Pressure switch assembly having quick connect capillary tube
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Solution Overview
Problem
Conventional pressure switch assemblies in refrigeration systems require labor-intensive and costly replacement processes, often resulting in significant refrigeration fluid leakage, which is hazardous to the environment.
Innovation Solution
A pressure switch assembly with a quick connect capillary tube and automatic shutoff valve, allowing for easy detachment and reattachment without significant fluid leakage, using a ball-lock type quick connect coupling that automatically seals when disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capillary tube is soldered to the refrigeration line for secure connection, then the connection reliability is improved, but the replacement complexity and labor cost increase significantly
Solution Approach 1:
The pressure switch assembly is divided into separable components: the switch body and the capillary tube assembly. The capillary tube is pre-connected to the refrigeration line via a quick-connect coupling that allows tool-free attachment and detachment, while the switch body can be independently replaced. This segmentation enables easy maintenance without requiring soldering operations.
Solution Approach 2:
A quick-connect coupling mechanism serves as an intermediary between the capillary tube and the refrigeration line. This coupling includes a male connector on the capillary tube and a female connector on the refrigeration line, with automatic sealing features that prevent refrigerant leakage during connection and disconnection operations.
2Ease of repair
If the capillary tube is detachably connected for easy replacement, then the ease of repair is improved, but refrigeration fluid leakage increases
Solution Approach 1:
The quick-connect coupling incorporates an automatic shutoff valve as an intermediary component that seals the refrigeration line when the capillary tube is disconnected. This valve prevents refrigerant leakage by closing off the line automatically upon detachment of the capillary tube, eliminating the harmful environmental effect while maintaining easy replaceability.
Solution Approach 2:
The system employs preliminary sealing measures through the quick-connect coupling design, where sealing elements are pre-positioned to immediately prevent refrigerant escape as soon as disconnection begins. The automatic shutoff valve is primed to close instantly upon detachment, counteracting the potential leakage before it can occur.
3Productivity
If the quick connect coupling is used for easy replacement, then the labor cost is reduced, but the device complexity increases
Solution Approach 1:
The coupling mechanism is segmented into simple, standardized components: a male connector with external threading, a female connector with internal threading and an integrated shutoff valve, and a locking mechanism. Each component has a single primary function, reducing overall system complexity while enabling rapid replacement operations.
Solution Approach 2:
The quick-connect coupling incorporates self-actuating features including automatic shutoff valve operation that occurs passively upon detachment, and self-sealing mechanisms that require no manual intervention. The design allows technicians to perform replacements without specialized tools or training, improving productivity while keeping the mechanism straightforward.
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
Enables quick and leak-free replacement of the pressure switch assembly, reducing labor and environmental hazards while maintaining control over refrigeration system components.
Implementation Method 1
A quick connect coupling is designed to couple and decouple the capillary tube and the switch body in order to open and close, respectively, fluid communication between the capillary tube and the switch body, respectively
Implementation Method 2
A shutoff valve is designed to open and close fluid communication between the capillary tube and the quick connect coupling when the quick connect coupling is coupled and decoupled, respectively
Data Source
AI summary
Embodiments of a pressure switch assembly having a quick connect capillary tube are disclosed. One embodiment, among others, has an elongated cylindrical capillary tube for attachment to a refrigeration line so that refrigeration fluid pressure in the refrigeration line can be sensed. A quick connect coupling is connected to the shutoff valve. A shutoff valve is designed to open and close fluid communication between the capillary tube and the quick connect coupling when the quick connect coupling is coupled and decoupled, respectively. A switch body is connected to the quick connect coupling and has first and second electrical connections. The switch body has an internal on/off switch designed to electrically connect and electrically disconnect the first and second electrical connections based upon a predetermined set point of pressure associated with refrigeration fluid that is in communication with the switch body.