Disinfection equipment

Abstract

The disinfection equipment comprises a disinfection cavity, a drawer box and a drawer panel, the drawer box is slidably connected into the disinfection cavity, a plurality of vent holes are formed in a bottom plate of the drawer box, and a ventilation gap is formed between the bottom plate and the bottom cavity wall of the disinfection cavity; the circulating air cavity is provided with a fan to form airflow circulation, the heater is used for heating air in the circulating air cavity, and the circulating air cavity is provided with an air inlet for sucking air in the disinfection cavity, a main circulating air outlet for blowing high-temperature hot air into the disinfection cavity and an in-drawer circulating air outlet in the cavity wall of the disinfection cavity. The main circulation air outlet is arranged at the position of the cavity wall and is suitable for enabling high-temperature hot air blown out by the main circulation air outlet to form circulation in the space above the drawer box, and the in-drawer circulation air outlet is arranged at the position of the cavity wall and is suitable for enabling the high-temperature hot air blown out by the in-drawer circulation air outlet to flow into the ventilation gap and flow into the drawer box through the ventilation hole and form circulation. The device has the beneficial effects that high-temperature hot air is contacted with all to-be-disinfected surfaces, and local omission or dead angles are avoided.

Description

Technical Field

[0001] This invention relates to a disinfection device, and more particularly to a disinfection device that can improve the disinfection coverage and eliminate disinfection dead spots. Background Technology

[0002] High-temperature hot air circulation is used as one of the disinfection methods in disinfection equipment. The cabinet is driven by a fan to blow air through a heater and then send it into the disinfection chamber. Continuous heat exchange is used to bring the surface of the items to the temperature required to inactivate microorganisms.

[0003] However, existing disinfection equipment has inherent limitations in the disinfection process: when items such as bowls and plates that need to be drained are placed upside down in the drawer, their concave bottom surfaces will form closed and shielded spaces, and the surfaces of the stacked items that are in close contact will also create unexposed areas; the closed or shielded areas formed by these items lack effective contact surfaces with high-temperature hot air, creating continuous disinfection dead zones, which restricts the coverage of disinfection and prevents it from fully covering the items to be disinfected. Summary of the Invention

[0004] The purpose of this invention is to provide a disinfection device that effectively overcomes obstructions by constructing a dual high-temperature hot air circulation system, allowing the high-temperature hot air to reach all surfaces to be disinfected, avoiding local omissions or dead corners, thereby ensuring comprehensive coverage and thoroughness of the disinfection effect.

[0005] The present invention is achieved through the following technical solution.

[0006] A disinfection device includes a disinfection chamber and a drawer box slidably connected inside the disinfection chamber for holding items to be disinfected. The bottom plate of the drawer box is provided with multiple ventilation holes, and there is a ventilation gap between the bottom plate and the bottom wall of the disinfection chamber.

[0007] In addition, a circulating air chamber equipped with a fan to form airflow circulation, and a heater for heating the air in the circulating air chamber to the disinfection standard are provided. The circulating air chamber has an air inlet, a main circulation outlet and an inner drawer circulation outlet on the cavity wall of the disinfection chamber. The main circulation outlet is located on the cavity wall at a position higher than the drawer box, so that the high-temperature hot air blown out of the main circulation outlet circulates in the space above the drawer box. The inner drawer circulation outlet is located on the cavity wall at a position corresponding to the ventilation gap, so that the high-temperature hot air blown out of the inner drawer circulation outlet flows into the ventilation gap, flows into the drawer box through the ventilation hole and forms a circulation.

[0008] As a further improvement of the present invention, the air inlet is arranged in the middle region of the rear cavity wall of the disinfection chamber, the main circulation air outlet is arranged on the rear cavity wall and located on both sides of the air inlet, and the drawer-in-the-drawer circulation air outlet is arranged on the rear cavity wall and located below the air inlet; the blowing direction of the main circulation air outlet is set to deflect towards the side cavity wall that is close to it, and the blowing direction of the drawer-in-the-drawer circulation air outlet is set to deflect towards the bottom cavity wall.

[0009] As a further improvement of the present invention, the bottom plate of the drawer box has multiple interleaved and relatively upward raised high-level structures and relatively downward lower-level structures; ventilation holes are distributed on the lower-level structures, so that a high-temperature hot air retention enhanced disinfection gap is formed between the items to be disinfected supported on the high-level structures and the lower-level structures covered by them.

