Two-stroke fuel oil machine

Abstract

The invention relates to the technical field of two-stroke fuel oil machines, in particular to a two-stroke fuel oil machine which comprises a machine body provided with an air inlet channel and an air outlet channel, a compression structure is arranged on the machine body and comprises a pump body and a cam unit connected with the pump body, and the cam unit is arranged in the pump body; a first pump body cavity is formed in the pump body, and the cam unit can drive the size of the first pump body cavity to be increased or decreased; the fuel pump further comprises a main oil way balance channel and a main fuel gas mixture conveying channel, one end of the main oil way balance channel and one end of the main fuel gas mixture conveying channel both communicate with the first pump body cavity, and the other end of the main fuel gas mixture conveying channel communicates with the first cavity. The other end of the oil way balance main channel is used for being communicated with an air inlet channel and / or the second cavity, and the problem that in the scavenging process of an existing two-stroke fuel engine, tail gas emission pollution is high is solved.

Description

Technical Field

[0001] The invention relates to the technical field of two-stroke fuel engines, and in particular to a two-stroke fuel engine. Background Art

[0002] Although two-stroke fuel engines have many advantages, they are short in terms of exhaust emissions. As we all know, two-stroke fuel engines are equipped with an intake channel and an exhaust channel. The intake channel is connected to the carburetor, and the exhaust channel is connected to the muffler. During the scavenging stroke, more fuel mixture will escape directly without combustion and be discharged from the exhaust channel. When the scavenging is insufficient, the exhaust gas remaining in the two-stroke fuel engine will affect the quality of the mixed fuel gas, increase exhaust pollutants, and be discharged into the atmosphere, causing fuel waste and environmental pollution. In order to protect human health and the natural environment, relevant exhaust emission standards have been established at home and abroad, such as China's National II emission standards, Europe's Euro II emission standards, and the United States' EPA3 emission standards.

[0003] At present, the domestic method of meeting emission standards is to add honeycomb catalysts or wire mesh catalysts coated with precious metals in the exhaust channel of the muffler. When the exhaust pollutants pass through the catalyst surface in the exhaust channel of the muffler, a violent combustion reaction occurs, burning the harmful components in the exhaust gas, thereby meeting the emission standards. However, the combustion reaction inside the catalytic muffler will generate a large amount of heat, forming a high temperature field of nearly 1,000 degrees Celsius, which requires that the material of the muffler must meet high temperature resistance performance; at the same time, in order to prevent the heat radiation of the muffler from scalding the surrounding plastic coverings, a complex insulation structure must be designed inside and around the muffler to reduce the surface temperature of the muffler and reduce the heat radiation on the surface of the muffler. During use, catalytic mufflers are often partially covered by solid pollutants, blocked, and the precious metal coating falls off, resulting in a weakening or failure of the catalyst performance, which ultimately leads to excessive exhaust emissions.

[0004] Therefore, in view of this, the inventor proposes a two-stroke fuel engine to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a two-stroke fuel engine to solve the problem of high tail gas emission pollution caused by the existing two-stroke fuel engine during the scavenging process.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A two-stroke fuel engine, comprising a body with an air intake passage and an air outlet passage, a chamber connected to the air intake passage and the air outlet passage being formed in the body, a crankshaft unit and a first piston connected to the crankshaft unit being arranged in the body, the crankshaft unit being capable of driving the first piston to perform periodic reciprocating motion, the first piston dividing the chamber into a first chamber and a second chamber, and a scavenging passage being arranged between the first chamber and the second chamber;

[0008] The machine body is provided with a compression structure, which includes a pump body and a cam unit connected to the pump body, and the cam unit is arranged in the pump body;

[0009] A first pump body cavity is formed in the pump body, and the cam unit can drive the volume of the first pump body cavity to increase or decrease;

[0010] It also includes a main oil circuit balancing channel and a main fuel mixture delivery channel, one end of the main oil circuit balancing channel and the main fuel mixture delivery channel are both connected to the first pump body cavity, the other end of the main fuel mixture delivery channel is connected to the first chamber, and the other end of the main oil circuit balancing channel is used to communicate with the intake channel and / or the second chamber.

[0011] According to the above technical scheme, the present invention adds a compression structure to the engine body, wherein the cam unit drives the volume of the first pump body cavity in the pump body to periodically increase or decrease by converting its rotational motion into linear motion. When the two-stroke fuel engine has completed scavenging and closed the air outlet channel, the volume of the first pump body cavity is reduced, and the fuel mixture therein is compressed and pushed to the main fuel mixture delivery channel. The main fuel mixture delivery channel directly delivers the high-pressure, high-concentration fuel mixture into the first chamber. Since the two-stroke fuel engine has completed scavenging and closed the air outlet channel at this time, this part of the fuel mixture will no longer escape, thereby reducing the amount of fuel escaping through the scavenging channel.

[0012] Furthermore, a carburetor connected to the air intake passage is provided on one side of the body, a main oil circuit connecting passage is connected to the carburetor, and an end of the main oil circuit connecting passage is connected to the first pump body cavity;

[0013] One-way valves are provided on the main oil circuit balancing channel, the main fuel-fuel mixture delivery channel and the main oil circuit connecting channel.

[0014] According to the above technical solution, the carburetor is responsible for mixing the fuel and air to form a high-concentration combustible mixture, which enters the first pump body cavity through the main oil circuit channel to provide the engine with most of the fuel required for combustion; when the cam unit drives the first pump body cavity to reduce its volume, the fuel mixture therein is compressed and sent to the first chamber through the main fuel mixture delivery channel. The one-way valve on the main oil circuit balance channel: prevents the fuel mixture from flowing back to the second chamber or the intake channel under pressure, ensuring the one-way flow of the oil circuit; the one-way valve on the main fuel mixture delivery channel is to ensure that the fuel mixture can only flow from the first pump body cavity to the first chamber to prevent backflow; the one-way valve on the main oil circuit connection channel is to control the one-way flow of fuel from the carburetor to the first pump body cavity to prevent fuel from flowing back to the carburetor.

