Oil Diffusion Pump Heater Control for Vacuum Speed and Oil Conservation
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Solution Overview
Problem
Existing centrifuges take a long time to reach an ultrahigh degree of vacuum due to inefficient oil diffusion pump operation, leading to increased oil consumption and elevated temperatures at the air outlet, which affects work efficiency and requires frequent oil supply maintenance.
Innovation Solution
A control method for the oil diffusion pump that adjusts the target set temperature from a higher initial temperature to a lower temperature after a given period, stabilizing the heater temperature and reducing oil consumption, allowing the rotation chamber to reach an ultrahigh degree of vacuum in a shorter time while preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the heater temperature is continuously controlled at a high target set temperature to rapidly evaporate oil in the oil diffusion pump, then the rotation chamber can reach an ultrahigh degree of vacuum faster, but the oil consumption increases and the air outlet temperature rises
Solution Approach 1:
The patent applies dynamics by making the target set temperature adjustable rather than fixed. The control unit dynamically changes the target set temperature based on the operational phase: using a higher temperature during initial startup to rapidly achieve vacuum, then switching to a lower temperature during steady-state operation to reduce oil consumption. This dynamic adjustment resolves the contradiction between fast vacuum achievement and oil conservation.
Solution Approach 2:
The patent implements periodic action through the control unit that periodically adjusts the target set temperature. The system alternates between high-temperature phases for rapid vacuum establishment and low-temperature phases for sustained operation with reduced oil consumption. This periodic switching allows the system to optimize performance at different operational stages.
2Loss of time
If the heater temperature is continuously controlled at a high target set temperature to rapidly evaporate oil, then the vacuum is achieved faster, but the air outlet temperature becomes excessively high
Solution Approach 1:
The control unit dynamically adjusts the target set temperature based on operational requirements. During startup, a higher temperature is used to rapidly establish vacuum. During steady-state operation, the target set temperature is reduced to maintain air outlet temperature within acceptable ranges. This dynamic control resolves the contradiction between fast vacuum achievement and temperature management.
Solution Approach 2:
The patent changes the operational parameter (target set temperature) based on the operational phase. By switching from a high target set temperature during startup to a lower target set temperature during steady-state operation, the system achieves both rapid vacuum establishment and temperature control, preventing excessive air outlet temperatures.
3Loss of substance
If the target set temperature is changed from high to low after a given period, then oil consumption is reduced and temperature is stabilized, but the vacuum establishment time is extended
Solution Approach 1:
The patent applies preliminary action by using a high target set temperature during the initial startup phase to rapidly establish vacuum before switching to a lower temperature. This preliminary high-temperature operation ensures that the ultrahigh vacuum is achieved quickly, and then the system transitions to energy-saving operation. The control unit determines the optimal switching timing based on the actual vacuum achievement status.
Solution Approach 2:
The control unit dynamically adjusts the target set temperature based on the operational phase and actual vacuum status. The system transitions from high-temperature operation during startup to low-temperature operation during steady-state, optimizing both vacuum establishment speed and oil consumption. This dynamic control resolves the contradiction by adapting the parameter to the current operational needs.
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 approach enables the rotation chamber to achieve and maintain an ultrahigh degree of vacuum more quickly and stably, reducing oil consumption and preventing temperature fluctuations at the air outlet, thereby improving work efficiency and extending the lifespan of vacuum hoses.
Implementation Method 1
a boiler for heating the stored oil, a heater for heating the boiler
Implementation Method 2
a cooling part which cools and liquefies the high-speed oil molecules ejected from the jet part and colliding against the wall thereof
Implementation Method 3
an oil diffusion pump reducing the pressure from the high degree of vacuum to an ultrahigh degree of vacuum
Data Source
AI summary
A centrifuge comprises a rotor for holding a sample, a rotation chamber for housing the rotor, a motor for rotating the rotor, an oil diffusion pump for reducing a pressure within the rotation chamber, and a control unit for controlling the heater temperature of the oil diffusion pump for a target set temperature. The control unit changes the target set temperature from a first given temperature to a second given temperature that is lower than the first given temperature after a given period of time elapses since the start of control of the heater temperature.