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CN-121993300-A - Fuel mixing and feeding mechanism of dual-fuel engine

CN121993300ACN 121993300 ACN121993300 ACN 121993300ACN-121993300-A

Abstract

The invention discloses a fuel mixing and supplying mechanism of a dual-fuel engine, which relates to the field of fuel mixing and comprises a cylinder bridge, a connecting rod, a gas compressing assembly and a cylinder assembly, wherein the gas compressing assembly comprises a gas compressing outer cylinder, a gas compressing inner cylinder, a gas compressing piston and a gas supply mechanism, and the cylinder assembly comprises a cylinder piston, a cylinder sleeve and an oil pumping mechanism. When the air compressing outer cylinder moves along with the cylinder bridge, the air supply mechanism sucks air and fuel gas in a self-priming mode by utilizing the pressure difference of the cavity in the air compressing process, mixes the air and the fuel gas in proportion, conveys the mixed gas into the combustion chamber of the cylinder sleeve, and can realize quantitative supply of the mixed gas without additional pressurizing equipment.

Inventors

  • WU YONGFU

Assignees

  • 通道福原科技有限公司

Dates

Publication Date
20260508
Application Date
20260226

Claims (9)

  1. 1. The fuel mixing and feeding mechanism of the dual-fuel engine comprises a cylinder bridge (1), wherein a connecting rod (10) is arranged in the middle of the cylinder bridge (1) in a rotating manner, the connecting rod (10) is rotationally connected with a crankshaft, the crankshaft is arranged in a crankcase in a rotating manner, two air compressing assemblies (2) are symmetrically arranged on the cylinder bridge (1), one end, far away from the cylinder bridge (1), of each air compressing assembly (2) is provided with a cylinder assembly (3), and the fuel mixing and feeding mechanism is characterized in that, The number of the air compressing assemblies (2) is two, the air compressing assemblies (2) comprise air compressing outer cylinders (20), air compressing inner cylinders (21) are arranged on the inner sides of the air compressing outer cylinders (20) in a sliding mode, the air compressing inner cylinders (21) are arranged on the crankcase, the air compressing inner cylinders (21) are in dynamic sealing connection with the air compressing outer cylinders (20) through piston rings, air compressing pistons (22) are arranged on the inner sides of the air compressing inner cylinders (21) in a dynamic sealing mode through piston rings, air supply mechanisms (23) are arranged on the air compressing pistons (22), and the air supply mechanisms (23) can convey air and fuel gas into the air cylinder assemblies (3) in a self-priming mode; the cylinder assembly (3) comprises a cylinder piston (30), the cylinder piston (30) is arranged at one end of the air compressing outer cylinder (20) away from the cylinder bridge (1) in a threaded fit mode, a cylinder sleeve (31) is arranged on the outer side of the cylinder piston (30) in a dynamic sealing mode through a piston ring and an oil ring, the cylinder sleeve (31) is arranged stationary relative to a crankcase, an oil pumping mechanism (32) is arranged between the two cylinder sleeves (31), and the oil pumping mechanism (32) is used for pumping fuel into the two cylinder sleeves (31).
  2. 2. A fuel mixing and feeding mechanism for a dual-fuel engine according to claim 1, characterized in that a plurality of through holes (210) are uniformly arranged along the circumferential direction of the upper side of one end of the gas cylinder (21) far from the cylinder bridge (1).
  3. 3. A fuel mixing and feeding mechanism for a dual fuel engine according to claim 1, characterized in that a round hole (220) is provided in the middle of the displacer (22), and a mixing space (221) is provided at the end of the displacer (22) facing the cylinder piston (30).
  4. 4. A dual fuel engine fuel mixing and feeding mechanism according to claim 3, characterized in that the air supply mechanism (23) comprises a check valve movable intake valve (230), the check valve movable intake valve (230) is arranged in a round hole (220) in the middle of the air compressing piston (22), one end of a fuel gas inlet pipe (231) is slidably arranged in the middle of the check valve movable intake valve (230), a connecting spring (232) is arranged between the fuel gas inlet pipe (231) and the check valve movable intake valve (230), an air inlet (233) is arranged at one end of the air compressing inner cylinder (21) close to the crankcase, and the other end of the fuel gas inlet pipe (231) penetrates through and is fixedly arranged on the air inlet (233).
  5. 5. A fuel mixing and feeding mechanism for a dual-fuel engine according to claim 4, characterized in that one end of the displacer (22) far from the mixing space (221) is connected with the displacer inner cylinder (21) through a buffer spring (222), and the buffer spring (222) is arranged on the inner side of the displacer inner cylinder (21).
  6. 6. A fuel mixing and feeding mechanism for a dual-fuel engine according to claim 1, characterized in that the combustion chamber (310) is provided on the upper side of the interior of the cylinder liner (31), an exhaust valve (311) is provided on the lower side of the outer end of the cylinder liner (31), and the exhaust valve (311) is provided at the lower end of the combustion chamber (310), and the start and stop of the exhaust valve (311) is controlled by the stroke of the cylinder piston (30).
  7. 7. The fuel mixing and supplying mechanism of a dual-fuel engine according to claim 6, characterized in that the cylinder piston (30) comprises a piston seat (300), an air intake scavenging passage (301) is arranged in the middle of the piston seat (300), the air intake scavenging passage (301) penetrates through the piston seat (300), a spring seat groove (302) is arranged on the inner side of the air intake scavenging passage (301), a piston valve (303) is arranged in the air intake scavenging passage (301) and the spring seat groove (302) in a sliding manner, a spring clamping plate (304) is arranged at one end of the piston valve (303) facing the displacer (22) in a threaded manner, a return spring (305) is arranged between the spring clamping plate (304) and the spring seat, the return spring (305) is arranged in the spring seat groove (302) and sleeved on the outer side of the piston valve (303), a connecting part (306) is arranged at one end of the piston seat (300) facing the displacer (22), and the piston seat (300) is in a threaded connection with the outer cylinder (20) through the connecting part (306).
  8. 8. A fuel mixing and feeding mechanism for a dual fuel engine as claimed in claim 7, wherein the end of the piston valve (303) away from the spring clamping plate (304) is provided with the combustion chamber (310), and the combustion chamber (310) on the piston valve (303) is a circular arc groove.
  9. 9. A fuel mixing and feeding mechanism for a dual-fuel engine according to claim 1, characterized in that the pumping mechanism (32) comprises a high-pressure fuel pump (320), one end of the high-pressure fuel pump (320) is connected with a high-pressure fuel pipe (321), the high-pressure fuel pipe (321) is of a T-shaped structure, two fuel nozzles (322) are symmetrically arranged at one end of the high-pressure fuel pipe (321) away from the high-pressure fuel pump (320), and one fuel nozzle (322) is arranged at each end of the cylinder liner (31).

