CN204388482U - High voltage electric field vacuum drying system - Google Patents

Abstract

A high-voltage electric field vacuum drying system relates to the drying technology. The drying device comprises a closed tank body, wherein a plurality of groups of high-voltage electric field drying units are arranged in the tank body, each group of high-voltage electric field drying units comprises an electrode net and a material tray, and the electrode net is in conductive connection with a high-voltage generator which is arranged outside the tank body and generates a high-voltage electric field; the vacuum system is communicated with the tank body. The vacuum drying, especially the vacuum freeze drying and the high-voltage electric field drying, have the advantages of the high-voltage electric field in the tank body, and the negative pressure low-temperature environment is formed, so that the vacuum drying technology and the high-voltage electric field drying technology are organically combined and mutually promoted. Meanwhile, the defects of vacuum drying and high-voltage electric field drying are overcome, the equipment is simplified, the manufacturing cost is reduced, and the ozone generated by the high-voltage electric field is greatly reduced. The method has wide application, can well maintain the color and the nutritional ingredients of the materials, and is suitable for drying agricultural products, aquatic products, traditional Chinese medicinal materials and the like.

Description

High voltage electric field vacuum drying system

technical field

The utility model relates to drying technology, in particular to a high-voltage electric field vacuum drying system. It is suitable for drying and antisepsis of agricultural products, aquatic products, Chinese medicinal materials and other materials.

Background technique

Vacuum drying is a main way of modern drying technology. It is a drying method in which the material is placed under negative pressure conditions, and the water molecules are directly cooled under the negative pressure state by proper heating to dry the material. During the vacuum drying process, the pressure in the drying chamber is always lower than the atmospheric pressure, the number of gas molecules is small, and the density is low, so it is beneficial to dry materials that are easy to oxidize and deteriorate, and can play a certain role in disinfection and sterilization of food and biological products, which can reduce The chance of material contamination, or inhibit the growth of some bacteria; when vacuum drying, the moisture in the material can be vaporized at low temperature, and low temperature drying can be realized, which is beneficial to the drying of heat-sensitive materials in agricultural products and aquatic products. The condition of vacuum drying is to place the material in a negative pressure space, which needs to generate a pressure lower than the atmosphere in a certain space, so the equipment is more complicated, the manufacturing is more difficult, the cost is high, and the energy consumption is high.

High voltage electric field drying technology is a new drying method developed in recent years. It has a good maintenance effect on the color and nutrient content of the material. The Chinese patent discloses the "sea cucumber energy-saving drying device" (authorized announcement number CN202262388U). In a box, there are high-voltage electrode plates and flat bottom electrodes parallel to each other. The material to be dried (such as sea cucumber) is placed on the lower electrode of the plate. It shows that its equipment is simple, easy to manufacture, low in cost, and low in operating costs. However, high-voltage electric field drying also has shortcomings. Under the high-voltage electric field environment, a large amount of ozone is produced in the air. Low-concentration ozone can sterilize and sterilize, but it will pollute the environment and the dried materials to a certain extent.

The market needs a combined drying system that can give full play to the advantages of vacuum drying and high-voltage electric field drying, and overcome the shortcomings of both. It is beneficial to dry materials that are easy to oxidize and deteriorate, and is suitable for heat-sensitive materials in agricultural products and aquatic products. Drying can well maintain the color and nutrient content of materials. At the same time, the equipment is easy to manufacture, low in cost, low in operating costs, and easy to promote.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the deficiencies of the existing vacuum drying and high-voltage electric field drying, and provide a high-voltage electric field vacuum drying system. This system gives full play to the advantages of vacuum drying and high-voltage electric field drying, and overcomes the shortcomings of both. It is suitable for drying agricultural products, aquatic products, and Chinese medicinal materials, and can well maintain the color and nutrition of materials. Composition, good drying effect, at the same time, the equipment is easy to manufacture, low in cost, low in operating costs, can further reduce drying costs, and is easy to promote.

For this reason, the utility model high-voltage electric field vacuum drying system adopts the following technical solutions:

The high-voltage electric field vacuum drying system includes a closed tank, and multiple sets of high-voltage electric field drying units are installed in the tank. Each set of high-voltage electric field drying units includes electrode nets and material trays. The electrode nets are set above the material trays. The high-voltage generator that generates a high-voltage electric field outside the tank is conductively connected; it also includes a vacuum system that generates a certain degree of vacuum in the tank, and the vacuum system communicates with the tank.

