Electric stewpot

Abstract

The utility model discloses an electric stewpot which comprises a pot body, a ceramic inner container arranged in the pot body and a pot cover covering the ceramic inner container, the pot cover comprises an upper cover and an anti-overflow inner cover installed on the upper cover, the anti-overflow inner cover comprises a drainage cover and an anti-overflow groove surrounding the drainage cover, a first drainage hole is formed in the drainage cover, and a second drainage hole is formed in the anti-overflow groove. The side, facing the upper cover, of the bottom wall of the anti-overflow groove comprises a guide face extending from top to bottom and a sunken part connected with the lower end of the guide face so that the guide face can guide liquid in the anti-overflow groove to flow to the sunken part, and a backflow hole penetrating through the bottom wall of the anti-overflow groove is formed in the sunken part. According to the electric stewpot, liquid in the anti-overflow groove can flow back in time, and effective anti-overflow is achieved.

Description

Technical field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to an electric stew pot. [Background Technology]

[0002] A conventional electric stew pot includes a pot body, a ceramic inner pot placed within the pot body, and a pot lid that covers the ceramic inner pot. The pot lid includes an upper cover and an anti-overflow inner cover mounted on the upper cover. The upper cover is provided with a vent hole. The anti-overflow inner cover includes a drainage cover and an anti-overflow groove surrounding the drainage cover. The drainage cover is provided with a first drainage hole. The bottom wall of the anti-overflow groove is smooth and has a reflux hole. When the electric stew pot is heated, liquid in the ceramic inner pot boils and generates high-temperature steam. The high-temperature steam, under the guidance of the drainage cover, enters between the drainage cover and the upper cover through the first drainage hole, condenses to form liquid, and then flows along the drainage cover into the anti-overflow groove. However, the bottom of the conventional anti-overflow groove is too smooth, which hinders the boiled-off portion from flowing back into the ceramic inner pot through the reflux hole in a timely manner. In addition, some high-temperature steam also enters the anti-overflow groove through the reflux hole. As a result, the liquid in the anti-overflow groove that cannot be discharged in time will form bubbles due to the disturbance of the high-temperature steam and be discharged through the vent hole of the upper cover, resulting in an overflow state, thereby reducing the user experience. [Utility Model Content]

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an electric stew pot, which can enable the liquid in the anti-overflow groove to flow back in time, thereby achieving effective overflow prevention.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An electric stew pot comprises a pot body, a ceramic liner placed in the pot body, and a pot lid covering the ceramic liner, the pot lid comprising an upper cover and an anti-overflow inner cover mounted on the upper cover, the anti-overflow inner cover comprising a drainage cover and an anti-overflow groove surrounding the drainage cover, the drainage cover being provided with a first drainage hole, the bottom wall of the anti-overflow groove comprising a guide surface extending from top to bottom and a recessed portion connected to the lower end of the guide surface on a side facing the upper cover, so that the guide surface guides liquid in the anti-overflow groove to flow toward the recessed portion, and the recessed portion is provided with a reflux hole penetrating the bottom wall of the anti-overflow groove.

[0006] In the above-mentioned electric stew pot, the bottom wall of the anti-overflow groove has a circumferentially extending wave surface on the side facing the upper cover, and the wave surface includes an upwardly arched crest and a downwardly recessed trough. The guide surface is arranged between the crest and the trough, and the recessed portion is arranged at the trough.

[0007] In the above electric stew pot, the bottom wall of the anti-overflow groove is a circumferentially extending wave structure.

[0008] In the above electric stew pot, the number of the guide surfaces is two and they are arc-shaped, the recessed portion is provided between the lower ends of the two guide surfaces, and the upper ends of the two guide surfaces are connected.

[0009] In the above electric stew pot, the bottom wall of the anti-overflow groove is further provided with a second drainage hole, and the second drainage hole is provided at the upper end of the guide surface or close to the upper end of the guide surface.

[0010] In the above electric stew pot, the diameter of the second drainage hole is larger than the diameter of the reflux hole.

