A drawer-type microwave oven

Abstract

The present application relates to the technical field of household appliances, and provides a drawer type microwave oven, which comprises a shell, a heat insulation cavity assembly, a hot air assembly, a heat dissipation fan assembly and a magnetron; the heat insulation cavity assembly comprises a cooking cavity and a heat insulation frame; the heat insulation frame covers the hot air assembly, and also at least partially covers the cooking cavity; the heat dissipation fan assembly is arranged between the shell and the heat insulation cavity assembly; the magnetron is arranged at an outlet of the heat dissipation fan assembly; an air inlet hole part and an air outlet hole part are arranged on the cooking cavity; the air inlet hole part comprises first air inlet holes and second air inlet holes, which are symmetrically arranged on two cavity side plates; and the air outlet hole part is arranged on a cavity back plate.The drawer type microwave oven provided by the present application significantly reduces the heat dissipation difficulty of the electrical elements outside the cooking cavity by arranging a heat insulation structure on the periphery of the cooking cavity, simplifies the heat dissipation structure, and the heat dissipation structure has low energy consumption and high utilization rate; meanwhile, the hot air assembly is optimized, and the heating uniformity is improved.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more specifically, to a drawer-type microwave oven. Background Technology

[0002] With the increasing demand for integrated kitchen appliances and space optimization, drawer-type microwave ovens, with their built-in installation and space-saving features, have gradually become an important piece of equipment in modern home and commercial kitchens. Among them, drawer-type microwave ovens with hot air circulation components are widely favored for their ability to diversify cooking functions and enhance the aesthetics of the kitchen.

[0003] Since drawer-type microwave ovens are typically embedded in kitchen spaces, the heat accumulation problem in their cooking cavity and components such as the magnetron and high-voltage transformer is particularly prominent due to the limited installation space of the sliding rails and the user's need for pulling and drawing out the food. This has become one of the key bottlenecks restricting their operational stability and safety. To address this, Chinese Patent Application No. 201911269016.1, the applicant's earlier application, discloses a drawer-type microwave oven. It uses a first fan and a second fan on the rear side to dissipate heat from the inverter power supply and magnetron, respectively, to meet their cooling needs. Simultaneously, the second fan drives some air into the cooking cavity to remove moisture and fumes. However, this drawer-type microwave oven has a complex heat dissipation structure and suffers from high energy consumption and low efficiency. Furthermore, the hot air assembly is located on the top wall of the cooking cavity, resulting in uneven hot air circulation, uneven heating of food, and poor cooking performance. Additionally, the hot air blows downwards from the top, and some heat may be reflected back from the bottom, causing heat to accumulate at the top while the bottom remains cold, reducing thermal efficiency and necessitating longer cooking times or increased energy consumption.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The purpose of this invention is to propose a drawer-type microwave oven to solve the problems of complex heat dissipation structure, high energy consumption and low utilization rate in existing drawer-type microwave ovens. In addition, the hot air assembly is set on the top wall of the cooking cavity, resulting in uneven hot air circulation, uneven heating of food, poor cooking effect, and hot air blowing from the top down. Some heat may be reflected back to the top from the bottom, causing heat to accumulate at the top while the bottom temperature is insufficient, reducing thermal efficiency and requiring extended cooking time or increased energy consumption.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A drawer-type microwave oven, the drawer-type microwave oven comprising:

[0008] case;

[0009] A heat-insulating cavity assembly is disposed inside the housing, the heat-insulating cavity assembly includes a cooking cavity and a heat-insulating frame, and a heat-insulating element is disposed between the heat-insulating frame and the cooking cavity;

[0010] A hot air assembly for generating circulating air within the cooking cavity, the heat insulation rack covering the hot air assembly, and the heat insulation rack also at least partially covering the cooking cavity;

[0011] A cooling fan assembly is disposed between the housing and the heat insulation cavity assembly;

[0012] A magnetron, used to emit microwaves into the cooking cavity, is disposed at the outlet of the heat dissipation fan assembly;

[0013] An air inlet and an air outlet are provided on the cooking cavity. The hot air assembly communicates with the cooking cavity through the air inlet and the air outlet. The cooking cavity includes a rear plate and two oppositely arranged side plates. The air inlet includes a first air inlet and a second air inlet, which are symmetrically arranged on the two side plates. The air outlet is located on the rear plate.

[0014] Furthermore, the housing includes a connected rear side plate and a bottom plate, a first air inlet structure is provided on the rear side plate and / or the bottom plate, and a frequency converter plate is provided between the first air inlet structure and the outlet end of the fan assembly.

[0015] Furthermore, the drawer-type microwave oven also includes a partition, the two sides of which are connected to the rear panel and the rear side panel of the cavity, respectively. The partition cooperates with the heat dissipation fan assembly to divide the rear area of ​​the cooking cavity into a first cavity and a second cavity. The heat dissipation fan assembly is arranged on the upper part of the first cavity. The heat dissipation fan assembly is used to drive outside air to enter the first cavity and the second cavity sequentially through the first air inlet structure to form a first heat dissipation air duct.

[0016] Furthermore, the cooking cavity includes a cavity front panel, and the cavity front panel is provided with an exhaust port on the side near the heat dissipation fan assembly. The airflow from the second cavity and the exhaust port form a second heat dissipation duct. The drawer-type microwave oven also includes a lighting assembly and a stirring motor of a stirring device, and the lighting assembly and stirring motor are located in the second heat dissipation duct.

[0017] Furthermore, a second air inlet structure and an air guide are provided in the second cavity. The second air inlet structure is located on the bottom plate and close to the partition. The air guide is located on the side of the rear plate of the cavity away from the heat dissipation fan assembly. A third heat dissipation air duct is formed between the second air inlet structure and the air guide. The electronic control board is located in the third heat dissipation air duct. A fourth heat dissipation air duct is formed between the air guide and the exhaust port.

[0018] Furthermore, a first air inlet and a first air outlet are provided on the side panel of the cavity near the front panel of the cavity. The first air inlet and the first air outlet are symmetrically arranged on the two side panels of the cavity. The first air inlet and the first air outlet are both connected to the fourth heat dissipation duct. An air guide is provided on the side of the cooking cavity. The air guide covers the first air outlet, and the outlet end of the air guide is located near the exhaust port.

