Multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly

Abstract

The invention provides a multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly, and belongs to the technical field of multi-fuel injection of internal combustion engines. Comprising a two-stage and three-stage electric pressure pump, an oil delivery pump penetrates through one side of the two-stage and three-stage electric pressure pump through a bolt thread, and an oil outlet connector, an A positive and negative pressure air connector, an oil delivery port and a B positive and negative pressure air connector are connected to the upper surface of the oil delivery pump in an inserted mode. Through the arrangement of the oil delivery pump, the effect that the oil delivery pump can be firmly fixed to the shell of the two-stage and three-stage electric booster pump for use is achieved, and the problem that the whole equipment cannot continue to operate due to the fact that the oil delivery pump loosens and falls off after vibration occurs during operation of the whole equipment is solved; the fuel outlet connector of the fuel delivery pump is connected with the inlet of the fuel temporary storage cavity in a matched mode, and the problems that due to the fact that the fuel temporary storage cavity is located in the equipment, fuel in the fuel tank cannot be directly added into the fuel temporary storage cavity, and the fuel cannot be stored in the fuel temporary storage cavity after certain pressure is obtained in the fuel are solved.

Description

Technical Field

[0001] The invention relates to the technical field of multi-fuel injection of internal combustion engines, and in particular to a multi-fuel electromechanical three-stage coupling progressive boosting pump assembly. Background Art

[0002] At present, with the changes in the international energy market, the decreasing petrochemical resources and increasingly stringent emission regulations, the energy structure transformation multi-fuel internal combustion engine is the focus of research and development in many countries in the world today, so as to reduce the dependence on traditional oil resources. The multi-fuel internal combustion engine is an engine that can alternately use different types of fuels. At the same time, the application of multi-fuel engines in special fields has its unique advantages. It can realize the free switching of power fuel according to different application scenarios and different fuel supply varieties to ensure the normal operation of the engine.

[0003] However, the existing devices lack the ability to integrate the oil pump, filter, second and third stage electric booster pumps, oil pipes, etc. into one assembly, which greatly reduces the layout space. Only the installation interface needs to be provided. It is very easy for the overall device to be unable to use multiple devices internally due to the inability to integrate more devices into one assembly. There is also a lack of a device that can meet the free switching of multiple fuels, and has a large and stable oil supply to meet the needs of multiple fuel engines with a high power-to-weight ratio. It is very easy for the equipment to be unable to operate normally for a long time due to the small oil supply. Therefore, the present application provides a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly to meet the needs. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly, which solves the problems that the prior art devices are unable to integrate the oil transfer pump, filter, second and third stage electric booster pumps, oil pipes, etc. into one assembly and are unable to highly integrate the entire three-stage pump, thereby greatly increasing safety, being able to meet the free switching of multiple fuels, and having a large and stable fuel supply, which can meet the needs of multi-fuel engines with a high power-to-weight ratio.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly, including a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly, including a second and third-stage electric booster pump, one side of the second and third-stage electric booster pump is penetrated by an oil delivery pump through a bolt thread, the upper surface of the oil delivery pump is plugged with an oil outlet joint, one side of the oil delivery pump is plugged with an A positive and negative pressure air interface, the upper surface of the oil delivery pump is plugged with an oil delivery port, one side of the oil delivery pump is provided with a B positive and negative pressure air interface, the interior of the second and third-stage electric booster pump is provided with a filter element, the upper surface of the second and third-stage electric booster pump is plugged with an upper shell, the second and third The upper surface of the second- and third-stage electric pressure pump is plugged with an air connecting head, the upper surface of the second- and third-stage electric pressure pump is provided with an oil outlet copper head, the interior of the second- and third-stage electric pressure pump is plugged with an oil pipe, the lower surface of the second- and third-stage electric pressure pump is plugged with a lower shell, the interior of the second- and third-stage electric pressure pump is provided with an oil outlet transition head, the interior of the second- and third-stage electric pressure pump is provided with a ejector pin, the interior of the second- and third-stage electric pressure pump is provided with a float assembly, the interior of the second- and third-stage electric pressure pump is provided with a pressure strip, the interior of the second- and third-stage electric pressure pump is plugged with a low-pressure electric pump, and one side of the second- and third-stage electric pressure pump is sleeved with Sealing strip, a hook is provided inside the second and third stage electric booster pump, a high-pressure electric pump is plugged inside the second and third stage electric booster pump, a sensor connector is plugged on one side of the second and third stage electric booster pump, a small plastic round shell is plugged on one side of the second and third stage electric booster pump, a throttle valve is plugged inside the second and third stage electric booster pump, a temporary fuel storage chamber is provided inside the lower shell, an oil storage chamber is provided inside the lower shell, a groove is provided inside the lower shell, a small plastic round shell placement hole is provided inside the lower shell, a sensor connector mounting hole is provided inside the lower shell, and the lower shell A throttle valve mounting hole is provided inside the body, a low-pressure electric pump oil outlet mounting hole is provided inside the lower shell body, a filter element mounting hole is provided inside the upper shell body, a channel is provided inside the upper shell body, an oil outlet transition head mounting hole is provided inside the upper shell body, an oil outlet copper head mounting hole is provided inside the upper shell body, an oil outlet mounting hole of a high-pressure electric pump is provided inside the upper shell body, a mounting cylindrical surface is inserted on the upper surface of the oil outlet transition head, an oil outlet channel is provided inside the oil outlet transition head, a plurality of oil dispersion holes are provided inside the oil outlet transition head, and a thimble matching hole is provided inside the oil outlet transition head.

[0006] Preferably, a rubber cone head is inserted into the upper surface of the ejector pin, one end of the rubber cone head can penetrate the cylinder and be connected to the ejector pin, the surface of the ejector pin is sleeved with the cylinder, both ends of the cylinder are provided with plug-in holes, which can respectively insert the rubber cone head and the hook, the lower surface of the ejector pin is provided with a hook slot, and the lower surface of the hook slot is provided with.

[0007] Preferably, a plastic body is sleeved on the surface of the float assembly, the shape of the plastic body is the same as that of the float assembly and can cover the float assembly, a pull ring is provided on one side of the float assembly, a circular ring structure is provided at one end of the pull ring, and a long protruding object is provided on the surface of the circular ring structure.

