Structure and characteristics of vacuum drying equipment
With the continuous development of industrial technology, most of the atmospheric drying equipment using closed and close-closed type are designed as vacuum drying equipment. The vacuum drying equipment is designed for drying heat sensitive, easily decomposable and easily oxidizable substances. It can keep the working chamber under a certain degree of vacuum and can be filled with inert gas inside. Vacuum drying equipment has a wide variety of structures and structures. The classification method is also different. There are several types of vacuum drying equipment: vacuum tray continuous dryer, double cone rotary vacuum dryer, plate vacuum dryer, low temperature belt continuous vacuum dryer, continuous vacuum dryer. Vacuum drying is to reduce the boiling point of the moisture by reducing the pressure of the drying chamber to achieve the purpose of drying at a low temperature. Industrial dryers can be divided into conduction and convection according to their heating methods. Looking back at the development of industrial dryers, it can be divided into several stages. Before the 1950s, it was mainly based on conductive (such as box ovens and vacuum ovens). From manual loading and unloading to semi-mechanical, mechanized and continuous drying. After the 1950s, the development of drying technology to meet the requirements of large-scale, high-efficiency, continuous, and automated processing of industrial drying, focused on the development and development of convection dryers. By the early 1970s, convection dryers had replaced the dominant position of conductive dryers. However, with the development of industry, in the aspects of energy saving, environmental protection, cleanliness, etc., new requirements are put on the dryer, and these are the requirements that the convection dryer is difficult to solve at one time, and thus the conduction type has been newly developed. From the 1970s to the early 1980s, various new types of conductive dryers (such as multi-layer belt vacuum dryers, double cone rotary dryers, vane type, vibrating dryers, etc.) replaced convection dryers. . Of course, in order to meet the requirements of energy saving, environmental protection and cleanliness, the convection type is also being improved, for example, combining a conductive heating surface with a fluidized dryer. The vacuum dryer belongs to conductive drying, that is, the condenser, the vacuum pump and the conductive dryer are matched to form a vacuum drying device. Because vacuum drying has the advantages of low drying temperature, large drying rate, energy saving, equipment sealing and pollution prevention, most of the conductive dryers can be designed as vacuum drying devices, vacuum drying in biological products, medicines, drinks and heat sensitive materials, oxygen sensitive. It plays a unique role in the drying of materials and solvents. The vacuum drying equipment can be divided into batch type continuous type according to the operation mode; according to the state of the material in the drying process, it can be divided into static type, flip type, agitation type and vibration type; according to the drying mechanism, it can be divided It is an evaporation type and a sublimation type. Since the vacuum drying apparatus can obtain a higher drying rate at a lower temperature, the heat sensitive material can be dried at a low temperature, and the oxygen sensitive material can also be dried. Or materials with a burning hazard, suitable for drying materials containing solvents or toxic gases. Solvent recovery is easy, the material can be dried to a very low moisture, and can be used for further drying of low moisture content materials, so that vacuum drying technology has been greatly developed. Therefore, it has become one of the main types of drying equipment. Although vacuum drying equipment has many forms, there are two common rules. First, vacuum dryers are mostly conduction heat transfer, and most dry systems have no solid addition system. Second, most dryers are equipped with heating jackets, which have high requirements for structural design and processing quality. Most of the vacuum drying treatments are high value-added materials. Vacuum drying equipment structure 1, intelligent program LCD temperature controller 2, inert gas intake valve 3, imported vacuum table 4, the lower cabinet The outer surface of the electric vacuum drying oven is stamped and welded by steel plate, and the surface of the outer casing is treated with high-strength electrostatic spray coating, and the paint film is smooth and firm. The studio is made of carbon steel or stainless steel, and the insulation between the studio and the outer casing is filled with insulation cotton. A sample shelf is placed inside the studio for placing various test items, and a mica heater is placed around the outside of the work wall. The door seal is sealed with a silicone rubber strip, and a sight glass for observation is provided on the door. The evacuation and inflation of the electric vacuum drying oven are controlled by a solenoid valve. The electrical box is on the left or the lower part of the cabinet. The front panel of the electrical box is equipped with a vacuum gauge, a temperature control instrument and a control switch. The electrical box is equipped with electrical components. working principle The electric vacuum drying oven maintains a certain degree of vacuum in the working chamber and uses an intelligent digital temperature controller for temperature setting, display and control. The temperature regulator uses computer technology to collect and process the temperature signal in the working chamber, so that the temperature in the working chamber can be automatically kept at a constant temperature. The temperature control system is PID intelligent temperature control, reliable performance and convenient to use. Intelligent temperature regulators have over temperature protection. When the temperature in the working chamber exceeds the set temperature value during the operation of the device, the over-temperature protection circuit operates to cut off the heating circuit. Vacuum drying equipment is widely used in the vacuum drying and mixing of powder and granular materials in the pharmaceutical, food, chemical and other industries. Adhesive Nano Tape,Removable Gel Grip Tape,Nano Adhesive Grip Tape,Traceless Washable Tape Kunshan Jieyudeng Intelligent Technology Co., Ltd. , https://www.yuhuanptapes.com