Pressure cooking utensil
By dividing the heating plate of the pressure cooker into smooth and rough areas and designing specific textures and rib structures, the problem of severe wear on the inner pot is solved, achieving efficient heating and heat dissipation while reducing processing difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-03-13
AI Technical Summary
In existing pressure cooking appliances, the difference in structural strength between the inner and outer sides of the heating plate leads to severe wear on the bottom edge of the inner pot and the outer area of the heating element. The coating on the bottom of the inner pot is prone to peeling off, and the processing cost is high and the heat dissipation effect is reduced.
The surface of the heating plate is divided into smooth and rough areas. The roughness of the smooth area is less than that of the rough area. Wear is reduced by the design of textures with different densities. Annular grooves and rib structures are set in the smooth area to enhance structural strength and heat transfer efficiency.
It effectively reduces wear on the bottom edge of the inner liner, extends service life, maintains high heating and heat dissipation efficiency, reduces processing costs, and improves the user experience.
Smart Images
Figure CN223987784U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of kitchen appliance technology, specifically relating to a pressure cooking appliance. Background Technology
[0002] The heating methods of existing pressure cooking appliances are generally divided into two types: heating plate heating and electromagnetic heating. For pressure cooking appliances that use heating plate heating, the inner pot is placed on the heating plate and directly contacts the heating plate to achieve contact heat transfer, so that the heat from the heating plate is transferred to the inner pot.
[0003] Heating plates are typically formed through casting, where the heating element and the plate body are cast together as a single unit. However, after casting, surface defects such as pinholes and pits may appear on the plate body. Therefore, regular machining grooves are usually machined into the plate body surface after casting to reduce surface defects and increase the surface area of the plate body, thereby increasing heat dissipation and thermal conductivity efficiency.
[0004] However, due to the inherent structural characteristics of the heating plate, the structural strength varies across different areas of the plate. Specifically, the heating element inside the plate is wound in a ring. The inner area of the plate is thicker and stronger than the outer area, i.e., the edge of the plate. When the inner liner is placed on the heating plate, the bottom edge of the inner liner presses against the outer area of the heating element, causing slight deformation. This results in a tighter contact between the bottom edge of the inner liner and the outer area of the heating element, leading to more severe wear. As the heating plate heats up, the plate deforms to some extent. Because the edge area is thinner, the deformation due to thermal expansion and contraction is relatively greater. This further exacerbates the wear between the bottom edge of the inner liner and the outer area of the heating element.
[0005] After a period of use, this can cause the coating at the bottom edge of the inner pot to peel off, a persistent problem for this type of product that has remained unresolved. Furthermore, in pressure cooking appliances, when the internal pressure of the inner pot increases, it exerts a downward force on the heating plate, further exacerbating wear between the bottom edge of the inner pot and the outer area of the heating element. While processing the entire surface of the pot into a smoother structure would inevitably increase manufacturing difficulty and costs significantly, and reduce the heat dissipation efficiency of the heating plate, the process becomes much more complex. Utility Model Content
[0006] This utility model provides a pressure cooking appliance to solve the problem that the different structural strengths of the inner and outer sides of the heating element of the heating plate lead to more severe wear on the bottom edge of the inner pot and the outer area of the heating element, making the coating on the bottom edge of the inner pot easy to peel off.
[0007] The technical solution adopted in this utility model is as follows:
[0008] A pressure cooking appliance includes a pot body with a accommodating cavity and an inner pot placed within the accommodating cavity. A heating plate is disposed at the bottom of the accommodating cavity, and the inner pot is placed on the heating plate. The heating plate includes a plate body and heating tubes embedded inside the plate body. The heating tubes are arranged in a ring. The upper surface of the plate body contacts the bottom wall of the inner pot to transfer heat to the inner pot. The upper surface of the plate body has a smooth area located outside the outer edge of the heating tube and a rough area located inside the outer edge of the heating tube. The roughness of the smooth area is less than the roughness of the rough area.