[0010] As a further improvement of the present invention, multiple airflow channels are formed in the side panel of the drawer box, and its top surface is located within the blowing jet range of the main circulation air outlet; the airflow channels form an inlet on the top surface of the side panel and an outlet on the side of the side panel facing the space inside the drawer box, so that a portion of the high-temperature hot air blown out by the main circulation air outlet flows into the space inside the drawer box through the airflow channels.

[0011] As a further improvement of the present invention, the top surface of the side plate is inclined upward from its inner side to its outer side.

[0012] As a further improvement of the present invention, the airflow channel includes a vertical section, a horizontal section, and a connecting section. The vertical section connects to the inlet, the horizontal section connects to the outlet, and the connecting section connects the vertical section and the horizontal section and is curved.

[0013] As a further improvement of the present invention, an ultraviolet lamp is provided inside the disinfection chamber, and the arrangement of the ultraviolet lamp inside the disinfection chamber is suitable so that its light radiation range basically covers the drawer box.

[0014] As a further improvement of the present invention, the rear wall of the disinfection chamber is formed with a recessed portion, and a cover plate covering the recessed portion is provided on the rear wall. The cover plate, the recessed portion, and the cavity formed between them form a circulating air chamber. The air inlet, the main circulating air outlet, and the inner circulating air outlet are all formed on the cover plate.

[0015] As a further improvement of the present invention, the cover plate includes a middle plate, two side plates, and a bottom plate. The middle plate protrudes forward relative to the rear cavity wall. The two side plates transition obliquely from the two sides of the middle plate to the two sides corresponding to the recessed portion. The bottom plate transitions obliquely from the bottom edge of the middle plate to the bottom edge corresponding to the recessed portion. An air inlet is formed on the middle plate, a main circulation air outlet is formed on the two side plates, and an internal circulation air outlet is formed on the bottom plate.

[0016] As a further improvement of the present invention, the fan includes an impeller located inside the circulating air cavity and corresponding to the coverage area of ​​the middle plate, a driver disposed outside the circulating air cavity, the output shaft of the driver passing through the recess and driving the impeller; the heater includes a heating tube and surrounds the periphery of the impeller.

[0017] The beneficial effects of this invention are:

[0018] The ventilation holes on the bottom plate of the drawer box and the pre-reserved ventilation gap between them, along with the internal air circulation vents in specific locations, form a key airflow channel directly into the drawer box. This creates a bottom-up circulating airflow in areas with densely packed items to be disinfected, ensuring that even the bottom or obscured parts of the items are fully enveloped by high-temperature hot air. Simultaneously, the main air circulation vent, positioned higher, creates a horizontal circulating airflow above the drawer box, covering the surfaces of the items with its high-temperature hot air. This spatially separated yet collaborative dual-circulation design, with its upper horizontal circulation and lower bottom-up penetrating circulation, achieves three-dimensional airflow coverage within the disinfection chamber. Regardless of whether the items are stacked or placed upside down, such as when the inside of bowls or plates is obscured, the dual-circulation airflow effectively overcomes these obstacles, ensuring that the high-temperature hot air reaches all surfaces to be disinfected, preventing any omissions or dead zones, and thus guaranteeing comprehensive and thorough disinfection. Attached Figure Description

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0020] Figure 1 This is a schematic diagram of the disinfection equipment.

[0021] Figure 2 This is a cross-sectional schematic diagram of the disinfection equipment;

[0022] Figure 3 A schematic diagram of high-temperature hot air circulation in the sterilization chamber from a three-dimensional perspective;

[0023] Figure 4 A schematic diagram of high-temperature hot air circulation in the sterilization chamber from a cross-sectional view.

[0024] Figure 5 This is a schematic diagram of the drawer structure;

[0025] Figure 6 This is a partial sectional view of the drawer;

[0026] Figure 7 A schematic diagram of the rear wall of the disinfection chamber;

[0027] Figure 8 This is a schematic diagram of the internal structure of the circulating air chamber. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0030] Reference Figures 1-8 This embodiment illustrates a disinfection device designed to improve disinfection coverage and eliminate disinfection blind spots. See details... Figure 1 as well as Figure 2 The disinfection device in this embodiment includes a disinfection chamber 1 with an opening on the front. A drawer box 2, used to hold items to be disinfected (such as bowls, plates, chopsticks, etc.), is slidably connected inside the disinfection chamber 1. The drawer box 2 is connected to a drawer panel 21, which, when closed, provides an airtight seal with the opening of the disinfection chamber 1. The bottom plate 22 of the drawer box 2 is a key component of this embodiment, with multiple ventilation holes 221 distributed on it. Specifically, a ventilation gap d is maintained between the bottom plate 22 of the drawer box 2 and the bottom wall 12 of the disinfection chamber 1, allowing the flow of high-temperature hot air. This is the basis for achieving a specific airflow path subsequently.

