A type of dried vegetable drying machine

Abstract

This utility model discloses a drying machine for dried vegetables, including a drying chamber and a housing shell fixedly connected to the drying chamber. A hot air supply is fixed to the side of the housing shell away from the drying chamber. Inside the housing shell, a first fan, a second fan, a third fan, and a fourth fan with progressively increasing power are arranged sequentially from top to bottom. The hot air supply is connected to the first fan, the second fan, the third fan, and the fourth fan via pipes. Air outlets are connected to the air outlets of the first fan, the second fan, the third fan, and the fourth fan. Four drying trays are placed inside the drying chamber. The advantages of this utility model are: by setting up an array of fans with progressively increasing power and controlling them independently, combined with rectangular trapezoidal air outlets located in the center of each tray, it can effectively solve the problem of uneven drying between upper and lower layers in multi-layer drying, especially enhancing the drying capacity for high-moisture materials in the lower layer.

Description

Technical Field

[0001] This utility model relates to the field of dried gongcai (a type of dried vegetable), and in particular to a dried gongcai drying machine. Background Technology

[0002] Fresh dried lily buds have a water content as high as 95%, making them highly susceptible to microbial growth at room temperature. During transportation, compression and heat accelerate spoilage. While traditional sun-drying can remove moisture, it relies on sunny weather; rainy days cause the lily buds to mold and turn black, resulting in up to 30% loss of raw materials. However, current lily bud drying machines often suffer from uneven internal drying, leading to lily buds that fail to meet consumer demands for quality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a drying machine for dried vegetables.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A vegetable drying machine includes a drying chamber and a housing shell fixedly connected to the drying chamber. A hot air supply unit is fixed to the side of the housing shell away from the drying chamber. Inside the housing shell, a first fan, a second fan, a third fan, and a fourth fan with progressively increasing power are arranged sequentially from top to bottom. The hot air supply unit is connected to the first fan, the second fan, the third fan, and the fourth fan via pipes. Air outlets are connected to the air outlets of the first fan, the second fan, the third fan, and the fourth fan. Four drying trays are placed inside the drying chamber. The four air outlets extend into the drying chamber and are located in the middle of the space below the drying trays. An airflow outlet is provided at the top of the drying chamber.

[0006] Furthermore, a controller is fixedly connected to the drying chamber; several temperature and humidity sensors are installed on the drying tray; the controller is electrically connected to the hot air supply unit, the first fan, the second fan, the third fan, the fourth fan, and the temperature and humidity sensors respectively.

[0007] Furthermore, the air outlet includes a first air duct and an air outlet section; the first air duct and the air outlet section are fixedly connected.

[0008] Furthermore, the end of the air outlet section away from the first air duct is tapered into a trapezoidal shape; the cross-section of the air outlet of the air outlet section is rectangular.

[0009] Furthermore, an air suction hood fixedly connected to the drying chamber is provided above the airflow outlet; the air suction hood is connected to an exhaust fan via a pipe.

[0010] Furthermore, the induced draft fan is electrically connected to the controller.

[0011] The beneficial effects of this utility model are:

[0012] (1) By setting up a fan array with progressively increasing power and controlling it independently, combined with the rectangular trapezoidal air outlet located in the middle of each mesh tray, the problem of uneven drying between upper and lower layers in multi-layer drying can be effectively solved, especially enhancing the drying capacity for high-humidity materials in the lower layer.

[0013] (2) Independent fan control combined with multi-point temperature and humidity sensor feedback enables precise perception of the drying status of each layer and dynamic air volume adjustment, which significantly improves drying efficiency and quality consistency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the air outlet structure;

[0016] Figure 3 A schematic diagram of the structure of this utility model after adding a suction hood and an exhaust fan.

