Portable Cooling Unit Layout With Sub-Capillary Anti-Clogging
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Solution Overview
Problem
In refrigeration cycles, capillary tubes with small diameters are prone to clogging due to oil sludge adhesion, leading to cooling failures, and existing solutions fail to effectively address this issue without compromising insulation performance or increasing manufacturing costs.
Innovation Solution
A cooling system with a sub-capillary tube having a larger inner diameter and shorter length is integrated between the filter dryer and capillary tube, allowing oil sludge to sacrificially adhere to the sub-capillary tube, preventing clogging and functioning as a filter, while maintaining efficient insulation and easy attachment/detachment without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a capillary tube with small inner diameter is used to reduce length and cost, then productivity and space-saving are improved, but reliability deteriorates due to clogging by oil sludge
Solution Approach 1:
The invention divides the capillary tube into two segments: a first capillary tube with a larger inner diameter and a second capillary tube with a smaller inner diameter. This segmentation allows the first tube to handle oil sludge without clogging while the second tube maintains the desired small diameter for efficient cooling, thus resolving the contradiction between productivity and reliability.
2Device complexity
If the inner diameter of capillary tube is reduced to shorten length, then manufacturing cost and device complexity are reduced, but reliability worsens due to increased clogging risk
Solution Approach 1:
The capillary tube is segmented into two parts with different inner diameters. The first part has a larger diameter that prevents clogging, while the second part has a smaller diameter that reduces overall length and complexity. This segmentation resolves the contradiction between device complexity and reliability.
3Ease of operation
If annealed copper piping is used for flexibility during attachment and detachment, then ease of operation is improved, but reliability deteriorates due to bending and breaking under stress
Solution Approach 1:
The invention uses a flexible hose instead of rigid annealed copper piping. The flexible hose can dynamically adapt to stress during attachment and detachment operations, providing both ease of operation and reliability by preventing bending and breaking that occur with rigid piping.
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 effectively suppresses sludge adhesion on the main capillary tube, ensuring reliable cooling performance, improving insulation, and simplifying the attachment and detachment process, thus enhancing both human-friendly working conditions and temperature maintenance during transportation.
Implementation Method 1
oil sludge is exposed to a high temperature and high pressure in the process of the compression, and metal fine powder is mixed in and denatured into tar-like oil sludge and adheres to the inner wall near the inlet of the capillary tube where the pressure drops rapidly and the flow rate increases
Implementation Method 2
the refrigerant gas is enclosed is used, wherein the refrigeration cycle is configured by a compressor, a condenser, a capillary tube, and an evaporator as main elements
Implementation Method 3
the pressure drops rapidly and the flow rate increases
Implementation Method 4
Refrigerating machine oil is circulated in the piping of the refrigeration cycle for lubricating the mechanisms in the compressor
Data Source
AI summary
A cooling system is configured for arranging a cooling machine and a heat exchanger, for example, inside and outside a heat insulation box. A cooling unit for discharging cooled air by heat exchange using a refrigerant and a heat exchange unit for returning the refrigerant to a coolable condition are connected by a connection portion connecting the upper portions to form an integrated cooling device. The connection portion is arranged so as to straddle an end of a sidewall of the heat insulation box, the cooling unit is arranged inside the heat insulation box, and the heat exchange unit is arranged outside the heat insulation box. During storage or movement by a delivery vehicle, the cooling device is mounted on the heat insulation box. When carrying with hand, only the heat insulation box from which the cooling device is removed can be carried.