A pre-mixed natural gas engine porous vane system

Abstract

The utility model discloses a kind of natural gas engine porous fan systems of air inlet channel premixing, including gas supply device, mixed pipe chamber and air inlet elbow;Gas injection valve is equipped between gas supply device and mixed pipe chamber, gas draft tube is installed in the natural gas import of mixed pipe chamber, gas draft tube guides the natural gas that gas injection valve sprays into the mixing chamber of mixed pipe chamber, and in the mixing chamber, guided natural gas is from three directions, each direction is again with the supercharged air that enters mixing chamber in the way of spraying multiple small air current and carries out careful mixing;Multiple fan blade mixing device is equipped between mixed pipe chamber and air inlet elbow, and the multiple fan blade mixing device is driven rotation by the mixed gas after careful mixing, and the mixed gas that flows is decomposed again and mixed.The utility model is simple in structure, safe and reliable, can make the mixture of natural gas and air more uniform by the method of decomposition, rotation, re-mixing, to guarantee the uniformity of combustion.

Description

Technical Field

[0001] This utility model relates to the technical field of natural gas engines, and in particular to a porous fan blade system for a natural gas engine with premixed intake manifold. Background Technology

[0002] As a premixed type of natural gas engine, the degree of mixing during the premixing stage directly determines the engine's power output, fuel economy, and emissions. Existing premixing technologies mostly mix air and natural gas by creating turbulence and vortices through the collision of air and natural gas, but the effect is poor. Most gases cannot be completely and evenly mixed, leading to an overly rich mixture (incomplete combustion) causing knocking or an overly lean mixture causing misfire, resulting in reduced power. Furthermore, an overly rich mixture causes incomplete combustion, producing harmful substances such as carbon monoxide and unburned hydrocarbons. Incomplete combustion also increases fuel consumption, with unburned gases being directly discharged through the exhaust pipe, resulting in waste. An overly lean mixture can also cause unstable engine idling and misfires. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a porous fan blade system for natural gas engines with a simple structure, safety and reliability, and the ability to further enhance the mixing of natural gas after the initial mixing, in light of the existing technology.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A premixed intake manifold for a natural gas engine with a porous fan blade system includes a mixing chamber for uniformly mixing natural gas supplied by a gas supply device with pressurized air, and an intake bend for introducing the mixed gas into the engine combustion chamber. A gas injection valve is provided between the gas supply device and the mixing chamber. A gas guide pipe is installed in the natural gas inlet of the mixing chamber, which guides the natural gas injected by the gas injection valve into the mixing chamber of the mixing chamber. In the mixing chamber, the guided natural gas is finely mixed with the pressurized air entering the mixing chamber from three directions, each direction ejecting multiple small gas streams. A porous fan blade mixing device is provided between the mixing chamber and the intake bend. The porous fan blade mixing device is driven to rotate by the finely mixed gas, further decomposing and mixing the flowing gas.

[0005] To optimize the above technical solution, the specific measures also include: The aforementioned gas supply device consists of a natural gas main pipe, a single-cylinder corrugated pipe, and a supply pipe. Natural gas with a certain pressure flows through the natural gas main pipe. The inlet end of the single-cylinder corrugated pipe is connected to the natural gas main pipe, and the outlet end of the single-cylinder corrugated pipe is connected to the inlet end of the supply pipe. The outlet end of the supply pipe is connected to the inlet end of the gas injection valve.

[0006] The aforementioned mixing chamber is a conical cavity that is larger at the top and smaller at the bottom. The natural gas inlet of the mixing chamber is radially connected to the mixing chamber, and the natural gas inlet is fixedly connected to the outlet end of the gas injection valve.

[0007] The upper port of the aforementioned mixing chamber constitutes the mixed gas outlet, and the lower port of the mixing chamber constitutes the pressurized air inlet; the diameter of the mixed gas outlet is larger than the diameter of the pressurized air inlet.

[0008] The aforementioned gas diversion pipe consists of a main body extending into the mixing chamber and a pipe seat integrally connected to the gas inlet end of the main body; the pipe seat is bolted and installed in the natural gas inlet of the mixing chamber; the main body has three rows of injection holes that can make the natural gas spray out in three directions, and each injection hole group consists of multiple injection holes arranged in a line.

[0009] The three-row injection hole group includes a central injection hole group that sprays vertically upwards and flank injection hole groups that are symmetrically located on the left and right sides of the central injection hole group and spray upwards at an angle of 10 to 15 degrees.

[0010] The aforementioned porous fan blade mixing device consists of a fixed connecting pipe and a porous fan blade assembly rotatably installed in the fixed connecting pipe; the lower port of the fixed connecting pipe is connected to the mixed gas outlet of the mixing chamber, and the upper port of the fixed connecting pipe is connected to the lower port of the inlet bend.

