Universal engine fuel supply device

Abstract

The utility model discloses a general engine fuel supply device, including engine body, and set up on the engine body fuel pump, fuel pump is used for guiding to engine body with fuel, be provided with pressure input on fuel pump, be provided with pressure tapping on the engine body, and pressure input and pressure tapping communicate through pressure delivery pipe, the horizontal height of pressure input is higher than pressure tapping, be provided with U type bending section on pressure delivery pipe. Advantageous effect lies in: through the modularization design of fuel pump installation, the layout of the component is clear and reasonable, and the connecting node is less, and the fuel transmission component is not easy to fall off or fail under the environment of high temperature and high load, and the pressure in fuel pump can be kept stable through the pressure tapping from the engine body, and the pressure fluctuation is also smaller under high temperature and high load, and the safety and reliability of fuel transmission are greatly improved, in addition, the installation and maintenance are more convenient.

Description

Technical Field

[0001] This utility model relates to the field of general engine technology, specifically to a general engine fuel supply device. Background Technology

[0002] With the development of technology, general engine technology is also constantly being innovated. Among them, the fuel supply device is the core component of the power system. Its development history is deeply linked to the technological iteration of the automotive industry, the upgrading of environmental regulations, and the transformation of energy structure. It has roughly gone through three major stages: mechanical drive, electronic control, and intelligent integration. Currently, it is evolving towards adapting to new energy and multi-scenario applications.

[0003] CN108457778A discloses a fuel supply device in which a throttle body equipped with an injector and a throttle valve is disposed between the intake manifold and the air filter of a two-cylinder universal engine. Fuel adjusted to a predetermined air-fuel ratio is supplied to the two cylinders of the two-cylinder universal engine through an injector. The fuel supply device is characterized in that the throttle body is composed of a fuel supply section with an injector and an air quantity control section with a throttle valve, and the fuel supply section and the air quantity control section are composed of independent components that can be separated and combined. In this way, the injector-containing part and the throttle valve-containing part of the FI-type fuel supply device are composed of independent components that can be separated and combined. This allows for the interchangeability of the injector-side or throttle valve-side components depending on the type of general-purpose engine to be used, making it easy to adapt to the engine to be used. Therefore, compared to the case of preparing all types of fuel supply devices with integrated mechanical or electronically controlled throttle valves that have different forms according to the type of general-purpose engine and correspond to the intake manifold and air filter respectively, the fuel injection system can be adapted to a variety of general-purpose engines at a low manufacturing cost.

[0004] This solution is suitable for a variety of application scenarios, but its structure is relatively complex. In order to reduce the cost of adapting to multiple scenarios, it sacrifices the control precision of the entire process from fuel injection to entering the cylinder, resulting in unstable fuel transmission under high temperature and high load conditions. Especially when the engine operating conditions change suddenly (such as rapid acceleration or deceleration), this delay will lead to lag in power response or speed fluctuation.

[0005] For example, Chinese patent document CN201635832U discloses a general-purpose engine comprising: an engine body; a carburetor disposed on the upper side of the engine body to form a gas mixture; and a fuel tank disposed on the upper side of the engine body. The engine is characterized by having: a first fuel outlet formed at one end of the bottom wall of the fuel tank; a second fuel outlet formed at the other end of the bottom wall of the fuel tank; a first fuel supply pipe supplying fuel from the first fuel outlet to the carburetor; and a second fuel supply pipe supplying fuel from the second fuel outlet to the carburetor. The general-purpose engine of this invention is characterized in that the first fuel outlet is formed on one side of the fuel tank in the longitudinal direction, and the second fuel outlet is formed on the other side of the fuel tank in the longitudinal direction. The general-purpose engine of this utility model is characterized in that a fuel filter is disposed below the first fuel outlet and near the lower side of the engine body, and the first fuel supply pipe has: an upstream piping section connected between the fuel outlet and the fuel filter; and a downstream piping section connected between the fuel filter and the carburetor, wherein fuel flowing out of the first fuel outlet is filtered by the fuel filter and supplied to the carburetor.