[0015] Furthermore, the compression structure includes a rotating shaft, a crankshaft and a connecting rod, the rotating shaft is rotatably connected to the body, the crankshaft is coaxially mounted on the rotating shaft, one end of the connecting rod is eccentrically connected to the crankshaft, and the other end of the connecting rod is connected to the first piston.

[0016] According to the above technical solution, during the compression stroke when the first piston moves upward, the gas in the first chamber is compressed, and the pressure and temperature both increase. When the first piston reaches near the top dead center, the spark plug ignites the compressed mixture to generate high-pressure combustion gas. The burned gas pushes the first piston to move downward, and transmits mechanical energy to external equipment through the connecting rod and the crankshaft. During the exhaust stroke, the first piston moves downward, sweeps out the combustion products through the lean mixture in the scavenging passage, and discharges them into the muffler through the outlet passage, and the operation is repeated.

[0017] Furthermore, the cam unit includes a cam, a tappet slidably connected in the pump body, and a second piston connected to the tappet. The cam is coaxially fixed on the rotating shaft, and the cam is used to drive the second piston to reciprocate.

[0018] According to the above technical solution, the cam is coaxially fixed on the rotating shaft, that is, the cam and the rotating shaft share the same rotation axis, and when the rotating shaft rotates, the cam will also rotate accordingly; the tappet is slidably connected in the pump body and can perform reciprocating linear motion in the pump body. One end of the tappet is in contact with the cam, and the other end is connected to the second piston. When the cam rotates, its contour will periodically contact and push the tappet. Since the tappet is connected to the second piston, the reciprocating linear motion of the tappet will drive the second piston to perform periodic reciprocating motion in the pump body. The movement of the second piston will change the volume of the first pump body cavity, thereby realizing the compression and delivery of the fuel mixture; when the second piston moves upward, the volume of the first pump body cavity decreases, and the fuel mixture is compressed and sent into the first chamber through the main fuel mixture delivery channel to provide fuel for the combustion process. At the same time, the carburetor continuously supplies new fuel mixture to the main oil circuit connecting channel. The fuel mixture enters the pump body cavity through the one-way valve to prepare for the next compression. The one-way valve ensures the one-way flow of the fuel mixture; the one-way valves on the main fuel mixture delivery channel and the main oil circuit connecting channel are used to prevent the backflow of the fuel mixture.

[0019] Furthermore, a second pump body cavity is opened in the pump body, and the second piston is sealingly and slidably connected between the first pump body cavity and the second pump body cavity.

[0020] Further, the oil circuit balance main channel includes a first oil circuit channel, a second oil circuit channel and a third oil circuit channel, one end of the first oil circuit channel is connected to a three-way channel, and one end of the second oil circuit channel and the third oil circuit channel is connected to the first oil circuit channel through the three-way channel;

[0021] The other end of the second oil passage is connected to the first pump body cavity;

[0022] The other end of the third oil passage is communicated with the second pump body cavity.

[0023] According to the above technical scheme, when the second piston moves downward, the fuel mixture enters the first oil channel from the second chamber or the intake channel, and then flows to the second oil channel and the third oil channel respectively through the three-way channel. The second oil channel supplies the fuel mixture to the first pump body cavity, and the fuel mixture remaining in the second pump body cavity is supplied to the second oil channel through the three-way channel and finally enters the first pump body cavity; when the second piston moves upward, the volume of the first pump body cavity decreases, and under the action of the second piston, the fuel mixture in the first pump body cavity is transported to the first chamber for combustion; at the same time, the volume of the second pump body cavity increases, and the combustible mixture in the second chamber or the intake channel enters the second pump body cavity through the first oil channel and the third oil channel. At this time, in addition to balancing the air pressure to achieve balanced flow of the fuel mixing chamber in the pump body, the mixture can also lubricate the cam unit to improve the overall life of the device.

[0024] Furthermore, a high-speed fuel flow channel, an idle fuel flow channel and an intake flow channel are provided in the carburetor;

[0025] The high-speed fuel flow channel is connected to the main fuel circuit connecting channel;

[0026] The idle fuel flow passage is connected to the intake flow passage;

[0027] A rotary control valve is rotatably connected in the high-speed fuel flow passage, and the rotary control valve is used to control the opening and closing of the high-speed fuel flow passage; the high-speed fuel flow passage is connected to the idle fuel flow passage through the rotary control valve.

[0028] According to the above technical solution, the high-speed fuel flow channel is connected to the main oil circuit connecting channel, which is used to provide sufficient fuel mixture when the two-stroke fuel engine is running at high speed. The idle fuel flow channel is connected to the intake flow channel, which is used to provide an appropriate amount of fuel mixture when the two-stroke fuel engine is running at idle speed. The rotary control valve is rotatably connected in the high-speed fuel flow channel to control the opening and closing of the high-speed fuel flow channel; when the two-stroke fuel engine needs to run at high speed, the rotary control valve opens the high-speed fuel flow channel, so that the fuel can flow smoothly into the carburetor main oil circuit connecting channel and mix with the air.

[0029] When the two-stroke fuel engine is in a medium or low speed operation state, the rotary control valve closes or partially closes the high-speed fuel flow channel, and at the same time, the fuel in the idle fuel flow channel is mixed with the air in the intake flow channel. In the carburetor, the fuel is mixed with the air in the intake flow channel through the high-speed fuel flow channel or the idle fuel flow channel to form a combustible mixture. The ratio of the fuel mixture is determined by the opening and closing degree of the rotary control valve, the fuel flow rate and the intake flow rate. By adjusting the opening and closing degree of the rotary control valve, the fuel supply can be accurately adjusted to meet the mixture requirements of the two-stroke fuel engine under different working conditions.

[0030] Further, a throttle adjusting rod and a throttle fixed on the throttle adjusting rod are rotatably connected in the intake flow passage, the throttle is used to open or close the intake flow passage, one end of the throttle adjusting rod extends out of the carburetor and is connected to a throttle linkage plate, a first arc surface is provided on the throttle linkage plate, and a first convex portion is formed on the throttle linkage plate;

[0031] A control valve adjusting rod is connected to the rotary control valve, and the control valve adjusting rod extends out of the carburetor and is connected to a control valve linkage plate, a second protrusion is formed on the control valve linkage plate, and a first torsion spring is sleeved on the control valve adjusting rod, and the first torsion spring has a tendency to drive the second protrusion to abut against the first arc surface.

