Natural gas engine gas inlet channel spray pipe

Abstract

The utility model provides a natural gas engine air inlet channel spray pipe which comprises an air inlet spray pipe, the upper end of the air inlet spray pipe is used for being communicated with an air inlet pipe, the lower end of the air inlet spray pipe stretches into an engine cylinder body, and the air inlet spray pipe is connected with a fuel gas access pipe stretching into the air inlet spray pipe from outside to inside. The lower opening end, stretching into the gas inlet spray pipe, of the gas inlet pipe downwards faces the lower end of the gas inlet spray pipe, the upper portion of the gas inlet spray pipe communicates with a limiting pipe, the limiting pipe is slidably connected with a telescopic sliding shaft, and the lower end of the telescopic sliding shaft is provided with an air valve used for blocking the lower end of the gas inlet spray pipe. The upper end of the telescopic sliding shaft is provided with a cam contact base used for being matched with an engine cam shaft, and a supporting spring sleeved with the telescopic sliding shaft is arranged between the cam contact base and the limiting pipe. Gas mixing is carried out in the gas inlet spray pipe, the time for mixed gas to enter a cylinder is shortened, the transient response performance of an engine is improved, and even if the mixed gas is ignited, safety accidents of the engine cannot happen.

Description

Technical Field

[0001] The utility model belongs to the field of engines and relates to an air intake nozzle of a natural gas engine. Background Art

[0002] At present, the intake structure of natural gas engines used in the domestic market is premixed intake. Natural gas and air are mixed through a mixer and then enter the intake pipe, and then distributed to each cylinder through the intake manifold for operation. Natural gas and air are premixed through a mixer, and then transported to each cylinder for combustion through a series of complex pipeline systems such as the intake elbow, intake pipe and intake manifold. Although this structure ensures sufficient mixing of the fuel to a certain extent, it faces a series of challenges in practical applications.

[0003] First, there is a significant time delay when the mixed gas flows through the multi-stage pipeline system. This delay will cause a lag in power output when the engine needs to respond quickly, especially during vehicle acceleration, which will affect the driving experience and vehicle performance.

[0004] Secondly, the complex pipeline system increases the risk of accidental ignition of the mixed gas. Since a large amount of mixed gas accumulates in the pipeline, once an abnormal situation occurs, such as high temperature, sparks, etc., the mixed gas may be ignited, leading to a safety accident. Utility Model Content

[0005] The utility model aims to provide an intake nozzle for a natural gas engine, in which gas mixing is performed, the time for the mixed gas to enter the cylinder is shortened, the transient response performance of the engine is improved, and there is only mixed gas in the intake nozzle, so that even if the mixed gas is ignited, no safety accident will occur.

[0006] In order to solve the above technical problems, the utility model provides an intake nozzle of a natural gas engine, including an intake nozzle, the upper end of the intake nozzle is used to communicate with an air intake pipe, the lower end of the intake nozzle extends into the engine cylinder body, the intake nozzle is connected with a gas access pipe extending from the outside to the inside, the lower opening end of the gas access pipe extending into the intake nozzle is downward toward the lower end of the intake nozzle, the upper part of the intake nozzle is connected with a limiting pipe, the limiting pipe is slidably connected with a telescopic sliding shaft, the lower end of the telescopic sliding shaft is provided with a valve valve for blocking the lower end of the intake nozzle, the upper end of the telescopic sliding shaft is provided with a cam contact seat for cooperating with the engine camshaft, and a supporting spring of the telescopic sliding shaft is provided between the cam contact seat and the limiting tube.

[0007] By adopting the above technical scheme, when the cylinder expands, the camshaft squeezes the cam contact seat to compress the support spring, so that the telescopic slide shaft pushes the valve valve and the plugging shaft downward to move downward, opening the lower end of the intake nozzle and the lower end of the gas access pipe, and the natural gas enters the intake nozzle from the gas access pipe to mix with the air, and is sprayed into the cylinder for combustion; when the cylinder is compressed, the camshaft does not squeeze the cam contact seat, and under the action of the support spring, it pulls and pushes the valve valve and the plugging shaft to move upward, blocking the lower end of the intake nozzle and the lower end of the gas access pipe; if the temperature of the valve valve is too high or a spark enters the intake nozzle to ignite the mixed gas, only a small amount of mixed gas in the intake nozzle can be burned, and the force of the gas expansion during combustion can be absorbed by the gas in the pipeline, and the rest of the pipeline will not burn without the mixed gas, and the engine will not have a safety accident.

[0008] The utility model is further configured that the upper end of the valve is provided with a gas blocking shaft for blocking the lower end of the gas inlet pipe.

[0009] The utility model is further configured such that the upper end of the gas blocking shaft is a pointed end capable of extending into the lower end of the gas inlet pipe.

[0010] The utility model is further configured that the air intake nozzle is arc-shaped, and the limiting pipe is arranged on the outer wall of the upper part of the air intake nozzle.

[0011] The utility model is further configured such that the valve is in a trumpet shape with its opening downward.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] First, the present invention performs gas mixing in the intake nozzle. After the accelerator is pressed, the gas is quickly mixed in the intake nozzle and sprayed into the cylinder, which shortens the time for the mixed gas to enter the cylinder and improves the transient response performance of the engine.

