Spring-Loaded Suction Valve Sealing for Compressor Shutdown Leakage
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Solution Overview
Problem
Compressors face refrigerant leakage from the high pressure side to the low pressure side when stopped, leading to increased temperatures in applications like showcase cooling, as existing technologies fail to effectively seal the system during shutdown.
Innovation Solution
A compressor design featuring a suction valve with a seal that moves to the predetermined position upon shutdown, sealing the inner pipe end and preventing backward refrigerant flow, utilizing a combination of a suction valve body, projection portion, and spring to ensure the seal is maintained, even when the compressor is not in operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction valve is not moved to the predetermined position when the compressor stops, then the structure is simple, but the refrigerant leaks from the high pressure side to the low pressure side
Solution Approach 1:
The suction valve is designed to dynamically change position based on compressor operation state. During operation, the valve opens to allow refrigerant flow. When the compressor stops, the valve automatically moves to a predetermined position under spring force to seal the suction port, preventing refrigerant leakage. This dynamic positioning resolves the contradiction by providing both operational functionality and sealing reliability without requiring a completely separate sealing mechanism.
Solution Approach 2:
The suction valve system is self-regulating through the spring mechanism. When compression force decreases during compressor shutdown, the spring automatically pushes the valve to the predetermined position to seal the suction port, preventing refrigerant leakage without external intervention. This self-service mechanism achieves reliable sealing while maintaining relatively simple structure.
2Loss of energy
If the compressor stops temporarily during showcase cooling, then energy consumption is reduced, but the refrigerant leaks causing temperature increase inside the showcase
Solution Approach 1:
The suction valve is designed to proactively seal the suction port at the predetermined position before refrigerant leakage can occur during compressor shutdown. This preliminary sealing action maintains system pressure integrity, preventing temperature increase in the showcase even when the compressor stops temporarily for energy conservation.
3Reliability
If a seal is mounted at the lower end of the suction pipe independently of the suction valve, then the sealing is enhanced, but the device complexity increases
Solution Approach 1:
The suction valve is designed to perform multiple functions: it opens during compression to allow refrigerant flow and automatically positions itself to seal the suction port when the compressor stops. This multi-functionality eliminates the need for separate sealing components, achieving enhanced sealing reliability while maintaining relatively simple device structure.
Solution Approach 2:
The sealing function is merged into the suction valve mechanism itself. The valve body and seal structure are integrated, allowing the suction valve to simultaneously perform flow control during operation and sealing during shutdown. This consolidation achieves reliable sealing without adding independent sealing components, thus maintaining device simplicity.
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 effectively prevents refrigerant leakage from the high pressure side to the low pressure side for a specified period, maintaining the temperature inside the showcase and ensuring efficient operation during temporary compressor stops.
Implementation Method 1
a spring arranged in the suction hole and configured to push the suction valve to a predetermined position in the suction hole
Implementation Method 2
the suction valve is arranged in the suction hole and is configured to allow a flow of the refrigerant from the suction pipe into a compression chamber of the compression mechanism
Data Source
Figure 1
Figure 2~3
Figure 4A~4D
AI summary
The present application discloses a compressor 1 comprising: an outer pipe 50 being connected from an outside to pass through the vessel 10; an inner pipe 52 being closely inserted into the outer pipe 50; a compression mechanism 20 including a suction hole 29 formed of a blind hole and a suction valve 40 in the suction hole 29. The suction valve 40 includes a seal 48 on a side facing an opening 29c of the suction hole 29 to seal an entire end 52a of the inner pipe 52 on a side facing the suction valve 40 when the compressor 1 stops.