Air supercharging device and two-stroke engine

Abstract

The utility model belongs to the technical field of internal combustion engines, and relates to an air supercharging device and a two-stroke engine to solve the technical problem that an existing two-stroke engine is poor in fuel economy. Wherein the air supercharging device comprises an air compressor and a pressure stabilizing box; the air compressor is provided with a one-way air inlet and a one-way air outlet, the pressure stabilizing box is provided with an air inlet end and an air outlet end, the one-way air outlet is communicated with the air inlet end of the pressure stabilizing box, the air outlet end of the pressure stabilizing box is provided with a one-way pressure release valve, and the pressure stabilizing box is provided with an air supply hole. The air supercharging device can provide stable air inlet pressure, and the fuel economy of the two-stroke engine is improved.

Description

Technical Field

[0001] This utility model belongs to the field of internal combustion engine technology, and in particular relates to an air supercharging device and a two-stroke engine. Background Technology

[0002] Two-stroke engines are characterized by their compact structure, high power density, and relatively low cost, and are widely used in motorcycles, small boats, garden machinery, and some portable power generation devices. Structurally, a two-stroke engine generally consists of a cylinder, piston, crankshaft, connecting rod, cylinder head, spark plug, intake port, exhaust port, and scavenging port. Its working principle involves two strokes completing one working cycle: the compression stroke and the power stroke. Intake and exhaust occur simultaneously in this cycle, directly completing the air exchange. This simultaneous intake and exhaust characteristic leads to insufficient air exchange; fresh air-fuel mixture easily escapes with the exhaust gas, and exhaust gases are not easily removed completely, resulting in incomplete combustion. Ultimately, this manifests as poor fuel economy, severe emissions, and power and torque that fall short of expectations. These problems significantly limit the application scenarios of two-stroke engines.

[0003] Therefore, in order to solve these problems, a gas boosting device is proposed. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides an air booster and a two-stroke engine.

[0005] In a first aspect, the present invention provides an air booster device, characterized in that it includes an air compressor and a pressure stabilizing box;

[0006] The air compressor is provided with a one-way air inlet and a one-way air outlet. The pressure stabilizing box is provided with an air inlet end and an air outlet end. The one-way air outlet is connected to the air inlet end of the pressure stabilizing box. The air outlet end of the pressure stabilizing box is provided with a one-way pressure relief valve. The pressure stabilizing box is provided with an air supply hole. The air compressor is connected to an external power input device.

[0007] Compared with the prior art, the present invention has the following technical effects:

[0008] The air compressor in this application can provide high-pressure compressed gas, which enters the pressure stabilizing box through a one-way outlet. The air supply port of the pressure stabilizing box can provide the engine with high-pressure gas, improving the engine's fuel combustion performance. The one-way pressure relief valve can relieve pressure, preventing the air pressure in the pressure stabilizing box from becoming too high, and also enabling the air booster to provide a stable intake pressure. Attached Figure Description

[0009] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0010] Figure 1 This is a schematic diagram of a two-stroke engine with mechanical supercharging for air intake, as described in an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram illustrating the working principle of a two-stroke engine.

[0012] Figure 3 This is a schematic diagram illustrating the working principle of an air compressor.

[0013] Engine 1, Combustion chamber 1-1, Spark plug 1-2, Engine cylinder 1-3, Engine piston 1-4, Engine connecting rod 1-5, Engine crankshaft 1-6, Crankcase 1-7, Crankshaft flywheel 1-8, Motor 1-9, Air booster 2, Intake chamber 2-1, One-way intake valve 2-2, Exhaust chamber 2-3, One-way exhaust valve 2-4, Air compressor cylinder 2-5, Air compressor piston 2-6, Air compressor connecting rod 2-7, Air compressor crankshaft 2-8, Pressure stabilizing box 3, One-way reed valve 3-1, Pressure relief valve 3-2. Detailed Implementation

[0014] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0015] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Firstly, see [the following] Figure 1 The air booster device provided by this utility model includes an air compressor 2 and a pressure stabilizing box 3; the air compressor 2 is provided with a one-way air inlet and a one-way air outlet, the pressure stabilizing box 3 is provided with an air inlet end and an air outlet end, the one-way air outlet end is connected to the air inlet end of the pressure stabilizing box 3, the air outlet end of the pressure stabilizing box 3 is provided with a one-way pressure relief valve 3-2, and the pressure stabilizing box 3 is provided with an air supply hole.

