Door Actuator Thermal Oil Drainage for Fire-Safe Operation
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Solution Overview
Problem
Conventional door actuators pose a fire safety risk due to the use of flammable fluids, which can contribute to the acceleration of fires at high temperatures, particularly when hydraulic oils leak and come into contact with hot surfaces.
Innovation Solution
A temperature safety concept is implemented in the door actuator, where a thermally activatable valve allows hydraulic oil to escape from the fluid housing at high temperatures (approximately 115°C), guiding it away from the hot mounting surface through a defined outflow and collecting device, ensuring it drips to the ground rather than the door leaf, thus preventing ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic fluid is used in the door actuator for force transmission and dampening, then the door actuator can effectively perform opening/closing movements and dampening functions, but the fluid can become flammable and contribute to fire acceleration at high temperatures
Solution Approach 1:
A thermal release valve is pre-configured in the fluid housing that automatically opens at a predetermined temperature (approximately 115°C). This preliminary safety mechanism ensures that before the fluid can reach temperatures that would cause ignition or fire acceleration, the valve activates to drain the fluid away from hot surfaces, preventing the harmful effect before it can occur.
Solution Approach 2:
The harmful hydraulic fluid is extracted from the potential fire hazard zone by routing it through a thermal release valve that discharges the fluid away from hot door surfaces. The drainage path is designed to direct fluid away from mounting surfaces and toward safe discharge locations, removing the flammable substance from the dangerous thermal environment.
2Object-affected harmful factors
If a thermal release valve is added to drain fluid at high temperatures, then fire safety is improved by preventing fluid ignition, but the device complexity increases
Solution Approach 1:
The thermal release valve is integrated directly into the fluid housing structure, combining the safety function with the existing housing rather than adding a separate external component. The valve utilizes the housing walls and integrated drainage pathways, merging multiple functions into a unified structure that minimizes additional complexity.
Solution Approach 2:
The thermal release valve is designed to activate automatically based on temperature conditions without requiring external control systems, sensors, or power sources. The valve self-regulates fluid drainage based on thermal conditions, providing a passive safety mechanism that reduces complexity compared to active controlled systems.
3Object-affected harmful factors
If the drainage path directs fluid away from the mounting surface, then the risk of fluid ignition on hot surfaces is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The drainage path is segmented into distinct functional zones: a collection area within the fluid housing, a controlled discharge path through the thermal release valve, and a final discharge location away from mounting surfaces. This segmentation allows each zone to be optimized independently, reducing the precision requirements for the entire system while ensuring fluid is directed away from hot surfaces.
Solution Approach 2:
The drainage system utilizes three-dimensional spatial arrangement to direct fluid away from mounting surfaces. By designing the drainage path in multiple dimensions within the housing volume and using angled discharge paths, the system achieves effective fluid redirection without requiring extremely precise planar alignment, reducing manufacturing complexity.
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 solution effectively prevents the door actuator from contributing to fire acceleration by safely draining hydraulic oil away from the hot mounting surface, reducing the risk of fluid ignition and ensuring safe operation during a fire.
Implementation Method 1
At correspondingly high temperature, in particular approx. 115° C., the fluid of the door actuator should escape from the inside of the fluid housing of the door actuator in a defined manner
Implementation Method 2
Forces inside the fluid housing are transmitted with the fluid, in particular in order to perform the opening and/or closing movement of the door and/or to dampen a movement of the door
Implementation Method 3
The defined outflow and clever guiding can guide the fluid away from the hot mounting surface, namely in particular from the door leaf, in order to drip to the ground as far as possible away from the hot mounting surface
Data Source
AI summary
A door actuator for opening and/or closing a door, includes a fluid housing with an inner compartment, which is filled with fluid, in particular hydraulic oil, a fluid housing opening in the fluid housing for draining the fluid at thermal overload, a thermally activatable valve for opening, which closes the fluid housing opening, and a collecting device, which is disposed outside the fluid housing opposite the fluid housing opening, forms a collecting space for the fluid, is open towards the fluid housing opening, and includes at least one drain opening for draining the fluid from the collecting space.