An electric fuel high-pressure common rail fuel supply unit

Abstract

The present application belongs to the technical field of manufacturing electric-driven fuel high-pressure common rail oil supply equipment for laboratory use, specifically an electric-driven fuel high-pressure common rail oil supply unit, including a lower fuel tank, an upper fuel tank, and an electrical module. The upper fuel tank is located above the lower fuel tank, and the lower fuel tank and the upper fuel tank are connected through a first oil pump. The bottom of the upper fuel tank is connected to the output end of the first oil pump, and the top of the lower fuel tank is connected to the input end of the first oil pump. The lower fuel tank is provided with a first oil inlet pipe and a second oil inlet pipe, and the first oil inlet pipe is provided with a return oil butterfly valve. The top of the upper fuel tank is connected to the input end of the second oil pump, and the output end of the second oil pump is connected to two electric-driven fuel pumps, which solves the problem that the current high-pressure common rail fuel injection system is not suitable for laboratories due to its large size and the use of an internal combustion engine to drive it.

Description

Technical Field

[0001] The present application belongs to the technical field of manufacturing electric-driven fuel high-pressure common rail oil supply equipment for laboratory use, and specifically relates to an electric-driven fuel high-pressure common rail oil supply unit. Background Art

[0002] A high-pressure common rail fuel injection system consists of a fuel tank, a fuel transfer pump, a fuel filter, a fuel-water separator, high- and low-pressure fuel lines, a high-pressure fuel pump, a common rail assembly with a pressure regulating valve, high-speed solenoid injectors, a preheating device, various sensors, an electronic control unit, and other devices. The low-pressure fuel supply portion of the common rail fuel injection system includes the fuel tank, fuel transfer pump, fuel filter, low-pressure fuel line, and return line. The high-pressure fuel supply portion of the common rail injection system includes the high-pressure fuel pump with a pressure regulating valve, the common rail assembly (with a common rail pressure sensor), and solenoid injectors. However, for low-speed marine diesel engines, the high-pressure common rail system provides high-pressure, high-flow fuel within an adjustable pressure and flow range. However, current common rail fuel injection systems are bulky and driven by internal combustion engines, making them unsuitable for laboratory use. Therefore, a new electrically driven common rail fuel supply unit is needed for experimental research on fuel injection characteristics in a laboratory environment. Summary of the Invention

[0003] The purpose of this application is to address the shortcomings of the existing technology. By adopting an electric fuel pump in combination with an upper fuel tank and a lower fuel tank, an electric fuel high-pressure common rail fuel supply unit is designed for experimental research on fuel injection characteristics in a laboratory environment. The unit realizes the function of providing high-pressure and large-flow fuel to the high-pressure common rail fuel of a low-speed marine diesel engine, and the fuel pressure range and flow range are adjustable. This solves the problem that the current high-pressure common rail fuel injection system is not suitable for laboratories due to its large size and the use of an internal combustion engine drive.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] An electric-driven fuel high-pressure common rail oil supply unit comprises a lower fuel tank, an upper fuel tank, and an electrical module, wherein the upper fuel tank is located above the lower fuel tank, the lower fuel tank and the upper fuel tank are connected via a first fuel pump, the bottom of the upper fuel tank is connected to the output end of the first fuel pump via a first filter, the top of the lower fuel tank is connected to the input end of the first fuel pump via a second filter, the lower fuel tank is provided with a first fuel inlet pipe and a second fuel inlet pipe, the first fuel inlet pipe is provided with an oil return butterfly valve, the top of the upper fuel tank is connected to the input end of the second fuel pump via a third filter, the output end of the second fuel pump is connected to two electric-driven fuel pumps, and the two The output ends of the electric fuel pumps are commonly connected to a two-oil-circuit integrated block. Liquid level gauges are provided in the upper fuel tank and the lower fuel tank. A cooling system and a temperature sensor are provided on the upper fuel tank. A first liquid pressure sensor is provided at the output end of the first fuel pump, the output end of the second fuel pump, and each oil outlet of the two oil-circuit integrated blocks. The first liquid pressure sensor, the liquid level gauge, and the temperature sensor are respectively connected to the input end of the electrical module for signals. The output end of the electrical module is respectively connected to the first fuel pump, the second fuel pump, the two oil-circuit integrated blocks, the oil return butterfly valve, and the cooling system for signals. The top wall of the lower fuel tank and the upper fuel tank are both provided with air respirators.

