CN116481266A - Negative pressure low temperature internal circulation fruit and vegetable drying system - Google Patents

Negative pressure low temperature internal circulation fruit and vegetable drying system Download PDF

Info

Publication number
CN116481266A
CN116481266A CN202310480621.3A CN202310480621A CN116481266A CN 116481266 A CN116481266 A CN 116481266A CN 202310480621 A CN202310480621 A CN 202310480621A CN 116481266 A CN116481266 A CN 116481266A
Authority
CN
China
Prior art keywords
drying
box
vegetable
fruit
negative pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310480621.3A
Other languages
Chinese (zh)
Inventor
王东生
王敏
梁毅诚
张正宝
覃月燕
莫禧光
徐强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi Dikai Science & Technology Co ltd
Original Assignee
Guangxi Dikai Science & Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi Dikai Science & Technology Co ltd filed Critical Guangxi Dikai Science & Technology Co ltd
Priority to CN202310480621.3A priority Critical patent/CN116481266A/en
Publication of CN116481266A publication Critical patent/CN116481266A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/003—Handling, e.g. loading or unloading arrangements for articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/009—Alarm systems; Safety sytems, e.g. preventing fire and explosions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/08—Parts thereof
    • F26B25/12—Walls or sides; Doors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/14—Chambers, containers, receptacles of simple construction
    • F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/85—Food storage or conservation, e.g. cooling or drying

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A negative pressure low temperature internal circulation fruit and vegetable drying system, a plurality of drying box units are placed on a support, the tail end of an air outlet pipeline of each drying box is connected to a liquid collecting tank through a vacuum pipeline, a condensing system is arranged in the middle of the pipeline, the liquid collecting tank is connected with a vacuum pump, and an electromagnetic heater is arranged at the bottom of each drying box. Can produce two products of fruit and vegetable dried food and fruit and vegetable pure dew at one time, improves the freshness and quality preservation and other purposes of the products, and increases the added value of the products. And adopt flat electromagnetic heating drying unit structure, comprehensively adopt electromagnetic heating and hot-blast heating combined stoving form, improved drying efficiency by a wide margin. The system is provided with an intelligent control system, can collect temperature and humidity, vacuum degree and fruit and vegetable water content value inside the drying box, and can realize linkage control of a heating and circulating control module, a vacuumizing control module, an automatic box door opening and closing control module, a sample observation window and an image recognition module, so that the set box environment is finally achieved.

