Refrigeration Throttling Valve Stopper for Stable Bleed Flow
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Solution Overview
Problem
Conventional throttling devices in refrigeration cycles risk the needle valve biting the valve port due to the need for a bleed groove, which can lead to valve port clogging and instability in bleed flow rates.
Innovation Solution
A throttling device with a stopper means to maintain a minimum gap between the valve body and valve port, featuring a guide section and biasing means in the primary chamber, where the valve body's end face diameter is smaller than the sliding shaft, and the stopper means covers the biasing means, including a pressure-equalizing path to stabilize valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bleed groove is provided to maintain bleed flow rate in valve close state, then bleed flow rate is maintained, but the needle valve may bite the valve port
Solution Approach 1:
The invention divides the valve body into two functional sections: a needle valve portion for controlling the main valve port, and a separate bleed groove portion for maintaining bleed flow. This segmentation allows the needle valve to be positioned away from the valve port while still achieving the desired bleed flow rate, preventing valve port biting while maintaining reliability.
Solution Approach 2:
The bleed groove acts as an intermediary flow path that provides a dedicated channel for bleed flow, separate from the main valve port. This intermediary structure allows the needle valve to control the main flow without directly interfering with the bleed flow path, eliminating the biting problem while maintaining stable bleed flow rate.
2Reliability
If the valve body is allowed to close fully on the valve seat, then sealing is improved, but the valve port may become clogged by foreign particles
Solution Approach 1:
The invention extracts the bleed flow function from the main valve port by providing a separate bleed groove. This extraction allows the main valve port to be kept open by a minimum gap, preventing foreign particle accumulation and clogging, while the bleed groove handles the sealing function independently.
Solution Approach 2:
The bleed groove is designed to maintain a predetermined minimum gap between the valve body and valve port before the valve closes fully. This preliminary action ensures that the valve port remains slightly open to prevent clogging, while the bleed groove provides the necessary sealing path.
3Productivity
If the valve opening degree is increased from the minimum gap, then flow rate is improved, but valve operation stability may be affected
Solution Approach 1:
The bleed groove maintains continuous bleed flow throughout the valve operation cycle, from the minimum gap position through full opening. This continuous action ensures stable valve operation while allowing the main flow rate to be adjusted by increasing the valve opening degree from the minimum gap position.
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
Prevents the valve body from seating on the valve seat, ensuring a stable bleed flow rate and preventing foreign particle adhesion, while maintaining valve operation stability even with pressure changes.
Implementation Method 1
a coil spring biasing a valve body in a valve close direction against the differential pressure
Implementation Method 2
further including a pressure-equalizing path for communicating a stopper chamber in the stopper means with the primary chamber
Data Source
AI summary
A throttling device is equipped with a valve seat in which a valve port for connecting a primary chamber and a secondary chamber is formed, a needle valve, a needle section which is inserted into the valve port, a guide section for guiding a slide shaft of the needle valve, and a coil spring for biasing the needle valve in a valve-closing direction. The guide section and the coil spring are positioned on the primary chamber side. The position of the needle valve in the valve-closing direction is restricted by a stopper section in a manner such that the minimum gap between the needle valve and the valve port is maintained. Furthermore, the needle valve is not seated on the valve seat.