Novel low-temperature low-humidity drying device assisted by electric field

Abstract

The invention provides a novel low-temperature and low-humidity drying device assisted by an electric field. The novel low-temperature and low-humidity drying device is composed of a condenser, a refrigerant pipeline, a regeneration exhaust fan, a rotating wheel, a condenser, an air pipe, an evaporator, an air supply fan, a drying box body, a goods shelf, an electrostatic field generator, a compressor and an electronic expansion valve. And the intensity of an electric field generated by the electrostatic field generator is 4kV-8kV. The condenser is not provided with a fan, so that the temperature of regenerated air is ensured; the speed of a fan arranged on the condenser can be adjusted, so that the heat emitted by the condenser and the heat emitted by the condenser respectively can be distributed. The low-temperature drying air is used for drying articles, and it can be guaranteed that heat-sensitive substances of the articles needing to be dried are not volatilized after being dried; heat dissipation of the condenser of the refrigerating system is adopted for heating regenerated air instead of traditional electric heating, and the energy-saving effect is achieved; the activity of moisture at low temperature is excited by adopting an electrostatic field irradiation method, so that the drying rate is accelerated.

Description

Technical Field

[0001] This invention relates to the fields of pharmaceutical and food machinery technology, and more specifically, to a novel low-temperature and low-humidity drying device assisted by an electric field. Background Technology

[0002] Drying is one of the important methods for storing food and medicinal materials. Analyzing the drying mechanism, current methods mainly include hot air drying (e.g., patent application CN202510587178.9, a rapid drying device for food bags); microwave drying (e.g., CN202421802286.0, a novel box-type microwave dryer); low-temperature spray drying (e.g., patent application CN202510610563.0, a low-temperature spray drying device); and freeze-vacuum drying (e.g., patent application CN202510676250.5, a high-efficiency vegetable vacuum drying device and its usage method). These methods promote the storage of food and medicinal materials, but they also have drawbacks. Food and medicinal materials contain a large number of heat-sensitive substances that volatilize significantly at temperatures above 40°C, causing a decrease in nutritional content or medicinal efficacy, as seen in hot air drying and microwave drying. For low-temperature spray drying, it is necessary to thoroughly break down the material to be dried, destroying its shape. The freeze-vacuum drying method requires freezing materials to low temperatures, which consumes a lot of energy and cannot meet the needs of modern industries requiring low energy consumption. Therefore, a novel low-temperature and low-humidity drying device assisted by an electric field is proposed. Summary of the Invention

[0003] This invention addresses the shortcomings and drawbacks of existing drying methods by proposing an electric field-assisted low-temperature, low-humidity drying device. At low temperatures, the heat-sensitive substances are fully preserved. To increase the drying rate, a rotary wheel is employed, reducing the humidity of the drying air. Furthermore, to enhance the activity of moisture within the material, an electrostatic field is used to further improve the drying rate. This invention provides the following technical solution: A novel electric field-assisted low-temperature, low-humidity drying device, comprising a refrigeration cycle system, a drying air circulation system, a regenerated air system, an electrostatic field-assisted system, and a drying space; the refrigeration cycle system includes a compressor, a condenser, an electronic expansion valve, and an evaporator connected sequentially via refrigerant pipes; the drying air circulation system includes a blower, ductwork, and an evaporator. The system comprises a duct, a rotary drum, and a drying chamber. The outlet of the supply fan is connected to the evaporator via a duct, and the evaporator is connected to the rotary drum via a duct. The rotary drum is connected to the air inlet of the drying chamber, and the air outlet of the drying chamber is connected to the air inlet of the supply fan to form a circulation. The drying chamber is equipped with shelves for placing items to be dried. The regenerated air system includes a rotary drum and a regenerated exhaust fan. The air inlet of the regenerated exhaust fan is connected to the rotary drum, and the air inlet path of the regenerated exhaust fan passes through the heat dissipation side of the condenser. The electrostatic field auxiliary system includes an electrostatic field generator, which is installed inside the drying chamber and is used to apply an electrostatic field to the items to be dried on the shelves.

