Reciprocating Compressor Discharge Valve Plate Noise Reduction
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Solution Overview
Problem
Reciprocating compressors, particularly linear compressors, face issues with noise due to collisions between the discharge valve and cylinder, and dead volume leading to reduced cooling power and efficiency due to increased flow passage resistance.
Innovation Solution
A new-type discharge valve assembly is introduced, featuring a valve plate with differently shaped inlets and outlets, a discharge valve with flaps, and a valve stopper to manage the movement of flaps, reducing noise and dead volume by optimizing the discharge process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge valve is used to open and close the cylinder, then refrigerant discharge is controlled, but noise increases due to collision between the discharge valve and cylinder
Solution Approach 1:
A valve plate is introduced as an intermediary component between the discharge valve and the cylinder. The valve plate includes a discharge hole through which refrigerant flows, and the discharge valve opens and closes this hole without directly contacting the cylinder. This mediator structure allows the discharge valve to control refrigerant flow while preventing direct collision with the cylinder, thereby reducing noise.
2Stability of the object's composition
If the piston moves rearward creating dead volume, then refrigerant expansion occurs, but suction is delayed and cooling power decreases
Solution Approach 1:
The invention extracts or removes the harmful dead volume effect by providing a communication passage that connects the compression space to the suction space through the valve plate. This allows refrigerant to be continuously supplied to the compression space even when the piston moves rearward, effectively taking out the delay caused by dead volume and preventing suction delay.
3Volume of moving object
If the discharge hole area is narrow, then discharge valve size is reduced, but flow passage resistance increases and efficiency deteriorates
Solution Approach 1:
The invention changes the dimensional configuration of the discharge hole by providing it with a specific shape that includes an inlet portion and an outlet portion with different cross-sectional areas. The inlet portion has a larger area to reduce flow resistance, while the outlet portion is optimized for valve operation. This dimensional optimization allows the discharge hole to maintain low flow resistance without requiring an overall increase in discharge valve size.
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 minimizes noise and dead volume, enhancing the compressor's efficiency and cooling power by reducing flow passage resistance and improving the discharge process.
Implementation Method 1
a discharge valve located at the outlet and configured to open and close the discharge hole, and the discharge valve may include a plurality of flaps corresponding to the plurality of discharge ports
Implementation Method 2
The permanent magnet may linearly reciprocate between the inner stator and the outer stator by electromagnetic force
Implementation Method 3
the piston linearly reciprocates inside a cylinder by a linear motor in a closed shell to suction refrigerant into a compression space, compress the refrigerant, and then discharge the refrigerant
Implementation Method 4
a muffler that includes a discharge spring configured to support the discharge valve
Data Source
AI summary
A reciprocating compressor includes a cylinder that defines an inner space, a piston that is located in the inner space of the cylinder and that defines a compression space configured to receive refrigerant, a discharge cover that is coupled to a side of the cylinder and that defines a discharge space configured to receive refrigerant discharged from the compression space, and a valve plate that is located at a side space defined at the side of the cylinder and that partitions the side space into the compression space and the discharge space. The valve plate defines a discharge hole through which the compression space and the discharge space communicate with each other, in which the discharge hole includes an inlet that faces the compression space and an outlet that faces the discharge space. The inlet and the outlet have different shapes.