Method for controlling liquid level in degassing tank of sterilization machine

Abstract

The invention discloses a method for controlling the liquid level in the degassing tank of a sterilization machine. A liquid level sensor is arranged in the degassing tank. A proportional valve used for adjusting feeding quantity is further arranged on the feeding pipe of the degassing tank. The method includes: resetting the actual minimum openness of the proportional valve according to the preset minimum openness of the proportional valve when the liquid level sensor detects that the actual material liquid level in the degassing tank reaches the preset upper limit to allow the actual minimum openness of the proportional valve to be not smaller than the preset minimum openness of the proportional valve; resetting the actual maximum openness of the proportional valve according to the preset maximum openness of the proportional valve when the liquid level sensor detects that the actual material liquid level in the degassing tank reaches the preset lower limit to allow the actual maximum openness of the proportional valve to be not larger than the preset maximum openness of the proportional valve. The method for controlling the liquid level in the degassing tank of the sterilization machine has the advantages that material liquid level fluctuation caused by foam in the degassing tank is effectively avoided by resetting the actual openness of the proportional valve, interference brought by the liquid level fluctuation is eliminated effectively, and the work stability of a degassing system is increased.

Description

technical field [0001] The invention relates to the technical field of beverage production, in particular to a liquid level control method in a degassing tank of a sterilizer. Background technique [0002] In the beverage industry, most sterilizers are equipped with a degassing system, in which the degassing system plays the role of removing bad odor and eliminating soluble air bubbles from the material. During the production process, a large amount of foam will be generated when the material is degassed. When the degassing tank contains foam, the fine foam will increase with the flow of the material, and the liquid level detected by the liquid level sensor will rise; When the liquid inlet proportional valve is detected by the liquid level sensor according to the false liquid level signal, it will be slowly closed to reduce the feed volume, and even the proportional valve will be closed, resulting in the actual liquid inlet volume being less than the liquid outlet volume. ...

AI Technical Summary

Problems solved by technology

During the production process, a large amount of foam will be generated when the material is degassed. When the degassing tank contains foam, the fine foam will increase with the flow of the material, and the liquid level detected by the liquid level sensor will rise; When the liquid inlet proportional valve is detected by the liquid level sensor according to the false liquid level signal, it will be slowly closed to reduce the feed volume, and even the proportional valve will be closed, resulting in the actual liquid inlet volume being less than the liquid outlet volume. , with the delivery of the main pump, the foam in the degassing tank will be pumped out suddenly, causing the liquid level to decrease sharply. At this time, the proportional valve is too late to adjust, which will cause the liquid level in the degassing tank to be too low, and even the infusion pump will stop running. Cause degassing system failure

When the foam in the degassing tank suddenly decreases or disappears, the proportional valve opens rapidly according to the liquid level signal detected by the liquid level sensor to increase the feed volume, so that the feed volume is greater than the liquid output volume, and the proportional valve is too late to adjust , causing the liquid level in the degassing tank to be too high, affecting the degassing effect

However, the currently commonly used sub-level liquid level or PID liquid level control cannot control this liquid level fluctuation phenomenon, which eventually leads to ineffective control of unstable liquid inlet and outlet.