Thermostat Flow Rectification Around Bosses to Cut Pressure Loss
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Solution Overview
Problem
Conventional thermostat devices experience increased flow resistance and pressure loss due to a protruding boss within the device housing, leading to turbulence, design constraints, and molding defects, which hinder smooth coolant flow and compact device design.
Innovation Solution
A thermostat device with a rectifying wall on the outer peripheral surface of the boss, tapered to guide coolant flow smoothly, and a rib on the opposite side to prevent axial misalignment and sealing issues, minimizing pressure loss and molding defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical boss protrudes into the device housing to secure the piston, then the piston can be firmly mounted, but the boss causes turbulence and increases flow resistance leading to large pressure loss
Solution Approach 1:
The boss structure is segmented into multiple functional zones: a reduced-diameter section to minimize flow obstruction, a tapered section to gradually guide flow, and a sealing section. This segmentation allows the boss to maintain its structural function while reducing turbulence and pressure loss in the coolant flow path.
Solution Approach 2:
The boss design incorporates axial and radial dimensional variations, including a reduced-diameter portion and tapered sections, to create a three-dimensional flow guidance structure. This dimensional approach allows the boss to serve both mounting and flow rectification functions simultaneously.
2Reliability
If the boss protrudes into the device housing, then the piston can be secured, but the device size increases and compactness is reduced
Solution Approach 1:
The boss structure is nested within the device housing with its reduced-diameter and tapered portions fitting into the housing cavity. This nesting approach allows the boss to perform its securing function while minimizing the overall device volume and maintaining compactness.
3Reliability
If the boss protrudes into the device housing, then the piston can be mounted, but the piston shakes due to direct fluid pressure causing improper sealing
Solution Approach 1:
The reduced-diameter and tapered portions of the boss act as an intermediary flow guidance structure between the coolant flow and the piston. This intermediary design redirects the flow to avoid direct pressure on the piston, preventing piston shaking and ensuring proper valve sealing while maintaining secure piston mounting.
4Device complexity
If the boss is positioned in the resin flow path during molding, then the structure can be simplified, but the resin becomes weakened at the collision point
Solution Approach 1:
The boss design incorporates a reduced-diameter section and tapered portions that create a gradual flow path for resin during molding. This local geometric modification prevents resin collision and weakening at specific points while maintaining overall structural simplicity and integration of the boss into the housing.
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 rectifying wall and rib configuration reduces turbulence and pressure loss, ensures smooth coolant flow, and maintains a compact device design while preventing molding defects and sealing issues, enhancing the operational efficiency of the thermostat device.
Implementation Method 1
coolant flowing from the radiator side collides with the boss protruding into the interior of the device housing, causing turbulence that increases the flow resistance
Implementation Method 2
turbulence that increases the flow resistance in the thermostat device and leading to a large loss of pressure
Data Source
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AI summary
Problem To Be Solved: To obtain a thermostat device capable of reducing a loss of pressure in a fluid passage by promoting a smooth flow of a fluid flowing into the interior of a device housing and exhibiting a rectifying effect. Solution to the Problem: A thermostat device provided with a cylindrical boss 20 protruding into a flow of fluid flowing in from a fluid inlet 12 inside a device housing 11 from a direction obstructing the flow of fluid, characterized in that a rectifying wall 30 in the shape of a thin plate that protrudes toward an upstream side of the flow of fluid from the boss is provided as a rectifying means. The rectifying wall is formed in the shape of a plate that gradually increases in thickness from the fluid inlet side toward the boss. The leading edge along a direction of the flow of fluid is formed to have a tapered shape inclined from the tip of the boss toward the base of the boss. A side of the boss opposite the side facing the fluid inlet is provided with a rib 31.