Description

Negative pressure low temperature internal circulation fruit and vegetable drying system
Technical Field
The invention relates to the technical field of primary agricultural product processing equipment, in particular to a negative pressure low-temperature internal circulation fruit and vegetable drying system.
Background
The dried fruit and vegetable food is a fresh-keeping and quality-keeping food obtained by dehydrating fruits and vegetables, maintains the color, fragrance and taste of the original vegetables and fruits, increases the crisp and delicious taste, can overcome the defects of difficult storage and seasonality of the fresh fruits and vegetables, and is popular among the public. The existing fruit and vegetable drying equipment generally uses hot air and low temperature to freeze, then carries out vacuum heating drying and microwave drying, and discharges the moisture in the fresh fruits and vegetables to obtain the fruit and vegetable dry food.
However, the existing fruit and vegetable drying equipment has the following defects: 1. the fruit and vegetable drying equipment usually only has one product at last, namely dried fruit and vegetable food is obtained; however, in the drying process of the fruits and vegetables, some components are taken away by the dried water vapor, such as the fragrance components of the fruits and vegetables, and the fragrance components in the fruits and vegetables are also important components of the flavor of the fruits and vegetables, if the dried steam of the fruits and vegetables can be collected and utilized, the higher product value can be realized. 2. Most of the existing fruit and vegetable drying equipment adopts a tank type or box type structure, a plurality of layers of trays are placed in the inner cavity, fruits and vegetables to be dried are placed in the trays, the inner cavity adopts a heating mode such as hot air circulation and the like, moisture in fruit and vegetable cells is taken away, and finally a fruit and vegetable dried product is obtained. Such drying equipment is relatively bulky; secondly, the hot air circulates in a huge box body to easily generate dead zones, so that the drying effect is uneven, and the final taste uniformity of the product is affected. 3, when the amount of the dried batches of fruits and vegetables is small, the drying cost is high by adopting a large box body, the requirement of small-amount production is not facilitated, the drying time is long (for example, the drying time of the star anise is more than 24 to 48 hours), and the cost is high; 4. the control automation degree is not high, the control of the existing control system on the drying environment is not accurate and reliable enough, and the drying environment is not stable and controllable enough.
The existing literature on fruit and vegetable drying is retrieved as follows:
1. fruit and vegetable vacuum drying equipment easy to clean; CN202021348449.4; 2. an aromatic plant drying and pure dew extracting device; CN201320132269.6; 3. drying box of negative pressure dehumidification thermal cycle, CN 103575072.A: 4. drying device and method for effectively improving retention rate of vitamin C in dried fruit and vegetable products; CN201710709417.9; 5. a fruit and vegetable cleaning and drying device; 202220807374.4, etc.
Although various food negative pressure drying devices are disclosed in the prior art, the prior art does not have the related technology of a unitized drying system, has lower automation degree and higher energy consumption, and cannot realize the production of the dried fruit and vegetable food with high efficiency and flexibility; in addition, there is no disclosure of a conventional document that uses electromagnetic induction heating in combination with hot air drying.
Disclosure of Invention
A negative pressure low temperature internal circulation fruit and vegetable drying system can produce fruit and vegetable dried food and fruit and vegetable pure dew at one time, the pure dew collection rate reaches more than 80%, the freshness, quality and other purposes of the products are improved, and the added value of the products is increased. And adopt flat electromagnetic heating drying unit structure, comprehensively adopt electromagnetic heating and hot-blast heating combined stoving form, improved drying efficiency by a wide margin.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the negative pressure low temperature internal circulation fruit and vegetable drying system comprises a plurality of drying box units, wherein the drying box units are arranged on a support, the tail end of an air outlet pipeline of each drying box is connected to a liquid collecting tank through a vacuum pipeline, a condensing system is arranged in the middle of the pipeline, the liquid collecting tank is connected with a vacuum pump, and an electromagnetic heater is arranged at the bottom of each drying box.
According to the evaporation characteristic of fruit and vegetable liquid, the evaporation temperature of the liquid is 100 ℃ under standard atmospheric pressure, and the essence of fruits and vegetables can be destroyed by high-temperature evaporation at 100 ℃, in order to reduce the evaporation temperature, the evaporation is carried out by adopting a negative pressure low-temperature mode, the boiling evaporation temperature of the fruits and vegetables is reduced to below 70 ℃, and the moisture of the fruits and vegetables can be rapidly boiled and evaporated at below 70 ℃, so that the original quality of the fruits and vegetables is saved, the effect of rapid drying is achieved, and the drying time and the drying cost are saved. According to the invention, a negative pressure environment of 0.01-0.03MPa is formed in the inner cavity of the box body by utilizing the principle, and the temperature in the box is kept to be uniformly below 70 ℃ for drying under the action of the heater and the internal circulation, so that the best quality of fruit and vegetable products is obtained. The evaporated fruit and vegetable steam is collected by a condenser to form pure dew, and precious byproducts after drying fruit and vegetable products are obtained. The formation of negative pressure in the negative pressure box is controlled by a vacuum pump, an electromagnetic heater is arranged at the bottom of the outer part of the negative pressure box, a hot air device is arranged at the inner side of the box door, and the heating environment in the box is obtained through an electromagnetic heating and hot air drying mode.
