Kitchen waste dryer

Abstract

The kitchen waste drying machine comprises an upper shell and a lower shell which are detachable, the lower shell comprises an inner cavity, an inner barrel used for containing kitchen waste is arranged in the inner cavity, a through hole is formed in the bottom of the inner barrel, an air inlet and an air outlet are formed in the upper shell, a confluence cavity is formed in the upper shell, the confluence cavity is communicated with the air inlet, and an air outlet is formed in the lower shell. An air draft device is arranged in the confluence cavity, an outlet of the air draft device is connected with a heating device, the heating device communicates with the inner cylinder and the air outlet, and the bottom and the periphery of the inner cylinder are arranged at intervals with the inner cavity; a steam channel used for containing kitchen garbage waste water and conveying steam formed by heating kitchen garbage is formed in the interval between the inner cylinder and the inner cavity, and the steam channel is communicated with the confluence cavity. According to the scheme, heat loss is low, drying efficiency is high, cleaning is convenient, the recycling rate of kitchen garbage is high, and the drying effect is good.

Description

Technical Field

[0001] The invention relates to the field of kitchen waste treatment, and in particular to a kitchen waste drying machine. Background Art

[0002] In the commonly used methods of kitchen waste treatment, especially in the treatment of household kitchen waste, in order to reduce the volume of kitchen waste, prevent excessive reproduction of microorganisms, and reduce the generation of odor, it is usually necessary to dehydrate pure liquid food waste and kitchen waste with a high water content.

[0003] Common household food waste treatment methods include mechanical pressing or crushing to achieve dehydration or heating and drying: Among them, the method of dehydrating kitchen waste by mechanically squeezing or crushing is such as the invention patent with the authorization announcement number CN115213198B, which provides a squeezing and dehydrating kitchen waste treatment equipment. The squeezing and dehydrating method reduces the moisture content of the residue after treatment, is economical and practical, has low noise, and effectively solves the noise pollution caused by vacuum water absorption or centrifugal drying. However, the squeezing and dehydrating method usually cannot timely treat the wastewater generated during the squeezing process, and the grease and soluble pollutants in these wastewaters will cause environmental pollution if they are directly discharged; in addition, kitchen waste contains a large amount of organic matter and nutrients, and squeezing and dehydrating treatment easily wastes these resources, resulting in the ineffective use of organic matter.

[0004] In the prior art, methods of treating kitchen waste by heating and drying mainly include two methods: direct heating of the kitchen waste and hot air drying.

[0005] The method of directly heating kitchen waste is usually to set a heating device inside or outside the container for accommodating kitchen waste, so as to increase the temperature inside the container to achieve heating and dehydration of the kitchen waste in the container. For example, the utility model patent with the authorization announcement number CN221720725U provides a kitchen waste disposer, in which the bottom of the mixing barrel contacts the heating component to achieve heating of the kitchen waste in the mixing barrel, and the fan assembly is used to accelerate the air flow inside the kitchen waste disposer, so that the water vapor generated during the drying process flows quickly along the direction of the air duct and is discharged. Compared with the mechanical compression method, by heating the kitchen waste to evaporate its internal moisture, the organic matter and nutrients in the kitchen waste can be retained, and the recycling rate of the kitchen waste can be improved. However, there are still some problems in the actual application of this type of food waste disposer: 1. The drying process is uneven. The food waste in the mixing barrel near the heating component has a higher drying efficiency, while the part far from the heating component is prone to residual moisture, the drying effect is poor, and the drying efficiency is low; 2. When the heating time is too long, the food waste is easy to burn on the surface of the mixing barrel (container) near the heating component, which makes it more difficult to clean after use; at the same time, the excessive heating temperature and heating time in the local area are also likely to cause safety problems; Using hot air drying to treat kitchen waste can solve the various problems caused by direct heating mentioned above, such as a kitchen waste drying and dehydrating machine disclosed in the invention patent with publication number CN117989819A. The drying and dehydrating machine first introduces hot air into the garbage basket through the hot air device in the first area A, and then introduces the high-humidity hot air into the third area C through the pneumatic device located in the second area B, and then discharges it after filtration, which can reduce the baking time, improve the garbage dehydration rate, and improve the working efficiency of drying and dehydration. However, due to the independent partition design of the device, the hot air transmission and high-humidity hot air circulation distance are relatively long, resulting in partial heat loss; the hot air is blown into the garbage basket and the high-humidity hot air is blown out using different power sources, which also increases the manufacturing and use costs of the product. Summary of the invention

[0006] Therefore, in order to solve the above-mentioned problems and realize high-efficiency and low-loss drying of kitchen waste, the present invention provides a kitchen waste dryer.

