the second DBB valve 26 adopts double-walled pipes.

4. A servo oil booster injector performance test device as claimed in claim 3, characterized in that: The double-walled pipe comprises 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 a flow gap is left in the middle.

5. A servo oil booster injector performance test device as claimed in claim 4, characterized in that: Carbon and nitrogen are sucked in the outer pipe 32 and transmitted to the first carbon hydrogen sensor 15 and the second carbon hydrogen sensor 19 .

6. A servo oil booster injector performance test device as claimed 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 .

7. A servo oil booster injector performance test system, applied to a servo oil booster injector performance test device as claimed in claim 1, comprising: The servo oil in the servo oil tank 1 is filtered and pressurized to the target pressure by the servo oil filter 2 and the servo oil booster pump 3, and then stored in the servo oil surge tank 4. The servo oil control valve 5 controls the opening time and injection time of the servo oil surge tank 4, so that the servo oil in the servo oil surge tank 4 is transmitted to the injector. The fuel in the fuel tank 6 is filtered and pressurized to the target pressure by the fuel filter 7 and the fuel booster pump 8 and then stored in the fuel surge tank 9. The regulating valve 10, the heat exchanger 11 and the three-way valve 12 jointly adjust the temperature of the fuel from the fuel surge tank 9. The fuel after the temperature adjustment is delivered to the injector 16 through the three-way valve 12, the first DBB valve 13 and the first breathable valve 14. Close the first DBB valve 13 and open the adjustable valve 27 to purge nitrogen, and use the nitrogen to purge the fuel into the injector 16 so that the servo oil and the fuel react; The waste liquid and waste gas in the injector are recovered to the fuel recovery tank 24 through the second DBB valve 26 and the adjustable opening valve 27, and the fuel recovery tank 24 is depressurized through the pressure relief valve 25; The P / T sensor 18 located inside the fuel pressure measuring chamber 17 obtains pressure and time, and combines the volume of the fuel pressure measuring chamber 17 and the fuel injection volume to obtain the injection rate by taking the derivative with respect to time, so as to perform the injection law test; Obtaining detection values ​​of the first carbon hydride sensor 15 and the second carbon hydride sensor 19, and determining whether there is a fuel leak according to the detection values; The liquid flowing out of the fuel pressure measuring chamber 17 flows into the fuel recovery tank 24 through the safety protection valve 20, the pressure regulating valve 21, the back pressure valve 22, and the second breathable valve 23; The pressure and time data of the P / T sensor 18 are transmitted to the charge amplifier 28 via the fuel pressure measuring chamber 17. The data processed by the charge amplifier 28 are transmitted to the data acquisition card 29 and summarized in the computer 31. The computer 31 sends a control instruction to the control circuit 30 according to the data, and the control circuit 30 controls the servo oil control valve 5 and the injector 16 according to the control instruction.

8. A servo oil booster injector performance test system as claimed in claim 7, characterized in that: The nitrogen purge pressure is 7 bar greater than the supply pressure.

9. A servo oil booster injector performance test system as claimed in claim 7, characterized in that: The injection rate formula is: △P=K*△V / V dP / dt=K*V*dV / dt Wherein, △V is the fuel injection volume, V is the volume of the fuel pressure measuring chamber, △P is the pressure rise value of the fuel pressure measuring chamber, and K is the bulk elastic modulus of the fuel.

Images