The condensing unit includes cooling coil pipe closely installed to the outer surface of the vacuum pipeline, and the cooling coil pipe may pass through liquid cooling medium and is connected to refrigerating apparatus, which may be compression refrigerator, or cold source.
The drying box is flat and horizontally arranged on the electromagnetic heater, and the two ends of the drying box are provided with box doors.
When the fruits and vegetables are dried, the fruits and vegetables to be dried can be placed in the tray firstly, then the tray is placed at the bottom of the inner cavity of the drying box, and the tray is not needed, so that the fruits and vegetables to be dried are directly paved on the bottom plate of the inner cavity of the drying box. After the electromagnetic heater is started, the electromagnetic coil is electrified to generate a changing magnetic field, so that vortex heating is generated on metal, the bottom plate of the drying box contacting the electromagnetic coil is continuously heated until the temperature of the inner cavity of the whole drying box is raised, hot air drying of the inner cavity of the drying box is assisted, moisture of fruits and vegetables is quickly evaporated, and the upper surface of the fruits and vegetables is heated and dried in an internal hot air circulation mode, so that the moisture of the fruits and vegetables is quickly removed.
The inner cavity of the drying box is provided with a plurality of reinforcing members, the reinforcing members partition the inner cavity of the drying box into a plurality of spaces, the spaces of the reinforcing members can movably hold trays, and a plurality of gas guide grooves are formed in the reinforcing members.
The reinforcement is used for supporting the inner cavity of the flat drying box without deformation, so that the thickness of the wall of the box is reduced, and the manufacturing cost is obviously reduced.
The outside of the drying box is provided with a heat insulation layer, the heat insulation layer is integrally wrapped with the electromagnetic heater at the bottom of the heat insulation layer from the periphery, and a circuit control module of the electromagnetic heater is arranged outside the heat insulation layer. The heat insulation layer keeps the heat of the inner cavity not easy to dissipate, and energy consumption is saved. The bottom of the tray is contacted with a stainless steel plate at the bottom of the drying box body, an insulating plate is arranged below the steel plate at the bottom of the box body, and an electromagnetic coil is arranged below the insulating plate.
And each station on the inner side of the box door is provided with a hot air device to form an array, and the hot air device comprises a fan and a heater. The hot air device consists of a fan and a heater, the heater can be an electric heating pipe or an electric heating wire, hot air is blown into the inner cavity of the box body to form internal circulation hot air, and moisture on the upper surface of the fruits and vegetables is quickly transpired; the fruit and vegetable are matched with an electromagnetic heater up and down, and the fruit and vegetable are dried rapidly; the hot air devices are arranged back and forth, so that the hot air volume in the cavity is uniform.
The box door is provided with an electric control opening and closing device, the opening and closing device is controlled by an opening and closing controller, a base of the opening and closing device is fixed on the shell, the root of a movable arm of the opening and closing device is hinged with the base, and the free end of the movable arm is fixedly connected with the outer wall of the box door. The movable arm of the opening and closing device can be driven by the top of the cylinder to open the box door, and the cylinder is contracted to drive the box door to be pressed down to close the box door.
The working principle of the invention is as follows:
according to the invention, the evaporation temperature of the liquid is 100 ℃ under a standard atmospheric pressure according to the evaporation characteristic design of the fruit and vegetable liquid, and the essence of fruits and vegetables can be destroyed by high-temperature evaporation at 100 ℃, so that in order to reduce the evaporation temperature, the evaporation is carried out by adopting a negative pressure low-temperature mode, the boiling evaporation temperature of the fruits and vegetables is reduced to below 70 ℃, and the moisture of the fruits and vegetables below 70 ℃ can be rapidly boiled and evaporated, so that the original quality of the fruits and vegetables is saved, the effect of rapid drying is achieved, and the drying time and the drying cost are saved. According to the invention, a negative pressure environment of 0.01-0.03MPa is set by utilizing the principle, the temperature in the box is kept to be even below 70 ℃ under the action of the heater and the internal circulation, and the quality of the obtained fruit and vegetable products is the best state. The evaporated fruit and vegetable steam is collected by a condenser to form pure dew, and precious byproducts after drying fruit and vegetable products are obtained. The formation of negative pressure in the negative pressure box is controlled by a vacuum pump, an electromagnetic heating mode is arranged at the outer bottom of the negative pressure box, and the heating environment in the box is obtained through the electromagnetic heating mode.
