Tunnel type microwave equipment suitable for sterilizing powdery material

Abstract

The invention relates to the technical field of microwave sterilizing and drying, and particularly discloses tunnel type microwave equipment suitable for sterilizing a powdery material. The tunnel type microwave equipment comprises an oven body, a conveying system, a microwave heating system and an exhaust system, wherein the oven body is internally provided with a microwave oven cavity; and the conveying system comprises a drive roller, a driven roller, and a conveyer belt that penetrates through the microwave oven cavity. The tunnel type microwave equipment is characterized in that a cover device for preventing evaporation of water is arranged at the upper part of the conveyer belt at a front section of the microwave oven cavity; and a semiclosed space is formed between the cover device and the conveyer belt. As the tunnel type microwave equipment adopts the cover device, the water in the material can be maintained appropriately in a sterilizing stage, and a high-temperature, wet and hot environment required for sterilizing is formed; the improvement of a microwave non-thermal sterilizing effect is facilitated; therefore, the sterilizing effect is improved greatly; and the sterilizing effect on the pollen type powdery material is very significant.

Description

technical field [0001] The invention relates to the technical field of microwave sterilization and drying, in particular to a tunnel-type microwave equipment suitable for sterilization of powdery materials. Background technique [0002] At present, tunnel microwave equipment at home and abroad is basically designed with drying as its main function, not sterilization as the main function. In the field of medicine and food, it is often used as sterilization equipment. However, as tunnel microwave sterilization, there are still the following deficiencies: First, because microwave sterilization requires a high temperature and humid environment, but the tunnel microwave dryer of the prior art is due to the lack of design that causes water to evaporate rapidly during microwave sterilization, and cannot form and maintain favorable conditions. Second, due to the uneven distribution of raw materials on the conveyor belt, the heat accumulation effect on the edge or surface of the mate...

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Problems solved by technology

However, as tunnel microwave sterilization, there are still the following deficiencies: First, because microwave sterilization requires a high temperature and humid environment, but the tunnel microwave dryer of the prior art is due to the lack of design that causes water to evaporate rapidly during microwave sterilization, and cannot form and maintain favorable conditions. Second, due to the uneven distribution of raw materials on the conveyor belt, the heat accumulation effect on the edge or surface of the material is not obvious, which not only affects the sterilization effect, but also makes the moisture content of the dried material uneven, which is difficult to ensure Requirements for sterilization conditions; the third is that the microwave oven cavity of the prior art is connected front and back, which is not convenient for forming an independent sterilization space and drying space, so it is also difficult to control the atmosphere in the furnace by partition to achieve the best process environment; the fourth is the existing technology. The drying oven evenly distributes the microwave generators front and back, and the temperature rises slowly in the front section of the microwave oven cavity, and the sterilization temperature cannot be reached quickly, which relatively reduces the sterilization time and makes it difficult to form the necessary sterilization conditions, resulting in low efficiency of sterilization and drying and waste of energy

The defects of the above-mentioned prior art lead to the poor sterilization effect of the traditional tunnel microwave sterilization dryer for powdery or granular materials with low moisture content, such as the killing of pollen spores, which is more prominent

[0003] It is precisely because of the above-mentioned shortcomings of microwave sterilization and drying ovens that it affects its use in the field of medicine and food. For example, instant noodle seasoning packets and other food materials with low moisture content and high spore content cannot be sterilized by microwaves. Sterilization by radiation containing residues of radioactive substances

However, the high-pressure and high-temperature steam sterilization equipment imported from abroad is more than ten times more expensive than the microwave equipment developed by us, and there are large energy consumption, low production capacity, strict working environment requirements, large space occupation, and many ancillary equipment. , complex operation, high risk of pressure vessels and many other disadvantages

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