Pilot Valve Structure for Weld-Free Four-Way Reversing Valve Assembly
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Solution Overview
Problem
Existing four-way reversing valve technologies face challenges with inconvenient assembly due to the separate arrangement and welding of end covers, leading to high production costs and potential leakage risks.
Innovation Solution
The design integrates a pilot valve with a housing, catheter assembly, and control assembly, featuring a mounting hole with a support portion and a filter screen, which allows for automatic assembly and improved connection strength, eliminating the need for an end cover and reducing the risk of leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end cover is arranged separately and connected by welding, then the valve body structure is complete, but the assembly is inconvenient and production cost is high
Solution Approach 1:
The mounting hole is integrated directly into the valve body structure, eliminating the need for a separate end cover component. This merging of functions allows the air exhaust pipe to be inserted directly into the valve body through the mounting hole, removing the welding step while maintaining structural integrity and connection reliability.
Solution Approach 2:
The end cover component is extracted/removed from the valve assembly. By taking out the unnecessary end cover and integrating its function directly into the valve body mounting hole, the design simplifies the assembly process and eliminates welding operations while preserving the sealing and structural functions.
2Ease of manufacture
If the air exhaust pipe is inserted into the housing through the mounting hole, then automatic assembly is convenient, but the connection strength may be insufficient
Solution Approach 1:
The support portion is pre-formed as an integral structure on the valve body, extending from the mounting hole toward the inside of the housing. This preliminary structural preparation provides a ready-made support and positioning feature that guides the air exhaust pipe during insertion, ensuring proper alignment and secure connection before final assembly.
Solution Approach 2:
The support portion creates a localized structural feature with different geometry than the main valve body. This local quality change provides enhanced support, positioning, and connection strength specifically at the air exhaust pipe mounting location, while the rest of the valve body maintains its original design.
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 simplifies the structure, reduces production costs, and enhances assembly convenience while preventing slider displacement and airflow-induced issues, thereby improving the reliability and efficiency of the valve system.
Implementation Method 1
an inside of the air exhaust pipe is provided with a filter screen
Implementation Method 2
an elastic piece connected with the top block, a magnetic attraction piece connected with the elastic piece
Implementation Method 3
a magnetic attraction piece connected with the elastic piece, a connecting rod connected with the magnetic attraction piece
Data Source
AI summary
The present disclosure provides a pilot valve and a four-way reversing valve. The pilot valve includes: a valve body, wherein the valve body is a cylinder formed by integrally stretching and having an open end and a closed end, the closed end is defined as a first end, the open end is defined as a second end, the first end of the valve body is provided with an inlet, the valve body is internally provided with a cavity, and the inlet is in communication with the cavity; an inlet pipe, connected with the first end of the valve body, wherein a pipe opening of the inlet pipe is in communication with the inlet; and a limiting structure arranged between the first end of the valve body and the inlet pipe, the limiting structure is used for limiting a relative position of the inlet pipe relative to the valve body.