CN204163896U - A kind of natural gas engine gas handling system - Google Patents

Abstract

The utility model relates to the technical field of engines, in particular to a natural gas engine intake system refitted from a diesel engine, comprising a cylinder head and an air filter, a supercharger, an intercooler, an electronic throttle and a mixer connected in sequence through pipelines Assembly, the cylinder head is provided with an intake manifold, one side of the cylinder head is provided with an inlet of the intake manifold, the mixer assembly is connected with the inlet of the intake manifold through a pipe, and the mixer assembly is provided with Natural gas inlet; also includes an anti-surge valve, the air inlet of the anti-surge valve communicates with the pipeline between the supercharger and the electronic throttle, and the air outlet of the anti-surge valve communicates with the air filter and the supercharger The pipeline is connected, and the reference port of the anti-surge valve is connected with the intake manifold. The utility model has the advantages of simple manufacturing process, low cost, easy maintenance and low failure rate.

Description

A natural gas engine intake system

technical field

The utility model relates to the technical field of engines, in particular to a natural gas engine intake system refitted from a diesel engine.

Background technique

In the existing technology, the fuel of the engine is mainly gasoline and diesel oil, but at present, with the depletion of oil resources, shortage, environmental pollution and global warming, a series of problems have become increasingly prominent, all countries in the world have put energy saving, The reduction of pollutants is the first priority. Compared with ordinary diesel engines, natural gas engines have the outstanding advantages of energy saving, environmental protection, and high economy. Parts are worn out, which can effectively prolong the life of the engine and reduce maintenance costs. Therefore, the domestic demand for natural gas heavy trucks is increasing year by year. The demand for high-performance and high-power natural gas engines, which are the heart of the vehicle, is also increasing.

At present, most natural gas engines are developed on the basis of diesel engines. Generally, in order to improve the uniformity of gas and air mixing (that is: the consistency of the air-fuel ratio of the mixed gas entering each cylinder), a single-point injection natural gas engine is usually used. The inlet of the mixed gas is set in the middle of the intake manifold. However, since the intake manifold of the original diesel engine is integrated into the cylinder head, the inlet of the intake manifold is opened on the side of the cylinder head. The blank is not only complicated in process and high in cost, but also difficult in maintenance. In addition, the existing natural gas engine air intake system sets the electronic throttle valve downstream of the mixer assembly, resulting in the accumulation of oil sludge formed by the mixture of engine oil in the natural gas and dust in the air in the electronic throttle valve, resulting in the electronic throttle valve being stuck , affecting engine performance.

Contents of the invention

The purpose of the utility model is to overcome the disadvantages of the above-mentioned prior art and provide a natural gas engine intake system with simple manufacturing process, low cost, easy maintenance and low failure rate.

The technical problem to be solved by the utility model is realized by the following technical solutions: a natural gas engine intake system, including a cylinder head and an air filter, a supercharger, an intercooler, an electronic throttle and a mixer assembly connected in sequence through pipelines; The cylinder head is provided with an intake manifold, one side of the cylinder head is provided with an inlet of the intake manifold, the mixer assembly is connected with the inlet of the intake manifold through a pipeline, and the mixer assembly is provided with a natural gas Inlet; also includes an anti-surge valve, the air inlet of the anti-surge valve communicates with the pipeline between the supercharger and the electronic throttle, and the air outlet of the anti-surge valve communicates with the pipeline between the air filter and the supercharger The reference port of the anti-surge valve is connected with the intake manifold.

The working principle of the utility model: the air passes through the air filter and supercharger in turn, is cooled in the intercooler, and then enters the mixed gas assembly through the electronic throttle valve, and fully mixes with the natural gas that enters the mixer assembly through the natural gas inlet. After that, it enters the combustion chamber through the intake manifold and is ignited by the spark plug to do work. During the high-speed rotation of the impeller of the supercharger, if the electronic throttle valve is suddenly closed (such as a sudden engine shutdown), the pressure difference between the anti-surge valve reference port and the anti-surge valve intake port will increase, making the internal valve When it is opened, the supercharged high-pressure air can flow back to the upstream of the supercharger through the anti-surge valve, thereby preventing the supercharger from surging.

Compared with the prior art, the beneficial effect of the utility model natural gas engine intake system is: the cylinder head of the original diesel engine is directly used without modifying its structure, the manufacturing process is simple, and the cost is low; On the side of the cylinder head, many pipelines and components of the intake system are exposed outside the cylinder head, which is easy to maintain; the electronic throttle valve is located upstream of the mixer assembly to avoid sticking caused by accumulated sludge in the electronic throttle valve. The performance of natural gas engine is improved; the anti-surge valve prevents the surge of the supercharger, making the performance of natural gas engine more stable.

Preferably, the upstream pipeline of the electronic throttle is provided with an intake air temperature and pressure sensor I, and the downstream pipeline of the electronic throttle is provided with an intake air temperature and pressure sensor II. With this technical solution, the air intake temperature and pressure sensor I and the intake air temperature pressure sensor II are used to collect the pressure and temperature data of the gas in the intake system, and then the air mass and flow rate are calculated by the ECU.

Preferably, the intake air temperature and pressure sensor I is set on the pipeline between the intercooler and the electronic throttle and is relatively close to the electronic throttle, and the intake air temperature and pressure sensor II is set on the total of the electronic throttle and the mixer. On the pipeline between components and far away from the electronic throttle. Adopting the technical solution can prevent the air flow generated by the action of the electronic throttle from affecting the accuracy of the data collected by the intake air temperature and pressure sensor II, and make the data collected by the intake air temperature and pressure sensor II more accurate.

