Gas internal combustion engine large-flow light-weight gas rail based on multi-point injection

Abstract

The invention discloses a gas internal combustion engine large-flow light-weight gas rail based on multi-point injection, and relates to the field of marine gas internal combustion engine design. The problems that fuel supply of an existing gas internal combustion engine has the characteristic of being large in gas flow, and the gas flow is controlled by controlling the injection pulse width of an electromagnetic valve, so that control is inaccurate, and pressure fluctuation is large are solved. Two gas rail gas inlets communicating with a gas rail gas cavity are formed in the two ends of a light-weight gas rail body correspondingly, a plurality of gas rail gas outlets are formed in the bottom of the light-weight gas rail body and communicate with the gas rail gas cavity, and each gas rail gas outlet is provided with a connecting block; the connecting block is provided with connecting block fuel gas outlets communicating with the gas rail fuel gas outlets, and each connecting block fuel gas outlet is provided with a fuel gas injection guide pipe. The method is used for controlling the pressure of the gas entering the engine in real time, so that the gas injection valve works in a linear area, and the gas supply amount is guaranteed through cooperative control of the pressure and the injection pulse width.

Description

Technical Field

[0001] The invention relates to the field of design of marine gas internal combustion engines, and in particular to a large-flow lightweight gas rail of a gas internal combustion engine based on multi-point injection. Background Art

[0002] Gas internal combustion engines play a vital role in energy conservation and emission reduction in the transportation field, including vehicles, ships, generator sets and other equipment. Natural gas has the advantages of being green and clean, and gas internal combustion engines have become the choice for propulsion and power generation of inland and ocean-going ships.

[0003] The fuel supply system is the heart of the engine, and the quality of fuel supply directly affects the engine output performance. The fuel supply of a gas internal combustion engine is characterized by a large gas flow rate, and relying on controlling the injection pulse width of the solenoid valve to control the gas flow rate has the disadvantages of inaccurate control and large pressure fluctuations.

[0004] In today's world of environmental degradation and energy shortage, the development of clean energy represented by natural gas has become the main goal of all countries. Therefore, there is an urgent need for a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection to overcome the above-mentioned shortcomings. The present invention has a beneficial effect on the technical development and application promotion of gas internal combustion engines. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the fuel supply of the existing gas internal combustion engine has the characteristics of large gas flow, and the gas flow is controlled by controlling the injection pulse width of the solenoid valve, which has the problems of inaccurate control and large pressure fluctuations, and further provide a large-flow lightweight gas rail for the gas internal combustion engine based on multi-point injection.

[0006] The technical solution of the present invention is:

[0007] A large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection, comprising a lightweight gas rail body 1, a plurality of connecting blocks 2 and a plurality of gas injection guide pipes 6, wherein a gas rail air cavity is arranged inside the lightweight gas rail body 1, a first gas rail air inlet 3a and a second gas rail air inlet 3b connected to the gas rail air cavity are respectively provided at both ends of the lightweight gas rail body 1, a plurality of gas rail gas outlets evenly arranged from left to right along the length direction are sequentially provided at the bottom of the lightweight gas rail body 1, the gas rail gas outlets are connected to the gas rail air cavity, a connecting block 2 is respectively installed on each gas rail gas outlet, a connecting block gas outlet 5 connected to the gas rail gas outlet is provided on the connecting block 2, and a gas injection guide pipe 6 is installed on each connecting block gas outlet 5.

[0008] Furthermore, the gas injection guide pipe 6 includes a main pipe section 6a, a first branch pipe section 6b and a second branch pipe section 6c. The head end of the main pipe section 6a is connected to the connecting block gas outlet 5, and the tail end of the main pipe section 6a is simultaneously connected to the head ends of the first branch pipe section 6b and the second branch pipe section 6c.

[0009] Furthermore, the ends of the first branch pipe section 6b and the second branch pipe section 6c face the valve in the cylinder head of the engine.

[0010] Furthermore, the bifurcation angle between the first branch pipe section 6b and the second branch pipe section 6c and the lengths of the first branch pipe section 6b and the second branch pipe section 6c match the position of the valve in the cylinder head of the engine.

