A heating pot for microwave oven and oven
Patent Information
- Application Number
- CN202521445961.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-07-10
AI Technical Summary
[0003]现有的一些微波炉加热盒等餐具,包括金属锅体,加热时微波会被金属阻挡,无法穿透金属对金属锅体内的食物进行有效加热,导致食物加热效果不佳
[0014]相对于现有技术,本实用新型中的微波炉和烤箱通用的加热锅,设置有发热复合层,发热复合层的涂层、第一微波吸收发热片及第二微波吸收发热片均能够吸收微波进行发热,从而对金属锅体内的食物进行加热,食物升温速度快,且本加热盒也适用于烤箱加热,使用范围广;磨压工艺连接的第一微波吸收发热片和第二微波吸发热片结合更加紧密,避免两者发生脱开损坏的问题,同时磨压工艺具有较好的耐高温性,在高温下也不易脱开,使用寿命长;发热复合层的下侧设置有若干个支撑凸块,使得微波加热后产生的热量更直接地传导到金属锅体底部,可以增强热传导效果,使得金属锅体整体更快地升温,从而更有效地加热食物;由于支撑凸块的设计,发热复合层与微波炉/烤箱之间形成了空隙,有助于空气流通,提高加热的效率和均匀性;本微波炉和烤箱通用的加热锅具有三种组合状态,使用更加灵活。
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Figure CN224655123U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heatable tableware technology, and more specifically, to a heating pot that can be used in both microwave ovens and ovens. Background Technology
[0002] A microwave oven is a modern cooking appliance that uses microwaves to heat food. It consists of a power supply, a magnetron, a control circuit, and a cooking cavity. The power supply provides approximately 4000 volts of high voltage to the magnetron. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are then coupled into the cooking cavity through a waveguide system. During heating, the generated microwave energy is evenly distributed within the cooking cavity, thereby heating the food.
[0003] Some existing microwave-safe containers and other tableware, including metal pots, have microwaves that are blocked by the metal during heating, preventing them from penetrating the metal to effectively heat the food inside, resulting in poor heating performance. Utility Model Content
[0004] To address at least one of the aforementioned problems, this utility model provides a microwave oven and oven-compatible heating pot, comprising a metal pot body. A heating composite layer is exposed on the outer side of the metal pot body. The heating composite layer includes a coating, a first microwave-absorbing heating element, and a second microwave-absorbing heating element. The coating is applied to the bottom of the metal pot body. The first microwave-absorbing heating element is located on the side of the coating away from the metal pot body, and the second microwave-absorbing heating element is located on the side of the first microwave-absorbing heating element away from the coating. All three elements—the coating, the first microwave-absorbing heating element, and the second microwave-absorbing heating element—can absorb microwaves and generate heat. During microwave heating, the coating, the first microwave-absorbing heating element, and the second microwave-absorbing heating element absorb microwaves and generate heat, which is then conducted to the metal pot body to heat the food inside. This microwave oven and oven-compatible heating pot features a heating composite layer, and the coating, the first microwave-absorbing heating element, and the second microwave-absorbing heating element of the heating composite layer can all absorb microwaves and generate heat, thereby heating the food inside the metal pot. The food heats up quickly, and this heating pot is also suitable for oven heating, making it widely applicable.
[0005] Optionally, the heating composite layer is disposed on the lower side of the metal pot body, the coating is a microwave absorbing coating, and both the first microwave absorbing heating element and the second microwave absorbing heating element are made of silicone; the microwave absorption generates instantaneous heating, and the melting point of the first microwave absorbing heating element and the second microwave absorbing heating element is 230℃-250℃.
[0006] Optionally, the first microwave absorbing heating element and the second microwave absorbing heating element are connected by a grinding and pressing process.
[0007] Optionally, the first microwave absorbing heating element is bonded to the coating.
[0008] Optionally, the inner surface of the metal pot is coated with a non-stick coating, which is a Teflon coating or a ceramic coating.
[0009] Optionally, a plurality of support protrusions are provided on the lower side of the heating composite layer.
[0010] Optionally, the inner bottom of the metal pot body is provided with a plurality of protruding strips.
