Liquid Pump Temperature Sensor Layout for Accurate Oil Sensing
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Solution Overview
Problem
Conventional liquid pump devices face challenges in accurately detecting the temperature of hydraulic oil due to heat being dissipated through intervening members, and the assembly of temperature sensors is cumbersome, potentially increasing device size.
Innovation Solution
A liquid pump device design featuring a temperature sensor with a protruding tip region in the discharge passage, allowing direct contact with flowing hydraulic oil, and a configuration that simplifies assembly without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the temperature sensor is mounted on the circuit substrate inside the housing to detect hydraulic oil temperature, then the device structure is compact and assembly is simplified, but heat is discharged to intervening members (housing and heat dissipation member) causing inaccurate temperature detection
Solution Approach 1:
The temperature sensor is extracted from the housing interior and repositioned to protrude into the liquid flow passage. This removes the sensor from the thermal environment of the housing and heat dissipation member, allowing direct contact with the hydraulic oil for accurate temperature measurement without interference from intervening thermal structures.
Solution Approach 2:
The temperature sensor acts as an intermediary element that protrudes into the liquid flow passage, directly contacting the hydraulic oil to measure its temperature. This intermediary positioning eliminates the need for heat to travel through the housing and heat dissipation member, providing accurate temperature data directly from the liquid.
2Measurement precision
If the temperature sensor protrudes into the liquid flow passage for accurate temperature detection, then temperature measurement accuracy is improved, but the device size increases
Solution Approach 1:
Only the tip region of the temperature sensor protrudes into the liquid flow passage, while the main body of the sensor remains integrated with the circuit substrate inside the housing. This localized protrusion minimizes the increase in device volume while achieving accurate temperature detection at the critical measurement point.
Solution Approach 2:
The temperature sensor is merged with the circuit substrate, with the sensor body integrated into the substrate structure and only the tip protruding into the liquid flow passage. This integration eliminates the need for separate mounting structures and minimizes overall device volume while maintaining measurement accuracy.
3Ease of manufacture
If the temperature sensor is integrated with the circuit substrate for easy assembly, then assembly simplicity is improved, but temperature detection accuracy deteriorates due to heat transfer through the substrate
Solution Approach 1:
The temperature sensor is segmented into two functional zones: the main body integrated with the circuit substrate for easy assembly and electrical connection, and the tip region protruding into the liquid flow passage for accurate temperature measurement. This segmentation allows the sensor to benefit from both integration (assembly simplicity) and direct liquid contact (measurement accuracy).
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 temperature sensor accurately detects the temperature of hydraulic oil without heat interference and simplifies assembly, enhancing detection accuracy and reducing overall assembly time.
Implementation Method 1
a temperature sensor having a tip region protruded in the passage, so as to measure a temperature of the liquid flowing on the passage
Data Source
AI summary
A liquid pump device sucking and discharging liquid includes: a pump unit 50, rotating to make the liquid flow; a housing H, accommodating the pump unit and defining a passage 14 of the liquid; and a temperature sensor 80 having a tip region 80a protruded in the passage 14 of the liquid to measure a temperature of the liquid flowing on the passage 14.