[0019] Furthermore, a horizontally placed mounting plate is provided on the top of the first cavity. One side of the mounting plate is connected to the right side plate and the rear plate of the cavity. A waveguide box is provided on the top of the cooking cavity. The other side of the mounting plate is fixedly connected to the waveguide box. There is a gap between the mounting plate and the heat dissipation fan assembly.

[0020] Furthermore, the cavity side plate includes:

[0021] Side panel body, the side panel body is vertically disposed on both sides of the bottom wall of the cooking cavity;

[0022] An air guide plate is provided above the side panel body and is inclined towards the center of the cooking cavity, and the air inlet is provided on the air guide plate.

[0023] Furthermore, the air guide plate is tilted at an angle α towards the center of the cooking cavity, where α is 25~65°.

[0024] Furthermore, the height of the air outlet is lower than the height of the air inlet.

[0025] Furthermore, the hot air assembly includes:

[0026] A circulation assembly located at the rear of the cooking cavity;

[0027] The heating components are located on the side of the cooking cavity. The circulation component, the heating components, and the cooking cavity are interconnected. There are two heating components located on the left and right sides of the cooking cavity. The heating components are positioned at the corresponding positions of the air inlet.

[0028] Furthermore, the loop component includes:

[0029] A circulating fan is provided, which is located on the rear side of the rear plate of the cavity and at the corresponding position of the air outlet.

[0030] A fan cover is installed on the rear plate of the cavity, and the circulating fan is installed inside the fan cover.

[0031] Furthermore, the heating assembly includes:

[0032] A heating element is disposed on the outside of the air guide plate and at a corresponding position in the air inlet.

[0033] The mounting cover is installed on the air guide plate, the heating element is installed inside the mounting cover, and the mounting cover is connected to the fan cover through a communication port.

[0034] Furthermore, the drawer-type microwave oven also includes a drawer assembly and a cabinet. The cabinet includes a shell and a cooking cavity. Both the shell and the cooking cavity are provided with openings corresponding to the drawer assembly. The drawer assembly can be opened to cover the openings.

[0035] Furthermore, the drawer assembly includes a mounting portion and a support portion, the mounting portion being capable of mounting the heated object; the support portion being capable of supporting the mounting portion; and the lowest position of the air outlet portion being lower than the lowest position of the support portion.

[0036] Compared with the prior art, the drawer-type microwave oven of the present invention has the following advantages:

[0037] 1) The drawer-type microwave oven of the present invention utilizes a heat insulation rack and heat insulation components in synergy to effectively prevent heat transfer from the cooking cavity to the outside. On the one hand, it provides heat insulation and reduces overall heat loss while significantly reducing the heat dissipation difficulty of external electrical components in the cooking cavity. A single cooling fan assembly can meet the heat dissipation needs of components such as the magnetron, improving the utilization rate of the cooling fan assembly and reducing energy consumption. On the other hand, it can simultaneously concentrate heat in the cooking cavity, ensuring a good heating rate within the cavity, enabling it to reach the required cooking temperature relatively quickly, improving thermal efficiency, greatly reducing cooking time, and thus reducing energy consumption. In addition, the synergistic effect of the heat insulation rack and heat insulation components also enhances the overall structural rigidity, reduces the risk of deformation caused by thermal expansion during cooking, and improves the safety of the drawer-type microwave oven.

[0038] 2) In the drawer-type microwave oven described in this invention, the magnetron is placed directly at the outlet of the cooling fan assembly, and efficient heat dissipation is achieved by using forced convection, which reduces energy consumption, improves the utilization rate of the cooling fan assembly, and extends the life of the magnetron.

[0039] 3) In the drawer-type microwave oven of the present invention, the heat dissipation fan assembly horizontally exhausts air to the upper part of the second cavity, thereby forming a negative pressure zone in the lower part of the second cavity. No additional fan is required. Outside air enters the second cavity under negative pressure through the second air inlet structure, which reduces energy consumption and dissipates heat from the control board. Most of the air flows out from the top of the second cavity, while some air flows to the side of the cooking cavity through the air guide, which reduces energy consumption and dissipates heat from components such as the drive motor located on the side of the cooking cavity.

[0040] 4) The drawer-type microwave oven of the present invention has a fourth air duct on the side of the cooking cavity that can make the pressure of the first air inlet higher than the pressure of the first air outlet, so that a small portion of the air enters the cooking cavity to remove the generated oil droplets, water vapor, odors, etc., thereby improving the taste and quality of the cooked food.

[0041] 5) The drawer-type microwave oven of the present invention has a first air inlet and a second air inlet symmetrically arranged on the two cavity side panels, which facilitates the uniform entry of circulating air and improves heating uniformity. The air outlet is located on the rear panel of the cavity, and the height of the air outlet is lower than that of the air inlet. The lowest position of the air outlet is lower than the lowest position of the support. The air outlet, together with the first and second air inlets, forms a "front-to-rear air inlet - rear-to-upper air outlet" circulation path. On the one hand, it forces hot air to penetrate the food layer, forming a three-dimensional hot air circulation system. The three-dimensional hot air circulation system and microwave heating work together to achieve a three-dimensional heating effect, which greatly improves heating uniformity and cooking effect. On the other hand, when the user pulls out the drawer assembly, there is no need to worry about hot air blowing directly onto the hand, reducing the risk of burns, improving user operating comfort, and ensuring high safety. In addition, when the drawer assembly is fully pulled out, it will not shake due to hot air disturbance, improving the stability of the drawer assembly when fully pulled out. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the drawer-type microwave oven of the present invention in the open state;

[0043] Figure 2 This is a schematic diagram of the overall structure of the drawer-type microwave oven described in this invention;

[0044] Figure 3 This is a schematic diagram of the structure of the drawer-type microwave oven of the present invention with the rear side panel hidden;

[0045] Figure 4 This is a schematic diagram of the structure of the drawer-type microwave oven described in this invention on the rear side of the hidden top panel;

[0046] Figure 5 This is a schematic diagram of the structure of the drawer-type microwave oven described in this invention after the left side panel is hidden;

