Drying device

Abstract

The utility model discloses a drying device, which relates to the technical field of material drying, and comprises a drying box body, a drying chamber is arranged in the drying box body, and a placing part and a far infrared heating device corresponding to the placing part are arranged in the drying chamber; an air collecting chamber and an air inlet chamber which are communicated through a circulating fan are arranged in front of the drying chamber, the air collecting chamber is provided with a fresh air opening communicated with the outside, and the air inlet chamber is communicated with the drying chamber through an air inlet; an exhaust chamber is arranged behind the drying chamber, the drying chamber is communicated with the exhaust chamber through an air outlet, and the exhaust chamber is communicated with the outside through a dehumidification fan; an air return chamber communicated with the air collecting chamber and the air exhaust chamber is further arranged in the drying box body, and the air volume of the circulating fan is larger than that of the moisture exhaust fan. According to the utility model, far infrared rays are utilized to heat materials to be dried from inside to outside, so that the color and rehydration of the materials are better, and the loss of nutritional ingredients is small; recycling of heat energy and combination of hot air drying and far infrared drying are achieved through partial airflow circulation, and the heat energy utilization rate and the drying efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material drying, in particular to a drying device. Background Art

[0002] As is known to all, agricultural and sideline products (e.g., food, vegetables, Chinese medicinal materials, edible fungi, and some fruits) must be dried in time for convenient storage. However, the existing drying devices mostly use hot air drying. In traditional hot air drying, heat is transferred from the outside to the inside, the surface of agricultural and sideline products shrinks greatly, and it is easy to form a crust, which hinders the discharge of internal moisture. The drying rate is low, the drying inside and outside are uneven, and the volume of materials (especially preserved fruits, edible fungi, dried fruits, etc.) changes significantly, the rehydration type is poor, the loss of nutrients is large, and the taste is poor. It is not completely suitable for all materials, especially for high-quality products such as precious medicinal materials and fruits that require high rehydration, color and nutrient preservation. It is difficult to meet their drying requirements using traditional hot air drying, and the heat energy generating device of hot air drying is too large and occupies a large area. In addition, the airflow of the existing hot air drying device is mostly one-way circulation, and the hot air with moisture and heat is directly discharged from the drying device, and the heat energy utilization efficiency is low, resulting in a waste of resources. Utility Model Content

[0003] The purpose of the utility model is to provide a drying device to solve the problems existing in the above-mentioned prior art, change the heating method from outside to inside to inside to outside, make the directions of moisture diffusion and heat diffusion inside the material the same, which is beneficial to the evaporation and diffusion of moisture in the material, accelerate the drying speed of the material, and recycle part of the hot air to improve the utilization rate of thermal energy and reduce resource waste.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] A drying device comprises a drying box body, wherein a drying chamber is arranged in the drying box body, wherein a layered placement portion and a far-infrared heating device corresponding to the placement portion are arranged in the drying box body; an air collection chamber and an air inlet chamber connected through a circulating fan are arranged in front of the drying chamber, the air collection chamber is provided with a fresh air outlet connected to the outside, and the air inlet chamber is connected to the drying chamber through the air inlet; an exhaust chamber is arranged at the rear of the drying chamber, the drying chamber is connected to the exhaust chamber through an air outlet, and the exhaust air is connected to the outside through a dehumidification fan; a return air chamber connected to the air collection chamber and the exhaust chamber is also arranged in the drying box body, and the air volume of the circulating fan is greater than the air volume of the dehumidification fan.

[0006] Preferably, the air collection chamber is located above the air inlet chamber, the dehumidification fan is arranged on the top of the exhaust chamber, and the return air chamber is arranged on the top of the drying box.

[0007] Preferably, the fresh air inlets, circulating fans and dehumidification fans are evenly arranged in multiple numbers along the left and right directions of the drying chamber and correspond to each other one by one.

[0008] Preferably, a plurality of the far-infrared heating devices are evenly arranged along the left and right directions of the drying chamber and are staggered with the fresh air inlet, the circulating fan and the dehumidification fan.