[0011] In the above electric stew pot, the drainage cover is a conical cover that gradually shrinks upward, and the first drainage hole is provided near the top of the conical cover.

[0012] In the above electric stew pot, at least some of the first drainage holes and the return holes are arranged in radial correspondence one to one.

[0013] In the above electric stew pot, the anti-overflow inner cover is sealed to the upper cover to form a heat preservation chamber between the anti-overflow inner cover and the upper cover, and the first drainage hole and the reflux hole are both connected to the heat preservation chamber.

[0014] In the above-mentioned electric stew pot, the anti-overflow groove includes an inner wall, an outer wall and a bottom wall connected between the inner wall and the outer wall. The upper end of the inner wall is connected to the drainage cover, and the upper end of the outer wall is bent outward to form a flange. The flange and the upper cover are both pressed onto the top of the ceramic inner pot.

[0015] Beneficial effects of the utility model:

[0016] 1. In the present invention, the bottom wall of the anti-overflow groove facing the upper cover includes a guide surface extending from top to bottom and a recessed portion connected to the lower end of the guide surface. The guide surface can guide the liquid in the anti-overflow groove to flow into the recessed portion. The recessed portion is provided with a reflux hole running through the bottom wall of the anti-overflow groove. In this way, the liquid in the anti-overflow groove will flow into the lower recessed portion through the guidance of the guide surface under the action of gravity, and be discharged into the ceramic inner pot in time through the reflux hole, thereby avoiding the overflow of the pot. In addition, when the reflux hole is designed to be small and some liquid still gathers in the recessed portion, the accumulated liquid can also prevent high-temperature steam from flowing into the anti-overflow groove through the reflux hole, thereby avoiding the high-temperature steam from disturbing the liquid in the anti-overflow groove and causing the pot to overflow.

[0017] 2. The bottom wall of the overflow prevention groove, facing the upper cover, is a circumferentially extending wave surface, comprising upwardly arched crests and downwardly recessed troughs. The guide surface is located between the crests and troughs, and the recessed portion is located in the trough. This design guides the liquid to flow dispersedly into the multiple recessed portions, reducing the amount of liquid accumulated in each recessed portion, thereby allowing the liquid in each recessed portion to be promptly discharged through the reflux holes. Furthermore, this design increases the number of reflux holes while reducing their diameter, allowing them to have a bubble-breaking effect, thus preventing bubbles in the ceramic liner from entering between the overflow prevention inner cover and the upper cover through the reflux holes and causing overflow.

[0018] 3. The bottom wall of the overflow prevention groove has a circumferentially extending wave structure. This design not only facilitates the processing and forming of the bottom wall of the overflow prevention groove, but also enhances its structural strength. Furthermore, the side of the overflow prevention groove bottom wall facing away from the upper cover, corresponding to the wave trough, is convex downward, diverting high-temperature steam to flow to both sides. This reduces the pressure in the area corresponding to the wave trough on the side of the overflow prevention groove bottom wall facing away from the upper cover, thereby facilitating the liquid to fall back through the reflux hole under the action of gravity and pressure differential.

[0019] 4. The bottom wall of the overflow prevention groove is also provided with a second drainage hole, located at or near the upper end of the guide surface. This design allows more high-temperature steam to enter between the overflow prevention inner cover and the upper cover, thereby preventing excessive pressure in the ceramic inner container, as liquid will not accumulate at or near the upper end of the guide surface.

[0020] 5. The diameter of the second drainage hole is larger than that of the return hole. This design facilitates the flow of high-temperature steam through the second drainage hole into the space between the anti-overflow inner cover and the upper cover, thereby reducing the amount of steam entering the space between the anti-overflow inner cover and the upper cover through the return hole. This in turn reduces the pressure on the area below the return hole, allowing the liquid to fall back smoothly through the return hole under the action of gravity and pressure differential.