[0011] The aforementioned porous fan blade assembly comprises a rotating shaft and multiple porous fan blades fixedly mounted on the rotating shaft; both the upper and lower ends of the rotating shaft are rotatably supported in a fixed connecting pipe via thrust bearings.

[0012] The aforementioned porous fan blades have multiple small holes evenly distributed on them, which can further decompose the flowing mixed gas into multiple small airflows.

[0013] The aforementioned gas injection valve is connected to an ECU for signal control of its opening or closing.

[0014] Compared with existing technologies, this invention features a gas diversion pipe installed in the natural gas inlet of the mixing chamber. This pipe has three rows of injection holes, which decompose a stream of natural gas into multiple small gas streams that are then finely mixed with the pressurized air entering the mixing chamber. Furthermore, this invention includes a porous fan-blade mixing device between the mixing chamber and the intake bend. The porous fan blades of this device have multiple evenly distributed fan-blade holes. As part of the mixed gas flows through the fan-blade holes of the device, it is further decomposed into multiple small gas streams. These decomposed gas streams, along with the main gas stream that did not pass through the fan-blade holes, are further intensified by the rotation of the porous fan-blade mixing device, resulting in a more uniform mixture of natural gas and air. This ensures uniform combustion, improves combustion efficiency and power, reduces fuel consumption, and controls harmful emissions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the gas supply device of this utility model; Figure 3 This is a schematic diagram of the structure of the hybrid tube chamber of this utility model; Figure 4 This is a schematic diagram of the gas diversion pipe of this utility model; Figure 5 yes Figure 4 The left view; Figure 6 This is a schematic diagram of the structure of the porous fan blade mixing device of this utility model. Detailed Implementation

[0016] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0017] Figures 1 to 6 This is a schematic diagram of the structure of this utility model.

[0018] The attached figures are labeled as follows: 1. Gas supply device; 11. Natural gas main pipe; 12. Single-cylinder bellows pipe; 13. Supply pipe; 2. Gas injection valve; 3. Mixing chamber; 3a. Natural gas inlet; 3b. Mixed gas outlet; 3c. Boost air inlet; 3d. Gas diversion pipe; 4. Pipe body; 41. Injection orifice; 41a. Central injection orifice group; 411. Side wing injection orifice group; 412. Pipe seat; 42. Multi-hole fan blade mixing device; 5. Fixed connecting pipe; 51. Rotating shaft; 52. Multi-hole fan blade; 53. Fan blade orifice; 53a. Thrust bearing; 54. Intake bend; 6. ECU; 7.

[0019] like Figures 1 to 6As shown, this utility model discloses a premixed intake manifold for a natural gas engine with a porous fan blade system. The system includes a gas supply device 1, a mixing chamber 3, and an intake bend 6. The gas supply device 1 provides natural gas at a certain pressure. The mixing chamber 3 is connected to an intake box for pressurizing air, and its interior is used to uniformly mix the natural gas supplied by the gas supply device 1 with the pressurized air. The intake bend 6 guides the mixture of natural gas and pressurized air to the engine combustion chamber for use.

[0020] like Figure 1 As shown, this invention includes a gas injection valve 2 between the gas supply device 1 and the mixing chamber 3. The gas injection valve 2 is connected to an ECU 7 for signal control of its opening and closing. The ECU 7 can intelligently control the amount of natural gas injected into the mixing chamber 3 by the gas injection valve 2 in each cycle. A gas guide pipe 4 is installed in the natural gas inlet 3a of the mixing chamber 3. This gas guide pipe 4 guides the natural gas injected by the gas injection valve 2 into the mixing chamber 3b. Furthermore, the gas guide pipe 4 guides the natural gas to be ejected from the mixing chamber 3b from three directions, each direction ejecting multiple small streams of natural gas to uniformly and finely mix with the pressurized air entering the mixing chamber 3b. A porous fan-blade mixing device 5 is added between the mixing chamber 3 and the inlet bend 6. When the finely mixed gas passes through, the porous fan-blade mixing device 5 rotates under the drive of the gas flow, further decomposing the mixed gas into multiple small streams before mixing again, thus making the mixing of natural gas and air more uniform.

[0021] In the embodiments, as shown Figure 2 As shown, the gas supply device 1 of this utility model consists of a natural gas main pipe 11, a single-cylinder bellows pipe 12, and a supply pipe 13. Natural gas with a certain pressure flows through the natural gas main pipe 11. The inlet end of the single-cylinder bellows pipe 12 is connected to the natural gas main pipe 11, and the outlet end of the single-cylinder bellows pipe 12 is connected to the inlet end of the supply pipe 13. The outlet end of the supply pipe 13 is connected to the inlet end of the gas injection valve 2. Natural gas can sequentially pass through the natural gas main pipe 11, the single-cylinder bellows pipe 12, and the supply pipe 13 into the gas injection valve 2.