[0047] Figure 6 for Figure 2 Schematic diagram of the longitudinal interface along side AA;

[0048] Figure 7 This is a schematic diagram of the internal structure of the drawer-type microwave oven described in an embodiment of the present invention;

[0049] Figure 8 This is a cross-sectional view of the drawer-type microwave oven described in an embodiment of the present invention;

[0050] Figure 9 This is a three-dimensional structural diagram of the cooking cavity of the drawer-type microwave oven according to an embodiment of the present invention;

[0051] Figure 10 This is a partially exploded structural diagram of the drawer-type microwave oven described in an embodiment of the present invention;

[0052] Figure 11 for Figure 10 Enlarged structural diagram at point A;

[0053] Figure 12 This is an exploded structural diagram of the drawer assembly of the drawer-type microwave oven according to an embodiment of the present invention;

[0054] Figure 13 This is a three-dimensional structural diagram of the rear cavity panel of the drawer-type microwave oven described in an embodiment of the present invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] 100. Housing; 101. First air inlet structure; 102. Second air inlet structure; 10. Shell; 11. Top plate; 12. Left side plate; 13. Right side plate; 14. Rear side plate; 141. Protrusion; 15. Bottom plate; 16. Partition plate; 17. Mounting plate; 20. Cooking cavity; 21. Rear plate of cavity; 211. Air guide vent; 22. Front plate of cavity; 221. Exhaust vent; 23. U-shaped frame; 231. First air inlet; 232. First air outlet; 24. Bottom wall of cavity; 25. Air guide component; 26. Heat insulation rack; 27. Side plate of cavity; 271. First air inlet hole; 272. Second air inlet hole; 273. Air outlet section; 274. Side plate body; 275. Air guide plate; 28. Cavity Top wall; 30, First cavity; 31, Heat dissipation fan assembly; 40, Second cavity; 41, Magnetron; 42, Electrical control board; 43, Waveguide box; 44, Stirring motor; 50, Hot air assembly; 51, Circulation assembly; 511, Circulation fan; 512, Fan cover; 52, Heating assembly; 521, Heating element; 522, Mounting cover; 55, Connecting port; 60, Lighting assembly; 70, Drive motor; 80, Guide rail assembly; 9, Drawer assembly; 90, Steam flow space; 91, Door; 92, Placement part; 921, Drawer tray; 922, Cooking tray; 9221, First tray; 9222, Second tray; 9223, Through hole; 93, Support part; 300, Control box. Detailed Implementation

[0057] To make the technical means and objectives and effects of the present invention easier to understand, the embodiments of the present invention will be described in detail below with reference to specific illustrations.

[0058] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0059] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0062] Example 1

[0063] In the existing technology, the heat dissipation structure of drawer-type microwave ovens is relatively complex and has the problem of low energy efficiency. At the same time, the hot air assembly 50 is set on the top wall of the cooking cavity 20, resulting in uneven hot air circulation, uneven heating of food, poor cooking effect, and hot air blowing from the top down. Some heat may be reflected back to the top by the bottom, causing heat to accumulate at the top while the bottom temperature is insufficient, reducing thermal efficiency and requiring extended cooking time or increased energy consumption.

[0064] To solve the above technical problems, such as Figures 1-13 As shown, this embodiment proposes a drawer-type microwave oven, which includes:

[0065] Casing 10,

[0066] A heat-insulating cavity assembly is disposed inside the housing 10. The heat-insulating cavity assembly includes a cooking cavity 20 and a heat-insulating frame 26. The heat-insulating frame 26 covers the hot air assembly 50 and at least partially covers the cooking cavity 20. A heat-insulating element is disposed between the heat-insulating frame 26 and the cooking cavity 20.

[0067] Hot air assembly 50, the hot air assembly 50 being used to generate circulating air within the cooking cavity 20;

[0068] A heat dissipation fan assembly 31 is disposed between the housing 10 and the heat insulation cavity assembly;

[0069] A magnetron 41 is used to emit microwaves into the cooking cavity 20, and the magnetron 41 is disposed at the outlet of the heat dissipation fan assembly 31.

[0070] An air inlet and an air outlet 273 are provided on the cooking cavity 20. The hot air assembly 50 communicates with the cooking cavity 20 through the air inlet and the air outlet 273. The cooking cavity 20 includes a cavity rear plate 21 and two cavity side plates 27 arranged opposite to each other. The air inlet includes a first air inlet 271 and a second air inlet 272. The first air inlet 271 and the second air inlet 272 are symmetrically arranged on the two cavity side plates 27. The air outlet 273 is provided on the cavity rear plate 21.

[0071] This embodiment proposes a drawer-type microwave oven. First, the heat insulation rack 26 and the heat insulation component work together to effectively prevent heat from the cooking cavity 20 from being transferred to the outside. On the one hand, it plays a role in heat insulation and heat resistance, reducing the overall heat loss of the machine and significantly reducing the heat dissipation difficulty of external electrical components in the cooking cavity 20. A single cooling fan assembly 31 can meet the heat dissipation needs of components such as the magnetron 41, improving the utilization rate of the cooling fan assembly 31 and reducing energy consumption. On the other hand, it can simultaneously concentrate heat in the cooking cavity 20, ensuring a good heating rate inside the cavity, and can reach the required cooking temperature relatively quickly, improving thermal efficiency, greatly reducing cooking time, and thus reducing energy consumption. In addition, the synergistic effect of the heat insulation rack 26 and the heat insulation component also enhances the overall structural rigidity, reduces the risk of deformation caused by thermal expansion during cooking, and improves the safety of the drawer-type microwave oven. Second, the cooling fan assembly 31 is independent of the cooking chamber 20, avoiding airflow distribution conflicts caused by the sharing of hot air and cooling ducts, and improving heat dissipation efficiency. Third, the magnetron 41 is directly placed at the outlet of the cooling fan assembly 31, using forced convection to achieve efficient heat dissipation, reducing energy consumption and extending the life of the magnetron 41. Fourth, the first air inlet 271 and the second air inlet 272 are symmetrically arranged on the two chamber side plates 27, which is conducive to the uniform entry of circulating air and improves heating uniformity. The air outlet 273 is arranged on the rear plate 21 of the chamber. The air outlet 273, together with the first air inlet 271 and the second air inlet 272, forms a reasonable air inlet and outlet path, promoting more uniform circulation of hot air in the heating chamber, thereby improving the heating uniformity of food, resulting in better cooking effect and improving user satisfaction.

