Litchi longan drying room

Abstract

The utility model provides a kind of lychee longan drying room, its house body inside front and rear central position is equipped with a partition wall, and heating device installation gap and passage gap are left between the left and right ends of partition wall and house body inner wall;Embedded heater is installed in heating device installation gap, and front side wall is exposed from the outside of house body front side wall;The position of the front and rear side walls of house body and partition wall is respectively equipped with two longitudinal fan walls of front and rear in the vicinity of heating device, and house body is separated into heating chamber and drying chamber by fan wall.The hot air in the drying room can realize the clockwise flow and counterclockwise flow of the timing alternation circulation, so that the fruits in the drying chamber are heated more evenly, thereby improving the drying uniformity and the consistency of dried fruit quality.The heater of the drying room is equipped with a temperature controller to control the start and stop of the centrifugal fan according to the detection temperature of the drying chamber, which can automatically maintain the temperature of the drying chamber in a stable setting range, and the phenomenon of burnt fruit is not easy to occur.

Description

Technical Field

[0001] This utility model relates to a fresh fruit drying equipment, specifically a lychee and longan drying room, belonging to the technical field of food processing equipment. Background Technology

[0002] Fresh lychees and longans have a short shelf life. Making them into dried fruit, either whole or from the pulp, significantly reduces moisture content and increases sugar concentration, greatly inhibiting microbial growth and preventing rapid spoilage. This transforms summer fruits into year-round ingredients, serving directly as snacks or nutritional supplements. Dried lychees can alleviate the "heatiness" of fresh lychees, making them more suitable for long-term consumption or for soaking in water and making soup. Dried longans are neutral in nature and sweet in taste, possessing the effects of invigorating qi and blood, calming the mind, and stabilizing the spirit, making them more suitable for medicinal cuisine than fresh longans.

[0003] Currently, lychee and longan drying is mostly done in small workshops. These traditional drying rooms typically use wood as fuel to save on heat costs. To avoid the dried fruit developing a smoky flavor, traditional drying rooms generally employ isolated hot air drying. This involves a furnace located in the lower center of the drying room, with the flue running horizontally back and forth once at the bottom before expelling upwards. Above this flue is a downward-blowing fan that blows heat from the flue's outer wall downwards, creating hot air that enters the drying chambers on either side of the drying room. This hot air dries the fruit placed in these chambers. Therefore, the hot air in the drying chambers of traditional drying rooms always circulates unidirectionally from bottom to top. This results in uneven heating of the fruit placed on the drying racks, leading to poor drying uniformity and affecting the consistency of the dried fruit's quality. Furthermore, traditional drying rooms have poor control over the combustion of wood fuel, requiring manual adjustment of the heat. This lack of intelligent and precise temperature control within the drying chambers makes it easy to scorch the fruit, affecting the quality of the dried fruit. Utility Model Content

[0004] The purpose of this invention is to provide a lychee and longan drying room with more reasonable hot air circulation and more intelligent and accurate temperature control of the drying chamber, so as to solve the above-mentioned problems existing in traditional lychee and longan drying rooms.

[0005] The specific technical solution adopted in this utility model is as follows: A lychee and longan drying room comprises a rectangular body arranged horizontally. A partition wall is positioned centrally at the front and back of the room. Gaps are left between the partition wall and the inner wall of the room on both sides; one gap serves as a heater installation gap, and the other as a passageway for hot air and drying racks. An embedded heater is installed within the heater installation gap, its front side protruding outwards from a corresponding opening on the front wall of the room, and its rear side abutting against the inner wall of the rear wall of the room. One side of the heater rests against the end face of the partition wall, while the other side leaves a hot air flow gap with the inner wall of the room. Two longitudinal fan walls are respectively located between the front and back walls of the room and the partition wall near the heater, dividing the room into a heating chamber containing the heater and a drying chamber on the other side. Multiple sets of movable drying racks for holding the fruit are placed in the drying chamber. A goods inlet / outlet is located on the front wall of the room corresponding to the drying chamber, and a main door is provided to close the inlet / outlet.