[0017] In the picture,

[0018] 1-Drying chamber, 2-Equipment housing, 3-Hot air supply, 4-First fan, 5-Second fan, 6-Third fan, 7-Fourth fan, 8-Air outlet, 9-Controller, 10-Airflow outlet, 11-Drying tray, 12-Temperature and humidity sensor, 13-Suction hood, 14-Exhaust fan;

[0019] 801 - First air duct, 802 - Air outlet section. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] Reference Figure 1-3As shown, a dried vegetable drying machine includes a drying chamber 1 and a housing 2 fixedly connected to the drying chamber 1. A hot air supply unit 3 is fixed to the side of the housing 2 away from the drying chamber 1. Inside the housing 2, from top to bottom, are arranged a first fan 4, a second fan 5, a third fan 6, and a fourth fan 7 with progressively increasing power. The hot air supply unit 3 is connected to the first fan 4, the second fan 5, the third fan 6, and the fourth fan 7 via pipes. The air outlets of the first fan 4, the second fan 5, the third fan 6, and the fourth fan 7 are respectively connected to air outlets 8. Four drying trays 11 are placed inside the drying chamber 1. The four air outlets 8 extend into the drying chamber 1 and are located in the middle of the space below the drying trays 11. An airflow outlet 10 is provided above the drying chamber 1. This dryer is mainly used for the dehydration and drying of agricultural products such as dried vegetables. Its core function is to achieve efficient and uniform drying through graded and position-optimized hot air supply.

[0022] It should be noted that the drying chamber 1 constitutes the main chamber for the drying operation, and it is preferably welded from food-grade stainless steel plate, which has good heat insulation performance and corrosion resistance. A closable door (not shown, but a conventional design in the art) is provided on one side (e.g., the front side) of the drying chamber 1. The door preferably has a sealing strip and an observation window (not shown) to facilitate loading and unloading of the dried vegetables and observation of the internal condition. The equipment housing 2 is fixedly connected to one side (e.g., the rear side or bottom outer side) of the drying chamber 1 to house the main equipment other than the internal components of the drying chamber 1. The equipment housing 2 is also preferably made of metal plate, and its connection to the drying chamber 1 can be a secure connection such as welding or bolting. The hot air supply 3 is fixedly installed on the side of the equipment housing 2 away from the drying chamber 1 (i.e., the outer wall of the equipment housing 2). The hot air supply 3 contains heating elements (such as electric heating tubes, PTC heaters, etc.) and a primary fan to drive airflow. The air outlet of the hot air supply 3 is connected to the interior of the equipment housing 2 through a main air duct (not labeled). The main function of the hot air supply unit 3 is to generate a flow of hot air at the required temperature. Those skilled in the art can also select existing commercially available products according to actual needs; for example, an air-source heat exchanger can also be selected. Inside the equipment housing 2, a first fan 4, a second fan 5, a third fan 6, and a fourth fan 7, with progressively increasing power, are fixedly installed from top to bottom (along the direction of gravity). These fans are preferably centrifugal fans or high-pressure vortex fans, and are respectively fixed to the inner wall of the equipment housing 2 by mounting brackets with shock-absorbing pads. Specifically, the first fan 4 has the lowest power, for example, 50W; the second fan 5 has a higher power than the first fan 4, for example, 80W; the third fan 6 has a higher power than the second fan 5, for example, 120W; and the fourth fan 7 has the highest power, for example, 180W. This arrangement of progressively increasing power helps to create a more uniform air pressure distribution and hot air penetration within the drying chamber 1 from bottom to top. The main hot air flow generated by the hot air supply unit 3 is connected to the air inlets of the first fan 4, the second fan 5, the third fan 6, and the fourth fan 7 respectively through a distribution duct system (not detailed, but may include main pipes, branch pipes, and connecting flanges / hooks), ensuring that each fan receives a hot air supply. Air outlets 8 are used for the uniform outflow of hot air. The four air outlets 8 extend into the interior of the drying chamber 1 through the partition (with through holes and sealing rings, not shown) between the drying chamber 1 and the equipment housing 2. The rectangular outlet end of each air outlet 8 is located in the center of the space below the four drying trays 11 placed inside the drying chamber 1. Specifically, the drying trays 11 are preferably multi-layered (four layers are shown in the illustration, but the number can be adjusted as needed), each layer consisting of an independent tray frame and a stainless steel mesh (mesh size, for example, 2mm x 2mm or 3mm x 3mm) laid on it.Each rectangular air outlet 8 faces directly below the center area of ​​the corresponding drying tray 11, preferably between 10cm and 30cm from the bottom surface of the tray, such as 15cm or 20cm, to ensure that the hot air can effectively cover the layer of dried vegetables on the tray. The air outlet 10 is used to discharge the hot and humid air generated during the drying process.