[0007] The present invention is achieved through the following technical solutions: A kitchen waste dryer comprises a detachable upper shell and a lower shell, the lower shell comprises an inner cavity, an inner cylinder for accommodating kitchen waste is arranged in the inner cavity, a through hole is arranged at the bottom of the inner cylinder, an air inlet and an air outlet are arranged on the upper shell, a confluence cavity is arranged inside the upper shell, the confluence cavity is communicated with the air inlet, and an exhaust device is arranged inside the confluence cavity, a heating device is connected to the outlet of the exhaust device, the heating device is respectively communicated with the inner cylinder and the air outlet, the bottom and the outer periphery of the inner cylinder are spaced from the inner cavity, and a steam channel for accommodating kitchen waste wastewater and conveying water vapor formed by heating the kitchen waste is formed at the interval between the inner cylinder and the inner cavity, the steam channel is communicated with the confluence cavity, so that the water vapor enters the confluence cavity and merges with the external air entering through the air inlet, the merged air is synchronously sucked into the heating device for heating through the exhaust device, and the heated air is diverted to the inner cylinder and the air outlet.

[0008] Preferably, the top of the heating device is connected to the outlet of the exhaust device, and the bottom of the heating device is also provided with a first hot air outlet and a second hot air outlet, respectively, the first hot air outlet is connected to the inner cylinder, and the second hot air outlet is connected to the air outlet.

[0009] Preferably, the heating device includes a heating coil fixing frame and a heating coil arranged in the heating coil fixing frame, the first hot air outlet and the second hot air outlet are both arranged at the bottom of the heating coil fixing frame, and a plurality of guide plates are obliquely arranged in the first hot air outlet, and the inclination directions and inclination angles of the plurality of guide plates are the same.

[0010] Preferably, the exhaust device includes an exhaust fan and a fan fixing frame arranged at the bottom of the exhaust fan, the bottom of the fan fixing frame is fixed to the top of the heating coil fixing frame, and a heating exhaust chamber is formed together inside the fan fixing frame and the heating coil fixing frame.

[0011] Preferably, a lining plate is provided between the upper shell and the lower shell, and the lining plate is also provided with a steam outlet at the top of the steam channel. The steam outlet is arranged outside the heating exhaust chamber and connected to the confluence chamber, and the lining plate is also provided with an avoidance hole for avoiding the first hot air outlet.

[0012] Preferably, a temperature sensor is further provided in the heating device, and the temperature sensor is arranged between the exhaust fan and the heating coil.

[0013] Preferably, a filter device is further provided inside the upper shell, the inlet of the filter device is connected to the second hot air outlet, and the outlet of the filter device is connected to the air outlet.

[0014] Preferably, the filtering device comprises an activated carbon box, the bottom and the top of the activated carbon box are provided with air holes, the bottom of the activated carbon box is spaced apart from the lining plate, and the second hot air outlet is located between the activated carbon box and the lining plate.

[0015] Preferably, a control unit is further provided inside the upper shell, and the control unit includes at least a PCB controller and a power switch connected to the PCB controller, and the PCB controller is connected to the heating coil, the exhaust fan and the temperature controller through leads respectively.

[0016] Preferably, an LED light source is provided in the control unit, and the LED light source is fixed on the lining plate. An observation notch is provided at the top opening of the inner cylinder on the side close to the LED light source, and a window cover for observing the interior of the lower shell is also provided between the upper shell and the lower shell.

[0017] The beneficial effects of the technical solution of the present invention are mainly reflected in: 1. A confluence chamber is provided in the upper shell of the kitchen waste dryer, which is communicated with the air inlet and the steam channel respectively so that the water vapor formed after the kitchen waste is heated enters the confluence chamber and converges and mixes with the external air entering through the air inlet, thereby preheating it before the external space is heated. The converged air is synchronously sucked into the heating device through the exhaust device for heating. Most of the heated air circulates into the inner drum to further dry the kitchen waste, and the other part of the air flows to the air outlet for discharge, thereby realizing the heat circulation in the kitchen waste dryer. The entire heat circulation channel is short and has the functions of steam heat recovery, internal and external air circulation, and internal air heating, thereby minimizing heat loss and improving drying efficiency.