[0031] Reference Figures 2-4 The disinfection equipment is equipped with a system for forming a high-temperature hot air circulation, including a circulating air chamber 3, a fan installed in the circulating air chamber 3, and a heater 4 for heating the air in the circulating air chamber 3 to a specified disinfection temperature standard. The circulating air chamber 3 functions through three openings set on the wall of the disinfection chamber 1: the air inlet 31 is responsible for continuously drawing air from the disinfection chamber 1 into the circulating air chamber 3; the main circulating air outlet 32 ​​and the drawer-side circulating air outlet 33 blow the high-temperature hot air treated by the heater 4 back to different areas of the disinfection chamber 1. The positioning of the main circulating air outlet 32 ​​on the chamber wall ensures that the high-temperature hot air blown out mainly acts on the space above the drawer box 2, forming a dominant circulating airflow in this area. The positioning of the drawer-side circulating air outlet 33 on the chamber wall ensures that the high-temperature hot air blown out can flow directionally into the ventilation gap d located between the bottom plate 22 and the bottom wall 12 of the disinfection chamber 1. After the hot air enters the ventilation gap d, it then rises through multiple ventilation holes 221 on the bottom plate 22 and finally enters the internal space of the drawer box 2, where it forms a bottom-up circulating airflow.

[0032] The disinfection equipment in this implementation case fundamentally solves the technical defect of existing disinfection equipment where high-temperature hot air cannot fully cover the surface due to the stacking posture of items by establishing a dual circulating airflow path. The ventilation gap d reserved between the ventilation hole 221 on the bottom plate 22 of the drawer box 2 and the bottom cavity wall 12, together with the internal circulating air outlet 33 at a specific position, constitutes a key airflow channel that directly reaches the inside of the drawer box 2. It forms a bottom-up circulating airflow in the dense area of ​​items to be disinfected, ensuring that the bottom or covered parts of the items to be disinfected are also fully surrounded by high-temperature hot air. At the same time, the main circulating air outlet 32, which is arranged at a higher position, is responsible for forming a horizontal circulating airflow in the space above the drawer box 2, and the high-temperature hot air blown out covers the surface of the items to be disinfected. This dual-circulation design, which separates spaces but operates in synergy, achieves three-dimensional coverage of airflow within the disinfection chamber through an upper horizontal circulation and a lower bottom-up permeation circulation. Regardless of whether the items to be disinfected are stacked or placed upside down, such as when the inside of bowls and plates is obstructed, the dual-circulation airflow can effectively overcome the obstruction and allow the high-temperature hot air to reach all surfaces to be disinfected, avoiding local omissions or dead corners, thereby ensuring the comprehensiveness and thoroughness of the disinfection effect.

[0033] More specifically, the disinfection equipment in this embodiment can be a multi-layer structure. As shown in the figure, the disinfection equipment has a double-layer structure, including two disinfection chambers 1 located in the upper and lower layers, and each of the two disinfection chambers 1 is equipped with a corresponding drawer box 2 and drawer panel 21.

[0034] Specifically, regarding the layout of the rear wall 11 of the disinfection chamber 1, the air inlet 31 is located in the middle area of ​​the rear wall 11, and two main circulation air outlets 32 are respectively arranged on the rear wall 11 and located on both sides of the air inlet 31. The drawer-side circulation air outlet 33 is arranged on the rear wall 11 and located below the air inlet 31. This spatial arrangement ensures that the airflow between the air intake at the air inlet 31 and the hot air blown out by each air outlet does not interfere with each other, and the airflow organization is clear and orderly. A further configuration is that the blowing direction of the main circulation air outlet 32 ​​is set to be deflected towards the adjacent side wall 13 of the disinfection chamber 1. This directional setting helps to guide the diffusion of high-temperature hot air in the horizontal direction, enabling it to diffuse more fully to the entire space above the drawer box 2, effectively expanding the coverage of the main circulation hot airflow. Meanwhile, the blowing direction of the air outlet 33 inside the drawer is set to be inclined towards the bottom wall 12 of the disinfection chamber 1. This downward guidance ensures that the hot air blown out can enter the ventilation gap d below the bottom plate 22 to the maximum extent and almost all of it, reducing airflow loss and providing a reliable airflow source for effective circulation inside the drawer box 2.