[0021] 6. The drainage hood is a tapered hood that gradually tapers upward, with the first drainage hole located near the top of the hood. This design allows most of the steam in the ceramic liner to enter the drainage hood and, through the first drainage hole, flow between the overflow-proof inner cover and the upper cover. This reduces the amount of steam that enters the overflow-proof groove through the reflux hole, further reducing the pressure on the area below the reflux hole. This allows the liquid to fall back smoothly through the reflux hole under the action of gravity and pressure differential. Furthermore, after liquefaction, the high-temperature steam between the overflow-proof inner cover and the upper cover can flow rapidly into the overflow-proof groove under the guidance of the tapered hood and be discharged through the reflux hole, thereby increasing the reflux speed.

[0022] 7. At least some of the first drainage holes are arranged in radial correspondence with the reflux holes. This design facilitates rapid reflux of the liquid through the reflux holes.

[0023] 8. The overflow-proof inner cover is sealed to the upper cover to form a heat-insulating chamber between the overflow-proof inner cover and the upper cover. The first drainage hole and the return hole are both connected to the heat-insulating chamber. This design can reduce heat loss and thus improve cooking efficiency.

[0024] 9. The anti-overflow groove includes an inner wall, an outer wall, and a bottom wall connecting the inner and outer walls. The upper end of the inner wall is connected to the drainage cover, and the upper end of the outer wall is bent outward to form a flange. The flange and the upper cover are press-fitted onto the top of the ceramic inner pot. This design can improve the sealing of the pot lid on the ceramic inner pot and prevent overflow.

[0025] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a cross-sectional view of the electric stew pot in Example 1 of the present utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the anti-overflow inner cover in Example 1 of the present utility model. Figure 1 ;

[0029] Figure 3 This is a schematic diagram of the structure of the anti-overflow inner cover in Example 1 of the present utility model. Figure 2 ;

[0030] Figure 4 This is a structural diagram of the electric stew pot with the upper cover removed in Example 1 of the present utility model;

[0031] Figure 5 This is a cross-sectional view of the anti-overflow inner cover in Example 2 of the present utility model;

[0032] Figure 6 This is a cross-sectional view of the anti-overflow inner cover in Example 3 of the present invention.

[0033] Reference numerals:

[0034] 001, cavity; 100, pot body; 110, aluminum pot; 120, outer cover; 130, heating device; 200, ceramic liner; 300, pot lid; 310, upper cover; 311, mounting column; 320, anti-overflow inner cover; 321, drainage cover; 3210, first drainage hole; 322, anti-overflow groove; 3221, guide surface; 3222, recessed portion; 3223, reflux hole; 3224, second drainage hole; 3225, inner wall; 3226, outer wall; 3227, bottom wall; 3228, flange; 330, elastic rubber pad. [Specific implementation method]

[0035] The utility model provides an electric stew pot, comprising a pot body, a ceramic liner placed in the pot body, and a pot cover covering the ceramic liner, the pot cover comprising an upper cover and an anti-overflow inner cover mounted on the upper cover, the anti-overflow inner cover comprising a drainage cover and an anti-overflow groove surrounding the drainage cover, the drainage cover being provided with a first drainage hole, the bottom wall of the anti-overflow groove comprising a guide surface extending from top to bottom and a recessed portion connected to the lower end of the guide surface on the side facing the upper cover, so that the guide surface guides the liquid in the anti-overflow groove to flow toward the recessed portion, The recessed portion is provided with a reflux hole which penetrates the bottom wall of the anti-overflow groove. In this way, the liquid in the anti-overflow groove will flow into the lower recessed portion through the guide surface under the action of gravity, and be discharged into the ceramic inner pot in time through the reflux hole, thereby avoiding overflow. In addition, when the reflux hole is designed to be small and some liquid still gathers in the recessed portion, the accumulated liquid can also prevent the high-temperature steam from flowing into the anti-overflow groove through the reflux hole, thereby avoiding the high-temperature steam from disturbing the liquid in the anti-overflow groove and causing overflow.