[0018] 2. An exhaust device and a heating device are simultaneously arranged in the confluence cavity, so that the same exhaust power source is used for sucking air, blowing hot air into the inner cylinder, and discharging high-humidity hot air after confluence heating, thereby reducing the manufacturing and use costs of the product.

[0019] 3. The confluence chamber is connected to the steam channel and the air inlet at the same time. At the same time, the negative pressure of the suction device increases the wind speed in the confluence chamber and the steam channel connected to the confluence chamber, which can accelerate the removal of heat on the surface of the wastewater at the bottom of the steam channel, making it easier for water molecules to break away from the liquid surface and enter the air, and the chance of water molecules returning to the liquid is reduced, thereby accelerating the evaporation rate and further improving the drying efficiency.

[0020] 4. A filter device for filtering exhaust gas can be set in the upper shell to filter harmful gases and deodorize the exhaust gas to avoid polluting the environment. Since the air is heated by the heating device before entering the filter device, the heated air expands, thereby increasing its pressure and volume. Combined with the exhaust device, the air flow speed is accelerated, making it easier for the air to pass through the filter device. Combined with this advantage, a filter device with higher filtering accuracy can be adapted to further enhance the filtering effect.

[0021] 5. A window cover for observing the interior of the lower shell is provided between the upper shell and the lower shell. Combined with the LED light source provided on the lining plate and the observation notch at the top opening of the inner drum, the user can observe the drying situation in the inner drum in real time.

[0022] 6. Using hot air to dry kitchen waste can, on the one hand, improve drying efficiency and ensure uniform drying of kitchen waste in all areas of the inner drum; on the other hand, it can avoid the problem of kitchen waste sticking to the inner drum due to too long heating time, ensuring safety of use and facilitating cleaning; in addition, hot air drying can ensure the recycling rate of kitchen waste after processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional picture of a food waste dryer; Figure 2 It is a side view of the food waste dryer; Figure 3 It is a cross-sectional view of the food waste dryer along line AA; Figure 4 This is a schematic diagram of the air flow path inside the food waste dryer; Figure 5 is a cross-sectional view of the upper shell of the food waste dryer and its internal structure along line AA; Figure 6 It is a cross-sectional view of the food waste dryer along line NN; Figure 7 It is a cross-sectional view of the food waste dryer along line II; Figure 8 This is a top view of the food waste dryer; Fig. 9 It is a cross-sectional view of the food waste dryer along line CC; Fig.10 This is an exploded view of a food waste dryer. DETAILED DESCRIPTION

[0024] In order to make the purpose, advantages and features of the present invention more clearly and in detail, the following preferred embodiments are used for illustration and explanation. The embodiments are only typical examples of the application of the technical solution of the present invention. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0025] At the same time, it is stated that in the description of the scheme, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplified description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" in this solution are only used for descriptive purposes and cannot be understood as indicating or implying the order of importance, or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] The present invention discloses a kitchen waste drying machine, such as Figure 1-Figure 3 as well as Figure 8 , Fig.10 As shown, it includes a detachable upper shell 1 and a lower shell 2, the lower shell 2 includes an inner cavity 201, an inner cylinder 3 for accommodating kitchen waste is arranged in the inner cavity 201, and a through hole 302 is arranged at the bottom of the inner cylinder 3, so as to ensure that the waste water in the kitchen waste in the inner cylinder 3 can flow into the inner cavity 201 through the through hole 302 at the bottom of the inner cylinder 3, and ensure air circulation between the inner cylinder 3 and the inner cavity 201.

[0028] like Figure 3 , Figure 4 As shown, the upper shell 1 is provided with an air inlet 4 and an air outlet 5 to ensure that the food waste dryer maintains circulation with the external air. A confluence cavity 6 is provided inside the upper shell 1, and the confluence cavity 6 is communicated with the air inlet 4. In a preferred embodiment, in order to facilitate the air confluence in the confluence cavity 6, the air inlet 4 is arranged at the top of the confluence cavity 6.

