Microwave vacuum drying and sterilizing equipment for cake improver production

Abstract

The utility model relates to drying technical field especially relates to a kind of microwave vacuum drying sterilization equipment for cake improver production, including base and the drying cabinet of being fixed in the top of base, the drying cabinet includes: vacuum mechanism, feed inlet, discharge port, pivot, pivot is fixed with scraping component and multiple drying disc group, ultrasonic generator, microwave heating mechanism, porous reflector, hot blast, hot blast backflow port;The vacuum mechanism includes the honeycomb-like air extraction plate being set at the top of drying cabinet, the air extraction nozzle being set at the side of drying cabinet and being arranged in array, and the air extraction groove of guide type being set at the bottom of drying cabinet.This application's microwave vacuum drying sterilization equipment for cake improver production, while guaranteeing sterilization effect, can reduce the loss of active ingredient in material and improve its heating uniformity.

Description

Technical Field

[0001] This utility model relates to the field of drying technology, and in particular to a microwave vacuum drying and sterilization device for the production of pastry improvers. Background Technology

[0002] In the production process of pastry improvers, drying and sterilization are key steps affecting product quality. Pastry improvers typically contain functional ingredients such as enzymes, emulsifiers, and vitamins, which are quite sensitive to temperature.

[0003] Traditional pastry improvers are mainly dried and sterilized by hot air drying, spray drying or oven sterilization, but these methods have the following problems: (1) damage to temperature sensitivity: high temperature (usually >80℃) can easily deactivate heat-sensitive components and reduce the functionality of the product; (2) traditional heat conduction methods are slow to dry, have high energy consumption, and are prone to surface hardening and internal moisture residue; (3) hot air or steam sterilization has uneven temperature distribution, resulting in incomplete sterilization in some areas or local overheating.

[0004] Modern equipment has begun to adopt microwave drying and sterilization technology, utilizing its unique penetrating heating and selective temperature rise characteristics to improve the process. However, on the one hand, conventional vacuum systems cannot ensure uniform and stable air pressure within the drying chamber, resulting in significant differences in drying rates at different parts of the material; on the other hand, while pursuing drying efficiency, a single microwave heating mode often fails to adequately guarantee the retention of the activity of heat-sensitive components. Utility Model Content

[0005] To address the problems mentioned above, this invention provides a microwave vacuum drying and sterilization device for producing pastry improvers, which, while ensuring sterilization effectiveness, reduces the loss of active ingredients in the material and improves the uniformity of heating.

[0006] The solution adopted by this utility model to solve its technical problem is: a microwave vacuum drying and sterilization device for producing pastry improvers, comprising a base and a drying chamber fixed to the top of the base, wherein the drying chamber includes:

[0007] A vacuum mechanism is used to create a low-pressure environment inside the drying chamber; the vacuum mechanism includes a honeycomb-shaped suction plate disposed on the top of the drying chamber, suction nozzles arranged in an array on the side of the drying chamber, and a flow-guiding suction groove disposed at the bottom of the drying chamber.

[0008] The feed inlet is located at the top of the drying chamber; the discharge outlet is located at the bottom of the drying chamber.

[0009] A rotating shaft is vertically installed inside the drying chamber. A scraping assembly and multiple drying trays are fixed on the rotating shaft. Each drying tray assembly includes an odd number of drying trays and an even number of drying trays. The diameter of the even number of drying trays is larger than that of the odd number of drying trays. A baffle is provided on the outer side of the even number of drying trays, and an opening is provided on the inner side of the even number of drying trays. An ultrasonic transducer is embedded in the inner side of the odd number of drying trays.

[0010] A microwave heating mechanism, comprising a phase controller and four symmetrically arranged magnetrons controlled by the phase controller, wherein the phase controller and the magnetrons are both located inside a drying oven, and the waveguide outlet axis of the magnetrons forms a 15° angle with the horizontal plane;

[0011] The drying oven is equipped with a porous reflector.

[0012] A hot air outlet is located at the top of the drying chamber; a hot air return outlet is located at the bottom of the top of the drying chamber; both the hot air outlet and the hot air return outlet are equipped with guide plates, and spiral guide blades are provided on the outer side of the guide plates.

[0013] Furthermore, the scraper assembly is provided with elastic silicone fins at its bottom.