[0009] In this invention, the heating element is annularly embedded inside the plate. The upper surface of the plate is divided into a smooth area outside the heating element's outer edge and a rough area inside the heating element's outer edge, with the outer edge of the plate serving as the boundary. Since the inner liner is placed on the heating plate, the bottom edge of the inner liner contacts the smooth area more tightly, resulting in more severe wear, while the wear with the rough area is relatively less. Therefore, the roughness of the smooth area is made smaller than that of the rough area. Thus, without changing the overall structure of the heating plate, the smooth area is machined into a smoother structure than the rough area during subsequent plate surface processing. Even when the heating element is heating, the smooth area deforms to some extent due to heat, increasing the pressure between the bottom edge of the inner liner and the smooth area. Because the smooth area has lower roughness, it also reduces wear between it and the inner liner, thus protecting the coating on the bottom of the inner liner and greatly extending its service life. Furthermore, since the smooth area is located outside the heating element, more heat is transferred to the rough area, which also reduces the deformation caused by heat in the smooth area. The wear on the central area and rough areas at the bottom of the inner liner is relatively light, so there is no need to perform fine processing on the rough areas to make them relatively rough. Since the heating element is located within the rough area, this ensures efficient heating and heat dissipation in that region. By dividing the surface of the heating plate into regions and processing each region differently, resulting in varying roughness, this approach reduces wear on the inner liner while maintaining high heating efficiency, significantly improving the user experience.
[0010] The smooth area has a first texture, and the rough area has a second texture. The density of the first texture is greater than the density of the second texture.
[0011] In this design, both the rough and smooth areas are textured. The density of the first texture in the smooth area is greater than that of the second texture in the rough area. The higher the texture density, the lower the roughness and the smoother the disk surface. By machining textures of different densities in the smooth and rough areas, not only is the overall appearance quality of the disk guaranteed, but the roughness design requirements are also met, thereby achieving the effects of wear resistance and heat transfer.
[0012] The first texture includes a plurality of first annular grooves arranged radially at intervals along the disc body, wherein the distance between each first annular groove is the same; or, the distance between each first annular groove gradually decreases along the radial direction outward of the disc body.
[0013] In this solution, multiple first annular grooves are machined in a smooth area by turning. These multiple first annular grooves together form the first texture. The distance between each first annular groove is the same, which makes the turning process less difficult and eliminates the need for frequent adjustment of the tool head position. When using CNC equipment for machining, the program design is also simpler, thereby greatly improving machining efficiency and saving machining costs.
[0014] In another design, the distance between the first annular grooves gradually decreases radially outward from the disc body. The smaller the distance between the first annular grooves, the smoother the area, resulting in a gradual decrease in roughness of the smooth area radially outward, meaning the area further away from the center of the disc body is smoother. Since the disc body's structural strength is strong at the center and weak at the edges, the area further away from the center has weaker structural strength and is more prone to wear upon contact with the inner liner. Therefore, designing the roughness of the smooth area as a gradually smoothing structure from the innermost to the outermost edge further reduces wear with the bottom edge of the inner liner. This also makes the transition at the boundary between the first and second textures more uniform, thereby improving the appearance quality of the disc body surface.
[0015] The first texture includes a plurality of first annular grooves arranged radially at intervals along the disc body, and the second texture includes a plurality of second annular grooves arranged radially at intervals along the disc body. The density of the first annular grooves is greater than 30 grooves / cm, and the density of the second annular grooves is 15-25 grooves / cm.
[0016] In this design, the density of the first annular grooves in the first texture is relatively high, which reduces the frictional resistance between the smooth area and the bottom of the inner liner, preventing the inner liner coating from being scratched by the coarser texture of the heating plate. The density of the second annular grooves in the second texture is relatively low, effectively ensuring the surface heat dissipation area in this region. Meanwhile, the use of conventional coarser machining textures in the inner area, which does not affect the wear of the inner liner coating, results in higher machining efficiency and lower manufacturing costs.
[0017] The first texture includes a plurality of first annular grooves arranged radially at intervals along the disc body, and annular ribs located on both sides of the first annular grooves, with a contact arc surface or contact plane provided on the top of the annular ribs.
[0018] In this design, when the inner liner is placed on the heating plate, its bottom edge directly contacts the annular rib of the first texture. By designing the top of the annular rib to be a rounded or flat surface, the sharpness of the top of the annular rib can be reduced, making the contact with the inner liner softer. This increases the contact area between the annular rib and the inner liner to a certain extent, reduces the pressure, and further reduces the risk of the inner liner being scratched.
