External Venturi mixer for gas engine

Abstract

The utility model relates to the field of gas engines, in particular to an external Venturi mixer for a gas engine. The external venturi mixer for the gas engine comprises a gas inlet pipeline and a mixer main body, a detection chamber is arranged between the gas inlet pipeline and the mixer main body, the diameter of the detection chamber is larger than that of the gas inlet pipeline and that of an internal channel of the mixer main body, and an oxygen concentration detection sensor is arranged in the detection chamber. By additionally arranging the detection chamber and the oxygen concentration detection sensor, the oxygen content of air entering the Venturi mixer can be directly measured, then the control precision of the air-fuel ratio is improved, and efficient and clean combustion of the gas engine is achieved.

Description

Technical Field

[0001] The present application relates to the field of gas engines, and in particular to an external venturi mixer for a gas engine. Background Art

[0002] The external Venturi mixer for gas engines is a gas mixing device based on the Venturi effect. It is mainly used to evenly mix low-pressure air with gas, thereby achieving premixed combustion of the gas engine to improve combustion efficiency and reduce emissions.

[0003] In the Venturi mixer, the air velocity increases and the air pressure decreases. The fuel gas enters the Venturi mixer under the action of the pressure difference and mixes with the air to form the mixture required for engine combustion. The mixture then passes through the throttle valve, and the ECU adjusts the opening of the throttle valve to control the intake volume of the mixture and drive the engine to operate.

[0004] For gas engines, in order to achieve efficient and clean combustion, the air-fuel ratio needs to be adjusted according to the engine's operating state. At different speeds, the engine's load and combustion conditions will change, so the air-fuel ratio needs to be adjusted to adapt to these changes.

[0005] Normally, the air-fuel ratio is adjusted by controlling the gas intake and air intake through the ECU. However, in different environments, the oxygen content in the air may have a slight deviation, so it is necessary to measure the oxygen content in the air.

[0006] However, the detection of engine intake oxygen content is usually not carried out directly, but is indirectly inferred by monitoring the engine's combustion efficiency and exhaust oxygen content. Therefore, when the engine's operating conditions change, it may interfere with the calculation of the intake oxygen content, resulting in inaccurate control of the air-fuel ratio. Utility Model Content

[0007] In order to further improve the control accuracy of the air-fuel ratio, the present application provides an external venturi mixer for a gas engine.

[0008] The external venturi mixer for gas engine provided in this application adopts the following technical solution:

[0009] An external venturi mixer for a gas engine comprises an air intake pipe and a mixer body, a detection chamber is arranged between the air intake pipe and the mixer body, the diameter of the detection chamber is larger than the diameter of the air intake pipe and the diameter of the internal channel of the mixer body, and an oxygen concentration detection sensor is arranged in the detection chamber.

[0010] By adopting the above technical solution and adding a detection chamber and an oxygen concentration detection sensor, the oxygen content of the air entering the Venturi mixer can be directly measured, thereby improving the control accuracy of the air-fuel ratio and achieving efficient and clean combustion of the gas engine.

[0011] Preferably, a mounting hole for arranging an oxygen concentration detection sensor is provided on the side wall of the detection chamber, and a signal line of the oxygen concentration detection sensor passes through the mounting hole.

[0012] By adopting the above technical solution, the sensor can be easily installed and its signal line can be guaranteed to pass smoothly, thereby improving the reliability and maintainability of the overall equipment.

[0013] Preferably, the inner wall of the detection chamber is configured as a curved surface, and the inner space of the detection chamber is spherical.

[0014] The adoption of the above technical solution helps to reduce gas flow resistance and promote uniform mixing of gases, thereby enhancing the mixing effect and promoting more complete combustion.

[0015] Preferably, a flow guide bracket is further provided in the detection chamber, and the flow guide bracket includes a fixing frame fixedly connected to the inner wall of the detection chamber and a flow guide vane arranged on the fixing frame.

[0016] By adopting the above technical solution, the gas flow can be better guided, and the gas mixing effect can be enhanced by setting the guide vanes.