[0072] As a preferred example of this application, the height of the air outlet portion 273 is lower than the height of the air inlet portion.

[0073] The first air inlet 271 and the second air inlet 272 are symmetrically arranged on the two cavity side plates 27, which is conducive to the uniform entry of circulating air and improves the heating uniformity. The air outlet 273 is arranged on the cavity rear plate 21. The height of the air outlet 273 is lower than the height of the air inlet. The air outlet 273, together with the first air inlet 271 and the second air inlet 272, forms a "front-to-rear air inlet" circulation path, which forces hot air to penetrate the food layer and forms a three-dimensional hot air circulation system. The three-dimensional hot air circulation system and microwave heating work together to achieve a three-dimensional heating effect, which greatly improves the heating uniformity and cooking effect.

[0074] Specifically, the heat insulation component is not specifically limited.

[0075] As an example of the invention, the heat insulation element is heat insulation cotton or heat insulation board.

[0076] As a preferred example of this application, the housing 10 includes a connected rear side plate 14 and a bottom plate 15, a first air inlet structure 101 is provided on the rear side plate 14 and / or the bottom plate 15, and a frequency converter plate is provided between the first air inlet structure 101 and the outlet end of the heat dissipation fan assembly 31.

[0077] This configuration allows outdoor air to pass through the inverter board and magnetron 41 sequentially, dissipating heat from them in turn. A single cooling fan assembly 31 simultaneously meets the heat dissipation needs of both the inverter board and the magnetron 41. Specifically, the inverter board, while highly sensitive to temperature rise, generates relatively low total heat; therefore, it is cooled first with fresh, cold air to ensure its chip junction temperature is ≤65℃. Meanwhile, the magnetron 41, as a high-power heat source, can still be effectively cooled by the air preheated by the inverter board, resulting in a more compact structure. The inverter board can be positioned between the inlet of the cooling fan assembly 31 and the first air inlet structure 101, or it can be located within the cooling fan assembly 31.

[0078] In this embodiment, a first air inlet structure 101 is provided on the rear side plate 14 and the bottom plate 15.

[0079] As an example of the present invention, the housing 10 includes a connected rear side plate 14 and a bottom plate 15, and the first air inlet structure 101 includes ventilation holes disposed on at least one of the rear side plate 14 and / or the bottom plate 15. This arrangement allows the drawer-type microwave oven to have a large air inlet area and low air inlet resistance, thereby further improving heat dissipation efficiency. Preferably, a support leg is provided below the bottom plate 15. This arrangement ensures that there is a gap between the bottom plate 15 and the bottom wall of the embedded space, thereby facilitating the entry of outside air.

[0080] As a preferred example of this application, the housing 10 further includes a left side panel 12 and a right side panel 13, and the first air inlet structure 101 further includes ventilation holes disposed on the left side panel 12 or the right side panel 13. This arrangement allows air to enter from the bottom, rear, and sides of the drawer-type microwave oven simultaneously, avoiding the situation where individual ventilation holes are blocked, thus preventing effective heat dissipation and resulting in more stable heat dissipation.

[0081] In this embodiment, as Figure 6 As shown, a first air inlet structure 101 is provided on the right side plate 13.

[0082] As a preferred example of this application, the rear side panel 14 protrudes to the side away from the cooking cavity 20 to form a protrusion 141. This arrangement ensures that there is a gap between the rear side panel 14 and the rear wall of the embedded space, allowing for smoother air intake. The housing 10 also includes a top plate 11, which forms a second heat dissipation duct between the top plate 11 and the top of the cooking cavity 20.

[0083] As a preferred example of this application, the cooking cavity 20 includes a cavity rear plate 21, such as... Figure 3 As shown, the drawer-type microwave oven also includes a partition 16, the two sides of which are respectively connected to the rear panel 21 and the rear side panel 14 of the cavity. Figure 3 As shown, the partition 16 cooperates with the heat dissipation fan assembly 31 to divide the rear area of ​​the cooking cavity 20 into a first cavity 30 and a second cavity 40. The heat dissipation fan assembly 31 is arranged on the upper part of the first cavity 30. The heat dissipation fan assembly 31 is used to drive outside air through the first air inlet structure 101 to enter the first cavity 30 and the second cavity 40 in sequence to form a first heat dissipation air duct.

[0084] This design allows forced airflow to pass through the partition 16 from the first cavity 30 into the second cavity 40, eliminating turbulence interference from traditional open air ducts and improving the heat dissipation efficiency of the magnetron 41 by 18-22%. At the same time, the isolation design of the first cavity 30 ensures that the operating temperature of the motor of the cooling fan assembly 31 is ≤45℃, significantly extending its service life. In addition, the partition 16 can effectively prevent the transmission of vibration of the cooling fan assembly 31 and prevent abnormal noise caused by resonance.

[0085] As a preferred example of this application, such as Figure 1 As shown, the cooking cavity 20 includes a cavity front plate 22, and the cavity front plate 22 has an exhaust port 221 on the side near the heat dissipation fan assembly 31. The airflow from the second cavity 40 and the exhaust port 221 form a second heat dissipation air duct. Figure 4 As shown, the drawer-type microwave oven also includes a lighting assembly 60 and a stirring motor 44, which are located within the second heat dissipation duct.

[0086] This configuration allows air from the first heat dissipation duct to flow out from the top of the second cavity 40 and pass over the top of the cooking cavity 20, before being discharged from the exhaust port 221 of the cavity front panel 22. This fully utilizes the airflow after the first heat dissipation duct has cooled down, reducing energy consumption while achieving heat dissipation for structures such as the lighting assembly 60 and the stirring motor 44 of the stirring device.