[0019] The smooth area has a first texture, and the rough area has a second texture. The depth of the first texture is less than the depth of the second texture.
[0020] In this design, the first texture is relatively shallow. Therefore, after the first texture is processed, a coating can be sprayed onto the surface of the smooth area. The coating can fill and cover the groove of the first texture to a large extent, making the surface of the smooth area more delicate and smooth, thereby reducing the frictional resistance between the smooth area and the outer wall of the inner liner.
[0021] The width of the smooth region in the radial direction of the disk is D, where D > 10 mm.
[0022] In this design, the width of the smooth area is greater than 10mm, thus ensuring the area of the smooth area. When the user places the inner liner, even if the inner liner and the heating plate are not placed completely in the center, there is still enough area at the bottom of the inner liner to contact the smooth area, thereby ensuring the anti-wear effect.
[0023] The lower side of the plate is provided with a mounting protrusion, and the heating element is embedded inside the mounting protrusion. The projection of the mounting protrusion toward the plate is located in a smooth area.
[0024] In this design, the heating element is embedded within a mounting protrusion, which protrudes from the plate body. Therefore, the mounting protrusion enhances the structural strength of localized areas of the plate body. Since the projection of the mounting protrusion onto a smooth area, it appropriately reinforces the structural strength of that smooth area, reducing its deformation under pressure from the inner liner and as its temperature rises, thus mitigating friction between the smooth area and the inner liner. Furthermore, because the heating element is located inside the mounting protrusion, the protrusion has a higher temperature, allowing it to transfer heat to the smooth area, increasing the heat in that area and ensuring effective heating of the bottom edge of the inner liner, resulting in more uniform heating between the center and edges of the inner liner.
[0025] The bottom wall of the inner liner is provided with a mating arc surface, and the upper surface of the plate is provided with a supporting arc surface that contacts the mating arc surface. The supporting arc surface extends from the rough area to the smooth area.
[0026] In this design, the supporting arc surface of the heating plate matches the mating arc surface of the bottom of the inner liner, ensuring complete contact between the bottom of the inner liner and the upper surface of the heating plate. This allows the heating plate to transfer heat to the entire bottom wall of the inner liner, resulting in more uniform heating of the central and edge areas. Simultaneously, the arc-shaped structure further disperses the force exerted by the inner liner on the heating plate, preventing stress concentration that could damage or deform the heating plate.
[0027] The heating plate is floatingly connected to the pot body, allowing it to move up and down under the influence of the inner pot.
[0028] In this design, because the inner pot moves downwards when pressure is applied, increasing the pressure on the heating plate, the heating plate is designed to float vertically. This reduces the pressure from the inner pot on the heating plate, decreasing wear and tear on both. Furthermore, it helps trigger the pressure switch at the bottom when the heating plate moves downwards. When the internal pressure of the inner pot exceeds a set value, the heating plate moves downwards by a significant amount, triggering the pressure switch and allowing the pressure cooking appliance to respond promptly. Attached Figure Description
[0029] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0030] Figure 1 This is a cross-sectional view of the pot body structure according to one embodiment of the present invention;
[0031] Figure 2 This is a cross-sectional view of the heating plate according to one embodiment of the present invention;
[0032] Figure 3 for Figure 2 A magnified view of area A in the middle;
[0033] Figure 4 This is a top view of the disc body according to one embodiment of the present utility model. The figure only shows the density of the first and second textures and does not represent the actual number of the first and second textures.
[0034] Figure 5 for Figure 4 A bottom view of the middle section.
[0035] in:
[0036] 1. Pot body; 11. Receiving cavity;
[0037] 2. Inner liner; 21. Fitting curved surface;
[0038] 3 Heating plate; 31 Plate body; 311 Smooth area; 312 Rough area; 313 First texture; 3131 First annular groove; 3132 Annular rib; 314 Second texture; 3141 Second annular groove; 32 Heating tube; 33 Opening; 34 Supporting arc surface; 35 Mounting protrusion; 36 Reinforcing rib. Detailed Implementation
[0039] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.
