Fluid machine, heat exchanger, and operating method of fluid machine
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional piston-type compressors experience instability and high vibration due to an unfixed eccentric distance between the cylinder and rotating shaft, leading to increased suction and exhaust noises, reduced efficiency, and low volume efficiency.
Innovation Solution
A fluid machinery design with a rotating shaft and cylinder having a fixed eccentric distance, where the piston component features a variable volume cavity, allowing stable rotation and reduced vibration by maintaining a constant center of mass, and incorporating a cross slider mechanism for efficient gas compression and exhaust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional piston-type compressor uses a crankshaft and connecting rod mechanism to drive piston reciprocating motion, then gas compression function is achieved, but the structure becomes complex and lateral force on the crankshaft increases
Solution Approach 1:
The patent extracts and eliminates the connecting rod from the traditional crankshaft mechanism, directly connecting the piston to the rotating shaft. This simplifies the structure by removing unnecessary components while maintaining the compression function through direct drive geometry
Solution Approach 2:
Instead of using a crankshaft to convert rotational motion to reciprocating motion, the patent inverts the approach by using a rotating shaft with offset center that directly drives piston reciprocating motion through geometric arrangement, eliminating the need for complex connecting mechanisms
2Power
If a traditional piston-type compressor uses suction and exhaust valves for gas flow control, then compression cycles are achieved, but suction and exhaust noises increase and resistance increases
Solution Approach 1:
The patent completely removes the suction and exhaust valves from the system. Gas flow control is achieved through the geometric arrangement of the rotating shaft and piston, which naturally creates intake and exhaust ports at appropriate positions during rotation, eliminating valve-related noises and resistances
Solution Approach 2:
The patent replaces the mechanical valve system with a geometric flow control mechanism where the rotating shaft and piston arrangement automatically opens and closes gas passages through their relative motion, eliminating moving valve parts and associated noise
3Ease of operation
If a traditional piston-type compressor uses a crankshaft with eccentric mass to drive piston motion, then reciprocating motion is achieved, but large vibration occurs
Solution Approach 1:
The patent uses an asymmetric geometric arrangement where the rotating shaft center is offset from the piston center, creating the necessary reciprocating motion through this fixed eccentricity rather than through rotating eccentric mass, thereby eliminating vibration while maintaining motion functionality
4Force
If a traditional piston-type compressor uses large lateral force on the crankshaft and piston, then motion drive is achieved, but the piston is easy to abrade and sealing property reduces
Solution Approach 1:
The patent removes the connecting rod that transmits lateral forces between the piston and crankshaft. The direct connection between piston and rotating shaft eliminates the lateral force transmission path, reducing abrasion and maintaining sealing properties while still achieving motion drive through geometric arrangement
5Ease of manufacture
If a traditional piston-type compressor has clearance volume and large leakage paths, then assembly is simplified, but volume efficiency becomes low and difficult to increase
Solution Approach 1:
The patent converts the potential harm of clearance volume by designing the rotating shaft and piston geometry such that clearance volume is minimized through precise geometric arrangement. The system transforms what could be a source of leakage into an efficient compression chamber by carefully controlling port timing and chamber geometry
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 enhances operational stability, reduces clearance volume, and increases the reliability of heat exchange equipment by ensuring a regular pattern of volume change, thereby improving the compressor's efficiency and sealing properties.
Implementation Method 1
the axis of the rotating shaft and the axis of the cylinder being eccentric to each other and at a fixed eccentric distance
Implementation Method 2
the center of mass of an eccentric portion in a piston-type compressor makes a circular motion to generate a size-invariable and direction-variable centrifugal force
Implementation Method 3
the sliding segment is provided with sliding fit surfaces, and the sliding fit surfaces are in sliding fit with an inner wall surface of the sliding hole of the piston in a direction vertical to an axial direction of the rotating shaft
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A fluid machinery, a heat exchange equipment, and an operating method for fluid machinery. The fluid machinery includes: a rotating shaft (10), a cylinder (20) and a piston component (30). The axis of the rotating shaft (10) and the axis of the cylinder (20) are eccentric to each other and at a fixed eccentric distance. The piston component (30) is provided with a variable volume cavity (31), pivotally provided in the cylinder (20). The rotating shaft (10) is drivingly connected with the piston component (30) to change the volume of the variable volume cavity (31). Because the eccentric distance between the rotating shaft (10) and the cylinder (20) is fixed, the rotating shaft (10) and the cylinder (20) rotate around the respective axes thereof during motion, and the position of the center of mass remains unchanged, so that the piston component (30) is allowed to rotate stably and continuously when moving in the cylinder (20); and vibration of the fluid machinery is effectively mitigated, a regular pattern for changes in the volume of the variable volume cavity is ensured, and clearance volume is reduced, thereby increasing the operational stability of the fluid machinery, and increasing the working reliability of heat exchange equipment.