[0032] Furthermore, a choke adjusting rod and a choke fixed on the choke adjusting rod are rotatably connected in the intake air passage, the choke valve is used to open or close the intake air passage, one end of the choke adjusting rod extends out of the carburetor and is connected to a choke linkage plate, a second arc surface is provided on the choke linkage plate, a second torsion spring is sleeved on the choke adjusting rod, and the second torsion spring has a tendency to drive the second arc surface to abut against the first protrusion.

[0033] According to the above technical solution, the choke is operated by a choke adjusting rod, which is rotatably connected in the intake flow passage of the carburetor, and the choke is fixed on the choke adjusting rod. The main function of the choke is to open or close the intake flow passage, and the choke linkage plate controls the rotation angle of the choke, thereby adjusting the amount of air entering the intake passage in the carburetor; the throttle is a component that controls the mixed gas from the carburetor into the cylinder of the two-stroke fuel engine, and the choke controls the amount of air entering the carburetor. The throttle is combined with the choke linkage plate and the control valve linkage plate. Through the linkage design, the opening of the throttle and the choke can be adjusted in real time according to the operating state of the two-stroke fuel engine, thereby optimizing the concentration of the mixed gas and the intake volume, which helps to improve the starting performance, operating stability and fuel economy of the two-stroke fuel engine. Due to the interaction and restriction between the linkage components, it can also prevent misoperation or excessive wear to a certain extent, so that the carburetor can better adapt to various complex environments and improve the overall performance and reliability of the vehicle.

[0034] Furthermore, a high-speed fuel outlet and an idle fuel outlet are provided in the carburetor, the high-speed fuel outlet is connected to the high-speed fuel flow channel, and the idle fuel outlet is connected to the idle fuel flow channel;

[0035] A high-speed fuel adjusting screw and an idle fuel adjusting screw are provided on one side of the carburetor. The high-speed fuel adjusting screw is used to adjust the opening and closing degree of the high-speed fuel outlet, and the idle fuel adjusting screw is used to adjust the opening and closing degree of the idle fuel outlet.

[0036] According to the above technical solution, the high-speed fuel outlet and the idle fuel outlet are respectively connected to the high-speed fuel flow channel and the idle fuel flow channel, and the opening and closing degrees of the two outlets can be adjusted by the high-speed fuel adjusting screw and the idle fuel adjusting screw. When the two-stroke fuel engine needs to run at high speed, more fuel supply is required, and the opening and closing degree of the high-speed fuel outlet can be adjusted by rotating the high-speed fuel adjusting screw; when the two-stroke fuel engine is idling, the fuel demand is low. At this time, the idle fuel adjusting screw is used to adjust the opening and closing degree of the idle fuel outlet, so as to accurately control the fuel supply amount at idle, which helps to maintain the stable operation of the two-stroke fuel engine in the idle state. Accurate fuel supply control helps to maintain the stable operation of the two-stroke fuel engine under different working conditions, especially in the idle state. By adjusting the opening and closing degree of the idle fuel outlet, it can be ensured that the two-stroke fuel engine will not stall or jitter due to insufficient or excessive fuel supply.

[0037] Beneficial effects of the present invention:

[0038] 1. The present invention designs a compression structure and utilizes a rotating shaft to drive the rotational motion of the cam unit to be converted into linear motion, thereby driving the volume of the first pump body cavity in the pump body to increase or decrease periodically. After the body is scavenged and the air outlet channel is closed, the fuel mixture in the first pump body cavity is compressed and pushed to the main fuel mixture delivery channel, and directly sent into the first chamber for combustion; the problem of part of the combustible mixture overflowing from the air outlet channel with the exhaust gas without being burned is avoided, and the amount of fuel escaping is significantly reduced, thereby improving the economy and utilization rate of the fuel.

[0039] 2. The present invention optimizes the carburetor, and realizes precise control of the fuel supply by linking the throttle, choke and rotary control valve. The rotary control valve accurately adjusts the opening and closing degree of the high-speed fuel flow channel and the idle fuel flow channel. This precise control enables the concentration of the mixed gas to be adjusted according to the actual needs of the two-stroke fuel engine, thereby improving the efficiency and stability of combustion; at the same time, the optimization of the internal structure of the carburetor also promotes the full mixing of fuel and air, further improving the combustion efficiency.

[0040] Other advantages, objectives and features of the present application will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present application. The objectives and other advantages of the present application can be achieved and obtained through the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of a two-stroke fuel engine body in the prior art;

[0042] Figure 2It is a schematic diagram of the overall structure of the two-stroke fuel engine of the present invention in one direction;

[0043] Figure 3 It is a schematic diagram of the overall structure of the two-stroke fuel engine of the present invention from another direction;

[0044] Figure 4 It is a half-section structural schematic diagram of a two-stroke fuel engine of the present invention;

[0045] Figure 5 A partial cross-sectional structural schematic diagram of a two-stroke fuel engine of the present invention;

[0046] Figure 6 Another partial cross-sectional structural schematic diagram of the two-stroke fuel engine of the present invention;

[0047] Figure 7 The two-stroke fuel engine of the present invention Figure 4 Schematic diagram of the structure of part A;

[0048] Figure 8 The two-stroke fuel engine of the present invention Figure 6 Schematic diagram of the structure of part B;

[0049] Fig. 9 It is a schematic diagram of the overall structure of the linkage between the throttle, the choke and the rotary control valve in the carburetor of the two-stroke fuel engine of the present invention;

[0050] Fig.10 The present invention is a schematic diagram of the disassembled structure of the linkage of the throttle, the choke and the rotary control valve in the carburetor of the two-stroke fuel engine.

