Electronic Expansion Valve Connector Assembly for Short-Circuit Isolation
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Solution Overview
Problem
Conventional electronic expansion valves face issues with short circuits due to closely spaced terminals striking against each other, and there is a risk of refrigerant leakage due to inadequate tightening force in assembly.
Innovation Solution
A connector assembly for the electronic expansion valve featuring an insulation sleeve with spaced mounting positions for terminals, fixed by sintering glass, which prevents terminal contact and includes a protective jacket for enhanced insulation and sealing, connected to the housing via a connector seat for improved reliability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the four contact pins are spaced by a distance of about 4mm to fit in limited mounting space, then the device complexity is reduced, but the terminals tend to strike against each other causing short circuit
Solution Approach 1:
The patent introduces an insulating plate as an intermediary component between the contact pins. The insulating plate not only provides electrical insulation but also serves as a mounting structure that positions the contact pins. This mediator allows the contact pins to be spaced closer (reducing device complexity) while preventing them from striking against each other (maintaining connection reliability).
Solution Approach 2:
The patent uses composite material structure by combining the insulating plate with the connector seat. The insulating plate is integrated into the metal connector seat, creating a composite structure that provides both mechanical support and electrical insulation. This allows compact arrangement of contact pins without risk of short circuit.
2Device complexity
If the cover and housing are assembled via threads to reduce parts, then the device complexity is reduced, but refrigerant leakage risk increases due to insufficient tightening force
Solution Approach 1:
The patent replaces the threaded mechanical connection with a welding connection between the cover and housing. Welding provides a stronger, more reliable seal that eliminates the risk of refrigerant leakage associated with threaded connections, while still reducing the number of parts by eliminating the need for separate fastening components.
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 prevents short circuits and enhances the connection reliability of the electronic expansion valve, ensuring safe and normal operation while reducing the risk of refrigerant leakage.
Implementation Method 1
each of the lead wires 04 is provided with a terminal 05, the terminal 05 is sleeved on a contact pin 06, and the contact pin 06 is fixed to an insulating plate 08 by sintering glass 07
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Disclosed are an electronic expansion valve and a connection assembly therefor. The connection assembly (2) comprises a connection seat (21) connected in a sealing manner to an outer housing (1) of the electronic expansion valve and contact pins (22) used for connecting an external control member. The outer housing (1) has a valve chamber with an in-built electrical motor (3). The connection seat (21) has a sealed chamber (211) communicating with the valve chamber, and an insulation sleeve (23) is sheathed in the sealed chamber (211). The insulation sleeve (23) is provided with mounting stations (231) arranged to correspond to terminals (4) of the electrical motor (3), each mounting station (231) being spaced apart in an insulated manner. The insulation sleeve (23) is also provided with connecting holes (232) for the contact pins (22) to pass through. One end of the contact pin (22) passes through the connecting hole (232) and connects to the terminal (4), and the other end thereof extends out of the sealed chamber (211) to form a connecting end used for connecting to an external control member. The insulation sleeve (23) is provided with a mounting station (231) for each terminal (4), thereby separating each terminal (4), preventing short-circuits caused by contact impact between the terminals (4), enabling safer and more reliable use.