Double-Crankshaft Reciprocating Engine for Combustion and Vibration Control
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Solution Overview
Problem
Existing crude oil engines suffer from slow combustion rates, limited operating conditions, and inefficiencies in adapting to complex conditions, leading to restricted maximum speed and power output, along with high noise and vibration.
Innovation Solution
A double crankshaft reciprocating engine design featuring parallel crankshafts, rhombic drive mechanisms, and dual compression and combustion chambers, with synchronized piston and displacer movements to enhance combustion efficiency and reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single crankshaft mechanism is used, then the structure is simple, but the engine produces high noise and vibration and has limited power output
Solution Approach 1:
The single crankshaft is divided into two separate crankshafts (first crankshaft and second crankshaft) that operate in parallel. Each crankshaft drives a separate piston through its own connecting rod, segmenting the power transmission system to reduce vibration and noise while maintaining structural simplicity
Solution Approach 2:
The patent introduces counterweight blocks on the crankshafts and uses the symmetrical arrangement of two crankshafts to cancel out lateral inertia forces. The counterweights balance the rotating masses, reducing vibration and noise generation during engine operation
2Productivity
If the combustion rate is increased to improve power output, then the maximum speed increases, but the combustion becomes incomplete and thermal efficiency decreases
Solution Approach 1:
The engine is divided into two independent working cycles with separate combustion chambers, pistons, and crankshafts. This segmentation allows each cylinder to operate optimally for complete combustion while maintaining high power output through the combined output of both cycles
Solution Approach 2:
The patent employs a four-stroke periodic cycle for each crankshaft-piston assembly, with alternating intake, compression, power, and exhaust strokes. This periodic operation ensures complete combustion cycles while maintaining high rotational speeds through the coordinated operation of both crankshafts
3Productivity
If the engine speed is increased to improve productivity, then the maximum speed increases, but the combustion rate becomes too slow to fully combust the fuel
Solution Approach 1:
By dividing the engine into two separate crankshaft-piston systems, each system can operate at optimized speeds that allow complete combustion. The segmentation enables independent control and optimization of combustion parameters for each cycle while maintaining overall high productivity
Solution Approach 2:
The patent optimizes combustion parameters including air-fuel ratio, compression ratio, and ignition timing for each combustion chamber. These parameter adjustments ensure complete combustion at high speeds by maintaining appropriate combustion rates matched to the operational parameters of each crankshaft system
4Device complexity
If a single compression chamber is used, then the structure is simple, but the engine cannot efficiently adapt to varying operating conditions
Solution Approach 1:
The engine incorporates two separate compression chambers, each associated with its own piston and crankshaft. This segmentation allows each chamber to be independently optimized for different operating conditions, enabling the engine to adapt to varying loads and speeds more effectively
Solution Approach 2:
The dual crankshaft design provides multi-functionality by allowing the engine to operate in different configurations and adapt to various operating conditions. The symmetrical arrangement enables flexible power distribution and adaptation to different operational requirements while maintaining a relatively simple overall structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves combustion conditions, increases engine power and thermal efficiency, and reduces noise and vibration by canceling lateral inertia forces and utilizing a compression chamber for energy storage, allowing broader adaptation to varying operating conditions.
Implementation Method 1
the compression chamber compresses the exhaust gas to store mechanical energy
Implementation Method 2
the fuel and air quickly mix and spontaneously combust, pushing the piston to move downward
Data Source
AI summary
The present invention discloses a double crankshaft reciprocating engine comprising a cylinder assembly and a double crankshaft transmission system. The cylinder assembly comprises a cylinder, a piston and a displacer. An intake valve is provided at the top of the cylinder. The piston is mounted in the cylinder and forms a combustion chamber with an inner wall of the cylinder located above the piston; the displacer is mounted below the piston, and a space between the displacer and the piston is a compression chamber. The piston is provided with first vent holes and a first exhaust valve. The displacer is provided with second vent holes and a second exhaust valve. The double crankshaft transmission system comprises a double crankshaft and a plurality of rhombic drive mechanisms, and the rhombic drive mechanisms are connected to the displacer and the piston through a displacer rod and a piston rod, respectively.