[0040] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.
[0041] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0043] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" 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 this 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.
[0044] like Figures 1 to 4 As shown, a pressure cooking appliance includes a pot body 1 with a accommodating cavity 11 and an inner pot 2 placed inside the accommodating cavity 11. A heating plate 3 is provided at the bottom of the accommodating cavity 11, and the inner pot 2 is placed on the heating plate 3. The heating plate 3 includes a plate body 31 and a heating tube 32 embedded inside the plate body 31. The heating tube 32 is arranged in a ring. The upper surface of the plate body 31 contacts the bottom wall of the inner pot 2 to transfer heat to the inner pot 2. The upper surface of the plate body 31 has a smooth region 311 located outside the outer edge of the heating tube 32 and a rough region 312 located inside the outer edge of the heating tube 32. The roughness of the smooth region 311 is less than the roughness of the rough region 312.
[0045] It should be noted that in this invention, the bottom of the inner liner 2 is in complete contact with the upper surface of the heating plate 3. That is, the inner liner 2 is in contact with both the rough area 312 and the smooth area 311, thereby ensuring that all areas of the heating plate 3 can transfer heat to the inner liner 2, guaranteeing the uniformity of heating of the inner liner 2. However, due to the structural characteristics of the heating plate 3, the wear between the central area of the bottom of the inner liner 2 and the central area of the heating plate 3 is relatively light, while the wear between the bottom edge of the inner liner 2 and the edge of the heating plate 3 is more severe.
[0046] Preferably, such as Figure 1 , Figure 2 As shown, the bottom wall of the inner liner 2 is provided with a mating arc surface 21, and the upper surface of the disc body 31 is provided with a supporting arc surface 34 that contacts the mating arc surface 21. The supporting arc surface 34 extends from the rough area 312 to the smooth area 311.
[0047] The supporting arc surface 34 on the upper surface of the heating plate 3 is adapted to the mating arc surface 21 on the bottom of the inner liner 2, so that the bottom of the inner liner 2 is in complete contact with the upper surface of the heating plate 3. This allows the heating plate 3 to transfer heat to the entire bottom wall of the inner liner 2, making the heating of the central and edge areas of the inner liner 2 more uniform. At the same time, the arc structure also makes the force exerted by the inner liner 2 on the heating plate 3 more dispersed, avoiding stress concentration on the heating plate 3 and preventing damage or deformation.
[0048] Meanwhile, the upper surface of the heating plate 3 is a smoothly transitioning arc structure, which makes the overall appearance and structure of the heating plate 3 more beautiful and easier to process, saving costs.
[0049] In this invention, the heating tube 32 is embedded in the plate 31 in a ring shape. The upper surface of the plate 31 is divided into a smooth area 311 located outside the outer edge of the heating tube 32 and a rough area 312 located inside the outer edge of the heating tube 32, with the outer edge of the heating tube 32 as the boundary. Since the inner liner 2 is placed on the heating plate 3, the bottom edge of the inner liner 2 is in closer contact with the smooth area 311 and the wear is more severe, while the wear with the rough area 312 is relatively lighter. Therefore, the roughness of the smooth area 311 is made smaller than that of the rough area 312. Thus, without changing the overall structure of the heating plate 3, the smooth area 311 is processed into a smoother structure than the rough area 312 during the subsequent processing of the plate surface of the plate body 31. Even when the heating tube 32 is heating, the smooth area 311 will deform to a certain extent due to heat, resulting in an increase in the compressive force between the edge area of the bottom of the inner liner 2 and the smooth area 311. Since the roughness of the smooth area 311 is smaller, it can also reduce the wear between it and the inner liner 2, thereby protecting the coating at the bottom of the inner liner 2 and greatly improving the service life of the inner liner 2.
[0050] Furthermore, since the smooth area 311 is located outside the heating tube 32, more of the heat from the heating tube 32 is transferred to the rough area 312, which can also reduce the deformation of the smooth area 311 caused by heating to a certain extent.
