Mixing Valve Inlet Obstruction Against Cross-Flow Sensor Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mixing valves used in heating and cooling systems, the temperature measurement at one inlet can be influenced by flow from the other inlet, leading to inaccurate readings due to fluid flow interference.
Innovation Solution
A mixing valve design with an obstruction inside the second inlet port, positioned to deflect fluid flow from the first inlet, preventing it from entering in the opposite direction and thus minimizing interference with temperature sensors, allowing for precise temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are placed in the inlet ports to measure temperature, then temperature control can be achieved, but flow from one inlet can enter another inlet and influence the temperature detection accuracy
Solution Approach 1:
An obstruction element is introduced as an intermediary component in the second inlet port to block the harmful flow from the first inlet. This obstruction acts as a mediator that prevents the temperature-disturbing flow from reaching the temperature sensor, thereby protecting the measurement accuracy without affecting the normal mixing function of the valve.
Solution Approach 2:
The harmful flow path is extracted or removed from the system by placing an obstruction that blocks the unwanted flow from one inlet entering another inlet. This extraction of the harmful flow component allows the temperature sensors to measure accurately without interference, while the useful mixing function remains intact.
2Measurement precision
If flow from one inlet enters another inlet, then mixing occurs, but this influences the temperature detection and reduces measurement precision
Solution Approach 1:
The obstruction element serves as a mediator that selectively blocks the harmful cross-flow while allowing the normal operational flow to pass through. This enables reliable temperature measurement by the sensor, which is essential for reliable temperature control in the mixing valve system.
Data Source
AI summary
A mixing valve having a first inlet port (4), a second inlet port (6) extending transverse to said first inlet port (4) and an outlet port (8). The inlet ports (4, 6) open out into a valve chamber (10) and the outlet port (8) branches off this valve chamber (10), inside which a movable valve element (12) is arranged, having an obstruction (32) inside the second inlet port (6), which protrudes from an inner circumference (36) of the second port (6) into an interior thereof. The obstruction (32) extends at least along a portion of the inner circumference (36), which portion of the circumference (36) is located on an inner side of the second inlet port (6) being distant from the first inlet port (4). A heating or cooling device includes such a mixing valve.