CN115523019A - Engine adopting targeted beam scavenging combustion technology - Google Patents

Abstract

The invention discloses a targeted beam scavenging gas combustion technology engine, which relates to the technical field of internal combustion engines. It includes crankcase, crankshaft and connecting rod group, cylinder block, piston, and targeted flow pad. The cylinder body is equipped with air inlet, scavenging port, and main and auxiliary scavenging channels; the targeted flow pad is equipped with two different structural beams. Orifice, the corresponding position of the main scavenging channel is equipped with a circular targeting beam hole with a diameter of 5 mm, and the corresponding position of the auxiliary scavenging channel is equipped with a special-shaped targeting beam hole. Compared with the prior art, the invention has the advantages of greatly improving the scavenging efficiency and reducing the discharge of compounds such as HC and CO in the tail gas.

Description

A targeted beam scavenging combustion technology engine

technical field

The invention relates to the technical field of internal combustion engines, in particular to a targeted beam flow engine.

Background technique

At present, low-emission two-stroke gasoline engines generally adopt two structures. One is to add a catalytic conversion device to the muffler on the basis of the original engine to reduce the discharge of harmful gases such as HC and CO. The content of precious metals in the catalyst is generally above 50g. The other is the use of layered scavenging technology, where a part of the air is pre-stored in the scavenging channel and scavenged first, so as to reduce the phenomenon that the mixed gas is directly discharged with the exhaust gas without burning, and effectively reduce the harmful components in the exhaust gas to protect the environment. It has been proved by practice that directly increasing the catalyst in the muffler to reduce the discharge of harmful gases will easily cause the engine temperature to be too high and reduce the service life of the engine. The use of layered scavenging technology is currently facing two problems. First, this technology is currently protected by foreign patents and cannot be fully used. It has a great impact on the reduction of harmful gases such as HC and CO emissions. If it is to meet domestic and international emission requirements, the muffler needs to be used. Add a small amount of catalyst. The processing and manufacturing cost of the second layered scavenging technology is relatively high, which is not conducive to large-scale promotion. Therefore, there is an urgent need for a two-stroke gasoline engine that can effectively reduce the emission of harmful gases without increasing the cost and does not affect the service life of the engine, which can effectively protect the environment and bring economic benefits to the society.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an engine with targeted beam scavenging combustion technology. When the piston performs work and goes down, the mixed oil and gas stored in the crankcase chamber is compressed and the pressure is increased, and the mixed oil and gas pass through the box and the cylinder. The targeted beam holes between the bodies flow into the main and auxiliary scavenging channels accurately and at high speed; the main and auxiliary scavenging channels have different structures, different paths, and different scavenging effects; High-speed fluidity is generated in the channel, and vortex is generated during scavenging, which greatly improves the scavenging efficiency and reduces the emission of compounds such as HC and CO in the exhaust gas.

In order to solve the technical problems, the present invention provides a targeted beam scavenging combustion technology engine, including a crankcase, a crankshaft connecting rod group, a cylinder block, a piston, and a targeted beam pad, and the cylinder block is provided with an air inlet, a sweep Air port, main and auxiliary scavenging channels; the targeting beam pad is provided with two beam holes with different structures, the corresponding position of the main scavenging channel is provided with a circular targeting beam hole with a diameter of 5mm, and the corresponding position of the auxiliary scavenging channel is set There are special-shaped targeting beam holes.

Preferably, the cross-sectional area a of the circular beam orifice and the cross-sectional area of the special-shaped beam orifice b, a:b=1:1.2, and the special-shaped beam orifice changes irregularly according to the structure of the auxiliary scavenging air channel.

Compared with the prior art, the targeted beam scavenging combustion technology engine of the present invention has the following technical effects: the beam hole of the main scavenging channel relies on the circular structure of the high-speed air flow to start scavenging with the auxiliary scavenging channel first, and then the mixed oil and gas pass through the special-shaped The beam hole enters the scavenging channel to continue scavenging; the gas passes through the main beam hole and the special-shaped beam hole to produce different fluidity in the cylinder scavenging channel, and when the gas flows into the combustion chamber, a vortex is generated, which greatly improves the scavenging efficiency. Reduce the emission of compounds such as HC and CO in the exhaust gas.

Description of drawings

Fig. 1 is the structural representation of the target beam scavenging combustion technology engine of the present invention;

Figure 2 is a schematic diagram of the operation of the engine shown in Figure 1;

Fig. 3 is a schematic structural view of the engine in Fig. 2 along the G-G direction;

Fig. 4 is a schematic diagram of the structure of the engine block scavenging passage shown in Fig. 1 .

detailed description

The present invention is described in detail below in conjunction with accompanying drawing:

As shown in Figure 1-4, in the figure: 1. Air filter combination, 2. Carburetor combination, 3. Intake pipe combination, 4. Muffler combination, 5. Catalyst, 6. Cylinder block, 7. Crankshaft, 8 , Cylinder intake port, 9, Target beam pad, 10 Combustion chamber, 11, Piston combination, 12, Cylinder exhaust port, 13, Connecting rod, 14, Crankcase chamber, 15, Special-shaped target beam Holes, 16, circular targeting beam holes, 17, crankcase combination, 18, auxiliary scavenging air passage, 19, main scavenging air passage.

