An integrated oil-gas mixed electronic injection valve for a fire pump two-stroke engine

Abstract

The utility model relates to an integrated oil gas mixed electronic injection valve for fire pump two -stroke engine, it includes electronic injection valve body, the inside of electronic injection valve body is opened with main gas channel and fuel passage, the rotation is connected with throttle main shaft in electronic injection valve body, throttle main shaft installs throttle valve spring piece on, throttle main shaft still installs throttle position sensor, electronic injection valve body installs electromagnetic fuel atomizer, the electromagnetic fuel atomizer with fuel passage intercommunication, and located main gas channel's top rear, throttle position sensor with electromagnetic fuel atomizer all with electronic control unit ECU signal connection, electronic control unit ECU is used for according to throttle position sensor's electric signal control electromagnetic fuel atomizer's oil injection amount. The utility model has the effect that control precision, compact structure, good adaptability, promote engine's power response, fuel economy and in the working reliability under the harsh environment.

Description

Technical Field

[0001] This utility model relates to the field of fuel injection technology for two-stroke engines, and in particular to an integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump. Background Technology

[0002] Portable fire pumps generally use two-stroke engines as their power source, and their traditional fuel supply method mainly relies on mechanical carburetors. As a classic device of the mechanical age, the carburetor draws fuel out and mixes it with air through intake vacuum. This principle inherently leads to inaccuracies in mixture concentration control, slow response, and instability in fuel supply due to changes in equipment posture. Under the complex and variable conditions of firefighting operations, traditional carburetors struggle to guarantee the optimal fuel-air mixture concentration under various loads and speeds. This not only results in low engine efficiency and increased emissions but also increases the risk of engine stalling during sudden load changes, directly impacting the reliability of firefighting operations.

[0003] Furthermore, existing technologies have attempted to transplant electronic fuel injection technology from four-stroke engines to two-stroke engines, typically employing a separate throttle body and injector on the intake manifold. However, this separate approach suffers from problems such as poor mixing, system complexity, high cost, and stringent control coordination requirements. Specifically, existing technologies have the following drawbacks: First, when a two-stroke gasoline engine equipped with a mechanical carburetor operates in high-altitude or low-temperature environments, the carburetor casing is prone to frost formation, a sharp drop in engine power, or even engine shutdown. Second, mechanical carburetors suffer from maintenance difficulties and performance defects such as diaphragm aging, inlet channel blockage, needle valve adhesion, and poor starting performance and idling stability. Third, the starting process is complex, often requiring cold starts and engine warm-up, and the fuel-air mixture ratio is difficult to adjust precisely to the optimal state.

[0004] Therefore, there is an urgent need in the field for an integrated fuel supply device that can provide a highly uniform air-fuel mixture for two-stroke engines, and is compact and precisely controlled. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump, which has the effects of precise control, compact structure, good adaptability, and improves the engine's power response, fuel economy and working reliability in harsh environments.

[0006] The above-mentioned utility model objective is achieved through the following technical solution:

[0007] An integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump, comprising an electronic injection valve body,

[0008] The electronic fuel injection valve body has a main air passage and a fuel passage inside, and a throttle valve spindle is rotatably connected inside the electronic fuel injection valve body;

[0009] A throttle valve spring is installed on the throttle valve spindle to cut off or open the airflow in the main air passage.

[0010] A throttle position sensor is also installed on the throttle body spindle;

[0011] An electromagnetic fuel injector is installed on the electronic fuel injection valve body. The electromagnetic fuel injector is connected to the fuel passage and is located above and behind the main air passage.

[0012] Both the throttle position sensor and the electromagnetic fuel injector are connected to the electronic control unit (ECU) via signal transmission. The ECU controls the fuel injection quantity of the electromagnetic fuel injector based on the electrical signal from the throttle position sensor.

[0013] The above technical solution integrates intake regulation and fuel injection functions into a single valve body, achieving a compact structure and simplifying the engine intake manifold layout. Simultaneously, the ECU precisely controls the fuel injection quantity based on the throttle opening, fundamentally solving the problems of inaccurate air-fuel mixture control, poor environmental adaptability, and slow response inherent in traditional carburetors. This ensures the engine obtains the optimal air-fuel ratio under various operating conditions, thereby improving efficiency and reducing emissions and fuel consumption.

[0014] As a further technical solution of this utility model: an idle flow channel is provided in the body of the electronic fuel injection valve, which is connected in parallel with the main air passage.

