Scroll Compressor Back Pressure Chamber Discharge Guide
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Solution Overview
Problem
The existing scroll compressors face challenges in quickly re-operating due to the accumulation of intermediate pressure refrigerant in the back pressure chamber, which leads to increased initial torque requirements, noise, and reduced operation efficiency when the compressor stops and restarts.
Innovation Solution
The implementation of a scroll compressor design that includes a discharge guide with a recessed part on the orbiting scroll to facilitate the discharge of intermediate pressure refrigerant from the back pressure chamber into a region of lower pressure, allowing for efficient communication between the back pressure chamber and the compression chamber, even when the compressor stops, thereby enabling quick re-operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end of the wrap and the surface of the head plate are strongly attached to each other, then leakage is prevented, but friction increases causing noise and abrasion
Solution Approach 1:
A back pressure chamber is introduced as an intermediary space between the compression chamber and the external environment. This chamber receives intermediate pressure refrigerant through a discharge guide, allowing the wrap and head plate to be firmly attached for sealing while the back pressure chamber absorbs excess pressure to reduce friction and prevent noise and abrasion.
2Device complexity
If the back pressure chamber is formed on the bottom surface of the orbiting scroll, then the structure is simple and bypass hole formation is easy, but the back pressure chamber changes configuration and position causing vibration and noises
Solution Approach 1:
Instead of forming the back pressure chamber on the bottom surface of the orbiting scroll (lower back pressure type), the invention inverts the approach by forming it on the top surface of the fixed scroll (upper back pressure type). This inversion makes the back pressure chamber fixed in configuration and position, preventing vibration and noises while maintaining structural simplicity.
3Productivity
If intermediate pressure refrigerant accumulates in the back pressure chamber when the compressor stops, then the compressor cannot quickly re-operate, but high initial torque is required
Solution Approach 1:
A discharge guide is extracted and formed on the orbiting scroll to create a dedicated discharge path. This guide includes a recessed part that opens to the compression chamber, allowing intermediate pressure refrigerant to be actively discharged from the back pressure chamber even when the compressor stops, enabling quick re-operation without requiring high initial torque.
4Productivity
If the orbiting scroll revolves with respect to the fixed scroll, then compression and discharge are successful, but leakage occurs between the scrolls
Solution Approach 1:
The back pressure chamber acts as an intermediary pressure zone that receives intermediate pressure refrigerant through the discharge guide. This pressure management system maintains adequate attachment between the orbiting scroll and fixed scroll, ensuring sealing effectiveness while allowing successful compression and discharge operations.
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
This design ensures that the compressor can quickly re-start with reduced initial torque requirements, minimizing noise and maintaining operation efficiency by effectively managing the pressure equilibrium within the system.
Implementation Method 1
a back pressure chamber having an intermediate pressure that is defined as a value between a discharge pressure and a suction pressure may be formed on a back surface of the orbiting scroll or fixed scroll
Implementation Method 2
a discharge guide defined in the first or second scroll to guide discharge of a refrigerant within the back pressure chamber
Data Source
Figure 1
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AI summary
Provided is a scroll compressor. The scroll compressor includes a casing including a rotation shaft, a discharge cover fixed inside the casing to partition the inside of the casing into a suction space and discharge space, a first scroll rotating by the rotation shaft to perform an orbiting motion, a second scroll disposed on a side of the first scroll to define a plurality of compression chambers together with the first scroll, the second scroll having an intermediate pressure discharge hole communicating with a compression chamber having an intermediate pressure among the plurality of compression chambers, a back pressure plate coupled to the second scroll, the back pressure plate having an intermediate pressure suction hole communicating with the intermediate pressure discharge hole, a floating plate movably disposed on a side of the back pressure plate to define a back pressure chamber together with the back pressure plate, and a discharge guide defined in the first or second scroll to guide discharge of a refrigerant within the back pressure chamber.