Scroll Compressor Reed Valve Directing Discharge Flow Away From Injection Tube
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Solution Overview
Problem
In hermetic scroll compressors, refrigerant passing through injection or bypass pipes is heated by high-temperature refrigerant in the discharge chamber, leading to ineffective cooling of the compression chamber and reduced compression efficiency.
Innovation Solution
A reed valve is positioned to blow refrigerant discharged from the discharge port in a direction away from the pipe unit, preventing direct contact and minimizing temperature rise, with the pipe unit placed on the rear side of the blowing direction, and optionally installed on a perpendicular bisector of the discharge ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the injection pipe or bypass pipe is installed so that the refrigerant discharged from the discharge port flows toward the pipe, then the pipe structure is simplified, but the refrigerant passing through the pipe is heated by high-temperature refrigerant
Solution Approach 1:
The harmful thermal interaction between the discharged refrigerant and the pipe unit is extracted and eliminated by positioning the pipe unit outside the direct flow path of the high-temperature refrigerant, allowing the pipe structure to remain simple while preventing unwanted heating
Solution Approach 2:
The discharge chamber acts as an intermediary space that separates the discharge port from the pipe unit, allowing the refrigerant to be discharged and mixed with cooler refrigerant before potentially contacting the pipe unit, thus mediating the thermal interaction
2Device complexity
If the refrigerant passing through the injection pipe is heated, then the pipe structure can be simpler, but the inside of the compression chamber cannot be cooled
Solution Approach 1:
The heating effect that would otherwise occur in the injection pipe is extracted and eliminated by positioning the pipe outside the direct path of hot discharged refrigerant, preserving the cooling function while maintaining structural simplicity
Solution Approach 2:
The reed valve is configured to preliminarily direct the discharged refrigerant away from the injection pipe before the refrigerant can heat the pipe, preventing the harmful thermal effect before it occurs
3Device complexity
If the refrigerant passing through the bypass pipe is heated, then the installation is simpler, but the compression efficiency is lowered
Solution Approach 1:
The unwanted heating of bypass pipe refrigerant is extracted and eliminated by strategic positioning of the pipe unit, maintaining simple installation while preserving compression efficiency
Solution Approach 2:
The discharge chamber serves as an intermediary zone that allows thermal mixing of refrigerant streams before the refrigerant contacts the bypass pipe, mediating the temperature interaction to prevent efficiency loss
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 configuration effectively suppresses the temperature rise of refrigerant passing through the pipe unit, ensuring proper cooling of the compression chamber and maintaining compressor performance.
Implementation Method 1
a reed valve disposed in the discharge port of the discharge cover or the fixed scroll, and having a configuration in which the refrigerant discharged from the discharge port to the discharge chamber is blown in a direction away from the pipe unit
Implementation Method 2
A liquid refrigerant is supplied to the compression chamber via the injection pipe. In this manner, a temperature of the refrigerant is lowered by latent heat generated when the liquid refrigerant evaporates, thereby cooling the inside of the compression chamber.
Implementation Method 3
a temperature of the refrigerant is lowered by latent heat generated when the liquid refrigerant evaporates
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
This hermetic scroll compressor includes: a hermetic housing; a scroll compressing mechanism housed in the hermetic housing; a discharge cover (3) provided with a discharge port (29) through which a refrigerant compressed by the scroll compressing mechanism passes; a discharge chamber formed between the hermetic housing and the discharge cover (3); an injection tube (50) provided so as to be passed inside the discharge chamber, and within which the refrigerant flows; and a reed valve (40) that is provided to the discharge port (29) of the discharge cover (3), and that is configured such that the refrigerant discharged from the discharge port (29) to the discharge chamber is ejected in a direction separating from the injection tube (50).