[0015] The above technical solution provides an idle air passage independent of the main intake manifold, providing a stable air source for engine idling and extremely low load conditions. This effectively solves the problem of idle vibration and easy stalling caused by unstable intake when the throttle valve is close to closing in traditional carburetors, and significantly improves idle stability and reliability.

[0016] As a further technical solution of this utility model: an idle speed limit adjustment screw is provided on the idle speed flow channel to adjust the air flow under idle conditions.

[0017] The above technical solution allows for precise adjustment of the airflow in the idle flow channel using the idle speed limit adjustment screw. This enables the engine to finely match the required air-fuel mixture for idling according to different conditions and environments, further optimizing idle stability and emission performance. The adjustment method is also simple and reliable.

[0018] As a further technical solution of this utility model: a throttle limit vane is provided on the throttle valve main shaft.

[0019] Through the above technical solution, the throttle limiter can mechanically limit the maximum opening of the throttle valve, prevent mechanical damage or engine overspeed caused by excessive valve opening, enhance system safety, extend service life, and provide a benchmark for debugging different power requirements.

[0020] As a further technical solution of this utility model: the air inlet end of the electronic fuel injection valve body is provided with an interface for installing an air filter, and its air outlet end is provided with a mounting bracket for connecting to the air inlet of the engine crankcase.

[0021] Through the above technical solutions, the integrated interface and mounting bracket enable the electronic fuel injection valve to be connected quickly and reliably to the air filter and engine crankcase as an independent module, simplifying the overall assembly process, ensuring the sealing of the intake pipeline, and improving the overall integration and reliability of the system.

[0022] As a further technical solution of this utility model: one end of the fuel passage is connected to the fuel inlet, and the other end is connected to the fuel inlet of the electromagnetic fuel injector.

[0023] By integrating the fuel passage inside the valve body and embedding the fuel supply path, the number of external oil pipe connections and the potential leakage risks are reduced, making the system structure more compact and the layout simpler, thus improving the reliability and space utilization of the fuel supply system.

[0024] As a further technical solution of this utility model: the nozzle direction of the electromagnetic fuel injector forms an acute angle with the airflow direction of the main air passage.

[0025] With the above technical solution, the fuel injection direction forms an acute angle with the intake airflow, which can make full use of the airflow energy to more fully shear and break up the fuel jet, greatly promoting fuel atomization and evaporation, thereby forming a more uniform fuel-air mixture, and ultimately achieving more complete combustion, thus achieving the dual effects of improving power, reducing fuel consumption and reducing emissions.

[0026] In summary, this utility model has at least one of the following beneficial technical effects:

[0027] 1. This utility model discloses an integrated oil-air mixture electronic injection valve for a two-stroke engine of a fire pump. By integrating intake air regulation and fuel injection functions into a single valve body and introducing electronic control coordination, it achieves precise and rapid response control of the oil-air mixture ratio, fundamentally improving the engine's efficiency, stability, and environmental adaptability.

[0028] 2. This utility model discloses an integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump. By setting up parallel idle flow channels and optimizing the injector spray angle, it achieves stable air supply and highly atomized fuel for the engine under both idling and full operating conditions, thereby significantly improving idling smoothness, combustion completeness, and power emission performance.

[0029] 3. This utility model discloses an integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump. By integrating an installation interface and a built-in fuel passage on the valve body, the electronic injection valve is modularized and compacted, which greatly simplifies the external pipeline connection and improves the system's sealing reliability, space utilization and overall assembly efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to the present invention.

[0031] Figure 2 This is a cross-sectional view of an embodiment of the integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to the present invention.

[0032] Figure 3 This is a left sectional view of an embodiment of the integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to the present invention.

[0033] Figure 4 This is a rear view of an embodiment of the integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to the present invention.

[0034] Reference numerals in the attached diagram: 1. Electromagnetic fuel injector; 2. Mounting bracket; 3. Throttle position sensor; 4. Electronic fuel injection valve body; 5. Throttle limit rotor; 6. Main intake manifold; 7. Throttle spring; 8. Idle flow path; 9. Idle limit adjustment screw; 10. Throttle spindle. Detailed Implementation

[0035] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Example 1:

[0039] Reference Figure 1 This utility model discloses an integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump. The integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump includes an electronic injection valve body 4. The electronic injection valve body 4 serves as an integral structural carrier and has two core passages inside: one is a main air passage 6 for air circulation, which undertakes the main air intake task under non-idle conditions of the engine (such as medium and high loads and rapid acceleration during fire fighting) to ensure stable air delivery; the other is a fuel passage for fuel delivery, which provides a closed and stable path for fuel to be supplied from the outside to the injection components, avoiding the leakage risk of traditional external oil pipe connections.