[0006] The solution uses a dual-pipeline (V-shaped + Y-shaped) design to address the fuel transfer problem when tilted. However, the reliability of fuel transfer depends on the coordinated operation of the pipeline, interface, and seals. The dual-pipeline design significantly increases the probability of failure due to the increased number of nodes, especially under high temperature and high load conditions, where the reliability of fuel transfer is poor. Utility Model Content

[0007] The purpose of this invention is to provide a universal engine fuel supply device that can deliver fuel safely and reliably under high temperature and high load conditions, while also being easy to assemble.

[0008] To achieve the above objectives, the basic solution of this utility model provides a universal engine fuel supply device, including an engine body and a fuel pump installed on the engine body. The fuel pump is used to guide fuel to the engine body. The fuel pump is provided with a pressure input port, and the engine body is provided with a pressure tapping port. The pressure input port and the pressure tapping port are connected through a pressure delivery pipe.

[0009] The advantages of this basic solution are as follows: the modular design of the fuel pump installation makes the layout between components clear and reasonable, with fewer connection nodes, and the fuel transmission components are not easy to fall off or fail in high temperature and high load environments; and by taking pressure from the engine body through the pressure tap, the pressure inside the fuel pump can be kept stable, and the pressure fluctuation is also small under high temperature and high load, which greatly improves the safety and reliability of fuel transmission; in addition, installation and maintenance are relatively convenient.

[0010] Preferably, the horizontal height of the pressure input port is higher than that of the pressure tapping port. This gravity-adaptive layout prevents lubricating oil from entering the fuel pump, reducing the risk of fuel pump failure in high-temperature, high-load environments and ensuring safe and reliable fuel delivery.

[0011] Preferably, the pressure delivery pipe is provided with a U-shaped bend. The bend forms a labyrinth structure, which can further buffer or block lubricating oil from entering the fuel pump, reduce the risk of fuel pump failure, and ensure safe and reliable transmission.

[0012] Preferably, the fuel pump is further provided with a fuel supply inlet and a fuel supply outlet. The fuel supply inlet draws in fuel through a first fuel pipe, and the fuel supply outlet guides the fuel to the engine block through a second fuel pipe.

[0013] Preferably, the engine block is provided with an oil-gas mixing device, and the two ends of the second fuel pipe are respectively connected to the fuel supply outlet and the oil-gas mixing device.

[0014] Preferably, the fuel supply outlet is positioned higher than the oil-gas mixing device. By oriented the fuel supply outlet at a high level, gravity is utilized to improve transport efficiency and ensure reliable transmission.

[0015] Preferably, the opening of the fuel supply outlet is oriented towards the oil-gas mixing device. This improves fuel transfer smoothness, ensures transfer safety, and effectively reduces fuel accumulation within the fuel pump.

[0016] Preferably, the opening of the fuel supply inlet is oriented towards the direction of gravity. This arrangement effectively reduces fuel accumulation in the fuel pump, preventing fuel from being introduced into the fuel pump during engine shutdown and causing machine malfunction or failure.

[0017] Preferably, a fuel filter is provided on the first fuel pipe. This arrangement reduces the risk of malfunctions in components such as the fuel pump due to fuel impurities, ensuring safe fuel delivery.

[0018] Preferably, the engine block is further provided with a wind deflector, and the fuel pump is mounted on the wind deflector. Mounting the fuel pump on the wind deflector reduces the mutual interference between the fuel pump and the engine, improves the stability of the fuel pump under high temperature and high load conditions, and facilitates installation and maintenance.

[0019] This utility model has the following beneficial effects: 1. The modular design of the fuel pump installation makes the layout between components clear and reasonable, with fewer connection nodes; and the pressure is taken from inside the engine block, which can ensure stable pressure inside the fuel pump; the above arrangement can effectively avoid fuel supply deviation caused by component failure or pressure fluctuation under high temperature and high load environment, and greatly improve the safety and reliability of fuel transmission.

[0020] 2. The optimized modular design and layout are clear and reasonable, with fewer connection nodes, making installation and maintenance more convenient and reducing costs. Attached Figure Description

[0021] Figure 1 This is a three-dimensional isometric view of Embodiment 1 of this utility model.

