Multi-layer circulating food dryer

Abstract

The invention relates to the field of food drying, in particular to a multi-layer circulating food drying machine which adopts a stage treatment technology combining condensation dehumidification and adsorption dehumidification and utilizes a preheating mechanism to recover condensation waste heat. The drying device structurally comprises a plurality of layers of independently sealed drying areas, each area is provided with a bottom air inlet groove, a top exhaust groove and a bottom exhaust groove, and a hot air path is optimized through a flow guide plate; the condensation mechanism adopts a spiral runway-shaped condensation pipe and a cooling fin to realize primary dehumidification, and the adsorption mechanism alternately works through a rotatable fan-shaped adsorption area to maintain the adsorption efficiency; the preheating mechanism absorbs condensation heat dissipation to preheat external air and then supplements the external air to the circulating system. Through hot air cyclic utilization, multi-stage dehumidification and waste heat recovery, the drying efficiency is remarkably improved, the energy consumption is reduced, meanwhile, the adaptability to food with different water contents is enhanced, and uniform and rapid drying is achieved.

Description

Technical Field

[0001] The present invention relates to the field of food drying, and particularly to a multi-layer cyclic food dryer. Background Art

[0002] In the field of food processing, the hot air drying technology is widely used due to its high efficiency and significant advantage of continuous production, and has become one of the key technologies to ensure food quality and production efficiency. Hot air drying directly contacts the material through hot air convection, greatly improving the heat and mass transfer efficiency. The hot air can quickly evaporate water and shorten the drying cycle.

[0003] However, there are still some technical defects in the actual application of traditional food dryers: 1. Most existing dryers adopt an open wet exhaust system, directly discharging high-temperature and high-humidity waste gas, resulting in a large amount of wasted heat energy. Research shows that the energy utilization rate of traditional hot air drying is only 20%-50%. 2. Some dryers use condensation dehumidification technology for recycling air, but the condensation dehumidification effect is poor, resulting in incomplete dehumidification, thus affecting the food drying efficiency. Moreover, a single dehumidification method is difficult to meet the drying requirements of foods with different moisture contents, affecting the drying uniformity. Summary of the Invention

[0004] To solve the foregoing technical problems, the present invention provides a multi-layer cyclic food dryer, which solves the problem of poor condensation dehumidification effect of traditional dryers by adopting a dehumidification method combining condensation dehumidification and adsorption dehumidification; and solves the problem of low energy utilization rate of traditional hot air drying by preheating external air during the condensation process to reduce the energy consumption of fresh air heating. Specifically, it is achieved through the following technical solutions.

[0005] The multi-layer cyclic food dryer of the present invention includes a drying box with a sealing door provided on its front side. Inside the drying box, a plurality of independent and sealed drying areas are distributed along the height direction; On one side of each drying area, an air inlet groove is provided, and on the other side, a first exhaust groove and a second exhaust groove are provided. The air inlet groove and the first exhaust groove are communicated with the bottom of the drying area, and the second exhaust groove is communicated with the top of the drying area; Inside each drying area, a guide rail and a slidable shelf are provided. The bottom of the shelf is provided with uniformly arranged flow guiding plates for changing the hot air flow direction; A condensation mechanism, which is communicated with a plurality of the second exhaust grooves, is used for condensing and dehumidifying the humid hot air; An adsorption mechanism, which is connected in series downstream of the condensation mechanism, is used for adsorbing and drying the dehumidified hot air. The adsorption mechanism includes a fan-shaped adsorption area rotatable inside an installation barrel, and the adsorption area is intermittently rotated to switch to maintain the adsorption efficiency; The condensation mechanism and the adsorption mechanism are connected in series to the air inlet groove through a pipeline, so that the processed hot air is circulated back into the drying box; The preheating mechanism is installed outside the condensation mechanism and absorbs the heat dissipated by condensation through external air. The preheated air is supplemented into the air inlet slot.

[0006] Preferably, the condensation mechanism includes a condensation tube in a spiral runway shape, heat dissipation fins are arranged on the outer surface of the condensation tube, and a collection tube and a drain pipe are connected to the bottom of the condensation tube.