[0008] Preferably, a pressure strip installation hole is provided on one side of the pressure strip, and the number of the pressure strip installation holes is two and both are distributed on both sides of the pressure strip. A pressure plate is inserted on one side of the pressure strip, and the pressure plate is in the shape of a protruding long strip.

[0009] Preferably, a low-pressure electric pump shock absorber is provided on the surface of the low-pressure electric pump, and the low-pressure electric pump shock absorber can fully cover and shock the low-pressure electric pump. A plug-in copper sheet is provided on one side of the low-pressure electric pump, and two docking holes are provided on the surface of the plug-in copper sheet from left to right, and one docking hole can be connected to the low-pressure electric pump and the other can be connected to an external connector.

[0010] Preferably, an oil outlet corrugated rubber head is sleeved on one side of the low-pressure electric pump, and a relatively thick circular barrier is provided at one end of the oil outlet corrugated rubber head.

[0011] Preferably, a high-pressure electric pump oil outlet head is provided at one end of the high-pressure electric pump, and the upper circular shape of the high-pressure electric pump oil outlet head is smaller, and the lower circular shape is larger.

[0012] Preferably, a high-voltage electric pump connector is provided at one end of the high-voltage electric pump, the high-voltage electric pump connector is located on the upper surface of the high-voltage electric pump and can be connected to an external connector, a buffer body is sleeved on the surface of the high-voltage electric pump, the buffer body is located on the lower outer surface of the high-voltage electric pump, and the high-voltage electric pump is circular and corresponds to the surface of the high-voltage electric pump.

[0013] Preferably, the interior of the small plastic round shell is provided with an arc surface, the arc surface is located at the lower part of one side of the small plastic round shell, the interior of the small plastic round shell is an arc shape corresponding to the arc surface, and the lower surface of the small plastic round shell is provided with a bottom oil hole.

[0014] Preferably, a plastic small round shell oil return hole is provided on one side of the plastic small round shell, and a plastic small round shell oil return hole is provided on the other side of the plastic small round shell. The plastic small round shell oil return hole does not penetrate the plastic small round shell, and an oil return mounting hole is provided inside the lower shell body.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, the oil pump and the second and third stage electric booster pumps are provided, so that the oil pump can be firmly fixed on the housing of the second and third stage electric booster pumps for use, and the problem that the oil pump becomes loose and falls off after the vibration occurs during the operation of the overall equipment, so that the overall equipment cannot continue to operate is reduced. The oil outlet joint of the oil pump is connected with the inlet of the temporary fuel storage chamber, so that the fuel can pass through the inside of the oil pump and fill the fuel into the temporary fuel storage chamber for storage after the fuel is filled with a certain pressure inside the oil pump, and the problem that the fuel in the fuel tank cannot be directly added to the temporary fuel storage chamber and the fuel cannot be stored in the temporary fuel storage chamber after a certain pressure is obtained due to the temporary fuel storage chamber being inside the equipment is reduced. The fuel in the fuel tank is connected to the oil delivery port on the oil pump through a fuel hose, which can accurately add the fuel in the fuel tank to the inside of the oil pump, and reduce the problem of fuel spilling due to the shaking of the staff when adding the fuel to the inside of the oil pump, and then the positive and negative pressure compressed air is alternately introduced into the positive and negative pressure A The air interface and the B positive and negative pressure air interface play an effect of effectively utilizing alternating positive and negative pressure air power to transport the fuel to the temporary fuel storage chamber through the fuel pump, reducing the problem that the fuel inside the fuel pump cannot be pressurized after the fuel is added to the fuel pump, resulting in the fuel being unable to be quickly transported to the temporary fuel storage chamber inside the fuel pump and the fuel hose. The sealing strip can effectively seal the interior of the entire equipment, reducing the problem of external air entering due to gaps at the edge of the entire equipment or fuel spilling inside the internal temporary fuel storage chamber and spilling out of the entire equipment. The upper shell and the lower shell are fastened together, which effectively fixes the upper shell and the lower shell, reducing the problem that the upper shell and the lower shell become loose after the entire equipment has been running for a long time, resulting in the entire equipment being unable to operate normally. The filter element can achieve the effect of filtering the fuel through the filter element before entering the oil storage chamber, reducing the problem of reduced fuel quality during later use due to trace impurities attached to the fuel when it enters.

[0016] By pressing the oil outlet transition head into the oil outlet transition head mounting hole through the installation cylindrical surface interference fit, the oil outlet transition head can be quickly and conveniently removed and fixed, reducing the problem of wasting installation time of the entire equipment due to the inconvenient installation and removal of the oil outlet transition head and reducing the shaking of the oil outlet transition head during use. The ejector pin can effectively fix the ejector pin, reducing the problem of the ejector pin loosening and falling during operation. The rubber cone head can support the oil outlet channel, and the oil outlet channel can be effectively blocked so that the entire equipment can block the fuel inside the entire equipment when it is not necessary to discharge the fuel, reducing the problem of oil leakage during the operation of the entire equipment. The plastic body in the float assembly can be suspended in the oil storage cavity. Through the pull ring, a lever principle is formed to pull the ejector pin to slide up and down in the ejector pin matching hole to form a switch valve. The pull hook can be manually pulled out or inserted to achieve the effect of switching the oil outlet channel, achieving the effect of being able to quickly flow the fuel into the oil storage cavity in a dispersed state, reducing the problem of a long time when the fuel flows into the oil storage cavity. The shock absorbing body of the low-pressure electric pump can The invention can effectively reduce the vibration of the low-pressure electric pump when it is running, and reduce the problem of strong vibration of the low-pressure electric pump when it is running inside the upper shell and the lower shell. Through the oil-discharging corrugated rubber head, the fuel can be effectively added to the low-pressure electric pump, so that the low-pressure electric pump can be quickly replenished after the fuel is exhausted after a long-term operation, and the problem that the low-pressure electric pump cannot run due to a small amount of oil when running and the entire equipment needs to be stopped before the fuel can be filled into the low-pressure electric pump is filled. The pressure plate can reduce the vibration of the low-pressure electric pump together with the low-pressure electric pump shock absorber, and reduce the problem that the low-pressure electric pump has a large vibration amplitude and cannot be reduced when the low-pressure electric pump shock absorber is used to reduce the vibration of the low-pressure electric pump alone. The screw passes through the pressure strip mounting hole, and the effect of fixing the low-pressure electric pump is achieved, and the problem of loosening and falling of the low-pressure electric pump due to the long-term operation of the overall equipment is reduced. By plugging in the copper sheet, the effect of quickly providing power to the low-pressure electric pump is achieved, and the problem of stopping the low-pressure electric pump due to the inability to power the low-pressure electric pump is reduced.

