PTC heater and waterproof electric stewpot

Abstract

The utility model discloses a PTC heater, which comprises PTC heating cores and a heat conduction shell used for packaging the PTC heating cores, the heat conduction shell comprises a bending section and at least two straight line sections, the bending section is connected between at least part of two adjacent straight line sections, one PTC heating core is packaged in each straight line section, two adjacent PTC heating cores are arranged at intervals, a gap is formed between the two adjacent PTC heating cores, and the heat conduction shell is connected with the bending section. And the bending section is arranged corresponding to the gap. According to the PTC heater disclosed by the utility model, the contact area between the PTC and water can be effectively increased by changing the PTC structure, so that the heating efficiency of the PTC is improved, and the cooking time of the waterproof electric stewpot is shortened. In addition, the utility model further discloses a waterproof electric stewpot which comprises a pot body and a stew cup, the pot body comprises a water container with a water containing cavity formed inside, the water container is provided with a container bottom wall and a container side wall, the container bottom wall is provided with a peripheral edge area close to the container side wall, the stew cup is located in the water containing cavity, and the PTC heater is arranged on the container bottom wall. And the PTC heater is arranged in the peripheral edge area.

Description

[Technical Field]

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a PTC heater and a water-cooled electric slow cooker. [Background Technology]

[0002] Existing PTC heaters, including a PTC heating element and a heat-conducting shell for encapsulating the PTC heating element, are limited by current extrusion molding manufacturing processes, which can only produce a one-piece, straight heat-conducting shell. This means that existing PTC heaters are generally rectangular strips. Because PTC heaters heat up rapidly and their material resistance increases with temperature, achieving automatic temperature control after thermal equilibrium, they are suitable for scenarios requiring long cooking times. Therefore, existing double-boiler electric slow cookers use PTC heaters to directly heat water, making the entire cooking process safer and more reliable.

[0003] Existing electric slow cookers include a pot body and a stewing pot. The pot body includes a water-holding container with an internal water-filled cavity. The stewing pot is located inside the water-filled cavity. The water-filled container has a bottom wall and a side wall. The bottom wall of the container is equipped with a PTC heater that directly heats the water in the water-filled cavity. In order to keep the bubbles generated after the water boils as far away from the bottom wall of the stewing pot as possible, and to avoid the problem that the bottom wall of the stewing pot hinders the rapid rise of bubbles, which would cause small bubbles to gather into large bubbles, resulting in violent surging of the liquid surface and easy generation of loud noise, the existing PTC heater is located in the space between the projection of the stewing pot's bottom wall onto the bottom wall of the container and the side wall of the container. This space is roughly a rectangular ring structure with rounded corners. Since the PTC heater is rectangular strip in shape, it can only extend along one side of the bottom wall of the container, resulting in a limited heating range and slow heating time.

[0004] Because PTC heaters have thermal equilibrium characteristics, heating efficiency cannot be improved by increasing heating power. The only way to increase the heating efficiency is to increase the area of ​​the PTC heater. Since the PTC heater is currently only installed on one side, the only option is to extend the PTC heater along one side of the bottom wall of the container and maximize its length. However, the increase in the area of ​​the PTC heater is limited, which means the increase in heating efficiency is also limited. Therefore, the cooking time remains relatively long. [Utility Model Content]

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a PTC heater and a water-cooled electric slow cooker. By changing the PTC structure, the contact area between PTC and water can be effectively increased, thereby improving the heating efficiency of PTC and reducing the cooking time of the water-cooled electric slow cooker.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A PTC heater includes a PTC heating core and a heat-conducting shell for encapsulating the PTC heating core. The heat-conducting shell includes a bent section and at least two straight sections. The bent section is connected between at least some of the two adjacent straight sections. Each straight section encapsulates one PTC heating core. Adjacent PTC heating cores are spaced apart and form a gap. The bent section is arranged corresponding to the gap.

[0008] In the above-mentioned PTC heater, the heat-conducting shell is formed by bending a straight hollow tube, and the PTC heating core is pre-inserted into the straight hollow tube.

[0009] In the aforementioned PTC heater, the heat-conducting shell includes a lower cover and an upper cover that are separately machined, and the upper cover and the lower cover cooperate to encapsulate the PTC heating core.

[0010] In the above-mentioned PTC heater, the heat-conducting shell is an aluminum shell.

