Thrust Control Valve Guide Surface Alignment
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Solution Overview
Problem
In existing thrust control valves, the separation of the plug from the nozzle can lead to axis deviation and non-uniform gaps, causing variations in the injection distribution of propelling gas, affecting the trajectory and posture control of flying objects.
Innovation Solution
A thrust control valve design featuring a valve element with a gas injection passage and a valve stem having a guide surface that maintains contact with the valve element's inner surface, even when separated, ensuring precise positioning and uniform gas injection through V-grooves or through-holes, which can be adjusted for optimal gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the plug is separated from the nozzle at valve opening, then the valve can be opened for gas flow, but the plug position may incline and deviate from the nozzle central axis
Solution Approach 1:
A guide surface is introduced as an intermediary element between the plug and nozzle. This guide surface maintains contact with the plug's outer circumferential surface during valve opening, acting as a mediator that guides the plug's movement and prevents inclination while allowing the valve to open.
Solution Approach 2:
The contact surface between plug and nozzle is segmented into two functional zones: a valve-seating surface for sealing when closed, and a guide surface for positioning during opening. This segmentation allows the plug to maintain proper alignment while enabling full opening motion.
2Productivity
If the plug is separated from the nozzle, then gas can flow through the valve, but the gap between the plug and nozzle becomes non-uniform
Solution Approach 1:
The guide surface serves as an intermediary that maintains uniform spacing between the plug and nozzle during gas flow. By providing a controlled contact surface, it ensures the gap remains consistent while allowing adequate gas passage.
Solution Approach 2:
Different portions of the plug surface have different functions: the valve-seating surface provides sealing contact, while the guide surface provides positioning contact with controlled clearance. This local differentiation ensures both uniform gap and adequate gas flow.
3Ease of operation
If the plug is separated from the nozzle, then the valve opens for propulsion control, but the injection distribution of propelling gas varies
Solution Approach 1:
The guide surface acts as a mediator that maintains proper alignment between plug and nozzle during operation. This consistent alignment ensures uniform propelling gas injection distribution while allowing the valve to open for trajectory and posture control.
Solution Approach 2:
The guide surface establishes proper plug positioning before gas injection begins. By pre-aligning the plug with the nozzle central axis, it ensures consistent injection distribution from the start of valve opening.
Data Source
AI summary
A thrust control valve equipped with: a valve element, in which a gas injection passage, through which an operating gas is injected, is formed, with a valve-seating surface being formed in the gas injection passage; and a valve stem, which is provided in the interior of the gas injection passage and has a seated surface that makes contact with the valve-seating surface. A guide surface which makes contact with the inner circumferential surface of the gas injection passage of the valve element is formed on the outer circumferential surface of the valve stem. The guide surface is formed downstream from the seated surface in the direction of flow of the operating gas. A V-groove through which the operating gas flows is formed at the tip of the valve stem, downstream from the seated surface in which the guide surface is formed.