Rotary Compressor Backflow Prevention via Controlled Air Release
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Solution Overview
Problem
Conventional air compression devices using rotary compressors face issues with backflow of compressed air after shutdown, leading to abnormal sound and potential durability problems, and existing solutions require expensive high-temperature check valves to prevent backflow, which are not effective in low-pressure suction channels.
Innovation Solution
An air compression device with a rotary compressor, a discharge flow channel, a release flow channel, and an operation control unit that performs a release operation to expel remaining compressed air to the outside, preventing backflow without the need for a high-temperature check valve by using a check valve downstream of the dehumidifiers and an electromagnetic valve to control the release flow channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is provided in the discharge flow channel between the compressor and the after cooler to prevent backflow, then backflow prevention is improved, but the cost increases due to the need for expensive high-temperature oriented seal members
Solution Approach 1:
The patent applies preliminary action by stopping the compressor before the check valve to prevent backflow. The control unit stops the compressor when the air tank reaches a predetermined pressure, preventing compressed air from flowing backward through the check valve and rotating the scroll in reverse. This eliminates the need for expensive high-temperature seal members while maintaining backflow prevention reliability.
Solution Approach 2:
The patent extracts the check valve from the high-temperature zone between the compressor and after cooler, placing it downstream where temperatures are lower. This allows the use of less expensive seal members that cannot withstand extreme temperatures, thereby reducing maintenance costs while still preventing backflow effectively.
2Use of energy by moving object
If the compressor is stopped immediately when pressure is sufficient, then energy consumption is reduced, but backflow occurs causing abnormal sound and potential durability issues
Solution Approach 1:
The patent applies preliminary action by stopping the compressor in advance before backflow can occur. The control unit monitors air tank pressure and stops the compressor when the predetermined pressure is reached, preventing compressed air from flowing backward and causing abnormal sounds or durability issues.
Solution Approach 2:
The patent uses feedback control by continuously monitoring the air tank pressure and using this information to control the compressor operation. When the pressure reaches the predetermined level, the control unit receives feedback and stops the compressor, thereby preventing both energy waste and backflow-related problems.
3Device complexity
If a check valve is provided in the suction flow channel, then installation is simplified, but backflow of high-temperature compressed air cannot be completely prevented
Solution Approach 1:
The patent extracts the check valve from the suction flow channel and places it in the discharge flow channel downstream of the after cooler. This positioning allows the valve to effectively prevent backflow of high-temperature compressed air while still maintaining relatively simple installation requirements.
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
Effectively prevents backflow and associated abnormal sounds, reducing maintenance costs by eliminating the need for expensive high-temperature check valves and ensuring the compressor's durability.
Implementation Method 1
an air compression device 1 which generates compressed air
Implementation Method 2
the air which is brought to a high temperature state by compression in a compressor is cooled by an after cooler (a cooler)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An air compression device (1) is provided with a rotary compressor (21), a discharge flow channel (11) connected to a discharge portion of the compressor (21), a release flow channel (13) disposed to be connectable to the discharge flow channel (11), and an operation control unit (41) configured to perform a release operation of releasing a part or all of compressed air remaining in the discharge flow channel (11) through the release flow channel (13) when the operation control unit (41) controls to stop the compressor (21).