The above-mentioned technical scheme is further elaborated:

The electrode net is grid-shaped, and a metal electrode frame is formed on the periphery of the electrode net to connect the electrode net into a whole.

The electrode network is composed of a plurality of metal wires parallel to each other with a certain distance. Each metal wire is fixed with evenly arranged metal discharge needles, and each discharge needle is kept perpendicular to the plane formed by the metal wires.

Adjacent high-voltage electric field drying units are arranged up and down, thereby forming an overall layout of all high-voltage electric field drying units up and down.

Adjacent high-voltage electric field drying units are connected and fixed through insulating porcelain bottles.

The material pallet is grounded through the tank.

The vacuum system includes a vacuum pump, an electromagnetic vacuum valve, a cold trap and a flow regulating valve connected in sequence, and the flow regulating valve is also connected to the tank.

The tank body is also equipped with an inflation valve capable of inflating the tank.

The tank is also equipped with a vacuum gauge for measuring the vacuum inside the tank.

The tank is also equipped with a thermocouple for measuring the temperature inside the tank.

The working mechanism of the utility model includes high-voltage electric field corona discharge drying and vacuum freeze drying, the two are organically integrated, and the specific description is as follows:

The vacuum freeze-drying of the utility model produces an external environment conducive to the evaporation of water in the material. The vacuum system in the tank forms a certain degree of negative pressure, the air is thin and the density is low, which promotes the rapid evaporation of moisture in the material. Moreover, with the cooperation of the cold trap, when the vacuum degree in the tank reaches a high level, the moisture in the material can be directly sublimated from solid to gaseous state and discharged. The evaporated water is pumped out by a vacuum pump, forming a virtuous cycle that is conducive to maintaining a certain degree of vacuum in the tank.

The high-voltage electric field of the utility model provides internal power to promote evaporation for the water molecules in the material. The effect of the high-voltage electric field of the utility model is multifaceted: First, the electrode network forms a corona discharge, and its ion beam has an injection effect on the interior of the water-containing material, which increases the energy of the water molecules and causes the chain molecular cluster water molecules to The hydrogen bonds between them are broken, and they are broken into many active individual water molecules with obvious polarity, which reduces the volume of a single water molecule group, thereby reducing the resistance of water molecules from the material. Second, the non-uniform electric field formed by corona discharge generates traction on the internal water molecules of the material. Third, the corona discharge process is due to the high-speed ion jet flow caused by the electron avalanche, and the formed ion wind accelerates the movement of water molecules on the surface of the material, reduces the humidity of the air on the surface of the material, and increases the air humidity gradient on the surface of the material. The ion wind blows the water molecules escaping from the surface to the environment, so that the internal water molecules of the material are continuously transported to the surface layer, and the transportation process of water molecules is accelerated.

The synergistic effect of the low temperature and negative pressure in the tank and the high-voltage electric field promotes the drying of the materials in the tank.

Compared with the prior art, the utility model has the beneficial effects of:

First, the advantages of vacuum drying, especially vacuum freeze drying and high-voltage electric field drying are fully utilized. In the tank, there is both a high-voltage electric field and a negative pressure and low temperature environment, forming vacuum drying technology and high-voltage electric field drying technology. The organic combination of the two promotes each other.

Second, the shortcomings of both vacuum drying and high-voltage electric field drying can be overcome. 1) Only a certain degree of negative pressure needs to be formed in the tank, which simplifies the equipment of the vacuum system and reduces the manufacturing cost. 2) Because the air in the tank is thin, there are few air molecules and oxygen molecules, the amount of ozone generated by the high-voltage electric field is greatly reduced, and the concentration of ozone is low. Low concentration ozone has a bactericidal effect, and the pollution to air and materials is greatly reduced.

Third, it has a wide range of uses, and is suitable for drying heat-sensitive materials in agricultural products and aquatic products, as well as drying Chinese herbal medicines, etc., and can well maintain the color and nutritional content of materials. Further reduce the drying cost and facilitate popularization.

Description of drawings

Fig. 1 is the three-dimensional schematic view of the utility model;

Fig. 2 is a schematic diagram of the principle of the utility model.

In the figure: 1. High voltage generator; 2. Material tray; 3. Electrode net; 4. Insulated porcelain bottle; 5. Inflatable valve; 6. Vacuum gauge; 7. Thermocouple; 8. Tank body; 9. Flow regulating valve; 10. Cold trap; 11. Electromagnetic vacuum valve; 12. Vacuum pump; 13. Vacuum system.