Description

Fuel mixing and feeding mechanism of dual-fuel engine Technical Field The invention relates to the technical field of fuel mixing, in particular to a fuel mixing and feeding mechanism of a dual-fuel engine. Background The dual-fuel engine is an internal combustion engine capable of simultaneously using fuel oil and natural gas, realizes flexible switching through two sets of independent fuel supply systems, and is widely applied to the fields of ships, generator sets and the like. The core technology comprises a high-pressure common rail diesel injection and gas fuel injection cooperative working system, and the main fuel quantity of natural gas is ignited by adopting diesel pre-injection so as to reduce the emission of unburned methane. The fuel switching system can automatically select an optimal mode according to working conditions, can still realize reliable starting in a low-temperature environment, and can automatically switch to a pure diesel mode when the natural gas supply is interrupted. The prior art has the defects that the existing fuel mixing mechanism of the dual-fuel engine has the problems of low combustion efficiency and large fluctuation of power output due to unbalanced proportion and unmatched supply rhythm when two fuels are mixed, and the air supply system of the existing fuel mixing mechanism generally depends on external power for ensuring stable gas and air supply, has a complex structure and high energy consumption, and is difficult to adapt to the problems of accurate air and gas delivery under different rotating speeds and load working conditions of the engine. Disclosure of Invention The invention aims to provide a fuel mixing and feeding mechanism of a dual-fuel engine, which aims to solve the defects in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: The fuel mixing and feeding mechanism of the dual-fuel engine comprises a cylinder bridge, wherein a connecting rod is arranged in the middle of the cylinder bridge in a rotating manner, the connecting rod is rotationally connected with a crankshaft, the crankshaft is arranged in a crankcase in a rotating manner, two air compression assemblies are symmetrically arranged on the cylinder bridge, and one end, far away from the cylinder bridge, of each air compression assembly is provided with a cylinder assembly; The number of the air compressing assemblies is two, the air compressing assemblies comprise air compressing outer cylinders, the inner sides of the air compressing outer cylinders are provided with air compressing inner cylinders in a sliding mode, the air compressing inner cylinders are arranged on the crank case, the air compressing inner cylinders are in dynamic sealing connection with the air compressing outer cylinders through piston rings, the inner sides of the air compressing inner cylinders are provided with air compressing pistons in dynamic sealing mode through piston rings, the air compressing pistons are provided with air supply mechanisms, and the air supply mechanisms can convey air and fuel gas into the air cylinder assemblies in a self-priming mode; The cylinder assembly comprises a cylinder piston, the cylinder piston is arranged at one end of the air compressing outer cylinder, which is far away from the cylinder bridge, in a threaded fit mode, a cylinder sleeve is arranged on the outer side of the cylinder piston in a movable sealing mode through a piston ring and an oil ring, the cylinder sleeve is arranged stationary relative to a crankcase, an oil pumping mechanism is arranged between the two cylinder sleeves, and the oil pumping mechanism is used for pumping fuel into the two cylinder sleeves. Above-mentioned, the gas-compressing inner tube is kept away from the one end upside of cylinder bridge evenly is provided with a plurality of through-holes along its circumference. Above-mentioned, the middle part of air compressing piston is provided with the round hole, and air compressing piston towards the one end of cylinder piston is provided with mixing space. Above-mentioned, the air feed mechanism includes the check valve activity intake valve, the check valve activity intake valve sets up in the round hole at air compressing piston middle part, the middle part of check valve activity intake valve slides and is provided with the one end of gas intake pipe, gas intake pipe with be provided with connecting spring between the check valve activity intake valve, the air compressing inner tube is close to the one end of crankcase is provided with the air inlet, the other end of gas intake pipe passes and fixedly set up on the air inlet. Above-mentioned, the one end that the gas compressing piston was kept away from the mixing space pass through buffer spring with the gas compressing inner tube links to each other, just buffer spring sets up the inboard of gas compressing inner tube. Above-mentioned, the inside upside of cylinder liner i