[0017] By placing the small plastic round shell inside the small plastic round shell placement hole, the small plastic round shell can be fixed in place. Through the throttle valve, the throttle valve can be fixed, and the excess fuel can be easily returned to the oil storage chamber, reducing the problem of excess fuel being unable to flow back into the oil storage chamber and remaining inside the overall equipment and unable to be discharged or stored. Through the sensor connector, the effect of being able to conveniently debug or troubleshoot the electric pump assembly or troubleshoot a fault can be achieved from an external sensor here, reducing the problem of being unable to repair or troubleshoot the electric pump assembly when it fails. Placing the high-pressure electric pump above the small plastic round shell can effectively fix it and enable its buffer body to buffer oil pressure fluctuations. The high-pressure electric pump connector can be connected to the external connector, which is convenient for providing power to the high-pressure electric pump so that it can be used for a long time, reducing the problem of the high-pressure electric pump being unable to be used for a long time due to the inability to provide power to the high-pressure electric pump for a long time.

[0018] In summary, the present invention has the advantages of being able to integrate the oil pump, filter, second and third stage electric booster pumps, oil pipes, etc. into one assembly, greatly reducing the layout space, and only requiring the provision of an installation interface; adopting an electric three-stage pump to gradually pressurize the oil to a low pressure, avoiding the complex structure of a high-pressure pump body, and greatly reducing the strength, complexity and cost of the entire pump assembly; the entire three-stage pump is highly integrated, which greatly increases safety, can meet the free switching of multiple fuels, and has a large and stable oil supply, which can meet the needs of multiple fuel engines with a high power-to-weight ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Figure 2 It is a structural schematic diagram of one side of the oil delivery pump of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Figure 3 It is a structural schematic diagram of the other side of the oil delivery pump of the multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly; Figure 4 It is a schematic diagram of the structure of the second and third stage electric booster pumps of the multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Figure 5 It is a schematic diagram of the other side structure of the second and third stage electric booster pumps of the multi-fuel electromechanical three-stage coupled progressive booster pump assembly; Figure 6 It is a schematic diagram of the cross-sectional structure of the second and third stage electric booster pumps of the multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Figure 7 It is a schematic diagram of the lower casing structure of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Figure 8It is a schematic diagram of the upper casing structure of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Fig. 9 It is a schematic diagram of the oil outlet transition head structure of a multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly; Fig.10 It is a schematic diagram of the ejector pin structure of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Fig.11 It is a schematic diagram of the structure of the float assembly of a multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly; Fig.12 It is a schematic diagram of the structure of the pressure strip of a multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly; Fig.13 It is a schematic diagram of the structure of a low-pressure electric pump of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Fig.14 It is a schematic diagram of the structure of a high-pressure electric pump of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Fig.15 It is a schematic diagram of the plastic small round shell structure of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly; Fig.16 It is a schematic diagram of the structure of the other side of the plastic small round shell of the multi-fuel electromechanical three-stage coupling step-by-step booster pump assembly; Fig.17 This is a schematic diagram of the sealing strip structure of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly.

[0020] [Reference Signs] 1. Second and third stage electric booster pump; 2. Oil delivery pump; 3. Oil outlet connector; 4. A positive and negative pressure air interface; 5. Oil delivery port; 6. B positive and negative pressure air interface; 7. Filter element; 8. Upper shell; 9. Air connecting head; 10. Oil outlet copper head; 11. Oil pipe; 12. Lower shell; 13. Oil outlet transition head; 14. Ejector; 15. Float assembly; 16. Pressure strip; 17. Low pressure electric pump; 18. Sealing strip; 19. Draw hook; 20. High pressure electric pump; 21. Sensor connector; 22. Plastic small round shell; 23. Throttle valve; 24. Temporary fuel storage chamber; 25. Oil storage chamber; 26. Groove; 27. Plastic small round shell placement hole; 28. Sensor connector installation hole; 29. ​​Throttle valve installation hole; 30. Low pressure electric pump Oil outlet mounting hole; 31. Filter element mounting hole; 32. Channel; 33. Oil outlet transition head mounting hole; 34. Oil outlet copper head mounting hole; 35. High-voltage electric pump oil outlet mounting hole; 36. Mounting cylindrical surface; 37. Oil outlet channel; 38. Multiple small holes for dispersing oil; 39. Ejector matching hole; 40. Rubber cone head; 41. Cylinder; 42. Draw hook slot; 43. Plastic body; 44. Pull ring; 45. Pressure strip mounting hole; 46. Pressure plate; 47. Low-voltage electric pump shock absorber; 48. Plug-in copper sheet; 49. Oil outlet corrugated rubber head; 50. High-voltage electric pump oil outlet head; 51. High-voltage electric pump connector; 52. Buffer body; 53. Arc surface; 54. Bottom oil hole; 55. Plastic small round shell oil return hole; 56. Oil return mounting hole.