[0036] The technical solutions of the embodiments of the present invention are explained and illustrated below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all fall within the scope of protection of the present invention. In addition, it should be understood that the following words indicating orientation or positional relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Example 1

[0038] like Figures 1 to 4As shown, the electric stew pot in this embodiment includes a pot body 100, a ceramic liner 200 and a pot cover 300, wherein the pot body 100 includes an aluminum pot 110, an outer cover 120, a heating device 130 and a control device, wherein the outer cover 120 is arranged on the outside of the aluminum pot 110 and forms an installation cavity with the aluminum pot 110, the heating device 130 is fixed on the outer wall of the aluminum pot 110 and placed in the installation cavity, the control device is arranged in the installation cavity and connected to the heating device 130 to control the start and stop and heating power of the heating device 130, the aluminum pot 110 forms a accommodating cavity for accommodating the ceramic liner 200, the ceramic liner 200 is placed in the accommodating cavity, the ceramic liner 200 has a cavity 001 for holding food, and the pot cover 300 covers the ceramic liner 200. The pot cover 300 in this embodiment includes an upper cover 310 and an anti-overflow inner cover 320 installed on the upper cover 310. The anti-overflow inner cover 320 includes a drainage cover 321 and an anti-overflow groove 322 surrounding the drainage cover 321. The drainage cover 321 is provided with a first drainage hole 3210. The bottom wall of the anti-overflow groove 322 facing the upper cover 310 includes a guide surface 3221 extending from top to bottom and a recessed portion 3222 connected to the lower end of the guide surface 3221, so that the guide surface 3221 guides the liquid in the anti-overflow groove 322 to flow to the recessed portion 3222. The recessed portion 3222 is provided with a recessed portion that penetrates the bottom wall of the anti-overflow groove. 3223, so that the liquid in the anti-overflow groove 322 will flow into the lower recessed portion 3222 through the guide surface 3221 under the action of gravity, and be discharged into the ceramic inner pot 200 in time through the reflux hole 3223, thereby avoiding the overflow state; in addition, when the reflux hole 3223 is designed to be small and some liquid still gathers in the recessed portion 3222, the accumulated liquid can also prevent the high-temperature steam from flowing into the anti-overflow groove 322 through the reflux hole 3223, thereby avoiding the high-temperature steam from disturbing the liquid in the anti-overflow groove 322 and causing the overflow state.

[0039] Specifically, the overflow-proof inner cover 320 in this embodiment is a metal cover, and the upper cover 310 is a ceramic cover. In order to install the overflow-proof inner cover 320 on the upper cover 310, the upper cover 310 in this embodiment is bonded with a downwardly extending mounting post 311, and the drainage cover 321 is provided with a mounting hole for the mounting post 311 to pass through. The lower end of the mounting post 311 is provided with an anti-slip protrusion, and an elastic rubber pad 330 is provided between the hole wall of the mounting hole and the mounting post 311. The outer diameter of the anti-slip protrusion is larger than the hole diameter of the elastic rubber pad 330, so that the overflow-proof inner cover 320 and the elastic rubber pad 330 are confined on the mounting post 311, thereby realizing the connection between the overflow-proof inner cover 320 and the upper cover 310.

[0040] The overflow prevention groove 322 in this embodiment includes an inner wall 3225, an outer wall 3226, and a bottom wall 3227 connected between the inner and outer walls 3225 and 3226. The upper end of the inner wall 3225 is preferably integrally connected to the bottom of the drainage cover 321. The upper end of the outer wall 3226 is bent outward to form an annular flange 3228. The flange 3228 and the upper cover 310 are press-fitted onto the top of the ceramic inner container 200. This design can improve the sealing of the pot lid 300 on the ceramic inner container 200 and prevent the pot from overflowing.

[0041] The drainage cover 321 in this embodiment is a conical cover that gradually tapers upward. The first drainage hole 3210 is provided near the top of the conical cover, while the overflow prevention groove 322 is provided around the bottom of the conical cover. This design allows most of the steam in the ceramic inner liner 200 to enter the drainage cover 321 and enter the space between the overflow prevention inner cover 320 and the upper cover 310 through the first drainage hole 3210, thereby reducing the amount of steam that enters the overflow prevention groove 322 through the return hole 3223, thereby reducing the pressure on the area below the return hole 3223, allowing the liquid to fall back smoothly through the return hole 3223 under the action of gravity and pressure differential. In addition, after liquefaction, the high-temperature steam between the overflow prevention inner cover 320 and the upper cover 310 can also flow rapidly into the overflow prevention groove 322 under the guidance of the conical cover and be discharged through the return hole 3223, thereby increasing the return speed.