[0014] Furthermore, heat transfer strips are fixedly connected to the bottom of the even-numbered drying trays.

[0015] Furthermore, the aperture on the porous reflector has a gradient structure, with the aperture decreasing from top to bottom.

[0016] Through the above design, the large aperture at the top of the microwave vacuum drying and sterilization equipment allows more microwaves to penetrate, while the small aperture at the bottom enhances bottom reflection and compensates for energy attenuation.

[0017] Furthermore, the top of the elastic silicone fin is provided with a microwave reflective unit.

[0018] Furthermore, the surface of the elastic silicone fin is provided with grooves.

[0019] Through the above design, the elastic silicone fins can adhere to the top surface of the drying tray for scraping, generating elastic deformation and micro-vibration, which causes the adhesion layer on its surface to fatigue and fall off. The grooves change the contact between the fins and the material from a "continuous plane" to a "discrete point contact", reducing the adhesion force between the material and the fins and preventing material adhesion.

[0020] In summary, the beneficial effects of this utility model are as follows:

[0021] 1. The microwave vacuum drying and sterilization equipment of this application has a three-position air extraction structure. The top of the equipment is equipped with a honeycomb-shaped air extraction plate for air extraction, the side of the equipment is equipped with an array of air extraction nozzles for air pressure fine adjustment, and the bottom of the equipment is equipped with a flow guide type air extraction groove to guide part of the airflow to change direction. By establishing a three-dimensional dynamic balance vacuum environment, the moisture in all parts of the material can be continuously evaporated, reducing the problem of drying differences caused by uneven pressure inside the equipment.

[0022] 2. The microwave vacuum drying and sterilization equipment of this application heats and evaporates water molecules in the material through a microwave heating mechanism, and at the same time reduces the heat resistance of microorganisms through an ultrasonic transducer, thereby reducing the sterilization temperature requirement. Through the synergistic effect of microwave and ultrasound, the equipment can protect the functional components of the material while meeting the sterilization requirements.

[0023] 3. The microwave heating mechanism includes a phase controller and four sets of symmetrically arranged magnetrons. The phase controller can adjust the microwave phase difference of each set of magnetrons and control the superposition mode of electromagnetic waves, thereby changing the energy distribution of the microwave field, avoiding local overheating or cold areas, and improving energy utilization.

[0024] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a front view of the microwave vacuum drying and sterilization equipment in this embodiment;

[0026] Figure 2 This is a cross-sectional view of the microwave vacuum drying and sterilization equipment of this embodiment;

[0027] Figure 3 This is a front view of the microwave heating mechanism in this embodiment;

[0028] Figure 4 This is a front view of the scraper assembly in this embodiment;

[0029] Figure 5 for Figure 4 Enlarged view of section A;

[0030] Figure 6 This is a bottom view of the odd-numbered drying trays in this embodiment;

[0031] Figure 7 This is a bottom view of the even-numbered drying trays in this embodiment;

[0032] Figure 8This is a bottom view of the honeycomb-shaped air extraction plate in this embodiment.

[0033] In the diagram: 1. Base; 2. Drying oven; 211. Honeycomb exhaust plate; 212. Exhaust nozzle; 213. Guide-type exhaust groove; 22. Feed inlet; 23. Discharge outlet; 24. Rotating shaft; 241. Scraper assembly; 2411. Elastic silicone fins; 2412. Microwave reflector unit; 2413. Groove; 251. Odd-numbered drying trays; 252. Even-numbered drying trays; 261. Phase controller; 262. Magnetron; 27. Porous reflector; 28. Hot air outlet; 29. ​​Hot air return outlet; 3. Inner chamber; 4. Guide grid; 5. Spiral guide vanes; 7. Heat transfer strip; 8. Ultrasonic transducer. Detailed Implementation

[0034] To make the content of this utility model easier to understand, the present utility model will be further described below with reference to specific embodiments and accompanying drawings.

[0035] It should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer" used herein to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Unless otherwise stated, "a plurality of" means two or more.

[0036] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] like Figure 1 and Figure 2 As shown, a microwave vacuum drying and sterilization device for producing pastry improvers includes a base 1 and a drying chamber 2 fixed to the top of the base 1. The microwave vacuum drying and sterilization device in this embodiment is equipped with a control system, which integrates a PLC and a humidity sensor, enabling coordinated vacuum-microwave-ultrasound control. The control system is not shown in the figure.