[0011] Furthermore, it also includes a plurality of solenoid valves 4. A plurality of valve holes are provided at the upper end of the lightweight air rail body 1, and a solenoid valve 4 is installed on each valve hole.

[0012] Furthermore, the plurality of valve holes correspond one-to-one to the plurality of gas rail gas outlets respectively.

[0013] Furthermore, a plurality of weight-reducing holes are provided on the lightweight air rail body 1 .

[0014] Furthermore, the weight-reducing holes penetrate the upper and lower surfaces of the lightweight air rail body 1 .

[0015] Furthermore, the weight-reducing hole and the air track air cavity are arranged in a staggered manner.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1. The invention discloses a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection, which adopts a lightweight design and reduces the weight of the gas rail by hollowing out, thereby improving the power density of the engine. At the same time, the holes dug are also conducive to heat dissipation of the gas rail.

[0018] 2. The high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection described in the present invention adopts two-way air intake to ensure the gas flow demand of a high-power LNG gas internal combustion engine. In addition, the two-way air intake is conducive to reducing the pressure fluctuation in the gas supply pipeline, thereby making the gas flow more stable and ensuring the smooth operation of the engine.

[0019] 3. The high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection described in the present invention, after being applied to a gas internal combustion engine, enables the gas internal combustion engine to use multi-point injection technology. Each gas outlet of a connecting block on the lightweight gas rail needs to be installed with a gas injection guide pipe, which enters the cylinder head to spray the gas to the valve. The designed gas injection guide pipe makes it easier for the gas to enter the cylinder.

[0020] 4. In the large-flow lightweight gas rail of a gas internal combustion engine based on multi-point injection described in the present invention, the connecting block plays the role of connecting the intake duct and the engine. Air enters the engine cylinder through the connecting block and enters the cylinder through the valve together with the gas injected in the gas injection guide pipe.

[0021] 5. The large-flow lightweight gas rail of a gas internal combustion engine based on multi-point injection described in the present invention adopts a forked design for the gas injection guide pipe used. The fork angle of the injection guide pipe and the length of the two forks are designed according to the position of the valve in the cylinder head, so that the two forked outlets of the injection pipe can face the valve directly, so that the air sucked into the cylinder can quickly enter the cylinder with the gas injected into the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an axonometric diagram of a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to the present invention;

[0023] Figure 2 It is a front view of a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to the present invention;

[0024] Figure 3 It is a structural schematic diagram of a gas injection guide pipe in a large-flow lightweight gas rail of a gas internal combustion engine based on multi-point injection described in the present invention.

[0025] In the figure: 1. Lightweight gas rail body; 2. Connecting block; 3a. First gas rail air inlet; 3b. Second gas rail air inlet; 4. Solenoid valve; 5. Connecting block gas outlet; 6. Gas injection guide pipe; 6a. Main pipe section; 6b. First branch pipe section; 6c. Second branch pipe section. DETAILED DESCRIPTION

[0026] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment is a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection, which includes a lightweight gas rail body 1, a plurality of connecting blocks 2 and a plurality of gas injection guide pipes 6. A gas rail air cavity is provided inside the lightweight gas rail body 1, and a first gas rail air inlet 3a and a second gas rail air inlet 3b connected to the gas rail air cavity are respectively provided at both ends of the lightweight gas rail body 1. A plurality of gas rail gas outlets are uniformly arranged from left to right along the length direction at the bottom of the lightweight gas rail body 1, and the gas rail gas outlets are connected to the gas rail air cavity. A connecting block 2 is respectively installed on each gas rail gas outlet, and a connecting block gas outlet 5 connected to the gas rail gas outlet is provided on the connecting block 2, and a gas injection guide pipe 6 is installed on each connecting block gas outlet 5.