[0040] Reference Figure 1 and Figure 2 The intake end of the electronic fuel injection valve body 4 is provided with an interface for installing an air filter, which can filter dust and impurities in the air entering the main air passage 6, preventing impurities from clogging the main air passage 6, fuel passage or wearing internal engine components; its exhaust end is provided with a mounting bracket 2, which has a matching connection hole, enabling a quick and sealed connection with the air intake port of the engine crankcase, greatly simplifying the overall assembly process and ensuring the airtightness of the intake passage.

[0041] Reference Figure 2In terms of the intake regulation function, a throttle body spindle 10 is rotatably connected inside the electronic fuel injection valve body 4. The throttle body spindle 10 is located at the center of the electronic fuel injection valve body 4 and runs horizontally through the entire electronic fuel injection valve body 4. A sealed bearing is installed at the connection between the spindle and the valve body. The sealed bearing can not only reduce the rotational friction between the throttle body spindle 10 and the electronic fuel injection valve body 4 and extend the service life of the components, but also prevent the air in the main air passage 6 from leaking from the connection gap, thus ensuring the accuracy of intake volume control.

[0042] Reference Figure 1 , Figure 3 The throttle spindle 10 integrates three key components: first, the throttle spring 7, located inside the main intake manifold 6, changes the opening angle by rotating the throttle spindle 10, directly cutting off or opening the airflow in the main intake manifold 6, thus precisely adapting to the intake requirements of the engine under different loads; second, the throttle position sensor 3, which can collect the opening position information of the throttle spindle 10 in real time and convert this information into an electrical signal to be transmitted to the electronic control unit (ECU), providing accurate intake condition basis for fuel injection control; and third, the throttle limit rotor 5, which, through mechanical limiting cooperation with the outer wall of the electronic fuel injection valve body 4, can limit the maximum rotation angle of the throttle spindle 10, preventing engine overspeeding or mechanical damage to related components due to excessive opening of the throttle spring 7, thereby improving system safety.

[0043] Reference Figure 1 In terms of fuel injection and air-fuel mixing, an electromagnetic injector 1 is installed on the electronic fuel injection valve body 4. This electromagnetic injector 1 is connected to the fuel passage and located above and behind the main air passage 6, ensuring that fuel can be directly injected into the main air passage 6 to mix with air. One end of the fuel passage is connected to an external fuel inlet, and the other end is connected to the fuel inlet of the electromagnetic injector 1, forming a complete fuel supply chain of "external fuel supply - passage delivery - injector injection", ensuring the stability and continuity of fuel delivery. At the same time, the nozzle direction of the electromagnetic injector 1 forms an acute angle with the airflow direction in the main air passage 6, preferably 45° in this embodiment. This angle design can fully utilize the kinetic energy of the airflow in the main air passage 6 to strongly shear and break up the fuel jet sprayed by the injector, greatly promoting fuel atomization and evaporation, significantly improving the uniformity of air-fuel mixing, and laying the foundation for complete combustion in the engine.

[0044] Reference Figure 3 To address the stable idling requirements of the engine, the electronic fuel injection valve body 4 also features an idle flow passage 8 connected in parallel with the main intake manifold 6. When the engine is idling (e.g., after starting and while in standby, or maintaining low speed), the throttle valve spring 7 will nearly close the main intake manifold 6. At this time, the idle flow passage 8 can function as an independent intake path, providing a stable supplementary intake for the engine and preventing idling vibration or stalling due to insufficient intake. (Refer to...) Figure 4To further optimize the accuracy of idle speed control, an idle speed limit adjustment screw 9 is provided on the idle speed flow channel 8. By screwing in or out of this screw, the effective diameter of the idle speed flow channel 8 can be changed, thereby accurately controlling the air flow under idle conditions. This allows the engine to adapt to the idle speed requirements of different environments (such as low temperature and high altitude), improving idle speed stability and emission performance.