[0051] Among them, the engine body 1, the high-speed fuel outlet 101, the idle fuel outlet 102, the high-speed fuel adjustment screw 103, the idle fuel adjustment screw 104, the intake channel 11, the outlet channel 12, the chamber 13, the first chamber 131, the second chamber 132, the crankshaft unit 14, the shaft 141, the crankshaft 142, the connecting rod 143, the first piston 15, the scavenging channel 16, the compression structure 2, the pump body 21, the first pump body cavity 211, the second pump body cavity 212, the cam unit 22, the cam 221, the tappet 222, the second piston 223, the oil circuit balance total channel 23, the first oil circuit channel 231, the second oil circuit channel 232, the third oil circuit channel 233, the first oil circuit channel 231, the second oil circuit channel 232, the third oil circuit channel 233, the first oil circuit channel 232, the second oil circuit channel 233, the first oil circuit channel 231, the second oil circuit channel 232, the third ... Road channel 233, three-way channel 234, main fuel mixture delivery channel 24, carburetor 3, high-speed fuel flow channel 31, idle fuel flow channel 32, intake flow channel 33, rotary control valve 34, throttle adjustment rod 351, throttle 352, throttle linkage plate 353, first arc surface 3531, first protrusion 354, control valve adjustment rod 361, control valve linkage plate 362, second protrusion 363, first torsion spring 364, choke adjustment rod 371, choke 372, choke linkage plate 373, second arc surface 3731, second torsion spring 374, intake channel 4, main oil circuit connecting channel 5, muffler 6. DETAILED DESCRIPTION

[0052] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0054] Existing technologies such as Figure 1 As shown, the machine body 1 includes an air inlet channel 11 and an air outlet channel 12. Figure 1The vertical height of the intake channel 11 is located below the outlet channel 12, a chamber 13 connected to the intake channel 11 and the outlet channel 12 is opened in the engine body 1, a crankshaft unit 14 and a first piston 15 connected to the crankshaft unit 14 are arranged in the engine body 1, the crankshaft unit 14 can drive the first piston 15 to periodically reciprocate up and down, the first piston 15 is located in the chamber 13 to divide the chamber 13 into a first chamber 131 and a second chamber 132, the first chamber 131 is located above the second chamber 132, a scavenging channel 16 is arranged between the first chamber 131 and the second chamber 132, when the first piston 15 moves down to a certain preset position, the combustible mixture in the second chamber 132 can enter the first chamber 131 through the scavenging channel 16, and a one-way valve (not shown) is arranged at the position of the intake channel 11 and the outlet channel 12 to prevent the combustible mixture from flowing back. Working principle: During operation, the first piston 15 is driven by the crankshaft unit 14 to periodically reciprocate up and down, thereby changing the volume of the first chamber 131 and the second chamber 132. When the first piston 15 moves upward, the outlet passage 12 is closed, the volume of the first chamber 131 decreases, and high pressure is generated. At this time, the spark plug above the engine body 1 ignites the compressed combustible mixture in the first chamber 131, and combustion produces work; at this time, the volume of the second chamber 132 increases during the upward movement of the first piston 15, forming a low-pressure area, and the second chamber 132 takes in air, and the mixed gas enters the second chamber 132 through the intake passage 11; when the crankshaft unit 14 drives the first piston 15 to move downward, the volume of the first chamber 131 increases, and the volume of the second chamber 132 decreases. At this time The first piston 15 moves downward and no longer blocks the scavenging passage 16, and the scavenging passage 16 is opened. Due to the presence of the one-way valve, the fuel mixture in the second chamber 132 enters the first chamber 131, and the exhaust gas after combustion in the first chamber 131 is discharged through the exhaust passage 12. However, since the exhaust passage 12 and the scavenging passage 16 in the current body 1 overlap in time and the scavenging passage 16 are connected in space, part of the combustible mixture overflows from the exhaust passage 12 along with the exhaust gas without being burned, causing part of the unburned fuel mixture to escape with the exhaust gas, resulting in exhaust pollution.

[0055] This embodiment provides a two-stroke fuel engine. Figures 2 to 10 As shown, a compression structure 2 is provided on the body 1, and the compression structure 2 can be installed at different positions on the body 1, such as the side surface, top surface, etc. of the body 1, which is not limited in this embodiment;

[0056] like Figure 5 and Figure 6 As shown, the compression structure 2 includes a pump body 21 and a cam unit 22 connected to the pump body 21, and the cam unit 22 is arranged in the pump body 21; specifically, as shown in Figure 8As shown, a first pump body cavity 211 is defined in the pump body 21 , and the cam unit 22 can drive the volume of the first pump body cavity 211 to increase or decrease.

[0057] It also includes a total oil circuit balancing channel 23 and a main fuel mixture delivery channel 24. One end of the total oil circuit balancing channel 23 and the main fuel mixture delivery channel 24 are both connected to the first pump body cavity 211, and the other end of the main fuel mixture delivery channel 24 is connected to the first chamber 131. The other end of the total oil circuit balancing channel 23 is used to communicate with the intake channel 11 and / or the second chamber 132.

[0058] As an exemplary embodiment, Figure 2 and Figure 6 As shown, the other end of the oil circuit balance main channel 23 is used to communicate with the intake channel 11.

[0059] In this embodiment, a compression structure 2 is added to the engine body 1, in which the cam unit 22 converts its rotational motion into linear motion to drive the volume of the first pump body cavity 211 in the pump body 21 to periodically increase or decrease. When the engine body 1 is scavenged and the outlet channel 12 is closed, the volume of the first pump body cavity 211 is reduced, and the fuel mixture therein is compressed and pushed to the main fuel mixture delivery channel 24. The main fuel mixture delivery channel 24 delivers the fuel mixture directly into the first chamber 131. Since the engine body 1 is scavenged and the outlet channel 12 is closed at this time, this part of the fuel mixture will no longer escape, thereby reducing the amount of fuel escaping through the scavenging channel 16.

[0060] like Figure 3 As shown, a muffler 6 connected to the air outlet passage 12 is provided on the right side of the body 1, and a carburetor 3 connected to the air inlet passage 11 is provided on the left side of the body 1. Figure 2 As shown, an air intake channel 4 is provided between the carburetor 3 and the air intake channel 11 , a main oil circuit connecting channel 5 is connected to the carburetor 3 , and one end of the main oil circuit connecting channel 5 is communicated with the first pump body cavity 211 .