[0021] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0022] The following is a detailed description of a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0023] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0024] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0025] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0026] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0027] like Figures 1 to 8As shown, an embodiment of the present invention provides a multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly, including a two-stage and three-stage electric booster pump 1, an oil delivery pump 2 is penetrated through one side of the two-stage and three-stage electric booster pump 1 by a bolt thread, an oil outlet connector 3 is plugged into the upper surface of the oil delivery pump 2, an A positive and negative pressure air interface 4 is plugged into one side of the oil delivery pump 2, an oil delivery port 5 is plugged into the upper surface of the oil delivery pump 2, a B positive and negative pressure air interface 6 is provided on one side of the oil delivery pump 2, a filter element 7 is provided inside the two-stage and three-stage electric booster pump 1, and an upper shell 8 is plugged into the upper surface of the two-stage and three-stage electric booster pump 1. The upper surface of the second and third stage electric booster pump 1 is plugged with an air connection head 9, the upper surface of the second and third stage electric booster pump 1 is provided with an oil outlet copper head 10, the interior of the second and third stage electric booster pump 1 is plugged with an oil pipe 11, the lower surface of the second and third stage electric booster pump 1 is plugged with a lower shell 12, the interior of the second and third stage electric booster pump 1 is provided with an oil outlet transition head 13, the interior of the second and third stage electric booster pump 1 is provided with a ejector pin 14, the interior of the second and third stage electric booster pump 1 is provided with a float assembly 15, the interior of the second and third stage electric booster pump 1 is provided with a pressure strip 16, and the interior of the second and third stage electric booster pump 1 is plugged with A low-pressure electric pump 17, a sealing strip 18 is sleeved on one side of the second- or third-stage electric booster pump 1, a hook 19 is arranged inside the second- or third-stage electric booster pump 1, a high-pressure electric pump 20 is plugged into the second- or third-stage electric booster pump 1, a sensor connector 21 is plugged into one side of the second- or third-stage electric booster pump 1, a small plastic round shell 22 is plugged into one side of the second- or third-stage electric booster pump 1, a throttle valve 23 is plugged into the second- or third-stage electric booster pump 1, a temporary fuel storage chamber 24 is arranged inside the lower shell 12, an oil storage chamber 25 is arranged inside the lower shell 12, and the interior of the lower shell 12 A groove 26 is provided, a small plastic round shell placement hole 27 is provided inside the lower shell 12, a sensor joint mounting hole 28 is provided inside the lower shell 12, a throttle valve mounting hole 29 is provided inside the lower shell 12, a low-pressure electric pump oil outlet mounting hole 30 is provided inside the lower shell 12, a filter element mounting hole 31 is provided inside the upper shell 8, a channel 32 is provided inside the upper shell 8, an oil outlet transition head mounting hole 33 is provided inside the upper shell 8, an oil outlet copper head mounting hole 34 is provided inside the upper shell 8, and a high-pressure electric pump oil outlet mounting hole 35 is provided inside the upper shell 8.

[0028] Through the oil pump 2 and the secondary and tertiary electric pressure pump 1, two bolts can be used to fix the oil pump 2 on the housing of the secondary and tertiary electric pressure pump 1, so that the oil pump 2 can be firmly fixed on the housing of the secondary and tertiary electric pressure pump 1 for use, and the problem that the oil pump 2 loosens and falls off after the vibration occurs during the operation of the overall equipment, so that the overall equipment cannot continue to operate, is reduced. The oil outlet joint 3 of the oil pump 2 is connected with the inlet of the temporary fuel storage chamber 24, so that the fuel can pass through the inside of the oil pump 2 and the fuel is filled into the temporary fuel storage chamber 24 for storage after it is filled with a certain pressure inside the oil pump 2, and the problem that the fuel in the fuel tank cannot be directly added to the temporary fuel storage chamber 24 and the fuel cannot be stored in the temporary fuel storage chamber 24 after it is pressurized inside due to the temporary fuel storage chamber 24 being inside the equipment is reduced. The fuel in the fuel tank is connected to the oil delivery port 5 on the oil pump 2 through a fuel hose, which can accurately add the fuel in the fuel tank to the inside of the oil pump 2, and reduce the problem that the staff shakes when adding fuel to the inside of the oil pump 2. The problem of fuel spilling is solved by alternately introducing compressed air with alternating positive and negative pressures into the positive and negative pressure air interface A 4 and the positive and negative pressure air interface B 6, which effectively utilizes the alternating positive and negative pressure air power to transport the fuel through the fuel pump 2 to the temporary fuel storage chamber 24, reducing the problem that after adding fuel to the fuel pump 2, the fuel inside the fuel pump 2 cannot be pressurized, resulting in the fuel inside the fuel pump 2 and the fuel hose cannot be quickly transported to the temporary fuel storage chamber 24. Through the sealing strip 18, the sealing strip 18 can be manually installed into the groove 26 in the lower shell 12, so as to achieve the effect of effectively sealing the interior of the entire equipment, reducing the problem of external air entering due to gaps at the edge of the entire equipment or the fuel inside the internal temporary fuel storage chamber 24 spilling and spilling out of the entire equipment. Then, the upper shell 8 and the lower shell 12 are fastened together with screws, which effectively fixes the upper shell 8 and the lower shell 12, reducing the problem that the upper shell 8 and the lower shell 12 become loose after the entire equipment has been running for a long time, resulting in the entire equipment being unable to operate normally.

[0029] Through the filter element 7, the filter element 7 can be manually screwed into the filter element mounting hole 31, so that the fuel can enter the oil storage chamber 25 after being filtered by the filter element 7, reducing the problem of reduced fuel quality during later use due to trace impurities attached to the fuel when it enters the fuel. The oil outlet transition head 13 is pressed into the oil outlet transition head mounting hole 33 through the mounting cylindrical surface 36, so that the oil outlet transition head 13 can be quickly and conveniently removed and fixed, reducing the problem of wasting the installation time of the entire equipment due to the inconvenient installation and removal of the oil outlet transition head 13 and reducing the shaking of the oil outlet transition head 13 when in use. Through the ejector pin 14, the cylindrical body 41 of the ejector pin 14 can be manually fitted into the ejector pin fitting hole 39 with clearance, which effectively fixes the ejector pin 14 and reduces the problem of loosening and falling of the ejector pin 14 during operation.

[0030] The rubber cone head 40 can support the oil outlet channel 37, and the oil outlet channel 37 can be effectively blocked so that the overall device can block the fuel inside the overall device when it is not needed to discharge the fuel, thereby reducing the problem of oil leakage during the operation of the overall device. The plastic body 43 in the float assembly 15 can be suspended in the oil storage chamber 25 and connected to the upper shell 8 through the pull ring 44. One end of the hook 19 is connected to the hook slot 42, and the other end is connected to the pull ring 44. In this way, a lever principle is formed to pull the ejector pin 14 to slide up and down in the ejector pin matching hole 39 to form a switch valve. The hook 19 can be manually pulled out or inserted to achieve the effect of switching the oil outlet channel 37. When the oil channel is opened, the fuel flows into the oil storage chamber 25 through a plurality of oil dispersion holes 38, thereby achieving the effect of quickly allowing the fuel to flow into the oil storage chamber 25 in a dispersed state, thereby reducing the problem of a long time required for the fuel to flow into the oil storage chamber 25.