[0011] Optionally, the metal pot body is provided with an annular ring, the annular ring is provided with a water pouring groove and a side handle, the annular ring and the side handle are both made of non-stick silicone material, the non-stick silicone is nano-hydrophobic coated silicone or antistatic modified silicone.
[0012] Optionally, the microwave oven and oven-compatible heating pot also includes a lid, which is detachably mounted on the upper part of the metal pot body. The lower side of the lid is provided with a positioning rib, and the annular ring is provided with a first positioning groove. When the lid is placed on the upper side of the annular ring, the positioning rib is positioned in the first positioning groove.
[0013] Optionally, the microwave oven and oven universal heating pot further includes an intermediate box body, which includes a metal plate and an annular support connected to the upper part of the metal plate. Two heating composite layers are provided, one located at the bottom of the outer surface of the metal pot body and the other at the bottom of the outer surface of the metal plate. A first abutment portion is provided on the lower side of the annular support, and a second abutment portion corresponding to the first abutment portion is provided on the upper side of the annular ring. A second positioning groove corresponding to the positioning rib is provided on the annular support, and the second positioning groove has an inner wall. A limiting protrusion for abutting and limiting the positioning against the inner wall of the groove is provided on the outer wall of the positioning rib. When the intermediate box body is placed on the upper side of the annular ring, the first abutment portion and the second abutment portion abut against each other. When the cover is placed on the upper side of the annular support, the positioning rib is positioned within the second positioning groove.
[0014] Compared to existing technologies, this microwave oven and oven-compatible heating pot features a heating composite layer. The coating of this layer, along with the first and second microwave-absorbing heating elements, all absorb microwaves to generate heat, thus heating the food inside the metal pot. This results in rapid food heating and the pot is also suitable for oven heating, offering a wide range of applications. The grinding and pressing process ensures a tighter bond between the first and second microwave-absorbing heating elements, preventing them from separating and becoming damaged. This process also provides good high-temperature resistance, preventing separation even at high temperatures and extending the lifespan. Several supporting protrusions on the underside of the heating composite layer allow for more direct heat transfer to the bottom of the metal pot, enhancing heat conduction and enabling the entire pot to heat up faster and more effectively. The supporting protrusions create a gap between the heating composite layer and the microwave oven / oven, promoting air circulation and improving heating efficiency and uniformity. This microwave oven and oven-compatible heating pot offers three configuration options for greater flexibility. Attached Figure Description
[0015] Figure 1 This is a perspective view of the third combined state of the heating pot that is universal for microwave ovens and ovens according to this utility model;
[0016] Figure 2 This is a schematic diagram of the bottom structure of the heating pot that is universal for microwave ovens and ovens according to this utility model;
[0017] Figure 3 This is a cross-sectional view of the microwave oven and oven universal heating pot of this utility model;
[0018] Figure 4 for Figure 3 Enlarged view of section A in the middle;
[0019] Figure 5 This is a schematic diagram of the first combined state of the heating pot that is compatible with both microwave ovens and ovens according to this utility model.
[0020] Figure 6 This is a schematic diagram of the structure of the protruding strip of the heating pot that is universal for microwave ovens and ovens according to this utility model;
[0021] Figure 7 This is a schematic diagram of the second combined state of the heating pot that is universal for microwave ovens and ovens according to this utility model;
[0022] Figure 8 This is a schematic diagram of the structure of the middle box of the heating pot, which is universal for microwave ovens and ovens, according to this utility model.