[0029] like Figure 3 , Figure 4 As shown, an exhaust device is provided inside the confluence chamber 6, and a heating device is connected to the outlet of the exhaust device. The heating device is respectively connected to the inner tube 3 and the air outlet 5. When the exhaust device is working, the air in the confluence chamber 6 is sucked into the heating device through the action of centrifugal force, and the air is heated by the heating device and flows to the inner tube 3 and the air outlet 5 respectively. At the same time, since the exhaust device continuously draws air from the confluence chamber 6, a negative pressure is generated inside the confluence chamber 6, so that the external air continues to enter the confluence chamber 6 through the air inlet 4.

[0030] like Figure 3 , Figure 4 , Fig. 9 As shown, the bottom and the outer periphery of the inner cylinder 3 are spaced apart from the inner cavity 201, and a steam channel 7 for accommodating kitchen waste wastewater and conveying water vapor generated by heating the kitchen waste is formed at the interval between the inner cylinder 3 and the inner cavity 201. Specifically, the kitchen waste water flows from the through hole 302 at the bottom of the inner cylinder 3 into the interval between the bottom of the inner cylinder 3 and the bottom of the inner cavity 201. At the same time, since the heating device continuously blows hot air into the inner cylinder 3, the hot air evaporates the moisture in the kitchen waste and passes through the through hole 302 at the bottom of the inner cylinder 3 into the steam channel 7 between the inner cylinder 3 and the inner cavity 201, and flows upward along the steam channel 7. When there is wastewater at the bottom of the steam channel 7, the water vapor generated by the evaporation of the wastewater also flows upward in the steam channel 7 synchronously.

[0031] like Figure 4 As shown, the steam channel 7 is communicated with the confluence chamber 6, so that the water vapor in the steam channel 7 enters the confluence chamber 6 and then converges with the external air entering through the air inlet 4. After the external air and the water vapor converge, the water vapor preheats the external air preliminarily, thereby forming a mixed air with a higher temperature. The converged air is synchronously sucked into the heating device through the exhaust device for heating. Since air is continuously drawn into the heating device, as the drawn air expands due to the heat, the internal air pressure of the heating device increases and the heated air is continuously and rapidly diverted to the inner tube 3 and the air outlet 5.

[0032] like Figure 3-Figure 5 As shown, in some embodiments, the top of the heating device is connected to the outlet of the exhaust device, and the bottom of the heating device is also provided with a first hot air outlet 21 and a second hot air outlet 22, respectively. The first hot air outlet 21 is connected to the inner cylinder 3, and the second hot air outlet 22 is connected to the air outlet 5. In a preferred embodiment, the heating device includes a heating coil fixing frame 8 and a heating coil 9 arranged in the heating coil fixing frame 8, as shown in FIG. Figure 5 , Figure 7 , Fig. 9 As shown, the first hot air outlet 21 and the second hot air outlet 22 are both arranged at the bottom of the heating coil fixing frame 8, and a plurality of guide plates 23 are obliquely arranged in the first hot air outlet 21, and the guide plates 23 are used to guide the flow direction of the hot air blowing into the inner tube 3 and prevent the hot air from flowing back. The inclination direction and inclination angle of the plurality of guide plates 23 are the same, and the inclination angle of the guide plates 23 can be adjusted as needed, which will not be elaborated here.

[0033] like Figure 4 , Figure 5As shown, in some embodiments, the second hot air outlet 22 is preferably located on a side close to the air outlet 5, and the cross-sectional area of ​​the second hot air outlet 22 should be smaller than the cross-sectional area of ​​the first hot air outlet 21, thereby ensuring that most of the hot air in the heating device is blown into the inner cylinder 3 from the first hot air outlet 21.

[0034] like Figure 5 , Figure 6 , Fig.10 As shown, in one embodiment, the exhaust device includes an exhaust fan 10 and a fan fixing frame 11 arranged at the bottom of the exhaust fan 10, the bottom of the fan fixing frame 11 is fixed to the top of the heating coil fixing frame 8, and a heating exhaust chamber is formed together inside the fan fixing frame 11 and the heating coil fixing frame 8, the exhaust device is arranged at the entrance of the heating exhaust chamber, the outlet of the heating exhaust chamber includes a first hot air outlet 21 and a second hot air outlet 22, and ensures that the hot air in the heating exhaust chamber only flows out from the two hot air outlets; in one embodiment, a temperature sensor 12 is also arranged in the heating device, and the temperature sensor 12 is arranged between the exhaust fan 10 and the heating coil 9, so as to sense the temperature inside the heating exhaust chamber in real time.

