Drainage structure and microwave oven

Abstract

The utility model provides a drainage structure and a microwave oven, the drainage structure is arranged in a heating cavity, the heating cavity comprises a horizontally arranged cavity bottom plate, the cavity bottom plate is provided with a first annular concave part and a second annular concave part, the first concave part is located on the peripheral side of the second concave part, and the first concave part and the second concave part are concentrically arranged; and the first sunken part and / or the second sunken part are / is provided with a drainage assembly. According to the utility model, the structure of the bottom plate of the cavity is optimized to realize echelon drainage, and a user can conveniently clean the interior of the heating cavity; the bottom plate of the cavity can be reinforced, and the situation that the bottom plate is bent and deformed under the action of external force is prevented; the second concave part of the cavity bottom plate can be used for placing the roller assembly, so that the mounting height of the glass turntable is reduced and the effective volume of the heating cavity is increased.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically, to a drainage structure and a microwave oven. Background Technology

[0002] Microwave ovens use high-frequency microwaves emitted by a magnetron to act on water molecules in food. The heat generated by the high-speed movement and friction of the water molecules is used to quickly heat the food, making it an indispensable cooking appliance.

[0003] Microwave ovens generate steam when heating food, which condenses on the side walls of the cavity and eventually falls to the bottom. To prevent accidental spillage and excessive condensation that could damage the turntable motor, a drain hole is typically provided at the bottom of the cavity. For example, Chinese Patent Application No. 200920138842.8 discloses a microwave oven with a drainage mechanism. This involves a drain hole within a cavity groove, where a turntable drives a turntable support, and rollers on the support carry the accumulated water from the groove to the drain hole. However, this design also results in excessive condensation being directly drained through the drain hole, which, while avoiding safety issues, makes cleaning the bottom of the microwave oven difficult and creates unsanitary areas, especially when the microwave is embedded in a kitchen.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The problem solved by this invention is that the structure of existing microwave ovens is unreasonable, which makes it impossible to balance the convenience of cleaning and the safety of use.

[0006] To solve the above problems, this utility model provides a microwave oven, including a heating cavity. The heating cavity includes a U-shaped main body, and the main body includes a horizontally arranged cavity bottom plate. The cavity bottom plate is provided with a first recess and a second recess in an annular shape. The first recess is located on the outer periphery of the second recess and the two are concentrically arranged. The first recess and / or the second recess are provided with a drainage component.

[0007] This design prevents condensate from flowing out under normal circumstances, but drains water through the drainage component in the second recess in case of accidental spills, ensuring safety. It also strengthens the bottom plate of the cavity to prevent bending or deformation under external forces. The second recess can be used to house the roller assembly, reducing the installation height of the glass turntable and increasing the effective volume of the heating cavity. At the same time, the glass turntable can shield the drainage component, making the interior of the heating cavity more concise and aesthetically pleasing.

[0008] Preferably, the first recess and the second recess are formed by the downward recess of the cavity bottom plate, and the bottom surfaces of the first recess and the second recess are at the same height and their projected areas on the horizontal plane are S1 and S2, respectively, wherein S1 < S2.

[0009] This design allows the first recess to hold more condensate than the second recess. The first recess can fully accommodate the small amount of condensate generated during normal use, preventing condensate from entering the second recess or flowing out of the microwave oven. In the event of an accident such as a container tipping over, some water or other liquids will enter the second recess and be drained through the drainage assembly, effectively preventing motor malfunctions or even safety accidents caused by water seepage.

[0010] Preferably, a motor mounting portion is provided on the bottom plate of the cavity, the motor mounting portion being located within the second recess, and the motor mounting portion partially protruding upward to form a support platform, the support platform being concentrically arranged with the second recess. This arrangement can further increase the height of the motor shaft assembly, improve waterproofing, and provide installation space for motor assembly, resulting in a more compact structure.

