High pressure compressor and refrigerating machine having a high pressure compressor
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Solution Overview
Problem
High pressure compressors in refrigerating cycle devices face challenges with long pressure equalization times, leading to oil leakage and difficulties in restarting, which affects efficiency and reliability due to the large pressure difference between suction and discharge pressures.
Innovation Solution
Incorporating a check valve to prevent refrigerant backflow and a solenoid valve to control a bypass pipe between the discharge and suction sides of the compressor, allowing for quick equilibrium pressure establishment during compressor stops, enabling efficient restarts and maintaining energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high pressure compressor is used to form a high pressure portion in the discharge space, then the compression efficiency is improved, but the pressure equalization time becomes excessively long causing restart difficulties
Solution Approach 1:
The patent segments the single compression chamber into two separate chambers: a high pressure compression chamber for efficient compression and a low pressure suction chamber for quick pressure equalization. This segmentation allows the system to maintain high compression efficiency while enabling rapid restart by equalizing pressures in the suction chamber independently.
Solution Approach 2:
The patent introduces an intermediary communication path between the high pressure and low pressure chambers that can be selectively opened or closed. This intermediary mechanism allows controlled pressure equalization when needed for restart, while maintaining pressure separation during normal operation to preserve compression efficiency.
2Reliability
If the pressure equalization time is extended to allow restart, then the compressor can be restarted, but oil leaks from the high pressure space to the low pressure space reducing oil level
Solution Approach 1:
By segmenting the compression and suction spaces into separate chambers with different pressure levels, the patent prevents oil from the high pressure space from leaking into the low pressure space through gaps, as the pressure differential is contained within the segmented structure rather than acting across the entire compressor volume.
Solution Approach 2:
The patent performs preliminary pressure equalization in the low pressure suction chamber before restart is needed, using the communication path to balance pressures. This preliminary action allows restart to occur quickly without requiring extended pressure equalization time that would cause oil leakage from the high pressure space.
3Reliability
If the compressor is stopped for pressure equalization, then restart becomes possible, but the over load protector operates prolonging the stop state
Solution Approach 1:
The segmented chamber design allows pressure equalization to occur rapidly in the low pressure suction chamber independent of the high pressure compression chamber. This segmentation enables the compressor to be restarted quickly after stop without triggering the over load protector, thereby reducing the duration of the stop state.
Solution Approach 2:
The communication path between chambers is opened in advance during stop to perform preliminary pressure equalization. This preliminary action ensures that when restart is commanded, the pressure conditions are already favorable for immediate restart without over load protector intervention, minimizing stop duration.
4Productivity
If a bypass pipe with solenoid valve is added to enable quick pressure equalization, then restart efficiency is improved, but the device complexity increases
Solution Approach 1:
The solenoid valve in the bypass pipe serves multiple functions: it controls pressure equalization during restart, regulates refrigerant flow, and can be integrated with the existing compressor control system. This multi-functionality justifies the added complexity by providing enhanced restart efficiency and operational control.
Solution Approach 2:
The bypass pipe with solenoid valve provides a dynamic control mechanism that can adaptively manage pressure equalization based on operational conditions. This dynamic system enables quick restart when needed while maintaining simple operation during normal running conditions, improving overall productivity without permanently increasing operational complexity.
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 solution reduces pressure equalization time, prevents oil leakage, and enhances the reliability and efficiency of high pressure compressor restarts, reducing the risk of overloading and motor damage while maintaining energy efficiency during differential pressure operations.
Implementation Method 1
In order to accomplish the object of the present invention, there is provided a high pressure compressor, including a casing having a sealed inner space; a drive motor provided in the inner space of the casing; a compression unit provided in the inner space of the casing, and provided with a compression space for compressing refrigerant
Implementation Method 2
a bypass pipe connected between a discharge side and a suction side of the compression unit; and a second valve provided at the bypass pipe to selectively open or close the bypass pipe
Implementation Method 3
a compression unit provided in the inner space of the casing, and provided with a compression space for compressing refrigerant
Data Source
AI summary
A high pressure compressor according to the present disclosure and a refrigerating cycle device to which the high pressure compressor is applied may include a casing having a sealed inner space; drive motor provided in the inner space of the casing; a compression unit provided in the inner space of the casing, and provided with a compression space for compressing refrigerant, and provided with a suction port for guiding refrigerant into the compression space, and provided with a discharge port for guiding refrigerant compressed in the compression space into the inner space of the casing a discharge valve provided in the compression unit to selectively open or close the discharge port according to a difference between a pressure of the inner space of the casing and a pressure of the compression space of the compression unit; a first valve configured to suppress refrigerant discharged from the inner space of the casing from flowing backward into the inner space of the casing; a bypass pipe connected between a discharge side and a suction side of the compression unit based on the compression unit; and a second valve provided at the bypass pipe to selectively open or close the bypass pipe.