CN221330913U - Electric heating pot - Google Patents

Abstract

The utility model provides an electric heating pot, which relates to the technical field of cooking, and comprises a heating plate and a pot body, wherein an annular bulge is convexly arranged at the top of the heating plate, when the heating plate is not heated, the top surface of the annular bulge is used for being in contact with the bottom of the pot body, and other parts of the top surface of the annular bulge are arranged at intervals with the pot body. When the dish that generates heat is heated, the annular bulge at dish top will form the heat accumulation effect that generates heat, and the temperature of annular bulge top surface can be higher than the temperature of the other position tops of dish that generates heat, and then makes the annular bulge not take place to warp upwards with the part of pot body bottom surface contact before being heated, can make this annular bulge finally with the pot body bottom surface area of contact be greater than the current annular bulge generate heat back with the actual area of contact of pot body bottom surface, the pot body can receive better heating effect.

Description

Electric heating pot

Technical Field

The utility model relates to the technical field of cooking equipment, in particular to an electric heating pot.

Background

Some electric heating cookers in the current market are split cookers, which comprise a cooker body and a host, wherein the host comprises a host base and a heating plate arranged on the host base, and the cooker body can be placed on the heating plate for heating or taken away from the heating plate. Wherein, in order to guarantee that the pot body can not excessively be heated, the top of current dish that generates heat is protruding to be provided with generally, by the bottom of the annular protruding direct contact pot body to prevent that the pot body from generating heat the comprehensive contact of dish top and leading to excessively to be heated, also avoid the pot body or the burnt phenomenon of food to appear because of being heated seriously in pot body bottom center easily. However, in practical application, the contact area between the annular protrusion and the bottom of the pan body becomes small due to thermal deformation, so that the heat transfer efficiency is low, and the expected heating effect cannot be achieved.

Disclosure of utility model

The utility model aims to improve the heating effect of a heating plate on a pot body.

In order to solve the problems, the utility model provides an electric heating pot, which comprises a heating plate and a pot body, wherein an annular bulge is convexly arranged at the top of the heating plate, when the heating plate is not heated, the part of the top surface of the annular bulge is used for being contacted with the bottom of the pot body, and other parts of the top surface of the annular bulge are arranged at intervals with the pot body.

Compared with the prior art, the electric heating pot provided by the utility model has the following technical effects:

The annular bulge of this dish that generates heat is different with current annular bulge includes: when the heating plate is not heated, namely when the electric heating pot is powered off, the top surface of the annular protrusion is not completely contacted with the bottom surface of the pot body, but only the partial top surface of the annular protrusion is contacted with the bottom surface of the pot body, so when the heating plate is heated, namely when the electric heating pot is powered on, the annular protrusion at the top of the heating plate can form a heat accumulation effect, the temperature of the top surface of the annular protrusion can be higher than the temperature of the top surfaces at other positions of the heating plate, and then the part of the annular protrusion, which is not contacted with the bottom surface of the pot body, is deformed upwards before heating, so that the contact area between the annular protrusion and the bottom surface of the pot body is larger than the actual contact area between the annular protrusion and the bottom surface of the pot body after heating, and the pot body can be heated better.

Further, when the heating plate is not heated, the middle position between the inner ring and the outer ring of the top surface of the annular bulge is contacted with the bottom of the pot body; the distance between the top surface of the annular bulge and the bottom of the pot body is gradually increased along the direction from the middle position of the top surface of the annular bulge to the outer ring, and the distance between the top surface of the annular bulge and the bottom of the pot body is gradually increased along the direction from the middle position of the top surface of the annular bulge to the inner ring.

Further, the electric heating cooker further comprises a heating tube, a bottom ring is arranged at the bottom of the heating plate in a protruding mode, the bottom ring is located below the annular protrusion, at least part of the heating tube is embedded in the bottom ring, and the heating tube is used for radiating heat upwards.

Further, the projection of the heating tube on the horizontal plane is made to be a first projection, the projection of the top surface of the annular bulge on the horizontal plane is made to be a second projection, and at least part of the first projection is located at the central position between the inner ring and the outer ring of the second projection.

Further, the minimum distance from the heating tube to the top surface of the annular protrusion is greater than 3.5mm, and/or the vertical distance from the top surface of the annular protrusion to the top surface of the heating plate where the annular protrusion is not arranged is in the range of 0.4mm-0.5mm.