[0011] Preferably, the drainage component is a drainage hole, and an annular rib is provided on the bottom outer edge of the drainage hole. The annular rib extends downward and protrudes from the bottom plate of the cavity. This design can prevent water flowing out of the drainage hole from flowing freely along the bottom surface of the cavity bottom plate and entering the electrical cavity, thus avoiding safety hazards.

[0012] Preferably, the heating cavity includes a U-shaped main body, which further includes a vertically arranged first side plate and a second side plate. The first side plate and the second side plate are located on both sides of the cavity bottom plate, and a portion of the first side plate protrudes to the side away from the second side plate to form a third protrusion. This arrangement can further increase the volume of the heating cavity and reduce microwave leakage at the retrieval port; at the same time, it strengthens the main body and prevents it from bending and deforming.

[0013] Preferably, the microwave oven further includes a glass turntable, with a connector at its bottom. The lower part of the connector passes through the support platform and connects to a motor drive to drive the glass turntable to rotate. The microwave oven also includes a roller assembly, which is disposed in the second recess and located on the outer periphery of the connector, for supporting the glass turntable. This arrangement, utilizing the support platform, increases the mechanical strength of the cavity bottom plate while providing installation space for the motor, ensuring a small overall footprint and a more compact structure for the drive unit.

[0014] Preferably, the first recess is provided with a drainage component. The drainage component may be one or more, evenly distributed along the outer periphery of the first recess. This arrangement further improves the waterproof performance of the microwave oven, preventing electrical malfunctions.

[0015] Preferably, the heating chamber further includes:

[0016] A top plate is provided at the top opening of the main body, and the minimum height difference between the top plate and the bottom plate of the cavity is H2;

[0017] The cavity rear plate has one side connected to the top plate, and the remaining sides of the cavity rear plate are connected to the main body.

[0018] The cavity front plate is disposed opposite to the cavity rear plate and connected to the main body and the top plate. The cavity front plate 11 is provided with an object retrieval port. The width and height of the object retrieval port are L1 and H1, respectively. The width of the main body is L2, where L1 < L2 and H1 < H2.

[0019] This application improves the structure of the cavity front panel, which can effectively reduce microwave leakage and ensure greater user safety.

[0020] Preferably, the retrieval port is provided with a reinforcing structure, which is formed by bending the front plate of the cavity towards the main body at a 150°-180° angle. A gap exists between the free end of the reinforcing structure and the adjacent main body or top plate. This arrangement not only strengthens the retrieval port 111 but also creates a groove structure between the free end of the reinforcing structure and the main body or top plate, effectively reducing microwave leakage from the edge of the retrieval port.

[0021] Preferably, the microwave oven has a capacity of 12-17L. This microwave oven is suitable for daily use by single individuals and families of 1-2 people, and can also meet the need to cook meals for multiple people simultaneously under certain circumstances, making it widely applicable. Preferably, the microwave oven has a capacity of 12-16L or 13-15L.

[0022] Compared with the prior art, the microwave oven described in this utility model embodiment has the following beneficial effects: 1) By optimizing the structure of the cavity bottom plate, not only can tiered drainage be achieved, but it also facilitates users to clean the inside of the heating cavity; 2) The cavity bottom plate can be strengthened to prevent bending and deformation under external force; 3) The second recess of the cavity bottom plate can be used to place the roller assembly, reduce the installation height of the glass turntable and increase the effective volume of the heating cavity; the glass turntable can be used to cover the drainage assembly, making the heating cavity more concise and beautiful. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the microwave oven described in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the heating cavity of the microwave oven described in Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the main body described in Embodiment 1 of this utility model;

[0026] Figure 4 This is a front view of the main body described in Embodiment 1 of this utility model;

[0027] Figure 5 This is a partial explosion diagram of the microwave oven described in Embodiment 1 of this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the cavity front plate according to Embodiment 2 of this utility model;