[0014] Second, even if high temperature or sparks enter the intake nozzle to ignite the mixed gas, only a small amount of the mixed gas in the intake nozzle will be ignited, and the small amount of kinetic energy generated by the combustion can be easily absorbed by the pipeline. The engine will not have a safety accident due to the ignition of the mixed gas in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a partial cross-sectional view for showing the internal structure of the utility model.

[0017] Among them, 1. Intake nozzle; 2. Gas access pipe; 3. Limiting pipe; 4. Telescopic sliding shaft; 5. Valve; 6. Gas blocking shaft; 7. Cam contact seat; 8. Support spring. DETAILED DESCRIPTION

[0018] The following is a further detailed description of a natural gas engine intake nozzle proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the accompanying drawings represent the same or similar components.

[0019] Example, see Figure 1-2 A natural gas engine intake nozzle comprises an intake nozzle 1, which is arc-shaped, the upper end of the intake nozzle 1 is used to communicate with an air intake pipe, the lower end of the intake nozzle 1 extends into the engine cylinder body, the intake nozzle 1 is connected to a gas access pipe 2 extending from the outside to the inside, and the lower opening end of the gas access pipe 2 extending into the intake nozzle 1 is downward toward the lower end of the intake nozzle 1. The outer wall of the upper part of the intake nozzle 1 is connected to a limit tube 3, and the limit tube 3 is slidably connected to a telescopic sliding shaft 4. The lower end of the telescopic sliding shaft 4 is provided with a valve valve 5 for blocking the lower end of the intake nozzle 1. The valve valve 5 is in a trumpet shape with an opening downward. The upper end of the valve valve 5 is provided with a gas blocking shaft 6 for blocking the lower end of the gas access pipe 2. The upper end of the gas blocking shaft 6 is a tip that can be extended into the lower end of the gas access pipe 2. When the valve valve 5 blocks the lower end of the intake nozzle 1, the gas blocking shaft 6 just blocks the gas access pipe 2. The upper end of the telescopic sliding shaft 4 is provided with a cam contact seat 7 for cooperating with the engine camshaft, and a supporting spring 8 of the outer sleeve telescopic sliding shaft 4 is provided between the cam contact seat 7 and the limit tube 3.

[0020] Working principle: when the cylinder expands, the camshaft squeezes the cam contact seat 7 to compress the support spring 8, so that the telescopic sliding shaft 4 pushes the valve valve 5 and the plugging shaft downward to open the lower end of the intake nozzle 1 and the lower end of the gas access pipe 2, and the natural gas enters the intake nozzle 1 from the gas access pipe 2 to mix with the air and is sprayed into the cylinder for combustion; when the cylinder is compressed, the camshaft does not squeeze the cam contact seat 7, and under the action of the support spring 8, it pulls and pushes the valve valve 5 and the plugging shaft to move upward, blocking the lower end of the intake nozzle 1 and the lower end of the gas access pipe 2; if the temperature of the valve valve 5 is too high or a spark enters the intake nozzle 1 to ignite the mixed gas, only a small amount of mixed gas in the intake nozzle 1 can be burned, and the force of the gas expansion during combustion can be absorbed by the gas in the pipeline, and the rest of the pipeline will not burn without mixed gas, and the engine will not have a safety accident.

[0021] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0022] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A natural gas engine intake nozzle, comprising an intake nozzle (1), characterized in that: The upper end of the intake nozzle (1) is used to communicate with the air intake pipe, and the lower end of the intake nozzle (1) extends into the engine cylinder body. The intake nozzle (1) is connected to a gas access pipe (2) extending from the outside to the inside thereof, and the lower opening end of the gas access pipe (2) extending into the intake nozzle (1) is downwardly directed toward the lower end of the intake nozzle (1). The upper part of the intake nozzle (1) is connected to a limit tube (3), and the limit tube (3) is slidably connected to a telescopic sliding shaft (4). The lower end of the telescopic sliding shaft (4) is provided with a valve valve (5) for blocking the lower end of the intake nozzle (1), and the upper end of the telescopic sliding shaft (4) is provided with a cam contact seat (7) for cooperating with the engine camshaft, and a support spring (8) is provided between the cam contact seat (7) and the limit tube (3) and the telescopic sliding shaft (4) is sheathed.

2. A natural gas engine intake nozzle according to claim 1, characterized in that: The upper end of the gas gate valve (5) is provided with a gas blocking shaft (6) for blocking the lower end of the gas inlet pipe (2).

3. A natural gas engine intake nozzle according to claim 2, characterized in that: The upper end of the gas blocking shaft (6) is a pointed end capable of extending into the lower end of the gas inlet pipe (2).

4. The natural gas engine intake nozzle according to claim 1, characterized in that: The air intake nozzle (1) is arc-shaped, and the limiting tube (3) is arranged on the outer wall of the upper part of the air intake nozzle (1).

5. The natural gas engine intake nozzle according to claim 1, characterized in that: The air gate valve (5) is in a trumpet shape with its opening facing downward.

Images