Vacuum drying oven DZF-6400

1、 Product Usage

Vacuum drying oven DZF-6400It is designed specifically for drying heat sensitive, easily decomposable, and oxidizable substances, capable of injecting inert gas into the interior. Its characteristic is that some complex components can also be quickly dried. Aluminum partition mesh, with strong thermal conductivity and lightweight. Easy to operate.

2、 Product Technical Parameters

Power supply: 380V 50HZ

Power: 6KW

Capacity: 400 liters

Vacuum degree: 133PA

Temperature control range: RT+10~200 degrees

Inner container size: 600 * 800 * 800mm

Partition: 1 piece (aluminum partition)

3、 Product images

4、 Packaging

Vacuum drying oven DZF-6400After the test run is completed, wrap it with plastic wrap, fix the four corners with plastic wrap, and then package it in a sturdy wooden box made according to the size and fix it. The bottom wooden support legs are thick and sturdy, making it easy for forklifts to move and transport without tipping over.

5、 After sales

Feiyue's constant temperature box promises a one-year warranty and lifetime service.

principle

1. The reason for the difference between the instrument reading of the vacuum drying oven and the reading of the glass rod thermometer in the vacuum chamber is:

The general electric vacuum drying oven adopts the method of heating the vacuum chamber wall first, and then radiating heating from the wall to the workpiece. In this way, the temperature sensor of the temperature control instrument can be arranged on the outer wall of the vacuum chamber. Sensors can simultaneously receive convection, conduction, and radiation heat. The glass rod thermometer in the vacuum chamber can only accept radiant heat, and because the blackness of the glass rod cannot reach 1, a considerable part of the radiant heat is refracted. Therefore, the temperature value reflected by the glass rod thermometer is definitely lower than the temperature reading of the instrument. Generally speaking, it is normal for the temperature reading of the instrument to differ from the reading of the glass rod thermometer by less than 30 ℃ under the working condition of 200 ℃. If the temperature sensor of the temperature control instrument is arranged in the vacuum chamber, the difference between the temperature value of the glass rod thermometer and the temperature reading of the instrument can be appropriately reduced, but it cannot be eliminated, and the sealing reliability of the vacuum chamber increases a potentially unreliable link. If you don't want to see this difference from a practical operational perspective, you can use the display correction function of the temperature control instrument * to solve it.

2. The reason for first vacuuming and then heating up the vacuum drying oven

1) The purpose of placing the workpiece in a vacuum box for vacuuming is to remove any gas components that can be extracted from the material of the workpiece. If the workpiece is heated first, the gas will expand when exposed to heat. Due to the excellent sealing of the vacuum box, the enormous pressure generated by the expanding gas may cause the tempered glass of the observation window to burst. This is a potential danger. By following the procedure of vacuuming first and then heating up, this danger can be avoided.

2) If the procedure of heating up first and then vacuuming is followed, when the heated air is pumped out by the vacuum pump, the heat will inevitably be carried to the vacuum pump, resulting in a high temperature rise of the vacuum pump and a possible decrease in its efficiency.

3) The heated gas is directed towards the vacuum pressure gauge, which will generate a temperature rise. If the temperature rise exceeds the specified operating temperature range of the vacuum pressure gauge, it may cause indication errors in the vacuum pressure gauge.

The correct usage method should first evacuate and then heat up. When the rated temperature is reached and the vacuum degree is found to have decreased, add some more suction appropriately. This is beneficial for extending the service life of the equipment.

3. The reason why the vacuum drying oven does not have a temperature uniformity parameter

General electric (blast) drying ovens are equipped with temperature uniformity parameters: natural convection drying ovens have a working temperature limit of 3%, while forced convection drying ovens have a working temperature limit of 2.5%. Only the electric vacuum drying oven does not have a temperature uniformity parameter, because the possibility of achieving uniform temperature in the working chamber through the movement of gas molecules in the vacuum drying oven is almost non-existent. Therefore, conceptually, we can no longer apply the temperature uniformity defined by the usual electric (blast) drying oven to the vacuum drying oven. Setting this indicator under vacuum conditions is also meaningless. The amount of thermal radiation is inversely proportional to the square of the distance. The radiation heat received by the same object at a distance of 20cm from the heating wall is only 1/4 of that at a distance of 10cm from the heating wall. The difference is significant. This phenomenon is similar to the fact that in winter, when exposed to the sun, the side that is exposed to the sun is very warm, while the side that is not exposed to the sun is relatively cold. Due to the difficulty in achieving uniform and consistent radiation heat at various points in the three-dimensional space of the working chamber in the structure of the vacuum drying oven, and the lack of evaluation methods, this may be the reason why the temperature uniformity parameter is not included in the standard for electric vacuum drying ovens.

Quality identification

Firstly, structurally speaking, the shell of a typical drying oven is made of cold-rolled steel plates, but there is a significant difference in thickness. Due to the vacuum environment inside the vacuum drying oven, in order to prevent the box from being damaged by atmospheric pressure, the thickness of the outer shell should be slightly larger than that of the blast drying oven. Generally, thicker steel plates are chosen for better quality and longer service life. For ease of observation, glass windows are installed on the doors of the drying oven, usually made of tempered glass and ordinary glass embedded in the doors,

Next, when it comes to temperature, we have to talk about insulation and sealing. At present, the insulation material for domestic drying ovens is mainly fiber cotton, with a few using polyurethane. Below are the different characteristics of the two materials. In terms of insulation effect, polyurethane has better temperature resistance and insulation effect than fiber cotton. Generally, polyurethane can keep the high temperature inside the box stable for several hours. It is worth mentioning that the efficient insulation performance of polyurethane can effectively prevent the operator from being scalded by the high temperature outside the box. The drying oven made of fiber cotton material can only rely on a temperature controller to continuously control and adjust the temperature inside the oven at high temperatures, which greatly increases the working intensity of the fan and controller, thereby reducing the service life of the drying oven. In terms of later maintenance, as polyurethane is injected into the box as a whole, it is particularly cumbersome to carry out repairs in the later stage. Before repair, all polyurethane needs to be removed and injected again after repair. Fiber cotton is not so complicated and the operation is simple. Finally, from the market perspective, fiber cotton is very cheap and can meet most insulation requirements. It is widely used, and the finer and thicker the fiber cotton, the higher the insulation quality. The drying oven is generally sealed with anti-aging silicone rubber, with good sealing effect.

In terms of cyclic heating performance, the selection of fans is crucial, mainly including domestic and imported fans.

Attachment selection: Generally, drying ovens do not have a time controller unless requested by the customer. In other words, the drying time can only be manually controlled. If you need to add a time controller, you can choose one, which costs about 100 yuan.