[0029] Figure 7 This is a front view of the heating cavity of the microwave oven described in Embodiment 2 of this utility model;

[0030] Figure 8 for Figure 7 A schematic cross-sectional view along the AA side of the middle section;

[0031] Figure 9 for Figure 7 A cross-sectional view along the BB side.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Heating chamber; 11-Cavity front plate; 111-Retrieval port; 112-Reinforcing structure; 113-Avoidance structure; 1131-First avoidance groove; 1132-Second avoidance groove; 12-Cavity rear plate; 121-First protrusion; 122-Second protrusion; 123-First avoidance part; 13-Top plate; 14-Main body; 141-First side plate; 1411-Third protrusion; 142-Second side plate; 143-Cavity bottom plate; 1431-First groove; 1432-Second groove; 1433-Drainage assembly; 1434-Support platform; 2-Door assembly; 21-Second avoidance part; 3-Shell; 31-Shell bottom plate; 4-Control panel; 5-Roller assembly; 6-Glass turntable; 7-Connector; 8-Motor. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Without conflict, the technical features of the embodiments of this utility model can be combined with each other.

[0035] It should be noted that all directional and positional terms used in this utility model, 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 this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model 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.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] 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 present 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.

[0038] With the growing number of single people, microwave ovens are increasingly favored by consumers due to their small footprint. This necessitates not only a more compact structure but also an increase in the cooking cavity's capacity to improve practicality. Existing microwave ovens have an unreasonable structure, making it difficult to balance ease of cleaning and safety when integrated into multi-functional spaces. Therefore, the applicant proposes the following technical solution: Example 1

[0039] like Figure 1-5As shown, a microwave oven includes a heating cavity 1. The heating cavity 1 includes a U-shaped main body 14. The main body 14 includes a horizontally arranged cavity bottom plate 143. The cavity bottom plate 143 is provided with an annular first recess 1431 and a second recess 1432. The first recess 1431 is located on the outer periphery of the second recess 1432 and the two are concentrically arranged. The first recess 1431 and / or the second recess 1432 are provided with a drainage assembly 1433.

[0040] The microwave oven produces relatively little condensate during normal use, which collects in the first recess 1431, making it easy for users to clean after use without spilling onto the countertop. However, when a container is tipped over, causing a large amount of water to flow onto the cavity bottom plate 243, some of the water drains from the first recess 1431 to the second recess 1432 and out through the drain assembly 1433. This effectively prevents condensate from seeping into the motor 8 along the motor shaft, thus avoiding electrical safety hazards. Simultaneously, the first and second recesses 1431 and 1432 reinforce the cavity bottom plate 143, preventing bending or deformation under external forces. Furthermore, the second recess 1432 is used to house the roller assembly 5, increasing the effective volume of the heating cavity 1. The glass turntable 6 placed on the roller bracket 5 also conceals the drain assembly 1433, making the heating cavity 1 more streamlined and aesthetically pleasing.

[0041] Preferably, the first recessed portion 1431 and the second recessed portion 1432 are respectively formed by the downward recess of the cavity bottom plate 143. The first recessed portion 1431 and the second recessed portion 1432 are at the same height and their projected areas on the horizontal plane are S1 and S2, respectively, wherein S1 < S2.

[0042] This design allows the first recess 1431 to hold more condensate than the second recess 1432. The first recess 1431 can fully accommodate the small amount of condensate generated during normal use, preventing the condensate from entering the second recess 1432 or flowing out of the microwave oven. In the event of an accident such as a container tipping over, some water or other liquids will enter the second recess 1432 and drain out through the drainage assembly 1433, effectively preventing malfunctions or even safety accidents caused by water seepage. At the same time, the lower surface of the cavity bottom plate 143 is not flat, preventing water from flowing freely along the lower surface of the cavity bottom plate 143, making it easier to clean the installation location of the microwave oven.