[0031] like Figures 9 to 17As shown, in this embodiment, the upper surface of the oil outlet transition head 13 is plugged with a mounting cylindrical surface 36, the interior of the oil outlet transition head 13 is provided with an oil outlet channel 37, the interior of the oil outlet transition head 13 is provided with a plurality of oil dispersion holes 38, the interior of the oil outlet transition head 13 is provided with an ejector matching hole 39, the upper surface of the ejector 14 is plugged with a rubber cone head 40, one end of the rubber cone head 40 can penetrate the cylinder 41 and connect with the ejector 14, the surface of the ejector 14 is sleeved with a cylinder 41, both ends of the cylinder 41 are provided with plug-in holes, which can respectively insert the rubber cone head 40 and the hook 19, the lower surface of the ejector 14 is provided with a hook slot 42, and the lower surface of the hook slot 42 is provided with a surface of the float assembly 15 A plastic body 43 is sleeved on the surface, and the shape of the plastic body 43 is the same as that of the float assembly 15, and the float assembly 15 can be covered. A pull ring 44 is provided on one side of the float assembly 15, and a circular ring structure is provided at one end of the pull ring 44. A long protruding object is provided on the surface of the circular ring structure. A bead mounting hole 45 is provided on one side of the bead 16. The number of bead mounting holes 45 is two, and they are distributed on both sides of the bead 16. A pressure plate 46 is inserted on one side of the bead 16, and the pressure plate 46 is a protruding long strip. A low-pressure electric pump shock-absorbing body 47 is provided on the surface of the low-pressure electric pump 17. The low-pressure electric pump shock-absorbing body 47 can fully cover and shock the low-pressure electric pump 17. A plug-in copper sheet is provided on one side of the low-pressure electric pump 17 48, two docking holes are arranged on the surface of the plug-in copper sheet 48 from left to right, and one docking hole can be connected to the low-pressure electric pump 17 and the other can be connected to an external connector. An oil outlet corrugated rubber head 49 is sleeved on one side of the low-pressure electric pump 17, and a relatively thick circular barrier is arranged on one end of the oil outlet corrugated rubber head 49. A high-pressure electric pump oil outlet head 50 is arranged on one end of the high-pressure electric pump 20, and the upper circular shape of the high-pressure electric pump oil outlet head 50 is smaller and the lower circular shape is larger. A high-pressure electric pump connector 51 is arranged on one end of the high-pressure electric pump 20, and the high-pressure electric pump connector 51 is located on the upper surface of the high-pressure electric pump 20 and can be connected to an external connector. The surface sleeve of the high-pressure electric pump 20 A buffer body 52 is connected, and the buffer body 52 is located on the lower outer surface of the high-voltage electric pump 20. The high-voltage electric pump 20 is circular and corresponds to the surface of the high-voltage electric pump 20. An arc surface 53 is provided inside the plastic small round shell 22. The arc surface 53 is located at the lower part of one side of the plastic small round shell 22. The inside of the plastic small round shell 22 is an arc shape corresponding to the arc surface 53. A bottom oil hole 54 is provided on the lower surface of the plastic small round shell 22, a plastic small round shell oil return hole 55 is provided on one side of the plastic small round shell 22, and a plastic small round shell oil return hole 55 is provided on the other side of the plastic small round shell 22. The plastic small round shell oil return hole 55 does not penetrate the plastic small round shell 22, and an oil return mounting hole 56 is provided inside the lower shell 12.

[0032] By placing the low-pressure electric pump shock-absorbing body 47 horizontally into the lower shell 12 and covering the low-pressure electric pump 17, it can play an effective shock-absorbing effect when the low-pressure electric pump 17 is running, reducing the problem of strong vibration of the low-pressure electric pump 17 when it is running inside the upper shell 8 and the lower shell 12. The oil outlet corrugated rubber head 49 can be inserted into the low-pressure electric pump oil outlet mounting hole 30, which can effectively add fuel to the low-pressure electric pump 17, so that the low-pressure electric pump 17 can quickly replenish the fuel inside after running for a long time and running out of fuel, reducing the need to stop the entire equipment when the low-pressure electric pump 17 cannot run due to insufficient oil. The fuel can only be filled into the low-pressure electric pump 17 after operation. The pressure plate 46 presses tightly on the low-pressure electric pump shock absorber 47, thereby achieving the effect of shock-absorbing the low-pressure electric pump 17 together with the low-pressure electric pump shock absorber 47, reducing the problem that the low-pressure electric pump 17 has a large vibration amplitude and cannot be shock-absorbing when the low-pressure electric pump shock absorber 47 alone shocks the low-pressure electric pump 17. The low-pressure electric pump 17 is fastened to the lower shell 12 by screws passing through the pressure strip mounting holes 45, which has the effect of fixing the low-pressure electric pump 17, reducing the problem of the low-pressure electric pump 17 loosening and falling when the overall equipment is running for a long time.

[0033] By connecting the copper sheet 48 to an external connector, the effect of quickly providing power to the low-voltage electric pump 17 is achieved, and the problem of the low-voltage electric pump 17 stopping running due to the inability to power the low-voltage electric pump 17 is reduced. The plastic small round shell 22 is placed inside the plastic small round shell placement hole 27, which has the effect of fixing the plastic small round shell 22. The arc surface 53 is opposite to the oil outlet end of the low-pressure electric pump, and the plastic small round shell oil return hole 55 is opposite to the oil return mounting hole 56, which enables the inflowing fuel to flow up to the inside of the plastic small round shell 22 through the bottom oil hole 54, thereby providing fuel for the high-voltage electric pump 20, and reducing the problem of the inflowing fuel being unable to enter the inside of the plastic small round shell 22.