[0087] As a preferred example of this application, such as Figure 3 and Figure 5 As shown, a second air inlet structure 102 and an air guide 211 are provided in the second cavity 40. The second air inlet structure 102 is located on the bottom plate 15 and close to the partition plate 16. The air guide 211 is located on the side of the rear plate 21 of the cavity away from the heat dissipation fan assembly 31. A third heat dissipation air duct is formed between the second air inlet structure 102 and the air guide 211. The electronic control board 42 is disposed in the third heat dissipation air duct. A fourth heat dissipation air duct is formed between the air guide 211 and the exhaust port 221.

[0088] This setup uses a cooling fan assembly 31 to horizontally exhaust air to the upper part of the second cavity 40, thereby creating a negative pressure zone in the lower part of the second cavity 40. No additional fan is required. Outside air enters the second cavity 40 under negative pressure through the second air intake structure 102, which reduces energy consumption and dissipates heat from the electronic control board 42. Most of the air flows out from the top of the second cavity 40, while some air flows to the side of the cooking cavity 20 through the air guide 211, which reduces energy consumption and dissipates heat from components such as the drive motor 70 located on the side of the cooking cavity 20.

[0089] As a preferred example of this application, such as Figure 6 and Figure 9 As shown, a first air inlet 231 and a first air outlet 232 are provided on the side plate 27 of the cavity near the front plate 22 of the cavity. The first air inlet 231 and the first air outlet 232 are symmetrically arranged on the two side plates 27 of the cavity. The first air inlet 231 and the first air outlet 232 are both connected to the fourth heat dissipation air duct. A fan guide 25 is provided on the side of the cooking cavity 20. The fan guide 25 covers the first air outlet 232. The outlet end of the fan guide 25 is located near the exhaust port 221.

[0090] This design utilizes the air pressure of the fourth heat dissipation duct to draw some air into the cooking cavity 20 through the first air inlet 231 and exhaust it through the first air outlet 232 on the other side. This prevents oil droplets and water vapor generated during cooking from accumulating in the cooking cavity 20. Simultaneously, odors generated during cooking are expelled through the first air outlet 232 with the airflow, rather than lingering in the cooking cavity 20 for an extended period, thus reducing odor residue and improving the taste and quality of the cooked food. Furthermore, it does not significantly affect the heating and temperature rise within the cooking cavity 20. A single heat dissipation fan assembly 31 can simultaneously drive the airflow within the cooking cavity 20, resulting in low energy consumption.

[0091] As an example of the present invention, such as Figure 7 As shown, a horizontally placed mounting plate 17 is provided on the top of the first cavity 30. One side of the mounting plate 17 is connected to the right side plate 13 and the rear plate 21 of the cavity. A waveguide box 43 is provided on the top of the cooking cavity 20. The other side of the mounting plate 17 is fixedly connected to the waveguide box 43. There is a gap between the mounting plate 17 and the heat dissipation fan assembly 31.

[0092] This setup provides a fixed position for the waveguide box 43 and the magnetron 41 using the mounting plate 17, while forming a double-layer heat insulation structure with the cooling fan assembly 31 on the upper part of the first cavity 30 to prevent heat from the top of the cooking cavity 20 from being conducted downwards and to prevent affecting the operational stability of the frequency converter board. Specifically, the mounting plate 17, the right side plate 13, and the rear plate 21 of the cavity form a rigid triangular support structure, ensuring that the flatness error of the mounting surface of the waveguide box 43 is ≤0.05mm / m², thus ensuring the accuracy of the microwave emission direction.

[0093] As a preferred example of this application, such as Figure 8 As shown, the cavity side plate 27 includes:

[0094] Side plate body 274, the side plate body 274 is vertically disposed on both sides of the bottom wall 24 of the cooking cavity 20;

[0095] The air guide plate 275 is located above the side plate body 274 and is inclined towards the center of the cooking cavity 20. The air inlet is located on the air guide plate 275.

[0096] The design has the following advantages: First, the downward-sloping hot air from the inclined air guides 275 on both sides creates a counter-current vortex in the center of the cooking cavity 20, which helps to evenly distribute heat throughout the entire cooking cavity 20, making the temperature distribution more uniform and avoiding local overheating or undercooling, thus improving the cooking effect. Second, it enhances the heating intensity of the food, prioritizing the heating of the bottom of the food. The heat conduction through the metal baking pan accelerates the rise of the core temperature, significantly shortening the operation time of functions such as defrosting, improving thermal efficiency, and greatly reducing cooking time while improving the cooking effect. Third, the downward-sloping hot air from the inclined air guides 275 on both sides creates an air gap at the top of the cooking cavity 20, significantly reducing the upward conduction of heat and significantly reducing the heat dissipation difficulty of the electrical components at the top of the cooking cavity 20, eliminating the need for heat insulation structures at the top of the cooking cavity 20, and reducing costs. Fourth, it can reduce heat loss during the process of hot air entering the cooking cavity 20 to a certain extent, allowing more heat to be effectively applied to the food and improving energy utilization efficiency. V. The inclined air guide plate 275 can guide air more smoothly into the cooking cavity 20, reducing airflow resistance during the intake process; this helps improve the working efficiency of the hot air assembly 50, reduce energy consumption, and also ensure stable airflow. VI. The inclined setting of the air guide plate 275 increases the connection strength between the cavity side plate 27 and the cavity top wall 28, making the entire structure of the cooking cavity 20 more stable. VII. The inclined air guide plate 275 can disperse the stress at the connection between the cavity side plate 27 and the cavity top wall 28, avoiding damage caused by stress concentration, which helps extend the service life of the equipment and improve its reliability.

[0097] As a preferred example of this application, such as Figure 8 As shown, the air guide plate 275 is tilted at an angle α towards the center of the cooking cavity 20, where α is 25~65°.

[0098] The angle at which the air guide plate 275 is tilted toward the center of the cooking cavity 20 is within this range, which can form a relatively ideal counter-vortex in the center of the cooking cavity 20. The heat is evenly diffused in the cooking cavity 20, and the temperature distribution is also relatively uniform. This can achieve a good cooking effect while heating the food well and with a short heating time. In addition, a suitable air gap is formed at the top of the cooking cavity 20, making it easier for the electrical components at the top to dissipate heat.

