A high humidity radio frequency thawing refrigeration system

Abstract

The present invention discloses a high-humidity radio frequency thawing refrigeration system, which aims to provide a system that can realize the functions of food freezing, sterilization and rapid thawing. It includes a freezing and refrigeration cycle system, a high-humidity radio frequency thawing system and an auxiliary humidification system; the high-humidity radio frequency thawing system includes a radio frequency power module, a solution box with an upper cover, and a positive plate, a negative plate and a loading platform located in the solution box; the evaporator is placed in the upper part of the solution box, and the positive plate and the negative plate are arranged in parallel on both sides of the loading platform and are respectively connected to the positive and negative poles of the radio frequency power module to form a radio frequency heating unit; the auxiliary humidification system includes a water tank, a gas-liquid separator, a liquid atomizing nozzle and a gas nozzle, and the condenser is placed in the water tank. The system of the present invention has the functions of freezing and rapid thawing, and solves the drying problem caused by overheating at the sharp corners during the radio frequency thawing of food. Moreover, the heating rate is fast, which can avoid the deterioration of food quality caused by the long heating time.

Description

Technical Field

[0001] The invention relates to the technical field of food storage, and more particularly to a high-humidity radio frequency thawing refrigeration system. Background Art

[0002] With the emergence of swine fever and its impact on my country's meat production, the model of meat products will change from "unified production and marketing" to "separation of production and marketing", which means a decrease in fresh meat and an increase in frozen meat, and the meat thawing technology needs to be greatly developed.

[0003] At present, in the research on meat thawing, a patent document with patent number 201821234781.0 and invention name "A frozen meat preservation thawing warehouse" discloses a thawing device, including a thawing warehouse body and an air heater. The thawing warehouse body is equipped with shelves, which is mainly hot air thawing. Since the hot air thawing process often causes heat to be concentrated in a certain part, it affects the quality of the thawed meat. Other thawing technologies also have problems such as too much pyrolysis liquid, large quality loss, uneven heating, and poor thawed meat quality. Summary of the invention

[0004] The purpose of the present invention is to provide a system which can realize the functions of food freezing, sterilization and rapid thawing in view of the technical defects in the prior art.

[0005] The technical solution adopted to achieve the purpose of the present invention is:

[0006] A high-humidity radio frequency thawing refrigeration system, comprising a refrigeration and freezing cycle system, a high-humidity radio frequency thawing system and an auxiliary humidification system; the high-humidity radio frequency thawing system comprises a radio frequency power module, a solution box with an upper cover, and a positive plate, a negative plate and a stage located in the solution box, wherein a fluid through hole is arranged on the stage; the evaporator in the refrigeration and freezing cycle system is placed in the upper part of the solution box, and the upper end and the lower end of the evaporator are respectively provided with a first fan and a second fan; the stage is placed in the lower part of the solution box; the positive plate and the negative plate are arranged in parallel on both sides of the stage and The auxiliary humidification system comprises a water tank, a gas-liquid separator, a liquid atomizing nozzle and a gas nozzle, the condenser in the refrigeration cycle system is placed in the water tank, and the liquid atomizing nozzle and the gas nozzle are respectively located at the upper end and the lower end of the stage; the gas outlet on the water tank is connected to the inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the gas nozzle through a regulating valve, and the first liquid outlet of the gas-liquid separator is connected to the liquid atomizing nozzle through a third valve.

[0007] The solution box is provided with a drain outlet, and the drain outlet is connected to the water storage tank through a drain valve.

[0008] The refrigeration cycle system comprises a compressor, a drying filter or a dryer, the condenser, a throttling element and the evaporator; the exhaust end of the compressor is connected to the inlet of the condenser through the drying filter or the dryer, the outlet of the condenser is connected to the inlet of the evaporator through the throttling element, and the outlet of the evaporator is connected to the suction end of the compressor.

[0009] When the refrigerant of the refrigeration and freezing cycle system is Freon, a drying filter is used; when the refrigerant of the refrigeration and freezing cycle system is ammonia, a drier is used.

[0010] The second liquid outlet of the gas-liquid separator is connected to the inlet of the water tank.

[0011] The radio frequency power supply module includes a DC voltage regulator, which is connected to an AC power supply via a transformer, and an output end of the DC voltage regulator serves as an output end of the radio frequency power supply module.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The high-humidity radio frequency thawing refrigeration system of the present invention can realize the function of food freezing, and at the same time can realize the function of food sterilization and rapid thawing.

[0014] 2. In the system of the present invention, an auxiliary humidification system is added to utilize the latent heat of phase change of the condenser to evaporate the water in the water tank, and the water enters the solution box through the gas-liquid separator, thereby providing a stable environmental humidity for the radio frequency thawing technology, effectively solving the drying problem caused by overheating at the sharp corners during the radio frequency thawing of food, and improving the utilization rate of energy.