[0006] Preferably, the cooling system includes an oil chiller, the input and output ends of the oil chiller are connected to the interior of the upper oil tank through a fourth filter, cooling butterfly valves are provided on the output and input ends of the oil chiller, the travel switch signal of the cooling butterfly valve is connected to the output end of the electrical module, and a switch valve is also provided on the output end of the oil chiller, and the switch valve signal is connected to the output end of the electrical module.

[0007] Preferably, the output end of the second oil pump is provided with a first pressure gauge and a second pressure sensor, the output end of the second oil pump is connected to the two electric fuel pumps respectively through the first oil circuit, the output end of the second oil pump is connected to the input end of the overflow valve through the second oil circuit, the output ends of the two electric fuel pumps are also connected to the input end of the overflow valve through the overflow oil circuit, the output end of the overflow valve passes through the top wall of the upper oil tank and is connected to the interior of the upper oil tank, and the second pressure sensor signal is connected to the electrical module.

[0008] Preferably, a second pressure gauge and a third pressure sensor are provided on the overflow oil circuit between the overflow valve and the electric fuel pump.

[0009] Preferably, the electric fuel pump includes a fuel pump body, a diaphragm coupling, and a motor. The fuel pump body is connected to the motor via the diaphragm coupling, and the motor is connected to the output end of the electrical module.

[0010] Preferably, a bypass oil circuit is provided between the input end and the output end of the first filter, between the input end and the output end of the second filter, between the input end and the output end of the third filter, and between the input end and the output end of the fourth filter. The bypass oil circuit is provided with a first one-way valve. The flow direction of the first one-way valve on the first filter, the flow direction of the first one-way valve on the second filter, the flow direction of the first one-way valve on the third filter, and the flow direction of the first one-way valve on the fourth filter are respectively opposite to the flow direction inside the first filter, the flow direction inside the second filter, the flow direction inside the third filter, and the flow direction inside the fourth filter.

[0011] Preferably, a second one-way valve is provided at the output end of the first oil pump and the output end of the second oil pump, and the flow direction of the second one-way valve is the same as the output direction of the corresponding first oil pump or second oil pump.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. This application adopts an electric fuel pump in conjunction with an upper fuel tank and a lower fuel tank to design an electric fuel high-pressure common rail fuel supply unit for experimental research on fuel injection characteristics in a laboratory environment. It realizes the function of providing high-pressure and large-flow fuel to the high-pressure common rail fuel of a low-speed marine diesel engine, and the fuel pressure range and flow range are adjustable. This solves the problem that the current high-pressure common rail fuel injection system is not suitable for laboratories due to its large size and the use of internal combustion engine drive.

[0014] 2. The electric fuel pump in this application achieves ultra-high-pressure fuel pumping, with a rated pressure of 1250 bar. The high-pressure fuel pump module includes a motor-pump assembly. Each motor-pump assembly includes a motor, a fuel pump body, and a diaphragm coupling. The motor is connected to the fuel pump body via a diaphragm coupling. The fuel pump body is integrated with a proportional flow control valve to adjust the fuel flow range of the high-pressure fuel pump. The motor drives the fuel pump body to pump high-pressure fuel with adjustable pressure and flow.

[0015] 3. In this application, the two oil circuit manifolds integrate two high-pressure fuel lines, each with an electric fuel pump. Each high-pressure fuel line is connected to a first liquid pressure sensor to achieve real-time pressure monitoring and output of pressure analog signals. This provides high-pressure alarms and automatic safety control for the high-pressure fuel pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the schematic diagram of the present application.

[0017] Among them: 1. Lower fuel tank; 2. Upper fuel tank; 3. First fuel pump; 4. First filter; 5. Second filter; 6. First fuel inlet pipe; 7. Second fuel inlet pipe; 8. Oil return butterfly valve; 9. Third filter; 10. Second fuel pump; 11. Two-oil circuit integrated block; 12. Liquid level gauge; 13. Temperature sensor; 14. First liquid pressure sensor; 15. Air respirator; 16. Oil chiller; 17. Fourth filter; 18. Cooling butterfly valve; 19. Electrical module; 20. Switch valve; 21. First pressure gauge; 22. Second pressure sensor; 23. Overflow valve; 24. Second pressure gauge; 25. Third pressure sensor; 26. Fuel pump body; 27. Diaphragm coupling; 28. Motor; 29. ​​First one-way valve; 30. Second one-way valve. DETAILED DESCRIPTION

