Liquid blocking device and evaporator thereof
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Solution Overview
Problem
Existing liquid blocking devices for evaporators are inadequate in reducing liquid entrainment without significantly increasing refrigerant gas pressure drop, which can harm compressors and affect heat exchange performance.
Innovation Solution
A liquid blocking device featuring a combination of a plate-shaped first separator with holes and a mesh-shaped second separator, which generates a lower pressure drop, allowing for multiple stages of separation to enhance gas-liquid separation efficiency without excessive pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a baffle is provided at the suction port to intercept liquid, then liquid blocking effect is improved, but pressure drop increases
Solution Approach 1:
The liquid blocking device is divided into two functional segments: a first separator (baffle) for initial liquid interception and a second separator (mesh structure) for fine filtration. This segmentation allows each component to perform its specific function with optimized pressure drop characteristics, where the mesh structure provides effective liquid blocking with minimal pressure loss compared to traditional single-baffle designs.
Solution Approach 2:
The second separator employs a mesh structure with numerous small openings that act as a porous filtration layer. This porous structure effectively captures liquid droplets through surface tension and capillary effects while maintaining low flow resistance, thereby achieving good liquid blocking effect without significant pressure drop increase.
2Reliability
If traditional separation structure is used, then liquid entrainment is reduced, but pressure drop increases
Solution Approach 1:
The invention transitions from traditional planar baffle separation to a three-dimensional mesh structure for the second separator. This dimensional change creates a large surface area with numerous small openings distributed throughout the separator, enabling effective liquid droplet capture through multiple pathways while maintaining open flow channels that minimize pressure drop.
Solution Approach 2:
The mesh structure of the second separator functions as a porous medium that allows gas to pass through while intercepting liquid droplets. The porous structure provides numerous capture sites for liquid entrainment removal while maintaining low flow resistance, achieving effective separation with minimal pressure loss.
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 dual-separation design effectively reduces liquid entrainment in refrigerant gas, minimizing compressor damage and improving the overall refrigeration circuit efficiency and heat exchange performance without excessive pressure drop.
Implementation Method 1
a pressure drop generated when a fluid passes through the first separator
Implementation Method 2
a pressure drop generated when a fluid passes through the second separator via the openings is less than a pressure drop generated when the fluid passes through the first separator
Implementation Method 3
When the gas passes through the baffle, it may change its path, and at the same time it collides with the baffle. The liquid droplets are attached to the baffle
Implementation Method 4
gather into large liquid droplets during a descending process along the baffle, and finally fall down under the gravity
Data Source
AI summary
The present application discloses an evaporator and a liquid blocking device thereof. The liquid blocking device includes: a body, which has a plate-shaped first separator extending in a longitudinal direction, the first separator having a plurality of holes, and the plurality of holes communicating an exterior of the body with an interior of the body; and a second separator attached to the body, the second separator being configured to have a plurality of openings which abut each other, so that a pressure drop generated when a fluid passes through the second separator via the openings is less than a pressure drop generated when the fluid passes through the first separator. The present application can improve the effect of gas-liquid separation.