[0009] Preferably, the placement portion is a conveyor belt extending in the left-right direction, and the conveyor belt is arranged in multiple layers from top to bottom, the conveying directions of adjacent conveyor belts are opposite, the discharge end of the upper conveyor belt corresponds to the feed end of the lower conveyor belt, and the discharge end of the lowest conveyor belt extends outside the drying box.

[0010] Preferably, each layer of the conveyor belt is provided with a driving shaft and a driven shaft respectively located at two ends and a driving mechanism for driving the driving shaft to rotate, and the driving shaft and the driven shaft are rotatably arranged on the side wall of the drying chamber.

[0011] Preferably, it also includes a feeding mechanism, and a feeding channel is provided on the top of the drying chamber, which passes through the wind collecting chamber and leads to the outside of the drying box body. The feeding port of the feeding channel is located below the discharging end of the feeding mechanism, and the discharging port is located above the feeding end of the conveyor belt of the first layer.

[0012] Preferably, each layer of the conveyor belt is provided with a corresponding far-infrared heating device, and the coverage of the far-infrared heating device on each layer of the conveyor belt is the same or decreases step by step from top to bottom.

[0013] Preferably, a baffle plate is provided between the feed end of the conveyor belt and the side wall of the drying box.

[0014] Preferably, the upper end of the baffle plate is connected to the side wall of the drying box, and the lower end of the baffle plate is adjacent to the conveying portion of the conveyor belt.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] By using a far-infrared heating device and utilizing the strong penetrating power and heating properties of far-infrared rays, more heat can be directly generated inside the dried material, and the evaporation of water on the surface of the material takes away the heat, so that the internal temperature of the material is higher than the surface temperature, and the internal temperature will diffuse to the surface; at the same time, due to the evaporation of surface water, the internal moisture is higher than the surface, and the moisture will also diffuse to the surface. The diffusion of moisture inside the material and the diffusion of heat are in the same direction, which is conducive to the evaporation and diffusion of moisture in the material, thus greatly accelerating the drying speed of the material.

[0017] By setting a return air chamber connecting the air collection chamber and the exhaust chamber, and making the air volume of the circulating fan greater than the air volume of the dehumidification fan, the air pressure in the air collection chamber is lower than the air pressure in the exhaust chamber, and the air flow driven by the circulating fan flows into the drying chamber, absorbs the heat and moisture emitted by the materials to be dried in the drying chamber, and enters the exhaust chamber. A part of it is discharged from the drying box by the dehumidification fan, and the other part flows into the air collection chamber through the air collection chamber as circulating air with heat. The circulating air merges with the fresh air entering from the fresh air inlet in the air collection chamber, and then flows to the drying chamber under the action of the circulating fan, thus forming a cycle. The confluence of the circulating air and the fresh air in the air collection chamber makes the air flow driven by the circulating fan to the drying chamber have a higher initial heat than the fresh air, forming hot air drying for the materials to be dried, thereby realizing the recycling of heat energy and improving the utilization rate of heat energy. At the same time, through the combination of hot air drying and far-infrared drying, it not only avoids the large shrinkage of the surface of the material to be dried, easy to form a crust, hinder the discharge of internal moisture, low drying rate, uneven drying inside and outside caused by using only hot air drying, but also adds part of the recovered heat energy on the basis of the heat energy provided by the far-infrared heating device, so that the total heat is increased, while the unit heat required for material drying remains unchanged, thereby accelerating the drying speed and improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the drying device disclosed in the utility model;

[0020] Figure 2 for Figure 1 Side view of

[0021] Among them, 1. drying box; 2. far-infrared heating device; 3. placement part; 4. discharge end; 5. feed end; 6. baffle plate; 7. rotating shaft; 8. feeding mechanism; 9. fresh air inlet; 10. air collection chamber; 11. circulation fan; 12. air inlet chamber; 13. drying chamber; 14. materials to be dried; 15. exhaust chamber; 16. dehumidification fan; 17. return air chamber; 18. feed channel. DETAILED DESCRIPTION

[0022] 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. People familiar with this technology can easily understand other advantages and functions of the utility model from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0024] It should also be noted that in the embodiments of the present application, the same figure mark is used to represent the same component or the same part.