[0007] Preferably, a rotating barrel is arranged in the installation barrel of the adsorption mechanism. The space between the rotating barrel and the inner barrel is separated into a plurality of fan-shaped areas by a partition plate. Each area is filled with an adsorbent and is driven by a stepping motor to rotate intermittently.

[0008] Preferably, a first through hole and a second through hole are respectively arranged on the side wall of the rotating barrel and the side wall of the inner barrel. The hot air sequentially enters the inner barrel through the first through hole, the adsorbent layer, and the second through hole.

[0009] Preferably, a helically distributed heating pipe and a return pipe are arranged inside the inner barrel, and a notch is formed on the side wall of the return pipe.

[0010] Preferably, the preheating mechanism includes a box body, an air inlet pipe, and an air outlet pipe. The box body is installed outside the condensation tube and the heat dissipation fins. External air is absorbed by the box body to absorb the condensation heat and is then transported to the inner barrel by a third air pump.

[0011] Preferably, the air outlet pipe is connected to a diversion bin, and the diversion bin is communicated with the inner barrel through a third through hole at the top of the inner barrel.

[0012] Preferably, the first exhaust slot is circularly communicated with the air inlet slot of the same group through a first air pump to form a bottom hot air convection.

[0013] Preferably, sealing baffles are respectively installed at both ends of the installation barrel to seal the ends of the fan-shaped areas in the working state, and the ends of the fan-shaped areas in the non-working state are communicated with the outside.

[0014] After adopting the above technical solutions, the beneficial effects of the present invention are as follows: 1. By setting the air inlet and outlet positions, the rapid flow of hot air in the drying box is realized. By increasing the wind speed, the drying speed of food is improved.

[0015] 2. Combining condensation dehumidification and adsorption dehumidification, the humid hot air is processed in stages, and the moisture in the hot air is deeply removed, thereby effectively improving the drying efficiency of food.

[0016] 3. Using the heat energy released during the condensation process to preheat the external air, the initial temperature of the fresh air is increased, and the heating energy consumption is reduced.

[0017] 4. By using the intermittent utilization of the adsorbent and combining with the evaporation of moisture in the adsorbent, the adsorption capacity of the adsorbent for moisture is always maintained, and the efficiency of hot air drying is improved. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 is a perspective view of a multi-layer cyclic food dryer; Figure 2 is a partial disassembled view of a multi-layer cyclic food dryer; Figure 3 is Figure 1 a front sectional view of; Figure 4 is a perspective view of the multi-layer cyclic food dryer from a second perspective; Figure 5 is Figure 4 a disassembled schematic diagram of some components in; Figure 6 is Figure 5 a partial sectional view of some components in; Figure 7 is a partial sectional view of the adsorption mechanism; Figure 8 is Figure 7 a partial enlarged view of part A in; Figure 9 is a top perspective view of some parts of the adsorption mechanism.

[0020] Explanation of the Reference Numerals: 101 - drying box, 102 - sealing door, 103 - air inlet groove, 104 - first exhaust groove, 105 - second exhaust groove, 106 - first air pump, 107 - first pipeline, 108 - second pipeline, 109 - second air pump, 110 - guide rail, 111 - shelf, 112 - deflector; 200 - condensation mechanism, 201 - condensation pipe, 202 - heat sink, 203 - collection pipe, 204 - drain pipe; 300 - preheating mechanism, 301 - box body, 302 - air inlet pipe, 303 - air outlet pipe, 304 - third air pump; 400 - Adsorption mechanism, 401 - Third pipeline, 402 - Connection channel, 403 - Installation barrel, 404 - Rotating barrel, 405 - Partition board, 406 - Sealing baffle, 407 - Stepper motor, 408 - First through hole, 409 - Second through hole, 410 - Return pipe, 411 - Notch, 412 - Heating pipe, 413 - Connecting pipe, 414 - Fourth pipeline, 415 - Inner cylinder, 416 - Shunt bin, 417 - Third through hole. Detailed implementation manners

[0021] The features of various aspects of the present invention and exemplary embodiments will be described in detail below. To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only provided to provide a better understanding of the present invention by showing examples of the present invention.