[0018] See also Figure 1 , an electric drive fuel high-pressure common rail fuel supply unit, comprising a lower fuel tank 1, an upper fuel tank 2, and an electrical module 19, wherein the upper fuel tank 2 is located above the lower fuel tank 1, and the lower fuel tank 1 and the upper fuel tank 2 are connected through a first fuel pump 3, the bottom of the upper fuel tank 2 is connected to the output end of the first fuel pump 3 through a first filter 4, and the top of the lower fuel tank 1 is connected to the input end of the first fuel pump 3 through a second filter 5, the lower fuel tank 1 is provided with a first fuel inlet pipe 6 and a second fuel inlet pipe 7, the first fuel inlet pipe 6 is provided with an oil return butterfly valve 8, the top of the upper fuel tank 2 is connected to the input end of the second fuel pump 10 through a third filter 9, and the output end of the second fuel pump 10 is connected to two electric drive fuel pumps, and the two electric drive fuel The output ends of the pumps are commonly connected to a two-oil circuit integrated block 11. A liquid level gauge 12 is provided in the upper oil tank 2 and the lower oil tank 1. A cooling system and a temperature sensor 13 are provided on the upper oil tank 2. A first liquid pressure sensor 14 is provided at the output end of the first oil pump 3, the output end of the second oil pump 10, and each oil outlet of the two oil circuit integrated blocks 11. The first liquid pressure sensor 14, the liquid level gauge 12, and the temperature sensor 13 are respectively connected to the input end of the electrical module 19 for signal transmission. The output end of the electrical module 19 is respectively connected to the first oil pump 3, the second oil pump 10, the two oil circuit integrated blocks 11, the return oil butterfly valve 8, and the cooling system. The top wall of the lower oil tank 1 and the upper oil tank 2 are both provided with an air respirator 15.

[0019] As a preferred embodiment, the cooling system includes an oil chiller 16, the input and output ends of the oil chiller 16 are connected to the interior of the upper oil tank 2 through a fourth filter 17, and a cooling butterfly valve 18 is provided on the output and input ends of the oil chiller 16. The travel switch signal of the cooling butterfly valve 18 is connected to the output end of the electrical module 19. A switch valve 20 is also provided on the output end of the oil chiller 16, and the signal of the switch valve 20 is connected to the output end of the electrical module 19.

[0020] As a preferred embodiment, the output end of the second oil pump 10 is provided with a first pressure gauge 21 and a second pressure sensor 22. The output end of the second oil pump 10 is connected to the two electric fuel pumps respectively through the first oil circuit. The output end of the second oil pump 10 is connected to the input end of the overflow valve 23 through the second oil circuit. The output ends of the two electric fuel pumps are also connected to the input end of the overflow valve 23 through the overflow oil circuit. The output end of the overflow valve 23 passes through the top wall of the upper oil tank 2 and is connected to the interior of the upper oil tank 2. The signal of the second pressure sensor 22 is connected to the electrical module 19.

[0021] As a preferred embodiment, a second pressure gauge 24 and a third pressure sensor 25 are provided on the overflow oil circuit between the overflow valve 23 and the electric fuel pump.

[0022] As a preferred embodiment, the electric fuel pump includes a fuel pump body 26 , a diaphragm coupling 27 , and a motor 28 . The fuel pump body 26 is connected to the motor 28 via the diaphragm coupling 27 , and the motor 28 is connected to the output end of the electrical module 19 .

[0023] As a preferred embodiment, a bypass oil circuit is provided between the input end and the output end of the first filter 4, between the input end and the output end of the second filter 5, between the input end and the output end of the third filter 9, and between the input end and the output end of the fourth filter 17. The bypass oil circuit is provided with a first one-way valve 29. The flow direction of the first one-way valve 29 on the first filter 4, the flow direction of the first one-way valve 29 on the second filter 5, the flow direction of the first one-way valve 29 on the third filter 9, and the flow direction of the first one-way valve 29 on the fourth filter 17 are respectively opposite to the flow direction inside the first filter 4, the flow direction inside the second filter 5, the flow direction inside the third filter 9, and the flow direction inside the fourth filter 17.

[0024] As a preferred embodiment, a second one-way valve 30 is provided at the output end of the first oil pump 3 and the output end of the second oil pump 10, and the flow direction of the second one-way valve 30 is the same as the output direction of the corresponding first oil pump 3 or second oil pump 10.