[0025] The purpose of the utility model is to provide a drying device to solve the problems existing in the prior art, change the heating method from outside to inside to inside to outside, make the directions of moisture diffusion and heat diffusion inside the material the same, which is beneficial to the evaporation and diffusion of moisture in the material, accelerate the drying speed of the material, and recycle part of the hot air, improve the thermal energy utilization rate and drying efficiency, and reduce resource waste.

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Please refer to Figure 1 and Figure 2 The present embodiment provides a drying device, including a drying box 1, a drying chamber 13 is arranged in the drying box 1, a layered placement portion 3 is arranged in the drying chamber 13 for placing materials to be dried 14, and a far-infrared heating device 2 is also provided. The far-infrared heating device 2 is arranged corresponding to each layer of the placement portion 3, and is used to heat and dry the materials to be dried 14 on the placement portion 3.

[0028] Infrared is an electromagnetic wave with a wavelength range between visible light and microwaves. It has the characteristics of thermal radiation effect, penetration and directionality. Far infrared is a section with a longer wavelength in infrared. It has a strong thermal effect and penetration ability. It can penetrate deep into the interior of an object and heat the object from the inside, thus achieving fast and uniform drying. In addition, far infrared also has a selective heating function. When the wavelength of the emitted far infrared is consistent with the absorption wavelength of the heated material, the heated material will absorb a large amount of far infrared, so it can be heated in a targeted manner according to the absorption characteristics of different objects. When far infrared irradiates the surface of the material, part of the energy is absorbed by the surface of the material and converted into heat energy, and the other part of the energy penetrates the surface of the material and enters the interior. After absorbing the far infrared energy, the water molecules inside the material will resonate and convert into heat energy, causing the internal temperature of the material to rise rapidly and the water to evaporate rapidly. At the same time, the selective heating of far infrared prevents the material from being damaged due to excessive surface temperature during the drying process.

[0029] Since far infrared rays have strong thermal effects and penetrating power, they can directly act on the inside of the material, reducing energy transfer losses. Moreover, the selective heating of far infrared rays enables targeted heating of materials during the drying process, avoiding unnecessary energy waste. In addition, compared with ordinary hot air drying, far infrared drying technology can reduce the exhaust gas and noise pollution generated during the drying process, meeting the development requirements of green environmental protection.

[0030] In front of the drying chamber 13 of the present embodiment, there are arranged an air collection chamber 10 and an air inlet chamber 12 which are connected through a circulating fan 11. The air collection chamber 10 is provided with a fresh air port 9 connected to the outside, and the air inlet chamber 12 is connected to the drying chamber 13 through the air inlet; an exhaust chamber 15 is arranged at the rear of the drying chamber 13, and the drying chamber 13 is connected to the exhaust chamber 15 through an air outlet, and the exhaust air is connected to the outside through a dehumidification fan 16; a return air chamber 17 which is connected to the air collection chamber 10 and the exhaust chamber 15 is also arranged in the drying box body 1, and the air volume of the circulating fan 11 is greater than the air volume of the dehumidification fan 16.

[0031] The air collection chamber 10 and the exhaust chamber 15 are connected through the return air chamber 17. Theoretically, the air pressure at each place in the passage should be the same. However, since the air volume of the circulating fan 11 is greater than the air volume of the dehumidification fan 16, the air pressure in the air collection chamber 10 is less than the air pressure in the exhaust chamber 15. The airflow driven by the circulating fan 11 flows into the drying chamber 13, absorbs the heat and moisture emitted by the material to be dried 14 in the drying chamber 13, and enters the exhaust chamber 15. A part of the airflow is discharged from the drying box 1 by the dehumidification fan 16, and the other part flows into the air collection chamber 10 through the return air chamber 17. This part of the airflow is circulating air with heat. The circulating air merges with the fresh air entering from the fresh air inlet 9 in the air collection chamber 10, and then flows to the drying chamber 13 under the action of the circulating fan 11, thus forming a cycle.

