Dual-fuel carburetor of special fuel gas flow channel

Abstract

According to the dual-fuel carburetor with the special fuel gas flow channel, the partition plate is arranged on the throat portion to form the special fuel gas flow channel between the fuel gas nozzle and the fuel oil nozzle, so that the fuel gas nozzle and the fuel oil nozzle are separated from each other, and it is guaranteed that fuel oil or / and fuel gas smoothly enters the throat portion to be mixed with air; fuel oil steam sprayed by the fuel oil nozzle is prevented from splashing to the fuel gas nozzle, so that fuel oil flows into the fuel gas inlet channel, and the fuel gas flow is prevented from being influenced; the partition plate is bent towards the direction of the fuel gas nozzle to form the arc-shaped partition plate, so that the special fuel gas throat is formed, the mixing effect of fuel gas and air or / and fuel oil is enhanced, the combustion efficiency of an engine is improved, the fuel utilization rate is increased, the fuel cost is reduced, and the purposes of energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] This utility model relates to the field of carburetor structure technology, and in particular to a dual-fuel carburetor with a dedicated gas flow channel. Background Technology

[0002] A traditional carburetor is a mechanical device that mixes fuel and air in a specific ratio under the vacuum created by the engine. A dual-fuel carburetor is a new type of carburetor developed from the traditional carburetor. It adds a fuel supply structure to the traditional carburetor structure to mix fuel and air, meeting the needs of engines using natural gas, liquefied petroleum gas, or other fuels. It features strong fuel adaptability, improved engine performance, lower cost, and enhanced environmental performance.

[0003] In existing dual-fuel carburetors, the air-fuel mixture typically occurs at the throat. The throat is a constricted section on the carburetor body that accelerates the flow of air. This accelerated airflow reduces atmospheric pressure within the carburetor, creating a vacuum. This vacuum draws fuel vapor from the fuel injector into the throat, thus completing the air-fuel mixture, or it draws fuel gas from the combustion air injector into the throat, achieving air-fuel mixture. However, most existing dual-fuel carburetors have a single-throat structure. Fuel vapor from the fuel injector may splash onto the combustion air injector, making it difficult for combustion air to be drawn into the throat. This results in insufficient air intake, reducing engine efficiency and affecting normal engine operation.

[0004] Therefore, it is necessary to improve the existing carburetor air-fuel mixing structure. This will not only enable different fuels to mix smoothly with air and prevent fuel vapors sprayed from the fuel nozzle from splashing onto the gas nozzle and causing fuel to flow into the gas intake manifold, thus blocking the gas intake manifold and affecting the gas flow, but also improve the engine's combustion efficiency, reduce fuel costs, and achieve the goal of energy conservation and environmental protection. Utility Model Content

[0005] In view of the shortcomings of the current carburetor's fuel-air mixing structure, the purpose of this utility model is to provide a dual-fuel carburetor with a dedicated gas flow channel. This not only allows different fuels to mix smoothly with air, preventing fuel vapor sprayed from the fuel nozzle from splashing onto the gas nozzle and causing fuel to flow into the gas intake passage, thus blocking the gas intake passage and affecting the gas flow, but also improves the engine's combustion efficiency, reduces fuel costs, and achieves the goal of energy conservation and environmental protection.

[0006] To achieve the purpose of this utility model, this utility model provides a dual-fuel carburetor with a dedicated gas flow channel, including a carburetor body. The carburetor body is provided with an air intake channel, and the air intake channel is provided with a throat. A gas nozzle and a fuel nozzle are provided at the throat. A dedicated gas flow channel is also provided at the throat, which is formed by a partition between the gas nozzle and the fuel nozzle.

[0007] Furthermore, the baffle is fixed to the throat and bent toward the gas nozzle to form an arc-shaped baffle, thereby forming a dedicated gas throat.

[0008] Furthermore, a dedicated gas throat is formed within the dedicated gas flow channel.

[0009] Furthermore, the end of the arc-shaped baffle located on the air intake side of the gas-dedicated flow channel is an inclined end, which is radially inward and inclined in the direction of airflow.

[0010] Furthermore, both the gas nozzle and the fuel nozzle are located axially close to the intake side of the dedicated gas flow channel.