[0011] This utility model also provides a water-insulated electric slow cooker, including a pot body and a stewing pot. The pot body includes a water-holding container with an internal water-holding cavity. The water-holding container has a bottom wall and a side wall. The bottom wall has a peripheral edge area near the side wall. The stewing pot is located inside the water-holding cavity. The bottom wall of the container is provided with a PTC heater as described in any of the above technical solutions. The PTC heater is located in the peripheral edge area.

[0012] In the above-mentioned water-insulated electric slow cooker, the PTC heater includes three straight segments and a bent segment connecting two adjacent straight segments. The three straight segments extend along the three sides of the bottom wall of the container, and the bent segment corresponds to the corner of the peripheral edge area.

[0013] Alternatively, the PTC heater includes two straight segments and a bent segment connecting the two straight segments, the two straight segments extending along two adjacent sides of the bottom wall of the container, and the bent segment corresponding to a corner within the peripheral edge area.

[0014] In the above-mentioned electric slow cooker, the pot body also includes an outer shell and an operation panel installed on the front side of the outer shell. The outer shell surrounds the outside of the water container, and the bent section corresponds to the corner part on the rear side of the peripheral edge area.

[0015] In the above-mentioned electric slow cooker, the bottom wall of the container is provided with a heating trough, and the PTC heater constitutes the bottom wall of the heating trough. The bottom wall of the heating trough is lower than the upper surface of the bottom wall of the container.

[0016] In the above-mentioned water-cooled electric slow cooker, a sealing ring is provided between the PTC heater and the side wall of the heating tank.

[0017] In the above-mentioned double boiler, the double boiler also includes a pressure plate with heat dissipation holes, and the PTC heater is fixed to the bottom wall of the water container by the pressure plate.

[0018] The beneficial effects of this utility model are:

[0019] 1. The heat-conducting shell of this utility model includes a bent section and at least two straight sections. At least some adjacent straight sections are connected by a bent section. Each straight section encapsulates a PTC heating core. Adjacent PTC heating cores are spaced apart, forming a gap. The bent sections are positioned corresponding to the gaps. This design allows the PTC heater to be installed in non-linear installation areas. Furthermore, when the PTC heater is working, the heating of the PTC heating cores heats the straight sections, enabling them to heat the water. The heat-conducting shell's thermal conductivity allows the heat from the straight sections to be transferred to adjacent bent sections, which then heat the water. Compared to existing technologies that rely on multiple independently arranged straight sections (i.e., multiple independently arranged rectangular strips of PTC) for heating, this technology increases the heating area of ​​the entire PTC heater by adding bent sections, thus increasing the contact area between the PTC heater and the water, thereby improving the heating efficiency of the PTC. Finally, the corresponding gaps between the bent sections prevent interference between the PTC heating cores and the bent sections, facilitating the manufacturing of the PTC heater.

[0020] 2. The heat-conducting shell is formed by bending a straight hollow tube, and the PTC heating core is pre-inserted into the straight hollow tube. This design allows for the pre-processing of straight hollow tubes, followed by the sequential insertion of multiple PTC heating cores into the straight hollow tubes. Since there is a gap between adjacent PTC heating cores, the corresponding gaps can be bent as needed to form a bent section. The processing is simple and convenient, and the manufacturability is strong.

[0021] 3. The heat-conducting shell includes a separately machined lower cover and an upper cover, which work together to encapsulate the PTC heating core. This design allows the PTC heating core to be pre-installed in the lower cover and / or upper cover, and then the heat-conducting shell is assembled by closing the lower cover or upper cover, thus encapsulating the PTC heating core. Compared to the plug-in assembly method, this reduces the difficulty of assembling the PTC heating core and the heat-conducting shell.

[0022] 4. The heat-conducting shell is made of aluminum. This design leverages the advantages of aluminum, such as good thermal conductivity, strong corrosion resistance, low cost, light weight, and ease of construction. Using an aluminum shell as the heat-conducting shell improves its thermal conductivity, reduces material costs and weight, facilitates processing and forming, and also enhances its corrosion resistance.

