Pressure Switch Flow Path Design for Grease Hardening
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Solution Overview
Problem
Existing pressure measuring elements in lubrication systems suffer from a 'dead space' where lubricant grease does not circulate, leading to aging and hardening, which impairs the element's functionality.
Innovation Solution
A cylindrical pressure-sensing element with a constant diameter is integrated into the housing, extending into the flow path and deflectable by a spring element, ensuring continuous fluid flow and preventing dead spaces from forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional pressure measuring element design is used with connection fittings and T-pieces, then the device can be installed and connected, but dead spaces are created where grease accumulates and hardens
Solution Approach 1:
The housing is segmented into distinct functional zones: a flow path section through which grease continuously flows, and connection fitting sections that are isolated from the flow path. This segmentation allows connection fittings to be present without creating dead spaces in the measurement area, as the grease flow path is separated from the connection areas.
Solution Approach 2:
An intermediary structure (the housing design with integrated flow path) mediates between the connection fittings and the pressure measurement area. The flow path is designed to bypass connection fittings, using intermediate passages that allow grease to flow continuously through the measurement area without stagnating in connection zones.
2Ease of operation
If grease is used as lubricant, then lubrication function is provided, but grease hardens over time in dead spaces causing functionality loss
Solution Approach 1:
The flow path is designed to ensure continuous circulation of grease through the pressure measurement area. The grease flows continuously from the inlet through the flow path past the pressure-receiving element to the outlet, preventing stagnation and hardening in the measurement zone while maintaining lubrication function.
Solution Approach 2:
Different parts of the device have different grease flow characteristics: the flow path area has continuous high-velocity flow preventing hardening, while connection fitting areas may have stagnant grease. This local differentiation allows the measurement area to remain functional while connection areas handle grease storage.
3Measurement precision
If pressure-receiving element is placed in dead space, then pressure measurement is possible, but grease hardening occurs impairing element function
Solution Approach 1:
The pressure-receiving element is extracted from any dead space environment and placed exclusively in the continuous flow path. The element is positioned where grease flows continuously, removing it from stagnant zones where hardening would occur, while still enabling accurate pressure measurement.
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 prevents fluid accumulation and hardening, ensuring reliable operation across various pressure ranges and temperatures, including low temperatures where grease hardening is a concern.
Implementation Method 1
the pressure-receiving element being arranged such that it can be deflected against the pressure of a spring element, and the pressure in the flow path being determined from said deflection of the pressure-receiving element against the pressure of the spring element
Implementation Method 2
the pressure-receiving element being arranged such that it can be deflected against the pressure of a spring element
Data Source
AI summary
The invention relates to a pressure switch (1) comprising a housing (2) having a cavity (3) for receiving a fluid whose pressure is to be measured, wherein the pressure switch (1) further comprises a pressure-sensing element (4) for measuring the pressure, which is in fluidic communication with the cavity (3). In order to prevent impairment of the function of the pressure switch by hardening fluid, the invention provides that the cavity (3) extends from an inlet (5) to an outlet (6) and forms a flow path (7) for the fluid, wherein the pressure-sensing element (4) is arranged between the inlet (5) and the outlet (6) in the flow path (7).