[0022] The orientation terms appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installation, connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] An embodiment of the present invention provides a multi - layer cyclic food dryer. Refer to Figure 1 、 Figure 2 , including a drying box 101. The drying box 101 is the main body for food drying. Inside it, there are multiple drying areas with the same structure and independent spaces evenly distributed along the height direction. A sealing door 102 is installed on the front side of the drying box 101 for sealing the drying box 101. After the sealing door 102 is closed, the drying areas inside the drying box 101 are sealed and separated to independently complete the drying work.

[0024] Refer to Figure 1 、 Figure 3 , on one side of the drying box 101, a number of air inlet slots 103 are fixedly installed. The number of air inlet slots 103 corresponds to each drying area inside the drying box 101 one by one, and is fixedly connected and communicated with the bottom of the side of the drying area, so that hot air can enter the multiple drying areas respectively through the number of air inlet slots 103.

[0025] On the other side of the drying oven 101, a number of first exhaust slots 104 and second exhaust slots 105 are fixedly installed. The first exhaust slots 104 and the second exhaust slots 105 are alternately distributed along the height direction of the drying oven 101. One drying area corresponds to a set of the first exhaust slots 104 and the second exhaust slots 105. The first exhaust slots 104 are fixedly communicated with the bottom of the drying area, and the second exhaust slots 105 are fixedly communicated with the top of the drying area.

[0026] See Figure 2 、 Figure 3 , on the side walls in each drying area, a number of guide rails 110 are fixedly installed. On the guide rails 110, a shelf 111 can be slidably installed. The shelf 111 is used to place the food to be dried. A number of flow guiding plates 112 are evenly arranged at the bottom of the shelf 111.

[0027] Among them, a number of the flow guiding plates 112 are evenly arranged along the direction from the air inlet slot 103 to the first exhaust slot 104, and the flow guiding plates 112 are arranged in a V shape, and the V-shaped angle is an obtuse angle. This structure is used to change the hot air flow direction from the air inlet slot 103 to the first exhaust slot 104, so that part of the hot air changes from the horizontal flow direction to the vertical flow direction, so that the hot air passes through the food to be dried placed on the shelf 111 and fully contacts the food surface, realizing the rapid drying of the food. After the hot air passes through the shelf 111, it gathers above the drying area and is discharged outwards through the second exhaust slot 105.

[0028] In the above structure, hot air is sent into a certain drying area of the drying oven 101 through the air inlet slot 103, and the hot air in the drying area is discharged outwards through the first exhaust slot 104 and the second exhaust slot 105, so that the drying oven 101 is divided into several drying groups that work independently.

[0029] Participate Figure 4 、 Figure 5 , a number of the first exhaust slots 104 are fixedly communicated with the air inlet slot 103 of the same group through a pipeline installed with a first air pump 106. A number of the second exhaust slots 105 are all fixedly communicated with a second pipeline 108 through a first pipeline 107. After the second pipeline 108 is successively connected in series with a condensation mechanism 200 and an adsorption mechanism 400 through a pipeline installed with a second air pump 109, they are respectively fixedly communicated with a number of the air inlet slots 103.

[0030] In this embodiment, the hot air enters from the bottom of the drying area through the air inlet slot 103 and is discharged outwards through the first exhaust slot 104 which is also located at the bottom of the drying area. And under the connection effect of the pipeline installed with the first air pump 106, the hot air forms convection and flows rapidly at the bottom of the drying area. The hot air in the circulating flow does not contact the food, so it always remains in a dry state.

[0031] Part of the circulating hot air, under the diversion of the deflector 112, passes through the shelf 111 in the drying area, dries the food, and then is discharged outward through the second exhaust slot 105. After this part of the hot air contacts the food and carries a large amount of moisture, it is discharged outward through the second exhaust slot 105, then converges into the second pipeline 108, and under the pumping action of the second air pump 109, it passes through the condensation mechanism 200 and the adsorption mechanism 400 in sequence. After condensation dehumidification and adsorption dehumidification, it is re-introduced into the air intake slot 103 to participate in the hot air circulation.