[0023] Figure 9 for Figure 8 Enlarged view of section B;
[0024] Figure 10 This is a schematic diagram of the structure of the heating pot lid body, which is universal for microwave ovens and ovens according to this utility model;
[0025] Figure 11 for Figure 10 Enlarged view of section C;
[0026] Figure 12 This is a perspective view of Embodiment 2 of the present invention;
[0027] Figure 13 This is a schematic diagram of the bottom structure of Embodiment 2 of this utility model;
[0028] Figure 14 This is a perspective view of Embodiment 3 of the present invention;
[0029] Figure 15 This is a schematic diagram of the bottom structure of Embodiment 3 of this utility model;
[0030] Figure 16 This is a perspective view of Embodiment 4 of the present utility model;
[0031] Figure 17 This is a schematic diagram of the bottom structure of Embodiment 4 of this utility model;
[0032] Figure 18 This is a perspective view of Embodiment 5 of the present invention;
[0033] Figure 19 This is a schematic diagram of the bottom structure of Embodiment 5 of this utility model;
[0034] Figure 20 This is a schematic diagram of the structure of Embodiment Six of this utility model;
[0035] Figure 21 This is a perspective view of Embodiment Seven of the present utility model;
[0036] Figure 22 This is a schematic diagram of the bottom structure of Embodiment Seven of this utility model;
[0037] The component names corresponding to the various reference numerals in the figure are as follows: 1 is the metal pot body, 101 is the raised strip, 2 is the heating composite layer, 21 is the coating, 22 is the first microwave absorbing heating element, 23 is the second microwave absorbing heating element, 201 is the supporting protrusion, 3 is the annular ring, 301 is the water pouring groove, 302 is the side handle, 303 is the first positioning groove, 304 is the second abutment part, 4 is the lid, 401 is the positioning rib, 4011 is the limiting protrusion, 402 is the lid drip, 5 is the middle box, 51 is the metal plate, 52 is the annular support, 521 is the first abutment part, 522 is the second positioning groove, and 5221 is the inner wall of the groove. Detailed Implementation
[0038] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0039] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.
[0040] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.
[0041] Example 1:
[0042] See Figures 1-11 This utility model provides a microwave oven and oven compatible heating pot, comprising a metal pot body 1. A heating composite layer 2 is exposed on the outer side of the metal pot body 1. The heating composite layer 2 includes a coating 21, a first microwave absorbing heating element 22, and a second microwave absorbing heating element 23. The coating 21 is applied to the bottom of the metal pot body 1. The first microwave absorbing heating element 22 is located on the side of the coating 21 away from the metal pot body 1, and the second microwave absorbing heating element 23 is located on the side of the first microwave absorbing heating element 22 away from the coating 21. All three elements—the coating 21, the first microwave absorbing heating element 22, and the second microwave absorbing heating element 23—can absorb microwaves for heating. This microwave oven and oven compatible heating pot... When a microwave oven-compatible heating pan is placed in a microwave oven for microwave heating, the coating 21, the first microwave-absorbing heating element 22, and the second microwave-absorbing heating element 23 absorb microwaves to generate heat, which is then conducted to the metal pan body 1 to heat the food inside. This microwave oven-compatible heating pan has a heating composite layer. The coating of the heating composite layer, the first microwave-absorbing heating element, and the second microwave-absorbing heating element can all absorb microwaves to generate heat, thereby heating the food inside the metal pan. The food heats up quickly, reaching approximately 170°C within 30-60 seconds. Furthermore, this heating pan is also suitable for oven heating, making it widely applicable.
[0043] Specifically, when this microwave and oven compatible heating pot is placed in the oven for heating, the oven's heating principle involves heating through three methods: thermal radiation, thermal conduction, and hot air convection. When the oven is working, it heats the metal pot 1 through these three methods. Since the metal pot 1 is made of metal, it has good thermal conductivity, allowing the metal pot 1 to efficiently conduct heat to the food inside, thus achieving the function of rapid heating of the food. Therefore, this heating box is also suitable for oven heating.
[0044] See Figures 1-4 The heating composite layer 2 is disposed on the lower side of the metal pot body 1. The coating 21 is a microwave absorbing coating. The microwave absorbing coating mentioned above is existing technology. For example, a microwave absorbing coating made of resin and ceramic powder or other coatings with microwave absorption and heating characteristics can be selected. The first microwave absorbing heating element 22 and the second microwave absorbing heating element 23 are both made of silicone. The microwave absorption generates instantaneous heating. The melting point of the first microwave absorbing heating element 22 and the second microwave absorbing heating element 23 is 230℃-250℃. They are more resistant to high temperature during heating and are less prone to melting, deformation and other problems, resulting in a long service life. The maximum heating temperature of microwave ovens and ovens is generally below 230℃. Therefore, silicone material with a melting point of 230℃ or above is selected, which can be used for heating in both microwave ovens and ovens, and has a wide range of applications. Of course, for some special microwave ovens or ovens with a maximum temperature higher than 230℃, silicone material with a higher melting point can also be selected, such as silicone material with a melting point of 240℃ or 250℃ or higher.