[0042] In this embodiment, the side of the bottom wall 3227 facing the upper cover 310 is a circumferentially extending wave surface, which includes an upwardly arched crest and a downwardly recessed trough. The guide surface 3221 is arranged between the crest and the trough, and the recessed portion 3222 is arranged at the trough. The recessed portion 3222 can be the connection point of the bottom ends of two adjacent guide surfaces 3221, or it can be a recessed surface connected between the bottom ends of two adjacent guide surfaces 3221. With such a design, the bottom wall 3227 can be provided with multiple recessed portions 3222 and multiple groups of guiding surfaces 3221 located on both sides of the recessed portions 3222 at circumferential intervals, thereby guiding the liquid to flow to the multiple recessed portions 3222 in a dispersed manner, so as to reduce the amount of liquid accumulated in each recessed portion 3222, and thereby enable the liquid in each recessed portion 3222 to be discharged in time through the reflux hole 3223; in addition, with such a design, the aperture of the reflux hole 3223 can be reduced while increasing the number of the reflux holes 3223, so that the reflux holes 3223 have a bubble-breaking effect, thereby avoiding the problem of bubbles in the ceramic liner 200 entering between the anti-overflow inner cover 320 and the upper cover 310 through the reflux holes 3223 and causing overflow.

[0043] To create the aforementioned wavy surface on the side of the bottom wall 3227 facing the upper cover 310, the bottom wall 3227 of the overflow prevention groove 322 in this embodiment has a circumferentially extending wavy structure. This design not only facilitates the processing and forming of the bottom wall 3227 but also enhances its structural strength. Furthermore, the downward convex portion of the side of the bottom wall 3227 facing away from the upper cover 310, corresponding to the trough, diverts high-temperature steam to two sides, reducing the pressure in the area corresponding to the trough on the side of the bottom wall 3227 facing away from the upper cover 310. This facilitates the liquid to fall back through the reflux hole 3223 under the action of gravity and pressure differential.

[0044] Preferably, in this embodiment, the bottom wall 3227 is further provided with a second drainage hole 3224 , and the upper end of each guide surface 3221 or a portion close to the upper end of the guide surface 3221 is provided with a second drainage hole 3224 . With such a design, since liquid will not accumulate at the upper end of the guide surface 3221 or near the upper end of the guide surface 3221, a second drainage hole 3224 is set at this position, which can allow more high-temperature steam to enter between the anti-overflow inner cover 320 and the upper cover 310, thereby avoiding excessive pressure in the ceramic inner liner 200. In addition, when the high-temperature steam flows to the return hole 3223, it will be divided into two air flows by the trough part of the bottom wall 3227. The two air flows flow along the inclined wall to the second drainage holes 3224 on both sides of the return hole 3223, so that the flow rate discharged from the second drainage hole 3224 is accelerated, and the pressure in the area below the return hole 3223 is reduced, thereby allowing the liquid to quickly return through the return hole 3223 under the action of gravity and pressure difference, forming an internal circulation and effectively preventing overflow.

[0045] In this embodiment, the aperture of the second drainage hole 3224 is larger than the aperture of the return hole 3223. This design is more conducive to the high-temperature steam entering the space between the overflow-proof inner cover 320 and the upper cover 310 through the second drainage hole 3224, thereby reducing the amount of steam entering the space between the overflow-proof inner cover 320 and the upper cover 310 through the return hole 3223, and further reducing the pressure on the area below the return hole 3223, so that the liquid falls and flows back smoothly through the return hole 3223 under the action of gravity and pressure difference. Preferably, at least some of the first drainage holes 3210 and the return hole 3223 are arranged in a one-to-one radial correspondence, that is, the horizontal projection of at least some of the first drainage holes 3210 and the horizontal projection of the return hole 3223 are on the same radial direction of the conical cover. This design can facilitate the rapid return of liquid through the return hole 3223.

