Methanol fuel discharge flushing system of injection valve injection quantity measurement test bed

Abstract

The utility model discloses a methanol fuel discharging and flushing system of an injection valve injection quantity measurement test bench. The methanol fuel discharging and flushing system comprises a tested piece module used for installing a methanol fuel injector; the servo oil supply module is used for providing servo oil for the methanol fuel injector; the injection quantity measuring module is used for monitoring the injection quantity of the methanol fuel injector; the methanol discharging and flushing module is used for flushing the methanol fuel in the pipeline; the fuel storage and pumping circulation module is used for conveying methanol fuel or a flushing medium to the methanol fuel injector, the injection quantity measuring module and the methanol discharge flushing module; and the electric control system is used for controlling each electric device. According to the utility model, specific discharge flushing strategies are formulated according to different test nodes, so that the use safety of the test bed is ensured; according to the utility model, the high efficiency of the test can be ensured through a targeted discharging and flushing strategy.

Description

Technical Field

[0001] The utility model relates to a methanol discharge and flushing system of a test bench which meets the injection amount measurement requirements of an injection valve, and specifically relates to a fuel injection amount measuring device for a reciprocating power machinery, belonging to the technical field of power machinery, especially to the application field of high-power two-stroke marine engines. Background Art

[0002] As the IMO International Maritime Organization pays more and more attention to ship carbon emissions, mandatory regulations will be issued in the future to limit and restrict ship carbon emissions. Therefore, seeking zero-carbon and low-carbon alternatives to traditional fossil fuels has become a very critical and effective way to solve ship carbon emissions. At present, various new fuels such as methanol, ammonia, hydrogen, dimethyl ether, etc. have been technically proven to be used for reciprocating internal combustion engine combustion, that is, they can replace traditional diesel fuel for engine use, and according to the type of fuel, the carbon emissions of ships can be reduced to varying degrees. However, unlike traditional diesel fuel, the above-mentioned new fuels are flammable, explosive, toxic, corrosive, and volatile. This requires the fuel injection measurement test bench to be specifically designed in terms of fuel supply, fuel discharge, and environmental safety monitoring. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a methanol discharge and flushing system for flushing an injection valve injection quantity measurement test bench.

[0004] In order to solve the above problems, the utility model provides a methanol fuel discharge and flushing system for an injection valve injection quantity measurement test bench, which comprises:

[0005] DUT module for mounting methanol fuel injectors;

[0006] a servo oil supply module for supplying servo oil to methanol fuel injectors;

[0007] An injection quantity measurement module for monitoring the injection quantity of a methanol fuel injector;

[0008] A methanol discharge flushing module for flushing methanol fuel in the pipeline;

[0009] A fuel storage and pumping circulation module for delivering methanol fuel or flushing medium to a methanol fuel injector, an injection quantity measurement module, and a methanol discharge flushing module;

[0010] An electronic control system used to control various electrical components.

[0011] Preferably, the test piece module includes a test bench for fixing a methanol fuel injector, the inlet end of the methanol fuel injector is connected to the low-pressure chamber of the booster piston, and the booster chamber of the booster piston is connected to the servo oil supply module; the low-pressure chamber of the booster piston is also connected in sequence to the electronically controlled switch valve 1, the electronically controlled switch valve 3, and the return oil pipeline to form a loop.

[0012] More preferably, the servo oil supply module comprises a test medium storage tank for storing the servo oil and a pumping device for pumping the servo oil to the booster piston.

[0013] Furthermore, a filter 2 is provided at the outlet end of the pumping device 1; the pumping device 1 is connected to the booster piston through a two-position three-way valve, and another port of the two-position three-way valve is connected to a test medium storage tank 1 to form a loop.

[0014] More preferably, the methanol discharge and flushing module includes a test medium storage tank three for storing the injection material generated by the methanol fuel injector and a test medium storage tank four for storing the flushing medium. The test medium storage tank three is connected to the outlet end of the injection quantity measurement module, and the test medium storage tank four is connected to the low-pressure chamber of the boost piston through the fuel storage and pumping circulation module.

[0015] Furthermore, the injection quantity measuring module includes an injection quantity metering device and a back pressure regulating device for regulating the injection pressure.

[0016] Furthermore, the outlet end of the injection quantity measuring module is connected to the test medium storage tank three through the electric control switch valve two, the pressure transmitter and the liquid level switch in sequence; the pressure transmitter is used to monitor the pressure of the injection material and send a signal to the electronic control system when the pressure value is lower than the set limit; the horizontal position of the test medium storage tank three is lower than the injection quantity measuring module, and the injection material enters the test medium storage tank three under the action of gravity; the liquid level switch is used to monitor the liquid level of the injection material, and send a signal to the electronic control system when the liquid level of the injection material is lower than the set limit.