[0043] As an example of this utility model, a motor mounting portion is provided on the cavity bottom plate 143. The motor mounting portion is located within the second recessed portion 1432, and the motor mounting portion partially protrudes upward to form a support platform 1434 for assembling the connector 7. The support platform 1434 and the second recessed portion 1432 are concentrically arranged. This arrangement can further increase the mounting height of the motor shaft of the motor 8, improve the waterproof effect, and provide installation space for the assembly of the motor 8, resulting in a more compact structure.

[0044] As an example of this utility model, the drainage component 1433 is a drainage hole, and an annular rib is provided on the bottom outer edge of the drainage hole, the annular rib protruding from the bottom plate 143 of the cavity. This arrangement can prevent water flowing out of the drainage hole from flowing freely along the bottom surface of the bottom plate 143 of the cavity and entering the electrical cavity, thus preventing safety hazards.

[0045] As an example of this utility model, the main body 14 further includes a vertically arranged first side plate 141 and a second side plate 142, which are located on both sides of the cavity bottom plate 143. A portion of the first side plate 141 protrudes to the side away from the second side plate 142 to form a third protrusion 1411. This arrangement can further increase the volume of the heating cavity 1 and reduce microwave leakage at the retrieval port 111; at the same time, it strengthens the main body 14 and prevents it from bending and deforming.

[0046] As an example of this utility model, the microwave oven further includes a connector 7, a roller assembly 5, and a glass turntable 6. The roller assembly is located between the cavity bottom plate 143 and the glass turntable 6. The upper part of the connector 7 is fitted with the glass turntable 6 for limiting, and the lower part of the connector 7 passes through the support platform 1434 and is connected to the motor 8 for driving the glass turntable 6 to rotate. This arrangement utilizes the support platform to increase the mechanical strength of the cavity bottom plate 143, while providing installation space for the motor 8, ensuring that the overall space occupied by the drive device is small and the structure is more compact.

[0047] Preferably, the microwave oven further includes a housing 3, which includes a housing bottom plate 31. The housing bottom plate 31 has through holes at positions corresponding to the motor 8. This arrangement allows for heat dissipation from the motor 8 and also allows condensate to drain from the housing bottom plate 31. Example 2

[0048] Existing microwave ovens effectively prevent microwave leakage through their door structure design. However, smaller microwave ovens experience more significant microwave leakage due to size variations. Therefore, the applicant has made the following improvements to Example 1:

[0049] like Figure 6-9 As shown, the heating chamber 1 further includes:

[0050] A top plate 13 is provided to cover the top opening of the U-shaped structure, and the minimum height difference between the top plate 13 and the bottom of the main body 14 is H2;

[0051] The cavity rear plate 12 has one side connected to the top plate 13, and the other sides of the cavity rear plate 12 are connected to the main body 14.

[0052] The cavity front plate 11 is disposed opposite to the cavity rear plate 12 and connected to the main body 14 and the top plate 13. The cavity front plate 11 is provided with an object retrieval port 111, the width and height of the object retrieval port 111 are L1 and H1 respectively, and the width of the main body 14 is L2, wherein L1 < L2 and H1 < H2.

[0053] For microwave ovens, the size of the food retrieval opening 111 is usually consistent with the heating cavity 1, which not only facilitates the handling of food but also eliminates blind spots, making it easy to clean the inside of the microwave oven. Reducing the size of the food retrieval opening 111 is generally considered to be detrimental to the handling of food, which is especially true for microwave ovens and would further reduce their practicality. However, this application has found through research that although the existing structure can meet the leakage test standards for microwave ovens, the leakage value is relatively high. By reducing the size of the food retrieval opening 111, the microwave leakage value can be significantly reduced, making it safer for users.