[0011] Furthermore, the gas nozzle portion is exposed at the inclined end of the arc-shaped baffle.

[0012] Furthermore, the fuel nozzle is located near the edge of the inclined end of the arc-shaped baffle.

[0013] Furthermore, the gas nozzle is located in front of the dedicated gas throat.

[0014] Furthermore, a specific height difference is provided between the center position of the dedicated gas flow channel and the center position of the throat.

[0015] Furthermore, the arc-shaped partition includes an arc-shaped segment and straight segments extending from both ends of the arc-shaped segment, the straight segments being fixed at the corresponding position of the throat.

[0016] The beneficial effects of this utility model are as follows: The dual-fuel carburetor with a dedicated gas flow channel of this utility model has a baffle plate at the throat, which separates the gas nozzle and the fuel nozzle to form a dedicated gas flow channel. This separates the gas nozzle and the fuel nozzle from each other, ensuring that fuel and / or gas can smoothly enter the throat and mix with air. It also prevents fuel vapor sprayed from the fuel nozzle from splashing onto the gas nozzle, causing fuel to flow into the gas intake passage and thus affecting the gas flow rate. The baffle plate is bent towards the gas nozzle to form an arc-shaped baffle, thereby forming a dedicated gas throat, which enhances the mixing effect of gas and air and / or fuel, improves the combustion efficiency of the engine, increases fuel utilization, reduces fuel costs, and achieves the goal of energy conservation and environmental protection. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 This is a rear view of the present invention;

[0020] Figure 4 for Figure 2 Longitudinal cross section along the middle AA;

[0021] Figure 5 for Figure 3 Longitudinal cross-section of the middle section BB;

[0022] Figure 6 for Figure 5 Enlarged view of point C in the middle.

[0023] Reference numerals in the attached drawings: 1. Carburetor body; 2. Intake passage; 3. Throat; 4. Gas nozzle; 5. Fuel nozzle; 6. Gas-specific flow channel; 7. Arc-shaped baffle; 701. Inclined end of the arc-shaped baffle located on the intake side of the gas-specific flow channel; 702. Arc-shaped segment of the arc-shaped baffle; 703. Straight segment formed by the extension of both ends of the arc-shaped segment; 8. Gas-specific throat. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail below.

[0025] This utility model discloses a dual-fuel carburetor with a dedicated gas flow channel, including a carburetor body 1. The carburetor body 1 has an intake channel 2, and the intake channel 2 has a throat 3. A gas nozzle 4 and a fuel nozzle 5 are located at the throat 3. A dedicated gas flow channel 6 is also located at the throat 3, formed by a baffle between the gas nozzle 4 and the fuel nozzle 5. The carburetor body 1 serves as the basic frame of the entire carburetor and is usually cast from metal or machined with high precision to ensure the structural strength and dimensional accuracy of the internal channels. The shape and size design of the carburetor body 1 must be closely adapted to the engine's intake system to ensure stable installation and sealing of the interfaces. The design of the intake channel 2 directly affects the amount and velocity of air entering the carburetor. Usually, its inner wall is polished to reduce airflow resistance. The intake channel 2 can also adopt a special streamlined design, gradually... The air gradually narrows towards the throat 3. This design fully utilizes the Venturi effect; when air passes through the throat 3 at high speed, the pressure drops significantly, creating a sufficient vacuum to facilitate the subsequent intake of fuel and gas. Further details are omitted here. The gas nozzle 4 and fuel nozzle 5 are separately installed, and a dedicated gas flow channel 6 is provided at the throat 3. This allows for more precise control and distribution of gas and fuel before they enter the engine, resulting in better fuel-air mixing and more complete combustion, thereby improving combustion efficiency and reducing energy consumption and pollutant emissions. Through the rational design of the gas nozzle 4, fuel nozzle 5, and dedicated gas flow channel 6, fuel can enter the engine combustion chamber at the throat 3 in a more ideal state, improving the engine's intake and combustion processes and enhancing engine power output. The airflow direction within the dedicated gas flow channel 6 is consistent with the airflow direction of the intake channel 2. Further details are omitted here.