[0027] In this embodiment, the connection block 2 is arranged between the air intake duct and the engine, and the connection block 2 serves to install and fix the gas rail. The connection block 2 also serves to connect the air intake duct and the engine. The air enters the engine cylinder through the connection block 2, and enters the cylinder through the valve together with the gas injected from the gas injection guide pipe 6. The connection block 2 is a hollow rectangular parallelepiped structure, and two symmetrically arranged connection block threaded holes are processed on the left and right sides of the end face of the connection block 2. The end face of the connection block 2 is connected to the air intake duct through two connecting bolts. The air in the air intake duct flows out through the center hole of the connection block 2 and mixes with the gas flowing out through the gas outlet 5 of the connection block.

[0028] The lightweight gas rail body 1 adopts two-way air intake to ensure the gas flow demand of the high-power LNG gas internal combustion engine. In addition, the two-way air intake is conducive to reducing the pressure fluctuation in the gas supply pipeline, thereby making the gas flow more stable.

[0029] The large-flow lightweight gas rail of the present invention can control the pressure of the gas entering the engine in real time, so that the gas injection valve works in the linear region, and the gas supply is ensured through the coordinated control of pressure and injection pulse width.

[0030] The large-flow lightweight gas rail of the present invention adopts two-way air intake of the gas rail, which reduces the weight of the gas rail while ensuring the large-flow gas demand. Based on the multi-point injection technology, the injection guide pipe is designed to improve the mixing effect of gas and air and enhance the uniformity of the mixed gas in the cylinder.

[0031] Specific implementation method 2: Combination Figures 1 to 3 This embodiment is described. The gas injection guide pipe 6 of this embodiment includes a main pipe section 6a, a first branch pipe section 6b and a second branch pipe section 6c. The head end of the main pipe section 6a is connected to the gas outlet 5 of the connection block, and the end of the main pipe section 6a is connected to the head ends of the first branch pipe section 6b and the second branch pipe section 6c. Other components and connection relationships are the same as those of the first embodiment.

[0032] Specific implementation method three: Combination Figures 1 to 3 To explain this embodiment, the ends of the first branch pipe section 6b and the second branch pipe section 6c of this embodiment are directly opposite to the valve in the cylinder head of the engine. With such a configuration, the gas rail is applied to a gas internal combustion engine, and a multi-point injection technology is used. Each connection block 2 needs to be installed with a gas injection guide pipe 6, so that the gas injection guide pipe 6 enters the cylinder head to spray the gas to the valve. The other components and connection relationships are the same as those of the first or second embodiment.

[0033] Specific implementation method four: Combination Figures 1 to 3This embodiment is described. The bifurcation angle between the first branch pipe section 6b and the second branch pipe section 6c and the length of the first branch pipe section 6b and the second branch pipe section 6c of this embodiment match the position of the valve in the engine cylinder head. In this way, the gas injection guide pipe 6 adopts a bifurcation design. The bifurcation angle between the first branch pipe section 6b and the second branch pipe section 6c and the length of the first branch pipe section 6b and the second branch pipe section 6c are designed according to the position of the valve in the cylinder head, so that the first branch pipe section 6b and the second branch pipe section 6c of the gas injection guide pipe 6 can face the valve directly, so that the air sucked into the cylinder carries the gas injected into the engine and quickly enters the cylinder. Other components and connection relationships are the same as those of the first, second or third specific embodiments.

[0034] Specific implementation method five: Combination Figures 1 to 3 This embodiment is described. This embodiment also includes a plurality of solenoid valves 4. A plurality of valve holes are provided at the upper end of the lightweight gas rail body 1. A solenoid valve 4 is installed on each valve hole. In this way, the solenoid valve 4 is used to control the opening or closing of the gas outlet of the gas rail. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3 or 4.

[0035] Specific implementation method six: Combination Figures 1 to 3 To illustrate this embodiment, the plurality of valve holes in this embodiment correspond to the plurality of gas rail gas outlets one by one. Other components and connection relationships are the same as those in the first, second, third, fourth or fifth embodiment.

[0036] Specific implementation method seven: Combination Figure 1 and Figure 2 To explain this embodiment, a plurality of weight-reducing holes are provided on the lightweight air rail body 1 of this embodiment. With such a configuration, the lightweight air rail adopts a lightweight design, and the weight of the air rail is reduced by hollowing out. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4, 5 or 6.