[0025] In this application, the lower fuel tank 1 utilizes liquid level differentials to automatically return fuel, collecting fuel returned from the fuel actuator. The collected fuel is automatically controlled by the lower fuel tank 1 based on the liquid level detected by the liquid level gauge 12, the first fuel pump 3, and the electrical module 19. When the liquid level in the lower fuel tank 1 reaches the upper level Lev2 set by the liquid level gauge 12, the electrical module 19 controls the first fuel pump 3 to start and operate, pumping fuel to the upper fuel tank 2. When the liquid level in the lower fuel tank 1 drops to the lower level Lev1 set by the liquid level gauge 12, the electrical module 19 controls the first fuel pump 3 to stop. This reciprocating cycle ensures safe fuel level control. The first fuel inlet pipe 6 is equipped with a shock absorber and a return oil butterfly valve 8. The valve position switch signal of the return oil butterfly valve 8 is connected to the electrical module 19. A ball valve is installed on the second fuel inlet pipe 7. Air respirators 15 installed on the upper and lower fuel tanks 2 and 1 ensure internal and external pressure balance between the upper and lower fuel tanks 2 and 1. The first filter 4, the second filter 5, the third filter 9, and the fourth filter 17 are all used to ensure the cleanliness of the oil in the entire oil circuit. The liquid level gauge 12 realizes real-time display of the oil hydraulic pressure and outputs an analog signal of the real-time liquid level. A switch butterfly valve is provided at the input end of the first oil pump 3 and the second oil pump 10 to shut off the oil in the tank during system maintenance. The travel switch of the switch butterfly valve is connected to the electrical module signal to detect the valve position of the switch butterfly valve. The second one-way valve 30 prevents the oil from flowing back and causing impact on the first oil pump 3 or the second oil pump 10. A pressure display is also provided between the output end of the first oil pump 3 and the upper oil tank 2 to detect the outlet pressure of the first oil pump 3. A hydraulic sensor is also provided at the outlet of the first oil pump 3, and the hydraulic sensor signal is connected to the electrical module to realize real-time detection of the outlet pressure of the first oil pump 3 and output of a pressure analog signal.

[0026] In the cooling system, a fourth filter 17 filters the oil in the upper oil tank 2 to ensure cleanliness. Cooling butterfly valves 18 are installed at both the output and input ends of the oil chiller 16 to shut off the oil in the upper oil tank 2 during system maintenance. The oil chiller 16 automatically operates according to the set cooling temperature to control the cooling of the oil in the upper oil tank 2. An on-off valve 20 installed on the oil outlet pipe of the oil chiller 16 ensures safe operation of the oil chiller 16. When the oil outlet pressure of the oil chiller 16 reaches the switch setting of the on-off valve 20, the valve core of the on-off valve 20 closes, and the oil chiller 16 is stopped via the electrical module 19.

[0027] The upper fuel tank 2 is used to store fuel and accommodate fuel tank accessories. The liquid level gauge 12 on the upper fuel tank 2 displays the liquid level in real time and outputs a real-time analog signal. It also communicates with the electrical module 19 to provide low and high liquid level alarms and safety protection. The air respirator 15 on the upper fuel tank 2 balances the internal and external pressures of the upper fuel tank 2. The temperature sensor 13 monitors the oil temperature in real time and outputs an analog signal to the electrical module 19 for automatic control of oil cooling within the upper fuel tank 2. The third filter 9 filters the oil drawn into the second fuel pump 10. A butterfly valve, connected to the electrical module 19, is installed on the oil pipe between the input of the second fuel pump 10 and the output of the upper fuel tank 2. This valve shuts off the oil in the upper fuel tank 2 during system maintenance. The second fuel pump 10 pumps fuel to the two integrated fuel circuit modules 11.

[0028] The second check valve 30 provided on the oil outlet pipe of the second oil pump 10 prevents oil from flowing back and causing impact on the second oil pump 10. The second oil pump 10 is connected to the overflow valve 23 through a bypass line to adjust the fuel pressure range output by the second oil pump 10.

[0029] The electric fuel pump achieves ultra-high-pressure fuel pumping, with a rated pressure of 1250 bar. The high-pressure fuel pump module consists of two motor-pump units. Each unit includes a motor 28, a fuel pump unit 26, and a diaphragm coupling 27. The motor 28 is connected to the fuel pump unit 26 via the diaphragm coupling 27. The fuel pump unit 26 is integrated with a proportional flow control valve to adjust the fuel flow range of the high-pressure fuel pump. The motor drives the fuel pump unit 26 to pump high-pressure fuel with adjustable pressure and flow.

[0030] The two-way manifold 11 integrates two high-pressure fuel lines, each with an electrically driven fuel pump. Each high-pressure fuel line is connected to a first liquid pressure sensor 14, which monitors the pressure in real time and outputs an analog pressure signal. This provides high-pressure alarms and automatic safety control for the high-pressure fuel pumps.

[0031] The electrical module 19 realizes the collection and processing of all signals of the electric drive fuel high-pressure common rail fuel supply unit, logic control, and safety protection, ensuring the safe and reliable operation of the fuel supply unit.

