Split-range microwave freeze-drying device

Abstract

The utility model relates to the technical field of microwave drying, and discloses a split-range microwave freeze-drying device which comprises a quick-freezing chamber, the top of the quick-freezing chamber is fixedly connected with a feeding port, the bottom of the quick-freezing chamber is fixedly connected with a heat insulation material preparation bin, the bottom of the heat insulation material preparation bin is fixedly connected with a first material conveying pipe, and the first material conveying pipe is fixedly connected with a second material conveying pipe. A first material bin is fixedly connected to the bottom of the first material conveying pipe, a plurality of flow guide plates are fixedly connected to the inner walls of the two sides of the first material bin, a plurality of baffles are fixedly connected to the two sides of the inner walls of the flow guide plates, a second material conveying pipe is fixedly connected to the bottom of the first material bin, and a discharging assembly used for discharging is fixedly connected to the bottom of the second material conveying pipe. According to the device, a split-range microwave vacuum freezing drying mode is adopted, the freeze-drying efficiency of the device and the accuracy of drying power control are greatly improved, the drying quality of materials is improved, efficient, accurate and controllable drying operation is achieved, and the device has important significance on the development of the drying industry.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave drying, in particular to a split-step microwave freeze-drying device. Background Art

[0002] Agricultural products have a high moisture content after harvest. The moisture content of some fruit and vegetable products can reach more than 90% after harvest, which is not conducive to storage. Drying, as a way to reduce moisture content, can effectively reduce the impact of microorganisms, extend the storage period, and facilitate storage and transportation. It is widely used in the field of agricultural product storage and processing. Common drying methods include hot air drying, infrared drying, vacuum freeze drying, microwave drying, etc. Among them, vacuum freeze drying has good product quality, high rehydration rate, and can better retain the nutrients and flavor of food. Therefore, it is widely used in the food industry and is mostly used in new food research and development, functional food drying, and high-end product processing. However, the use of vacuum freeze drying technology alone has the disadvantages of long time and high energy consumption; microwave drying has the advantages of precision and high efficiency, volume heating, and strong penetration, but the main problem is that the drying uniformity is poor, which is easy to cause the "sharp corner effect" and the problem of material overheating and burning, affecting the quality of the dried product.

[0003] For the problems of drying agricultural products by a single drying method, the combined use of multiple drying methods can effectively make up for the shortcomings of a single method, improve drying efficiency, and improve drying quality. Common combined drying methods combined with microwave drying include microwave hot air drying, microwave spray drying, etc. Combined drying can significantly improve efficiency and shorten drying time, but there are still problems such as insufficient drying, poor product quality, and difficult to control the drying process. Therefore, a split-stage microwave freeze-drying device is proposed to solve the above problems. Summary of the invention

[0004] In order to make up for the above shortcomings, the utility model provides a split-stage microwave freeze-drying device, aiming to improve the problems of insufficient drying and poor product quality in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A split-step microwave freeze-drying device comprises a quick-freezing chamber, wherein a feed inlet is fixedly connected to the top of the quick-freezing chamber, an insulated material preparation bin is fixedly connected to the bottom of the quick-freezing chamber, a feed pipe 1 is fixedly connected to the bottom of the insulated material preparation bin, a material bin 1 is fixedly connected to the bottom of the feed pipe 1, a plurality of guide plates are fixedly connected to the inner walls of both sides of the material bin 1, a plurality of baffles are fixedly connected to the inner walls of the guide plates, a feed pipe 2 is fixedly connected to the bottom of the material bin 1, a discharge assembly for discharging material is fixedly connected to the bottom of the feed pipe 2, a microwave resonant cavity 2 is arranged outside the discharge assembly, a microwave source 2 is fixedly connected to the inner walls of both sides of the microwave resonant cavity 2, a driving assembly for suction is fixedly connected to the top left end of the microwave resonant cavity 2, a microwave resonant cavity 1 is arranged outside the material bin 1, a microwave source 1 is fixedly connected to the inner walls of both sides of the microwave resonant cavity 1;

[0007] As a further description of the above technical solution:

[0008] The discharge assembly includes a second material bin, the top of which is fixedly connected to the bottom of the second material delivery pipe, the bottom of which is fixedly connected to a sealed discharge valve, and the outside of the second material bin is fixedly connected to the inner wall of the second microwave resonance cavity;

[0009] As a further description of the above technical solution:

[0010] The driving assembly includes a vacuum tube, one end of which is fixedly connected to the top of the material bin one, the bottom of the right end of the vacuum tube is fixedly connected to the top of the microwave resonant cavity two, and the bottom of the vacuum tube is fixedly connected to a vacuum pump;

[0011] As a further description of the above technical solution:

[0012] An optical fiber temperature sensor 1 is fixedly connected to the inner wall of the material bin 1, and the quick freezing chamber is connected to the insulated material preparation bin via a sealed material control valve;

[0013] As a further description of the above technical solution:

[0014] The inner wall of the second material bin is fixedly connected with a second optical fiber temperature sensor.