[0015] 3. The radio frequency thawing technology is applied in the system of the present invention. Compared with the traditional thawing technology, it has the characteristics of high energy conversion efficiency, fast heating rate, good heating uniformity and deep penetration depth. It can avoid the deterioration of food quality caused by long heating time and improve the quality of food after thawing. It is more suitable for thawing porous media food and has small field intensity changes.

[0016] 4. The system of the present invention collects the generated wastewater, which is environmentally friendly and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the high-humidity radio frequency thawing refrigeration system of the present invention. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The schematic diagram of the high humidity radio frequency thawing refrigeration system of the present invention is as follows Figure 1 As shown, it includes a refrigeration and freezing cycle system, a high-humidity radio frequency thawing system and an auxiliary humidification system. The high-humidity radio frequency thawing system includes a radio frequency power module, a solution box 8 with an upper cover, and a positive plate 6, a negative plate 21 and a stage 5 located in the solution box 8. The stage 5 is provided with a fluid through hole so that the thawed liquid flows into the bottom of the solution box 8 through the fluid through hole. The evaporator 19 in the refrigeration and freezing cycle system is placed in the upper part of the solution box 8, and the upper and lower ends of the evaporator 19 are respectively provided with a first fan 17 and a second fan 20. Among them, the first fan 17 and the second fan 20 are preferably variable frequency fans. The stage 5 is placed in the lower part of the solution box 8. The positive plate 6 and the negative plate 21 are arranged in parallel on both sides of the stage 5 and are respectively connected to the positive and negative poles of the radio frequency power module to form a radio frequency heating unit. The auxiliary humidification system includes a water tank 11, a gas-liquid separator 13, a liquid atomizing nozzle 7 and a gas nozzle 4. The condenser 10 in the refrigeration cycle system is placed in the water tank 11, and the liquid atomizing nozzle 7 and the gas nozzle 4 are respectively located at the upper end and the lower end of the stage 5. The gas outlet on the water tank 11 is connected to the inlet of the gas-liquid separator 13, the gas outlet of the gas-liquid separator 11 is connected to the gas nozzle 4 through a regulating valve 22, and the first liquid outlet of the gas-liquid separator 13 is connected to the liquid atomizing nozzle 7 through a third valve 18. For the convenience of control, a first valve 12 is installed on the pipeline between the water tank 11 and the inlet of the gas-liquid separator 13.

[0020] In order to facilitate the recovery of waste water, a drain outlet is provided on the solution box 8, and the drain outlet is connected to the water storage tank 2 through a drain valve 3.

[0021] In this embodiment, the refrigeration cycle system includes a compressor 16, a filter dryer or a dryer 15, the condenser 10, a throttling element 9 and the evaporator 19. The exhaust end of the compressor 16 is connected to the inlet of the condenser 10 through the filter dryer or the dryer 15, the outlet of the condenser 10 is connected to the inlet of the evaporator 19 through the throttling element 9, and the outlet of the evaporator 19 is connected to the suction end of the compressor 16. When the refrigerant of the refrigeration cycle system is Freon, the filter dryer is used; when the refrigerant of the refrigeration cycle system is ammonia, a dryer is used. The evaporator 19 is a forced air convection evaporator. The condenser 10 is an evaporative condenser.

[0022] In order to facilitate the circulation between the water tank 11 and the gas-liquid separator 13, the second liquid outlet of the gas-liquid separator 13 is connected to the inlet of the water tank 11. In order to facilitate control, a second valve 14 is installed on the pipeline between the inlet of the water tank and the second liquid outlet of the gas-liquid separator 13.

[0023] In this embodiment, the RF power module includes a DC voltage regulator 1, which is connected to an AC power source via a transformer 22, and an output end of the DC voltage regulator 1 serves as an output end of the RF power module.

[0024] The high-humidity radio frequency thawing refrigeration system of the present invention can realize a freezing mode and a thawing mode by switching.

[0025] When the system switches to freezing mode, the first fan 17 is turned on and the second fan 20 is turned off. The compressor 16 is turned on, and the refrigerant flows through the drying filter or dryer 15 to the condenser 10, and then throttled by the throttling element 9 to enter the evaporator 19. The power of the first fan 17 is adjusted, and the cold air is blown to the loading platform at the bottom of the solution box 8 through the first fan 17, providing the required cold air for freezing the food on the loading platform 5 in the solution box 8. The third valve 18 is closed, and the regulating valve 22 is opened. The water vapor evaporated from the water tank 11 passes through the gas-liquid separator 13, and enters the solution box 8 through the regulating valve 22 and the gas nozzle 4, reaching the required environmental humidity in the freezing mode.