[0023] Specifically, the controller 9 is electrically connected via cables to the hot air supply 3 (which controls its heating power and the start / stop of the primary fan), the first fan 4, the second fan 5, the third fan 6, and the fourth fan 7 (which control their respective start / stop and speed), the induced draft fan 14 (which controls its start / stop and speed), and all the temperature and humidity sensors 12 (which receive their detection signals). The controller 9 is preferably a PLC (Programmable Logic Controller) or a microcomputer control system with a display screen and operation buttons. On each drying tray 11 (preferably in the four corners or the center area of ​​the tray), several (e.g., at least 2-4) temperature and humidity sensors 12 are installed. These temperature and humidity sensors 12 are used to monitor the temperature and humidity parameters near the dried vegetables on the corresponding tray in real time.

[0024] Specifically, the air outlet 8 includes a first air duct 801 and an air outlet section 802; the first air duct 801 and the air outlet section. The end of the air outlet section 802 away from the first air duct 801 is a tapered trapezoidal shape; the air outlet cross-section of the air outlet section 802 is rectangular. One end of the first air duct 801 is fixedly connected to the air outlet of the corresponding fan (e.g., via a flange or clamp), and the other end is fixedly connected to the air outlet section 802 (e.g., by welding or integral molding). The end of the air outlet section 802 away from the first air duct 801 is designed to be an inwardly tapered trapezoidal shape (or a frustum-shaped, trumpet-shaped), and its air outlet cross-section is rectangular. Preferably, the tapering angle (cone angle) of this trapezoidal shape is between 15° and 30°, for example, 20°, so that the airflow is more concentrated and evenly directed toward the drying tray.

[0025] An exhaust hood 13, fixedly connected to the drying chamber 1, is provided above the air outlet 10; the exhaust hood 13 is connected to an induced draft fan 14 via a pipe. The induced draft fan 14 is electrically connected to the controller 9. To effectively collect and expel moisture, an exhaust hood 13 is provided above the air outlet 10. The exhaust hood 13 is preferably funnel-shaped, with its larger opening covering the area of ​​the air outlet 10 and fixedly connected to the top of the drying chamber 1 (e.g., bolted). The smaller opening of the exhaust hood 13 is connected to the air inlet of the induced draft fan 14 via an exhaust pipe (not shown). The function of the induced draft fan 14 is to create a negative pressure inside the drying chamber 1, forcibly drawing away the hot and humid exhaust gas, maintaining the continuous drying process and airflow circulation within the chamber.

[0026] The working principle of this utility model:

[0027] Workers evenly spread the chopped dried vegetables on the drying trays 11 and close the doors. Controller 9 starts the hot air supply unit 3 (initiating heating and air supply) and the induced draft fan 14. Hot air flows through the distribution ducts and into each fan. Based on a preset program or real-time temperature and humidity data, those skilled in the art can select and independently control the start / stop and speed of the first fan 4 to the fourth fan 7 as needed. In the initial drying stage, when the material has high moisture content, all four fans can be started simultaneously. Depending on the high moisture content of the lower layer, the speed of the fourth fan 7 (bottommost layer) can be appropriately increased to enhance the drying capacity for the high-moisture material at the bottom. As drying progresses, controller 9 dynamically adjusts the speed of each fan based on data from the temperature and humidity sensors 12 of each layer. If the humidity of a certain layer (e.g., the upper layer) decreases rapidly, the speed of the corresponding upper-layer fan (e.g., the first fan 4) can be reduced to avoid over-drying; if the humidity of a certain layer (e.g., the lower layer) remains high, the speed of the corresponding fan (fourth fan 7) can be maintained or increased. The progressively increasing fan power design ensures sufficient air pressure to effectively deliver hot air to the upper mesh tray, even when the lower fan speed is high. Hot air is blown upwards from the rectangular outlets 8 of each nozzle, evenly penetrating the corresponding vegetable layer and removing moisture. The stepped outlet design reduces airflow diffusion, allowing the hot air to act more concentratedly on the material. The humid waste gas is forced out from the airflow outlet 10 above the drying chamber 1 by the negative pressure generated by the induced draft fan 14, passing through the suction hood 13 and the exhaust duct. When the parameters detected by all temperature and humidity sensors 12 reach the set endpoint requirements, the controller 9 automatically shuts off the hot air supply 3 and all fans and induced draft fans 14, completing the drying process.