[0026] In this embodiment, the baffle is fixed to the throat 3 and bent towards the gas nozzle 4 to form an arc-shaped baffle 7, thereby forming a dedicated gas throat 8. The baffle is bent towards the gas nozzle 4, so that the dedicated gas throat 8 forms a specific shape, guiding the gas to flow more smoothly, reducing airflow turbulence and resistance, and allowing the gas to enter the subsequent mixing chamber more efficiently through the throat 3, and mix better with the air. The special design of the dedicated gas throat 8 ensures that the flow direction of the gas at the dedicated gas throat 8 is consistent with the airflow direction of the intake channel 2, which will not be elaborated here. This allows the gas to mix more evenly with the gas entering from other channels. The uniform mixture helps to achieve more stable and complete combustion, improves combustion efficiency, reduces local overheating or incomplete combustion during the combustion process, reduces pollutant emissions, and also reduces engine vibration and noise, extending the engine's service life.

[0027] In this embodiment, a dedicated gas throat 8 is formed within the dedicated gas flow channel 6. The dedicated gas throat 8 provides a dedicated flow channel for the gas, which can accurately guide the gas flow direction, allowing it to enter the subsequent combustion zone more smoothly. Compared with a dual-fuel carburetor without a dedicated throat, the gas flow is more concentrated, reducing the scattering and turbulence of the gas in the flow channel, and improving the efficiency and controllability of the gas flow. According to the principles of fluid mechanics, the cross-sectional area of ​​the throat 3 is reduced, which increases the gas flow velocity. An appropriate increase in flow velocity helps the gas mix better with the air, and can produce a certain injection effect when entering the subsequent combustion chamber, enhancing the disturbance between the gas and the surrounding air, further promoting the uniformity of mixing, optimizing the combustion process, and improving the engine's power performance.

[0028] In this embodiment, the end of the arc-shaped baffle 7 located on the air intake side of the dedicated gas flow channel 6 is an inclined end 701. The inclined end 701 is radially inward and inclined in the direction of airflow. This inclined end 701 can guide the gas to smoothly enter the dedicated gas flow channel 6 along the inclined direction, reducing turbulence and resistance of the gas on the air intake side of the dedicated gas flow channel 6, allowing the gas to flow into the dedicated gas throat 8 more efficiently, and improving the gas intake efficiency. The inclined design allows the gas to form a more uniform distribution on the cross-section when entering the dedicated gas flow channel 6. The gas will not concentrate on one side of the dedicated gas flow channel 6, but will fill the entire dedicated gas flow channel 6 more evenly along the guidance of the inclined end 701, which is conducive to the subsequent flow at the dedicated gas throat 8. Uniform air mixing lays the foundation; because the gas is more evenly distributed when it enters the dedicated gas flow channel 6, it can make more full contact and mix with the air when it passes through the dedicated gas throat 8. The inclined end 701 guides the gas to enter the dedicated gas throat 8 at a specific angle and speed, interacting with the air flow and promoting turbulent mixing of gas and air, making the composition of the mixture more uniform, which is beneficial to improving combustion efficiency and combustion stability. It also helps to reduce flow separation and vortex generation of gas on the air intake side of the dedicated gas flow channel 6, reducing energy loss during the flow process. Compared with the right angle or other shapes of the end of the dedicated gas flow channel 6, the inclined end 701 makes the gas flow smoother, reducing pressure loss and energy dissipation caused by poor flow, and improving the energy utilization efficiency of the entire system.

[0029] In this embodiment, both the gas nozzle 4 and the fuel nozzle 5 are axially close to the air intake side of the dedicated gas flow channel 6. This axial proximity allows the gas to quickly enter the dedicated gas flow channel 6 after injection, and the fuel to flow along a predetermined path in the area below the arc-shaped baffle 7, achieving initial mixing with the flowing air within a short distance. Due to the close proximity, the gas, fuel, and air have more opportunities to interact, resulting in more thorough mixing and a more uniform combustible mixture, laying the foundation for subsequent efficient combustion. On the air intake side of the dedicated gas flow channel 6, the airflow velocity is relatively high, and some turbulence exists. The gas nozzle 4 and fuel nozzle 5 are positioned here, allowing the injected gas and fuel to better mix with the air in this turbulent environment. This breaks the laminar boundary between gas and liquid, increasing the contact area between the gas, fuel, and air, resulting in more uniform and rapid mixing. The gas nozzle 4 and fuel nozzle 5 are located near the intake side of the dedicated gas flow channel 6, enabling more precise control of the gas and fuel before they enter the combustion zone. This allows for more accurate adjustment of the injection quantity and timing of the gas and fuel according to the engine's operating conditions and needs, ensuring a suitable air-fuel mixture is provided under different loads and speeds. This results in more efficient combustion, improving engine power output and fuel economy.