[0038] The drying oven 2 of this application is equipped with a vacuum mechanism to create a low-pressure environment inside the drying oven 2. The vacuum mechanism includes a honeycomb-shaped suction plate 211 disposed at the top of the drying oven 2. The honeycomb-shaped suction plate 211 is connected to a suction pump at the top of the drying oven 2, enabling the suction pump to perform large-area suction and avoid localized dead zones in airflow. The honeycomb-shaped suction plate 211 is as follows... Figure 8 As shown. In addition, the drying chamber 2 is provided with an array of exhaust nozzles 212 on its side, which are connected to an external exhaust device. The bottom of the drying chamber 2 is also provided with a flow-guiding exhaust groove 213, which is used to guide the condensate out and prevent the material from adhering.

[0039] The drying chamber 2 has a feed inlet 22 at the top, which is equipped with a sealing cover, and a discharge outlet 23 at the bottom.

[0040] like Figure 4 As shown, the rotating shaft 24 is vertically installed inside the drying chamber 2 and driven by a servo motor, which is located at the bottom of the drying chamber 2 and rotates at 5-20 rpm. A scraper assembly 241 and multiple drying trays are fixed on the rotating shaft 24. The drying trays include alternating odd-numbered drying trays 251 and even-numbered drying trays 252. The odd-numbered drying trays 251 have a diameter of 600 mm. Figure 6 As shown, the top two odd-numbered drying trays 251 of this embodiment are embedded with 28kHz ultrasonic transducers 8. The ultrasonic cavitation effect generated by the ultrasonic transducers 8 can break down water molecule clusters, accelerate the migration of moisture from the inside of the material to the surface, and at the same time generate high-frequency vibration to prevent the powder material from sticking together and improve the drying uniformity.

[0041] like Figure 7 As shown, the even-numbered drying trays 252 have a diameter of 800 mm, an annular baffle, and a fan-shaped material passage. Several radially and axially arranged copper heat transfer strips 7 are welded to the bottom. In another embodiment, the bottom of the even-numbered drying trays 252 is provided with an asymmetrical trapezoidal fin array, the fin height increasing from the edge to the center. Through this design, the copper heat transfer strips 7 and trapezoidal fins of the even-numbered trays can conduct heat from the periphery of the even-numbered drying trays 252 to the inner periphery, making the material drying more uniform.

[0042] like Figure 2 and 3As shown, the drying oven 2 in this embodiment has an inner chamber 3, and a ceramic waveguide window is sealed on the inner chamber 3. A microwave heating mechanism is provided between the drying oven 2 and the inner chamber 3. The microwave heating mechanism includes a phase controller 261 and four symmetrically arranged magnetrons 262 controlled by the phase controller 261. The phase controller 261 and the magnetrons 262 are fixed inside the drying oven 2. The phase controller 261 controls the four symmetrically arranged magnetrons 262 to work alternately with a 90° phase difference. The waveguide outlet axis of the magnetron 262 forms a 15° angle with the horizontal plane. The microwaves generated by the magnetron 262 enter the inner chamber 3 through the ceramic waveguide window.

[0043] In this embodiment, the inner wall of the inner chamber 3, except for the ceramic waveguide window, is equipped with porous reflectors 27. The apertures on the porous reflectors 27 have a gradient structure, decreasing from top to bottom; specifically, the aperture gradually decreases from 3 mm to 1 mm. Through the above design, the drying chamber 2 of this embodiment can reflect long-path microwaves through the large aperture at the top and enhance the local field strength through the small aperture at the bottom, thereby adapting to the gradient changes in material humidity.

[0044] Hot air outlet 28 is located at the top of drying chamber 2; hot air return outlet 29 is located at the bottom of the top of drying chamber 2; both hot air outlet 28 and hot air return outlet 29 are provided with guide plates 4, and spiral guide vanes 5 are provided on the outside of the guide plates 4.

[0045] like Figure 5 As shown, the scraping assembly 241 has an elastic silicone fin 2411 at the bottom, a microwave reflective unit 2412 at the top of the elastic silicone fin 2411, and a groove 2413 on the surface of the elastic silicone fin 2411.