[0034] The throttle valve 23 is installed in the throttle valve mounting hole 29, which has the effect of fixing the throttle valve 23 and facilitating the excess fuel to flow back into the oil storage chamber 25, thereby reducing the problem that the excess fuel cannot flow back into the oil storage chamber 25 and remains inside the overall equipment and cannot be discharged or stored. The sensor connector 21 can be installed in the sensor connector mounting hole 28 for fixing, thereby achieving the effect of facilitating debugging or troubleshooting of the electric pump assembly or troubleshooting from an external sensor, thereby reducing the problem that the electric pump assembly cannot be repaired or troubleshooted when it fails. The high-pressure electric pump 20 is placed above the small plastic round shell 22, and the high-pressure electric pump oil outlet head 5 0 is inserted into the oil outlet mounting hole 35 of the high-pressure electric pump, and the entire high-pressure electric pump 20 is vertically clamped inside the upper and lower shells, which can effectively fix it and enable its buffer body 52 to buffer oil pressure fluctuations. The high-pressure electric pump connector 51 can be connected to an external connector, which is convenient for providing power to the high-pressure electric pump 20 so that it can be used for a long time, reducing the problem that the high-pressure electric pump 20 cannot be used for a long time due to the inability to provide power to the high-pressure electric pump 20 for a long time. The oil outlet copper head 10 is connected to the oil outlet copper head mounting hole 34 to fix it in place, and the oil pipe 11 is fastened to the oil outlet copper head 10 with a clamp to fix the oil pipe 11, and the air connecting head 9 is directly tightened in the threaded hole on the upper shell 8.