[0051] The wear on the bottom center area and rough area 312 of the inner liner 2 is relatively light, so there is no need to perform fine processing on the rough area 312 to make it relatively rough. Since the heating element 32 is located within the rough area, the heating and heat dissipation efficiency of that area can be guaranteed. By dividing the surface of the heating plate 31 into regions and processing different regions differently, the roughness of the two regions varies. This approach reduces wear on the inner liner 2 while maintaining high heating efficiency, greatly improving the user experience.
[0052] Preferably, such as Figure 5 As shown, the lower surface of the rough region 312 is provided with reinforcing ribs 36 to further improve the structural strength of the rough region 312. At the same time, the thickness of the rough region 312 is greater than the thickness of the smooth region 311.
[0053] It should be noted that this utility model does not limit the processing method for the roughness of the smooth region 311 and the rough region 312. In one embodiment, after the heating plate 3 is cast, the smooth region 311 can be polished to make its surface smoother, thereby reducing the roughness. Alternatively, a coating can be sprayed onto the smooth region 311 to make its surface smoother. The rough region 312 is not processed, or it can be machined with grooves according to existing technology, so that the roughness of the rough region 312 is greater than the roughness of the smooth region 311.
[0054] In a preferred embodiment, such as Figure 2 , Figure 4 As shown, the smooth area 311 is provided with a first texture 313, and the rough area 312 is provided with a second texture 314. The density of the first texture 313 is greater than the density of the second texture 314.
[0055] Both the rough region 312 and the smooth region 311 are provided with textured structures. The density of the first texture 313 in the smooth region 311 is greater than that of the second texture 314 in the rough region 312. The greater the texture density, the lower the roughness and the smoother the surface of the disk 31. By machining textures of different densities in the smooth region 311 and the rough region 312, not only is the overall appearance quality of the disk 31 guaranteed, but the roughness design requirements are also met, thereby achieving the effects of wear resistance and heat transfer.
[0056] In this embodiment, the structure and style of the first texture 313 and the second texture 314 are not limited. In a preferred embodiment, such as Figure 4 As shown, the first texture 313 and the second texture 314 are both annular textures, each annular texture is a concentric circle, and they are spaced outward from the center of the disc body 31.
[0057] In one embodiment of this implementation, such as Figure 3 As shown, the first texture 313 includes a plurality of first annular grooves 3131 arranged radially at intervals along the disc body 31, and the distance between each first annular groove 3131 is the same.
[0058] In this embodiment, multiple first annular grooves 3131 are machined in the smooth area 311 by turning. The multiple first annular grooves 3131 together form the first texture 313. The distance between each first annular groove 3131 is the same, which makes the turning process less difficult and eliminates the need to frequently adjust the position of the cutting head. When using CNC equipment for machining, the program design is also simpler, thereby greatly improving the machining efficiency and saving machining costs.
[0059] In another embodiment of this implementation, the distance between each of the first annular grooves 3131 gradually decreases along the radial direction outward of the disk body 31.
[0060] In this embodiment, the distance between each of the first annular grooves 3131 gradually decreases radially outward from the disc body 31. The smaller the distance between each of the first annular grooves 3131, the smoother the area. This results in the roughness of the smooth area 311 gradually decreasing radially outward, meaning the area further away from the center of the disc body 31 is smoother. Since the disc body 31 has a strong center and weak edges, the area further away from the center of the disc body 31 has weaker structural strength and is more prone to wear after contact with the inner liner 2. Therefore, designing the roughness within the smooth area 311 as a gradually smoothing structure from the innermost to the outermost part further reduces wear with the bottom edge of the inner liner 2. It also makes the transition at the boundary between the first texture 313 and the second texture 314 more uniform, thereby improving the appearance quality of the disc body 31 surface.
[0061] Specifically, such as Figure 3 As shown, the first texture 313 includes a plurality of first annular grooves 3131 arranged radially at intervals along the disc body 31, and the second texture 314 includes a plurality of second annular grooves 3141 arranged radially at intervals along the disc body 31. The density of the first annular grooves 3131 is greater than 30 grooves / cm, and the density of the second annular grooves 3141 is 15-25 grooves / cm. The higher density of the first annular grooves 3131 in the first texture 313 reduces the frictional resistance between the smooth area 311 and the bottom of the inner liner 2, preventing the coating of the inner liner 2 from being scratched by the coarser texture of the heating plate 3. The lower density of the second annular grooves 3141 in the second texture 314 effectively ensures the surface heat dissipation area of this region. At the same time, the use of conventional coarse machining textures in the inner area, which does not affect the wear of the coating of the inner liner 2, makes machining efficiency higher and reduces manufacturing costs.