[0023] 5. Place the PTC heater on the double boiler, specifically on the periphery of the bottom wall of the container, near the side wall. The straight section can extend along the straight edge of the periphery, while the bent section corresponds to the corner of the periphery. Since the periphery is far from the bottom wall of the pot, placing the PTC heater there minimizes obstruction from the bottom wall. This ensures that after the PTC heater heats and boils the water, the generated bubbles will be as far away from the bottom wall as possible, preventing the bottom wall from hindering the bubbles from rising quickly. This allows the bubbles to rise rapidly to the surface and escape through the vent on the lid, preventing the bottom wall from obstructing the rapid rise of bubbles and causing small bubbles to coalesce into large bubbles, resulting in violent surging of the liquid and excessive noise.

[0024] 6. The pot body also includes an outer shell and an operation panel mounted on the front of the outer shell. The outer shell surrounds the outside of the water container, with the bent section corresponding to the corner of the rear side of the peripheral edge area. This design, by positioning the PTC heater away from the operation panel, causes the generated bubbles to move further away from the panel, increasing the distance noise travels to the user and thus reducing the user's perceived noise during operation, improving the user experience.

[0025] 7. The container has a heating trough at the bottom, with the PTC heater forming the bottom wall of the heating trough. The bottom wall of the heating trough is lower than the upper surface of the container's bottom wall. This design makes it the lowest point of the water-holding container. Therefore, during normal cooking, regardless of the amount of water, it ensures that water in the container flows into the heating trough, guaranteeing that there is always water in the heating trough and reducing the risk of the PTC heater burning dry.

[0026] 8. A sealing ring is installed between the PTC heater and the side wall of the heating trough. This design prevents water leakage at the heating trough.

[0027] 9. The double boiler also includes a pressure plate with heat dissipation holes. The PTC heater is fixed to the bottom wall of the water container via the pressure plate. The pressure plate has heat dissipation holes to facilitate heat dissipation of the PTC heater, thus preventing the water container and pressure plate from burning and melting due to excessive temperature, thereby avoiding sealing failure and leakage. Finally, fixing the PTC heater to the bottom wall of the water container via the pressure plate also simplifies the assembly and disassembly of the PTC heater.

[0028] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] Figure 1This is a schematic diagram of the PTC heater in Embodiment 1 of this utility model;

[0031] Figure 2 This is a front view of the PTC heater in Embodiment 1 of this utility model;

[0032] Figure 3 This is a schematic diagram of the water-cooled electric slow cooker in Embodiment 2 of this utility model;

[0033] Figure 4 This is a front view of the electric slow cooker in Embodiment 2 of this utility model, with the stewing pot and lid removed.

[0034] Figure 5 This is a partial structural explosion diagram of the electric slow cooker in the inverted state in Embodiment 2 of this utility model;

[0035] Figure 6 for Figure 5 Assembly diagram.

[0036] Figure label:

[0037] 100, PTC heating element; 200, heat-conducting shell; 210, bent section; 220, straight section; 300, gap; 400, pot body; 410, water container; 411, container bottom wall; 4110, peripheral edge area; 4111, heating groove; 4112, screw post; 412, container side wall; 420, outer shell; 430, control panel; 500, pot lid; 600, stewing pot; 610, first area; 700, sealing ring; 800, pressure plate; 810, heat dissipation hole; 820, screw hole.

Detailed Implementation Methods

[0038] This utility model provides a PTC heater, including a PTC heating core and a heat-conducting shell for encapsulating the PTC heating core. The heat-conducting shell includes a bent section and at least two straight sections. The bent section is connected between at least some of the two adjacent straight sections. Each straight section encapsulates one PTC heating core. Adjacent PTC heating cores are spaced apart and form a gap. The bent section is arranged corresponding to the gap.

[0039] The heat-conducting shell of this invention includes a bent section and at least two straight sections. At least some adjacent straight sections are connected by a bent section. Each straight section encapsulates a PTC heating core. Adjacent PTC heating cores are spaced apart, forming a gap. The bent sections are positioned corresponding to these gaps. This design allows the PTC heater to be installed in non-linear installation areas. Furthermore, when the PTC heater is working, the heating of the straight sections by the PTC heating cores allows the straight sections to heat the water. The heat-conducting shell's thermal conductivity also allows the heat from the straight sections to be transferred to adjacent bent sections, which then heat the water. Compared to existing technologies that rely on multiple independently arranged straight sections (i.e., multiple independently arranged rectangular strips of PTC) for heating, this technology increases the heating area of ​​the entire PTC heater by adding bent sections, thus increasing the contact area between the PTC heater and the water and improving the heating efficiency of the PTC. Finally, the corresponding gaps between the bent sections prevent interference between the PTC heating cores and the bent sections, facilitating the manufacturing of the PTC heater.