[0035] Reference Figure 5 , Figure 6 and combined Figure 3The bottom plate 22 of the drawer box 2 has multiple interlocking morphological units on its surface. Some of these units are relatively upward-raised high structures 222, while others are relatively downward-sunken low structures 223. The crucial ventilation holes 221 are all distributed on the low structures 223. This design offers multiple practical benefits: First, when users place bowls, plates, and other tableware that may have some residual water after washing upside down in the drawer box 2, the bottom edge of the tableware usually falls naturally onto the high structure 222. This means that the area covered by the upside-down tableware is directly below the low structure 223 and its ventilation holes 221, preventing the tableware from directly pressing down on and blocking the ventilation holes 221, thus ensuring unobstructed airflow. Second, a relatively narrow space is inevitably formed between the tableware supported on the high structure 222 and the top surface of the low structure 223 below it, creating a reinforced disinfection gap. This gap allows continuously flowing high-temperature air to linger and undergo slow, thorough exchange. As a result, even areas inside upside-down bowls and plates that are usually difficult to reach directly by the main airflow and are prone to becoming disinfection dead zones can be continuously penetrated and disinfected by high-temperature air, significantly improving the disinfection effect on the inner surface of the container.

[0036] To further enhance the disinfection efficiency of the drawer box 2's interior space, this design integrates multiple airflow channels 24 within the side panels 23 of the drawer box 2. The top surfaces of these side panels 23 are positioned within the effective range of the high-temperature hot air jets blown from the main circulation outlet 32. Each airflow channel 24 has an inlet 241 on the top surface of the side panel 23 and an outlet 242 on the side of the side panel 23 facing the interior space of the drawer box 2. This configuration allows a portion of the high-temperature hot air blown from the main circulation outlet 32 ​​and flowing through the space above the drawer box 2 to be captured by the inlet 241 on the top surface of the side panel 23. The captured hot air then passes through the airflow channels 24 within the side panel 23 and is finally blown into the interior space of the drawer box 2 from the side outlet 242. This effectively opens a new circulation path for high-temperature hot air in addition to the aforementioned two circulation methods, allowing the high-temperature hot air to be blown horizontally into the drawer box 2, supplementing the airflow disturbance intensity inside the drawer box 2, helping to reduce potential flow blind spots, and further improving the disinfection effect within the drawer box 2.

[0037] To improve the efficiency of capturing the main circulating airflow, the top surface of the side panel 23 of the drawer box 2 is constructed to slope upwards from its inner edge (towards the center of the drawer box 2) to its outer edge (towards the side wall of the disinfection chamber 1). This upward-sloping structure increases the projected area of ​​the inlet 241 of the airflow channel 24 in the vertical direction and the effective windward surface for the flowing hot air, thereby intercepting and guiding more of the main circulating hot airflow flowing above it into the channel, increasing the total amount of hot air introduced into the drawer box 2, and thus further improving the disinfection effect inside the drawer box 2.

[0038] The internal path of the airflow channel 24 typically consists of three main parts: a vertical section 243 connected to the top inlet 241, a horizontal section 244 connected to the side outlet 242, and a connecting section 245 connecting the vertical section 243 and the horizontal section 244. This connecting section 245 is curved. This curved transition significantly reduces the flow resistance encountered by the high-temperature hot airflow when changing direction within the channel, allowing the airflow to pass through the channel more smoothly. Ultimately, this increases the flow rate and stability of the high-temperature hot airflow blown out from the side outlet 242, ensuring the continuous and effective output of this auxiliary airflow.