[0006] The heater has a raised, supported furnace at its lower front end, with a furnace opening at the front end and a furnace door. A longitudinally extending main flue connects to the rear end of the furnace, and a vertically arranged rectangular rear flue connects to the rear end of the main flue. A rectangular front flue, corresponding to the rear flue, is fixedly mounted at the upper end of the furnace. The top surface of either the front or rear flue has a vertically extending exhaust outlet. Multiple layers of horizontally and longitudinally spaced sub-flues connect the front and rear flues from bottom to top. Each sub-flue layer has multiple parallel, spaced sub-flues. Horizontal baffles are installed between the ports of two sub-flue layers in both the front and rear flues. The horizontal baffle creates a serpentine flue channel that connects the sub-flue with the front and rear flues, eventually connecting to the exhaust outlet. The exhaust outlet passes through the roof of the chamber and connects to the inlet of the centrifugal fan on the outside of the roof. The outlet of the centrifugal fan is connected to an external exhaust duct on the outside of the roof for external discharge. The heater is also equipped with a temperature controller on the outside of the chamber. The temperature probe of the temperature controller is inserted into the chamber to detect the temperature of the drying chamber. The temperature control switch of the temperature controller is connected to the power supply line of the centrifugal fan. The temperature controller controls the start and stop of the centrifugal fan according to the detected temperature of the drying chamber.

[0007] The fan wall is equipped with a fan support, on which a set of reversible axial flow fans arranged in a rectangular array are fixedly installed. An air baffle is laid on the side of the fan support facing the drying chamber, and the air baffle has ventilation grid holes at the position corresponding to each axial flow fan. A fan control box is located on the outside of the chamber. The fan control box has circuitry that connects to and supplies power to each axial flow fan on the front and rear fan walls. During operation, the axial flow fans on the same fan wall rotate in the same direction, while the axial flow fans on the front and rear fan walls rotate in opposite directions. The fan control box controls all axial flow fans to automatically switch directions once every set time interval.

[0008] This lychee and longan drying room features axial flow fans on the same fan wall rotating in the same direction, while the axial flow fans on the front and rear fan walls rotate in opposite directions. A fan control box automatically switches the direction of all axial flow fans at set intervals. Therefore, the hot air inside the room can achieve a timed alternating clockwise and counterclockwise circulation, evenly circulating through the partition walls. This ensures more uniform heating of the fruit throughout the drying chamber, improving drying uniformity and consistency of dried fruit quality. The heater in this lychee and longan drying room is equipped with a centrifugal fan at the exhaust outlet, and a temperature controller adjusts the fan's operation based on the detected temperature in the drying chamber. Therefore, as long as there is sufficient wood fuel in the furnace, the combustion temperature in the furnace can be adjusted by controlling the centrifugal fan, automatically maintaining the temperature of the drying chamber within a stable set range, preventing the fruit from burning. Thus, compared to traditional lychee and longan drying rooms, this drying room has a more rational hot air circulation and more intelligent and accurate temperature control of the drying chamber. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the lychee and longan drying room.

[0010] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure after the roof slab of the building has been removed.

[0011] Figure 3 for Figure 2 A three-dimensional structural diagram after removing the movable drying rack inside the drying chamber.

[0012] Figure 4 for Figure 3 Top view.

[0013] Figure 5 This is a schematic diagram of the three-dimensional structure of the heater.

[0014] Figure 6 for Figure 5 A three-dimensional structural diagram of the heater when it is rotated to the right side facing forward.

[0015] Figure 7 for Figure 6 Exploded view of the heater components.

[0016] Figure 8 for Figure 6 A three-dimensional structural diagram of the heater after removing the centrifugal fan and external exhaust duct.

[0017] Figure 9 for Figure 8 A three-dimensional sectional view of the heater after horizontal and vertical cutting.

[0018] Figure 10 This is a three-dimensional structural diagram of the wind turbine wall.

[0019] Figure 11 for Figure 10 A three-dimensional structural diagram of the fan wall when it is rotated to the left side facing forward.

[0020] Figure 12 This is a three-dimensional structural diagram of a movable drying rack.