[0022] In the embodiments, as shown Figure 3 As shown, the mixing chamber 3b of this invention is a conical cavity that is larger at the top and smaller at the bottom. The natural gas inlet 3a of the mixing tube 3 is radially connected to the mixing chamber 3b, and the natural gas inlet 3a is fixedly connected to the outlet end of the gas injection valve 2 by bolts. To prevent gas leakage, two sealing rings are press-fitted between the mixing tube 3 and the gas injection valve 2.

[0023] The upper port of the mixing chamber 3b of this invention constitutes the mixed gas outlet 3c, and the lower port of the mixing chamber 3b constitutes the pressurized air inlet 3d; the diameter of the mixed gas outlet 3c is larger than the diameter of the pressurized air inlet 3d.

[0024] like Figure 4 and Figure 5 As shown, the gas diversion pipe 4 of this utility model consists of a pipe body 41 extending into the mixing chamber 3b and a pipe seat 42 integrally connected to the gas inlet end of the pipe body 41. The pipe seat 42 is formed with bolt holes, and a positioning cavity adapted to the pipe seat 42 is formed in the natural gas inlet 3a, so that the pipe seat 42 can be installed in the natural gas inlet 3a of the mixing chamber 3 by bolt positioning.

[0025] The reason why natural gas can be ejected from three directions is that the main body of the pipe 41 has three rows of injection holes that allow the natural gas to be ejected in three directions. The key to ejecting multiple small gas streams is that each injection hole group consists of multiple injection holes 41a arranged in a straight line. The three rows of many injection holes 41a can decompose a stream of natural gas entering the gas inlet pipe 4 into multiple small gas streams of natural gas in three directions, thereby improving the uniformity of the mixing of natural gas and pressurized air.

[0026] from Figure 5 As can be seen, the three-row injection hole group of this utility model includes a central injection hole group 411 that sprays vertically upwards and side wing injection hole groups 412 that are symmetrically located on the left and right sides of the central injection hole group 411 and spray upwards at an angle. The angle between the plane where the side wing injection hole group 412 is located and the plane where the central injection hole group 411 is located is 10 degrees to 15 degrees.

[0027] In the embodiments, as shown Figure 6 As shown, the porous fan blade mixing device 5 of this utility model consists of a fixed connecting pipe 51 and a porous fan blade assembly rotatably installed in the fixed connecting pipe 51. The lower port of the fixed connecting pipe 51 is connected to the mixed gas outlet 3c of the mixing chamber 3b, and the upper port of the fixed connecting pipe 51 is connected to the lower port of the air inlet bend 6.

[0028] The porous fan blade assembly of this utility model consists of a rotating shaft 52 and multiple porous fan blades 53 fixedly mounted on the rotating shaft 52; both the upper and lower ends of the rotating shaft 52 are rotatably supported in the fixed connecting pipe 51 via thrust bearings 54. When airflow passes through the fixed connecting pipe 51, the airflow acts on the porous fan blades 53, thereby driving the porous fan blade assembly to rotate.

[0029] The porous fan blade 53 has a number of fan blade holes 53a evenly distributed on it. After the mixed gas enters the fixed pipe 51, a part of the airflow will pass through the fan blade holes 53a to form a split. These airflows passing through the fan blade holes 53a cause part of the original mixed gas to be decomposed into multiple small airflows again. During the rotation of the porous fan blade assembly, the multiple small airflows are mixed again with the main airflow that has not passed through the fan blade holes 53a, so that the original mixed gas is mixed more evenly.

[0030] The premixing method of the premixed natural gas engine multi-hole fan blade system of this utility model is as follows: When natural gas passes through the gas inlet pipe 4, because the gas inlet pipe 4 is provided with three rows of injection holes, and each row of injection holes is provided with multiple injection holes 41a, when the natural gas is ejected through these three rows of injection holes, the airflow will flow in three directions, and the natural gas in each direction will be divided into multiple small airflows by the injection holes 41a. These multiple small airflows will then be mixed more finely with the pressurized air. When the mixture of natural gas and air passes through the porous fan blade mixing device 5, the mixture drives the porous fan blade 53 to rotate. At the same time, the mixture also mixes along the direction of rotation of the porous fan blade 53. Turbulent airflow vortices are easily formed on the back and edge of the porous fan blade 53, making the mixture more uniform. The fan blade holes 53a on the porous fan blade 53 also help to split the mixture into multiple small airflows when it passes through. A part of the mixture mixes with the main mixing airflow again after passing through the fan blade holes 53a. At the same time, the edge of the fan blade holes 53a will disturb the passing airflow, causing the split airflow to form tiny vortices after passing through, thus enhancing the mixing.