Preferably, the air inlet of the anti-surge valve communicates with the pipeline between the intercooler and the electronic throttle. By adopting the technical scheme, the temperature of the air flowing through the anti-surge valve is cooled by the intercooler, so as to prevent the anti-surge valve from being damaged due to excessive air temperature.

Preferably, the pipeline between the intercooler and the electronic throttle is fixed on the cylinder head through a bracket. By adopting the technical scheme, the structure of the air intake system is more compact and firm.

Preferably, both the mixer assembly and the anti-surge valve are fixed on the cylinder head through a bracket. By adopting the technical scheme, the structure of the air intake system is more compact and firm.

Description of drawings

Fig. 1 is a structural schematic diagram of the gas engine intake system of the utility model.

Fig. 2 is a side view of the utility model cylinder head.

In the figure: 1. Cylinder head, 1-1. Intake manifold inlet, 2. Air filter, 3. Supercharger, 4. Intercooler, 5. Electronic throttle, 6. Mixer assembly, 6-1 , Natural gas inlet, 7, Anti-surge valve, 7-1, Anti-surge valve inlet, 7-2, Anti-surge valve outlet, 7-3, Anti-surge valve reference port, 8, Intake temperature Pressure sensor Ⅰ, 9, intake air temperature and pressure sensor Ⅱ.

Detailed ways

In order to clearly illustrate the technical features of this solution, the specific implementation of the utility model will be further described below according to the accompanying drawings.

As shown in Figure 1 and Figure 2, a natural gas engine intake system includes a cylinder head 1 and an air filter 2, a supercharger 3, an intercooler 4, an electronic throttle 5 and a mixer assembly connected in sequence through pipelines 6. The cylinder head 1 is provided with an intake manifold, and one side of the cylinder head 1 is provided with an intake manifold inlet 1-1, and the mixer assembly 6 is connected to the intake manifold inlet 1-1 through a pipeline, so The mixer assembly 6 is provided with a natural gas inlet 6-1; it also includes an anti-surge valve 7, the pipeline between the air inlet 7-1 of the anti-surge valve and the intercooler 4 and the electronic throttle valve 5 connected, the anti-surge valve outlet 7-2 communicates with the pipeline between the air filter 2 and the supercharger 3, and the anti-surge valve reference port 7-3 communicates with the intake manifold; the gas mixture assembly 6, The anti-surge valve 7 and the pipeline between the intercooler 4 and the electronic throttle 5 are all fixed on the cylinder head 1 through brackets; the pipeline between the intercooler 4 and the electronic throttle 5 is provided with an intake The temperature and pressure sensor I8, the intake air temperature and pressure sensor I9 is relatively close to the electronic throttle valve 5, the intake air temperature and pressure sensor II9 is installed on the pipeline between the electronic throttle valve 5 and the mixer assembly 6, and the intake air temperature and pressure sensor II9 is installed on the pipeline between the electronic throttle valve 5 and the mixer assembly The gas temperature and pressure sensor II9 is far away from the electronic throttle valve 5 .

The working principle of the utility model: the air passes through the air filter 2 and the supercharger 3 in turn, is cooled in the intercooler 4, and then enters the mixed gas assembly 6 through the electronic throttle valve 5, and enters through the natural gas inlet 6-1 After the natural gas in the mixer assembly 6 is fully mixed, it enters the combustion chamber through the intake manifold and is ignited by the spark plug to perform work. During the high-speed rotation of the impeller of the supercharger 3, if the electronic throttle valve 5 is suddenly closed (for example, the engine suddenly stops), the anti-surge valve reference port 7-3 and the pressure at the anti-surge valve inlet 7-1 will The difference will increase, so that the internal valve is opened, and the supercharged high-pressure air can flow back to the upstream of the supercharger 3 through the anti-surge valve 7, thereby preventing the supercharger 3 from surging.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Make various changes below.

Claims (6)

1. A natural gas engine intake system, including a cylinder head (1) and an air filter (2), a supercharger (3), an intercooler (4), an electronic throttle (5) and a hybrid The mixer assembly (6), the cylinder head (1) is provided with an intake manifold, one side of the cylinder head (1) is provided with an intake manifold inlet (1-1), and the mixer assembly (6) It is connected with the intake manifold inlet (1-1) through a pipeline, and the mixer assembly (6) is provided with a natural gas inlet (6-1); it also includes an anti-surge valve (7), and the anti-surge valve The air inlet (7-1) is connected to the pipeline between the supercharger (3) and the electronic throttle (5), and the anti-surge valve outlet (7-2) is connected to the air filter (2) and the supercharger The pipelines between (3) are connected, and the anti-surge valve reference port (7-3) is connected with the intake manifold. 2. The natural gas engine air intake system according to claim 1, characterized in that: the upstream pipeline of the electronic throttle (5) is provided with an intake air temperature and pressure sensor I (8), and the electronic throttle (5) The downstream pipeline is provided with an intake air temperature and pressure sensor II (9). 3. The natural gas engine intake system according to claim 2, characterized in that: the intake air temperature and pressure sensor I (8) is set on the pipeline between the intercooler (4) and the electronic throttle (5) , the intake air temperature and pressure sensor II (9) is set on the pipeline between the electronic throttle (5) and the mixer assembly (6). 4. The natural gas engine air intake system according to any one of claims 1-3, characterized in that: the air inlet (7-1) of the anti-surge valve (7) is connected with the intercooler (4) and electronic Pipeline communication between throttle valves (5). 5. The natural gas engine intake system according to any one of claims 1-3, characterized in that: the pipeline between the intercooler (4) and the electronic throttle (5) is fixed on the cylinder head ( 1) on. 6. The natural gas engine intake system according to any one of claims 1-3, characterized in that: the mixer assembly (6) and the anti-surge valve (7) are both fixed on the cylinder head (1) by brackets superior.