[0040] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this utility model. In addition, it should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationship, are only based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] Example 1

[0042] like Figures 1 to 2As shown, the PTC heater in this embodiment includes a PTC heating core 100 and a heat-conducting shell 200. The PTC heating core 100 is encapsulated in the heat-conducting shell 200. The heat-conducting shell 200 includes a bent section 210 and at least two straight sections 220. At least some of the two adjacent straight sections 220 are connected by a bent section 210. Each straight section 220 encapsulates a PTC heating core 100. Two adjacent PTC heating cores 100 are spaced apart and form a gap 300. The bent section 210 is set corresponding to the gap 300. The straight segment 220 can still be smoothly installed with existing PTC heating elements. Furthermore, due to the presence of the bend 210, the two straight segments 220 extend in different directions, allowing PTC heating elements 100 to be installed on straight segments 220 in different directions. Therefore, the overall heating power of the PTC heater is not limited by the spatial dimensions of a single straight segment 220. Thus, the PTC heater can be installed in non-linear installation areas (i.e., curved installation areas, such as L-shaped, U-shaped, and ring-shaped installation areas). In addition, when the PTC heater is working, the heating of the straight segment 220 by the PTC heating element 100 can heat the straight segment 220, thereby increasing its heating efficiency. The PTC heater heats water by means of the heat-conducting shell 200, which in turn allows the heat from the straight section 220 to be transferred to the adjacent bent section 210. The water is then heated through the bent section 210. Compared to existing technologies that rely on multiple independently arranged straight sections (i.e., multiple independently arranged rectangular strip PTCs) for heating, this technology increases the heating area of ​​the entire PTC heater by adding the bent section 210, thus increasing the contact area between the PTC heater and the water and improving the heating efficiency of the PTC. Finally, the gap 300 between the bent section 210 and the bent section 210 avoids interference between the PTC heating core 100 and the bent section 210, facilitating the manufacturing of the PTC heater.

[0043] Specifically, in this embodiment, the heat-conducting shell 200 is formed by bending a straight hollow tube. The straight hollow tube is integrally formed by extrusion molding. Before bending, multiple PTC heating cores 100 are pre-inserted into the straight hollow tube. Since there is a gap 300 between two adjacent PTC heating cores 100, the part corresponding to the gap 300 can be bent as needed to form a bent section 210. The processing is simple and convenient, and the manufacturability is strong.

[0044] It should be noted that, depending on the shape of the installation area, some gaps can be bent to form bent sections; or all gaps can be bent to form bent sections.

[0045] Preferably, the heat-conducting shell in this embodiment is an aluminum shell. This design leverages the advantages of aluminum, such as good thermal conductivity, strong corrosion resistance, low cost, light weight, and ease of construction. Therefore, using an aluminum tube as the heat-conducting pipe improves the thermal conductivity of the heat-conducting shell, reduces its material cost and weight, facilitates its processing and forming, and also enhances its corrosion resistance.

[0046] It is understood that in other embodiments of this utility model, the heat pipe may also be a stainless steel pipe.

[0047] It is understood that in other embodiments of this utility model, the heat-conducting shell includes a lower cover and an upper cover that are separately machined, and the upper cover and the lower cover are sealed together to encapsulate the PTC heating core. This design allows the PTC heating core to be pre-installed in the lower cover and / or the upper cover, and then the heat-conducting shell is assembled by closing the lower cover or the upper cover, thus encapsulating the PTC heating core. Compared to the plug-in assembly of the PTC heating core, this reduces the difficulty of assembling the PTC heating core and the heat-conducting shell.