Claims

1. An electric fuel high-pressure common rail supply unit, characterized in that: The invention comprises a lower fuel tank (1), an upper fuel tank (2), and an electrical module (19), wherein the upper fuel tank (2) is located above the lower fuel tank (1), the lower fuel tank (1) and the upper fuel tank (2) are connected via a first fuel pump (3), the bottom of the upper fuel tank (2) is connected to the output end of the first fuel pump (3) via a first filter (4), the top of the lower fuel tank (1) is connected to the input end of the first fuel pump (3) via a second filter (5), the lower fuel tank (1) is provided with a first fuel inlet pipe (6) and a second fuel inlet pipe (7), the first fuel inlet pipe (6) is provided with an oil return butterfly valve (8), the top of the upper fuel tank (2) is connected to the input end of the second fuel pump (10) via a third filter (9), the output end of the second fuel pump (10) is connected to two electric fuel pumps, and the output ends of the two electric fuel pumps are connected in common. A two-way oil-circuit integrated block (11) is connected, a liquid level gauge (12) is provided in each of the upper oil tank (2) and the lower oil tank (1), a cooling system and a temperature sensor (13) are provided on the upper oil tank (2), a first liquid pressure sensor (14) is provided at the output end of the first oil pump (3), the output end of the second oil pump (10), and each oil outlet of the two oil-circuit integrated blocks (11), respectively, the first liquid pressure sensor (14), the liquid level gauge (12), and the temperature sensor (13) are respectively connected to the input end of the electrical module (19), and the output end of the electrical module (19) is respectively connected to the first oil pump (3), the second oil pump (10), the two oil-circuit integrated blocks (11), the oil return butterfly valve (8), and the cooling system, and an air respirator (15) is provided on the top wall of the lower oil tank (1) and the upper oil tank (2); The cooling system includes an oil cooler (16), the input end and the output end of the oil cooler (16) are both connected to the interior of the upper oil tank (2) through a fourth filter (17), a cooling butterfly valve (18) is provided on the output end and the input end of the oil cooler (16), the travel switch signal of the cooling butterfly valve (18) is connected to the output end of the electrical module (19), and a switch valve (20) is further provided on the output end of the oil cooler (16), and the switch valve (20) signal is connected to the output end of the electrical module (19); The output end of the second oil pump (10) is provided with a first pressure gauge (21) and a second pressure sensor (22). The output end of the second oil pump (10) is respectively connected to the two electric fuel pumps through the first oil circuit. The output end of the second oil pump (10) is connected to the input end of the overflow valve (23) through the second oil circuit. The output ends of the two electric fuel pumps are also connected to the input end of the overflow valve (23) through the overflow oil circuit. The output end of the overflow valve (23) passes through the top wall of the upper oil tank (2) and is connected to the interior of the upper oil tank (2). The signal of the second pressure sensor (22) is connected to the electrical module (19).

2. The electric drive fuel high pressure common rail oil supply unit according to claim 1, characterized in that: A second pressure gauge (24) and a third pressure sensor (25) are provided on the overflow oil circuit between the overflow valve (23) and the electric fuel pump.

3. The electric drive fuel high pressure common rail oil supply unit according to claim 1, characterized in that: The electric fuel pump comprises a fuel pump body (26), a diaphragm coupling (27), and a motor (28). The fuel pump body (26) is connected to the motor (28) via the diaphragm coupling (27), and the motor (28) is connected to the output end of the electrical module (19).

4. The electric drive fuel high pressure common rail oil supply unit according to claim 2, characterized in that: A bypass oil circuit is provided between the input end and the output end of the first filter (4), between the input end and the output end of the second filter (5), between the input end and the output end of the third filter (9), and between the input end and the output end of the fourth filter (17). A first one-way valve (29) is provided on each of the bypass oil circuits. The flow direction of the first one-way valve (29) on the first filter (4), the flow direction of the first one-way valve (29) on the second filter (5), the flow direction of the first one-way valve (29) on the third filter (9), and the flow direction of the first one-way valve (29) on the fourth filter (17) are respectively opposite to the flow direction inside the first filter (4), the flow direction inside the second filter (5), the flow direction inside the third filter (9), and the flow direction inside the fourth filter (17).

5. The electric drive fuel high pressure common rail oil supply unit according to claim 1, characterized in that: A second one-way valve (30) is provided at the output end of the first oil pump (3) and the output end of the second oil pump (10), and the flow direction of the second one-way valve (30) is the same as the output direction of the corresponding first oil pump (3) or second oil pump (10).

Images