[0099] As a preferred example of this application, such as Figure 8 As shown, the air guide plate 275 is tilted at an angle α of 45° towards the center of the cooking cavity 20.

[0100] The air guide plate 275 is tilted at an angle α of 45° towards the center of the cooking cavity 20, which can form the most ideal counter-vortex in the center of the cooking cavity 20. The heat is spread evenly in the cooking cavity 20, and the temperature distribution is also the best. It can achieve good cooking effect while heating the food with the best intensity and the shortest heating time. In addition, a suitable air gap is formed at the top of the cooking cavity 20, and the heat dissipation of the electrical components at the top is the easiest.

[0101] As a preferred example of this application, such as Figure 9 As shown, the first air inlet 231 and the first air outlet 232 are disposed on the air guide plate 275.

[0102] This structure can better guide air into the cooking chamber 20. When the wind pressure of the fourth heat dissipation duct is applied, the inclined air guide plate 275 can make the air enter the cooking chamber 20 more smoothly through the first air inlet 231, reduce the resistance of air flow, and improve the efficiency of air entering the cooking chamber 20. After the air flows in the cooking chamber 20, it is easier to converge at the first air outlet 232 along the inclined direction of the air guide plate 275, so as to smoothly discharge the cooking chamber 20 and form a good air circulation.

[0103] As a preferred example of this application, such as Figure 9 As shown, the ventilation area of ​​the first air inlet 231 is 1 / 8 to 1 / 6 of the ventilation area of ​​the first air inlet 271, and the ventilation area of ​​the first air outlet 232 is 1 / 8 to 1 / 6 of the ventilation area of ​​the second air inlet 272. In this embodiment, the ventilation area of ​​the first air inlet 231 is 1 / 7 of the ventilation area of ​​the first air inlet 271, and the ventilation area of ​​the first air outlet 232 is 1 / 7 of the ventilation area of ​​the second air inlet 272. This design ensures that the airflow entering and exiting the cooking chamber 20 through the first air inlet 231 and the first air outlet 232 in the fourth heat dissipation duct is relatively small. This ensures that there is a certain amount of airflow within the cooking chamber 20, which removes oil droplets, moisture, and odors, improving the taste and quality of the cooked food. At the same time, it does not significantly affect the heating and temperature rise within the cooking chamber 20, ensuring that the cooking equipment can heat according to the set temperature, improving the accuracy and stability of cooking. In addition, a single heat dissipation fan assembly 31 can simultaneously drive the airflow within the cooking chamber 20, resulting in low energy consumption.

[0104] As a preferred example of this application, such as Figure 10 and Figure 11 As shown, the hot air assembly 50 includes:

[0105] Circulation component 51, the circulation component 51 being located at the rear of the cooking cavity 20;

[0106] Heating components 52 are located on the side of the cooking cavity 20. The circulation component 51, heating components 52 and cooking cavity 20 are interconnected. There are two heating components 52 located on the left and right sides of the cooking cavity 20. The heating components 52 are arranged at the corresponding positions of the air inlet.

[0107] This setup uses the heating elements 52 on both sides to emit hot air downwards at an angle, which can form a counter-vortex in the center of the cooking cavity 20, making the temperature distribution more uniform. At the same time, it can prioritize heating the bottom of the food, and accelerate the core temperature rise through heat conduction through the metal baking pan, which can significantly shorten the running time of functions such as defrosting, resulting in better food cooking effect. In addition, the hot air emanating downwards on both sides can form an air gap at the top of the cooking cavity 20, which can significantly reduce the upward conduction of heat.

[0108] As a preferred example of this application, such as Figure 10 and Figure 11 As shown, the loop component 51 includes:

[0109] A circulating fan 511 is disposed on the rear side of the rear plate 21 of the cavity, and the circulating fan 511 is disposed at the corresponding position of the air outlet 273.

[0110] A fan cover 512 is installed on the rear plate 21 of the cavity, and a circulating fan 511 is installed inside the fan cover 512.

[0111] The circulating fan 511 is positioned corresponding to the air outlet 273, effectively guiding air out of the cooking cavity 20 to form a smooth airflow circulation. This layout conforms to the principles of airflow, reducing airflow resistance and improving the working efficiency of the circulating fan 511. The circulating fan 511 is installed inside the fan cover 512; the fan cover 512 not only protects the circulating fan 511 but also guides and rectifies the airflow, making it more evenly distributed in the cooking cavity 20 and improving heating uniformity. Air in the cooking cavity 20 is drawn into the fan cover 512 by the circulating fan 511, while air in the fan cover 512 is simultaneously blown into the cooking cavity 20, thus forming circulating air and ensuring uniform temperature within the cooking cavity 20.

[0112] As a preferred example of this application, such as Figure 10 As shown, a heat insulation frame 26 is provided on the outside of the fan cover 512, and a heat insulation component is provided between the fan cover 512 and the heat insulation frame 26.

[0113] This design effectively prevents heat from the cooking cavity 20 from being transferred to the outside of the fan cover 512, ensuring that the air temperature outside the fan cover 512 is low and that the heat dissipation of the components outside the fan cover 512 is good.

[0114] As a preferred example of this application, such as Figure 10 As shown, the heating assembly 52 includes:

[0115] Heating element 521, the heating element 521 is disposed on the outside of the air guide plate 275, and the heating element 521 is disposed at the corresponding position of the air inlet;

[0116] The mounting cover 522 is mounted on the air guide plate 275, and the heating element 521 is installed inside the mounting cover 522. The mounting cover 522 is connected to the fan cover 512 through the connecting port 55. This design makes the mounting cover 522 an important channel connecting the fan cover 512 and the air inlet structure of the cooking cavity 20, realizing effective air circulation inside and outside the cooking cavity 20.

[0117] In this way, the air in the cooking chamber 20 is drawn into the fan cover 512, and at the same time the circulating fan 511 blows the air into the mounting cover 522 where it is heated by the heating tube 521. Then the heated air is blown into the cooking chamber 20, thus forming circulating hot air, which makes the food heated more evenly and further enhances the cooking effect.