[0022] Figure 2 This is a structural diagram of the fuel pump in Embodiment 1 of this utility model. Detailed Implementation

[0023] The "pressure input port", "pressure delivery pipe" and "pressure tapping port" involved in this utility model are used together to collect pressure from inside the engine block and maintain stable pressure inside the fuel pump.

[0024] The "gravity direction" involved in this utility model is generally the vertically downward direction pointing towards the center of the earth.

[0025] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1-engine body, 2-oil-gas mixing device, 3-second fuel pipe, 4-fuel supply outlet, 5-fuel pump, 6-fuel supply inlet, 7-air guide shroud, 8-pressure input port, 9-fuel filter, 10-first fuel pipe, 11-pressure delivery pipe, 12-pressure tap.

[0026] The universal engine fuel supply device provided by this utility model includes an engine body 1 and a fuel pump 5 installed on the engine body 1. The fuel pump 5 is used to guide fuel to the engine body 1. The fuel pump 5 is provided with a pressure input port 8, and the engine body 1 is provided with a pressure tapping port 12. The pressure input port 8 and the pressure tapping port 12 are connected through a pressure delivery pipe 11.

[0027] Even better, the horizontal height of pressure input port 8 is higher than that of pressure tap 12.

[0028] Even better, the pressure delivery pipe 11 is provided with a U-shaped bend.

[0029] Even better, the fuel pump 5 is also provided with a fuel supply inlet 6 and a fuel supply outlet 4. The fuel supply inlet 6 draws in fuel through the first fuel pipe 10, and the fuel supply outlet 4 guides the fuel to the engine block 1 through the second fuel pipe 3.

[0030] As one preferred embodiment, the pressure input port 8, the pressure delivery pipe 11, and the pressure tap 12 work together to draw negative pressure from the crankcase inside the engine block 1 to maintain the negative pressure state inside the fuel pump 5, and to draw fuel into the fuel pump 5 through the first fuel pipe 10.

[0031] Even better, the engine block 1 is equipped with an oil-gas mixing device 2, and the two ends of the second fuel pipe 3 are respectively connected to the fuel supply outlet 4 and the oil-gas mixing device 2, that is, one end of the second fuel pipe 3 is connected to the fuel supply outlet 4, and the other end is connected to the oil-gas mixing device 2.

[0032] Even better, the fuel supply outlet 4 is positioned at a higher level than the oil and gas mixing unit 2.

[0033] Even better, the opening of the fuel supply outlet 4 is oriented toward the oil-gas mixing device 2.

[0034] Even better, the opening of the fuel supply inlet 6 is oriented towards the direction of gravity.

[0035] Even better, a fuel filter 9 is provided on the first fuel pipe 10.

[0036] Even better, the engine block 1 is also equipped with a wind deflector 7, and the fuel pump 5 is mounted on the wind deflector 7.

[0037] Even better, the horizontal height of the pressure tap 12 is lower than that of the oil-gas mixing device 2.

[0038] The basic implementation examples are as follows: Figure 1-2 As shown: The universal engine fuel supply device provided in this embodiment consists of an engine block 1, and an air guide shroud 7, a fuel pump 5, an oil-gas mixing device 2, and a pressure tap 12 disposed on the engine block 1. The fuel pump 5 is used to guide fuel to the oil-gas mixing device 2 and into the engine block 1.

[0039] Preferably, the air guide shroud 7 is located at one end of the engine block 1. More preferably, the air guide shroud 7 consists of an air intake surface and side walls arranged circumferentially around the air intake surface, and the fuel pump 5 is mounted on the air guide shroud 7 by a mounting component. Preferably, the fuel pump 5 is mounted on the side wall of the air guide shroud 7 to maximize the isolation of the heat-generating components inside the engine block 1 from the thermal impact on the fuel pump 5.

[0040] The fuel pump 5 is equipped with a pressure input port 8, a fuel supply inlet 6, and a fuel supply outlet 4. The pressure input port 8 and the pressure tap 12 are connected through a pressure delivery pipe 11.