[0061] One-way valves are provided on the main oil circuit balancing channel 23, the main fuel mixture delivery channel 24 and the main oil circuit connecting channel 5. The one-way valve on the main oil circuit balancing channel 23 is to prevent the fuel mixture from flowing back to the second chamber 132 or the intake channel 11 under pressure, ensuring the one-way flow of the oil circuit; the one-way valve on the main fuel mixture delivery channel 24 is to ensure that the fuel mixture can only flow from the first pump body cavity 211 to the first chamber 131 to prevent backflow; the one-way valve on the main oil circuit connecting channel 5 is to control the one-way flow of the fuel mixture from the carburetor 3 to the first pump body cavity 211 to prevent the fuel mixture from flowing back to the carburetor 3.

[0062] In one implementation, the one-way valve in this embodiment is a one-way diaphragm valve.

[0063] In this embodiment, the carburetor 3 is responsible for mixing high-concentration fuel with air to form a combustible mixture, and the combustible mixture enters the intake passage 11 through the intake passage 4 to provide the engine body 1 with the fuel required for combustion; when the volume of the first pump body cavity 211 is reduced, the fuel mixture therein is compressed and simultaneously delivered to the first chamber 131 through the main fuel mixture delivery passage 24. In this process, compared with the prior art, the present embodiment reduces the amount of combustible mixture entering the first chamber 131 from the second chamber 132, thereby reducing the fuel mixture escaping through the scavenging passage 16, avoiding the combustible mixture from overflowing from the exhaust passage 12 without being burned, significantly reducing the escape amount of the fuel mixture, thereby improving the economy and utilization rate of the fuel.

[0064] As a preferred embodiment, Figure 4 and Figure 5 As shown, the compression structure 2 includes a rotating shaft 141, a crankshaft 142 and a connecting rod 143. The rotating shaft 141 is rotatably connected to the body 1, the crankshaft 142 is coaxially connected to the rotating shaft 141, one end of the connecting rod 143 is eccentrically connected to the crankshaft 142, and the other end of the connecting rod 143 (i.e., the top end of the connecting rod 143) is connected to the first piston 15.

[0065] In this embodiment, during the compression stroke when the first piston 15 moves upward, the gas in the first chamber 131 is compressed, and the pressure and temperature both increase. When the first piston 15 reaches near the top dead center, the spark plug ignites the compressed fuel mixture, burns the gas and explodes; the first piston 15 moves downward, and transmits mechanical energy to external equipment through the connecting rod 143 and the crankshaft 142.

[0066] like Figure 8 As shown, a second pump body cavity 212 is provided in the pump body 21, and a second piston 223 is sealingly and slidably connected between the first pump body cavity 211 and the second pump body cavity 212; as a preferred embodiment, Figure 5 and Figure 6 As shown, the cam unit 22 includes a cam 221, a tappet 222 slidably connected to the pump body 21, and a second piston 223 connected to the tappet 222. The cam 221 is coaxially fixed on the rotating shaft 141. When the rotating shaft 141 rotates, the cam 221 is driven to rotate synchronously. The cam 221 is used to drive the second piston 223 to move reciprocatingly up and down.

[0067] In this embodiment, the cam 221 is coaxially fixed on the rotating shaft 141, that is, the cam 221 and the rotating shaft 141 share the same rotating axis 141 line. When the rotating shaft 141 rotates, the cam 221 will also rotate accordingly; one end of the tappet 222 is in contact with the cam 221, and the other end is connected to the second piston 223. When the cam 221 rotates, its contour will periodically contact and push the tappet 222. Since the tappet 222 is connected to the second piston 223, the reciprocating linear motion of the tappet 222 will drive the second piston 223 to perform periodic reciprocating motion in the pump body 21. The movement of the second piston 223 will change the volume of the first pump body cavity 211 and the second pump body cavity 212, thereby realizing the storage and transportation of the fuel mixture; Figure 6 As shown, when the second piston 223 moves upward, the volume of the first pump body cavity 211 decreases, and the fuel mixture is compressed and sent to the first chamber 131 through the main fuel mixture delivery channel 24 to provide fuel for the combustion process. At the same time, the carburetor 3 continues to provide new fuel mixture to the main oil circuit connection channel 5. These fuel mixtures enter the first pump body cavity 211 through the one-way valve to prepare for the next compression and delivery. The one-way valve ensures the one-way flow of the fuel mixture; when the second piston 223 moves upward, the second piston 223 has a compression action when delivering the fuel mixture in the first pump body cavity 211 to the first chamber 131. This action can increase the density of the fuel mixture, so that the fuel entering the first chamber 131 burns more fully.

[0068] As a preferred embodiment, the oil circuit balance main channel 23 includes a first oil circuit channel 231, a second oil circuit channel 232 and a third oil circuit channel 233, one end of the first oil circuit channel 231 is connected to a three-way channel 234, and one end of the second oil circuit channel 232 and the third oil circuit channel 233 are connected to the first oil circuit channel 231 through the three-way channel 234; wherein, the other end of the second oil circuit channel 232 is connected to the first pump body cavity 211, and a one-way valve is provided at the connection between the second oil circuit channel 232 and the first pump body cavity 211, so that the fuel mixture can only enter the first pump body cavity 211 from the second oil circuit channel 232 in one direction; the other end of the third oil circuit channel 233 is connected to the second pump body cavity 212.