[0118] The heating element 521 is positioned corresponding to the air inlet. Firstly, by positioning the heating element 521 at the corresponding location in the air inlet, air entering the cooking cavity 20 from the air inlet is first heated by the heating element 521. This design preheats the air before it enters the cooking cavity 20, improving heating efficiency and preventing heat loss after heating, ensuring a rapid temperature rise within the cooking cavity 20. Secondly, the heating element 521 works in conjunction with the circulating fan 511 to form a hot air circulation system. The circulating fan 511 drives airflow, causing the heated air to circulate within the cooking cavity 20, further improving heating uniformity; uniform heating is achieved both on the surface and inside of the food, thus ensuring optimal cooking results.

[0119] As a preferred example of this application, such as Figure 10 As shown, a heat insulation frame 26 is provided on the outside of the mounting cover 522, and a heat insulation component is provided between the mounting cover 522 and the heat insulation frame 26.

[0120] This design effectively prevents heat from the cooking cavity 20 from being transferred to the outside of the mounting cover 522, ensuring that the air temperature outside the mounting cover 522 is low and that the heat dissipation of the components outside the mounting cover 522 is good.

[0121] As a preferred example of this application, the cavity bottom wall 24 and the two side plate bodies 274 form a U-shaped frame 23, and a heat insulation frame 26 is provided on the outside of the U-shaped frame 23, and the heat insulation element is provided between the heat insulation frame 26 and the U-shaped frame 23.

[0122] This design effectively prevents heat from being transferred from the cooking cavity 20 to the bottom and left and right sides, ensuring that the air temperature at the bottom and left and right sides of the cooking cavity 20 is low and that the heat dissipation of the components is good.

[0123] The drawer-type microwave oven also includes a drawer assembly 9 and a cabinet 100. The cabinet 100 includes a shell 10 and a cooking cavity 20. Both the shell 10 and the cooking cavity 20 are provided with openings corresponding to the drawer assembly 9. The drawer assembly 9 can be opened to cover the openings.

[0124] As a preferred example of this application, such as Figure 12 As shown, the drawer assembly 9 includes a door 91, which is capable of opening and closing the opening of the cooking cavity 20. The door 91 opens the opening of the cooking cavity 20 when the drawer assembly 9 is pulled out of the cooking cavity 20; the door 91 closes the opening of the cooking cavity 20 when the drawer assembly 9 is pushed into the cooking cavity 20.

[0125] As a preferred example of this application, the drawer assembly 9 further includes a placement portion 92 and a support portion 93. The placement portion 92 is capable of placing the heated object; the support portion 93 is capable of supporting the placement portion 92; and the lowest position of the air outlet portion 273 is lower than the lowest position of the support portion 93.

[0126] The lowest position of the air outlet 273 is lower than the lowest position of the support 93, which is good for the air outlet 273 to cooperate with the first air inlet 271 and the second air inlet 272 to form a "front-to-rear air intake" circulation path, forcing hot air to penetrate the food layer and forming a three-dimensional hot air circulation system. The three-dimensional hot air circulation system works in conjunction with microwave heating to achieve a three-dimensional heating effect, which greatly improves the heating uniformity and cooking effect. On the other hand, when the user pulls out the drawer assembly 9, there is no need to worry about hot air blowing directly onto the hand, reducing the risk of burns, improving user comfort, and ensuring high safety. In addition, the drawer assembly 9 will not shake due to hot air disturbance when it is fully pulled out, which improves the stability of the drawer assembly 9 when it is fully pulled out.

[0127] As a preferred example of this application, such as Figure 13 As shown, the air outlet 273 is located at the center of the rear plate 21 of the cavity.

[0128] This setup ensures that hot air diffuses evenly from the center of the cooking chamber 20 to the surrounding areas, reducing temperature gradients and improving the uniformity of hot air distribution, thereby enhancing the heating uniformity and cooking effect of food.

[0129] As a preferred example of this application, such as Figure 12As shown, the placement part 92 includes a drawer tray 921 and a cooking tray 922. The drawer tray 921 is disposed above the support part 93, and the cooking tray 922 is disposed above the drawer tray 921.

[0130] The support 93 provides solid support for the drawer tray 921, which in turn provides a stable platform for the cooking tray 922, making the entire holding section 92 less prone to shaking or tilting when placing items or during the pulling out process. The drawer tray 921 and the cooking tray 922 are independent components, which can be easily cleaned by the user to keep the holding section 92 clean and hygienic.

[0131] As a preferred example of this application, such as Figure 12 As shown, the cooking tray 922 includes a first tray 9221 and a second tray 9222. The first tray 9221 is disposed above the drawer tray 921, and the second tray 9222 is disposed above the first tray 9221. A through hole 9223 is provided at the bottom of the second tray 9222. Figure 8 As shown, a steam flow space 90 is formed between the second tray 9222 and the first tray 9221.

[0132] The design of the through-hole 9223 and the steam flow space 90 allows hot air or steam to flow freely below and above the second tray 9222, forming a more uniform heat circulation, making the food heat more evenly and improving heat transfer efficiency. On the other hand, it allows excess oil or water to drip off naturally, preventing the food from soaking in liquid, making the food surface crispier, the taste better, and the cooking effect excellent. At the same time, excess oil or water is collected in the first tray 9221 for easy cleaning.

[0133] The drawer-type microwave oven also includes a guide rail assembly 80 and a control box 300. Their specific structures and assembly relationships are existing technologies and will not be described in detail here.

[0134] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A drawer-type microwave oven characterized by comprising: The drawer-type microwave oven comprises: a housing (10); a heat-insulated cavity assembly arranged inside the housing (10), the heat-insulated cavity assembly comprising a cooking cavity (20) and a heat-insulated frame (26) with heat insulation arranged between the cooking cavity (20) and the heat-insulated frame (26); a hot air assembly (50) for forming circulating air in the cooking cavity (20), the heat-insulated frame (26) covering the hot air assembly (50), and the heat-insulated frame (26) also at least partially covering the cooking cavity (20); a heat dissipation fan assembly (31) arranged between the housing (10) and the heat-insulated cavity assembly; a magnetron (41) for emitting microwaves into the cooking cavity (20), the magnetron (41) being arranged at an outlet of the heat dissipation fan assembly (31); an air inlet portion and an air outlet portion (273) are arranged on the cooking cavity (20), the hot air assembly (50) communicating with the cooking cavity (20) through the air inlet portion and the air outlet portion (273), the cooking cavity (20) comprising a cavity back plate (21) and two oppositely arranged cavity side plates (27), the air inlet portion comprising a first air inlet (271) and a second air inlet (272), the first air inlet (271) and the second air inlet (272) being symmetrically arranged on the two cavity side plates (27), and the air outlet portion (273) being arranged on the cavity back plate (21); the drawer-type microwave oven further comprises a partition plate (16) cooperating with the heat dissipation fan assembly (31) and separating a rear area of the cooking cavity (20) into a first cavity (30) and a second cavity (40).