[0062] Preferably, the density of the first annular groove 3131 is 40-55 grooves / cm. After processing, the surface roughness of the smooth area 311 is measured with a roughness tester. The measurement direction should be such that the movement direction of the roughness tester stylus passes through the center direction of the heating plate 3. Its Ra range is less than 3.5μ, and it is generally controlled to be 1.5-2.5μ for optimal performance. In addition, the density of the second annular groove 3141 in the rough area 312 is 15-25 grooves / cm. After spraying, its surface roughness Ra is greater than 3.5μ, and it is generally controlled to be 5-10μ for optimal performance.
[0063] Preferably, such as Figure 3 As shown, the first texture 313 includes a plurality of first annular grooves 3131 arranged radially at intervals along the disc body 31, and annular ribs 3132 located on both sides of the first annular grooves 3131. The top of the annular ribs 3132 is provided with a contact arc surface or a contact plane.
[0064] When the inner liner 2 is placed on the heating plate 3, its bottom edge is in direct contact with the annular rib 3132 of the first texture 313. By designing the top of the annular rib 3132 to be an arc surface or a flat surface, the sharpness of the top of the annular rib 3132 can be reduced, making the contact with the inner liner 2 more gentle. This increases the contact area between the annular rib 3132 and the inner liner 2 to a certain extent, reduces the pressure, and further reduces the risk of the inner liner 2 being scratched.
[0065] In another preferred embodiment, such as Figure 3 As shown, the smooth area 311 is provided with a first texture 313, and the rough area 312 is provided with a second texture 314. The depth of the first texture 313 is less than the depth of the second texture 314.
[0066] In this embodiment, the depth of the first texture 313 is relatively shallow. Therefore, after the first texture 313 is processed, a coating layer can be sprayed on the surface of the smooth area 311. The coating layer can fill and cover the groove of the first texture 313 to a large extent, making the surface of the smooth area 311 more delicate and smooth, thereby reducing the frictional resistance between the smooth area 311 and the outer wall of the inner liner 2.
[0067] It should be noted that the above-described embodiments can be implemented individually or in combination, for example, as follows: Figure 3 As shown, the density of the first texture 313 can be greater than the density of the second texture 314, and the depth of the first texture 313 is less than the depth of the second texture 314, thereby further reducing the roughness of the smooth area 311, making its surface smoother, and reducing wear with the inner liner 2.
[0068] It should be noted that in this utility model, the center of the disc body 31 is provided with an opening 33, and the rim of the opening 33 and the outer edge of the disc body 31 are provided with a flange structure. The texture structure is only provided on the upper surface of the disc body 31 (i.e. the surface in contact with the inner liner 2), while the flange and the lower surface of the disc body 31 are not provided with a texture structure, thereby improving processing efficiency and saving processing costs.
[0069] Preferably, such as Figure 2 As shown, the width of the smooth area 311 in the radial direction of the plate 31 is D, where D > 10 mm. The width of the smooth area 311 is greater than 10 mm, thus ensuring that the area of the smooth area 311 is sufficient to ensure that even if the inner liner 2 is not completely centered with the heating plate 3 when the user places the inner liner 2, there is still enough area at the bottom of the inner liner 2 to contact the smooth area 311, thereby ensuring the anti-wear effect.
[0070] As a preferred embodiment of this utility model, such as Figure 2As shown, a mounting protrusion 35 is provided on the lower side of the disk body 31, and the heating tube 32 is embedded inside the mounting protrusion 35. The projection of the mounting protrusion 35 toward the disk body 31 is located in the smooth area 311.
[0071] The heating element 32 is embedded in the mounting protrusion 35, which is a structure that protrudes downward from the lower surface of the plate 31. Therefore, the mounting protrusion 35 can improve the structural strength of a local area of the plate 31. The projection of the mounting protrusion 35 toward the plate 31 is located in the smooth area 311, which can appropriately strengthen the structural strength of the smooth area 311. This reduces the deformation of the smooth area 311 when it is pressed down by the inner liner 2 and when the temperature rises, thereby reducing the friction between it and the inner liner 2 to a certain extent.