[0015] The utility model has the following beneficial effects:

[0016] In the utility model, a drying method of split-stage microwave vacuum freezing is adopted, which greatly improves the freeze-drying efficiency of the device and the accuracy of drying power control, improves the drying quality of the material, and realizes efficient, accurate and controllable drying operation, which is of great significance to the development of the drying industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of a step-by-step microwave freeze-drying device according to an embodiment of the present invention.

[0018] Legend:

[0019] 1. Feed inlet; 2. Quick freezing chamber; 3. Sealed material control valve; 4. Insulated material preparation bin; 5. Microwave resonant cavity 1; 6. Material bin 1; 7. Material bin 2; 8. Guide plate; 9. Microwave source 1; 10. Sealed unloading valve; 11. Optical fiber temperature sensor 1; 12. Vacuum pump; 13. Feed pipe 1; 14. Microwave resonant cavity 2; 15. Microwave source 2; 16. Optical fiber temperature sensor 2; 17. Baffle; 18. Feed pipe 2; 19. Vacuum tube. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Reference Figure 1 The utility model provides an embodiment: a split-stage microwave freeze-drying device, comprising a quick-freezing chamber 2, a feed port 1 being fixedly connected to the top of the quick-freezing chamber 2, the quick-freezing chamber 2 utilizing advanced freezing technology to rapidly freeze the material to below its eutectic point, providing ideal pretreatment conditions for microwave freeze-drying, and keeping the original form of the material intact, an insulated material preparation bin 4 being fixedly connected to the bottom of the quick-freezing chamber 2, the quick-freezing chamber 2 being connected to the insulated material preparation bin 4 via a sealed material control valve 3, the insulated material preparation bin 4 being an efficient storage and buffer zone, keeping the material in a low temperature state, and accurately controlling the transmission of the material via the sealed material control valve 3 to avoid air pollution and temperature fluctuations.

[0022] A feed pipe 13 is fixedly connected to the bottom of the insulated preparation bin 4, and a material bin 6 is fixedly connected to the bottom of the feed pipe 13. The material bin 6 serves as a primary stage container for microwave drying, and receives pre-frozen materials from the insulated preparation bin 4 through the feed pipe 13 to prepare for the microwave drying process. A plurality of guide plates 8 are fixedly connected to the inner walls on both sides of the material bin 6, and a plurality of baffles 17 are fixedly connected to the inner walls of the guide plates 8 on both sides. The design of the guide plates 8 and the baffles 17 ensures that the material is evenly distributed in the material bin 6, thereby improving the drying efficiency and reducing local overheating or undried areas caused by uneven microwave radiation.

[0023] The bottom of the material bin 1 6 is fixedly connected with a feeding pipe 2 18, and the bottom of the feeding pipe 2 18 is fixedly connected with a discharge assembly for discharging materials. The discharge assembly is carefully designed to ensure that the material can smoothly transition to the next drying stage after completing the primary drying, without external operation, and has a high degree of automation. A microwave resonance cavity 2 14 is arranged on the outside of the discharge assembly. The discharge assembly includes a material bin 2 7. The top of the material bin 2 7 is fixedly connected to the bottom of the feeding pipe 2 18. The material bin 2 7 receives part of the dried material from the material bin 1 6, and the microwave source 2 15 in the microwave resonance cavity 2 14 continues to perform a deeper drying process on the material.

[0024] A sealed discharge valve 10 is fixedly connected to the bottom of the material bin 27, and the outside of the material bin 27 is fixedly connected to the inner wall of the microwave resonance cavity 2 14. The sealed discharge valve 10 remains sealed during the entire drying process until the drying is completed, ensuring the drying efficiency in a high vacuum environment and preventing the risk of microwave energy leakage and low-voltage discharge. Microwave sources 2 15 are fixedly connected to the inner walls of both sides of the microwave resonance cavity 2 14, and a driving component for suction is fixedly connected to the top left end of the microwave resonance cavity 2 14. The high efficiency and precise control of the microwave source 2 15, combined with the support of the driving component, make the entire drying process more uniform and controllable, thereby achieving an optimized drying effect.

[0025] The driving assembly includes a vacuum tube 19, one end of which is fixedly connected to the top of the material bin 6, and the bottom of the right end of the vacuum tube 19 is fixedly connected to the top of the microwave resonant cavity 2 14. The design and configuration of the vacuum tube 19 ensure that the material bin 16 and the material bin 27 operate under a high vacuum state, thereby optimizing the efficiency and quality of microwave drying. The bottom of the vacuum tube 19 is fixedly connected to a vacuum pump 12, and a microwave resonant cavity 5 is arranged outside the material bin 6. The high performance of the vacuum pump 12 ensures that the entire system operates under an appropriate vacuum state, and the microwave resonant cavity 5 provides uniform and continuous microwave energy to the material bin 6, thereby achieving efficient removal of water molecules.