[0035] like Figure 5 , Fig.10 As shown, in one embodiment, a lining plate 13 is arranged between the upper shell 1 and the lower shell 2, and the lining plate 13 is also provided with a steam outlet 25 at the top of the steam channel 7, and the steam outlet 25 is arranged outside the heating exhaust chamber and connected to the confluence chamber 6, and the lining plate 13 is also provided with an avoidance hole for avoiding the first hot air outlet 21, so as to ensure that the upper and lower shells 2 are circulated only through the first hot air outlet 21 and the steam outlet 25, avoid the diffusion of hot air or water vapor, shorten the flow path as much as possible, and thus reduce heat loss; in one embodiment, the inner cylinder 3 also includes an inner cylinder upper cover 14, and the position of the inner cylinder upper cover 14 corresponding to the first hot air outlet 21 is also provided with an avoidance hole, and the inner cylinder upper cover 14 and the lining plate 13 can be connected by a snap.

[0036] In some embodiments, in order to further deodorize and filter the air exhausted from the food waste dryer, a filtering device is also provided inside the upper shell 1, and the inlet of the filtering device is connected to the second hot air outlet 22, and the outlet of the filtering device is connected to the air outlet 5.

[0037] like Figure 4-Figure 7 as well as Fig.10As shown, in a preferred embodiment, the filtering device includes an activated carbon box 16, and air holes are provided at the bottom and the top of the activated carbon box 16. The bottom of the activated carbon box 16 is spaced apart from the liner 13, wherein a limiting structure for supporting the activated carbon box 16 may be provided in the upper shell 1, thereby ensuring that a height interval is formed between the liner 13 and the bottom of the activated carbon box 16, and ensuring that the limiting structure does not completely block the air holes at the bottom of the activated carbon box 16. The limiting structure may refer to the prior art, such as limiting buckles, limiting pins, limiting blocks, bolts and other limiting structures, which will not be described in detail here. In other embodiments, a rubber pad 24 may be further provided between the activated carbon box 16 and the limiting structure at the bottom thereof, so as to further improve the sealing performance and provide a buffering effect between the activated carbon box 16 and the limiting structure. The second hot air outlet 22 is located between the activated carbon box 16 and the lining plate 13, so that part of the hot air in the heating exhaust chamber is introduced from the second hot air outlet 22 into the gap between the lining plate 13 and the bottom of the activated carbon box 16, and enters the activated carbon box 16 from the air holes at the bottom of the activated carbon box 16, and then flows out from the air holes at the top of the activated carbon box 16 to the air outlet 5 after being filtered by the activated carbon box 16.

[0038] like Fig.10 As shown, in one embodiment, the activated carbon box 16 is filled with activated carbon, and a box cover 1601 is provided on the top of the activated carbon box 16. A plurality of air holes are arranged on the box cover 1601. The box cover 1601 and the activated carbon box 16 are detachable structures, which is convenient for replacing the activated carbon inside the activated carbon box 16.

[0039] like Figure 4 , Figure 5 , Fig.10 As shown, in one embodiment, a control unit is further provided inside the upper shell 1, and the control unit at least includes a PCB controller 17 and a power switch connected to the PCB controller 17. The PCB controller 17 is connected to the heating coil 9, the exhaust fan 10 and the temperature controller through leads. In one embodiment, the PCB controller 17 and the power switch are closed by a power box 18 and isolated from the filtering device. The power cord enters from a power port provided outside the upper shell 1, passes through the confluence cavity 6 and the filtering device, and is inserted into the power PCB from the opening position on the side of the power box 18; the lead of the temperature sensor 12 is pulled out from the side hole provided on the heating coil fixing frame 8, passes through the filtering device, and is inserted into the control PCB from the opening position on the side of the power box 18. The wiring method of the heating coil 9 is the same as that of the temperature sensor 12, which will not be described in detail here.