[0021] In the diagram: 1-Building, 1.1-Goods import / export, 1.2-Exhaust grid hole, 2-Separation wall, 3-Heater, 4-Fan wall, 5-Drying rack, 6-Main door, 7-Maintenance door, 8-Furnace, 8.1-Furnace opening, 9-Main flue, 10-Rear flue, 11-Front flue, 11.1-Insulation door, 12-Exhaust outlet, 13-Sub-flue, 14-Horizontal partition, 15-Centrifugal fan, 16-External exhaust pipe, 17-Temperature controller, 17.1-Temperature probe, 18-Vertical partition, 19-Fan bracket, 20-Axial flow fan, 21-Air baffle, 22-Ventilation grid hole, 23-Fan control box, 24-Movable bracket, 25-Perforated sieve. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments and accompanying drawings. In the description of the present invention, the directional terms "upper," "lower," "front," "rear," "left," and "right" are based on the accompanying drawings. Figures 1-3 , Figure 5 , Figure 10 , Figure 12 The orientations or positional relationships shown are defined only for the convenience of describing this utility model, and do not refer to a specific orientation that the device or component must have, and should not be regarded as a limitation of this utility model.

[0023] like Figures 1-12As shown, this lychee and longan drying room has a rectangular box 1 arranged horizontally. A partition wall 2 is located in the center of the front and back of the box 1. There are gaps between the partition wall 2 and the inner wall of the box 1 at both ends. One gap is used as a gap for installing heaters, and the other gap is used as a passage for hot air and drying racks 5. An embedded heater 3 is installed in the heater installation gap. Its front side protrudes outward from the corresponding opening on the front side wall of the box 1, and its rear side abuts against the inner wall of the rear side wall of the box 1. One side of the left and right sides of the heater 3 is close to the inner wall of the box 1. On the end face of the partition wall 2, a gap for hot air flow is left between the other side and the inner wall of the chamber 1; the front and rear side walls of the chamber 1 and the partition wall 2 are respectively provided with two longitudinal fan walls 4 near the heater 3, which divide the chamber 1 into a heating chamber containing the heater 3 on one side and a drying chamber on the other side. Multiple sets of movable drying racks 5 for holding fruits are placed in the drying chamber; the front side wall of the chamber 1 is provided with a goods inlet / outlet 1.1 at the position corresponding to the drying chamber, and the outside of the goods inlet / outlet 1.1 is provided with a main door 6 for sealing.

[0024] Furthermore, the top plate of the chamber 1 is provided with a set of exhaust grille holes 1.2 above the corresponding drying chamber for the drying moisture to escape; the main door 6 is a horizontally upright sliding door with a horizontal sliding rail.

[0025] Furthermore, the front side wall of the chamber 1 and the partition wall 2 are respectively provided with inspection doors 7 that can be opened forward at the positions between the heater 3 and the fan wall 4, so as to facilitate maintenance personnel to enter the heating chamber to inspect and maintain the equipment when the machine is stopped.

[0026] The heater 3 has a raised furnace 8 at its lower front end, with a furnace opening 8.1 with a furnace door at the front end of the furnace 8. The rear end of the furnace 8 is connected to a longitudinally extending main flue 9, and the rear end of the main flue 9 is connected to a vertically arranged rectangular rear flue 10. The upper end of the furnace 8 is fixedly supported by a rectangular front flue 11 corresponding to the rear flue 10. The top surface of the front flue 11 or the rear flue 10 has a vertically extending exhaust outlet 12. The front flue 11 and the rear flue 10 are connected from bottom to top by multiple layers of horizontally and longitudinally spaced sub-flues. Each sub-flue layer has multiple parallel and spaced sub-flues 13. Horizontal baffles 14 are provided in the front flue 11 and the rear flue 10 between the ports of two layers of sub-flues 13, respectively. The partition 14 obstructs the connection between the sub-flue 13 and the front and rear flues 11 and 10, forming a serpentine flue gas channel from bottom to top, which eventually connects to the exhaust outlet 12. The exhaust outlet 12 passes through the top plate of the chamber 1 and connects to the air inlet of the centrifugal fan 15 on the outside of the top plate of the chamber 1. The air outlet of the centrifugal fan 15 is connected to an external exhaust pipe 16 for external discharge on the outside of the top plate of the chamber 1. The heater 3 is also equipped with a temperature controller 17 on the outside of the chamber 1. The temperature probe 17.1 of the temperature controller 17 is inserted into the chamber 1 to detect the temperature of the drying chamber. The temperature control switch of the temperature controller 17 is connected to the power supply line of the centrifugal fan 15. The temperature controller 17 controls the start and stop of the centrifugal fan 15 according to the detected temperature of the drying chamber.