[0035] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0036] A multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly, when in use, comprises the following steps; Step 1: Through the oil transfer pump and the second and third stage electric booster pump, two bolts can be used to fix the oil transfer pump on the housing of the second and third stage electric booster pump. The oil outlet joint of the oil transfer pump is connected with the inlet of the temporary fuel storage chamber. Then the fuel in the fuel tank is connected with the oil transfer port on the oil transfer pump through the fuel hose. Then, the compressed air with alternating positive and negative pressures is alternately introduced into the positive and negative pressure air interface A and the positive and negative pressure air interface B. The sealing strip can be manually installed into the groove in the lower housing, and then the upper housing and the lower housing are fastened together with screws. Step 2: Screw the filter element into the filter element installation hole, and press the oil outlet transition head into the oil outlet transition head installation hole through the installation cylindrical surface; Step 3: The cylinder of the ejector can be manually fitted into the ejector fitting hole through the ejector, and the oil outlet channel can be supported by the rubber cone head, so that the plastic body in the float assembly can be suspended in the oil storage cavity; Step 4, connect it with the upper housing through the pull ring, one end of the pull hook is connected to the pull hook slot, and the other end is connected to the pull ring, so as to form a lever principle to pull the ejector pin to slide up and down in the ejector pin matching hole to form a switch valve. When the oil channel is opened, the fuel flows into the oil storage chamber through multiple oil dispersion holes, and the low-pressure electric pump shock absorber is horizontally placed in the lower housing and the low-pressure electric pump is covered. The oil outlet corrugated rubber head can be inserted into the oil outlet installation hole of the low-pressure electric pump, the pressure plate is pressed on the low-pressure electric pump shock absorber, and the low-pressure electric pump is fastened to the lower housing by screws passing through the pressure strip installation hole, and the throttle valve is installed into the throttle valve installation hole; Step 5. The sensor connector can be installed into the sensor connector mounting hole for fixing. The high-pressure electric pump can be placed above the small plastic round shell in the electric pump assembly or fault troubleshooting. The high-pressure electric pump oil outlet head is inserted into the high-pressure electric pump oil outlet mounting hole. The entire high-pressure electric pump is clamped upright inside the upper and lower shells. The high-pressure electric pump connector can be connected to the external connector. The oil outlet copper head is connected to the oil outlet copper head mounting hole to fix it. The oil pipe is fastened to the oil outlet copper head with a clamp to fix the oil pipe. The air connecting head is directly tightened in the threaded hole on the upper shell. The technical solution provided by the present invention: the working process is through the oil pump 2 and the secondary and tertiary electric booster pump 1, and two bolts can be used to fix the oil pump 2 on the housing of the secondary and tertiary electric booster pump 1, so that the oil pump 2 can be firmly fixed on the housing of the secondary and tertiary electric booster pump 1 for use, and the problem of the oil pump 2 loosening and falling off after the vibration occurs during the operation of the overall equipment, which makes the overall equipment unable to continue to operate, is reduced. The oil outlet connector 3 of the oil pump 2 is connected with the inlet of the temporary fuel storage chamber 24, so that the fuel can pass through the inside of the oil pump 2 and the fuel is filled into the temporary fuel storage chamber 24 for storage after obtaining a certain pressure inside the oil pump 2, which reduces the problem of the temporary fuel storage chamber 24 being unable to store the fuel inside the equipment. In order to solve the problem that the fuel in the tank is directly added to the fuel temporary storage chamber 24 and the fuel cannot be stored in the fuel temporary storage chamber 24 after it reaches a certain pressure, the fuel in the fuel tank is connected to the fuel delivery port 5 on the fuel pump 2 through the fuel hose, which can accurately add the fuel in the fuel tank to the fuel pump 2, reducing the problem of fuel spilling due to the shaking of the staff when adding the fuel to the fuel pump 2, and then the positive and negative pressure compressed air is alternately introduced into the A positive and negative pressure air interface 4 and the B positive and negative pressure air interface 6 through the positive and negative pressure compressed air alternately, which effectively utilizes the alternating positive and negative pressure air power to transport the fuel to the fuel temporary storage chamber 24 through the fuel pump 2, reducing the problem that the fuel inside the fuel pump 2 cannot be pressurized after the fuel is added to the fuel pump 2. The problem that the fuel cannot be quickly transported from the fuel pump 2 and the fuel hose to the temporary fuel storage chamber 24 is solved. The sealing strip 18 can be manually installed into the groove 26 in the lower shell 12, so as to effectively seal the interior of the entire device, reduce the problem of external air entering due to gaps at the edge of the entire device or the fuel in the temporary fuel storage chamber 24 spilling out of the entire device, and then use screws to fasten the upper shell 8 and the lower shell 12 together, which effectively fixes the upper shell 8 and the lower shell 12, and reduces the problem that the upper shell 8 and the lower shell 12 become loose after the entire device has been running for a long time, causing the entire device to be unable to operate normally. The filter element 7 can be manually screwed into the filter element mounting hole 31, so that the fuel can enter the oil storage chamber 25 after being filtered by the filter element 7, reducing the problem of reduced fuel quality during later use due to trace impurities attached to the fuel when it enters the fuel. The oil outlet transition head 13 is pressed into the oil outlet transition head mounting hole 33 through the mounting cylindrical surface 36, so that the oil outlet transition head 13 can be quickly and conveniently removed and fixed, reducing the problem of wasting the installation time of the entire equipment due to the inconvenient installation and removal of the oil outlet transition head 13 and reducing the shaking of the oil outlet transition head 13 during use. The cylindrical body 41 of the ejector pin 14 can be manually fitted into the ejector pin fitting hole 39 through the ejector pin 14.The ejector pin 14 is effectively fixed, and the problem of the ejector pin 14 loosening and falling during operation is reduced. The rubber cone head 40 can support the oil outlet channel 37, and the oil outlet channel 37 can be effectively blocked so that the entire device can block the fuel inside the entire device when it is not needed to discharge the fuel, thereby reducing the problem of oil leakage during the operation of the entire device. The plastic body 43 in the float assembly 15 can be suspended in the oil storage cavity 25 and connected to the upper shell 8 through the pull ring 44. One end of the hook 19 is connected to the hook slot 42, and the other end is connected to the pull ring 44. In this way, a lever principle is formed to pull the ejector pin 14 to slide up and down in the ejector pin matching hole 39 to form a switch valve. The hook 19 can be manually pulled out or inserted to switch the oil outlet channel 37. The oil channel has the following effect: when the oil passage is opened, the fuel flows into the oil storage chamber 25 through the multiple oil dispersion holes 38, so that the fuel can quickly flow into the oil storage chamber 25 in a dispersed state, reducing the problem of a long time for the fuel to flow into the oil storage chamber 25. The low-pressure electric pump shock absorber 47 is placed horizontally in the lower shell 12 and covers the low-pressure electric pump 17, which can effectively reduce the shock when the low-pressure electric pump 17 is running, reducing the problem of strong vibration when the low-pressure electric pump 17 is running inside the upper shell 8 and the lower shell 12. The oil outlet corrugated rubber head 49 can be inserted into the low-pressure electric pump oil outlet mounting hole 30, so that the fuel can be effectively added to the low-pressure electric pump 17, so that the fuel consumption of the low-pressure electric pump 17 after a long period of operation is reduced. The effect of being able to quickly replenish the interior after the low-pressure electric pump 17 is finally completed reduces the problem of having to stop the entire equipment from running before filling the low-pressure electric pump 17 with fuel after the low-pressure electric pump 17 is unable to operate due to insufficient oil volume during operation. The pressure plate 46 is pressed tightly against the low-pressure electric pump shock-absorbing body 47, achieving the effect of simultaneously shock-absorbing the low-pressure electric pump 17 together with the low-pressure electric pump shock-absorbing body 47, reducing the problem of the low-pressure electric pump 17 vibrating too much when the low-pressure electric pump shock-absorbing body 47 shock-absorbing the low-pressure electric pump 17 alone and being unable to shock it. The low-pressure electric pump 17 is fastened to the lower housing 12 by screws passing through the pressure strip mounting holes 45, which has the effect of fixing the low-pressure electric pump 17, reducing the problem of the low-pressure electric pump 17 being unable to shock it when the entire equipment is running for a long time. The problem of loosening and falling occurs. The copper sheet 48 can be connected to the external connector to achieve the effect of quickly providing power to the low-voltage electric pump 17, reducing the problem of the low-voltage electric pump 17 stopping operation due to the failure to power the low-voltage electric pump 17. The small plastic round shell 22 is placed inside the small plastic round shell placement hole 27, which has the effect of fixing the small plastic round shell 22. The arc surface 53 is opposite to the oil outlet end of the low-pressure electric pump, and the small plastic round shell oil return hole 55 is opposite to the oil return installation hole 56, which makes the inflowing fuel flow up to the inside of the small plastic round shell 22 through the bottom oil hole 54, providing fuel for the high-pressure electric pump 20, and reducing the problem that the inflowing fuel cannot enter the inside of the small plastic round shell 22.The throttle valve 23 is installed in the throttle valve mounting hole 29, which has the effect of fixing the throttle valve 23 and facilitating the excess fuel to flow back into the oil storage chamber 25, thereby reducing the problem that the excess fuel cannot flow back into the oil storage chamber 25 and remains inside the overall equipment and cannot be discharged or stored. The sensor connector 21 can be installed in the sensor connector mounting hole 28 for fixing, thereby achieving the effect of facilitating debugging or troubleshooting of the electric pump assembly or troubleshooting from an external sensor, thereby reducing the problem that the electric pump assembly cannot be repaired or troubleshooted when it fails. The high-pressure electric pump 20 is placed above the small plastic round shell 22, and the high-pressure electric pump oil outlet head 5 0 is inserted into the oil outlet mounting hole 35 of the high-pressure electric pump. The entire high-pressure electric pump 20 is clamped upright inside the upper and lower shells, which can effectively fix it and enable its buffer body 52 to buffer oil pressure fluctuations. The high-pressure electric pump connector 51 can be connected to an external connector, which is convenient for providing power to the high-pressure electric pump 20 so that it can be used for a long time, reducing the problem that the high-pressure electric pump 20 cannot be used for a long time due to the inability to provide power to the high-pressure electric pump 20 for a long time. The oil outlet copper head 10 is connected to the oil outlet copper head mounting hole 34 to fix it. The oil pipe 11 is fastened to the oil outlet copper head 10 with a clamp to fix the oil pipe 11. The air connecting head 9 is directly tightened in the threaded hole on the upper shell 8. ,