[0039] In addition to high-temperature hot air sterilization, this sterilization equipment solution also integrates ultraviolet (UV) sterilization. UV lamps 5 are installed inside the sterilization chamber 1. The installation position of the UV lamps 5 within the sterilization chamber 1 is determined based on the space and internal layout of the chamber, but it is necessary to ensure that their light radiation range is set to substantially cover the space occupied by the drawer box 2. For example... Figure 2 As shown, the ultraviolet lamps 5 in the upper disinfection chamber 1 are arranged on the top wall of the chamber, while the ultraviolet lamps 5 in the lower disinfection chamber 1 are arranged on the rear wall 11. The ultraviolet radiation emitted by the ultraviolet lamps 5 works synergistically with the high-temperature hot air disinfection to kill microorganisms in two ways. Especially in areas where the high-temperature hot air flow is relatively slow or difficult to directly clean the surface of items, the ultraviolet light can provide effective supplementary disinfection, thus achieving a more comprehensive and thorough disinfection effect overall.

[0040] Reference Figure 7 , Figure 8 and combined Figure 2 The circulating air chamber 3 is formed as follows: the rear wall 11 of the disinfection chamber 1 is machined into a recessed portion 111, and a cover plate 112 covers and seals this recessed portion 111. The cover plate 112 and the recessed portion 111 together form a sealed cavity, which serves as the circulating air chamber 3. The air inlet 31, the main circulating air outlet 32, and the inner drawer circulating air outlet 33 required for the circulating air chamber 3 are all located on the cover plate 112 covering the recessed portion 111.

[0041] The specific shape of the cover plate 112 is determined by functional requirements and includes: a central plate 1121 that protrudes forward relative to the plane of the rear cavity wall 11; two side plates 1122 that extend obliquely from the left and right edges of the central plate 1121 to the corresponding left and right edges of the recessed portion 111; and a bottom plate 1123 that extends obliquely from the bottom edge of the central plate 1121 to the corresponding bottom edge of the recessed portion 111. According to their positions, the air inlet 31 is located on the forward-protruding central plate 1121; two main circulation air outlets 32 are located on the oblique side plates 1122 on the left and right sides respectively; and the drawer-in-drawer circulation air outlet 33 is located on the oblique bottom plate 1123 at the bottom. This shape of the cover plate 112, along with the distribution of its various functional ports, works together to achieve efficient and low-interference airflow organization and realizes the predetermined blowing direction of the main circulation air outlets 32 and the drawer-in-drawer circulation air outlets 33.

[0042] The fan structure includes an impeller 34 located inside the circulation chamber 3, the position of which corresponds to the coverage area of ​​the central plate 1121 of the cover plate 112. The fan's power source is a driver 35 (typically an electric motor), which is mounted externally to the circulation chamber 3. The output shaft of the driver 35 extends through the wall of the recess 111 into the circulation chamber 3 and is centrally connected to the impeller 34 to drive its rotation. External mounting of the driver 35 saves internal space in the circulation chamber 3. The heater 4 is in the form of a heating tube, its installation position determined to be surrounding the impeller 34. When the fan impeller 34 is driven to rotate by the driver 35, air is forced into the circulation chamber 3 through the inlet 31. The drawn-in air first flows through the heating tube surrounding the impeller 34, where it is rapidly heated to the set high-temperature disinfection temperature. The heated air is then pressurized by the rotating impeller 34 and, according to the airflow path settings, is blown out through the main circulation outlet 32 ​​and the inner drawer circulation outlet 33, entering the corresponding areas of the disinfection chamber 1. After disinfecting the items, the blown-out hot air is drawn back into the circulation chamber 3 through the air inlet 31, forming a continuous heating and circulation process. This spatial arrangement of the impeller 34 and the surrounding heating tubes achieves a functional combination of efficient air heating and delivery.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A disinfecting apparatus, characterized by, The sterilization cavity (1), the drawer box (2) slidably connected in the sterilization cavity (1) and used for carrying the articles to be sterilized, the bottom plate (22) of the drawer box (2) is arranged with a plurality of ventilation holes (221), and there is a ventilation gap (d) between the bottom plate (22) and the bottom cavity wall (12) of the sterilization cavity (1); And, a circulating air cavity (3) configured with a fan to form air circulation, a heater (4) for heating the air in the circulating air cavity (3) to a sterilization standard, the circulating air cavity (3) is formed with an air inlet (31), a main circulating air outlet (32) and an inner-drawer circulating air outlet (33) on the cavity wall of the sterilization cavity (1), the main circulating air outlet (32) is arranged at a position higher than the drawer box (2) on the cavity wall, so that the high-temperature hot air blown out of the main circulating air outlet (32) forms a circulation in the space above the drawer box (2), and the inner-drawer circulating air outlet (33) is arranged at a position corresponding to the ventilation gap (d) on the cavity wall, so that the high-temperature hot air blown out of the inner-drawer circulating air outlet (33) flows into the ventilation gap (d), flows into the drawer box (2) through the ventilation holes (221) and forms a circulation.