[0027] Furthermore, the heater 3 is positioned at the center of the front and rear sides of the main flue 9 and the sub-flue 13, with a vertical partition 18 that touches the ground at its lower end. This partition supports the middle of the main flue 9 and the middle of the sub-flue 13 from bottom to top. At the same time, the vertical partition 18 divides the periphery of the main flue 9 and the sub-flue 13 into two air heating zones, front and rear. The position of the vertical partition 18 corresponds to the position of the partition wall 2 inside the room 1.

[0028] Furthermore, the front side of the front flue 11 and the furnace opening 8.1 of the furnace 8 together serve as the front side of the heater 3, protruding outward from the corresponding opening on the front side wall of the chamber 1. The front side of the front flue 11 is also provided with an outwardly opening door 11.1 to facilitate ash removal and maintenance.

[0029] Furthermore, the horizontal partition 14 of the front flue 11 is a welded fixed partition, and the horizontal partition 14 of the rear flue 10 is an outwardly removable insert-type movable partition. The side wall of the rear flue 10 is provided with insertion holes at corresponding positions. The end of the movable partition is connected to a fixed plate. After the movable partition is inserted into the insertion hole, the fixed plate is fixedly connected to the side wall of the rear flue by screws, thereby sealing the insertion hole.

[0030] Furthermore, each sub-flue layer is provided with four parallel and spaced sub-flues 13. The sub-flues 13 adopt a rectangular cross-section to increase the surface area of ​​the outer side of the sub-flues 13 and improve the efficiency of external heat exchange.

[0031] Furthermore, the sub-flue layer comprises nine layers. The horizontal baffle 14 of the rear flue 10 is positioned between the ports of the third and fourth sub-flue layers 13 from bottom to top. The horizontal baffle of the front flue 11 is positioned between the ports of the sixth and seventh sub-flue layers 13 from bottom to top. The exhaust outlet 12 is located on the top surface of the front flue 11. In use, the hot flue gas from the combustion in the furnace 8 enters from the main flue 9 below the horizontal baffle 14 of the rear flue 10, then enters below the horizontal baffle 14 of the front flue 11 through the sub-flue layers 1-3, then enters above the horizontal baffle 14 of the rear flue 10 through the sub-flue layers 4-6, then enters above the horizontal baffle 14 of the front flue 11 through the sub-flue layers 7-9, and is discharged from the exhaust outlet 12 on the top surface of the front flue 11.

[0032] Furthermore, the temperature probe 17.1 of the temperature controller 17 is placed on one side of the passageway inside the chamber 1. This position is the midpoint of the hot air passage of the drying chamber and can represent the average temperature of the drying chamber.

[0033] The fan wall 4 is equipped with a fan bracket 19, on which a group of reversible axial flow fans 20 arranged in a rectangular array are fixedly installed. An air baffle 21 is laid on the side of the fan bracket 19 facing the drying chamber, and the air baffle 21 has ventilation grilles 21.1 at the position corresponding to each axial flow fan 20. A fan control box 23 is located outside the chamber 1. The fan control box 23 has circuitry connected to and supplies power to each axial flow fan 20 on the front and rear fan walls 4. During operation, the axial flow fans 20 on the same fan wall 4 rotate in the same direction, while the axial flow fans 20 on the front and rear fan walls 4 rotate in opposite directions. The fan control box 23 controls all axial flow fans 20 to automatically switch directions once every set interval. Furthermore, the axial flow fans 20 are GKT reversible axial flow fans that can withstand high temperatures and humidity.