[0046] Finally, a sealing ring is provided between the flange 3228 and the upper cover 310 in this embodiment to achieve a sealed connection between the overflow-proof inner cover 320 and the upper cover 310. This creates a heat-insulating chamber between the overflow-proof inner cover 320 and the upper cover 310, with both the first drainage hole 3210 and the return hole 3223 communicating with the heat-insulating chamber. This design reduces heat loss and improves cooking efficiency.

[0047] Example 2

[0048] like Figure 5 As shown, compared with the first embodiment, the difference of this embodiment is that, when the side of the bottom wall 3227 facing the upper cover is a circumferentially extending wavy surface, the side of the bottom wall 3227 facing away from the upper cover 310 can also be a horizontal surface, so that the wall thickness of the bottom wall 3227 forms an undulating change in the circumferential direction.

[0049] Example 3

[0050] like Figure 6 As shown, compared with the first embodiment, the difference of this embodiment is that the number of guide surfaces 3221 is two and they are arc-shaped, the recessed portion 3222 is provided between the lower ends of the two guide surfaces 3221, and the upper ends of the two guide surfaces 3221 are connected, so that the two guide surfaces 3221 can be connected end to end to form an annular surface with one side higher and the other side of the bottom opposite, that is, the side of the bottom wall 3227 facing the upper cover 310 is a horizontal surface.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. An electric stew pot, comprising a pot body, a ceramic liner placed in the pot body, and a pot cover covering the ceramic liner, the pot cover comprising an upper cover and an anti-overflow inner cover mounted on the upper cover, the anti-overflow inner cover comprising a drainage cover and an anti-overflow groove surrounding the drainage cover, the drainage cover being provided with a first drainage hole, characterized in that: The side of the bottom wall of the anti-overflow groove facing the upper cover includes a guide surface extending from top to bottom and a recessed portion connected to the lower end of the guide surface, so that the guide surface guides the liquid in the anti-overflow groove to flow toward the recessed portion, and the recessed portion is provided with a reflux hole penetrating the bottom wall of the anti-overflow groove.

2. The electric stew pot according to claim 1, characterized in that: The bottom wall of the anti-overflow groove has a circumferentially extending wave surface on the side facing the upper cover. The wave surface includes an upwardly arched wave crest and a downwardly sunken wave trough. The guide surface is arranged between the wave crest and the wave trough, and the recessed portion is arranged at the wave trough.

3. The electric stew pot according to claim 2, characterized in that: The bottom wall of the anti-overflow groove is a circumferentially extending wave structure.

4. The electric stew pot according to claim 1, characterized in that: There are two guide surfaces in an arc shape, the recessed portion is provided between the lower ends of the two guide surfaces, and the upper ends of the two guide surfaces are connected.

5. The electric stew pot according to claim 1, characterized in that: The bottom wall of the overflow prevention groove is further provided with a second drainage hole, and the second drainage hole is provided at the upper end of the guide surface or close to the upper end of the guide surface.

6. The electric stew pot according to claim 5, characterized in that: The aperture of the second drainage hole is larger than the aperture of the reflux hole.

7. The electric stew pot according to any one of claims 1 to 6, characterized in that: The drainage cover is a conical cover that gradually shrinks upward, and the first drainage hole is arranged near the top of the conical cover.

8. The electric stew pot according to any one of claims 1 to 6, characterized in that: At least some of the first drainage holes are arranged in radial correspondence with the return holes.

9. The electric stew pot according to any one of claims 1 to 6, characterized in that: The anti-overflow inner cover is sealed and connected to the upper cover to form a heat preservation chamber between the anti-overflow inner cover and the upper cover, and the first drainage hole and the reflux hole are both connected to the heat preservation chamber.

10. The electric stew pot according to any one of claims 1 to 6, characterized in that: The anti-overflow groove includes an inner wall, an outer wall and a bottom wall connected between the inner wall and the outer wall. The upper end of the inner wall is connected to the drainage cover, and the upper end of the outer wall is bent outward to form a flange. The flange and the upper cover are both pressed onto the top of the ceramic inner liner.

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