[0017] Furthermore, the fuel storage and pumping circulation module includes a test medium storage tank 2, a test medium storage tank 3 is connected to the test medium storage tank 2 through a pumping device 2, the pumping device 2 is used to deliver the injection material or flushing medium in the test medium storage tank 3 into the test medium storage tank 2, the test medium storage tank 4 and the test medium storage tank 2 are connected to the inlet end of the pumping device 3 through a three-way valve 2, and the outlet end of the pumping device 3 is connected to the return oil pipeline; the outlet end of the injection quantity measurement module is also connected to the three-way valve 1 through the cooler 2, and the other two ports of the three-way valve 1 are respectively connected to the test medium storage tank 2 and the test medium storage tank 4.

[0018] More preferably, a heater, a cooler 1, and a filter 1 are sequentially arranged on the oil return pipeline.

[0019] Preferably, the methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench also includes a security system.

[0020] Compared with the prior art, the beneficial effects of the utility model are: 1) formulating specific discharge and flushing strategies for different test nodes to ensure the safety of the test bench; 2) ensuring high efficiency of the test through targeted discharge and flushing strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the methanol fuel discharge and flushing system provided by the utility model. DETAILED DESCRIPTION

[0022] In order to make the present invention more obvious and easy to understand, preferred embodiments are described in detail as follows in conjunction with the accompanying drawings.

[0023] Example

[0024] like Figure 1 As shown, a methanol fuel discharge and flushing system of an injection valve injection quantity measurement test bench provided by the utility model comprises:

[0025] A test piece module 27 for installing a methanol fuel injector 6;

[0026] A servo oil supply module 1 for providing servo oil to a methanol fuel injector 6;

[0027] An injection amount measuring module 8 for monitoring the injection amount of the methanol fuel injector 6;

[0028] A methanol discharge flushing module 16 for flushing methanol fuel in the pipeline;

[0029] A fuel storage and pumping circulation module 26 for delivering methanol fuel or flushing medium to the methanol fuel injector 6, the injection amount measurement module 8, and the methanol discharge flushing module 16;

[0030] An electric control system 18 for controlling various electric components;

[0031] Security system32.

[0032] The test piece module 27 includes a test bench 7 for fixing a methanol fuel injector 6, the inlet end of the methanol fuel injector 6 is connected to the low-pressure chamber of the booster piston 4, and the booster chamber of the booster piston 4 is connected to the servo oil supply module 1; the low-pressure chamber of the booster piston 4 is also connected in sequence to the electric control switch valve 1 5, the electric control switch valve 3 20, and the return oil pipeline to form a loop.

[0033] The servo oil supply module 1 includes a test medium storage tank 13 for storing servo oil and a pumping device 12 for pumping the servo oil to the booster piston 4. A filter 231 is provided at the outlet end of the pumping device 12; the pumping device 12 is connected to the booster piston 4 through a two-position three-way valve 28, and the other port of the two-position three-way valve 28 is connected to the test medium storage tank 13 to form a loop.

[0034] The methanol discharge and flushing module 16 includes a test medium storage tank three 14 for storing the injection material generated by the methanol fuel injector 6 and a test medium storage tank four 15 for storing the flushing medium (pure water). The test medium storage tank three 14 is connected to the outlet end of the injection quantity measurement module 8, and the test medium storage tank four 15 is connected to the low-pressure chamber of the booster piston 4 through the fuel storage and pumping circulation module 26.

[0035] The injection quantity measurement module 8 includes an injection quantity metering device 9 and a back pressure regulating device 10 for regulating the injection pressure. The outlet end of the injection quantity measurement module 8 is connected to the test medium storage tank 3 14 through the electric control switch valve 2 11, the pressure transmitter 29, and the liquid level switch 30 in sequence; the pressure transmitter 29 is used to monitor the pressure of the injection material and send a signal to the electric control system 18 when the pressure value is lower than the set limit; the horizontal position of the test medium storage tank 3 14 is lower than the injection quantity measurement module 8, and the injection material enters the test medium storage tank 3 14 under the action of gravity. The liquid level switch 30 is used to monitor the liquid level of the injection material and send a signal to the electric control system 18 when the liquid level of the injection material is lower than the set limit. The electric control system 18 controls the electric control switch valve 1 5, the electric control switch valve 2 11, and the electric control switch valve 3 20 to cut off the power when receiving the pressure signal lower than the set limit sent by the pressure transmitter 29 or the signal that the liquid level of the injection material is lower than the set limit sent by the liquid level switch 30.

[0036] The fuel storage and pumping circulation module 26 includes a test medium storage tank 2 13, and a test medium storage tank 3 14 is connected to the test medium storage tank 2 13 through a pumping device 2 17. The pumping device 2 17 is used to send the injection material or flushing medium in the test medium storage tank 3 14 into the test medium storage tank 2 13. The test medium storage tank 4 15 and the test medium storage tank 2 13 are connected to the inlet end of the pumping device 3 21 through a three-way valve 2 19. The outlet end of the pumping device 3 21 is also connected to the low-pressure chamber of the booster piston 4 through a return oil pipeline. A heater 22, a cooler 23, and a filter 24 are sequentially arranged along the fluid direction of the return oil pipeline; the outlet end of the injection quantity measurement module 8 is also connected to the three-way valve 12 through a cooler 25, and the other two ports of the three-way valve 12 are respectively connected to the test medium storage tank 2 13 and the test medium storage tank 4 15.

[0037] The implementation of the above system is as follows:

[0038] On the test bench 7, a methanol fuel injector 6 is placed;

[0039] The pumping device 3 21 is electrically started, and the methanol fuel enters the low-pressure chamber of the booster piston 4 from the test medium storage tank 2 13 through the three-way valve 2 19, the heater 22, the cooler 1 23, and the filter 1;

[0040] The pumping device 2 is electrically started, and the high-pressure servo oil (pressure is usually 250-450 bar) is supplied from the test medium storage tank 3 through the filter 2 31 to the two-position three-way valve 28;

[0041] When the methanol fuel injection valve needs to perform injection, the two-position three-way valve 28 is energized and the valve core position is switched, and the high-pressure servo oil enters the boosting chamber of the boosting piston 4. Under the effect of the boosting ratio, the methanol fuel in the low-pressure chamber is pressurized to 600-700 bar and enters the methanol fuel injector 6 through the fuel delivery pipe. The high-pressure fuel overcomes the return spring force to achieve injection;

[0042] When the fuel injection valve needs to end the injection action, the two-position three-way valve 28 is powered off and the valve core is reset, the servo oil in the boost piston 4 flows back to the test medium storage tank 3, the boost action is stopped, and the spring in the methanol fuel injector 6 is reset to end the injection;

[0043] The methanol fuel is sprayed into the injection quantity metering device 9. After metering, the fuel passes through the back pressure regulating device 10, the cooler 25, the three-way valve 12, and then flows back to the test medium storage tank 2 13.

[0044] When the test bench needs to be shut down for a short time, a short-time pressure relief strategy is implemented:

[0045] After the test bench is shut down, methanol fuel is still filled in the pipeline due to reasons such as pipeline closure and flow resistance of components, and most pipelines still maintain a high pressure. At this time, the electric control switch valve 15, the electric control switch valve 211, and the electric control switch valve 320 are energized, and the methanol fuel in the pipeline is discharged into the test medium storage box 314 through the corresponding discharge pipeline for storing the discharged methanol fuel. The methanol fuel in the test medium storage box 314 is pumped into the test medium storage box 213 through the pumping device 217. During the discharge process, the pressure value of the pressure transmitter 29 is monitored. When the pressure value is lower than the limit value, the electric control switch valve 15, the electric control switch valve 211, and the electric control switch valve 320 are powered off to end the discharge operation. By releasing the positive pressure of the methanol pipeline, the risk of methanol fuel leakage in the test bench pipeline is significantly reduced. At this time, the methanol fuel still fills the pipeline, which can ensure that the measurement work can be carried out again in a short time after the start-up. During and after the test, the security system 32 should always maintain environmental safety monitoring. The security system includes monitoring equipment, security electronic control system, monitoring of combustible gas concentration, flame detection equipment, etc. This is existing technology and will not be elaborated here.

[0046] When the test bench needs to be shut down for a long time, implement the overall flushing strategy:

[0047] After the test bench is shut down, the electric control switch valve 15, the electric control switch valve 211, and the electric control switch valve 320 are energized, and the methanol fuel in the pipeline is discharged into the test medium storage tank 314 through the corresponding discharge pipeline. The methanol fuel in the test medium storage tank 314 is pumped into the test medium storage tank 213 through the pumping device 217. All methanol pipelines are arranged at an angle, and under the effect of the height difference, most of the methanol fuel is discharged into the test medium storage tank 314. During the discharge process, the liquid level switch 30 arranged in the lowest position pipeline is monitored. After it shows that the methanol fuel in this pipeline is emptied, the electric control switch valve 15, the electric control switch valve 211, and the electric control switch valve 320 are de-energized to end the discharge operation. Add pure water to the test medium storage tank 4 15, switch the three-way valve 2 19 and the three-way valve 1 12, ensure that the pumping device 3 21 sucks the pure water in the test medium storage tank 4 15, and the test medium flowing out of the cooler 2 25 flows into the test medium storage tank 4 15, and flushes through a certain period of working cycle until the methanol fuel concentration in the pipeline is lower than the limit value. Finally, repeat the discharge operation until the monitoring shows that the test medium at the liquid level switch 30 is empty.

[0048] After the pure water circulates from the test medium storage tank four 15 through the pumping device three 21, it returns to the test medium storage tank four 15. Before that, the three-way valve one 12 and the three-way valve two 19 must be switched (the pure water will not enter the test medium storage tank two 13 and the test medium storage tank three 14).

[0049] The present invention can also clean the test medium storage tank 2 13: the methanol medium in the test medium storage tank 2 13 is emptied and transported away, the pure water from the test medium storage tank 4 15 is circulated through the pumping device 3 21 and then returns to the test medium storage tank 2 13, and then the methanol / water mixture in the test medium storage tank 2 13 is emptied and transported away, and before that, only the three-way valve 2 19 is switched.

Claims

1. A methanol fuel discharge and flushing system for an injection valve injection quantity measurement test bench, characterized in that: include: A test piece module (27) for installing a methanol fuel injector (6); A servo oil supply module (1) for supplying servo oil to a methanol fuel injector (6); An injection quantity measuring module (8) for monitoring the injection quantity of a methanol fuel injector (6); A methanol discharge flushing module (16) for flushing methanol fuel in a pipeline; A fuel storage and pumping circulation module (26) for conveying methanol fuel or flushing medium to a methanol fuel injector (6), an injection quantity measuring module (8), and a methanol discharge flushing module (16); An electric control system (18) for controlling various electric components.

2. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that: The test piece module (27) comprises a test bench (7) for fixing a methanol fuel injector (6); the inlet end of the methanol fuel injector (6) is connected to the low-pressure chamber of the booster piston (4); the booster chamber of the booster piston (4) is connected to the servo oil supply module (1); the low-pressure chamber of the booster piston (4) is also connected in sequence to an electric control switch valve 1 (5), an electric control switch valve 3 (20), and an oil return pipeline to form a loop.

3. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 2, characterized in that: The servo oil supply module (1) comprises a test medium storage box (3) for storing servo oil and a pumping device (2) for pumping the servo oil to a booster piston (4).

4. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 3, characterized in that: The outlet end of the pumping device 1 (2) is provided with a filter 2 (31); the pumping device 1 (2) is connected to the booster piston (4) through a two-position three-way valve (28), and the other port of the two-position three-way valve (28) is connected to the test medium storage tank 1 (3) to form a loop.

5. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 2, characterized in that: The methanol discharge and flushing module (16) comprises a test medium storage tank three (14) for storing injection material generated by the methanol fuel injector (6) and a test medium storage tank four (15) for storing flushing medium. The test medium storage tank three (14) is connected to the outlet end of the injection quantity measurement module (8), and the test medium storage tank four (15) is connected to the low-pressure chamber of the booster piston (4) through the fuel storage and pumping circulation module (26).

6. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 5, characterized in that: The injection quantity measuring module (8) comprises an injection quantity metering device (9) and a back pressure regulating device (10) for regulating the injection pressure.

7. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 6, characterized in that: The outlet end of the injection quantity measuring module (8) is connected to the test medium storage tank three (14) through the electric control switch valve two (11), the pressure transmitter (29), and the liquid level switch (30) in sequence; the pressure transmitter (29) is used to monitor the pressure of the injection material and send a signal to the electric control system (18) when the pressure value is lower than the set limit; the horizontal position of the test medium storage tank three (14) is lower than the injection quantity measuring module (8), and the injection material enters the test medium storage tank three (14) under the action of gravity; the liquid level switch (30) is used to monitor the liquid level of the injection material and send a signal to the electric control system (18) when the liquid level of the injection material is lower than the set limit.

8. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 6, characterized in that: The fuel storage and pumping circulation module (26) comprises a test medium storage tank 2 (13), a test medium storage tank 3 (14) is connected to the test medium storage tank 2 (13) through a pumping device 2 (17), the pumping device 2 (17) is used to send the injection material or flushing medium in the test medium storage tank 3 (14) into the test medium storage tank 2 (13), the test medium storage tank 4 (15) and the test medium storage tank 2 (13) are connected to the inlet end of the pumping device 3 (21) through a three-way valve 2 (19), and the outlet end of the pumping device 3 (21) is connected to the return oil pipeline; the outlet end of the injection quantity measurement module (8) is also connected to the three-way valve 1 (12) through a cooler 2 (25), and the other two ports of the three-way valve 1 (12) are respectively connected to the test medium storage tank 2 (13) and the test medium storage tank 4 (15).

9. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 2 or 8, characterized in that: The oil return pipeline is provided with a heater (22), a cooler (23), and a filter (24) in sequence.

10. The methanol fuel discharge and flushing system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that: A security system (32) is also included.

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