[0045] See Figure 3 and Figure 4 The first microwave absorbing heating element 22 and the second microwave absorbing heating element 23 are connected by a grinding and pressing process. During the grinding and pressing process, the silicone molecular chains are fully cross-linked through high temperature and high pressure, so that the two components of the first microwave absorbing heating element 22 and the second microwave absorbing heating element 23 form a chemical bond at the interface, rather than a simple physical bond. Therefore, the first microwave absorbing heating element 22 and the second microwave absorbing heating element 23 connected by the grinding and pressing process are more tightly bonded, avoiding the problem of them separating and being damaged. At the same time, the grinding and pressing process has good high temperature resistance and is not easy to separate at high temperatures, resulting in a long service life. The first microwave absorbing heating element 22 is bonded to the coating 21 with adhesive. The adhesive is a high temperature resistant adhesive, and the temperature that the high temperature resistant adhesive can withstand is higher than the maximum heating temperature of the microwave oven or oven, avoiding separation at high temperatures. The process is simple and the structural connection is stable.
[0046] See Figures 1-4The inner surface of the metal pot body 1 is coated with a non-stick coating, which is either a Teflon coating or a ceramic coating. This reduces the likelihood of food sticking to the inner surface of the metal pot body 1 during heating, making it easier to remove the food and clean the pot body 1, thus improving the user experience. Several support protrusions 201 are provided on the lower side of the heating composite layer 2, allowing the heat generated by microwave heating to be more directly conducted to the bottom of the metal pot body 1. This enhances heat conduction, allowing the metal pot body 1 to heat up faster and heat food more effectively. Due to the design of the support protrusions 201, a gap is formed between the heating composite layer 2 and the microwave oven / oven, which facilitates air circulation and improves heating efficiency and uniformity. The contact between the support protrusions 201 and the microwave oven makes the metal pot body 1 more stable during heating or placement, preventing it from shaking. The heating composite layer 2 preferably covers the entire outer bottom surface of the metal pot body 1, ensuring that heat is evenly conducted to the entire metal pot body 1, thereby achieving uniform heating of the food inside the metal pot body 1 and improving the heating effect.
[0047] See Figure 1 and Figure 6 The inner bottom of the metal pot body 1 is provided with several protruding strips 101, which reduces the contact area between the food and the inner bottom of the metal pot body 1, and reduces the possibility of food sticking to the inner bottom of the metal pot body 1 during heating. The metal pot body 1 is provided with an annular ring 3, on which a water-pouring groove 301 and a side handle 302 are provided. The water-pouring groove 301 can easily concentrate the soup in the metal pot body 1 and pour it out, avoiding water dripping into the surrounding environment when pouring out the soup, keeping the operation clean and safe. There are two symmetrically arranged side handles 302, which make it easy for users to pick up and move this heating box. The annular ring 3 and the side handles 302 are both made of non-stick silicone. The non-stick silicone is nano-hydrophobic coated silicone or antistatic modified silicone. The silicone material of the side handles 302 serves to prevent scalding, and the non-stick silicone material makes the surface less prone to dust accumulation, improving the cleanliness of the surface of the annular ring 3 and the side handles 302.
[0048] See Figure 1 , Figure 5 , Figure 6 and Figure 10 The microwave oven and oven compatible heating pot also includes a lid 4, which is detachably mounted on the upper part of the metal pot body 1. The lower side of the lid 4 is provided with a positioning rib 401, and the annular ring 3 is provided with a first positioning groove 303. When the lid 4 is placed on the upper side of the annular ring 3, the positioning rib 401 is positioned in the first positioning groove 303. After the lid 4 is covered, it is convenient to keep the food in the metal pot body 1 warm. Moreover, the lid 4 is not easy to slip or fall off after it is placed on the upper part of the metal pot body 1, and it is reliable in use.
