Outdoor unit and refrigeration cycle device
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Solution Overview
Problem
In refrigeration cycle apparatuses, the high-pressure-side pressure on the outlet side of the compressor increases due to load fluctuations, leading to unsuppressed pressure increases, particularly in high load states, which can cause inefficiencies and operational challenges.
Innovation Solution
An outdoor unit with an injection circuit that includes an expansion valve, a receiver, and a flow control valve, where the controller adjusts the degree of opening of these valves to increase the gas-flow ratio of refrigerant returned to the compressor when pressure exceeds a threshold, reducing the liquid refrigerant stored in the receiver and circulating refrigerant amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple release capillary tubes are provided on the outlet side of the absorber tank to enable stepwise refrigerant release according to load fluctuations, then the refrigerant release amount can be adjusted in steps, but the high-pressure-side pressure increase cannot be suppressed in high load states
Solution Approach 1:
The patent applies dynamics by making the refrigerant release mechanism continuously adjustable rather than fixed in steps. The electronic expansion valve replaces the fixed capillary tubes, allowing the release amount to be dynamically adjusted according to real-time pressure conditions and load requirements, thus resolving the contradiction between adaptability and pressure control
Solution Approach 2:
The patent changes the key parameter of refrigerant release from discrete stepwise values to continuous adjustable values. By using an electronic expansion valve with variable opening degrees, the system can precisely control the refrigerant release amount to match varying load conditions while maintaining pressure within acceptable ranges
2Quantity of substance
If the degree of opening of the release valve is increased in high load state to increase liquid refrigerant flow, then the refrigerant release amount increases, but the pressure on the outlet side of the compressor increases
Solution Approach 1:
The patent implements feedback control by using a pressure sensor to detect the high-pressure-side pressure and a controller to adjust the electronic expansion valve opening degree based on the detected pressure. This closed-loop feedback mechanism ensures that the refrigerant release amount is automatically adjusted to maintain pressure within acceptable ranges while meeting cooling demands
Solution Approach 2:
The system dynamically adjusts the refrigerant release amount in real-time based on actual operating conditions. The electronic expansion valve can be precisely controlled to release the exact amount of refrigerant needed, avoiding both excessive release (which would cause pressure drops) and insufficient release (which would cause pressure buildup)
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 suppresses the increase in pressure on the compressor outlet side by increasing the gas-flow ratio and reducing the liquid refrigerant circulation, enhancing the efficiency of the refrigeration cycle apparatus.
Implementation Method 1
an expansion valve (70) decompresses the refrigerant (81)
Implementation Method 2
a condenser (20) configured to condense the refrigerant output from the compressor
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An injection circuit is configured to return part of refrigerant on an outlet side of a condenser (20) to a compressor (10) without passing through a load unit (3). An expansion valve (70) is provided on a pipe branched from the outlet side of the condenser (20). A receiver (71) is provided on a low-pressure side of the expansion valve (70) and configured to accumulate refrigerant in a gas-liquid two-phase state. A flow control valve (72) is provided downstream of the receiver (71). When a pressure of the refrigerant output from the compressor (10) exceeds a threshold value, a controller (100) increases a degree of opening of the expansion valve (70) and increases a gas-flow ratio of refrigerant returned from the receiver (71) to the compressor (10) by adjusting a degree of opening of the flow control valve (72), more than when the pressure is equal to or less than the threshold value.