Hermetic Compressor Suction Hole Geometry for Lower Flow Resistance
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Solution Overview
Problem
The manufacturing of hermetic compressors with complex valve plate configurations is challenging due to sudden changes in passage cross-sectional areas, leading to increased suction resistance and reduced compression efficiency.
Innovation Solution
A hermetic compressor design featuring a valve plate with a suction hole having a non-recessed closed-curve shape and a communication pipe outlet with a curved protruding shape, facilitating smooth gas flow and reducing suction resistance by eliminating complex mold fabrication requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction hole is formed in a complex substantially U shape to reduce suction resistance, then the suction mass of cooling medium gas increases, but the manufacturing complexity of the valve plate increases and the mold fabrication becomes difficult
Solution Approach 1:
The suction hole is designed with a curved bottom portion that provides a smooth transition for gas flow, reducing suction resistance without requiring a complex U-shape. The curved geometry maintains reliable gas flow while being manufacturable using standard powder metallurgy processes.
2Ease of operation
If the suction hole has a complex U shape with transition portions, then the gas flow smoothness improves, but the cross-sectional area suddenly changes from round to U-shape increasing suction resistance
Solution Approach 1:
The bottom portion of the suction hole is formed with a curved shape that provides gradual transition for gas flow, eliminating sudden cross-sectional area changes. This curved geometry reduces suction resistance by maintaining smooth gas flow from the communication pipe into the cylinder.
3Productivity
If the suction hole has a complex U shape, then the gas flow path is optimized, but the mold fabrication process becomes complex and time-consuming
Solution Approach 1:
The suction hole employs a curved bottom portion that optimizes gas flow paths while maintaining a relatively simple overall geometry. This design can be fabricated using standard powder metallurgy molding processes without requiring complex mold fabrication, thereby reducing manufacturing time.
4Ease of manufacture
If the suction hole has a simple shape, then the valve plate manufacturing is easier, but the suction resistance increases and compression efficiency decreases
Solution Approach 1:
The suction hole incorporates a curved bottom portion that enhances gas flow characteristics and reduces suction resistance, thereby improving compression efficiency. The overall shape remains relatively simple and manufacturable using standard powder metallurgy processes, maintaining ease of production.
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 design allows for easier manufacturing of the valve plate, reduces suction resistance, and enhances the efficiency and reliability of the hermetic compressor by ensuring smooth gas flow and minimizing stress on the suction reed.
Implementation Method 1
The communication pipe outlet includes a communication opening, whose upper shape is a curved protruding shape and whose lower shape is a rectangular shape. An opening of the suction hole at the cylinder side has a non-recessed closed-curve shape, and an opening of the suction hole at the communication pipe side has a shape similar to that of the communication opening of the communication pipe outlet.
Data Source
AI summary
A communication pipe outlet (263) of a suction muffler (26) included in a hermetic compressor (10) includes a communication opening (264). An upper shape (264a) of the communication opening (264) is a curved protruding shape, and a lower shape (264b) of the communication opening (264) is a rectangular shape. A suction hole (33) of a valve plate (30) included in the hermetic compressor (10) is formed such that the cylinder side of the suction hole (33) has a non-recessed closed-curve shape, and the communication pipe side of the suction hole (33) has a shape similar to that of the communication opening (264). The valve plate (30) and a communication pipe (262) are connected in a state where an upper peripheral surface of the communication opening (264) of the communication pipe outlet (263) corresponds to an upper peripheral surface of the suction hole (33).