[0004] As a preferred technical solution of the present invention, the electrostatic field generated by the electrostatic field generator has an electrostatic field strength of 4kV to 8kV, which can continuously apply an electrostatic field to the items to be dried to improve the activity of moisture inside the material.

[0005] As a preferred technical solution of the present invention, the condenser does not have a fan and heats the regenerated air by its own heat dissipation to ensure the temperature of the regenerated air when it enters the impeller; the condenser is equipped with an adjustable speed fan, which distributes the heat dissipation of the condenser by adjusting the fan speed to adapt to the temperature requirements under different operating conditions.

[0006] As a preferred technical solution of the present invention, the rotor is an adsorption dehumidification rotor, which is filled with silica gel or molecular sieve adsorption material. It can absorb the moisture of the dry air in the dry air circulation system, and at the same time, the moisture is desorbed by the regenerated air of the regenerated air system to achieve recycling.

[0007] As a preferred technical solution of the present invention, the evaporator is a tube-fin heat exchanger, in which the refrigerant flows inside the evaporator and the drying air flows in the external channel of the evaporator, thereby achieving cooling and dehumidification of the drying air through heat exchange.

[0008] As a preferred technical solution of the present invention, the shelf is made of a metal mesh plate with a mesh diameter of 5mm to 15mm, which can stably place the items to be dried without obstructing the penetration of the electrostatic field and the flow of drying air.

[0009] As a preferred technical solution of the present invention, the inner wall of the drying chamber is provided with a heat insulation layer, which is made of extruded polystyrene foam material and has a thickness of not less than 50mm, so as to reduce the heat exchange between the inside and outside of the drying chamber and maintain a low temperature environment inside the chamber.

[0010] As a preferred technical solution of the present invention, both the air duct and the inner wall of the air duct are provided with an anti-corrosion coating. The anti-corrosion coating is made of epoxy resin material to prevent the moisture carried by the dry air from causing corrosion of the inner wall of the air duct and to extend the service life of the device.

[0011] As a preferred technical solution of the present invention, it also includes a temperature sensor and a humidity sensor, both of which are installed inside the drying chamber and are used to monitor the temperature and humidity inside the drying chamber in real time.

[0012] As a preferred technical solution of the present invention, it also includes a controller, which is electrically connected to the temperature sensor, the humidity sensor and the adjustable speed fan of the condenser respectively. When the temperature inside the drying chamber is higher than the preset low temperature threshold, the controller increases the speed of the condenser fan to increase the heat dissipation. When the humidity is higher than the preset low humidity threshold, the controller adjusts the regeneration efficiency of the rotor to enhance dehumidification.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The low-temperature drying air used in this invention to dry items can ensure that the heat-sensitive substances in the items to be dried are not volatilized after drying; 2. This invention uses the heat dissipation of the condenser in the refrigeration system to heat the regenerated air, instead of traditional electric heating, which has an energy-saving effect; 3. This invention uses electrostatic field irradiation to stimulate the activity of moisture at low temperatures, thereby accelerating the drying rate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure provided by the present invention.

[0015] The image shows: 1. Condenser; 2. Refrigerant piping; 3. Regeneration exhaust fan; 4. Rotor; 5. Condenser; 6. Air duct; 7. Air duct; 8. Evaporator; 9. Supply fan; 10. Drying chamber; 11. Shelf; 12. Electrostatic field generator; 13. Compressor; 14. Electronic expansion valve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention.