[0020] In practice:

[0021] Engine 1 employs mechanical supercharging and includes an engine block 1, an air compressor 2, a pressure regulator 3, a fuel supply system, and a carburetor. The engine block 1 contains engine cylinders 1-3, a crankcase 1-7, a cylinder head, engine pistons 1-4, and an engine crankshaft 1-6. The pistons and crankshaft are connected by connecting rods to transmit power. The crankcase 1-7 has an intake port on its wall, and the cylinder walls have exhaust ports. A scavenging passage connects the crankcase 1-7 and engine cylinders 1-3. A combustion chamber 1-1 is provided between the cylinder head and engine cylinders 1-3, and spark plugs 1-2 are installed on the cylinder head. Both ends of the engine crankshaft 1-6 extend out of the crankcase 1-7. One end connects to a reduction gearbox to output power, and the other end is fitted with a crankshaft flywheel 1-8. A starter motor 1-9 drives the crankshaft flywheel 1-8 to rotate via gear meshing, thus starting the engine. The selected air compressor 2 is a piston type, directly driven by the flywheel end of the engine crankshaft 1-6 via splines, which drives the air compressor crankshaft 2-8. The air compressor 2 has a one-way intake port and a one-way exhaust port. The carburetor is installed on the intake port of the crankcase 1-7 to mix fuel with the intake air, and a throttle valve precisely controls the intake volume of the mixture. The pressure regulator 3 has an air supply port connected to the carburetor intake port; the pressure regulator 3 also has a one-way intake port for drawing in outside air, and a booster intake port (intake end) connected to the one-way exhaust port of the air compressor 2 via a pipe.

[0022] See Figure 1 and Figure 2 As shown, the working principle is as follows: During initial startup, the starter motor 1-9 applies starting torque to the crankshaft flywheel 1-8, causing the engine crankshaft 1-6 to rotate. The engine connecting rod 1-5 drives the engine piston 1-4 upwards, compressing the air-fuel mixture in the engine cylinder 1-3. At top dead center, the spark plug 1-2 ignites the high-pressure air-fuel mixture in the combustion chamber 1-1, performing work on the engine piston 1-4. The engine piston 1-4 then moves downwards, forcing fresh air-fuel mixture from the crankcase 1-7 into the engine cylinder 1-3 through the scavenging passage, and expelling exhaust gas from the exhaust port. The engine piston 1-4 then rises again to compress the air-fuel mixture, completing the working cycle and enabling the engine 1 to reach a self-sustaining operating state. When the engine piston 1-4 moves upwards, the negative pressure in the crankcase 1-7 causes air in the pressure regulating box 3 to be drawn in through the carburetor 4 and mixed with fuel to form a fresh air-fuel mixture. Simultaneously, external air is supplied to the pressure regulating box 3 through the one-way reed valve 3-1. The air compressor 2 is externally mounted on the flywheel side of the engine 1, employing a cylinder-piston structure to achieve intake supercharging.

[0023] The air compressor 2 isolates the intake chamber 2-1 and the exhaust chamber 2-3 at the top of the air compressor cylinder 2-5, and has a one-way intake valve 2-2 on the side of the intake chamber 2-1 and a one-way exhaust valve 2-4 on the side of the exhaust chamber 2-3. The air compressor crankshaft 2-8 rotates with the engine crankshaft 1-6 via a spline connection, driving the air compressor connecting rod 2-7 and the air compressor piston 2-6 to complete the up-and-down stroke working cycle. With each revolution, during the downward stroke of the air compressor piston 2-6, the volume of the air compressor cylinder 2-5 increases, generating negative pressure. This draws in additional air from the outside into the air compressor cylinder 2-5 through the one-way intake valve 2-2. Then, during the upward stroke of the air compressor piston 2-6, the volume of the air compressor cylinder 2-5 decreases, and the air is compressed. When the air pressure reaches the opening value of the one-way exhaust valve 2-4, the compressed air in the cylinder flows at high pressure and high velocity through the exhaust chamber 2-3 and the connecting air passage into the pressure stabilizing box 3. This continues until the air compressor piston 2-6 reaches top dead center, expelling all the air from the air compressor cylinder 2-5 before fresh air is drawn in again. During each cycle, the air compressor 2 naturally draws air into the pressure stabilizing box 3 until the pressure reaches equilibrium, then adds additional intake air to achieve intake pressurization. Furthermore, the pressure regulator 3 maintains the intake air at a specific boost pressure value by controlling the pressure relief valve 3-2. The stable air pressure at the intake ports of engine cylinders 1-3 ensures that the engine has the same boosted intake air volume at a fixed throttle opening and speed, resulting in more complete fuel combustion, ensuring increased engine power and torque, stable operation, and improved fuel economy.

[0024] In this application, the air compressor 2 is directly driven by the engine crankshaft 1-6 to complete the air pumping work, which reduces space occupation and improves transmission efficiency.

[0025] In this application, the air compressor 2 adopts the working mode of cylinder piston and one-way exhaust valve 2-4 to first draw in external air in each revolution and then pressurize the air in the cylinder and discharge it into the pressure stabilizing box 3, so that the pressure value of the boosted air intake and the crankshaft phase have a certain degree of controllability.