Detailed ways

Introduce the specific embodiment of the present utility model below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, the high-voltage electric field vacuum drying system includes a closed tank body 8, and multiple sets of high-voltage electric field drying units are installed in the tank body 8, and each set of high-voltage electric field drying units includes electrode grids 3 and material trays 2 , the electrode net 3 is arranged on the top of the material tray 2, and the electrode net 3 is conductively connected with the high-voltage generator 1 which is arranged outside the tank body 3 and generates a high-voltage electric field; it also includes a vacuum system 13 for generating a certain degree of vacuum in the tank body 8, The vacuum system 13 communicates with the tank body 8 .

The electrode net 3 is grid-shaped, and a metal electrode frame is formed on the periphery of the electrode net 3 to connect the electrode net into a whole.

The electrode network 3 is composed of a plurality of metal wires parallel to each other with a certain distance, each metal wire is fixed with evenly arranged metal discharge needles, and each discharge needle is kept perpendicular to the plane formed by the metal wires.

Adjacent high-voltage electric field drying units are arranged up and down, thereby forming an overall layout of all high-voltage electric field drying units up and down.

Adjacent high-voltage electric field drying units are connected and fixed through insulating porcelain bottles 4 .

The material pallet 2 is grounded through the tank body 8 .

The vacuum system 13 includes a vacuum pump 12 (a mechanical vacuum pump can be selected), an electromagnetic vacuum valve 11 , a cold trap 10 and a flow regulating valve 9 connected in sequence, and the flow regulating valve 9 is also connected to the tank body 9 .

The tank body 8 is also equipped with an inflation valve 5 that can inflate the tank.

The tank body 8 is also equipped with a vacuum gauge 6 for measuring the vacuum degree in the tank.

The tank body 8 is also equipped with a thermocouple 7 for measuring the temperature inside the tank.

The utility model is an organic combination of vacuum drying technology and high-voltage electric field drying technology. Taking the best of the two, the advantages of both vacuum drying and high-voltage electric field drying are fully utilized. In the low temperature environment, the two promote each other. At the same time, the disadvantages of both are avoided. It is suitable for drying heat-sensitive materials in agricultural products and aquatic products, as well as drying Chinese medicinal materials. It can well maintain the color and nutritional content of materials. At the same time, the equipment is easy to manufacture, low in cost, and low in operating costs, which can further reduce drying costs.

Claims (10)

1. high voltage electric field vacuum drying system, it is characterized in that: comprise airtight tank body, many group high electric field drying unit are installed in this tank body, often organize high electric field drying unit and comprise electrode network and material tray, electrode network is arranged at the top of material tray, and electrode network conducts electricity with the high pressure generator of the generation high voltage electric field be arranged on outside tank body and is connected; Also comprise the vacuum system making to produce certain vacuum degree in tank body, vacuum system is communicated with tank body.

2. high voltage electric field vacuum drying system according to claim 1, is characterized in that: electrode network is latticed, and is shaped with metal electrode frame electrode network being connected into entirety in the periphery of electrode network.

3. high voltage electric field vacuum drying system according to claim 2, it is characterized in that: electrode network is made up of the many metal wires with certain distance that are parallel to each other, each metal wire is connected with the metal discharge pin evenly arranged, the plane that each spray point and metal wire form keeps vertical.

4. high voltage electric field vacuum drying system according to claim 1, is characterized in that: adjacent high electric field drying unit is controlled up and down, thus forms the upper and lower integral layout of whole high electric field drying unit.

5. high voltage electric field vacuum drying system according to claim 4, is characterized in that: adjacent high electric field drying unit is fixedly mounted with by porcelain insulator connection.

6. high voltage electric field vacuum drying system according to claim 1, is characterized in that: material tray is by described tank ground.

7. high voltage electric field vacuum drying system according to claim 1, is characterized in that: described vacuum system comprises the vavuum pump, solenoid vacuum valve, cold-trap and the flow control valve that are communicated with successively, and flow control valve is also connected with tank body.

8. high voltage electric field vacuum drying system according to claim 1, is characterized in that: tank body is the equipped charge valve can inflated in tank also.

9. high voltage electric field vacuum drying system according to claim 1, is characterized in that: tank body is the equipped vacuum meter measuring vacuum in tank also.

10. high voltage electric field vacuum drying system according to claim 1, is characterized in that: tank body is the equipped thermocouple measuring temperature in tank also.