[0031] The above embodiments provide a systematic and detailed description of the present utility model. These are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A premixed intake manifold for a natural gas engine with a porous fan blade system, comprising a mixing chamber (3) for uniformly mixing natural gas supplied by a gas supply device (1) with pressurized air and an intake bend (6) for introducing the mixed gas mixture into the engine combustion chamber; characterized in that: A gas injection valve (2) is provided between the gas supply device (1) and the mixing chamber (3). A gas guide pipe (4) is installed in the natural gas inlet (3a) of the mixing chamber (3). The gas guide pipe (4) guides the natural gas injected by the gas injection valve (2) to the mixing chamber (3b) of the mixing chamber (3). In the mixing chamber (3b), the guided natural gas is finely mixed with the pressurized air entering the mixing chamber (3b) from three directions, each direction ejecting multiple small airflows. A porous fan blade mixing device (5) is provided between the mixing chamber (3) and the air inlet bend (6). The porous fan blade mixing device (5) is driven to rotate by the finely mixed gas, and decomposes and mixes the flowing mixed gas again.

2. The porous fan blade system for a premixed natural gas engine in the intake duct according to claim 1, characterized in that: The gas supply device (1) consists of a natural gas main pipe (11), a single-cylinder corrugated pipe (12) and a supply pipe (13); natural gas with a certain pressure flows in the natural gas main pipe (11), the inlet end of the single-cylinder corrugated pipe (12) is connected to the natural gas main pipe (11), the outlet end of the single-cylinder corrugated pipe (12) is connected to the inlet end of the supply pipe (13), and the outlet end of the supply pipe (13) is connected to the inlet end of the gas injection valve (2).

3. The porous fan blade system for a premixed natural gas engine in the intake duct according to claim 2, characterized in that: The mixing chamber (3b) is a conical cavity that is larger at the top and smaller at the bottom. The natural gas inlet (3a) of the mixing tube (3) is radially connected to the mixing chamber (3b). The natural gas inlet (3a) is fixedly connected to the outlet end of the gas injection valve (2).

4. The porous fan blade system for a premixed natural gas engine in the intake duct according to claim 3, characterized in that: The upper port of the mixing chamber (3b) forms a mixed gas outlet (3c), and the lower port of the mixing chamber (3b) forms a pressurized air inlet (3d); the diameter of the mixed gas outlet (3c) is larger than the diameter of the pressurized air inlet (3d).

5. A premixed natural gas engine porous fan blade system according to claim 4, characterized in that: The gas diversion pipe (4) consists of a pipe body (41) extending into the mixing chamber (3b) and a pipe seat (42) integrally connected to the gas inlet end of the pipe body (41); the pipe seat (42) is bolted and installed in the natural gas inlet (3a) of the mixing chamber (3); the pipe body (41) is formed with three rows of injection holes that can make the natural gas spray out in three directions, and each injection hole group consists of multiple injection holes (41a) arranged in a line.

6. The porous fan blade system for a premixed natural gas engine in the intake duct according to claim 5, characterized in that: The three rows of jet holes include a central jet hole group (411) that sprays vertically upwards and flank jet hole groups (412) that spray upwards at an angle to the left and right sides of the central jet hole group (411); the angle between the plane of the flank jet hole group (412) and the plane of the central jet hole group (411) is 10 to 15 degrees.

7. A premixed natural gas engine porous fan blade system according to claim 6, characterized in that: The porous fan blade mixing device (5) consists of a fixed pipe (51) and a porous fan blade assembly rotatably installed in the fixed pipe (51); the lower port of the fixed pipe (51) is connected to the mixed gas outlet (3c) of the mixing chamber (3b), and the upper port of the fixed pipe (51) is connected to the lower port of the air inlet bend (6).

8. The inlet premixed natural gas engine porous fan blade system according to claim 7, characterized in that: The porous fan blade assembly comprises a rotating shaft (52) and multiple porous fan blades (53) fixedly mounted on the rotating shaft (52); both the upper and lower ends of the rotating shaft (52) are rotatably supported in the fixed connecting pipe (51) by thrust bearings (54).

9. A premixed natural gas engine porous fan blade system according to claim 8, characterized in that: The porous fan blade (53) has multiple fan blade holes (53a) evenly distributed on it, which can decompose the flowing mixed gas into multiple small airflows.

10. A premixed natural gas engine porous fan blade system according to claim 9, characterized in that: The gas injection valve (2) is connected to an ECU (7) for signal control of its opening or closing.

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