2. The drawer-type microwave oven according to claim 1, wherein The housing (10) comprises a rear side plate (14) and a bottom plate (15) connected together, a first air inlet structure (101) is arranged on the rear side plate (14) and / or the bottom plate (15), and a frequency conversion plate is arranged between the first air inlet structure (101) and an outlet end of the fan assembly (31).

3. The drawer-type microwave oven according to claim 2, wherein Two sides of the partition plate (16) are connected with the cavity back plate (21) and the rear side plate (14) respectively, the heat dissipation fan assembly (31) is arranged at an upper portion of the first cavity (30), and the heat dissipation fan assembly (31) is used to drive external air to sequentially enter the first cavity (30) and the second cavity (40) through the first air inlet structure (101) to form a first heat dissipation air duct.

4. The drawer-type microwave oven according to claim 3, wherein The cooking cavity (20) comprises a cavity front plate (22), an air outlet (221) is arranged on a side of the cavity front plate (22) close to the heat dissipation fan assembly (31), a second heat dissipation air duct is formed between air outflows of the second cavity (40) and the air outlet (221), and the drawer-type microwave oven further comprises an illumination assembly (60) and a stirring motor (44), the illumination assembly (60) and the stirring motor (44) of a stirring device being located in the second heat dissipation air duct.

5. The drawer-type microwave oven according to claim 4, wherein A second air inlet structure (102) is arranged in the second cavity (40), and the second air inlet structure (102) is arranged on the bottom plate (15) and close to the partition plate (16); an air guide opening (211) is arranged on the cavity rear plate (21) away from the heat dissipation fan assembly (31); a third heat dissipation air duct is formed between the second air inlet structure (102) and the air guide opening (211); and an electric control board (42) is arranged in the third heat dissipation air duct; and a fourth heat dissipation air duct is formed between the air guide opening (211) and the air outlet (221).

6. The drawer-type microwave oven according to claim 5, wherein A first air inlet (231) and a first air outlet (232) are arranged on the cavity side plate (27) close to one end of the cavity front plate (22); the first air inlet (231) and the first air outlet (232) are symmetrically arranged on the two cavity side plates (27); the first air inlet (231) and the first air outlet (232) are connected with the fourth heat dissipation air duct; a wind guide (25) is arranged on the side of the cooking cavity (20); the wind guide (25) covers the first air outlet (232); and an outlet end of the wind guide (25) is arranged close to the air outlet (221).

7. The drawer-type microwave oven according to claim 3, wherein A mounting plate (17) horizontally arranged is arranged on the top of the first cavity (30); one side of the mounting plate (17) is connected with the right side plate (13) and the cavity rear plate (21); a waveguide box (43) is arranged on the top of the cooking cavity (20); the other side of the mounting plate (17) is fixedly connected with the waveguide box (43); and a gap is formed between the mounting plate (17) and the heat dissipation fan assembly (31).

8. The drawer-type microwave oven according to claim 1, wherein The cavity side plate (27) comprises: a side plate body (274) vertically arranged on both sides of a cavity bottom wall (24) of the cooking cavity (20); an air guide plate (275) obliquely arranged above the side plate body (274) and close to the center of the cooking cavity (20); and 9. The drawer-type microwave oven according to claim 8, wherein an air inlet portion arranged on the air guide plate (275).

10. The drawer-type microwave oven according to claim 1, wherein An angle of the air guide plate (275) obliquely arranged close to the center of the cooking cavity (20) is α, and α is 25-65°.

11. The drawer-type microwave oven as claimed in claim 8, wherein A height of the air outlet portion (273) is lower than that of the air inlet portion. The hot air assembly (50) comprises: a circulation assembly (51) arranged at the rear of the cooking cavity (20); 12. The drawer-type microwave oven according to claim 11, wherein two heating assemblies (52) respectively arranged at the left and right sides of the cooking cavity (20); the circulation assembly (51), the heating assemblies (52) and the cooking cavity (20) are in communication with each other; and the heating assemblies (52) are arranged at corresponding positions of the air inlet portion. The circulation assembly (51) comprises: A circulating fan (511) is arranged at the back side of the cavity back plate (21), and is arranged at the corresponding position of the air outlet hole portion (273); A fan cover (512) is mounted on the cavity back plate (21), and the circulating fan (511) is mounted inside the fan cover (512).

13. The drawer-type microwave oven according to claim 12, wherein The heating assembly (52) comprises: A heating tube (521) is arranged at the outer side of the air deflector (275), and is arranged at the corresponding position of the air inlet hole portion; A mounting cover (522) is mounted on the air deflector (275), and the heating tube (521) is mounted inside the mounting cover (522), and the mounting cover (522) is communicated with the fan cover (512) through a communication port (55).

14. The drawer-type microwave oven according to claim 1, wherein The drawer-type microwave oven further comprises a drawer assembly (9) and a cabinet (100), the cabinet (100) comprises a shell (10) and a cooking cavity (20), the shell (10) and the cooking cavity (20) are both provided with a port corresponding to the drawer assembly (9), and the drawer assembly (9) is openably covered on the port.

15. The drawer-type microwave oven according to claim 14, wherein The drawer assembly (9) comprises a placing portion (92) and a supporting portion (93), the placing portion (92) can place a heated object, the supporting portion (93) can support the placing portion (92), and the lowest position of the air outlet hole portion (273) is lower than the lowest position of the supporting portion (93).

Images