[0054] As an example of this utility model, the retrieval port 111 is provided with a reinforcing structure 112. The reinforcing structure 112 is formed by bending a portion of the cavity front plate 11 towards the side closer to the main body 14 by 150°-180°. There is a gap between the free end of the reinforcing structure 112 and the main body 14 or the top plate 13. This arrangement not only strengthens the retrieval port 111, but also creates a gap between the free end of the reinforcing structure 112 and the main body 14 or the top plate 13, forming a groove structure, which effectively reduces microwave leakage from the edge of the retrieval port 111.

[0055] As an example of this utility model, the reinforcing structure 112 is located on the side of the cavity front plate 11 near the main body 14, and the reinforcing structure 112 is arranged parallel to the cavity front plate 11. This arrangement allows the reinforcing structure 112 to cooperate with the cavity front plate 11 to form a choke groove structure similar to a door assembly. When microwaves reach the vicinity of the retrieval port 111, they encounter reverse reflected waves, and the two cancel each other out, thus presenting a high impedance to effectively block microwaves in the heating cavity 1 from escaping from the retrieval port 111.

[0056] Preferably, the minimum distance between the free end of the reinforcing structure 112 and the main body 14 or the top plate 13 is 2-10 mm, and the minimum distance between the reinforcing structure 112 and the cavity front plate 11 is 0.5-2 mm. The reinforcing structure 112 is formed by bending a portion of the cavity front plate 11 180° towards the side closer to the main body 14. This arrangement utilizes the short-circuit and open-circuit characteristics to effectively confine microwave energy within the heating cavity 1, resulting in low microwave leakage and high energy utilization.

[0057] As an example of this utility model, the front plate 11 of the cavity is partially recessed to form a clearance structure 113, which is located on the lower side of the retrieval port 111. This design can reduce the inconvenience caused by the reduction in the size of the retrieval port 111, allowing the food container to be smoothly placed into the heating cavity 1, facilitating retrieval and placement operations.

[0058] Preferably, the clearance structure 113 includes a first clearance groove 1131 and a second clearance groove 1132 extending vertically. The first clearance groove 1131 and the second clearance groove 1132 are located on both sides of the retrieval opening 111 and are at the same height. This arrangement can increase the maximum width of the retrieval opening 111, allowing containers such as plates to smoothly enter the heating chamber 1 through the clearance structure 113 during use. If the container such as the plate is too large, it can also smoothly enter through the clearance structure 113 after being tilted to one side, thus increasing its versatility.

[0059] As an example of this utility model, a portion of the rear plate 12 of the cavity protrudes away from the front plate 11 of the cavity to form a first protrusion 121, and a portion of the first protrusion 121 protrudes away from the front plate 11 of the cavity to form a second protrusion 122. This arrangement not only further increases the volume of the heating cavity 1, allowing containers such as bowls of a certain height to be placed inside the heating cavity 1, but also causes the rear plate 12 of the cavity to partially protrude rearward. When the microwave oven is embedded in the kitchen space, the second protrusion 122 abuts against the rear wall of the kitchen space for limitation, ensuring that the fan assembly inside the electrical cavity is at a certain distance from the rear wall of the kitchen space, resulting in low operating resistance and good heat dissipation.

[0060] Preferably, a first clearance portion 123 is provided at the lower part of the rear plate 12 of the cavity. The first clearance portion 123 is set lower than the clearance structure 113. A turntable assembly is provided inside the heating cavity 1. The projection of the first clearance portion 123 on the horizontal plane is a first arc, and the circle containing the first arc is concentric with the circle containing the turntable assembly. This arrangement allows the bottom of the rear plate 12 of the cavity to be cleared, facilitating the placement of containers such as discs into the heating cavity 1.

[0061] As an example of this utility model, the microwave oven further includes a door assembly 2 for blocking the food retrieval opening 111; a second clearance portion 21 is provided at the lower part of the door assembly 2, and the projection of the second clearance portion 21 on the horizontal plane is a second arc, the second arc being located on the circle containing the first arc. This arrangement allows the door assembly 2 to avoid containers such as plates, further increasing the practicality of the microwave oven; it not only meets the daily cooking needs of common three-person households or single people, but also, due to the first clearance portion 123 provided in the cavity rear plate 12 and the second clearance portion 21 provided in the door assembly 2, it can also meet the needs of placing larger plates or other containers in certain situations, making it highly practical.