[0030] In this embodiment, the gas nozzle 4 is partially exposed at the inclined end 701 of the arc-shaped baffle 7. The inclined end 701 serves as a guide structure for gas injection, allowing the gas ejected from the gas nozzle 4 to enter the dedicated gas flow channel 6 more precisely along the direction of the inclined end 701. This helps control the injection angle and direction of the gas, reduces gas scattering, and improves the efficiency and accuracy of gas entering the dedicated gas flow channel 6. The partially exposed gas nozzle 4, located at the inclined end 701, allows the gas to immediately undergo preliminary mixing with the air near the inclined end 701 after ejection. It also allows a portion of the gas to enter the area below the arc-shaped baffle 7 and flow into the subsequent mixing chamber to fully mix with the mixed gas flowing out of the dedicated gas flow channel 6, improving combustion efficiency, making combustion more complete, reducing the generation of incomplete combustion products, reducing energy waste, and lowering environmental pollution. At the same time, the inclined end 701 can protect the gas nozzle 4 to a certain extent, shielding it from direct attack by external impurities, dust, and other pollutants, reducing the possibility of the gas nozzle 4 being blocked, and extending the service life of the gas nozzle 4.

[0031] In this embodiment, the fuel nozzle 5 is located near the edge of the inclined end 701 of the arc-shaped baffle 7. The airflow at the edge of the inclined end 701 forms a specific flow field. With the fuel nozzle 5 positioned near this location, the injected fuel can be guided by the airflow to enter the corresponding flow channel more smoothly, making the fuel injection direction more accurate, reducing fuel injection deviation and scattering, and improving the efficiency of fuel entering the flow channel. Positioning the fuel nozzle 5 near the edge of the inclined end 701 prevents fuel from directly spraying onto the arc-shaped baffle 7 and causing adhesion or accumulation, as the airflow at the edge of the inclined end 701 can promptly carry it away. The injected fuel reduces the contact between the fuel and the surface of the arc-shaped baffle 7, lowering the possibility of fuel forming an oil film or dripping on the arc-shaped baffle 7, thus ensuring the stability and uniformity of fuel injection. The airflow near the edge of the inclined end 701 is relatively complex, with certain turbulence and velocity gradients, which causes some fuel to enter the dedicated gas flow channel 6 and flow into the subsequent mixing chamber to fully mix with the oil-gas mixture flowing out from the area below the arc-shaped baffle 7, improving combustion efficiency, making combustion more complete, reducing the generation of incomplete combustion products, reducing energy waste and environmental pollution, which will not be elaborated further here.

[0032] In this embodiment, the gas nozzle 4 is located in front of the dedicated gas throat 8. This frontal position allows the gas nozzle 4 to inject gas into the dedicated gas throat 8 at a more suitable angle, controlling the gas flow direction and speed, reducing gas flow turbulence and energy loss, and improving gas flow efficiency within the dedicated gas throat 8. The narrowing of the dedicated gas throat 8 increases the airflow velocity, and the gas is subjected to this acceleration trend before entering the dedicated gas throat 8, which helps improve the mixing speed and effect of gas and air. Injecting gas in front of the dedicated gas throat 8 can... The gas can be pre-mixed with the surrounding air before entering the dedicated gas inlet 8. The space in front of the dedicated gas inlet 8 is relatively open and the air flow is relatively stable. The gas can be pre-mixed with the air in this area to form a preliminary mixture, which lays a good foundation for further mixing and combustion in the dedicated gas inlet 8 and subsequent mixing chambers. The high-speed airflow in the dedicated gas inlet 8 carries some impurities or particles. These impurities or particles can cause wear or blockage to the gas nozzle 4 under high-speed flow. The gas nozzle 4 is located in front of the dedicated gas inlet 8, so it is less likely to be impacted and blocked by impurities and particles, thus extending the service life of the gas nozzle 4.