2. The sanitization device of claim 1, wherein, The air inlet (31) is arranged in the middle region of the rear cavity wall (11) of the sterilization cavity (1), the main circulating air outlet (32) is arranged on the rear cavity wall (11) and located at the two side regions of the air inlet (31), and the inner-drawer circulating air outlet (33) is arranged on the rear cavity wall (11) and located at the lower region of the air inlet (31); the blowing direction of the main circulating air outlet (32) is arranged to be inclined towards the side cavity wall (13) close to it, and the blowing direction of the inner-drawer circulating air outlet (33) is arranged to be inclined towards the bottom cavity wall (12).

3. The sanitization device of claim 2, wherein, The bottom plate (22) of the drawer box (2) has a plurality of high-position structures (222) arranged in a staggered manner and relatively upwardly protruding and low-position structures (223) relatively downwardly descending; the ventilation holes (221) are distributed on the low-position structures (223), so that the articles to be sterilized supported on the high-position structures (222) and the low-position structures (223) covered thereby form a reinforced sterilization gap in which high-temperature hot air is retained.

4. The sanitization device of claim 2, wherein, A plurality of air flow channels (24) are formed in the side plate (23) of the drawer box (2), and the top surface of the side plate (23) is located in the blowing jet range of the main circulating air outlet (32); the air flow channel (24) forms an inlet (241) on the top surface of the side plate (23), and the air flow channel (24) forms an outlet (242) on the side surface of the side plate (23) facing the space in the drawer box (2), so that part of the high-temperature hot air blown out of the main circulating air outlet (32) flows into the space in the drawer box (2) through the air flow channel (24).

5. The sanitization device of claim 4, wherein, The top surface of the side plate (23) is upwardly inclined from the inner side to the outer side, so as to expand the capture range of the inlet (241) of the air flow channel (24) to the high-temperature hot air.

6. The sanitization device of claim 4, wherein, The air flow channel (24) comprises a vertical section (243) communicating with the inlet (241), a horizontal section (244) communicating with the outlet (242), and a connecting section (245) connecting the vertical section (243) and the horizontal section (244) and being arc-bent.

7. The sanitization device of claim 1, wherein, The disinfection cavity (1) is provided with an ultraviolet lamp (5), and the arrangement position of the ultraviolet lamp (5) in the disinfection cavity (1) is suitable for making the light irradiation range of the ultraviolet lamp (5) basically cover the drawer box (2).

8. The sanitization device of claim 2, wherein, The rear cavity wall (11) of the disinfection cavity (1) is formed with a recessed portion (111) recessed rearward, the rear cavity wall (11) is provided with a cover plate (112) covering the recessed portion (111), the cover plate (112), the recessed portion (111) and the cavity formed between the cover plate (112) and the recessed portion (111) form the circulating air cavity (3), and the air inlet (31), the main circulating air outlet (32) and the drawer-internal circulating air outlet (33) are all formed on the cover plate (112).

9. The sanitization device of claim 8, wherein, The cover plate (112) comprises a middle plate (1121), two side plates (1122) and a bottom plate (1123), the middle plate (1121) is protruded forward relative to the rear cavity wall (11), the two side plates (1122) are obliquely transitioned from two side edges of the middle plate (1121) to corresponding two side edges of the recessed portion (111), and the bottom plate (1123) is obliquely transitioned from a bottom edge of the middle plate (1121) to a corresponding bottom edge of the recessed portion (111); the air inlet (31) is formed on the middle plate (1121), the main circulating air outlet (32) is formed on the two side plates (1122), and the drawer-internal circulating air outlet (33) is formed on the bottom plate (1123).

10. The sanitization device of claim 9, wherein, The fan comprises an impeller (34) located in the circulating air cavity (3) and corresponding to the cover range of the middle plate (1121), and a driver (35) arranged outside the circulating air cavity (3), an output shaft of the driver (35) penetrates the recessed portion (111) and drives the impeller (34) in a connected manner, and the heater (4) comprises a heating pipe and surrounds the periphery of the impeller (34).

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