Engine Thermostat Layout for Lower Pressure Loss and Better Sensing
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Solution Overview
Problem
Existing thermostat devices experience pressure loss and reduced temperature sensitivity due to the bypass rod and coil spring being located near the thermo-element, limiting coolant flow and contact area.
Innovation Solution
The thermostat device incorporates a thermo-operating unit and a relief mechanism unit with a fitting member to maintain a constant-distance gap, ensuring separate structures for improved coolant flow and contact with the thermo-element, enhancing temperature sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bypass rod and coil spring are located near the thermo-element to control the bypass valve, then the relief valve function is achieved, but the coolant flow is hindered and pressure loss increases
Solution Approach 1:
The invention extracts the bypass rod and coil spring from the immediate vicinity of the thermo-element by positioning them at the lower end of the thermostat housing. This separation removes the obstruction caused by these components near the thermo-element, allowing coolant to flow freely around the thermo-element without being hindered by the bypass mechanism components, thereby reducing pressure loss while maintaining the relief valve function.
2Ease of operation
If the bypass rod is attached to the lower end portion of the thermo-element to enable axial movement, then the bypass valve control is achieved, but the coolant contact area with the thermo-element is reduced
Solution Approach 1:
The bypass rod is extracted from its attachment to the thermo-element and repositioned to the lower end of the thermostat housing. This allows the thermo-element to be fully surrounded by coolant, maximizing the contact area between the coolant and thermo-element surface, thereby improving temperature sensitivity and response accuracy without compromising the bypass valve control functionality.
3Device complexity
If the bypass rod and coil spring are positioned around the thermo-element to form a compact structure, then the device complexity is reduced, but the coolant flow path is restricted
Solution Approach 1:
The bypass rod and coil spring are taken out from the central region around the thermo-element and repositioned to the lower end of the thermostat housing. This creates a clear, unobstructed flow path for coolant to circulate around the thermo-element, significantly improving coolant flow rate and heat transfer efficiency while maintaining a relatively compact overall device structure through strategic component placement.
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 configuration improves coolant flow and temperature sensitivity by allowing efficient contact with the thermo-element, reducing pressure loss, and optimizing coolant flow paths.
Implementation Method 1
a thermal expansion body (wax) expanding and contracting by sensing a temperature change in the coolant flowing through a flow passage between the engine and the radiator
Implementation Method 2
The bypass valve is elastically retained in a biased state by a coil spring
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
Provided is a thermostat device capable of improving the flow of cooling water and temperature sensing performance. A thermostat device 1 according to the present invention includes: a thermo-operation unit 2 for controlling the flow of cooling water being supplied to an engine through a first passage which passes through a radiator; and a relief mechanism unit 3 for controlling the flow of the cooling water being supplied to the engine through a second passage which does not pass through the radiator. The thermo-operation unit 2 has a thermo-element 6 having a built-in thermal expansion body which expands and contracts in response to the temperature of the cooling water. The thermostat device 1 includes a mounting plate 5 for providing a gap of a fixed interval between the thermo-element 6 and the relief mechanism unit 3. The thermo-operation unit 2 and the relief mechanism unit 3 have separate structures, respectively, and are integrated when mounted by using the mounting plate 5.