[0049] See Figures 6-11The microwave and oven compatible heating pot also includes an intermediate box 5, which includes a metal plate 51 and an annular support 52 connected to the upper part of the metal plate 51. Two heating composite layers 2 are provided, one located at the bottom outer surface of the metal pot body 1 and the other at the bottom outer surface of the metal plate 51. A first abutment portion 521 is provided on the lower side of the annular support 52, and a second abutment portion 304 corresponding to the first abutment portion 521 is provided on the upper side of the annular ring 3. A second abutment portion 304 corresponding to the positioning rib 401 is provided on the annular support 52. The second positioning groove 522 has an inner wall 5221, and the outer wall of the positioning rib 401 has several limiting protrusions 4011 for abutting against and limiting the inner wall 5221. When the middle box 5 is placed on the upper side of the annular ring 3, the first abutting part 521 and the second abutting part 304 abut against each other. When the cover 4 is placed on the upper side of the annular support 52, the positioning rib 401 is positioned in the second positioning groove 522, so that the cover 4 is not easy to slip or fall when it is placed on the upper side of the annular support 52, and the use is reliable.
[0050] Further, see Figure 1 , Figure 5 , Figure 7 , Figure 9 and Figure 11 This microwave and oven compatible heating pot has three combination states: 1. Place food into the metal pot body 1, and then place the lid 4 directly on the upper side of the ring 3 to form the first combination state. At this time, the positioning rib 401 is positioned inside the first positioning groove 303. This combination heating pot can be placed in a microwave oven or oven for heating; 2. Place food into the metal tray 51 of the middle box body 5, and then place the lid 4 directly on the upper side of the ring support 52 to form the second combination state. This combination middle box body 5 can be placed in a microwave oven or oven for heating; 3. When storing, stack the metal pot body 1, the middle box body 5, and the lid 4 from bottom to top to form the third combination state. At this time, the first abutting part 521 abuts against the second abutting part 304, and the positioning rib 401 is positioned inside the first positioning groove 303. The structure is compact, occupies little space, and is easy to store. It can be combined and used according to needs, and has various usage methods.
[0051] This invention relates to a microwave-safe and oven-safe heating pot, featuring a heating composite layer. The coating of this layer, along with the first and second microwave-absorbing heating elements, absorb microwaves to generate heat, thus heating food within the metal pot. Food heats up quickly, and the pot is also suitable for oven heating, offering a wide range of applications. The grinding and pressing process ensures a tighter bond between the first and second microwave-absorbing heating elements, preventing them from separating and becoming damaged. This process also provides good high-temperature resistance, preventing separation even at high temperatures and extending the pot's lifespan. Several supporting protrusions on the underside of the heating composite layer allow for more direct heat transfer to the bottom of the metal pot, enhancing heat conduction and resulting in faster overall heating of the food. The supporting protrusions create a gap between the heating composite layer and the microwave / oven, promoting air circulation and improving heating efficiency and uniformity. This microwave-safe and oven-safe heating pot offers three configuration options for greater flexibility.
[0052] Example 2:
[0053] See Figure 12 and Figure 13 In this embodiment, the metal pot body 1 is round and relatively short, so that it can be placed in a microwave oven and oven for heating. Users can choose different shapes of metal pot bodies 1 for use. In this embodiment, the lid body 4 is provided with a lid drip 402. The lid drip 402 is made of non-stick silicone material, which is not easy to stick to dust and is easy to clean.
[0054] Example 3:
[0055] See Figure 14 and Figure 15 In this embodiment, the metal pot body 1 is square and relatively short, allowing users to choose different shapes of metal pot bodies 1 for use.
[0056] Example 4:
[0057] See Figure 16 and Figure 17 In this embodiment, the metal pot body 1 is elliptical and relatively short, allowing users to choose different shapes of metal pot bodies 1 for use.
[0058] Example 5:
[0059] See Figure 18 and Figure 19 In this embodiment, the metal pot body 1 is square and flat, allowing users to choose different shapes of metal pot bodies 1 for use.
