Stator assembly, electronic expansion valve and refrigeration device

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Solution Overview

Problem

Conventional electronic expansion valves experience discharge issues due to high-voltage pulses, posing safety hazards as magnetic pole teeth do not fully contact the valve body, leading to potential breakdowns.

Innovation Solution

An electronic expansion valve design featuring a housing, coil assembly, and a fixing member that electrically connects the metal shell of the coil assembly to the conducting tube, preventing discharge between magnetic pole teeth and the valve body by ensuring a conductive path for high-voltage pulses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If magnetic pole teeth are used to contact the valve body, then the stator assembly can drive the rotor to rotate, but gaps between magnetic pole teeth and valve body cause discharge during high-voltage pulses

Engineering Contradiction:

Improvedriving capabilityVSAvoidsafety performance

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

A metal shell is introduced as an intermediary component between the coil assembly and the valve body. The metal shell provides a continuous conductive path that bridges the gaps between magnetic pole teeth and valve body, preventing discharge while maintaining the driving function. The fixing member serves as another intermediary to securely connect the metal shell to the conducting tube, ensuring reliable electrical connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The metal shell is installed beforehand to cover the coil assembly and provide electrical shielding before high-voltage pulses occur. This pre-established conductive barrier cushions against potential discharge by providing a safe path for electrical currents, preventing direct discharge between magnetic pole teeth and the valve body housing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Object-affected harmful factors

If the coil assembly is enclosed in the housing, then it is protected, but electrical connection to ground cannot be established

Engineering Contradiction:

Improveprotection from dischargeVSAvoidelectrical grounding

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The fixing member acts as an intermediary component that penetrates the housing structure to establish electrical connection. It connects the enclosed metal shell to the conducting tube that extends to the ground, bridging the isolation created by the housing while maintaining protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical connection path is segmented into multiple parts: the metal shell provides internal shielding, the fixing member provides the connection through the housing, and the conducting tube provides the external ground path. This segmentation allows the housing to remain intact for protection while establishing reliable electrical grounding through separate components.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If magnetic pole teeth directly contact the valve body, then simple structure is achieved, but discharge occurs during high-voltage pulses

Engineering Contradiction:

Improvestructural simplicityVSAvoiddischarge interference

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The metal shell is introduced as a minimal additional component that provides the necessary electrical shielding function. Rather than redesigning the entire magnetic drive system, this intermediary layer is added to the existing coil assembly structure, maintaining simplicity while eliminating discharge harmful effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The metal shell, which adds some structural complexity, converts the potentially harmful discharge phenomenon into a beneficial grounding function. By providing a controlled path for electrical currents, it transforms the risk of discharge interference into a protective electrical shielding mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 reduces discharge occurrences, enhancing the safety performance of the electronic expansion valve by providing a secure electrical connection that grounds high-voltage currents, thus preventing interference and breakdowns.

Implementation Method 1

the fixing member is configured for connecting with the conducting tube of the electronic expansion valve to electrically conduct the metal shell and the conducting tube

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11867439B2Stator assembly, electronic expansion valve and refrigeration device

Publication Date: 2024.01.09 GUANGDONG MEIZHI COMPRESSOR

AI summary

A stator assembly, an electronic expansion valve, and a refrigeration device are provided. The stator assembly has a housing, a coil assembly and a fixing member. An outer surface of the housing is provided with an installation opening. The coil assembly is provided in the housing, and has a shell for mounting a coil. The fixing member is inserted through the installation opening to be fixedly connected with the shell, and the is configured to connect with the conducting tube of the electronic expansion valve to electrically conduct the shell and the conducting tube.