[0069] In this embodiment, when the second piston 223 moves downward, the fuel mixture enters the first oil passage 231 from the intake passage 11, and then flows to the second oil passage 232 and the third oil passage 233 respectively through the three-way passage 234. The second oil passage 232 supplies the fuel mixture to the first pump body cavity 211. As the second piston 223 moves downward, the fuel mixture remaining in the second pump body cavity 212 is supplied to the second oil passage 232 through the three-way passage 234 and finally enters the first pump body cavity 211. When the second piston 223 moves downward, the fuel mixture remaining in the second pump body cavity 212 is supplied to the second oil passage 232 through the three-way passage 234 and finally enters the first pump body cavity 211. When the plug 223 moves upward, the volume of the first pump body cavity 211 decreases, and the fuel mixture in the first pump body cavity 211 is transported to the first chamber 131 for combustion; at the same time, the volume of the second pump body cavity 212 increases, and the combustible mixture in the intake channel 11 enters the second pump body cavity 212 through the first oil channel 231 and the third oil channel 233. At this time, in addition to balancing the air pressure to achieve balanced flow of the fuel mixture in the pump body 21, the fuel mixture can also lubricate the cam unit 22, thereby increasing the overall life of the device.

[0070] As a preferred embodiment, Figure 7 As shown, a high-speed fuel flow channel 31, an idle fuel flow channel 32 and an intake flow channel 33 are provided in the carburetor 3; wherein the high-speed fuel flow channel 31 is connected to the main oil circuit connecting channel 5, the idle fuel flow channel 32 is connected to the intake flow channel 33, and a rotary control valve 34 is rotatably connected in the high-speed fuel flow channel 31, and the rotary control valve 34 is used to control the opening and closing of the high-speed fuel flow channel 31; the high-speed fuel flow channel 31 is connected to the idle fuel flow channel 32 through the rotary control valve 34. The high-speed fuel flow channel 31 is connected to the main oil circuit connecting channel 5, and is used to provide sufficient fuel when the two-stroke fuel engine is running at high speed. The idle fuel flow channel 32 is connected to the intake flow channel 33, and is used to provide an appropriate amount of fuel when the two-stroke fuel engine is running at idle speed. The rotary control valve 34 is rotatably connected in the high-speed fuel flow channel 31 to control the opening and closing of the high-speed fuel flow channel 31; when the two-stroke fuel engine needs to run at high speed, the rotary control valve 34 opens the high-speed fuel flow channel 31. Due to the existence of the main oil circuit connecting channel 5, the flow through the intake flow channel 33 is correspondingly reduced, and the concentration of the fuel mixture entering the second chamber 132 through the intake channel 4 via the intake channel 11 is greatly reduced. Therefore, the amount of fuel escaping through the scavenging channel 16 is also greatly reduced. Most of the fuel mixture required by the body 1 mainly enters the compression structure 2 through the high-speed fuel flow channel 31 and the main oil circuit connecting channel 5, and then is pressed into the first chamber 131 for combustion, thereby achieving the purpose of energy saving and emission reduction.

[0071] As a preferred embodiment, a throttle adjusting rod 351 and a throttle 352 fixed on the throttle adjusting rod 351 are rotatably connected in the intake flow passage 33. The throttle 352 is used to open or close the intake flow passage 33. One end of the throttle adjusting rod 351 extends out of the carburetor 3 and is connected to a throttle linkage plate 353. The throttle linkage plate 353 is provided with a first arc surface 3531, and a first protrusion 354 is formed on the throttle linkage plate 353. A control valve adjusting rod 361 is connected to the rotary control valve 34. The control valve adjusting rod 361 extends out of the carburetor 3 and is connected to a control valve linkage plate 362. A second protrusion 363 is formed on the control valve linkage plate 362. A first torsion spring 364 is sleeved on the control valve adjusting rod 361. The first torsion spring 364 has a tendency to drive the second protrusion 363 to abut against the first arc surface 3531.

[0072] According to the above technical solution, the throttle 352 is fixed on the throttle adjusting rod 351 and can be rotated in the intake flow channel 33 to open or close the intake flow channel 33. One end of the throttle adjusting rod 351 extends out of the carburetor 3 and is connected to the throttle linkage plate 353. In this way, the opening of the throttle 352 can be indirectly controlled by operating the throttle linkage plate 353. When the throttle linkage plate 353 rotates, the first arc surface 3531 pushes or pulls the second protrusion 363, thereby controlling the air intake duct 33. The valve adjustment rod 361 drives the rotary control valve 34 to rotate; when the throttle valve 352 is opened, the air flow in the intake flow channel 33 increases, and at the same time, due to the interaction between the first arc surface 3531 and the second protrusion 363, the rotary control valve 34 will also rotate accordingly, thereby adjusting the opening and closing degree of the high-speed fuel flow channel 31. In this way, as the air flow increases, the fuel supply will also increase accordingly to maintain the appropriate ratio of the mixed gas. When the throttle valve 352 is closed, the air flow in the intake flow channel 33 decreases. Similarly, the rotary control valve 34 will also rotate accordingly to reduce the fuel supply. Through the linkage mechanism of the throttle valve 352 and the control valve linkage plate 362, accurate control of the air and fuel flow can be achieved, so that the ratio of the mixed gas can be adjusted according to the actual needs of the two-stroke fuel engine, thereby improving the combustion efficiency and the performance of the two-stroke fuel engine. The use of structural linkage helps to reduce the imbalance of the mixed gas ratio caused by improper operation or system failure, thereby enhancing the stability of the system.

[0073] Furthermore, if Fig. 9 and Fig.10As shown, a choke adjusting rod 371 and a choke 372 fixed on the choke adjusting rod 371 are rotatably connected in the intake air passage 33. The choke 372 is used to open or close the intake air passage 33. One end of the choke 372 adjusting rod extends out of the carburetor 3 and is connected to a choke linkage plate 373. The choke linkage plate 373 is provided with a second arc surface 3731. The choke 372 adjusting rod is sleeved with a second torsion spring 374. The second torsion spring 374 has a tendency to drive the second arc surface 3731 to abut against the first protrusion 354.

[0074] According to the above technical scheme, the choke 372 is operated by the choke adjusting rod 371. The main function of the choke 372 is to open or close the intake flow channel 33. The choke linkage plate 373 controls the rotation angle of the choke 372, thereby adjusting the amount of air entering the intake channel 11 in the carburetor 3; the throttle 352 is a component that controls the mixture to enter the cylinder of the two-stroke fuel engine from the carburetor 3, and the choke 372 controls the amount of air entering the carburetor 3. The throttle 352 is combined with the choke linkage plate 373 and the control valve linkage plate 362. The three can be linked through a design to adjust the opening of the throttle 352 and the choke 372 in real time according to the operating state of the two-stroke fuel engine, thereby optimizing the concentration of the mixture and the intake volume, which helps to improve the starting performance, operating stability and fuel economy of the two-stroke fuel engine.