[0033] In this embodiment, a specific height difference is provided between the center of the dedicated gas flow channel 6 and the center of the throat 3. This height difference allows the gas flowing out of the dedicated gas flow channel 6 to enter the throat 3 at a certain angle and direction, promoting the interaction between the gas and the air in the throat 3 and forming stronger turbulence. This improves the mixing effect, making the mixture more uniform. It also utilizes gravity and airflow to prevent the gas from flowing back to the gas nozzle 4 under certain operating conditions. Since the gas must overcome a certain height difference to flow back, this design increases the resistance to backflow, ensuring the directionality of the gas flow and facilitating the normal operation of the carburetor. The set height difference can effectively ensure the mixing effect of gas and air under different engine operating conditions, such as idling, low speed, or high speed. This allows the carburetor to stably provide a suitable mixture under different engine operating conditions, meeting the needs of different engine loads and improving the overall performance and adaptability of the engine.

[0034] In this embodiment, the arc-shaped baffle 7 includes an arc-shaped segment 702 and straight segments 703 extending from both ends of the arc-shaped segment 702. The straight segments 703 are fixed at the corresponding positions of the throat 3. The arc-shaped segment 702 can smoothly guide the flow of gas and air, allowing the airflow to flow along the designed path, reducing airflow turbulence and eddy currents. The straight segments 703 can tightly connect the arc-shaped segment 702 to the throat 3, ensuring that the airflow remains stable when transitioning from the arc-shaped segment 702 to the throat 3, avoiding abrupt changes or leaks at the connection point, thereby improving the accuracy and efficiency of airflow guidance. It also helps to better facilitate the flow of gas and air through the synergistic effect of the arc-shaped segment 702 and the straight segments 703 when the gas and air flow through the arc-shaped baffle 7. The arc-shaped segment 702 allows the airflow to rotate and turbulent, increasing the contact area and mixing intensity between the gas and air. The straight segment 703 stabilizes the airflow and further promotes mixing, making the mixture more uniform before entering the throat 3, which is beneficial to improving combustion efficiency. The straight segment 703 is fixed at the corresponding position of the throat 3, which can evenly transmit the airflow pressure and impact force borne by the arc-shaped baffle 7 to the throat 3. When the arc-shaped segment 702 is subjected to airflow, the stress generated by it is dispersed to a larger area of ​​the throat 3 through the straight segment 703, avoiding stress concentration, enhancing the stability and reliability of the entire structure, and reducing the risk of structural deformation or damage due to long-term stress.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A dual fuel carburettor for gas specific flow channels characterised in that: The carburetor body includes an air intake passage with a throat. A gas nozzle and a fuel nozzle are located at the throat. A dedicated gas flow channel is formed between the gas nozzle and the fuel nozzle by a baffle plate located at the throat.

2. The dual-fuel carburettor of claim 1, wherein: The baffle is fixed to the throat and bent toward the gas nozzle to form an arc-shaped baffle, thereby forming a dedicated gas throat.

3. The dual-fuel carburettor of claim 1 or 2, wherein: A dedicated gas throat is formed within the dedicated gas flow channel.

4. The dual-fuel carburettor of claim 2, wherein: The end of the arc-shaped baffle located on the air intake side of the gas-dedicated flow channel is an inclined end, which is radially inward and inclined in the direction of airflow.

5. The dual-fuel carburettor of claim 1 or 4, wherein: Both the gas nozzle and the fuel nozzle are located axially close to the intake side of the dedicated gas flow channel.

6. The dual-fuel carburettor of claim 4, wherein: The gas nozzle portion is exposed at the inclined end of the arc-shaped partition.

7. The dual-fuel carburettor of claim 4, wherein: The fuel nozzle is located near the edge of the inclined end of the arc-shaped baffle.

8. The dual-fuel carburettor of claim 6, wherein: The gas nozzle is located in front of the dedicated gas throat.

9. The dual-fuel carburettor of claim 1, wherein: There is a height difference between the center of the dedicated gas flow channel and the center of the throat.

10. The dual-fuel carburettor of claim 2, wherein: The arc-shaped partition includes an arc-shaped segment and straight segments extending from both ends of the arc-shaped segment, the straight segments being fixed at the corresponding position of the throat.

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