[0032] The confluence of the circulating air and the fresh air in the air converging chamber 10 makes the airflow driven by the circulating fan 11 to flow to the drying chamber 13 have a higher initial heat than the fresh air, forming hot air drying of the material to be dried 14, thereby realizing the recycling of heat energy and improving the utilization rate of heat energy. At the same time, through the combination of hot air drying and far-infrared drying, it not only avoids the large shrinkage of the surface of the material to be dried 14 caused by the simple use of hot air drying, which is easy to form crusts, hinder the discharge of internal moisture, low drying rate, and uneven drying inside and outside, but also adds part of the recovered heat energy on the basis of the heat energy provided by the far-infrared heating device 2, so that the total heat is increased, while the unit heat required for material drying remains unchanged, thereby accelerating the drying speed and improving the drying efficiency.

[0033] As a preferred solution of this embodiment, the air collecting chamber 10 is located above the air inlet chamber 12, the dehumidification fan 16 is arranged on the top of the exhaust chamber 15, and the return air chamber 17 is arranged on the top of the drying box body 1.

[0034] There are multiple fresh air inlets 9, circulating fans 11 and dehumidification fans 16 evenly arranged in one-to-one correspondence along the left and right directions of the drying chamber 13, and there are multiple far-infrared heating devices 2 evenly arranged in the left and right directions, but they are staggered with the fresh air inlets 9, circulating fans 11 and dehumidification fans 16.

[0035] As a preferred solution of this embodiment, the placement part 3 is a conveyor belt extending in the left-right direction, the conveying directions of adjacent conveyor belts are opposite, the discharge end 4 of the upper conveyor belt corresponds to the feed end 5 of the lower conveyor belt, and the discharge end 4 of the lowest conveyor belt extends outside the drying box 1. Each layer of the conveyor belt is provided with a rotating shaft 7 for driving the belt to rotate, and the rotating shaft 7 includes a driving shaft and a driven shaft respectively located at both ends of the conveyor belt, and also includes a driving mechanism for driving the driving shaft to rotate, and the driving shaft and the driven shaft are rotatably arranged on the side wall of the drying chamber 13.

[0036] This embodiment also includes a feeding mechanism 8, and a feeding channel 18 is provided on the top of the drying chamber 13, which passes through the air collecting chamber 10 and leads to the outside of the drying box 1. The feeding port of the feeding channel 18 is located below the discharging end 4 of the feeding mechanism 8, and the discharging port is located above the feeding end 5 of the first layer conveyor belt. The material 14 to be dried enters the feeding channel 18 through the feeding mechanism 8 and falls onto the first layer conveyor belt, and then moves in an S-shaped section in the drying chamber 13 with the running of the conveyor belt, and finally is discharged from the conveyor belt of the lowest layer.

[0037] Each layer of the conveyor belt is provided with a corresponding far-infrared heating device 2. In this embodiment, a far-infrared heating plate is preferably used. According to the process requirements of material drying, by adjusting the number or size or heating temperature of each layer of far-infrared heating plates, and installing independent temperature and humidity sensors on each layer, different temperatures and humidity are set according to the drying degree of each layer, so as to achieve layered temperature and humidity control. For example, the number and size of the far-infrared heating plates set on each layer are the same, so that the far-infrared heating plates have the same coverage range on the conveyor belt, but the set heating temperatures are different, usually gradually decreasing from top to bottom. Such a setting can ensure the uniformity of heating the materials to be dried 14 on each layer of the conveyor belt as much as possible; for example, the number of far-infrared heating plates set on each layer is the same, but the size decreases step by step, or the size is the same, and the number decreases step by step, so as to achieve the coverage range of the far-infrared heating plates on the conveyor belt from top to bottom. The heating temperature is the same, so that the demand for far-infrared heating plates can be minimized and costs can be saved. Of course, the adjustment method is not limited to the above two schemes.