[0032] With the above design scheme, on the one hand, it can maintain a high flow rate of hot air in the drying area, facilitating the hot air to carry out the moisture in the food, thus efficiently realizing food drying; on the other hand, after the hot air carrying a large amount of moisture is subjected to condensation dehumidification and adsorption dehumidification, there is still some residual heat in this part of the hot air. Recycling this part of the hot air effectively reduces energy consumption and is environmentally friendly.

[0033] As a further explanation of the above embodiment, see Figure 6 The condensation mechanism 200 includes a condensation pipe 201 in a spiral runway shape. A number of radiating fins 202 are fixedly installed on the outer surface of the condensation pipe 201 to increase the contact area with the outside air and realize the rapid cooling of the hot air in the condensation pipe 201.

[0034] The bottom of the condensation pipe 201 is fixedly communicated with a number of collecting pipes 203, and the collecting pipes 203 are fixedly communicated with a drain pipe 204. As the temperature of the hot air in the condensation pipe 201 decreases, a large amount of moisture carried by the hot air will condense into water droplets on the inner wall of the condensation pipe 201. The water droplets flow downward through the collecting pipes 203 and converge in the drain pipe 204, and are discharged outward through the drain pipe 204. In this way, the first removal of moisture in the hot air is realized.

[0035] Of course, in order to prevent the hot air in the condensation pipe 201 from being discharged outward through the collecting pipes 203 and the drain pipe 204, those skilled in the art can adjust the height of the outlet position of the drain pipe 204, so that a part of clear water is stored in the drain pipe 204 to achieve a liquid seal effect and block the airflow.

[0036] As a further explanation of the above embodiment, see Figures 6 to 9 The adsorption mechanism 400 includes a third pipeline 401. The condensation pipe 201 is fixedly communicated with the third pipeline 401. The side of the third pipeline 401 is fixedly communicated with a connecting channel 402, and the connecting channel 402 is fixedly communicated with the side of an installation barrel 403. A rotating barrel 404 is rotatably installed inside the installation barrel 403. A number of partition plates 405 are fixedly installed on the inner surface of the rotating barrel 404 along its radial direction. The partition plates 405 are fixed to the inner cylinder 415, and the inner cylinder 415 is coaxially arranged with the rotating barrel 404.

[0037] A number of partitions 405 evenly divide the annular space between the rotating barrel 404 and the inner cylinder 415 into a number of fan-shaped areas, and each fan-shaped area is fixedly filled with an adsorbent for absorbing moisture in the airflow and achieving secondary drying of the airflow.

[0038] Sealing baffles 406 are fixedly installed at both ends of the mounting barrel 403, respectively. The sealing baffles 406 are used to seal and block the two ends of a single sector-shaped area. A stepper motor 407 is fixedly installed on the sealing baffle 406. The output end seal of the stepper motor 407 passes through the sealing baffle 406 and is coaxially fixed to the inner barrel 415, so that the stepper motor 407 can drive the inner barrel 415 and the rotating barrel 404 to rotate intermittently in the mounting barrel 403, thereby switching the position of the sector-shaped area, realizing the alternating use of different sector-shaped areas, which is beneficial to improving the dehydration efficiency of hot air.

[0039] In addition, since the sealing baffle 406 can only seal the fan-shaped area in the working process, the two ends of the remaining fan-shaped areas are open when not in use and connected to the outside world, which is conducive to evaporating the moisture in the adsorbent, thereby improving the water absorption efficiency in the next working process.

[0040] A plurality of first through holes 408 are provided on the side wall of the rotating barrel 404, and a plurality of second through holes 409 are provided on the side wall of the inner cylinder 415. Each sector-shaped area is provided with a group of first through holes 408 and second through holes 409. The first through holes 408 are located on one side of the sector-shaped area, and the second through holes 409 are located on the other side of the sector-shaped area. During normal operation, the plurality of first through holes 408 are aligned with the connecting channel 402.