[0037] Specific implementation method eight: Combination Figure 1 and Figure 2 To illustrate this embodiment, the weight-reducing holes of this embodiment penetrate the upper and lower surfaces of the lightweight air rail body 1. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4, 5, 6 or 7.

[0038] Specific implementation method nine: Combination Figure 1 and Figure 2 This embodiment is described, and the weight-reducing holes and the air rail air cavity of this embodiment are arranged in a staggered manner. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven or eight.

[0039] How it works

[0040] Combination Figures 1 to 3The working principle of a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection described in the present invention is described as follows: the gas enters the gas rail air cavity inside the lightweight gas rail body 1 from the first gas rail air inlet 3a and the second gas rail air inlet 3b to ensure the gas flow demand of the high-power LNG gas internal combustion engine. In addition, the two-way air intake is conducive to reducing the pressure fluctuation in the gas supply pipeline, thereby making the gas flow more stable. The gas entering the gas rail air cavity passes through the connecting block gas outlet 5 on the connecting block 2, and then passes through the first branch pipe section 6b and the second branch pipe section 6c of the gas injection guide pipe 6 to be injected into the cylinder. A bifurcated design is adopted. The angles of the first branch pipe section 6b and the second branch pipe section 6c of the injection guide pipe 6 and the lengths of the two branch pipe sections are designed according to the position of the valve in the cylinder head, so that the outlets of the two branch pipe sections of the injection guide pipe 6 can face the valve directly, so that the air sucked into the cylinder can quickly enter the cylinder with the gas injected into the engine. The air enters the engine cylinder through the connecting block 2, mixes with the gas injected in the injection guide pipe 6, and enters the cylinder through the valve.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection, characterized in that: The invention comprises a lightweight gas rail body (1), a plurality of connecting blocks (2) and a plurality of gas injection guide pipes (6); a gas rail air cavity is provided inside the lightweight gas rail body (1); a first gas rail air inlet (3a) and a second gas rail air inlet (3b) connected to the gas rail air cavity are respectively provided at two ends of the lightweight gas rail body (1); a plurality of gas rail gas outlets are uniformly arranged in sequence from left to right along the length direction at the bottom of the lightweight gas rail body (1); the gas rail gas outlets are connected to the gas rail air cavity; a connecting block (2) is respectively installed on each gas rail gas outlet; a connecting block gas outlet (5) connected to the gas rail gas outlet is provided on the connecting block (2); and a gas injection guide pipe (6) is installed on each connecting block gas outlet (5).

2. According to claim 1, a large-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection is characterized in that: The gas injection guide pipe (6) comprises a main pipe section (6a), a first branch pipe section (6b) and a second branch pipe section (6c); the head end of the main pipe section (6a) is connected to the gas outlet (5) of the connection block, and the tail end of the main pipe section (6a) is simultaneously connected to the head ends of the first branch pipe section (6b) and the second branch pipe section (6c).

3. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 2, characterized in that: The ends of the first branch pipe section (6b) and the second branch pipe section (6c) are directly opposite to the valve in the cylinder head of the engine.

4. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 3, characterized in that: The bifurcation angle between the first branch pipe section (6b) and the second branch pipe section (6c) and the lengths of the first branch pipe section (6b) and the second branch pipe section (6c) match the position of the valve in the engine cylinder head.

5. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 4, characterized in that: It also comprises a plurality of solenoid valves (4); a plurality of valve holes are provided at the upper end of the lightweight air rail body (1); and a solenoid valve (4) is respectively installed on each valve hole.

6. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 5, characterized in that: The multiple valve holes correspond one-to-one to the multiple gas rail gas outlets respectively.

7. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 6, characterized in that: A plurality of weight-reducing holes are provided on the lightweight air rail body (1).

8. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 7, characterized in that: The weight-reducing holes penetrate the upper and lower surfaces of the lightweight air rail body (1).

9. A high-flow lightweight gas rail for a gas internal combustion engine based on multi-point injection according to claim 8, characterized in that: The weight-reducing holes are arranged in a staggered manner with the air rail air cavity.

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