[0028] This application specifies four layers of drying trays corresponding to four fans. In alternative embodiments, the number of tray layers and fans can be increased or decreased according to the actual drying scale requirements, for example, three layers with three fans, or five layers with five fans. The increasing gradient of fan power can also be adjusted as needed, and is not limited to a specific power value. The contraction shape of the air outlet section 802 of the air outlet 8 is not limited to a trapezoidal shape, but can also be a gradually contracting arc transition (such as a trumpet shape). The aspect ratio of the rectangular air outlet can be optimized and adjusted according to the shape of the drying tray. In alternative solutions, the air outlet can also be designed with a structure with a flow equalization net or guide vanes to further improve airflow uniformity. The number and position of temperature and humidity sensors 12 can be adjusted as needed, for example, three (forming a triangular monitoring) or more can be arranged per tray. The drying tray 11 can adopt a drawer-type design for easy pushing in and pulling out of the drying chamber 1. The tray frame material can be stainless steel or aluminum alloy. Although this embodiment uses dried mustard greens as an example, this dryer is also applicable to the dehydration and drying of other strip-shaped, sheet-shaped, or small-piece agricultural products (such as bracken, dried plum vegetables, French fries, mushrooms, etc.) that require similar drying processes. This application can effectively shorten the drying time of dried mustard greens from the original 20 hours to 6 hours, resulting in high-quality dried mustard greens.

[0029] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A dried mustard root dryer, comprising a drying box body (1) and a device containing shell (2) fixedly connected with the drying box body (1), characterized in that: A hot air supply unit (3) is fixed on the side of the equipment housing (2) away from the drying chamber (1); inside the equipment housing (2), a first fan (4), a second fan (5), a third fan (6), and a fourth fan (7) with progressively increasing power are placed from top to bottom; the hot air supply unit (3) is connected to the first fan (4), the second fan (5), the third fan (6), and the fourth fan (7) through pipes; the air outlets of the first fan (4), the second fan (5), the third fan (6), and the fourth fan (7) are respectively connected to air nozzles (8); four drying trays (11) are placed inside the drying chamber (1); the four air nozzles (8) extend into the drying chamber (1) and are respectively located in the middle of the space below the drying trays (11); an airflow outlet (10) is provided above the drying chamber (1).

2. The preserved mustard drying machine according to claim 1, characterized in that: A controller (9) is fixedly connected to the drying chamber (1); several temperature and humidity sensors (12) are installed on the drying tray (11); the controller (9) is electrically connected to the hot air supply unit (3), the first fan (4), the second fan (5), the third fan (6), the fourth fan (7) and the temperature and humidity sensors (12).

3. The preserved mustard drying machine according to claim 1, characterized in that: The air outlet (8) includes a first air duct (801) and an air outlet section (802); the first air duct (801) and the air outlet section (802) are fixedly connected.

4. The preserved mustard drying machine according to claim 3, characterized in that: The air outlet section (802) is tapered into a trapezoidal shape at the end furthest from the first air duct (801); the air outlet section (802) has a rectangular cross-section.

5. The preserved mustard drying machine according to any one of claims 1-4, characterized in that: Above the air outlet (10) is a suction hood (13) that is fixedly connected to the drying chamber (1); the suction hood (13) is connected to an exhaust fan (14) through a pipe.

6. The preserved mustard drying machine according to claim 5, characterized in that: The induced draft fan (14) is electrically connected to the controller (9).

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