[0041] Among them, the first through hole 408 and the second through hole 409 are respectively arranged on both sides of the fan-shaped area, so that the hot air flows from one side of the fan-shaped area to the other side. This process realizes sufficient contact between the hot air and the adsorbent, thereby improving the dehydration effect.

[0042] A spirally distributed heating tube 412 is coaxially fixedly installed inside the inner cylinder 415 for heating the hot air entering the inner cylinder 415. A return tube 410 is coaxially installed inside the heating tube 412. A slot 411 is provided on the side of the return tube 410. The slot 411 is provided on the side of the return tube 410 away from a group of second through holes 409 in adsorption work, so that after the hot air enters the inner cylinder 415 through the second through holes 409, it can enter the return tube 410 through the slot 411 after rotating half a circle along the inner cylinder 415. In this process, the contact time between the hot air and the heating tube 412 is increased, thereby effectively achieving the heating of the hot air.

[0043] The bottom of the return pipe 410 is communicated with the fourth pipeline 414 through the connecting pipe 413. The fourth pipeline 414 is fixedly communicated with a plurality of air inlet grooves 103 respectively. The hot air after adsorption dehumidification and heating is finally transmitted into each air inlet groove 103 to realize recycling.

[0044] In this embodiment, the hot air is sent into the interior of the installation barrel 403 through the third pipeline 401 and the connecting channel 402, and is conveyed to a certain fan-shaped area through the first through hole 408, contacts the adsorbent in the fan-shaped area, and realizes the removal of moisture. After the hot air completes the moisture removal, it enters the interior of the inner cylinder 415 through the second through hole 409, contacts the heating pipe 412 installed inside the inner cylinder 415 to realize temperature rise, then enters the interior of the return pipe 410 through the notch 411, and is finally conveyed to each air inlet groove 103 through the connecting pipe 413 and the fourth pipeline 414 to realize the recycling of the hot air.

[0045] In the above process, the residual heat in the hot air is fully utilized, so that the use requirements of the hot air can be met without consuming a large amount of energy.

[0046] As a further explanation of the above embodiment, see Figures 6 to 9 , a preheating mechanism 300 is installed outside the condensing mechanism 200 for preheating the external air and supplementing it into the air inlet groove 103. The preheating mechanism 300 includes a box body 301, and the box body 301 is fixedly installed outside the condensing pipe 201 and the heat sink 202 for surrounding the condensing pipe 201 and the heat sink 202 inside the box body 301.

[0047] One side of the bottom of the box body 301 is fixedly installed with an air inlet pipe 302, and the air inlet pipe 302 communicates the interior of the box body 301 with the outside. The other side of the top of the box body 301 is fixedly communicated with the first end of an air outlet pipe 303. A third air pump 304 is installed on the air outlet pipe 303. The second end of the air outlet pipe 303 is fixedly communicated with a flow distribution bin 416. The flow distribution bin 416 is hermetically and fixedly installed above the sealing baffle 406, and the flow distribution bin 416 is communicated with the interior of the inner cylinder 415 through a plurality of third through holes 417 coaxially opened at the top of the inner cylinder 415.

[0048] In this embodiment, the external air is sucked into the interior of the box body 301 through the air inlet pipe 302 under the action of the third air pump 304. On the one hand, the hot air in the condensing pipe 201 is cooled by the temperature difference between the external air and the hot air. On the other hand, the external air can absorb part of the heat to realize temperature rise.

[0049] After the external air enters the box body 301 and is initially heated, it is transported to the inner tube 415 through the air outlet pipe 303. After being fully heated by the heating tube 412 arranged inside the inner tube 415, it enters the return pipe 410 through the slot 411, and further passes through the connecting pipe 413 and the fourth pipe 414, and is finally transported to each air inlet slot 103 to complete the hot air replenishment.

[0050] After the hot air enters the inner cylinder 415, it contacts the heating tube 412 inside the inner cylinder 415 and heats up. When the demand for hot air replenishment in the drying box 101 is less than the hot air pumping volume of the third air pump 304, after the hot air enters the inner cylinder 415, the excess hot air will enter the corresponding fan-shaped area through the second through hole 409 on the fan-shaped area in the non-working state, thereby having a certain drying effect on the adsorbent installed in the fan-shaped area, and accelerating the drying effect of the adsorbent in the fan-shaped area in the non-working state.

