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The problem of excessive temperature in acid-resistant ceramic vacuum pumps has long plagued manufacturers and users; operating in such high temperatures significantly reduces the service life of these vacuum pumps. What are the reasons for the excessive temperature of vacuum pumps, and how can these issues be resolved? Only by addressing the root cause can the problem of excessive temperature in vacuum pumps be effectively solved. The root cause: 1. If the motor power is too high and the operating current is excessive, it will cause the temperature of the acid-resistant ceramic vacuum pump to rise. 2. The number of fan blades is insufficient, resulting in inadequate airflow and an increase in the temperature of the acid-resistant ceramic vacuum pump. 3. The fan speed is too low, resulting in insufficient air pressure and airflow. 4. The bus voltage to which the motor of the acid-resistant ceramic vacuum pump is connected is 380V; due to cable voltage drops and uneven load distribution, the actual voltage applied to the motor is only 365V. This lower voltage results in a higher operating current. 5. There is too much dust inside the motor, and oil stains and dirt are also among the factors that cause the temperature of the acid-resistant ceramic vacuum pump to rise. Appropriate solution: The motor power and speed must match those of the vacuum pump and cannot be changed. The fan is mounted on the motor shaft; the speed of the motor determines the speed of the fan, and it cannot be replaced. Increasing the number of fan blades can help to some extent, but with more blades, it becomes harder to achieve dynamic balance; if alignment is not proper, it can lead to increased vibration in the motor. 1. Extend the original vacuum pump fan cover by 40 cm, and install an axial flow fan with the same diameter as the fan cover inside; the motor of this axial flow fan has a power of 850 W, a rotation speed of 1489 r/min, and operates at a voltage of 380 V. The original fan remains in place. The axial flow fan is equipped with a separate power supply for control, and there is no interlock between the axial flow fan and the main motor. 2. Start the axial flow fan promptly once the vacuum pump begins to operate, and shut it down 30 minutes after the vacuum pump stops, so that the main motor can cool properly. 2. Regularly remove dust from the motor of the acid-resistant ceramic vacuum pump, keep the motor’s cooling fins clean, and thereby improve its heat dissipation capacity. 3. Adjust the voltage of the bus bar to which the acid-resistant ceramic vacuum pump is connected to 400V. Solution to the problem: 1. Due to the high speed of the axial flow fan, which results in high wind pressure and volume, the cooling effect is **enhanced; under the same ambient temperature and load current, the temperature of the main motor of the acid-resistant ceramic vacuum pump decreased by 12°C. The temperature of the main motor during summer has not exceeded the limits again. 2. It slows down the insulation aging of the main motor, extending its service life. 3. The axial flow fan can be controlled manually; even after the main motor stops operating, the axial flow fan can continue to run, thereby ensuring adequate cooling of the main motor. 4. After voltage adjustment, the operating current of the diaphragm pump dropped to 210A, resulting in a relatively reduced amount of heat generation. 5. Try to keep the load distribution between the two busbars balanced, to prevent excessive voltage drop in any one busbar due to excessive load. Through research on the high-temperature issue in acid-resistant ceramic vacuum pumps, we found that the high temperature in these pumps is mainly caused by heat generation in the motor; therefore, the main approaches to solving this problem also focus on the motor of the vacuum pump.