[0017] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] Example 1: A novel low-temperature, low-humidity drying device assisted by an electric field includes a refrigeration cycle system, a drying air circulation system, a regenerated air system, an electrostatic field auxiliary system, and a drying space. The refrigeration cycle system includes a compressor 13, a condenser 5, a condenser 1, an electronic expansion valve 14, and an evaporator 8 connected sequentially via a refrigerant pipe 2. The drying air circulation system includes a blower 9, a duct 7, an evaporator 8, a duct 6, a rotor 4, and a drying chamber 10. The outlet of the blower 9 is connected to the evaporator 8 via the duct 7, and the evaporator 8 is connected to the rotor 4 via the duct 6. The wheel 4 is connected to the air inlet of the drying chamber 10, and the air outlet of the drying chamber 10 is connected to the air inlet of the blower 9 to form a circulation. The drying chamber 10 is equipped with a shelf 11 for placing items to be dried. The regenerated air system includes the wheel 4 and the regenerated exhaust fan 3. The air inlet of the regenerated exhaust fan 3 is connected to the wheel 4, and the air inlet path of the regenerated exhaust fan 3 passes through the heat dissipation side of the condenser 5. The electrostatic field auxiliary system includes an electrostatic field generator 12, which is installed inside the drying chamber 10 and is used to apply an electrostatic field to the items to be dried on the shelf 11.

[0019] The electrostatic field generated by the electrostatic field generator 12 has an electrostatic field strength of 4kV to 8kV, which can continuously apply an electrostatic field to the items to be dried to improve the activity of moisture inside the material.

[0020] Condenser 5 does not have a fan and heats the regenerated air through its own heat dissipation to ensure the temperature of the regenerated air when it enters rotor 4; condenser 1 is equipped with an adjustable speed fan, which distributes the heat dissipation of condenser 5 and condenser 1 by adjusting the fan speed to meet the temperature requirements under different operating conditions.

[0021] Rotor 4 is an adsorption-type dehumidification rotor, filled with silica gel or molecular sieve adsorption material. It can absorb moisture from the dry air in the dry air circulation system and simultaneously desorb moisture through the regenerated air in the regenerated air system for recycling.

[0022] Evaporator 8 is a tube-fin heat exchanger. The refrigerant flows inside evaporator 8, and the dry air flows through the external channel of evaporator 8. The cooling and dehumidification of the dry air are achieved through heat exchange.

[0023] Shelf 11 is made of metal mesh with a mesh size of 5mm to 15mm, which can stably place items to be dried without obstructing the penetration of electrostatic field and the flow of drying air.

[0024] The inner wall of the drying chamber 10 is provided with an insulation layer, which is made of extruded polystyrene foam material and has a thickness of not less than 50mm, in order to reduce heat exchange between the inside and outside of the drying chamber 10 and maintain a low temperature environment inside the chamber.

[0025] The inner walls of both duct 6 and duct 7 are coated with an anti-corrosion coating made of epoxy resin to prevent moisture carried by dry air from causing corrosion of the inner walls of the ducts and to extend the service life of the equipment.

[0026] It also includes a temperature sensor 15 and a humidity sensor 16, both of which are installed inside the drying chamber 10 and are used to monitor the temperature and humidity inside the drying chamber 10 in real time.

[0027] It also includes a controller 17, which is electrically connected to the temperature sensor 15, the humidity sensor 16 and the adjustable speed fan of the condenser 1. When the temperature inside the drying chamber 10 is higher than the preset low temperature threshold, the controller 17 increases the fan speed of the condenser 1 to increase the heat dissipation. When the humidity is higher than the preset low humidity threshold, the controller 17 adjusts the regeneration efficiency of the rotor 4 to enhance dehumidification.

[0028] Example 2: The device of the present invention consists of a condenser 1, a refrigerant pipeline 2, a regeneration exhaust fan 3, a rotor 4, a condenser 5, an air duct 6, an air duct 7, an evaporator 8, a blower 9, a drying chamber 10, a shelf 11, an electrostatic field generator 12, a compressor 13, and an electronic expansion valve 14.

[0029] During operation, the high-temperature and high-pressure refrigerant vapor first flows through condenser 5 to heat and cool the regenerated air. The refrigerant after passing through condenser 5 further enters condenser 1, where it is completely condensed and then enters the electronic expansion valve to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. The liquid two-phase refrigerant enters evaporator 8 to cool the circulating dry air, absorbs heat, and becomes low-temperature and low-pressure vapor, which enters the compressor and becomes high-temperature and high-pressure refrigerant vapor. This cycle continues.

[0030] The regenerated air is heated after passing through the condenser 5 and enters the rotor 4 to absorb the moisture in the rotor 4. Then it is directly discharged into the environment by the regeneration exhaust fan 3.