[0026] When the system is in defrosting mode, turn on the compressor 16, open the upper cover of the solution box 8, turn off the first fan 17, and turn on the second fan 20. The compressor 16 is turned on, and the refrigerant flows through the drying filter or dryer 15 to the condenser 10, and then enters the evaporator 19 after being throttled by the throttling element 9. The cold air of the evaporator 19 is blown to the outside of the solution box 8 through the second fan to solve the frozen food in the space outside the solution box. At this time, the RF power supply module provides direct current to the positive plate 6 and the negative plate 21, and the RF heating unit starts to work, generating high-frequency electromagnetic waves between the positive plate 6 and the negative plate 21, with a frequency range of 3kHz to 300MHz. At this time, the food on the stage 5 begins to thaw. At the same time, the first valve 12, the second valve 14, the third valve 18 and the regulating valve 22 are opened. The condenser 10 is placed in the water tank 11. The condensation temperature is 60℃-75℃. It exchanges heat with the water in the water tank 11. The water in the water tank 11 evaporates and enters the gas-liquid separator 13. The water vapor passes through the gas-liquid separator 13. A part of it passes through the regulating valve 22 and the gas nozzle 4 into the solution box 8 to humidify the food on the loading platform 5; the other part condenses. A part of the condensed water passes through the second valve 14 into the water tank 13 to form a cooling water cycle, and the other part of the condensed water passes through the third valve 18 and the liquid atomizing nozzle and is sprayed from top to bottom into the solution box 8 to ensure the humidity required for the food thawing process.

[0027] The high-humidity radio frequency thawing refrigeration system of the present invention can realize the function of food freezing, and at the same time can realize the function of food sterilization and rapid thawing. By adding an auxiliary humidification system, the water in the water tank is evaporated by utilizing the latent heat of phase change of the condenser, and enters the solution box through the gas-liquid separator, providing a stable environmental humidity for the radio frequency thawing technology, and effectively solving the drying problem caused by overheating at the corners during the radio frequency thawing of food. The radio frequency thawing technology is applied, which has the characteristics of high energy conversion efficiency, fast heating rate, good heating uniformity, and deep penetration depth compared to traditional thawing technology, and can avoid the deterioration of food quality caused by long heating time. It is more suitable for thawing of porous medium foods.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high humidity radio frequency thawing refrigeration system, characterized in that: It comprises a refrigeration and freezing cycle system, a high-humidity radio frequency thawing system and an auxiliary humidification system; the high-humidity radio frequency thawing system comprises a radio frequency power module, a solution box with an upper cover, and a positive plate, a negative plate and a loading platform located in the solution box, and a fluid through hole is arranged on the loading platform; the evaporator in the refrigeration and freezing cycle system is placed in the upper part of the solution box, and the upper and lower ends of the evaporator are respectively provided with a first fan and a second fan; the loading platform is placed in the lower part of the solution box; the positive plate and the negative plate are arranged in parallel on both sides of the loading platform and are respectively connected to the positive and negative poles of the radio frequency power module to form a radio frequency heating unit; the auxiliary humidification The system includes a water tank, a gas-liquid separator, a liquid atomizing nozzle and a gas nozzle. The condenser in the freezing and refrigeration cycle system is placed in the water tank, and the liquid atomizing nozzle and the gas nozzle are respectively located at the upper end and the lower end of the stage; the gas outlet on the water tank is connected to the inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the gas nozzle through a regulating valve, and the first liquid outlet of the gas-liquid separator is connected to the liquid atomizing nozzle through a third valve; a drain outlet is provided on the solution box, and the drain outlet is connected to the water storage tank through a drain valve; the second liquid outlet of the gas-liquid separator is connected to the inlet of the water tank.

2. The high humidity radio frequency thawing refrigeration system according to claim 1, characterized in that: The refrigeration cycle system comprises a compressor, a drying filter or a dryer, the condenser, a throttling element and the evaporator; the exhaust end of the compressor is connected to the inlet of the condenser through the drying filter or the dryer, the outlet of the condenser is connected to the inlet of the evaporator through the throttling element, and the outlet of the evaporator is connected to the suction end of the compressor.

3. The high humidity radio frequency thawing refrigeration system according to claim 2, characterized in that: When the refrigerant of the refrigeration and freezing cycle system is Freon, the drying filter is used; when the refrigerant of the refrigeration and freezing cycle system is ammonia, the dryer is used.

4. The high humidity radio frequency thawing refrigeration system according to claim 1, characterized in that: The radio frequency power supply module includes a DC voltage regulator, which is connected to an AC power supply via a transformer, and an output end of the DC voltage regulator serves as an output end of the radio frequency power supply module.

5. The high humidity radio frequency thawing refrigeration system according to claim 1, characterized in that: The evaporator is a forced air convection evaporator.

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