[0040] like Figure 5 , Fig.10As shown, in one embodiment, an LED light source is provided in the control unit, and the LED light source is fixed on the lining plate 13, wherein the lining plate 13 is provided with an avoidance hole for the LED lamp 19, and the LED light source includes an LED lamp 19 and an LED lamp cover 20, and the LED lamp cover 20 is fixed in the avoidance hole for the LED lamp 19, so that the light beam emitted by the LED lamp 19 can pass through the LED lamp cover 20 to irradiate the interior of the lower shell 2, and the lead wire of the LED lamp 19 passes through the side hole of the power box 18 and is inserted into the power PCB; Figure 3 As shown, an observation notch 301 is provided at the top opening of the inner drum 3 on the side close to the LED light source, and a window cover 15 for observing the interior of the lower shell 2 is also provided between the upper shell 1 and the lower shell 2, so that the user can observe the drying situation in the inner drum 3 in real time.

[0041] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A kitchen waste dryer, comprising a detachable upper shell and a lower shell, wherein the lower shell comprises an inner cavity, wherein an inner cylinder for accommodating kitchen waste is arranged in the inner cavity, wherein a through hole is arranged at the bottom of the inner cylinder, and an air inlet and an air outlet are arranged on the upper shell, wherein: A confluence cavity is provided inside the upper shell body, the confluence cavity is communicated with the air inlet, and an exhaust device is provided inside the confluence cavity, a heating device is connected to the outlet of the exhaust device, the heating device is respectively communicated with the inner cylinder and the air outlet, the bottom and the outer periphery of the inner cylinder are spaced apart from the inner cavity, and a steam channel for accommodating kitchen waste wastewater and conveying water vapor formed by heating the kitchen waste is formed at the interval between the inner cylinder and the inner cavity, the steam channel is communicated with the confluence cavity, so that the water vapor enters the confluence cavity and merges with the external air entering through the air inlet, the merged air is synchronously sucked into the heating device for heating through the exhaust device, and the heated air is diverted to the inner cylinder and the air outlet.

2. The kitchen waste drying machine according to claim 1, characterized in that: The top of the heating device is connected to the outlet of the exhaust device, and the bottom of the heating device is also provided with a first hot air outlet and a second hot air outlet, respectively. The first hot air outlet is connected to the inner cylinder, and the second hot air outlet is connected to the air outlet.

3. The kitchen waste drying machine according to claim 2, characterized in that: The heating device includes a heating coil fixing frame and a heating coil arranged in the heating coil fixing frame, the first hot air outlet and the second hot air outlet are both arranged at the bottom of the heating coil fixing frame, and a plurality of guide plates are obliquely arranged in the first hot air outlet, and the inclination directions and inclination angles of the plurality of guide plates are the same.

4. The kitchen waste drying machine according to claim 3, characterized in that: The exhaust device includes an exhaust fan and a fan fixing frame arranged at the bottom of the exhaust fan, the bottom of the fan fixing frame is fixed to the top of the heating coil fixing frame, and a heating exhaust chamber is formed inside the fan fixing frame and the heating coil fixing frame.

5. The kitchen waste drying machine according to claim 4, characterized in that: A lining plate is arranged between the upper shell and the lower shell, and a steam outlet is also arranged at the top of the steam channel of the lining plate. The steam outlet is arranged outside the heating exhaust chamber and connected to the confluence chamber. The lining plate is also provided with an avoidance hole for avoiding the first hot air outlet.

6. The kitchen waste drying machine according to claim 4, characterized in that: A temperature sensor is also provided in the heating device, and the temperature sensor is provided between the exhaust fan and the heating coil.

7. The food waste drying machine according to claim 5, characterized in that: A filter device is further provided inside the upper shell, the inlet of the filter device is connected to the second hot air outlet, and the outlet of the filter device is connected to the air outlet.

8. The food waste drying machine according to claim 7, characterized in that: The filtering device comprises an activated carbon box, the bottom and the top of the activated carbon box are both provided with air holes, the bottom of the activated carbon box is spaced apart from the lining plate, and the second hot air outlet is located between the activated carbon box and the lining plate.

9. The food waste drying machine according to claim 1, characterized in that: A control unit is also provided inside the upper shell, and the control unit at least includes a PCB controller and a power switch connected to the PCB controller. The PCB controller is connected to the heating coil, the exhaust fan and the temperature controller through leads.

10. The food waste drying machine according to claim 9, characterized in that: An LED light source is arranged in the control part, and the LED light source is fixed on the lining plate. An observation notch is arranged at the top opening of the inner cylinder on the side close to the LED light source, and a window cover for observing the interior of the lower shell is also arranged between the upper shell and the lower shell.

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