The working principle of the control system of the invention is as follows:
the inner cavity of each drying box is provided with a temperature and humidity acquisition module and a fruit and vegetable water content acquisition module, the temperature and humidity acquisition module and the fruit and vegetable water content acquisition module are respectively in signal connection with an external communication module, and the communication module is in signal connection with a data display and control module. The data display and control module is connected with the industrial control PLC, the relay and the data display screen; the communication module is RS485 and is provided with a signal interface connected with a plurality of devices; the temperature and humidity acquisition module comprises a thermocouple temperature probe and an SHT40 humidity probe which extend into the inner cavity of the box body, the thermocouple temperature probe and the SHT40 humidity probe are connected with the temperature and humidity inspection instrument through wires, the temperature and humidity inspection instrument is connected with the PLC through signals, signals acquired by the temperature and humidity are transmitted to the temperature and humidity inspection instrument, the temperature and humidity inspection instrument processes the signals and then transmits the signals to the communication module, and the communication module converts 485 signals into TCP network signals and transmits the TCP network signals to the PLC and displays the TCP network signals on a screen.
The electromagnetic heater is controlled by an electromagnetic heating control module, and the electromagnetic heating control module is in signal connection with the communication module. The rated power of the electromagnetic heater can be selected to be 2-16 kW, the working voltage is 380V, after the electromagnetic heater is started, the electromagnetic coil is electrified to generate a changing magnetic field, so that eddy current heating is generated on metal, the tray is continuously heated and dried, fruits and vegetables in the tray are spread, and moisture is continuously emitted from the fruits and vegetables; the PLC transmits the detected temperature and humidity signals to the communication module and the electromagnetic heater, and the heating power of the electromagnetic heater is controlled by controlling the electromagnetic heating module so as to enable the temperature in the drying box to reach a preset value.
The opening and closing mechanism is driven by a cylinder arranged on the drying box, the cylinder is controlled by a box door opening and closing control module, and the box door opening and closing control module is connected with the communication module through signals. After the time or the dryness reaches the requirement, the fruit and vegetable water content acquisition module sends a signal to the PLC control program, the PLC sends a command to the electromagnetic valve, the electromagnetic valve sends an action command to the air cylinder, and the air cylinder acts to open the box door; after the cylinder is in place, a travel switch sensor senses a signal and feeds the signal back to the PLC, and the PLC gives a stop command action.
The vacuum pipeline is internally provided with a vacuum degree acquisition module, the vacuum degree acquisition module is in signal connection with a communication module, the communication module is in signal connection with a vacuum degree control module, and the vacuum pump is controlled by the vacuum degree control module. The electronic vacuum gauge is connected to the inner cavity of the detected box body through the configuration connecting pipe, after the electronic vacuum gauge detects that the vacuum degree in the box body accords with a set value, an electronic signal is sent to the PLC control module, the PLC control module gives an instruction to the vacuum pump power supply controller, the vacuum pump stops pumping, and when the vacuum degree in the box body is higher than the set value, the PLC control module gives the instruction to the vacuum pump power supply controller, and the vacuum pump is started to continue to work.
The internal circulation hot air device is controlled by an internal circulation control module which is in signal connection with the communication module. The fan and the heating wire are independently separated from a power supply circuit, so that hot air and cold air can be independently controlled. The control panel sets a temperature value, and the heating wire and the fan are operated simultaneously after the power-on. The temperature probe detects the temperature and feeds back information to the PLC through the communication module. When the temperature reaches the set value, the temperature probe transmits the detected data to the PLC, the PLC judges the value to be more than or equal to the set value, the PLC gives a stop instruction and transmits the stop instruction to the power supply controller of the heating wire and the fan, the heating wire stops working, and the fan continues to operate. When the temperature is lower than the set value, the PLC gives an operation instruction and transmits the operation instruction to a controller of the heating wire and the fan, the heating wire starts to work, and the fan keeps running.
