Scroll Compressor Injection Port Positioning for Refrigerant Flow Control
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Solution Overview
Problem
Existing scroll compressor configurations face issues with refrigerant mixing losses and refrigerating machine oil dilution due to the injection of liquid refrigerant, leading to performance degradation and reliability concerns.
Innovation Solution
A scroll compressor design featuring a sealed container with a motor element, scroll compression element, and a frame that supports the scroll compression element, including a first space for gas refrigerant suction and a second space with communicating paths and injection ports positioned at an angle to direct liquid refrigerant towards the inlet ports, reducing backflow and enhancing fluid directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid refrigerant is injected into the intermediate pressure portion of the compressor, then the discharge temperature decreases, but refrigerant mixing loss increases and compressor performance degrades
Solution Approach 1:
The compressor interior is divided into distinct pressure zones: a first pressure portion (intermediate pressure) and a second pressure portion (high pressure). The injection port is positioned to deliver liquid refrigerant specifically to the second pressure portion, preventing mixing with the intermediate pressure refrigerant stream and thereby eliminating the mixing loss while maintaining the discharge temperature reduction benefit.
Solution Approach 2:
The injection port is strategically positioned at a specific location within the second pressure portion where liquid refrigerant can be introduced without interfering with the main compression flow path. This localized injection approach ensures that refrigerant is injected at the appropriate pressure stage, reducing discharge temperature while avoiding unnecessary mixing losses in the intermediate pressure zone.
2Temperature
If liquid refrigerant is injected during certain rotation phases, then the discharge temperature decreases, but refrigerating machine oil is diluted and compressor reliability degrades
Solution Approach 1:
The injection port is designed to release liquid refrigerant in advance before the movable scroll reaches the critical rotation phase where the intake port closes. This preliminary injection timing ensures that refrigerant is introduced into the compression chamber when the intake port is still open, allowing the refrigerant to be properly contained and compressed without causing oil dilution during the subsequent rotation phases.
Solution Approach 2:
The injection timing is dynamically synchronized with the rotation phase of the movable scroll. The injection port is positioned and controlled to release refrigerant at specific dynamic moments during rotation, ensuring that injection occurs only when the intake port is open and the compression chamber is ready to contain the refrigerant, thereby preventing oil dilution while maintaining temperature reduction benefits.
3Device complexity
If injection pipe is positioned close to the intake port, then the structure is simplified, but liquid refrigerant bounces off the scroll body end and flows back to the oil storage area
Solution Approach 1:
The injection port is positioned in the second pressure portion, utilizing the radial dimension of the compressor interior. This positioning allows the injection pipe to extend in a direction that avoids collision with the movable scroll body end, enabling refrigerant to be delivered directly to the compression chamber without bouncing off surfaces and flowing back to the oil storage area, while maintaining structural simplicity.
Solution Approach 2:
The second pressure portion serves as an intermediary zone between the first pressure portion and the discharge side. The injection port is positioned in this intermediary zone, allowing liquid refrigerant to be introduced at an appropriate intermediate stage of the compression process, preventing direct collision with the movable scroll body and ensuring refrigerant flows into the compression chamber rather than back to the oil storage area.
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 reduces refrigerating machine oil dilution, improves compressor reliability, and decreases discharge temperature while minimizing fluid loss and mixing losses, thereby enhancing the performance of the scroll compressor.
Implementation Method 1
an injection port provided in a part of an outer circumference of the second space between the open end and the inlet port in a circumferential direction and configured to eject liquid refrigerant in a direction toward the inlet port
Implementation Method 2
A second space communicated with the first space through a communicating path is provided on an outer circumferential side of the first scroll body and the second scroll body
Implementation Method 3
an orbiting scroll including a second scroll body configured to be engaged with the first scroll body to form a compression chamber between the first scroll body and the second scroll body
Data Source
AI summary
A second space communicated with a first space through communicating paths is provided on an outer circumferential side of first and second scroll bodies. Scroll end portions of the first and second scroll bodies form an inlet port configured to suck gas refrigerant into a compression chamber from the second space. Open ends of the communicating paths on a side of the second space are located at an angle larger than 0° and less than or equal to 180°, around a central axis of a rotating shaft portion, from the inlet ports in a scroll involute direction of the first scroll body and the second scroll body, respectively. Injection ports in a part of an outer circumference of the second space between the open ends and the inlet ports in a circumferential direction are configured to eject liquid refrigerant in a direction toward the inlet ports, respectively.