[0037] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly, characterized in that: The invention comprises a two-stage or three-stage electric booster pump (1), one side of the two-stage or three-stage electric booster pump (1) is penetrated by an oil delivery pump (2) through a bolt thread, the upper surface of the oil delivery pump (2) is plugged with an oil outlet joint (3), one side of the oil delivery pump (2) is plugged with an A positive and negative pressure air interface (4), the upper surface of the oil delivery pump (2) is plugged with an oil delivery port (5), one side of the oil delivery pump (2) is provided with a B positive and negative pressure air interface (6), a filter element (7) is provided inside the two-stage or three-stage electric booster pump (1), an upper shell (8) is plugged with the upper surface of the two-stage or three-stage electric booster pump (1), an air connecting head (9) is plugged with the upper surface of the two-stage or three-stage electric booster pump (1), and an oil outlet copper head is provided on the upper surface of the two-stage or three-stage electric booster pump (1). (10), an oil pipe (11) is inserted into the interior of the second and third stage electric booster pump (1), a lower shell (12) is inserted into the lower surface of the second and third stage electric booster pump (1), an oil outlet transition joint (13) is provided inside the second and third stage electric booster pump (1), a ejector pin (14) is provided inside the second and third stage electric booster pump (1), a float assembly (15) is provided inside the second and third stage electric booster pump (1), a pressure strip (16) is provided inside the second and third stage electric booster pump (1), a low-pressure electric pump (17) is inserted into the interior of the second and third stage electric booster pump (1), a sealing strip (18) is sleeved on one side of the second and third stage electric booster pump (1), and a draw hook (19) is provided inside the second and third stage electric booster pump (1), A high-pressure electric pump (20) is plugged into the interior of the second- or third-stage electric booster pump (1), a sensor connector (21) is plugged into one side of the second- or third-stage electric booster pump (1), a small plastic round shell (22) is plugged into one side of the second- or third-stage electric booster pump (1), a throttle valve (23) is plugged into the interior of the second- or third-stage electric booster pump (1), a temporary fuel storage chamber (24) is provided inside the lower shell (12), an oil storage chamber (25) is provided inside the lower shell (12), a groove (26) is provided inside the lower shell (12), a small plastic round shell placement hole (27) is provided inside the lower shell (12), a sensor connector mounting hole (28) is provided inside the lower shell (12), and a fuel tank (24) is provided inside the lower shell (12). A throttle valve mounting hole (29) is provided inside the lower housing (12), a low-pressure electric pump oil outlet mounting hole (30) is provided inside the upper housing (8), a filter element mounting hole (31) is provided inside the upper housing (8), a passage (32) is provided inside the upper housing (8), an oil outlet transition head mounting hole (33) is provided inside the upper housing (8), an oil outlet copper head mounting hole (34) is provided inside the upper housing (8), a high-pressure electric pump oil outlet mounting hole (35) is provided inside the upper housing (8), a mounting cylindrical surface (36) is inserted on the upper surface of the oil outlet transition head (13), an oil outlet passage (37) is provided inside the oil outlet transition head (13), and a plurality of oil dispersion holes (38) are provided inside the oil outlet transition head (13).The oil outlet transition head (13) is provided with an ejector pin fitting hole (39) inside.

2. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1 is characterized in that: A rubber cone head (40) is inserted into the upper surface of the ejector pin (14); one end of the rubber cone head (40) can penetrate the cylinder (41) and be connected to the ejector pin (14); the surface of the ejector pin (14) is sleeved with the cylinder (41); both ends of the cylinder (41) are provided with insertion holes, into which the rubber cone head (40) and the hook (19) can be inserted respectively; a hook slot (42) is provided on the lower surface of the ejector pin (14); and the lower surface of the hook slot (42) is provided.

3. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1 is characterized in that: A plastic body (43) is sleeved on the surface of the float assembly (15); the plastic body (43) has the same shape as the float assembly (15) and is capable of covering the float assembly (15); a pull ring (44) is provided on one side of the float assembly (15); a circular ring structure is provided at one end of the pull ring (44); and a long protruding object is provided on the surface of the circular ring structure.

4. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: A pressure strip installation hole (45) is provided on one side of the pressure strip (16), and the pressure strip installation holes (45) are two in number and are distributed on both sides of the pressure strip (16). A pressing plate (46) is inserted on one side of the pressure strip (16), and the pressing plate (46) is in the shape of a protruding long strip.

5. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: A low-pressure electric pump shock-absorbing body (47) is provided on the surface of the low-pressure electric pump (17), and the low-pressure electric pump shock-absorbing body (47) can fully cover the low-pressure electric pump (17) and reduce shock; a plug-in copper sheet (48) is provided on one side of the low-pressure electric pump (17), and two docking holes are provided on the surface of the plug-in copper sheet (48) from left to right, and one docking hole can be connected to the low-pressure electric pump (17) and the other can be connected to an external connector.

6. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: An oil outlet corrugated rubber head (49) is sleeved on one side of the low-pressure electric pump (17), and a relatively thick circular blocking object is provided on one end of the oil outlet corrugated rubber head (49).

7. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: A high-pressure electric pump oil outlet head (50) is provided at one end of the high-pressure electric pump (20); the upper circular shape of the high-pressure electric pump oil outlet head (50) is smaller, and the lower circular shape is larger.

8. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: A high-voltage electric pump connector (51) is provided at one end of the high-voltage electric pump (20), the high-voltage electric pump connector (51) being located on the upper surface of the high-voltage electric pump (20) and being connectable to an external connector, a buffer body (52) being sleeved on the surface of the high-voltage electric pump (20), the buffer body (52) being located on the lower outer surface of the high-voltage electric pump (20), the high-voltage electric pump (20) being circular in shape and corresponding to the surface of the high-voltage electric pump (20).

9. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: The inside of the small plastic round shell (22) is provided with an arc surface (53), the arc surface (53) is located at a lower part of one side of the small plastic round shell (22), the inside of the small plastic round shell (22) is an arc shape corresponding to the arc surface (53), and the bottom surface of the small plastic round shell (22) is provided with a bottom oil hole (54).

10. The multi-fuel electromechanical three-stage coupled step-by-step booster pump assembly according to claim 1, characterized in that: A plastic small round shell oil return hole (55) is provided on one side of the plastic small round shell (22), and a plastic small round shell oil return hole (55) is provided on the other side of the plastic small round shell (22). The plastic small round shell oil return hole (55) does not penetrate the plastic small round shell (22), and an oil return mounting hole (56) is provided inside the lower shell (12).

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