The communication module is also in signal connection with the alarm module. The alarm module comprises a buzzer and a warning lamp, when the acquired value exceeds a preset threshold value, the PLC sends a signal to the alarm module through the communication module, the buzzer sends an alarm, and the warning lamp flashes.
The invention has the advantages that:
1. the invention can realize one-time production of two products, namely fruit and vegetable dry food and fruit and vegetable pure dew, the pure dew collection rate reaches more than 80%, the freshness and quality preservation and other purposes of the products are improved, and the added value of the products is increased. The obtained fruit and vegetable pure dew is pure and pollution-free, and can be used for various food processing and other industrial products, such as beverage, sauce, fruit wine, cosmetics, etc.
2. The invention adopts a negative pressure low-temperature drying process to realize a negative pressure environment with the air pressure of 0.01-0.03MPa in the drying box body, so that the boiling evaporation temperature is reduced to below 70 ℃, and the moisture of fruits and vegetables below 70 ℃ can be quickly boiled and evaporated, thereby preserving the original quality of the fruits and vegetables, also achieving the effect of quick drying, enabling various fruits and vegetables to reach the required dryness in 4-8 hours, and greatly saving the drying time and the drying cost.
3. The heat insulation layer is arranged outside the drying box body and the heater at the bottom, so that heat dissipation can be reduced, electric energy consumption in the drying process is reduced, and production cost is saved.
4. The invention adopts a mode that a plurality of drying boxes share one set of vacuumizing and condensing system, thereby increasing the space utilization rate.
5. Under the condition of realizing the same vacuum degree and space utilization rate of the inner cavity of the drying box, a plurality of small drying boxes replace a large drying box design, and the small drying boxes are provided with inner wall interlayer to replace external reinforcing ribs, so that the thickness of the wall of the box body is reduced, and the manufacturing cost is obviously reduced.
6. The invention adopts an electromagnetic heating mode, can reach the required temperature within 1 hour of heating, has high heat conversion efficiency, and is safer and more energy-saving.
7. The multiple boxes are independently designed, so that multiple materials can be dried simultaneously, or a plurality of groups of drying boxes are selected for independent use, the drying box is more flexible and convenient, is suitable for small-scale production and drying requirements, and is simpler in process realization and maintenance.
8. The invention can realize two working modes of low pressure and normal pressure, and completes the procedures of de-enzyming and sterilizing fruits and vegetables to be dried at high temperature (100 ℃) under normal atmospheric pressure.
9. The control system adjusts the heating power of electromagnetic heating and hot air circulation in real time by detecting the change of various parameters in the drying box; the vacuum degree in the detection system is used for adjusting the opening and closing of the vacuum pump in real time, so that the whole fruit and vegetable drying equipment can carry out drying operation in a stable and controllable environment.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention (door open state);
FIG. 2 is an enlarged view of the structure at I in FIG. 1;
FIG. 3 is a schematic view of the overall structure of the present invention (door closed state);
FIG. 4 is an enlarged view of the result at II in FIG. 3;
fig. 5 is a diagram showing the structure of the inside of the drying box;
FIG. 6 is a partial sectional view of the oven housing;
FIG. 7 is a schematic diagram of signal connections of a control system;
the part name in the figure is: 1-a drying box; 11-door; 12-a hot air device; 13-reinforcement; 14-opening and closing means; 15-a bottom plate of a drying box; 2-a bracket; 3-an electromagnetic heater; 31-an insulating plate; a 32-coil; 4-a tray; 5-a liquid collection tank; 6-a condensing system; 61-an air outlet pipe; 62-vacuum tubing; 7-a vacuum pump; 8-a heat insulation layer; 9-a data display and control module; 91-a temperature and humidity acquisition module; 92-a water content acquisition module; 93-vacuum degree acquisition module.
Detailed Description
Example 1
The negative pressure low temperature internal circulation fruit and vegetable drying system is characterized in that drying boxes 1 are arranged on a bracket 2, the tail end of an air outlet pipeline of each drying box 1 is connected to a liquid collecting tank 5 through a vacuum pipeline respectively, a condensing system 6 is arranged in the middle of the pipeline, and refrigerating equipment is a compression refrigerator or cold water; the liquid collection tank 5 is connected with a vacuum pump 7, and an electromagnetic heater 3 is arranged at the outer bottom of the drying box 1;
the drying box 1 is flat in shell shape and is horizontally placed on the electromagnetic heater 3, and the box doors 11 are arranged at any two ends of the drying box 1 opposite to the doors and are used for feeding and discharging in production operation.