[0031] Drying air is sent into the drying chamber 10 by the blower 9, flows over the shelf 11, carries away the moisture of the items to be dried, enters the air duct 6, flows over the impeller 4, the moisture in the drying air is absorbed by the impeller 4 and then enters the air duct 7, flows through the evaporator 8 to cool down, and is then sent into the drying chamber 10 by the blower 9, and so on.

[0032] When the electrostatic field generator 12 is working, it continuously releases a static voltage of 4kV to 8kV to continuously apply an electric field to the items that need to be dried.

[0033] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A novel low-temperature, low-humidity drying device assisted by an electric field, characterized in that, The system includes a refrigeration cycle system, a dry air circulation system, a regenerated air system, an electrostatic field auxiliary system, and a drying space. The refrigeration cycle system includes a compressor (13), a condenser (5), a condenser (1), an electronic expansion valve (14), and an evaporator (8) connected sequentially through a refrigerant pipe (2). The dry air circulation system includes a blower (9), a duct (7), an evaporator (8), a duct (6), a rotor (4), and a drying chamber (10). The outlet of the blower (9) is connected to the evaporator (8) through the duct (7), and the evaporator (8) is connected to the rotor (4) through the duct (6). The rotor (4) is connected to the drying chamber. The air inlet of (10) is connected, and the air outlet of the drying box (10) is connected to the air inlet of the blower (9) to form a circulation. The drying box (10) is equipped with a shelf (11) for placing items to be dried. The regenerated air system includes a wheel (4) and a regenerated exhaust fan (3). The air inlet of the regenerated exhaust fan (3) is connected to the wheel (4), and the air inlet path of the regenerated exhaust fan (3) passes through the heat dissipation side of the condenser (5). The electrostatic field auxiliary system includes an electrostatic field generator (12). The electrostatic field generator (12) is installed in the drying box (10) and is used to apply an electrostatic field to the items to be dried on the shelf (11).

2. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The electrostatic field strength emitted by the electrostatic field generator (12) is 4kV to 8kV.

3. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The condenser (5) does not have a fan and heats the regenerated air by its own heat dissipation to ensure the temperature of the regenerated air when it enters the rotor (4); the condenser (1) is equipped with an adjustable speed fan, which distributes the heat dissipation of the condenser (5) and the condenser (1) by adjusting the fan speed.

4. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The impeller (4) is an adsorption dehumidification impeller, which is filled with silica gel or molecular sieve adsorption material. It can absorb the moisture of the dry air in the dry air circulation system and desorb the moisture through the regenerated air of the regenerated air system for recycling.

5. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The evaporator (8) is a tube-fin heat exchanger. The refrigerant flows inside the evaporator (8), and the dry air flows through the external channel of the evaporator (8). The dry air is cooled and dehumidified through heat exchange.

6. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The shelf (11) is made of metal mesh plate with a mesh diameter of 5mm to 15mm.

7. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The inner wall of the drying chamber (10) is provided with a heat insulation layer, which is made of extruded polystyrene foam material and has a thickness of not less than 50mm, so as to reduce the heat exchange between the inside and outside of the drying chamber (10) and maintain the low temperature environment inside the chamber.

8. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, The inner walls of the air duct (6) and air duct (7) are provided with anti-corrosion coatings, which are made of epoxy resin.

9. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 1, characterized in that, It also includes a temperature sensor (15) and a humidity sensor (16), both of which are installed inside the drying chamber (10) and are used to monitor the temperature and humidity inside the drying chamber (10) in real time.

10. The novel low-temperature and low-humidity drying device assisted by an electric field according to claim 9, characterized in that, It also includes a controller (17), which is electrically connected to the temperature sensor (15), humidity sensor (16) and the adjustable speed fan of the condenser (1). When the temperature inside the drying chamber (10) is higher than the preset low temperature threshold, the controller (17) increases the fan speed of the condenser (1) to increase the heat dissipation. When the humidity is higher than the preset low humidity threshold, the controller (17) adjusts the regeneration efficiency of the rotor (4) to enhance dehumidification.

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