It includes intake passage 20 (air filter combination 1, carburetor combination 2, intake pipe 3), exhaust passage (cylinder block exhaust port 8, muffler combination 4, catalyst 5), cylinder block 6 (cylinder block intake Air port 8, cylinder exhaust port 12, combustion chamber 10), crankshaft-connecting rod combination (crankshaft 7, connecting rod 13), targeted beam pad 9 (special-shaped targeted beam hole 15, circular targeted beam hole 16), piston assembly 11, crankcase 17 (crankcase chamber 14), secondary scavenging air passage 18, main scavenging air passage 19. The lower opening of the cylinder block 6 is mounted on the upper opening of the crankcase 17, and the inner chamber of the cylinder communicates with the crankcase chamber 14. When the piston assembly 11 reciprocates in the inner chamber of the cylinder, the connecting rod 13 drives the cylinder mounted in the crankcase chamber 14. The crankshaft 7 rotates. The upper edge of the piston and the inner wall of the cylinder block 6 form a combustion chamber 10 .

The air filter assembly 1 , the carburetor assembly 2 , and the intake pipe assembly 3 are sequentially installed on the cylinder block 6 to form a mixture intake channel 20 .

The muffler assembly 4 and the catalyst 5 are installed on the cylinder body 6 in sequence to form an exhaust passage 21 . The exhaust gas in the combustion chamber is discharged to the outside of the combustion chamber; the special-shaped targeting beam hole 15 and the circular targeting beam hole 16 are symmetrically distributed on both sides of the targeting beam pad 9 . The targeted beam pad 9 is located between the crankcase assembly 17 and the cylinder block 6 .

The position of the special-shaped targeting beam hole 15 corresponds to the main scavenging air channel of the cylinder body 6, forming the main scavenging air channel. The position of the circular targeting beam hole 16 corresponds to the secondary scavenging channel 18 of the cylinder body 6 to form a secondary scavenging channel.

Specific working process:

When the piston moves upward, the mixture in the cylinder is compressed, and at the same time, the volume of the crank chamber below the piston increases to form a negative pressure. When the lower edge of the piston skirt opens the mixed gas inlet, the mixed gas is sucked into the crank chamber through the mixed gas inlet channel formed by the air filter, carburetor, intake pipe, and cylinder block. When the piston moves upward and approaches the top dead center, the spark plug emits The electric spark ignites the compressed gas mixture, and the high-temperature and high-pressure gas expansion after combustion forces the piston to move downward, closing the gas inlet port of the gas mixture, and the combustible gas mixture sucked into the crank chamber is pre-compressed due to the downward movement of the piston. Positive pressure, part of the mixed gas in the crankcase enters the main scavenging channel at high speed and accurately through the circular targeted beam hole, and the other part of the mixed gas enters the auxiliary scavenging channel through the special-shaped targeted beam hole at high speed and accurately, and enters the main scavenging channel first. Because the mixed steam in the air channel passes through the circular targeting beam hole with a small cross-sectional area, the mixed steam has a high flow rate, and the mixed steam entering the auxiliary scavenging channel passes through the special-shaped targeting beam hole with a large cross-sectional area, although the flow rate is lower than The mixed steam flow rate in the main scavenging channel, but after passing through the special-shaped targeting beam hole, the mixed steam forms a mixed steam with uniform distribution and different pressures in the auxiliary scavenging channel. When the piston continues to descend, the exhaust port is opened, and part of the exhaust gas flows into the atmosphere from the muffler through the exhaust port. Since there are targeted beam holes on both sides of the targeted beam pad, and the structure of the targeted beam hole, The paths are different, therefore, the scavenging gas with different flow rates forms a vortex in the combustion chamber, which improves the scavenging efficiency, reduces the emission of compounds such as HC and CO in the exhaust gas, and also reduces the fuel consumption rate of the machine accordingly.

The beneficial effect is: the main beam hole relies on the circular structure of the high-speed airflow to start scavenging with the auxiliary scavenging channel first, and then the mixed oil and gas pass through the special-shaped beam hole and the mixed steam is uniformly distributed but at different pressures and enters the scavenging channel to continue scavenging. The gas passes through the main beam hole and the special-shaped beam hole to produce different fluidity in the cylinder scavenging channel. When the gas flows into the combustion chamber, a vortex is generated, which greatly improves the scavenging efficiency and reduces the emission of compounds such as HC and CO in the exhaust gas.

Apparently, the specific implementation of the present invention is not limited by the above-mentioned specific implementation, as long as various insubstantial improvements are made by adopting the structural concepts and technical solutions of the present invention, they all fall within the scope of protection of the present invention.

Claims (2)

1. A targeted beam scavenging combustion technology engine comprises a crankcase, a crankshaft connecting rod group, a cylinder body, a piston and a targeted beam gasket, wherein the cylinder body is provided with an air inlet, a scavenging port and a main scavenging passage and an auxiliary scavenging passage; the method is characterized in that: the target beam current cushion is provided with two different structure beam current holes, the corresponding position of the main scavenging passage is provided with a circular target beam current hole with the diameter of 5mm, and the corresponding position of the auxiliary scavenging passage is provided with a special-shaped target beam current hole.

2. The engine adopting the targeted beam scavenging combustion technology as claimed in claim 1, is characterized in that: the cross-sectional area a of the circular beam hole, the cross-sectional area b of the special-shaped beam hole, a: b =1:1.2, the irregular beam current holes are irregularly changed according to the structure of the auxiliary scavenging passage.

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