[0026] In this application, in order to ensure that the engine cylinders 1-3 have a stable boosted intake pressure and to improve the boosted intake lag problem of the air compressor 2, a one-way intake reed valve (one-way reed valve 3-1) and a pressure relief valve 3-2 for pressure control are integrated in the pressure stabilizing box 3, so that the intake pressure of the engine 1 will not be too low or too high momentarily.

[0027] In this application, in order to ensure that the air entering the engine cylinders 1-3 is clean and pure, an air filter is integrated into the external air intake of the air compressor 2 and the pressure stabilizing box 3.

[0028] In this application, a choke and a throttle valve are integrated into the carburetor to achieve precise control of the cylinder intake volume.

[0029] As one possible implementation, the voltage regulator box 3 is also provided with multiple air inlets, each of which is equipped with a one-way reed valve 3-1 that opens into the voltage regulator box 3.

[0030] The air inlet, in conjunction with the one-way reed valve 3-1, ensures the stability of the gas pressure inside the pressure stabilizing box 3.

[0031] In one possible implementation, the air compressor 2 includes a piston chamber, an air compressor piston 2-6, an air compressor connecting rod 2-7, an air compressor crankshaft 2-8, an intake chamber 2-1, and an exhaust chamber 2-3. The air compressor piston 2-6 is slidably connected to the piston chamber. Both ends of the air compressor connecting rod 2-7 are hinged to one end of the air compressor piston 2-6 and one end of the air compressor crankshaft 2-8, respectively. The other end of the air compressor crankshaft 2-8 is fixedly connected to the output end of the power unit. The intake chamber 2-1 and the exhaust chamber 2-3 are located at the end of the piston chamber away from the air compressor connecting rod 2-7. The intake chamber 2-1 and the exhaust chamber 2-3 communicate with the piston chamber. A one-way intake valve 2-2 is provided between the intake chamber 2-1 and the piston chamber. A one-way exhaust valve 2-4 is provided between the exhaust chamber 2-3 and the piston chamber. The exhaust chamber 2-3 communicates with the pressure stabilizing box 3.

[0032] The air compressor 2 is installed to compress air and ensure the continuity of air compression, so as to provide stable high-pressure gas for the pressure stabilizing box 3.

[0033] As one possible implementation, the pressurization device also includes an air filter; the air filter is disposed at the one-way air inlet of the air compressor 2 and the air inlet of the pressure stabilizing box 3.

[0034] The air filter ensures the cleanliness of the gas entering the air compressor 2 and the pressure regulating box 3.

[0035] Secondly, this utility model also provides a two-stroke engine including an air booster device, wherein the air booster device is fixedly connected to the engine 1, the air compressor crankshaft 2-8 is fixedly connected to the engine crankshaft 1-6, and the air supply port is connected to the engine carburetor.

[0036] The use of air-supercharged two-stroke engines ensures increased engine power and torque while maintaining stable operation, thus improving fuel economy.

[0037] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An air pressurizing device characterized by comprising: The air compressor and the pressure stabilizing tank are included; The air compressor is provided with a one-way air inlet and a one-way air outlet, the pressure stabilizing tank is provided with an air inlet end and an air outlet end, the one-way air outlet is communicated with the air inlet end of the pressure stabilizing tank, the air outlet end of the pressure stabilizing tank is provided with a one-way pressure relief valve, and the pressure stabilizing tank is provided with a gas supply hole.

2. The air charging device of claim 1, wherein The pressure stabilizing tank is further provided with a plurality of air inlet holes, each of which is provided with a one-way reed valve opening into the pressure stabilizing tank.

3. The air charging device of claim 1, wherein The air compressor includes a piston cavity, an air compressor piston, an air compressor connecting rod, an air compressor crankshaft, an air inlet cavity and an air outlet cavity. The air compressor piston is in sliding connection with the piston cavity, two ends of the air compressor connecting rod are respectively hinged to the air compressor piston and one end of the air compressor crankshaft, the other end of the air compressor crankshaft is fixedly connected with the output end of a power input device, the air inlet cavity and the air outlet cavity are arranged at one end of the piston cavity away from the air compressor connecting rod, the air inlet cavity and the air outlet cavity are communicated with the piston cavity, a one-way air inlet valve is arranged between the air inlet cavity and the piston cavity, a one-way air outlet valve is arranged between the air outlet cavity and the piston cavity, and the air outlet cavity is communicated with the pressure stabilizing tank.

4. The air charging device of claim 2, wherein The supercharging device further includes an air filter; The air filter is arranged at the one-way air inlet of the air compressor and the air inlet hole of the pressure stabilizing tank.

5. A two-stroke engine comprising the air charging device according to any one of claims 1 to 4, characterized in that The air supercharging device is fixedly connected with a two-stroke engine, the air compressor crankshaft is fixedly connected with the engine, and the gas supply hole is communicated with a carburetor of the engine.

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