blast drying ovenIt is mainly divided into electric blast drying oven, drying oven, electric constant temperature blast drying oven, desktop blast drying oven, vertical blast drying oven, high-temperature blast drying oven and other blast drying ovens. It is mainly used to dry samples and can also provide the temperature environment required for experiments. The application of electric blast drying oven is in various industries such as chemical, electronics, casting, automotive, food, machinery, etc Generally divided into galvanized steel plate and stainless steel liner, pointer and digital display, natural convection and air circulation, conventional oven and vacuum type, most of which have good technical indicators at temperatures below 300 degrees. There are also more and more drying ovens at 400 degrees Celsius.

After taking a series of improvement measures for drying ovens above 400 degrees, there has been a significant improvement in temperature uniformity. The industry standard stipulates that the temperature uniformity index of this product is ± 2.5% temperature, and the following measures have been taken:

1. Determine the location of the heater:

Whether the heat emitted by the heater can be evenly carried into the working chamber by the airflow is the key to ensuring the temperature uniformity inside the box working chamber. Therefore, determining the location of the heater is extremely important. After multiple repeated experiments, we finally determined the ideal position of the heater, which effectively improved the technical indicators inside the box.

2. The airflow organization structure of the blast drying oven:

The temperature uniformity index of the drying oven depends on the airflow organization structure. Usually, a single duct structure is used to organize the airflow, which mainly comes from the centrifugal fan system. In the structure, the design of the centrifugal machine casing and the design of the air guide plate are the key factors determining the indicators. In addition, improvements have been made to the air outlet and return outlet of the air guide plate, increasing the air volume of the return outlet as much as possible, and increasing the air pressure and speed of the outlet, so that the airflow can circulate evenly in the working room.

3. Locking device for drying oven door:

Drying ovens with temperatures of 400 degrees Celsius or higher can cause significant deformation of materials due to high temperatures. In the past, the door of a high-temperature drying oven was locked with a single point. However, at temperatures above 400 degrees Celsius, the deformation of the door resulted in poor sealing between the door and the box, causing the door to leak heat. The temperature inside the box's working chamber near the door was too low, affecting the uniformity index inside the box. So the problem was solved by changing the gate to double point locking. Improvement of temperature uniformity index for drying ovens at 400 degrees Celsius and above.

4. Drying oven sample shelf:

The single duct airflow structure dictates that the airflow must pass through the sample shelf. A typical drying oven has two layers of shelves, and in the past, the shelves were punched and bent from sheet metal. But in order to ensure its strength, the aperture density of the shelf cannot be too high, which leads to excessive resistance to airflow circulation and affects the uniformity of temperature from the surface. We changed the shelf to a steel wire structure, which effectively solved this problem.