[0051] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the only specific embodiments. Obviously, based on the above description, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The multi-layer cyclic food dryer is characterized in that: including a drying box (101) with a sealing door (102) provided on its front side, and a plurality of independent and sealed drying areas are distributed along the height direction inside the drying box (101); an air inlet groove (103) is provided on one side of each drying area, and a first exhaust groove (104) and a second exhaust groove (105) are provided on the other side. The air inlet groove (103), the first exhaust groove (104) are communicated with the bottom of the drying area, and the second exhaust groove (105) is communicated with the top of the drying area; a guide rail (110) and a slidable shelf (111) are provided in each drying area. A uniformly arranged flow guide plate (112) is provided at the bottom of the shelf (111) for changing the flow direction of hot air; a condensation mechanism (200) communicated with a plurality of the second exhaust grooves (105) for condensing and dehumidifying the humid hot air; an adsorption mechanism (400) connected in series downstream of the condensation mechanism (200) for adsorbing and drying the dehumidified hot air. The adsorption mechanism (400) includes a fan-shaped adsorption area rotatable inside an installation barrel (403), and the adsorption area is intermittently rotated to switch to maintain the adsorption efficiency; the condensation mechanism (200) and the adsorption mechanism (400) are connected in series to the air inlet groove (103) through pipes, so that the processed hot air circulates into the drying box (101); a preheating mechanism (300) is installed outside the condensation mechanism (200) to absorb the heat of condensation and heat dissipation through external air, and the preheated air is supplemented into the air inlet groove (103).

2. The multi-layer circulating food dryer according to claim 1, wherein: the condensation mechanism (200) includes a spiral runway-shaped condensation pipe (201), a heat dissipation fin (202) is provided on the outer surface of the condensation pipe (201), and a collecting pipe (203) and a drain pipe (204) are connected to the bottom of the condensation pipe (201).

3. The multi-layer circulating food dryer according to claim 1, wherein: a rotating barrel (404) is provided inside the installation barrel (403) of the adsorption mechanism (400). The space between the rotating barrel (404) and the inner barrel (415) is separated into a plurality of fan-shaped areas by a partition plate (405). Each area is filled with an adsorbent and is intermittently rotated by a stepping motor (407).

4. The multi-layer circulating food dryer according to claim 3, wherein: first through holes (408) and second through holes (409) are respectively provided on the side wall of the rotating barrel (404) and the side wall of the inner barrel (415), and the hot air sequentially passes through the first through holes (408), the adsorbent layer, and the second through holes (409) and enters the inner barrel (415).

5. The multi-layer circulating food dryer according to claim 4, wherein: a spiral-distributed heating pipe (412) and a return pipe (410) are provided inside the inner barrel (415), and a notch (411) is formed on the side wall of the return pipe (410).

6. The multi-layer circulating food dryer according to claim 1, wherein: The preheating mechanism (300) includes a box body (301), an air inlet pipe (302), and an air outlet pipe (303). The box body (301) is installed outside the condenser tube (201) and the heat sink (202). After the external air absorbs the condensation heat through the box body (301), it is conveyed to the inner cylinder (415) by a third air pump (304).

7. The multi-layer cyclic food dryer according to claim 6, characterized in that: The air outlet pipe (303) is connected to a flow splitting chamber (416), and the flow splitting chamber (416) is communicated with the inner cylinder (415) through a third through hole (417) at the top of the inner cylinder (415).

8. The multi-layer cyclic food dryer according to claim 1, characterized in that: The first exhaust groove (104) is cyclically communicated with the same group of air inlet grooves (103) through a first air pump (106) to form bottom hot air convection.

9. The multi-layer cyclic food dryer according to claim 3, characterized in that: Sealing baffles (406) are respectively installed at both ends of the installation barrel (403) to seal the ends of the fan-shaped area in the working state, and the ends of the fan-shaped area in the non-working state are communicated with the outside.

Images