[0034] Furthermore, the drying rack 5 is equipped with a movable support 24 with casters and multiple upper and lower storage frames. Each layer of the movable support 24 has a perforated winnowing basket 25 for holding the fruit.

[0035] When this lychee and longan drying room is in use, wood fuel is burned in the furnace 8 of the heater 3. The hot flue gas from the combustion transfers heat to the air in the heating chamber as it passes through the serpentine flue gas channel. The axial flow fans 20 on the front and rear fan walls 4 then drive the hot air in the heating chamber to form hot air that is blown into the drying chamber to dry the fruit on the drying racks 5. Since the axial flow fans 20 on the same fan wall 4 rotate in the same direction, while the axial flow fans 20 on the front and rear fan walls 4 rotate in opposite directions, and the fan control box 23 controls all the axial flow fans 20 to automatically switch directions once every set time interval, the hot air in the chamber 1 can achieve a timed alternating circulation of clockwise and counterclockwise flow, making the fruit in the drying chamber more evenly heated. This lychee and longan drying room uses a temperature controller 17 to automatically control the temperature of the drying chamber. As long as there is sufficient wood fuel in the furnace 8, the temperature controller 17 can control the start and stop of the centrifugal fan 15 according to the detected temperature of the drying chamber, thereby adjusting the combustion temperature of the furnace 8 and automatically maintaining the temperature of the drying chamber within a stable set range, making it less likely for the fruit to burn.

[0036] The above illustrations are merely typical embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lychee and longan drying room, characterized in that: The drying room is provided with a rectangular box body (1) arranged horizontally. A partition wall (2) is provided in the center of the front and back of the box body (1). There is a gap between the left and right ends of the partition wall (2) and the inner wall of the box body (1). One gap is used as a gap for installing heaters, and the other gap is used as a passage for heating air and drying rack (5). An embedded heater (3) is installed in the heater installation gap. Its front side protrudes outward from the corresponding opening on the front side wall of the box body (1), and its rear side abuts against the inner wall of the rear side wall of the box body (1). One side of the left and right sides of the heater (3) is close to the partition wall (2). On the end face, there is a gap for hot air flow between the other side and the inner wall of the chamber (1); the front and rear side walls of the chamber (1) and the partition wall (2) are respectively provided with two longitudinal fan walls (4) near the heater (3). The fan walls (4) divide the chamber (1) into a heating chamber containing the heater (3) and a drying chamber on the other side. Multiple sets of movable drying racks (5) for holding fruits are placed in the drying chamber; the front side wall of the chamber (1) is provided with a goods inlet and outlet (1.1) at the position corresponding to the drying chamber. The main door (6) is provided on the outside of the goods inlet and outlet (1.1) for sealing. The heater (3) has a furnace (8) supported by a raised frame at the lower front end. The furnace (8) has a furnace opening (8.1) with a furnace door at the front end. The furnace (8) is connected to a longitudinally extending main flue (9) at the rear end. The main flue (9) is connected to a vertically arranged rectangular rear flue (10) at the rear end. The furnace (8) is fixedly supported by a rectangular front flue (11) corresponding to the rear flue (10). The top surface of the front flue (11) or the rear flue (10) is provided with a vertically extending exhaust outlet (12). The front flue (11) and the rear flue (10) are connected from bottom to top by multiple layers of horizontally and longitudinally spaced sub-flues. Each sub-flue layer is provided with multiple parallel and spaced sub-flues (13). Horizontal baffles (14) are provided in the front flue (11) and the rear flue (10) between the ports of two layers of sub-flues (13), respectively. Water is used to pass through the sub-flues. The partition plate (14) blocks the connection between the sub-flue (13) and the front and rear flues (10) to form a serpentine flue gas channel from bottom to top and finally connects to the exhaust outlet (12); the exhaust outlet (12) passes through the top plate of the chamber (1) and connects to the air inlet of the centrifugal fan (15) on the outside of the top plate of the chamber (1). The air outlet of the centrifugal fan (15) is connected to an external exhaust pipe (16) for external discharge on the outside of the top plate of the chamber (1); the heater (3) is also equipped with a temperature controller (17) on the outside of the chamber (1). The temperature probe (17.1) of the temperature controller (17) is inserted into the chamber (1) to detect the temperature of the drying chamber. The temperature control switch of the temperature controller (17) is connected to the power supply line of the centrifugal fan (15). The temperature controller (17) controls the start and stop of the centrifugal fan (15) according to the detected temperature of the drying chamber. The fan wall (4) is provided with a fan bracket (19), and a set of reversible axial flow fans (20) arranged in a rectangular array are fixedly installed on the fan bracket (19). The fan bracket (19) is provided with a baffle plate (21) on the side facing the drying chamber. The baffle plate (21) has ventilation grid holes (22) at the position corresponding to each axial flow fan (20). A fan control box (23) is provided on the outside of the chamber (1). The fan control box (23) is provided with a circuit that is connected to and supplies power to each axial flow fan (20) on the front and rear fan walls (4). When working, the axial flow fans (20) on the same fan wall (4) rotate in the same direction and the axial flow fans (20) on the front and rear fan walls (4) rotate in opposite directions. The fan control box (23) controls all axial flow fans (20) to automatically switch directions once every set time interval.