[0017] Preferably, the flow guide bracket further comprises a mounting ring connected to the fixing bracket, wherein the mounting ring is located at the center of the detection chamber; and the oxygen concentration detection sensor is arranged on the mounting ring.

[0018] By adopting the above technical solution, the accuracy of the sensor position and the measurement precision are ensured.

[0019] Preferably, the oxygen concentration detection sensor is threadedly connected to the mounting ring.

[0020] By adopting the above technical solution, not only the installation of the sensor is facilitated, but also the rapid disassembly and maintenance thereof when necessary is facilitated.

[0021] Preferably, the guide vanes are arranged on the circumferential side of the mounting ring.

[0022] By adopting the above technical solution, the gas flow path in the detection chamber is further optimized and the gas mixing efficiency is further improved.

[0023] Preferably, both ends of the detection chamber are provided with threaded ends, and the detection chamber is connected to the air intake pipe and the mixer body through the threaded ends.

[0024] By adopting the above technical solution, this connection method not only ensures the sealing performance, but also facilitates the overall installation and disassembly operations of the mixer.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Since the application adds a detection chamber and an oxygen concentration detection sensor, the oxygen content of the air entering the venturi mixer is directly measured, thereby improving the control accuracy of the air-fuel ratio, so that the gas engine can maintain an efficient and clean combustion state under various working conditions;

[0027] 2. This application further improves the flow state of the gas by optimizing the structural design of the detection chamber and adding guide brackets, which is more conducive to the oxygen concentration detection sensor to measure the oxygen in the air and improves the working performance of the mixer. At the same time, this application also has the advantages of compact structure and easy installation, which is convenient for promotion and use in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of an external Venturi mixer for a gas engine in an embodiment of the present application;

[0029] Figure 2 It is an exploded structural diagram of an external venturi mixer for a gas engine in an embodiment of the present application.

[0030] Figure 3 It is a cross-sectional view of the detection chamber in the embodiment of the present application, which is used to show the structure of the flow guide bracket.

[0031] Markings in the attached drawings: 1. air intake pipe; 2. mixer body; 3. detection chamber; 4. guide bracket; 41. fixing bracket; 42. mounting ring; 43. guide blade; 5. oxygen concentration detection sensor. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] This embodiment discloses an external venturi mixer for a gas engine. The venturi mixer is a gas mixing device based on the venturi effect, which can evenly mix low-pressure air and gas to achieve premixed combustion of the gas engine, thereby improving combustion efficiency and reducing emissions.

[0034] Reference Figure 1 and Figure 2Specifically, the mixer includes an air intake pipe 1, a mixer body 2, and a detection chamber 3 located therebetween. Both ends of the detection chamber 3 are provided with threaded ends, and the detection chamber 3 is connected to the air intake pipe 1 and the mixer body 2 through the threaded ends. The detection chamber 3, the air intake pipe 1, and the internal channel of the mixer body 2 are coaxially arranged. The continuity and smoothness of the gas flow are ensured, thereby facilitating the uniform mixing of the gas and the air.

[0035] Reference Figure 2 and Figure 3 Furthermore, the diameter of the detection chamber 3 is larger than the diameter of the air intake pipe 1 and the diameter of the internal channel of the mixer body 2, which can facilitate the installation of the oxygen concentration detection sensor 5 inside the detection chamber 3 and reduce the flow rate of the airflow after entering the detection chamber 3, so that the sensor can detect the oxygen concentration.

[0036] The oxygen concentration detection sensor 5 can directly measure the oxygen content of the air in the intake pipe 1, providing the ECU with more accurate data to adjust the air-fuel ratio.

[0037] The inner wall of the detection chamber 3 is designed to be a curved surface, and the inner space thereof is spherical. This structure not only reduces the resistance to gas flow, but also enables the gas to be more evenly distributed in the detection chamber 3, providing conditions for subsequent uniform mixing with the fuel gas.

