Bidirectional Filter Structure to Prevent Refrigerant Throttling
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Solution Overview
Problem
The existing bidirectional filters in heat pump systems face issues with pressure variation of refrigerant, leading to increased flow resistance, potential blockage, and deformation of components, which can cause throttling and frosting, and result in partial failure.
Innovation Solution
Incorporating a protective member with a protective surface opposite to the outer side surface of the outlet blocking piece, which restricts the displacement of the outlet blocking piece and maintains a predetermined distance between the connecting pipe and the filter chamber, ensuring smooth refrigerant flow and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet blocking piece is allowed to move freely under refrigerant pressure, then the control valve can open and close the outlet effectively, but the outlet blocking piece may move excessively under high pressure, reducing the flowing section and causing throttling and frosting
Solution Approach 1:
The protective member is pre-installed in the transitional chamber to counteract the excessive movement of the outlet blocking piece before it can cause throttling and frosting. This preliminary protective structure prevents the harmful effect by limiting the displacement of the outlet blocking piece under high refrigerant pressure.
Solution Approach 2:
The protective member acts as an intermediary element between the outlet blocking piece and the connecting pipe. It mediates the interaction by providing a protective surface that the outlet blocking piece contacts during its movement, thereby preventing direct contact between the outlet blocking piece and the connecting pipe that would cause throttling.
2Ease of operation
If the outlet blocking piece moves under refrigerant pressure, then the control valve operates, but the outlet blocking piece may deform under pressure variation, affecting sealing
Solution Approach 1:
The protective member provides beforehand cushioning for the outlet blocking piece by providing a protective surface that limits its movement. This prior cushioning prevents deformation of the outlet blocking piece under pressure variation, ensuring that the sealing face remains intact and maintains proper sealing performance.
3Device complexity
If no protective structure is added, then the device structure remains simple, but the outlet blocking piece may contact the connecting pipe causing blockage under pressure
Solution Approach 1:
The protective member serves as an intermediary structure between the outlet blocking piece and the connecting pipe. It provides a protective surface that the outlet blocking piece contacts during operation, preventing direct contact between the outlet blocking piece and the connecting pipe that would cause blockage, while adding minimal complexity to the overall device structure.
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
This solution reduces the adverse effects of pressure variation on the bidirectional filter, maintaining efficient refrigerant flow and improving the reliability of the control valve component by preventing deformation and ensuring proper sealing.
Implementation Method 1
The inlet blocking piece 450 is mounted at one end of the spring leaf, and in a free state, the inlet blocking piece 450 hermetically cooperates with the inlet 442 under the action of the spring leaf
Implementation Method 2
a filter core 300 is arranged in the filter chamber 211
Data Source
AI summary
A bidirectional filter and a heat pump system. The bidirectional filter comprises a housing and at least two control value components. The two control value components divide the inner chamber of the housing into a filter chamber and two transitional chambers. The control value component comprises a frame body fixed on an inner wall of the housing, and an outlet blocking piece fitting an outlet of the frame body. The outlet blocking piece is on an outer side of the frame body. The bidirectional filter further comprises a protective member located in the filter chamber and fixed relative to the housing. The protective member is provided with a protective surface opposite to an outer side surface of the outlet blocking piece. When the pressure of a refrigerant in the pipeline is too high, the protective surface of the protective member can limit movement of the outlet blocking piece.