2. The lychee and longan drying room according to claim 1, characterized in that: The top plate of the chamber (1) is provided with a set of exhaust grid holes (1.2) above the corresponding drying chamber for the drying water vapor to escape; the main door (6) is a horizontally upright sliding door with a horizontal sliding rail.

3. The lychee and longan drying room according to claim 1, characterized in that: The front side wall and partition wall (2) of the building body (1) are respectively provided with maintenance doors (7) that can be opened forward between the corresponding heater (3) and fan wall (4).

4. The lychee and longan drying room according to claim 1, characterized in that: The heater (3) is located in the center of the front and back, with a vertical partition (18) on the outside of the main flue (9) and the sub-flue (13) with its lower end touching the ground. It supports the middle of the main flue (9) and the middle of the sub-flue (13) from bottom to top. At the same time, the vertical partition (18) divides the outer perimeter of the main flue (9) and the sub-flue (13) into two air heating zones. The position of the vertical partition (18) corresponds to the position of the partition wall (2) inside the room (1).

5. The lychee and longan drying room according to claim 1, characterized in that: The front side of the front flue (11) and the furnace opening (8.1) of the furnace (8) together serve as the front side of the heater (3) and are exposed outward from the corresponding opening on the front side wall of the chamber (1). The front side of the front flue (11) is also provided with an insulated door (11.1) that can be opened outward.

6. The lychee and longan drying room according to claim 1, characterized in that: The horizontal partition (14) of the front flue (11) is a welded fixed partition, and the horizontal partition (14) of the rear flue (10) is a movable partition that can be pulled outward. The side wall of the rear flue (10) is provided with a hole at the corresponding position. The end of the movable partition is connected to a fixed plate. After the movable partition is inserted into the hole, the fixed plate is fixedly connected to the side wall of the rear flue (10) by screws, thereby sealing the hole.

7. The lychee and longan drying room according to claim 1, characterized in that: Each sub-flue layer is provided with 4 parallel and spaced sub-flues (13), and the sub-flues (13) adopt a flue with a rectangular cross section.

8. The lychee and longan drying room according to claim 1, characterized in that: The sub-flue layer has a total of 9 layers. The horizontal partition (14) of the rear flue (10) is located between the ports of the 3rd and 4th sub-flue (13) from bottom to top. The horizontal partition (14) of the front flue (11) is located between the ports of the 6th and 7th sub-flue (13) from bottom to top. The exhaust outlet (12) is located on the top surface of the front flue (11).

9. The lychee and longan drying room according to claim 1, characterized in that: The temperature probe (17.1) of the temperature controller (17) is placed on one side of the passageway inside the room (1).

10. The lychee and longan drying room according to claim 1, characterized in that: The drying rack (5) is equipped with a movable support (24) with casters and multiple upper and lower storage frames. Each layer of the movable support (24) has a hollowed-out winnowing basket (25) for holding the fruit.

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