[0072] In addition, since the heating element 32 is located inside the mounting protrusion 35, the mounting protrusion 35 has a higher temperature, which can also transfer heat to the smooth area 311, increasing the heat in the smooth area 311, thereby ensuring the heating effect on the bottom edge area of the inner liner 2, and making the center and edge of the inner liner 2 more evenly heated.
[0073] Preferably, the heating plate 3 is floatingly connected to the pot body 1 so that the heating plate 3 can float up and down under the action of the inner pot 2.
[0074] Because the inner pot 2 will move downwards when pressure is applied inside, thus increasing the pressure on the heating plate 3, the heating plate 3 is designed to float up and down. This design reduces the pressure on the heating plate 3 from the inner pot 2, thus reducing wear on both. Furthermore, it helps trigger the pressure switch at the bottom when the heating plate 3 moves downwards. This means that when the internal pressure of the inner pot 2 is higher than the set value, the heating plate 3 will move downwards by a larger amount, triggering the pressure switch at the bottom, thus helping the pressure cooking appliance to react promptly.
[0075] For any parts not mentioned in this utility model, existing technologies can be used or referenced.
[0076] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.
[0077] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A pressure cooking appliance, comprising a pot body having a receiving cavity and a inner container arranged in the receiving cavity, a heating disc being arranged at the bottom of the receiving cavity, and the inner container being arranged on the heating disc, characterized in that the heating disc comprises a disc body and a heating tube embedded in the disc body, the heating tube is arranged in a ring shape, the upper surface of the disc body is in contact with the bottom wall of the inner container to transfer heat to the inner container, the upper surface of the disc body has a smooth area outside the outer edge of the heating tube and a rough area inside the outer edge of the heating tube, and the roughness of the smooth area is less than the roughness of the rough area.
2. The pressure cooking appliance according to claim 1, characterized in that the first texture is arranged on the smooth area, and the second texture is arranged on the rough area, and the density of the first texture is greater than the density of the second texture.
3. The pressure cooking appliance according to claim 2, characterized in that the first texture comprises a plurality of first annular grooves arranged at intervals along the radial direction of the disc body, and the distance between each first annular groove is the same; or the distance between each first annular groove gradually decreases along the radial direction of the disc body.
4. The pressure cooking appliance according to claim 2, characterized in that the first texture comprises a plurality of first annular grooves arranged at intervals along the radial direction of the disc body, and the second texture comprises a plurality of second annular grooves arranged at intervals along the radial direction of the disc body, the density of the first annular grooves is greater than 30 grooves / cm, and the density of the second annular grooves is 15-25 grooves / cm.
5. The pressure cooking appliance according to claim 2, characterized in that the first texture comprises a plurality of first annular grooves arranged at intervals along the radial direction of the disc body, and annular convex ribs are arranged on both sides of the first annular grooves, and the top of the annular convex ribs is provided with a contact arc surface or a contact flat surface.
6. The pressure cooking appliance according to claim 1 or 2, characterized in that the first texture is arranged on the smooth area, and the second texture is arranged on the rough area, and the depth of the first texture is less than the depth of the second texture.
7. The pressure cooking appliance according to claim 1, characterized in that the width of the smooth area in the radial direction of the disc body is D, and D>10mm.
8. The pressure cooking appliance according to claim 1, characterized in that the lower side of the disc body is provided with a mounting protrusion, the heating tube is embedded in the mounting protrusion, and the projection of the mounting protrusion towards the disc body is located in the smooth area.
9. The pressure cooking appliance according to claim 1, characterized in that the bottom wall of the inner container is provided with a matching arc surface, the upper surface of the disc body is provided with a supporting arc surface in contact with the matching arc surface, and the supporting arc surface extends from the rough area to the smooth area.
10. The pressure cooking appliance according to claim 1, characterized in that the heating disc is floatingly connected to the pot body, so that the heating disc can float up and down under the action of the inner container.