[0038] In order to further improve the flow and mixing effect of the gas, a guide bracket 4 is also provided in the detection chamber 3. The guide bracket 4 is composed of a fixing bracket 41, a mounting ring 42 and a guide vane 43. The fixing bracket 41 is firmly connected to the inner wall of the detection chamber 3, and the mounting ring 42 is located at the center of the detection chamber 3 and is fixedly connected to the fixing bracket 41. The guide vane 43 is arranged on the fixing bracket 41 and is arranged around the circumference of the mounting ring 42, and its function is to guide the flow direction of the gas.

[0039] In order to enable the oxygen concentration detection sensor 5 to accurately measure the oxygen content in the air, the oxygen concentration detection sensor 5 is arranged on the mounting ring 42 and is threadedly connected to the mounting ring 42, so that the oxygen concentration detection sensor 5 is located at the center of the detection chamber 3. A mounting hole for mounting the oxygen concentration detection sensor 5 is arranged on the side wall of the detection chamber 3, and the signal line of the oxygen concentration detection sensor 5 can pass through the mounting hole. Such a design facilitates the installation of the sensor and ensures that its signal line passes smoothly, thereby improving the reliability and maintainability of the overall equipment.

[0040] The concentration detection sensor can accurately measure the oxygen content in the air and transmit this data to the ECU. In this way, the ECU can accurately adjust the intake volume of fuel gas and air based on the real-time oxygen concentration data to maintain the optimal air-fuel ratio.

[0041] The working principle of this embodiment is as follows: when the gas engine is working, air will flow into the detection chamber 3 through the intake pipe 1. During this process, the oxygen concentration detection sensor 5 will accurately measure the oxygen concentration of the air. Subsequently, the gas enters from another passage and mixes with the air in the detection chamber 3. Under the action of the Venturi effect, the mixed gas will be accelerated when passing through the mixer body 2, thereby achieving a more uniform mixing. The ECU uses the oxygen concentration data obtained by the sensor to accurately control the intake ratio of gas and air to achieve the best air-fuel mixing effect.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An external Venturi mixer for a gas engine, characterized in that: The invention comprises an air intake pipe (1) and a mixer body (2), wherein a detection chamber (3) is arranged between the air intake pipe (1) and the mixer body (2), the diameter of the detection chamber (3) being larger than the diameter of the air intake pipe (1) and the diameter of the internal passage of the mixer body (2), and an oxygen concentration detection sensor (5) is arranged in the detection chamber (3).

2. The external Venturi mixer for a gas engine according to claim 1, characterized in that: A mounting hole for arranging an oxygen concentration detection sensor (5) is provided on the side wall of the detection chamber (3), and a signal line of the oxygen concentration detection sensor (5) passes through the mounting hole.

3. The external Venturi mixer for a gas engine according to claim 1, characterized in that: The inner wall of the detection chamber (3) is arranged to be a curved surface, and the internal space of the detection chamber (3) is spherical.

4. The external Venturi mixer for a gas engine according to claim 1, characterized in that: A flow guide bracket (4) is also provided in the detection chamber (3), and the flow guide bracket (4) comprises a fixing bracket (41) fixedly connected to the inner wall of the detection chamber (3) and a flow guide blade (43) provided on the fixing bracket (41).

5. The external Venturi mixer for a gas engine according to claim 4, characterized in that: The flow guide bracket (4) further comprises a mounting ring (42) connected to the fixing bracket (41), wherein the mounting ring (42) is located at the center of the detection chamber (3); and the oxygen concentration detection sensor (5) is arranged on the mounting ring (42).

6. The external Venturi mixer for a gas engine according to claim 5, characterized in that: The oxygen concentration detection sensor (5) is threadedly connected to the mounting ring (42).

7. The external Venturi mixer for a gas engine according to claim 6, characterized in that: The guide vanes (43) are arranged on the circumferential side of the mounting ring (42).

8. The external Venturi mixer for a gas engine according to claim 1, characterized in that: Both ends of the detection chamber (3) are provided with threaded ends, and the detection chamber (3) is connected to the air intake pipe (1) and the mixer body (2) via the threaded ends.

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