The inner cavity of the drying box 1 is provided with a plurality of box body reinforcing members 13, the inner cavity of the drying box 1 is partitioned into a plurality of spaces by the reinforcing members 13, each space is used for independently placing a tray 4, the tray 4 can be pushed in and pulled out in a drawer mode, the dried fruits and vegetables are flatly placed on the tray 4, and a plurality of gas guide grooves are formed in the reinforcing members 13; the reinforcement 13 forms an interior wall from bottom of the case portion to top, has played supporting reinforcement effect to stoving case 1 from the multi-angle, prevents that the box from warping in negative pressure environment, and gas guide way then makes each independent space in the stoving case 1 intracavity communicate with each other, helps the integral type to accomplish the negative pressure operation of taking out fast, simultaneously, under hot-blast device's effect, can also make the incasement form good inner loop action, helps improving fruit vegetables moisture evaporation rate, shortens stoving time.
The heat insulation layer 8 wraps the drying box 1 together with the electromagnetic heater 3 at the bottom of the drying box from the periphery, the box door is independently wrapped, the drying box is convenient to open and close, and a circuit control module of the electromagnetic heater 3 is arranged outside the wrapping layer. The heat insulation layer wraps up and plays the heat of box reduces outwards gives off at stoving in-process, and concentrated heat gives off the bottom tray of hugging closely electromagnetic heater in the case, improves heat energy utilization.
Each station on the inner side of the box door 11 is provided with a hot air device 12 to form an array, and the hot air devices 12 comprise fans and heaters. The heater is installed in the direction of the air supply port of the hot air device 12.
The inner cavity of the drying box 1 is connected with a temperature and humidity acquisition module 91 and is in signal connection with a data display and control module 9.
The inner cavity of the drying box 1 is connected with a water content acquisition module 92 and is in signal connection with a data display and control module 9.
The vacuum pipeline 62 is connected with a vacuum degree acquisition module 93 and is in signal connection with the data display and control module 9.
The circuit control module of the electromagnetic heater 3 is respectively connected with the temperature control module, the data display and control module 9 by signals.
The hot air device 12 is respectively connected with the temperature control module, the data display and control module 9 in a signal way.
The vacuum pump 7 is respectively connected with the temperature control module, the data display and control module 12 in a signal way.
The inner cavity of the drying box 1 is provided with an illuminating lamp, the brightness of the interior of the drying box 1 is improved, and the interior of the drying box is conveniently observed through the image recognition module on the observation window.
The box door 11 is provided with an electric control opening and closing device which is controlled by an opening and closing controller, and the opening and closing controller is in signal connection with a data display and control module 12.
The invention can collect the values of temperature, humidity, vacuum degree and fruit and vegetable water content in the drying box in real time through the data display and control module 12, compares the obtained values with the threshold value set by the system in real time, then links the circuit control module of the electromagnetic heater 3, the hot air device 12 and the vacuum pump 7 according to the comparison result to perform corresponding regulation and control actions, and finally realizes the working environment of the inner cavity of the box body.
For example, the temperature in the tank is set to50At a temperature of over50When the temperature in the box is restored to the set value, each control module restores the previous working state.
For example, the air pressure in the tank is set to be 0.01-0.03MPaAt a certain set value of (2)When the atmospheric pressure value in the box reaches a set value, the temperature control module instructs the vacuum pump 7 to be shut down, and otherwise, the working state is started.
For example, if the moisture content of the dried longan is required to be set to be below 35%, the moisture content of the dried octal is required to be below 10%, and the moisture content of the dried banana is required to be below 5%, when the set threshold values are collected by the fruit and vegetable moisture content collection module, the drying system automatically stops working, and data intellectualization is achieved.
Application examples:
taking 1000 and kg octagon for example, the ambient temperature is 29℃:
taking the embodiment 1 as an embodiment, five drying unit devices are used, about 200kg of octagon to be dried is placed in each drying box unit, the octagon is dried until the water content value is less than or equal to 10%, the air pressure value is set to be 0.02MPa, and parameters such as drying time, drying electricity consumption and the like are measured.
The comparative example is a normal pressure hot air drying technology drying equipment, the drying equipment is a large drying room of the Asahi mechanical equipment Limited company in Fujian, the model ZX-15P, and the drying is carried out by adopting a heat pump hot air drying principle. The space of the inner cavity is provided with 6 groups of 8 layers, and the total number of the drying net trays is 6 multiplied by 8=48.
The drying results are shown in the following table:
therefore, the fruit and vegetable drying device has great advantages in drying efficiency and power consumption compared with main flow fruit and vegetable drying equipment in the market.