[0026] The inner walls on both sides of the microwave resonant cavity 5 are fixedly connected with a microwave source 9, and the inner wall of the material bin 6 is fixedly connected with an optical fiber temperature sensor 11. The configuration of the microwave source 9 allows precise adjustment of the microwave energy. The optical fiber temperature sensor 11 monitors the temperature of the material during the drying process in real time to ensure that the quality of the material is not affected by overheating. The inner wall of the material bin 7 is fixedly connected with an optical fiber temperature sensor 16. The optical fiber temperature sensor 16 continues to monitor the temperature in the material bin 7 to provide necessary temperature data for the subsequent drying stage, thereby ensuring that the temperature of the entire drying process is under control and optimizing the final drying quality.

[0027] Working principle: First, the quick freezing chamber 2 is used to quickly pre-freeze the material. The material enters the quick freezing chamber 2 through the feed port 1. The efficient freezing system therein quickly reduces the temperature of the material to below its eutectic point, ensuring that the material maintains its original shape during the freeze-drying process and forms an ideal initial frozen state.

[0028] After quick freezing, the material is transferred to the insulated preparation bin 4 through the sealed material control valve 3. In this step, the insulated preparation bin 4 serves as a buffer zone to keep the material stored at a low temperature to prevent the temperature from rising during the transmission process, thereby affecting the freeze-drying effect.

[0029] Subsequently, the material is transported to the material bin 6 via the feed pipe 13. Inside the material bin 6, the alternating arrangement of multiple guide plates 8 and baffles 17 promotes uniform distribution of the material during the falling process. Such a layout helps to improve the uniformity of the microwave drying process and avoid local overheating or insufficient drying.

[0030] The material bin 6 is installed in the microwave resonant cavity 5. The microwave source 9 emits microwaves to penetrate the material and quickly sublime the moisture therein. The material bin 6 is also equipped with an optical fiber temperature sensor 11, which monitors the temperature of the material in real time to ensure that the quality of the material is not damaged due to overheating.

[0031] After completing primary drying, the material enters the next stage, namely the material bin 27, through the feed pipe 218. The material bin 27 is located in the microwave resonant cavity 214. The microwave source 215 provides lower intensity microwave radiation in this stage to analyze the remaining moisture in the material. The optical fiber temperature sensor 216 of the material bin 27 continues to monitor the temperature of the material to further ensure that the drying process is controlled within the optimal temperature range.

[0032] During the entire drying process, material bin 1 6 and material bin 2 7 are maintained in a high vacuum state, supported by a vacuum pump 12. This vacuum state is conducive to the effective transmission of microwaves and the rapid sublimation of water, thereby improving the drying efficiency and ensuring the quality of the final product. Finally, the fully dried material is discharged through the sealed discharge valve 10, completing the entire microwave freeze-drying process.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A split-stage microwave freeze-drying device, comprising a quick-freezing chamber (2), characterized in that: The top of the quick freezing chamber (2) is fixedly connected to a feed inlet (1), the bottom of the quick freezing chamber (2) is fixedly connected to an insulated material preparation bin (4), the bottom of the insulated material preparation bin (4) is fixedly connected to a feed pipe (13), the bottom of the feed pipe (13) is fixedly connected to a material bin (6), the inner walls on both sides of the material bin (6) are fixedly connected to a plurality of guide plates (8), the inner walls on both sides of the guide plates (8) are fixedly connected to a plurality of baffles (17), the bottom of the material bin (6) is fixedly connected to a feed pipe (2), and the inner walls on both sides of the guide plates (8) are fixedly connected to a plurality of baffles (17). (18), a discharge assembly for discharging materials is fixedly connected to the bottom of the second material conveying pipe (18), a microwave resonant cavity (14) is arranged outside the discharge assembly, and microwave sources (15) are fixedly connected to the inner walls on both sides of the microwave resonant cavity (14), and a driving assembly for suction is fixedly connected to the top left end of the second microwave resonant cavity (14), and a microwave resonant cavity (5) is arranged outside the first material bin (6), and microwave sources (9) are fixedly connected to the inner walls on both sides of the microwave resonant cavity (5).

2. A split-step microwave freeze-drying device according to claim 1, characterized in that: The discharge assembly comprises a second material bin (7), the top of the second material bin (7) being fixedly connected to the bottom of the second material delivery pipe (18), the bottom of the second material bin (7) being fixedly connected to a sealed discharge valve (10), and the outside of the second material bin (7) being fixedly connected to the inner wall of the second microwave resonance cavity (14).

3. A split-step microwave freeze-drying device according to claim 1, characterized in that: The driving assembly comprises a vacuum tube (19), one end of the vacuum tube (19) is fixedly connected to the top of the material bin one (6), the bottom of the right end of the vacuum tube (19) is fixedly connected to the top of the microwave resonant cavity two (14), and the bottom of the vacuum tube (19) is fixedly connected to a vacuum pump (12).

4. A split-step microwave freeze-drying device according to claim 1, characterized in that: An optical fiber temperature sensor (11) is fixedly connected to the inner wall of the material bin (6), and the quick freezing chamber (2) is connected to the insulated material preparation bin (4) via a sealed material control valve (3).

5. A split-step microwave freeze-drying device according to claim 2, characterized in that: The inner wall of the second material bin (7) is fixedly connected with a second optical fiber temperature sensor (16).

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