[0045] Through the above structural design, this solution highly integrates functions such as intake regulation, fuel injection, and idle speed control into a single electronic fuel injection valve body 4. This not only significantly simplifies the layout of the engine intake manifold, reduces the number of parts and potential leakage points, and improves system reliability and space utilization, but also enables the ECU to accurately control the fuel injection quantity of the electromagnetic fuel injector 1 in real time based on the throttle position sensor 3 and the ECU signal linkage through signal linkage. This solves the defects of traditional carburetor mixture concentration control being inaccurate and having poor environmental adaptability, as well as the defects of separate electronic fuel injection systems having poor mixing effect and complex control coordination. This ensures that the two-stroke engine of the fire pump can obtain the best air-fuel mixture under various complex operating conditions, achieving the dual effects of energy saving and emission reduction and enhanced power.

[0046] The implementation principle of this utility model is as follows: Using the electronic fuel injection valve body 4 as a structural carrier, it has an internal main air passage 6 for non-idle air intake and a fuel passage for fuel delivery. The intake end has an interface for installing an air filter to remove impurities, and the outlet end has a mounting bracket 2 to seal the connection with the engine crankcase. A throttle body spindle 10, located at the center and transversely penetrating the valve body, is rotatably connected inside the electronic fuel injection valve body 4. A sealed bearing is installed at the connection between the spindle and the valve body to reduce friction and prevent air leakage. A throttle spring 7 for cutting off or opening the airflow in the main air passage 6, a throttle position sensor 3 for real-time acquisition of spindle opening information and transmission to the electronic control unit (ECU), and a limiter for the main air passage 6 are all installed on the spindle. The throttle limiter 5 is designed to prevent engine overspeed by adjusting the maximum rotation angle of the shaft. An electromagnetic fuel injector 1, which is connected to the fuel passage and located above and behind the main air passage 6, is also installed on the electronic fuel injection valve body 4. The nozzle direction is at an acute angle (preferably 45°) to the airflow in the main air passage 6 to utilize the kinetic energy of the airflow to promote fuel atomization. The ECU controls the fuel injection quantity of the electromagnetic fuel injector 1 based on the signal from the throttle position sensor 3. At the same time, an idle flow passage 8, which is connected in parallel with the main air passage 6, is provided in the electronic fuel injection valve body 4. An idle speed limit adjustment screw 9 is provided on the flow passage to precisely adjust the idle air intake. Through the integration of the above structures and the coordination of electronic control, the precise matching of intake regulation and fuel injection is achieved to meet the complex operating conditions of the two-stroke engine of the fire pump.

[0047] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump, characterized in that, Including the electronic fuel injection valve body (4), The electronic fuel injection valve body (4) has a main air passage (6) and a fuel passage inside, and a throttle valve spindle (10) is rotatably connected inside the electronic fuel injection valve body (4); Throttle spring (7) is installed on the throttle spindle (10) for cutting off or opening the air flow of the main air passage (6); A throttle position sensor (3) is also installed on the throttle spindle (10); An electromagnetic fuel injector (1) is installed on the electronic fuel injection valve body (4). The electromagnetic fuel injector (1) is connected to the fuel passage and is located above and behind the main air passage (6). The throttle position sensor (3) and the electromagnetic fuel injector (1) are both connected to the electronic control unit (ECU) for signal control. The ECU is used to control the fuel injection quantity of the electromagnetic fuel injector (1) according to the electrical signal of the throttle position sensor (3).

2. The integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to claim 1, characterized in that, The electronic fuel injection valve body (4) has an idle flow channel (8) connected in parallel with the main air passage (6).

3. An integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to claim 2, characterized in that, The idle flow channel (8) is provided with an idle limit adjustment screw (9) for adjusting the air flow under idle conditions.

4. An integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to claim 1, characterized in that, The throttle valve spindle (10) is equipped with a throttle limit plate (5).

5. An integrated oil-air mixing electronic injection valve for a two-stroke engine of a fire pump according to claim 1, characterized in that, The air intake end of the electronic fuel injection valve body (4) is provided with an interface for installing an air filter, and the air outlet end is provided with a mounting bracket (2) for connecting to the air intake of the engine crankcase.

6. An integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to claim 1, characterized in that, One end of the fuel passage is connected to the fuel inlet, and the other end is connected to the fuel inlet of the electromagnetic injector (1).

7. An integrated oil-gas mixing electronic injection valve for a two-stroke engine of a fire pump according to claim 1, characterized in that, The nozzle direction of the electromagnetic fuel injector (1) forms an acute angle with the airflow direction of the main air passage (6).

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