[0075] When the two-stroke fuel engine is in a medium or low speed operation state, the rotary control valve 34 closes or partially closes the high-speed fuel flow channel 31, and allows the fuel in the idle fuel flow channel 32 to mix with the air in the intake flow channel 33. In the carburetor 3, the fuel mixes with the air in the intake flow channel 33 through the idle fuel flow channel 32 to form a combustible mixture. Figure 8 As shown, when the engine 1 is idling, the throttle 352 closes most of the intake air passage 33 and maintains an opening within a certain range to maintain stable operation of the engine 1; specifically, this opening is sufficient to ensure that the engine 1 obtains the necessary intake air volume in the idling state.

[0076] The ratio of the fuel-gas mixture is determined by the opening and closing degree of the rotary control valve 34, the fuel flow rate and the intake air flow rate. By adjusting the opening and closing degree of the rotary control valve 34, the fuel supply can be accurately adjusted to meet the needs of the two-stroke fuel engine for the mixed gas under different working conditions. For example, when the two-stroke fuel engine is cold started, due to the low temperature of the two-stroke fuel engine, the fuel evaporates poorly, and a thicker mixed gas is required to start smoothly. As the engine temperature gradually increases, the rotary control valve 34 can gradually increase the fuel supply of the high-speed fuel flow channel 31 and reduce the fuel supply of the idle fuel flow channel 32, so that the mixed gas gradually becomes thinner to meet the needs of normal operation of the engine.

[0077] As a preferred embodiment, Figure 3 and Figure 7 As shown, the carburetor 3 is provided with a high-speed fuel outlet 101 and an idle fuel outlet 102, the high-speed fuel outlet 101 is connected to the high-speed fuel flow channel 31, and the idle fuel outlet 102 is connected to the idle fuel flow channel 32;

[0078] One side of the carburetor 3 ( Figure 3 A high-speed fuel adjusting screw 103 and an idle fuel adjusting screw 104 are provided on the front side of the fuel tank. The high-speed fuel adjusting screw 103 is used to adjust the opening and closing degree of the high-speed fuel outlet 101, and the idle fuel adjusting screw 104 is used to adjust the opening and closing degree of the idle fuel outlet 102.

[0079] According to the above technical solution, the high-speed fuel outlet 101 and the idle fuel outlet 102 are respectively connected to the high-speed fuel flow channel 31 and the idle fuel flow channel 32, and the opening and closing degrees of the two outlets can be adjusted by the high-speed fuel adjusting screw 103 and the idle fuel adjusting screw 104. When the two-stroke fuel engine needs to run at high speed, more fuel supply is required, and the opening and closing degree of the high-speed fuel outlet 101 can be adjusted by rotating the high-speed fuel adjusting screw 103; when the two-stroke fuel engine is idling, the fuel demand is low. At this time, the idle fuel adjusting screw 104 is used to adjust the opening and closing degree of the idle fuel outlet 102, so as to accurately control the fuel supply amount at idle, which helps to maintain the stable operation of the two-stroke fuel engine in the idle state. Accurate fuel supply control helps to maintain the stable operation of the two-stroke fuel engine under different working conditions. In the idle state, by adjusting the opening and closing degree of the idle fuel outlet 102, it can be ensured that the two-stroke fuel engine will not stall or shake due to insufficient or excessive fuel supply.

[0080] In addition, in a possible implementation, in order to further improve the uniformity of fuel mixing and combustion efficiency, a venturi channel or a throttle plate or other structures may be provided in the carburetor 3 to increase the mixing time and mixing intensity of fuel and air. These structures can promote the atomization and evaporation of fuel by changing the flow speed and direction of fuel and air, thereby improving the quality of the mixed gas and combustion efficiency.

[0081] As a preferred embodiment, the improvement of the carburetor 3 not only improves the starting performance and operating stability of the two-stroke fuel engine, but also achieves precise control of the concentration of the mixed gas by accurately adjusting the fuel supply, thereby meeting the requirements of the two-stroke fuel engine for the mixed gas under different working conditions. At the same time, by optimizing the internal structural design of the carburetor 3, the mixing effect of the fuel and the air is improved, further improving the combustion efficiency and performance of the two-stroke fuel engine.

[0082] In addition, it is worth noting that in practical applications, the design and optimization of a two-stroke fuel engine is a complex process that requires consideration of the combined effects of multiple factors. In addition to the above-mentioned carburetor 3 structure and fuel mixture control, attention can also be paid to the design and optimization of the engine's intake system, exhaust system, ignition system, etc.; by comprehensively considering these factors, the overall performance of the two-stroke fuel engine can be improved and energy consumption can be reduced.

[0083] Finally, it should be pointed out that although the above embodiments provide preferred structures of the compression structure 2 and the carburetor 3, it does not mean that these structures are the only or optimal ones. In practical applications, the structure and parameters of the two-stroke fuel engine can be further adjusted and optimized according to specific needs and conditions to achieve better performance and effects.

[0084] In summary, the two-stroke fuel engine structure provided by the present invention, by designing the compression structure 2, uses the main fuel mixture delivery channel 24 to directly deliver the fuel mixture into the first chamber 131, thereby preventing this part of the fuel mixture from escaping, thereby reducing the amount of fuel escaping through the scavenging channel 16; optimizes the internal structure of the carburetor 3 and the control method of the fuel mixture, realizes precise control of the mixture concentration and overall improvement of the performance of the two-stroke fuel engine, and the two-stroke fuel engine of the present invention has the advantages of compact structure, stable performance, low energy consumption, etc., and has broad application prospects and promotion value in practical applications.