Claims (9)

1. A negative pressure low temperature internal circulation fruit vegetables drying system, its characterized in that: a plurality of drying boxes (1) are placed on the support (2), the tail end of an air outlet pipeline (61) of each drying box (1) is connected to a liquid collecting tank (5) through a vacuum pipeline (62), a condensing system (6) is arranged in the middle of the pipeline, the liquid collecting tank (5) is connected with a vacuum pump (7), and an electromagnetic heater (3) is arranged at the bottom of each drying box (1).
2. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 1, wherein: the drying box (1) is flat and is horizontally placed on the electromagnetic heater (3), and the box doors (11) are arranged at two ends of the drying box (1).
3. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 1, wherein: the inner cavity of the drying box (1) is provided with a plurality of reinforcing members (13), the inner cavity of the drying box (1) is partitioned into a plurality of spaces by the reinforcing members (13), the space of the drying box is movably provided with a tray (4), and a plurality of gas guide grooves are formed in the reinforcing members (13).
4. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 1, wherein: the drying box (1) is provided with a heat insulation layer (8), the heat insulation layer (8) is integrally wrapped with the electromagnetic heater (3) at the bottom of the drying box from the periphery, and a circuit control module of the electromagnetic heater (3) is arranged outside the heat insulation layer (8).
5. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 2, wherein: and a hot air device (12) is arranged on each station on the inner side of the box door (11) to form an array, and the hot air device (12) comprises a fan (121) and a heater (122).
6. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 1, wherein: the inner cavity of the drying box (1) is connected with a temperature and humidity acquisition module (91) and is connected with a data display and control module (9) in a signal mode.
7. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 1, wherein: the inner cavity of the drying box (1) is connected with a water content acquisition module (92) and is connected with a data display and control module (9) in a signal way.
8. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 1, wherein: the vacuum pipeline (62) is connected with a vacuum degree acquisition module (93) and is connected with a data display and control module (9) in a signal mode.
9. The negative pressure low temperature internal circulation fruit and vegetable drying system according to claim 2, wherein: the box door (11) is provided with an opening and closing device (14), the opening and closing device (14) is controlled by a box door opening and closing control module, and the box door opening and closing control module is connected with the data display and control module (9) through signals.
CN202310480621.3A 2023-04-28 2023-04-28 Negative pressure low temperature internal circulation fruit and vegetable drying system Pending CN116481266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310480621.3A CN116481266A (en) 2023-04-28 2023-04-28 Negative pressure low temperature internal circulation fruit and vegetable drying system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310480621.3A CN116481266A (en) 2023-04-28 2023-04-28 Negative pressure low temperature internal circulation fruit and vegetable drying system