[0038] As a preferred solution of this embodiment, a baffle plate 6 is further arranged between the feed end 5 of the conveyor belt and the side wall of the drying box 1, the upper end of the baffle plate 6 is connected to the side wall of the drying box 1, and the lower end of the baffle plate 6 is adjacent to the conveying part of the conveyor belt, which is used to prevent the material falling from the upper conveyor belt from falling into the area outside the lower conveyor belt.

[0039] This embodiment uses far infrared rays to heat the material 14 to be dried from the inside. The direction of water diffusion and heat diffusion inside the material is the same, which is conducive to the evaporation and diffusion of water and accelerates the drying speed of the material. Compared with traditional hot air drying, the material drying quality is better, the color and rehydration are better, and the loss of nutrient components in the material is small. Moreover, compared with traditional hot air drying, the heat source of this embodiment is built-in, the space occupied is small, the equipment integrity is strong, and the transportation is convenient.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0042] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0043] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0044] Adaptive changes made according to actual needs are all within the protection scope of this utility model.

[0045] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0046] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A drying device, characterized in that: It includes a drying box body, wherein a drying chamber is provided in the drying box body, wherein a layered placement portion and a far-infrared heating device corresponding to the placement portion are provided in the drying box body; an air collection chamber and an air inlet chamber connected through a circulating fan are provided in front of the drying chamber, the air collection chamber is provided with a fresh air outlet connected to the outside, and the air inlet chamber is connected to the drying chamber through the air inlet; an exhaust chamber is provided at the rear of the drying chamber, the drying chamber is connected to the exhaust chamber through an air outlet, and the exhaust air is connected to the outside through a dehumidification fan; a return air chamber connected to the air collection chamber and the exhaust chamber is also provided in the drying box body, and the air volume of the circulating fan is greater than the air volume of the dehumidification fan.

2. The drying device according to claim 1, characterized in that: The air collection chamber is located above the air inlet chamber, the dehumidification fan is arranged on the top of the exhaust chamber, and the return air chamber is arranged on the top of the drying box body.

3. The drying device according to claim 1, characterized in that: The fresh air inlet, the circulating fan and the dehumidifying fan are evenly arranged in a plurality and correspond to each other along the left and right directions of the drying chamber.

4. The drying device according to claim 3, characterized in that: The far-infrared heating devices are evenly arranged in a plurality along the left and right directions of the drying chamber and are staggered with the fresh air inlet, the circulating fan and the dehumidification fan.

5. The drying device according to any one of claims 1 to 4, characterized in that: The placement portion is a conveyor belt extending in the left-right direction, and the conveyor belt is arranged in multiple layers from top to bottom, the conveying directions of adjacent conveyor belts are opposite, the discharge end of the upper conveyor belt corresponds to the feed end of the lower conveyor belt, and the discharge end of the lowest conveyor belt extends outside the drying box.

6. The drying device according to claim 5, characterized in that: Each layer of the conveyor belt is provided with a driving shaft and a driven shaft respectively located at two ends and a driving mechanism for driving the driving shaft to rotate. The driving shaft and the driven shaft are rotatably arranged on the side wall of the drying chamber.

7. The drying device according to claim 6, characterized in that: It also includes a feeding mechanism, and a feeding channel is arranged on the top of the drying chamber, which passes through the wind collecting chamber and leads to the outside of the drying box body. The feeding port of the feeding channel is located below the discharging end of the feeding mechanism, and the discharging port is located above the feeding end of the conveyor belt of the first layer.

8. The drying device according to claim 7, characterized in that: Each layer of the conveyor belt is provided with a corresponding far-infrared heating device, and the coverage of the far-infrared heating device on each layer of the conveyor belt is the same or decreases step by step from top to bottom.

9. The drying device according to claim 8, characterized in that: A material baffle is arranged between the feeding end of the conveyor belt and the side wall of the drying box.

10. The drying device according to claim 9, characterized in that: The upper end of the baffle plate is connected to the side wall of the drying box body, and the lower end of the baffle plate is adjacent to the conveying part of the conveyor belt.

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