Liquid-Cooled Rotary Compressor Coolant Supply Method
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Solution Overview
Problem
Existing liquid-cooled rotary compressors face issues with reduced coolant injection speed when the amount of coolant injected into the compression chamber decreases, leading to inadequate lubrication, sealing, and cooling performance.
Innovation Solution
A liquid-cooled rotary compressor system that adjusts the coolant supply based on the compressor's load factor by using a liquid amount adjusting unit and a compressed gas supply path to maintain a constant volume flow rate of the gas-liquid mixed fluid, ensuring sufficient coolant reaches the rotating wall surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the amount of coolant injected into the compression chamber is decreased to reduce power consumption, then the acceleration work given to the coolant is reduced and power consumption is reduced, but the injection speed of the coolant decreases and the coolant does not sufficiently reach the rotating wall surface
Solution Approach 1:
Compressed gas is introduced as an intermediary substance to mix with the coolant in a gas-liquid mixing unit. This compressed gas acts as a mediator that carries the coolant into the compression chamber, enabling the coolant to reach the rotating wall surface at sufficient speed even when the coolant amount is reduced, thereby resolving the contradiction between reduced power consumption and maintained injection speed
Solution Approach 2:
The system changes the physical state and parameters of the coolant delivery by introducing compressed gas. The compressed gas provides additional kinetic energy and pressure to the coolant mixture, changing the delivery parameters to maintain injection speed despite reduced coolant flow rate, thus achieving both lower power consumption and adequate cooling performance
2Use of energy by moving object
If the amount of coolant injected into the compression chamber is decreased, then power consumption is reduced by reducing acceleration work, but lubrication and sealing between rotating wall surfaces cannot be sufficiently performed
Solution Approach 1:
Compressed gas serves as a carrier that transports the reduced amount of coolant effectively to the compression chamber. This intermediary compressed gas ensures that even a smaller quantity of coolant can reach and coat the rotating wall surfaces adequately, maintaining lubrication and sealing reliability while consuming less power
Solution Approach 2:
The system utilizes pneumatic principles by introducing compressed gas to deliver the coolant. The compressed gas provides the necessary pressure and velocity to ensure the coolant reaches the rotating wall surfaces effectively, maintaining reliable lubrication and sealing with reduced coolant quantity and lower power consumption
3Use of energy by moving object
If the amount of coolant injected into the compression chamber is decreased, then power consumption is reduced, but slow cooling of the compressed gas cannot be sufficiently performed
Solution Approach 1:
The compressed gas intermediary not only transports the coolant but also enhances the cooling efficiency. By mixing with the coolant and being injected together, the compressed gas increases the contact between the coolant and the compressed gas in the compression chamber, improving heat exchange efficiency and maintaining adequate cooling performance with reduced coolant amount
Solution Approach 2:
The system changes the delivery parameters of the coolant by using compressed gas, which improves the distribution and contact of the coolant with the compressed gas. This parameter change in delivery method enhances the cooling efficiency per unit of coolant, allowing sufficient cooling performance with reduced coolant quantity and lower power consumption
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 approach effectively suppresses the decrease in coolant injection speed, ensuring reliable lubrication, sealing, and cooling performance even when the coolant amount is reduced, while reducing power consumption by minimizing oil stirring loss.
Implementation Method 1
a liquid injection path that injects a coolant into the compression chamber
Implementation Method 2
a compressed gas supply path configured to supply compressed gas to a downstream side of the liquid amount adjusting unit in the liquid injection path
Implementation Method 3
separated from the compressed gas by a gas-liquid separator such as an oil separator
Implementation Method 4
The separated liquid is subjected to heat exchange by a cooler to be cooled
Data Source
AI summary
A liquid-cooled rotary compressor includes a compressor main body having a compression chamber formed by a fixed wall and a rotating wall and compressing gas, and a liquid injection path for injecting a coolant into the compression chamber, and adjusts a discharge flow rate by changing a rotational speed of the rotating wall. The compressor includes a liquid amount adjusting unit that adjusts an amount of the coolant supplied from the liquid injection path to the compressor main body according to a change in the rotational speed of the rotating wall, and a compressed gas supply path that supplies compressed gas to a downstream side of the liquid amount adjusting unit in the liquid injection path. The compressed gas is supplied from the compressed gas supply path to the liquid injection path according to the amount of the coolant supplied to the compressor main body.