[0041] Fuel supply inlet 6 draws in fuel through first fuel pipe 10; fuel supply outlet 4 is connected to oil-gas mixing device 2 through second fuel pipe 3, that is, one end of second fuel pipe 3 is connected to fuel supply outlet 4, and the other end is connected to oil-gas mixing device 2.

[0042] Furthermore, a fuel filter 9 is installed on the first fuel pipe 10 to filter the fuel being drawn in, preventing impurities in the fuel from interfering with the fuel delivery pipeline and components.

[0043] The pressure input port 8, pressure delivery pipe 11, and pressure tap 12 work together to draw negative pressure from the crankcase inside the engine block 1 to maintain a negative pressure state inside the fuel pump 5, so that fuel is drawn into the fuel pump 5 through the first fuel pipe 10.

[0044] The horizontal height of pressure input port 8 is higher than that of pressure tap 12; The pressure delivery pipe 11 is provided with a U-shaped bend as a buffer or barrier.

[0045] The fuel supply outlet 4 is positioned higher than the oil and gas mixing unit 2; by directionally positioning the fuel supply outlet 4 at a high level, gravity is used to improve the conveying efficiency and ensure the reliability of the transmission.

[0046] Furthermore, the opening of the fuel supply outlet 4 is oriented towards the oil-gas mixing device 2. This improves the smoothness of fuel transmission, ensures transmission safety, and effectively reduces fuel accumulation within the fuel pump 5.

[0047] The opening of the fuel supply inlet 6 is oriented vertically downwards towards the center of the earth. This design effectively reduces fuel accumulation in the fuel pump 5, preventing fuel from being introduced into the fuel pump 5 during engine shutdown and causing machine malfunction.

[0048] The specific implementation process is as follows: After the fuel pump 5 is started, the pressure input port 8, the pressure delivery pipe 11 and the pressure tap 12 cooperate to draw negative pressure from the crankcase inside the engine block 1 to maintain the negative pressure state inside the fuel pump 5. The fuel is drawn in and enters the fuel filter 9 through the first fuel pipe 10 for filtration. The filtered fuel then goes from the first fuel pipe 10 to the fuel supply inlet 6, then enters the fuel pump 5, then reaches the fuel supply outlet 4, and then enters the engine block 1 through the second fuel pipe 3 and the oil-air mixing device 2.

[0049] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics of the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A universal engine fuel supply device, comprising an engine block and a fuel pump disposed on the engine block, the fuel pump being used to guide fuel to the engine block; characterized in that: The fuel pump is provided with a pressure input port, and the engine block is provided with a pressure tapping port. The pressure input port and the pressure tapping port are connected by a pressure transmission pipe.

2. The universal engine fuel supply device according to claim 1, characterized in that: The horizontal height of the pressure input port is higher than that of the pressure tapping port.

3. The universal engine fuel supply device according to claim 2, characterized in that: The pressure conveying pipe is provided with a U-shaped bend.

4. The universal engine fuel supply device according to any one of claims 1-3, characterized in that: The fuel pump is also provided with a fuel supply inlet and a fuel supply outlet. The fuel supply inlet draws in fuel through a first fuel pipe, and the fuel supply outlet guides the fuel to the engine block through a second fuel pipe.

5. The universal engine fuel supply device according to claim 4, characterized in that: The engine block is equipped with an oil-gas mixing device, and the two ends of the second fuel pipe are respectively connected to the fuel supply outlet and the oil-gas mixing device.

6. The universal engine fuel supply device according to claim 5, characterized in that: The fuel supply outlet is at a higher level than the oil-gas mixing device.

7. The universal engine fuel supply device according to claim 6, characterized in that: The opening of the fuel supply outlet is oriented toward the oil-gas mixing device.

8. The universal engine fuel supply device according to claim 7, characterized in that: The opening of the fuel supply inlet is oriented towards the direction of gravity.

9. The universal engine fuel supply device according to any one of claims 5-8, characterized in that: A fuel filter is installed on the first fuel pipe.

10. The universal engine fuel supply device according to claim 9, characterized in that: The engine block is also equipped with an air guide shroud, and the fuel pump is mounted on the air guide shroud.

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