[0062] The microwave oven of this utility model also includes a housing 3 and a control panel 4. The control panel 4 is located on the side of the door assembly 2 near the electrical cavity. The heating cavity 1 is disposed inside the housing 3. The specific structure and assembly relationship of the housing 3 and the control panel 4 are existing technologies and will not be described in detail here.

[0063] 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 present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A microwave oven comprising a heating cavity (1) including a horizontally disposed cavity floor (143), characterized in that, The cavity bottom plate (143) is provided with a first annular recess (1431) and a second recess (1432), the first recess (1431) is located at the outer circumferential side of the second recess (1432) and is concentrically arranged with the second recess (1432), and the first recess (1431) and / or the second recess (1432) is / are provided with a drainage assembly (1433).

2. The microwave oven as claimed in claim 1, wherein The first recess (1431) and the second recess (1432) are respectively formed by part of the cavity bottom plate (143) being downwardly recessed, the bottom surfaces of the first recess (1431) and the second recess (1432) are at the same height, and the projection areas of the first recess (1431) and the second recess (1432) on a horizontal plane are respectively S1 and S2, wherein S1 < S2.

3. The microwave oven as claimed in claim 1, wherein The cavity bottom plate (143) is provided with a motor mounting portion, the motor mounting portion is located in the second recess (1432), the motor mounting portion is partially upwardly protruding to form a support table (1434), and the support table (1434) is concentrically arranged with the second recess (1432).

4. The microwave oven as claimed in claim 1, wherein The drainage assembly (1433) is a drainage hole, an annular protruding rib is arranged at the outer edge of the bottom of the drainage hole, the annular protruding rib extends downwardly and protrudes from the cavity bottom plate (143).

5. The microwave oven as claimed in claim 1, wherein The heating cavity (1) comprises a main body (14) in a U-shaped structure, the main body (14) further comprises a first side plate (141) and a second side plate (142) arranged vertically, the first side plate (141) and the second side plate (142) are located at the two sides of the cavity bottom plate (143), and the first side plate (141) partially protrudes away from the second side plate (142) to form a third protruding portion (1411).

6. The microwave oven as claimed in claim 1, wherein The microwave oven further comprises a glass turntable (6), a connector (7) is arranged at the bottom of the glass turntable (6), the lower part of the connector (7) is drivingly connected with a motor (8) after penetrating through the support table (1434) to drive the glass turntable (6) to rotate, and the microwave oven further comprises a roller assembly (5) which is limitingly installed in the second recess (1432) and located at the outer circumferential side of the connector (7) to support the glass turntable (6).

7. The microwave oven as claimed in claim 5, wherein The heating cavity (1) further comprises: a top plate (13) which is arranged at the top opening of the main body (14), the minimum height difference between the top plate (13) and the cavity bottom plate (143) is H2; a cavity back plate (12) which is connected with the top plate (13) at one side edge and connected with the main body (14) at the remaining side edges; a cavity front plate (11) which is arranged opposite to the cavity back plate (12) and connected with the main body (14) and the top plate (13), and the cavity front plate (11) is provided with a taking opening (111), the width and the height of the taking opening (111) are respectively L1 and H1, and the width of the main body (14) is L2, wherein L1 < L2 and H1 < H2.

8. The microwave oven as claimed in claim 7, wherein The four periphery edges of the taking-out port (111) are respectively provided with reinforcing structures (112) which are formed by bending 150°-180° of the cavity front plate (11) towards the side close to the main body (14), and there is a gap between the free end of the reinforcing structure (112) and the adjacent main body (14) or top plate (13).

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