Compressor Radial Arrangement and Counterweight Vibration Control
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Solution Overview
Problem
Conventional rotary compressors face issues with structural stability, assembly complexity, horizontal direction vibration, friction loss, refrigerant leakage, and inefficient lubrication, leading to reduced efficiency and increased noise during refrigerant suction and discharge.
Innovation Solution
A compressor design featuring a hermetic container with a stationary shaft and eccentric portion, where the rotary member is suspended and rotated around the stationary shaft, incorporating a vane mounting structure that reduces vibration and friction, and a lubrication passage for efficient oil supply, allowing for smooth operation and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor unit and compression mechanism unit are stacked on the upper and lower sides, then the compression function is achieved, but the overall height of the compressor is increased
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (upper and lower sides) to a radial arrangement where the compression mechanism is positioned at the radial end of the driving shaft. This dimensional change from axial to radial placement reduces the overall height of the compressor while maintaining the compression function.
2Power
If the motor unit and compression mechanism unit have different weights, then the compression mechanism operates, but a difference in the force of inertia and unbalance is generated
Solution Approach 1:
The patent introduces a counterweight member that rotates together with the driving shaft to compensate for the unbalance caused by the weight difference between the motor unit and compression mechanism unit. This counterweight offsets the inertial force difference, reducing vibration and improving operational stability.
3Speed
If the eccentric portion is rotated with the driving shaft, then the roller is driven, but vibration is generated in the compression mechanism unit
Solution Approach 1:
The patent introduces a bearing as an intermediary component between the eccentric portion and the roller. This bearing supports the roller and reduces the direct transmission of vibration from the eccentric rotation, thereby decreasing vibration in the compression mechanism unit while maintaining roller rotation for compression.
4Speed
If the eccentric portion is continuously in sliding-contact with the cylinder inner surface and vane tip section, then the roller is driven, but a high relative velocity generates friction loss
Solution Approach 1:
The patent replaces the sliding contact mechanism with a rolling contact mechanism by introducing a roller that rotates on the eccentric portion. This substitution reduces the relative velocity at the contact surface and significantly decreases friction loss, improving the efficiency of the compression mechanism.
5Force
If the vane is supported on a groove portion of the cylinder by a spring, then the vane pressesurizes the roller surface, but the structure becomes complex and assembly is difficult
Solution Approach 1:
The patent removes the spring component from the vane support structure and instead uses a simplified groove portion in the cylinder to support the vane. This extraction of the spring mechanism reduces structural complexity and improves ease of assembly while maintaining the necessary pressurization force on the roller surface through the vane's geometric design.
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 structural safety, simplifies assembly, reduces horizontal direction vibration, improves compression efficiency, and effectively manages refrigerant suction and discharge while minimizing noise and refrigerant leakage.
Implementation Method 1
a rotary member (130) installed inside the stator (120) to be rotated by a rotating electromagnetic field from the stator (120)
Implementation Method 2
a roller (133) applied with a rotation force of the cylinder-type rotor (131 and 132), rotated around the eccentric portion (142) with the cylinder-type rotor (131 and 132)
Data Source
AI summary
A compressor is provided in which a rotary member is suspended on a stationary member and rotates to compress a refrigerant. In the stationary member, top and bottom ends of a stationary shaft are fixed to improve structural stability and assembly properties. Bearing covers are provided on a contact portion of the stationary member and the rotary member, such that the rotary member may rotate when suspended on the stationary member, which stabilizes operation. In the rotary member, a vane is integrally formed with a roller and mounted on a vane mounting hole of a cylinder-type rotor. Although, the rotary member is provided on an outer circumferential surface of the stationary member, suction and discharge operations of the refrigerant are performed in an axial direction, which lowers product height. Oil stored in a hermetic container is supplied to a lubrication passage provided between the stationary member and the rotary member.