[0046] Through the above design, the microwave vacuum drying and sterilization equipment for producing pastry improvers in this embodiment can rapidly evaporate moisture from materials in a vacuum environment, avoiding damage to heat-sensitive components by high temperatures. At the same time, through vacuum combined with microwave and ultrasonic technology, microorganisms are efficiently inactivated.

[0047] The working process of the microwave vacuum drying and sterilization equipment in this embodiment is as follows: After the material enters through the feed inlet 22, it is evenly distributed on the drying trays by the scraping component 241 under vacuum. Odd-numbered trays are dehydrated with ultrasonic assistance, while even-numbered trays utilize baffles to extend the material residence time. Microwaves form a standing wave field through the reflector, which, together with the 15° inclined waveguide, achieves three-dimensional heating. The hot air system and the heat transfer strip 7 work together to eliminate local temperature differences, and the final product is discharged through the discharge port 23.

[0048] It is important to note that this equipment primarily utilizes vacuum-microwave-ultrasound technology, with hot air serving as an optional auxiliary method. The main steps are as follows: Vacuuming is performed to lower the boiling point of water, allowing it to evaporate rapidly at low temperatures; microwaves and ultrasound work simultaneously, with microwaves providing volumetric heating and ultrasound cavitation assisting moisture migration. Due to the extremely low heat transfer efficiency in a vacuum environment, hot air is not introduced during this stage; once the material's moisture content drops to a critical value, partial depressurization is performed, and hot air is introduced to further remove residual moisture using convection. If the material is highly heat-sensitive (e.g., containing active enzymes), the entire process is maintained under vacuum, relying solely on microwaves and ultrasound to complete the drying process.

[0049] The embodiments described above are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and modifications made by those skilled in the art based on this utility model shall fall within the scope of protection of this utility model.

Claims

1. A microwave vacuum drying and sterilization device for producing pastry improvers, comprising a base and a drying chamber fixed to the top of the base, characterized in that, The drying oven includes: A vacuum mechanism is used to create a low-pressure environment inside the drying chamber; the vacuum mechanism includes a honeycomb-shaped suction plate disposed on the top of the drying chamber, suction nozzles arranged in an array on the side of the drying chamber, and a flow-guiding suction groove disposed at the bottom of the drying chamber. The feed inlet is located at the top of the drying chamber; the discharge outlet is located at the bottom of the drying chamber. A rotating shaft is vertically installed inside the drying chamber. A scraping assembly and multiple drying trays are fixed on the rotating shaft. Each drying tray assembly includes an odd number of drying trays and an even number of drying trays. The diameter of the even number of drying trays is larger than that of the odd number of drying trays. A baffle is provided on the outer side of the even number of drying trays, and an opening is provided on the inner side of the even number of drying trays. An ultrasonic transducer is embedded in the bottom of the odd number of drying trays. A microwave heating mechanism, comprising a phase controller and four symmetrically arranged magnetrons controlled by the phase controller, wherein the phase controller and the magnetrons are both located inside a drying oven, and the waveguide outlet axis of the magnetrons forms a 15° angle with the horizontal plane; The drying oven is equipped with a porous reflector. A hot air outlet is located at the top of the drying chamber; a hot air return outlet is located at the bottom of the top of the drying chamber; both the hot air outlet and the hot air return outlet are equipped with guide plates, and spiral guide blades are provided on the outer side of the guide plates.

2. The microwave vacuum drying and sterilization equipment for producing pastry improvers according to claim 1, characterized in that, The scraper assembly has elastic silicone fins at its bottom.

3. The microwave vacuum drying and sterilization equipment for producing pastry improvers according to claim 1, characterized in that, The bottom of the even-numbered drying trays is fixedly connected to heat transfer strips.

4. The microwave vacuum drying and sterilization equipment for producing pastry improvers according to claim 1, characterized in that, The aperture on the porous reflector has a gradient structure, with the aperture decreasing from top to bottom.

5. The microwave vacuum drying and sterilization equipment for producing pastry improvers according to claim 2, characterized in that, The elastic silicone fins are equipped with microwave reflective units on their top surfaces.

6. The microwave vacuum drying and sterilization equipment for producing pastry improvers according to claim 2, characterized in that, The surface of the elastic silicone fin is provided with grooves.

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