[0060] Example 6:
[0061] See Figure 20In this embodiment, the metal pot body 1 is round and flat, allowing users to choose different shapes of metal pot bodies 1 for use.
[0062] Example 7:
[0063] See Figure 21 and Figure 22 In this embodiment, the metal pot body 1 is rectangular and relatively short, allowing users to choose different shapes of metal pot bodies 1 for use.
[0064] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
Claims
1. A microwave-safe and oven-safe heating pan, characterized in that, The device includes a metal pot body (1), on the outer side of which a heating composite layer (2) is exposed. The heating composite layer (2) includes a coating (21), a first microwave absorbing heating element (22), and a second microwave absorbing heating element (23). The coating (21) is applied to the bottom of the metal pot body (1). The first microwave absorbing heating element (22) is located on the side of the coating (21) away from the metal pot body (1). The second microwave absorbing heating element (23) is located on the side of the first microwave absorbing heating element (22) away from the coating (21). The coating (21), the first microwave absorbing heating element (22), and the second microwave absorbing heating element (23) can all absorb microwaves to generate heat. When microwave heating occurs, the coating (21), the first microwave absorbing heating element (22), and the second microwave absorbing heating element (23) absorb microwaves to generate heat and conduct the generated heat to the metal pot body (1) to heat the food inside the metal pot body (1).
2. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The heating composite layer (2) is disposed on the lower side of the metal pot body (1). The coating (21) is a microwave absorbing coating. The first microwave absorbing heating element (22) and the second microwave absorbing heating element (23) are both made of silicone. The microwave absorption generates heat and raises the temperature instantly. The melting point of the first microwave absorbing heating element (22) and the second microwave absorbing heating element (23) is 230℃-250℃.
3. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The first microwave absorbing heating element (22) and the second microwave absorbing heating element (23) are connected by a grinding and pressing process.
4. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The first microwave absorbing heating element (22) is bonded to the coating (21).
5. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The inner surface of the metal pot body (1) is coated with a non-stick coating, which is a Teflon coating or a ceramic coating.
6. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The lower side of the heating composite layer (2) is provided with several support protrusions (201).
7. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The inner bottom of the metal pot body (1) is provided with several protruding strips (101).
8. The microwave oven and oven universal heating pot according to claim 1, characterized in that, The metal pot body (1) is provided with an annular ring (3), and the annular ring (3) is provided with a water pouring groove (301) and a side handle (302). The annular ring (3) and the side handle (302) are both made of non-stick silicone material. The non-stick silicone is nano-hydrophobic coated silicone or antistatic modified silicone.
9. The microwave oven and oven universal heating pot according to claim 8, characterized in that, It also includes a cover (4), which is detachably mounted on the upper end of the metal pot body (1). A positioning rib (401) is provided on the lower side of the cover (4), and a first positioning groove (303) is provided on the annular ring (3). When the cover (4) is placed on the upper side of the annular ring (3), the positioning rib (401) is positioned in the first positioning groove (303).
10. The microwave oven and oven universal heating pot according to claim 9, characterized in that, It also includes an intermediate box (5), which includes a metal plate (51) and an annular support (52) connected to the upper part of the metal plate (51). Two heating composite layers (2) are provided, one of which is located at the bottom outer surface of the metal pot body (1), and the other is located at the bottom outer surface of the metal plate (51). A first abutment (521) is provided on the lower side of the annular support (52), and a second abutment (304) corresponding to the first abutment (521) is provided on the upper side of the annular ring (3). The annular support (52) is further provided with... A second positioning groove (522) corresponding to the positioning rib (401) is provided. The second positioning groove (522) is provided with an inner wall (5221). The outer wall of the positioning rib (401) is provided with a limiting protrusion (4011) for abutting against and limiting the inner wall (5221). When the intermediate box (5) is placed on the upper side of the annular ring (3), the first abutting part (521) abuts against the second abutting part (304). When the cover (4) is placed on the upper side of the annular bracket (52), the positioning rib (401) is positioned in the second positioning groove (522).