[0048] Example 2

[0049] like Figures 3 to 6As shown, this embodiment also provides a water-filled electric slow cooker, including a pot body 400, a pot lid 500, and a stewing pot 600. The pot body 400 includes a water container 410 with an internal water-filling cavity, which contains water. The water container 410 has a bottom wall 411 and a side wall 412. The bottom wall 411 has a peripheral edge area 4110 near the side wall 412. The stewing pot 600 is located inside the water-filling cavity, and the bottom wall 411 is provided with a PTC heater as described in Embodiment 1. The water is directly heated by the PTC heater, which can achieve uniform heating of the stewing pot 600 by the water. The PTC heater is placed on the electric slow cooker, specifically within the peripheral edge area 4110 of the container's bottom wall 411 near the side wall 412. Since the existing container bottom wall 411 has a rounded corner-like rectangular structure, the peripheral edge area 4110 is a rounded corner-like rectangular ring. The straight segment 220 can extend along the straight edge of the peripheral edge area 4110, while the bent segment 210 corresponds to the corner of the peripheral edge area 4110. Because the peripheral edge area 4110 is far from the bottom wall of the stew pot 600, placing the PTC heater in the peripheral edge area 4110 minimizes the obstruction of the stew pot's bottom wall by the PTC heater. This ensures that the PTC heater... After the C heater heats and boils the water in the water chamber, the generated bubbles will be kept as far away from the bottom wall of the stew pot as possible. This prevents the bottom wall of the stew pot from hindering the rapid rise of the bubbles, allowing them to quickly rise to the surface of the liquid and be released in time through the vent of the lid. This avoids the problem of small bubbles accumulating into large bubbles and causing violent surging of the liquid surface, which can easily generate a lot of noise, due to the bottom wall of the stew pot hindering the rapid rise of the bubbles. In addition, by using the PTC heater in Embodiment 1, the heating area of ​​the entire PTC heater can be increased, that is, the contact area between the PTC heater and the water can be increased, thereby improving the heating efficiency of the PTC heater and reducing the cooking time of the electric slow cooker.

[0050] In this embodiment, the projection area of ​​the bottom wall of the stewing pot onto the bottom wall 411 of the container is the first region 610. The peripheral edge region 4110 does not overlap with the first region 610 to prevent bubbles from being obstructed from rising by the bottom wall of the stewing pot and accumulating into large bubbles, causing violent surging of the liquid surface. However, since the actual distance between the first region 610 and the side wall 412 of the container is limited, and considering the radial width of the PTC heater, there will actually be an overlap between the peripheral edge region 4110 and the edge of the first region 610. That is, part of the PTC heater in the peripheral edge region 4110 is located at the edge of the first region 610, resulting in obstruction in the orthogonal projection direction. This design can also achieve noise reduction, but the noise reduction effect is worse than the scheme where the peripheral edge region 4110 does not overlap with the first region 610.

[0051] The PTC heater in this embodiment includes three straight segments 220 and a bent segment 210 connecting two adjacent straight segments 220. There are two bent segments 210. The three straight segments 220 extend along the three sides of the bottom wall 411 of the container, and the bent segments 210 correspond to the corners of the peripheral edge area 4110, that is, the PTC heater is U-shaped. Preferably, the pot body 400 also includes an outer shell 420 and an operation panel 430 installed on the front side of the outer shell 420. The outer shell 420 surrounds the outside of the water container 410, and the two bent sections 210 are respectively set at the two corners on the rear side of the peripheral edge area 4110. This design can avoid the PTC heater being placed close to the operation panel 430, and even if the PTC heater is placed away from the operation panel 430, the generated bubbles will be far away from the operation panel 430. Since the user is located in front of the operation panel 430, this design can increase the propagation distance of noise to the user, thereby reducing the user's perception of noise during operation and improving the user experience. In addition, it can also maximize the heating area of ​​the PTC heater to improve the heating efficiency of the PTC heater.

[0052] To fix the PTC heater to the bottom wall 411 of the container, in this embodiment, the bottom wall 411 of the container is provided with a heating recess 4111. The PTC heater forms the bottom wall of the heating recess 4111, and the bottom wall of the heating recess 4111 is lower than the upper surface of the bottom wall 411 of the container. This design makes it the lowest point of the water-holding container. Therefore, during normal cooking, regardless of the amount of water, it can be ensured that water in the water-holding container can flow into the heating recess 4111, so that there is always water in the heating recess 4111, reducing the risk of dry burning of the PTC heater. In addition, a sealing ring 700 is provided between the PTC heater and the side wall of the heating recess 4111. The sealing ring 700 is made of silicone, which can withstand high temperatures without failing to seal. By sealing the gap between the PTC heater and the side wall of the heating recess 4111 by the sealing ring 700, water leakage at the heating recess 4111 can be prevented.

