Vacuum Gauge Zoning and Valve Core Tool for Leak-Free Refrigeration Service
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Solution Overview
Problem
Existing vacuum gauges for refrigeration systems are unreliable due to frequent numeric fluctuations, especially in imperfect conditions, and traditional tools for handling valve cores are cumbersome and prone to leaks.
Innovation Solution
A vacuum gauge with distinct pressure zones (safe, working, leak, and non-working) and a service tool with an isolation valve and shaft assembly for efficient valve core removal and pressure sensing, reducing the likelihood of leaks and improving readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a digital vacuum gauge is used, then the numeric output is easy to read, but the reading fluctuates frequently making it frustrating to obtain a stable reading
Solution Approach 1:
The scale is segmented into distinct pressure zones (safe zone, working zone, leak zone, non-working zone) with different color codings. This segmentation allows the technician to quickly identify the system state without being distracted by numeric fluctuations, as the zone indication remains stable and clear.
Solution Approach 2:
Different pressure zones are indicated by different color codings (e.g., green for safe zone, yellow for leak zone, blue for working zone). This color-coding system provides immediate visual feedback that is easy to read and interpret, overcoming the fluctuation issue by focusing attention on the zone category rather than precise numeric values.
2Ease of operation
If traditional valve core removal tools are used, then the tools can remove valve cores, but they are cumbersome and prone to leaks
Solution Approach 1:
The vacuum gauge is merged with valve core removal tools to create an integrated service tool. This combination ensures that the vacuum connection and valve core removal functions work together seamlessly, eliminating the need for separate tools and reducing the risk of leaks by maintaining a unified sealed system.
Solution Approach 2:
The service tool is designed with multi-functionality, combining vacuum gauge functionality with valve core removal capabilities. This universal tool can perform multiple tasks (pressure sensing, vacuum measurement, valve core removal and installation) without requiring tool changes or additional connections, thereby reducing leak risks and improving operational efficiency.
3Measurement precision
If a vacuum gauge with multiple pressure zones is used, then leak detection and safe charging indication are improved, but the device complexity increases
Solution Approach 1:
Different pressure zones are indicated by different color codings on the scale. This visual differentiation provides precise pressure zone indication without requiring complex electronic displays or additional components. The color-coded scale is simple to manufacture and understand, maintaining low device complexity while improving measurement precision.
Solution Approach 2:
The pressure scale is segmented into distinct zones with clear boundaries and color codings. This segmentation provides precise leak detection and safe charging indication by dividing the pressure range into meaningful categories, while the segmented design can be implemented using simple printing techniques on the gauge face, avoiding increased device complexity.
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 provides a reliable and efficient method for servicing refrigeration systems by clearly indicating safe charging pressures and detecting leaks, while the integrated tool ensures secure and leak-free valve core handling.
Implementation Method 1
a pressure sensing mechanism and housing having a pressure sensing port accessible for fluid connection to the refrigeration system to receive fluid for sensing, the pressure sensing mechanism and housing sensing pressure at the pressure sensing port and causing the indicator to move in accordance with sensed pressure at the pressure sensing port
Data Source
AI summary
A vacuum gauge has a scale having a safe zone indicia, a working zone indicia, an indicator to indicate a particular location on the scale, and a pressure sensing mechanism and housing having a pressure sensing port accessible for fluid connection to the refrigeration system to receive fluid for sensing. The indicia are distinctly coded for user differentiation. The scale may include a leak indicating zone indicia and a non-working zone indicia The safe zone indicia may represent 0 to 500 microns, the working zone indicia 500 to 2000 microns, the leak indicating zone indicia 2000 to 25,400 microns, and the non-working zone indicia 25,400 to 30,000 microns. Service tool combination includes body assembly, shaft assembly and gauge in direct sealed connection with a fitting for releasable sealed fluid connection. There are methods using the combination. Tool has gripper with cavity to receive valve core pin. Gripper has base to prevent pin from pulling gripper from tool.