Calculation and Analysis of the Effect of Temperature on Solenoid Valve Drive

Solution 1: Reduce the size of the valve port. When the valve port size do=1.5mm, the valve opening pressure difference at 12o℃ is 1.4MPa: When the valve port size do is reduced to 1mm, the valve opening pressure difference at 120℃ is 3.1MPa, which can meet the valve opening pressure difference requirement of more than 2MPa in the whole temperature range. The calculation results are shown in Figure 5.

Solution 2: Increase the coil drive voltage. When the working voltage U=12V, the valve opening pressure difference at 120℃ is 1.4MPa: When the working voltage U increases to 14V, the valve opening pressure difference at 120℃ is 2.1MPa, which can meet the valve opening pressure difference requirement of more than 2MPa in the whole temperature range, as shown in Figure 6.

When increasing the voltage to increase the valve opening pressure difference, it is best to adapt temperature sensor monitoring and increase the voltage when the temperature reaches a certain range to avoid increasing the voltage throughout the entire stroke, thereby increasing energy consumption.

4 Conclusion

Based on the calculation formulas of magnetomotive force, electromagnetic force, and winding resistivity, this paper analyzes the influence of temperature on the magnetomotive force of the coil, the electromagnetic force of the solenoid valve, and the valve opening pressure difference. Taking the typical room temperature of 20°C and high temperature of 120°C as examples, the magnetomotive force decays by 28%, the electromagnetic force decays by 48%, and the valve opening pressure difference decays by 62%. Although the valve opening pressure difference is adapted and even redundant under room temperature conditions, in order to ensure product reliability, the valve opening pressure difference must be able to reach a standard greater than 2MPa in the full temperature operating range. The valve opening capacity decay caused by temperature rise can be ensured by adapting the appropriate valve port size or increasing the voltage to ensure that the driving capacity meets the standard in the full temperature range.