[0053] Finally, in order to fix the PTC heater at the heating sink 4111, the electric slow cooker in this embodiment also includes a pressure plate 800 with multiple heat dissipation holes 810. The outer side of the bottom wall of the container is provided with screw posts 4112, and the pressure plate 800 is provided with screw holes 820. Screws pass through the screw holes 820 and lock with the screw posts 4112 to fix the pressure plate 800 to the outside of the bottom wall of the container. The PTC heater is fixed to the bottom wall of the water container by the pressure plate 800, which simplifies the disassembly and assembly of the PTC heater. In addition, the heat dissipation holes 810 on the pressure plate 800 can facilitate the heat dissipation of the PTC heater, so as to avoid the problem of the water container 410 and the pressure plate 800 burning and melting due to excessive temperature, thereby avoiding the problem of sealing failure and even water leakage.

[0054] It is understood that in other embodiments of this utility model, the PTC heater includes two straight segments and a bent segment connecting the two straight segments. The two straight segments extend along two adjacent sides of the bottom wall of the container, and the bent segment corresponds to one of the corner portions on the rear side of the peripheral edge area.

[0055] It is understood that in other embodiments of this utility model, the PTC heater includes four straight segments and a bent segment connecting two adjacent straight segments. The four straight segments extend along the four sides of the bottom wall of the container, and the four bent segments correspond to the four corners of the peripheral edge area, thereby further increasing the heating area of ​​the PTC heater and improving the heating efficiency of the PTC heater.

[0056] It is understood that in other embodiments of this utility model, if the bottom wall of the water container is circular, the peripheral edge area forms an annular shape. In this case, a PTC heater with bent sections and multiple straight sections can still be matched in the annular peripheral edge area. Of course, a PTC heater with bent sections and multiple straight sections can also be matched with peripheral edge areas of other shapes, such as elliptical annular or polygonal annular shapes.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A PTC heater, comprising a PTC heating core and a heat-conducting shell for encapsulating the PTC heating core, characterized in that, The heat-conducting shell includes a bent section and at least two straight sections. The bent section is connected between at least some of the two adjacent straight sections. Each straight section encapsulates a PTC heating core. Adjacent PTC heating cores are spaced apart and form a gap. The bent section is arranged corresponding to the gap.

2. A PTC heater as described in claim 1, characterized in that, The heat-conducting shell is formed by bending a straight hollow tube, and the PTC heating core is pre-inserted into the straight hollow tube.

3. A PTC heater as described in claim 1, characterized in that, The heat-conducting shell includes a lower cover and an upper cover that are machined separately, and the upper cover and the lower cover cooperate to encapsulate the PTC heating core.

4. A PTC heater as described in claim 1, characterized in that, The heat-conducting shell is an aluminum shell.

5. A double-boiler electric slow cooker, comprising a pot body and a stewing pot, wherein the pot body includes a water container forming a water-holding cavity inside, the water-holding container having a bottom wall and a side wall, the bottom wall having a peripheral edge region near the side wall, and the stewing pot being located within the water-holding cavity, characterized in that, The bottom wall of the container is provided with a PTC heater as described in any one of claims 1 to 4, wherein the PTC heater is located within the peripheral edge region.

6. The electric slow cooker as described in claim 5, characterized in that, The PTC heater includes three straight segments and a bent segment connecting two adjacent straight segments. The three straight segments extend along the three sides of the bottom wall of the container, and the bent segment corresponds to the corner portion in the peripheral edge area. Alternatively, the PTC heater includes two straight segments and a bent segment connecting the two straight segments, the two straight segments extending along two adjacent sides of the bottom wall of the container, and the bent segment corresponding to the corner of the peripheral edge area.

7. A double boiler as described in claim 6, characterized in that, The pot body also includes an outer shell and an operation panel installed on the front side of the outer shell. The outer shell surrounds the outside of the water container, and the bent section corresponds to the corner part on the rear side of the peripheral edge area.

8. A double boiler as described in claim 5, characterized in that, The container bottom wall is provided with a heating sink, and the PTC heater forms the bottom wall of the heating sink. The bottom wall of the heating sink is lower than the upper surface of the container bottom wall.

9. A double boiler electric slow cooker as described in claim 8, characterized in that, A sealing ring is provided between the PTC heater and the side wall of the heating tank.

10. A double boiler electric slow cooker as described in claim 5, characterized in that, The electric slow cooker also includes a pressure plate with heat dissipation holes, and the PTC heater is fixed to the bottom wall of the water container by the pressure plate.

Images