[0085] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A two-stroke fuel engine, comprising a body (1) provided with an intake passage (11) and an outlet passage (12), a chamber (13) communicating with the intake passage (11) and the outlet passage (12) being provided in the body (1), a crankshaft unit (14) and a first piston (15) connected to the crankshaft unit (14) being arranged in the body (1), the crankshaft unit (14) being capable of driving the first piston (15) to perform periodic reciprocating motion, the first piston (15) dividing the chamber (13) into a first chamber (131) and a second chamber (132), a scavenging passage (16) being arranged between the first chamber (131) and the second chamber (132); characterized in that: The machine body (1) is provided with a compression structure (2), the compression structure (2) comprising a pump body (21) and a cam unit (22) connected to the pump body (21), and the cam unit (22) is arranged in the pump body (21); A first pump body cavity (211) is provided in the pump body (21), and the cam unit (22) can drive the volume of the first pump body cavity (211) to increase or decrease; It also includes a main oil-circuit balancing channel (23) and a main fuel-fuel mixture delivery channel (24), one end of each of the main oil-circuit balancing channel (23) and the main fuel-fuel mixture delivery channel (24) being in communication with the first pump body cavity (211), the other end of the main fuel-fuel mixture delivery channel (24) being in communication with the first chamber (131), and the other end of the main oil-circuit balancing channel (23) being in communication with the intake channel (11) and / or the second chamber (132).

2. The two-stroke fuel engine according to claim 1, characterized in that: A carburetor (3) connected to the air intake channel (11) is provided on one side of the machine body (1); an air intake channel (4) is provided between the carburetor (3) and the air intake channel (11); a main oil circuit connecting channel (5) is connected to the carburetor (3); an end of the main oil circuit connecting channel (5) is connected to the first pump body cavity (211); One-way valves are provided on the main oil circuit balancing channel (23), the main fuel mixed gas delivery channel (24) and the main oil circuit connecting channel (5).

3. The two-stroke fuel engine according to claim 2, characterized in that: The crankshaft unit (14) comprises a rotating shaft (141), a crankshaft (142) and a connecting rod (143); the rotating shaft (141) is rotatably connected to the machine body (1); the crankshaft (142) is coaxially mounted on the rotating shaft (141); one end of the connecting rod (143) is eccentrically connected to the crankshaft (142); and the other end of the connecting rod (143) is connected to the first piston (15).

4. The two-stroke fuel engine according to claim 3, characterized in that: The cam unit (22) comprises a cam (221), a tappet (222) slidably connected to the pump body (21), and a second piston (223) connected to the tappet (222); the cam (221) is coaxially fixed on the rotating shaft (141); and the cam (221) is used to drive the second piston (223) to move back and forth.

5. The two-stroke fuel engine according to claim 4, characterized in that: A second pump body cavity (212) is defined in the pump body (21), and the second piston (223) is sealingly and slidably connected between the first pump body cavity (211) and the second pump body cavity (212).

6. The two-stroke fuel engine according to claim 5, characterized in that: The main oil channel balance channel (23) comprises a first oil channel (231), a second oil channel (232) and a third oil channel (233); one end of the first oil channel (231) is connected to a three-way channel (234); one end of the second oil channel (232) and the third oil channel (233) are connected to the first oil channel (231) through the three-way channel (234); The other end of the second oil passage (232) is in communication with the first pump body cavity (211); The other end of the third oil passage (233) is in communication with the second pump body cavity (212).

7. The two-stroke fuel engine according to any one of claims 2 to 5, characterized in that: The carburetor (3) is provided with a high-speed fuel flow channel (31), an idle fuel flow channel (32) and an intake flow channel (33); The high-speed fuel flow channel (31) is connected to the main fuel connection channel (5); The idle fuel flow channel (32) is connected to the intake flow channel (33); A rotary control valve (34) is rotatably connected in the high-speed fuel flow channel (31), and the rotary control valve (34) is used to control the opening and closing of the high-speed fuel flow channel (31); the high-speed fuel flow channel (31) is connected to the idle fuel flow channel (32) through the rotary control valve (34).

8. The two-stroke fuel engine according to claim 7, characterized in that: A throttle regulating rod (351) and a throttle (352) fixed on the throttle regulating rod (351) are rotatably connected in the intake flow passage (33), the throttle (352) being used to open or close the intake flow passage (33), one end of the throttle regulating rod (351) extending out of the carburetor (3) is connected to a throttle linkage plate (353), a first arcuate surface (3531) is provided on the throttle linkage plate (353), and a first protrusion (354) is formed on the throttle linkage plate (353); The rotary control valve (34) is connected to a control valve adjusting rod (361), and the control valve adjusting rod (361) extends out of the carburetor (3) and is connected to a control valve linkage plate (362), on which a second protrusion (363) is formed, and a first torsion spring (364) is sleeved on the control valve adjusting rod (361), and the first torsion spring (364) has a tendency to drive the second protrusion (363) to abut against the first arc surface (3531).

9. The two-stroke fuel engine according to claim 8, characterized in that: A choke adjusting rod (371) and a choke (372) fixed on the choke adjusting rod (371) are rotatably connected in the intake flow passage (33); the choke (372) is used to open or close the intake flow passage (33); one end of the choke adjusting rod (371) extends out of the carburetor (3) and is connected to a choke linkage plate (373); a second arc surface (3731) is provided on the choke linkage plate (373); a second torsion spring (374) is sleeved on the choke adjusting rod (371); the second torsion spring (374) has a tendency to drive the second arc surface (3731) to abut against the first protrusion (354).

10. The two-stroke fuel engine according to claim 7, characterized in that: The carburetor (3) is provided with a high-speed fuel outlet (101) and an idle fuel outlet (102), the high-speed fuel outlet (101) is connected to the high-speed fuel flow channel (31), and the idle fuel outlet (102) is connected to the idle fuel flow channel (32); A high-speed fuel adjustment screw (103) and an idle fuel adjustment screw (104) are provided on one side of the carburetor (3); the high-speed fuel adjustment screw (103) is used to adjust the opening degree of the high-speed fuel outlet (101); and the idle fuel adjustment screw (104) is used to adjust the opening degree of the idle fuel outlet (102).

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