High-Pressure Dome Scroll Compressor Shared Mount for Cooling
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Solution Overview
Problem
The existing scroll compressor design with an inlet tube results in a larger number of components, complicating the manufacturing process and reducing operating efficiency due to heat transfer from high-pressure refrigerant to low-pressure refrigerant, leading to decreased density and mass of refrigerant sucked into the compression chamber.
Innovation Solution
A single attachment portion on the fixed end plate of the fixed scroll is used to attach both the suction pipe for low-pressure fluid and the second passage member for intermediate-pressure fluid, with the intermediate-pressure fluid cooling the attachment portion to reduce temperature increase in the low-pressure fluid, and the injection pipe is offset from the axial direction to maintain a distance and facilitate connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the suction pipe is surrounded by an inlet tube to reduce heat transfer, then the low-pressure refrigerant is protected from heating, but the number of components increases and the manufacturing process becomes complicated
Solution Approach 1:
The patent merges the suction pipe and the cooling function into a single integrated structure. The suction pipe itself is designed with a dual-function: it serves as both the conduit for low-pressure refrigerant and as the cooling element through which intermediate-pressure refrigerant flows. This eliminates the need for a separate inlet tube while achieving the same heat transfer reduction effect.
Solution Approach 2:
The suction pipe is given multiple functions: it transports low-pressure refrigerant to the compression chamber and simultaneously acts as a heat exchanger by allowing intermediate-pressure refrigerant to flow through it for cooling purposes. This multi-functionality reduces the overall component count while maintaining the temperature control benefit.
2Power
If the fixed scroll is exposed to high-temperature, high-pressure refrigerant in the casing, then the compression mechanism can operate, but the low-pressure refrigerant is heated during flow, decreasing its density and mass
Solution Approach 1:
The patent applies preliminary cooling action by introducing intermediate-pressure refrigerant into the suction pipe before the low-pressure refrigerant completes its flow to the compression chamber. This pre-cooling prevents the temperature rise that would otherwise occur during flow, thereby maintaining the density and mass of the low-pressure refrigerant.
Solution Approach 2:
The intermediate-pressure refrigerant serves as a cooling intermediary. It flows through the suction pipe to absorb heat from the low-pressure refrigerant, acting as a mediator that transfers thermal energy away from the suctioned refrigerant without directly mixing with it, thus preserving the mass and density of the low-pressure refrigerant.
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 improves the operating efficiency of the scroll compressor by minimizing temperature increase in the low-pressure refrigerant, maintaining its density and mass, thereby enhancing performance without increasing the number of components.
Implementation Method 1
The attachment portion (60) exposed to the high-pressure fluid in the casing (11) is cooled by the intermediate-pressure fluid supplied from the second passage member (70) to the compression mechanism (30)
Data Source
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AI summary
A high-pressure dome-type scroll compressor includes a first passage member (12) and a second passage member (70). The first passage member (12) is connected to a suction passage of a fixed scroll (40) to guide a low-pressure fluid to a compression mechanism. The second passage member (70) is connected to an injection passage of the fixed scroll (40) to guide an intermediate-pressure fluid to the compression mechanism. An attachment portion (60) protruding on a back surface of a fixed end plate (41) of the fixed scroll (40) is provided. The first passage member (12) and the second passage member (70) are both attached to the attachment portion (60).