Electronic Expansion Valve Assembly With Fewer Sealed Joints
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Solution Overview
Problem
The existing electronic expansion valves have a high leakage probability due to multiple sealed parts and a complex assembly structure, which complicates the manufacturing and assembly process.
Innovation Solution
The design reduces the number of sealed parts by integrating the gear seat within the valve cavity and connecting the upper end of the valve seat directly to the lower end of the motor shell, simplifying the assembly structure and reducing leakage probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear seat is hermetically connected to the motor shell and sleeve part via thread engagement, then the assembly structure is complete, but the number of sealed parts increases and leakage probability increases
Solution Approach 1:
The patent merges the gear seat with the valve seat by providing the gear seat inside the valve cavity, eliminating the need for separate hermetic connections between the gear seat and motor shell. This reduces the number of sealed parts from multiple thread engagement joints to fewer critical sealing locations, thereby reducing leakage probability while maintaining structural integrity.
2Stability of the object's composition
If the nut extends from the upper end of the valve rod to limit circumferential rotation, then the circumferential rotation is limited, but the axial dimension of the valve core component increases
Solution Approach 1:
The patent transitions from axial limitation (using a nut extending from the valve rod) to circumferential limitation by providing a limit part inside the gear seat that engages with the valve rod. This dimensional shift allows circumferential rotation limitation without increasing the axial dimension of the valve core component, solving the space constraint problem.
3Ease of manufacture
If the outer diameter of the nut is significantly less than that of the valve rod, then the limit part can be mounted, but the overall valve core component has a large lower portion and small upper portion
Solution Approach 1:
The patent merges the limit part with the gear seat structure, eliminating the need for a separate nut component. This integration creates a uniform valve core component shape without the large lower portion and small upper portion problem, while still achieving the circumferential rotation limitation function through the limit part's engagement with the valve rod.
4Ease of manufacture
If the inner diameter of the head of the sleeve part is less than that of the guiding part, then the limit part can be mounted, but the structure becomes complicated and processing becomes difficult
Solution Approach 1:
The patent extracts the limit part function from the sleeve part structure and relocates it to the gear seat. By providing the limit part inside the gear seat rather than requiring complex modifications to the sleeve part's inner diameter, the design simplifies the overall structure and makes processing easier while still achieving the required circumferential rotation limitation.
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
This design effectively reduces leakage probability and simplifies the assembly process by minimizing the number of sealed parts and streamlining the connection between components, leading to a more reliable and cost-effective electronic expansion valve.
Implementation Method 1
The gear system is transmissively connected to a rod screw (4). An upper end of the gear seat (3) is further hermetically connected to a motor shell (5)1, inside of which a motor (5) is provided. The motor (5) is transmissively connected to the gear system (8) via an output shaft. A slidable valve rod (6) is provided inside the guiding part (2)1. A nut (7) extends from an upper end of the valve rod (6) and is further provided in a limit part (3)1 in a lower cavity of the gear seat (3).
Data Source
AI summary
An electronic expansion valve comprising a screw rod and a motor provided with an output shaft. The output shaft is transmissively connected to the screw rod via a gear system. The gear system is supported on a gear base. The screw rod passes through the gear base. The electronic expansion valve also comprises a valve base provided with valve cavity and a motor housing arranged on the exterior of the motor. The gear base is further arranged within the valve cavity. The upper end part of the valve base is further connected to the lower end part of the motor housing. The structural design of the electronic expansion valve reduces the number of sealed parts for same, thus effectively lowering the probability of leakage and simplifying the assembly structure thereof.