Publications (1)

Publication Number Publication Date
CN116481266A true CN116481266A (en) 2023-07-25

Family

ID=87224899

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310480621.3A Pending CN116481266A (en) 2023-04-28 2023-04-28 Negative pressure low temperature internal circulation fruit and vegetable drying system

Country Status (1)

Country Link
CN (1) CN116481266A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6871374A (en) * 1974-05-15 1975-11-13 Gelder A V Vacuum dehydration
DE19808408C1 (en) * 1998-02-27 1999-06-24 Bernd Dreisbach Vacuum dry cabinet
CN2539947Y (en) * 2002-05-07 2003-03-12 张庆玉 Vacuum heat flow low temp. dewatering drying fresh-keeping device
CN101936645A (en) * 2010-09-30 2011-01-05 昆山康和电子科技有限公司 Vacuum drying box
CN204830044U (en) * 2015-08-21 2015-12-02 河北火友炉业科技有限公司 Heating stove wind channel and corresponding heating stove wind channel body, heating stove
CN207395299U (en) * 2017-06-28 2018-05-22 长沙开元仪器股份有限公司 A kind of combination automatic vacuum drying box
CN110513967A (en) * 2019-09-11 2019-11-29 山东润品源食品股份有限公司 One kind being used for garden stuff processing Minton dryer
CN210625124U (en) * 2019-09-28 2020-05-26 合肥金尼克机械制造有限公司 Low-temperature vacuum drying cabinet
CN112760172A (en) * 2021-02-05 2021-05-07 贵阳新奇微波工业有限责任公司 Device and method for collecting flower aromatic water through low-temperature microwave heating and condensation

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6871374A (en) * 1974-05-15 1975-11-13 Gelder A V Vacuum dehydration
DE19808408C1 (en) * 1998-02-27 1999-06-24 Bernd Dreisbach Vacuum dry cabinet
CN2539947Y (en) * 2002-05-07 2003-03-12 张庆玉 Vacuum heat flow low temp. dewatering drying fresh-keeping device
CN101936645A (en) * 2010-09-30 2011-01-05 昆山康和电子科技有限公司 Vacuum drying box
CN204830044U (en) * 2015-08-21 2015-12-02 河北火友炉业科技有限公司 Heating stove wind channel and corresponding heating stove wind channel body, heating stove
CN207395299U (en) * 2017-06-28 2018-05-22 长沙开元仪器股份有限公司 A kind of combination automatic vacuum drying box
CN110513967A (en) * 2019-09-11 2019-11-29 山东润品源食品股份有限公司 One kind being used for garden stuff processing Minton dryer
CN210625124U (en) * 2019-09-28 2020-05-26 合肥金尼克机械制造有限公司 Low-temperature vacuum drying cabinet
CN112760172A (en) * 2021-02-05 2021-05-07 贵阳新奇微波工业有限责任公司 Device and method for collecting flower aromatic water through low-temperature microwave heating and condensation

Similar Documents

Publication Publication Date Title
CN208312897U (en) A kind of hot air vacuum combined drying equipment
CN206039342U (en) Intelligence storage cabinet
CN111238182B (en) Preliminary processing integration dehydration drying equipment of agricultural product
CN2715071Y (en) A moisture preservation refrigerator
KR101154329B1 (en) Apparatus and method for manufacturing of semi-dried persimmon
CN219995698U (en) Negative pressure internal circulation fruit and vegetable drying device control system
KR101934271B1 (en) Dry circulation system of an organic solids
CN207035701U (en) A kind of vacuum freeze drier
CN200966298Y (en) Combined drying machine for food at low temperature
CN100424452C (en) Heat pump and hot blast combined drying apparatus
CN112674366B (en) Fruit and vegetable infrared pressure difference puffing and drying equipment and process
CN106288666A (en) Carbon dioxide trap microwave vacuum drying device and drying means
CN116481266A (en) Negative pressure low temperature internal circulation fruit and vegetable drying system
CN106376302A (en) Fruit and vegetable subatmospheric pressure storage apparatus
CN1043286A (en) Desicator
CN104286755A (en) Method for preparing dewatered ginger slices
CN113915963A (en) Microwave vacuum freeze-drying equipment and microwave vacuum freeze-drying method thereof
CN212650339U (en) Low-temperature thawing machine
CN2224384Y (en) Low-temp. vacuum drier
CN201028909Y (en) Air refrigerator
CN106858271A (en) Heat pump type low-temperature high-humidity air unfreezing device
CN219894487U (en) Negative pressure internal circulation fruit and vegetable drying array device
CN221279824U (en) Negative pressure drying device for improving temperature uniformity
CN206760623U (en) Small-size low temperature and high humidity variable temperature air thawing apparatus
CN221279809U (en) Negative pressure drying and pure dew collection device of fractional condensation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination