Methanol fuel high pressure injection test bench

Abstract

The application discloses a kind of methanol fuel high-pressure injection test bench, including rack, methanol delivery unit, high-pressure injection pump unit, cooling unit, lubricating unit and methanol fuel injection unit, methanol delivery unit input end is connected with methanol fuel storage cabinet, methanol delivery unit output end is connected with high-pressure injection pump unit input end.High-pressure injection pump unit first output end is connected with methanol fuel injection unit input end, second output end is connected with cooling unit input end, and cooling unit output end is connected with methanol fuel storage cabinet.High-pressure injection pump unit includes high-pressure injection pump and cam driving device, and methanol fuel injection unit includes accumulator, two two-position three-way electromagnetic reversing valve and two methanol fuel injectors.The application provides test evidence and theoretical support for troubleshooting cause and solution of methanol fuel system, and provides a solid foundation for the research and development of marine methanol fuel engine.

Description

Technical Field

[0001] This invention relates to a high-pressure common rail test bench for marine engines, and more particularly to a methanol fuel injection test bench, belonging to the field of marine engine testing technology. Background Technology

[0002] As a key core system of marine engines, the fuel system is characterized by high technology density and high added value, placing it at the core of the high-tech shipbuilding supporting industry. Methanol fuel, as an environmentally friendly and clean fuel, has been widely used in marine engines in recent years. Using methanol fuel can alleviate my country's tight oil energy situation and improve the comprehensive utilization of resources. Methanol fuel burns completely, reducing the emission of pollutants and harmful gases, thus protecting the environment. The chemical properties of methanol fuel are more stable at room temperature, which is beneficial for fuel transportation, storage, and use; methanol fuel also has better plasticity and can be effectively modified and its efficiency improved by using various additives.

[0003] However, current research on the use of methanol fuel in marine engine fuel systems is insufficient. In particular, the transient changes in various performance indicators (flow rate, temperature, and pressure) of methanol fuel under high load and variable operating conditions of marine engines have not been thoroughly understood. A high-pressure methanol fuel injection test bench is needed for simulation testing. Summary of the Invention

[0004] The purpose of this invention is to provide a methanol fuel high-pressure injection test bench to simulate the transient changes in various performance indicators (flow rate, temperature, and pressure) of a methanol fuel system under high load, variable operating conditions, and variable load conditions, as well as the working conditions of the high-pressure injection pump and methanol fuel atomization test when the methanol fuel supply changes.

[0005] This invention is achieved through the following technical solution:

[0006] A methanol fuel high-pressure injection test bench includes a frame, a methanol delivery unit mounted on the bottom platform of the frame, a lower part of a high-pressure injection pump unit mounted on the middle platform of the frame, a cooling unit, a lubrication unit, and an upper part of a high-pressure injection pump unit and a methanol fuel injection unit mounted on the top platform of the frame. The input end of the methanol delivery unit is connected to a methanol fuel storage tank outside one end of the frame, and the output end of the methanol delivery unit is connected to the input end of the high-pressure injection pump unit via a connecting pipe. The first output end of the high-pressure injection pump unit is connected to the input end of the methanol fuel injection unit via a high-pressure pipe, and the second output end of the high-pressure injection pump unit is connected to the input end of the cooling unit via a connecting pipe. The output end of the cooling unit is connected to the methanol fuel storage tank via a connecting pipe. The high-pressure injection pump unit includes an upper high-pressure injection pump and a lower cam drive device. The cam drive device includes a drive motor, a camshaft, a rocker arm, and a guide cylinder assembly. The drive motor, supported on one end of the middle platform of the frame, is connected to one end of the camshaft via a coupling. The two ends of the camshaft are respectively supported on the other end of the middle platform of the frame via bearing seats. The other end of the camshaft extends out of the frame and is fixed to a flywheel. Fixed connection; the outer edge of the cam in the middle of the camshaft abuts against the outer edge of the roller at one end of the rocker arm; the upper end of the guide tube assembly is fixed to the lower end of the high-pressure injection pump; the high-pressure injection pump is vertically supported on one end of the upper platform of the frame; the plunger of the high-pressure injection pump extends into the guide tube and is connected to the outer edge of the cam through the roller; the methanol fuel injection unit includes an accumulator, two two-position three-way solenoid directional valves and two methanol fuel injectors; the output end of the high-pressure injection pump is connected to one input end of the accumulator through a high-pressure oil pipe; the other input end of the accumulator is connected to one end of the safety unit; the two output ends of the accumulator... Each valve is connected to the initial closed end of the valve core of the two-position three-way solenoid directional valve. One end of the initial open end of the valve core of the two-position three-way solenoid directional valve is connected to the drain port of the methanol fuel injector. The other end of the initial open end of the valve core of the two-position three-way solenoid directional valve is connected to the return end of the high-pressure injection pump through a check valve and a connecting pipeline, and then to the methanol fuel storage tank through a two-way ball valve and the methanol fuel cooler of the cooling unit. The signal lines of the electronic control unit are connected to the throttle valve of the high-pressure injection pump, the pressure sensor, and the electromagnet of the two-position three-way solenoid directional valve.

[0007] The objectives of this invention can also be further achieved through the following technical measures.

[0008] Furthermore, the methanol delivery unit includes several two-way ball valves, a coarse filter, an electric supply pump, a buffer tank, and a dual filter. The connection pipeline at the input end of the electric supply pump is sequentially connected to the coarse filter, the two-way ball valve, and the methanol fuel storage tank. The connection pipeline at the output end of the electric supply pump is sequentially connected to the input end of the high-pressure injection pump through the two-way ball valve, the buffer tank, and the dual filter. The two-way ball valve connected to the output end of the electric supply pump returns to the methanol fuel storage tank through the connection pipeline.

[0009] Furthermore, the lubrication unit includes a lubricating oil tank outside the other end of the frame, as well as a lubricating oil filter and an electric lubricating oil pump. The lubricating oil pipe at the input end of the electric lubricating oil pump is connected to the lubricating oil tank in sequence through the lubricating oil filter and a two-way ball valve. The lubricating oil pipe at the output end of the electric lubricating oil pump enters the cam box after passing through the two-way ball valve. It sprays lubricating oil onto the roller on the lower side of one end of the rocker arm and the outer edge of the cam in the middle of the cam shaft. The lubricating oil in the cam box returns to the lubricating oil tank in sequence through the two-way ball valve, the lubricating oil cooler, and the two-way ball valve. The cooling pipe of the lubricating oil cooler is connected to the cooling unit.

[0010] Furthermore, the cooling unit includes an ethylene diether cooling tank, a centrifugal circulating pump, a methanol fuel cooler, and a lubricating oil cooler. The ethylene diether cooling pipeline at the input end of the centrifugal circulating pump is connected to the ethylene diether cooling tank via a two-way ball valve. The ethylene diether cooling pipeline at the output end of the centrifugal circulating pump is divided into two paths: one path enters the methanol fuel cooler through the two-way ball valve and then returns to the ethylene diether cooling tank, and the other path enters the lubricating oil cooler and then returns to the ethylene diether cooling tank.

[0011] Furthermore, the security unit includes a two-position two-way pneumatic directional valve and an overflow valve. The closed end of the two-position two-way pneumatic directional valve core in its initial position is connected to the other input end of the accumulator. The overflow valve is connected in parallel with the two-position two-way pneumatic directional valve and then leads to the cooling unit. The parallel connection point is connected to a rail pressure sensor. The signal lines of the electronic control unit are respectively connected to the electromagnet of the two-position two-way pneumatic directional valve and the rail pressure sensor. The high-pressure air source is connected to the control end of the two-position two-way pneumatic directional valve through a high-pressure air pipe and a two-way valve.

[0012] Furthermore, the flow rate of the electric supply pump is Q = 4m³. 3 / h, pressure P = 1.4 MPa. The output pressure of the high-pressure jet pump is 0–150 MPa. The filtration accuracy of the dual filter is 10 μm.

[0013] This invention integrates a methanol delivery unit, a high-pressure injection pump unit, a cooling unit, a lubrication unit, a safety unit, and a methanol fuel injection unit on each working platform, resulting in a compact structure and ease of use. It can be used to investigate key performance parameters of methanol fuel under different loads and operating conditions, as well as the changes and processes of performance indicators such as flow rate, temperature, and pressure. By simulating the operation of each component of the methanol fuel system under different loads and changes in methanol fuel supply, it identifies key technical parameters affecting the normal operation of each component, providing experimental evidence and theoretical support for troubleshooting and developing solutions for methanol fuel systems. This invention can also build simulation models for conducting simulation analysis research on methanol fuel systems, focusing on the impact of changes in key characteristic parameters on key core components of the methanol fuel system. It can also be used to verify and study the reliability of methanol fuel systems and key components, and similarly, it can be used for research on high-pressure common rail electronic injection methanol fuel system technology, mastering the relevant design requirements of common rail system components. This invention provides a solid foundation for the development of marine methanol fuel engines.

[0014] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention;

[0016] Figure 2 yes Figure 1 The right view;

[0017] Figure 3 This is a structural block diagram of the present invention;

[0018] Figure 4 This is a perspective view of the high-pressure jet pump unit of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1-4 As shown, the present invention includes a frame 1, a methanol delivery unit 2 disposed on the bottom platform 11 of the frame, a lower part of a high-pressure injection pump unit 3 disposed on the middle platform 12 of the frame, a cooling unit 4, a lubrication unit 5, and an upper part of the high-pressure injection pump unit 3 and a methanol fuel injection unit 6 disposed on the top platform 13 of the frame.

[0021] The methanol delivery unit 2 includes four two-way ball valves 21, a coarse filter 22, an electric supply pump 23, a buffer tank 24, and a dual filter 25. The connection pipe 26 at the input end of the electric supply pump 23 is connected in sequence to the coarse filter 22, the two-way ball valves 21, and the methanol fuel storage tank 27. The connection pipe 26 at the output end of the electric supply pump 23 is connected in sequence to the input end 31 of the high-pressure injection pump through the two-way ball valves 22, the buffer tank 26, and the dual filter 27. The two-way ball valve 22, which is connected to the output end of the electric supply pump 23, returns to the methanol fuel storage tank 27 through the connection pipe 26 to regulate the output flow of the electric supply pump 23.

[0022] The output of methanol delivery unit 2 is connected to the input of high-pressure injection pump unit 31 via connecting pipe 26. In this embodiment, the flow rate of electric supply pump 23 is Q = 4 m³ / s. 3 / h, pressure P = 1.4 MPa, the filtration accuracy of the dual filter 25 is 10 μm. The buffer tank 24 plays a role in smoothing the pressure fluctuation of the methanol delivery unit 2, ensuring stable methanol fuel delivery.

[0023] like Figure 1 and Figure 4 As shown, the high-pressure injection pump unit 3 includes an upper high-pressure injection pump 34 and a lower cam drive device 35. The cam drive device 35 includes a drive motor 351, a camshaft 352, a rocker arm 353, and a guide cylinder assembly 354. The drive motor 351, supported on one end of the middle platform 12 of the frame, is connected to the left end of the camshaft 352 via a coupling 355. Both ends of the camshaft 352 are supported on the right end of the middle platform 12 of the frame via bearing seats 356. The right end of the camshaft 352 extends out of the frame 1 and is fixedly connected to the flywheel 357 to store excess energy from the rotation of the camshaft 352. The outer edge of the cam 358 in the middle of the camshaft 352 abuts against the outer edge of the roller 359 at the left end of the rocker arm 353. The upper end of the guide cylinder 3541 of the guide cylinder assembly 354 is fixed to the lower end of the high-pressure injection pump 34. The high-pressure injection pump 34 is vertically supported on the right end of the upper platform 13 of the frame. The high-pressure injection pump plunger 341 extends into the guide tube and connects to the outer edge of the cam 358 via roller 3531. The first output end 32 of the high-pressure injection pump unit is connected to the first input end 611 of the methanol fuel injection unit via high-pressure pipeline 8. The second output end 33 of the high-pressure injection pump unit is connected to the input end 431 of the cooling unit via connecting pipeline 26. The output end 432 of the cooling unit is connected to the methanol fuel storage tank 27 via connecting pipeline 26. The output pressure of the high-pressure injection pump 34 is 0-150 MPa.

[0024] Cooling unit 4 includes an ethylene diether cooling tank 41, a centrifugal circulating pump 42, a methanol fuel cooler 43, and a lubricating oil cooler 44. The ethylene diether cooling pipe 45 at the input end of the centrifugal circulating pump 42 is connected to the ethylene diether cooling tank 41 through a two-way ball valve 21. The ethylene diether cooling pipe 45 at the output end of the centrifugal circulating pump 42 is divided into two paths. One path enters the methanol fuel cooler 43 through the two-way ball valve 21 and then returns to the ethylene diether cooling tank 41. The other path enters the lubricating oil cooler 44 and then returns to the ethylene diether cooling tank 41.

[0025] Lubrication unit 5 includes Figure 1 The lubricating oil tank 51 is located on the right side of the middle frame 1, along with the lubricating oil filter 52 and the electric lubricating oil pump 53. The lubricating oil pipe 54 at the input end of the electric lubricating oil pump 53 is connected to the lubricating oil tank 51 via the lubricating oil filter 52 and a two-way ball valve 21. The lubricating oil pipe 54 at the output end of the electric lubricating oil pump 53 enters the cam box 360 after passing through the two-way ball valve 21. It sprays lubricates the roller 359 on the lower side of one end of the rocker arm 353 and the outer edge of the cam 358 in the middle of the cam shaft 352. The lubricating oil in the cam box 360 returns to the lubricating oil tank 51 via the two-way ball valve 21, the lubricating oil cooler 44, and the two-way ball valve 21. The cooling pipe 45 of the lubricating oil cooler 52 is connected to the cooling unit 4.

[0026] The methanol fuel injection unit 6 includes an accumulator 61, two two-position three-way solenoid directional valves 62, and two methanol fuel injectors 63. The output of the high-pressure injection pump 34 is connected to the high-pressure fuel line 8. Figure 3 The left input terminal 611 of the accumulator 61 is connected, and the output terminal of the accumulator 61 is connected to the initial closed terminal 621 of the valve core of the two-position three-way solenoid directional valve 62. One end of the initial open terminal 622 of the valve core of the two-position three-way solenoid directional valve 62 is connected to the drain port 631 of the methanol fuel injector 63. The other end of the initial open terminal 622 of the valve core of the two-position three-way solenoid directional valve 62 is connected to the return terminal 33 of the high-pressure injection pump through the check valve 64 and the drain line 65 in sequence. Then, it flows into the methanol fuel storage tank 27 through the two-way ball valve 21 and the methanol fuel cooler 43 of the cooling unit 4 in sequence, so that the high-pressure oil flowing through the two-position three-way solenoid directional valve 62 is fully cooled. In addition to storing the 150Mpa ultra-high pressure methanol fuel input by the high-pressure injection pump 34, the accumulator 61 can also eliminate the pressure fluctuation of the ultra-high pressure methanol fuel before inputting it into the methanol fuel injector 63 to complete the methanol fuel injection test.

[0027] Safety unit 7 includes a two-position two-way pneumatic directional valve 71 and an overflow valve 72. The initial closed position 711 of the two-position two-way pneumatic directional valve spool is connected to the left input terminal 612 of the accumulator 61. The overflow valve 72 is connected in parallel with the two-position two-way pneumatic directional valve 71 and then leads to the cooling unit 4. The parallel connection point is connected to the pressure sensor 73. The high-pressure air source 74 leads to the control terminal of the two-position two-way pneumatic directional valve 71 through the high-pressure air pipe 741 and the two-way valve 21. The signal line 91 of the electronic control unit 9 is connected to the throttle valve 341 of the high-pressure jet pump 34, the electromagnet of the two-position three-way solenoid directional valve 62, and the pressure sensor 73, respectively.

[0028] When the pressure sensor 73 detects an abnormal methanol fuel pressure or an emergency shutdown is required, the electronic control unit 9 issues a command to start the high-pressure gas source 74 to output 5 MPa high-pressure gas to push the two-position two-way pneumatic reversing valve 71 to switch. The valve core moves to the right to the left position to connect the accumulator 61. The high-pressure methanol fuel in the accumulator 61 is quickly released into the methanol fuel storage tank 27 through the two-position two-way pneumatic reversing valve 71 and the methanol fuel cooler 43 in sequence, ensuring the safety of the marine engine.

[0029] This invention can complete the following experimental processes:

[0030] 1) Simulate the variable load process of a marine engine. By adjusting the throttle valve 341 of the high-pressure injection pump 34 to change the methanol fuel injection quantity, a simulation test of the 75-100% variable operating condition process of a marine engine is conducted to verify the stability of the operation of each component and to monitor the fuel supply flow rate, temperature, and pressure.

[0031] 2) Simulate the rail pressure change process of a marine engine at 80% and 90% load. By adjusting the output pressure of the high-pressure injection pump 34, the rail pressure is increased from 140 MPa to 165 MPa. Different rail pressure change rates are set: 2 MPa / s and 5 MPa / s. The stability of each component is verified, and the flow rate, temperature and pressure are monitored.

[0032] 3) Simulate the reliability of each component's operation when the methanol delivery unit 2 delivers methanol fuel, whether it passes through the buffer tank 24 or not, and monitor the flow rate, temperature, and pressure.

[0033] 4) Simulate a change in the methanol fuel supply, with the flow rate changing from 1.5m³ / h. 3 / h changed to 4m 3 The reliability of each component under 80% and 90% load was measured per hour. Flow rate, temperature, and pressure were also monitored.

[0034] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A methanol fuel high-pressure injection test bench, characterized in that, The system includes a frame, a methanol delivery unit mounted on the bottom platform of the frame, a lower part of a high-pressure injection pump unit mounted on the middle platform of the frame, a cooling unit, a lubrication unit, and an upper part of a high-pressure injection pump unit and a methanol fuel injection unit mounted on the top platform of the frame. The input end of the methanol delivery unit is connected to a methanol fuel storage tank outside one end of the frame. The output end of the methanol delivery unit is connected to the input end of the high-pressure injection pump unit via a connecting pipe. The first output end of the high-pressure injection pump unit is connected to the input end of the methanol fuel injection unit via a high-pressure pipe. The second output end of the high-pressure injection pump unit is connected to the input end of the cooling unit via a connecting pipe. The output end of the cooling unit is connected to the methanol fuel storage tank via a connecting pipe. The high-pressure injection pump unit includes an upper high-pressure injection pump and a lower cam drive device. The cam drive device includes a drive motor, a camshaft, a rocker arm, and a guide cylinder assembly. The drive motor, supported on one end of the middle platform of the frame, is connected to one end of the camshaft via a coupling. Both ends of the camshaft are supported on the other end of the middle platform of the frame via bearing seats. The other end of the camshaft extends out of the frame and is fixedly connected to a flywheel. The outer edge of the cam in the middle abuts against the outer edge of the roller at one end of the rocker arm. The upper end of the guide tube assembly is fixed to the lower end of the high-pressure injection pump. The high-pressure injection pump is vertically supported on one end of the upper platform of the frame. The plunger of the high-pressure injection pump extends into the guide tube and connects to the outer edge of the cam through the roller. The methanol fuel injection unit includes an accumulator, two two-position three-way solenoid directional valves, and two methanol fuel injectors. The output end of the high-pressure injection pump is connected to one input end of the accumulator through a high-pressure oil pipe. The other input end of the accumulator is connected to one end of the safety unit. The two output ends of the accumulator are respectively connected to two... The initial closed end of the valve core of the two-position three-way solenoid directional valve is connected to the valve core. One end of the open end of the initial position of the valve core of the two-position three-way solenoid directional valve is connected to the oil drain port of the methanol fuel injector. The other end of the open end of the initial position of the valve core of the two-position three-way solenoid directional valve is connected to the return end of the high-pressure injection pump through a check valve and a connecting pipeline in sequence, and then to the methanol fuel storage tank through a two-way ball valve and the methanol fuel cooler of the cooling unit in sequence. The signal lines of the electronic control unit are connected to the throttle valve of the high-pressure injection pump, the pressure sensor, and the electromagnet of the two-position three-way solenoid directional valve in sequence.

2. The methanol fuel high-pressure injection test bench as described in claim 1, characterized in that, The methanol delivery unit includes several two-way ball valves, a coarse filter, an electric supply pump, a buffer tank, and a dual filter. The connection pipeline at the input end of the electric supply pump is connected in sequence to the coarse filter, the two-way ball valve, and the methanol fuel storage tank. The connection pipeline at the output end of the electric supply pump is connected in sequence to the input end of the high-pressure injection pump through the two-way ball valve, the buffer tank, and the dual filter. The two-way ball valve connected to the output end of the electric supply pump returns to the methanol fuel storage tank through the connection pipeline.

3. The methanol fuel high-pressure injection test bench as described in claim 1, characterized in that, The lubrication unit includes a lubricating oil tank located at the other end of the frame, as well as a lubricating oil filter and an electric lubricating oil pump. The lubricating oil pipe at the input end of the electric lubricating oil pump is connected to the lubricating oil tank in sequence through the lubricating oil filter and a two-way ball valve. The lubricating oil pipe at the output end of the electric lubricating oil pump enters the cam box after passing through the two-way ball valve. The lubricating oil is sprayed to lubricate the roller on the lower side of one end of the rocker arm and the outer edge of the cam in the middle of the cam shaft. The lubricating oil in the cam box returns to the lubricating oil tank in sequence through the two-way ball valve, the lubricating oil cooler, and the two-way ball valve. The cooling pipe of the lubricating oil cooler is connected to the cooling unit.

4. The methanol fuel high-pressure injection test bench as described in claim 3, characterized in that, The cooling unit includes an ethylene diether cooling tank, a centrifugal circulating pump, a methanol fuel cooler, and a lubricating oil cooler. The ethylene diether cooling pipeline at the input end of the centrifugal circulating pump is connected to the ethylene diether cooling tank via a two-way ball valve. The ethylene diether cooling pipeline at the output end of the centrifugal circulating pump is divided into two paths: one path enters the methanol fuel cooler through the two-way ball valve and then returns to the ethylene diether cooling tank, and the other path enters the lubricating oil cooler and then returns to the ethylene diether cooling tank.

5. The methanol fuel high-pressure injection test bench as described in claim 1, characterized in that, The safety unit includes a two-position two-way pneumatic directional valve and an overflow valve. The closed end of the valve core of the two-position two-way pneumatic directional valve is connected to the other input end of the accumulator. The overflow valve is connected in parallel with the two-position two-way pneumatic directional valve and then leads to the cooling unit. The parallel connection point is connected to a pressure sensor. The high-pressure air source is connected to the control end of the two-position two-way pneumatic directional valve through a high-pressure air pipe and a two-way valve. The signal lines of the electronic control unit are connected to the electromagnet of the two-position two-way pneumatic directional valve and the pressure sensor, respectively.

6. The methanol fuel high-pressure injection test bench as described in claim 2, characterized in that, The electric supply pump has a flow rate Q = 4 m³ / h and a pressure P = 1.4 MPa.

7. The methanol fuel high-pressure injection test bench as described in claim 1, characterized in that, The output pressure of the high-pressure jet pump is 0~150Mpa.

8. The methanol fuel high-pressure injection test bench as described in claim 2, characterized in that, The filtration accuracy of the dual filter is 10μm.

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