Further, the bottom surface of the pot body is concaved upwards to form an upward concave cambered surface, the top surface of the heating plate comprises an upward convex cambered surface, the annular bulge is arranged on the upward convex cambered surface in a protruding mode, and the top surface of the annular bulge is used for being in contact with the upward concave cambered surface.

Further, the concave cambered surface is a first ellipsoidal cambered surface, the radius of the first ellipsoidal cambered surface in the first direction is a first long axis radius, the radius of the first ellipsoidal cambered surface in the second direction is a first short axis radius, the ratio of the first long axis radius to the first short axis radius is greater than 2, the first direction is parallel to the long axis direction of the ellipsoid where the first ellipsoidal cambered surface is located, and the second direction is parallel to the short axis direction of the ellipsoid where the first ellipsoidal cambered surface is located.

Further, the top surface of the annular protrusion is a second ellipsoidal cambered surface, the radius of the second ellipsoidal cambered surface in a third direction is a second long axis radius, the radius of the second ellipsoidal cambered surface in a fourth direction is a second short axis radius, the third direction is parallel to the long axis direction of the ellipsoid where the second ellipsoidal cambered surface is located, the fourth direction is parallel to the short axis direction of the ellipsoid where the first ellipsoidal cambered surface is located, and the difference value between the first long axis radius and the first short axis radius is smaller than the difference value between the second long axis radius and the second short axis radius.

Further, the part of the upward convex cambered surface, which is not provided with the annular bulge, is a third ellipsoidal cambered surface, a concave groove is concavely formed in the central position of the third ellipsoidal cambered surface, and the height of the bottom surface of the concave groove is lower than that of the top surface of the annular bulge.

Further, the inner ring of the top surface of the annular bulge is connected with the bottom surface of the concave groove through a first transitional cambered surface, and the outer ring of the top surface of the annular bulge is connected with the position, where the annular bulge and the concave groove are not arranged, of the third ellipsoidal cambered surface through a second transitional cambered surface.

Drawings

Fig. 1 is a schematic view of a structure of an electric pan according to an embodiment of the present utility model;

Fig. 2 is a schematic view of an explosion structure of an electric pan according to an embodiment of the present utility model, wherein a dotted line L refers to an extending direction of a heating tube;

fig. 3 is a schematic cross-sectional structure of an electric pan according to an embodiment of the present utility model;

fig. 4 is an enlarged schematic view of the structure at a in fig. 3.

Reference numerals illustrate:

1. A heating plate; 11. an annular protrusion; 12. a concave groove; 13. a first transitional cambered surface; 14. a second transitional cambered surface; 15. a bottom ring; 16. an upper convex cambered surface; 2. a pot body; 21. a concave cambered surface; 3. a heat insulating shell; 4. a host base; 5. a heating tube.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Moreover, in the drawings, the Z axis represents the vertical direction, that is, the up-down direction, and the positive direction of the Z axis represents the up direction, and the negative direction of the Z axis represents the down direction; the X-axis in the drawing indicates the longitudinal direction, i.e., the front-to-rear direction, and the positive direction of the X-axis indicates the front and the negative direction of the X-axis indicates the rear; the Y-axis in the drawing represents the lateral direction, i.e., the left-right direction, and the positive direction of the Y-axis represents the left and the negative direction of the Y-axis represents the right. It should also be noted that the foregoing Z-axis, X-axis, and Y-axis are meant to be illustrative only and to simplify the description of the present utility model, and are not meant to indicate or imply that the devices or elements referred to must be in a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Referring to fig. 1-3, an electric heating cooker according to an embodiment of the utility model includes a heating plate 1 and a cooker body 2, wherein an annular protrusion 11 is protruding from the top of the heating plate 1, when the heating plate 1 is not heated, a portion of the top surface of the annular protrusion 11 is used for contacting with the bottom of the cooker body 2, other portions of the top surface of the annular protrusion 11 are spaced from the cooker body 2, and other portions of the top surface of the annular protrusion 11 are used for being deformed upwards to fit with the bottom of the cooker body 2 when heated.

In this embodiment, the annular protrusion 11 of the heat generating plate 1 is different from the existing annular protrusion in that it includes: when the heating plate 1 is not heated, that is, when the electric heating pot is powered off, the top surface of the annular protrusion 11 is not completely contacted with the bottom surface of the pot body 2, but only a part of the top surface of the annular protrusion 11 is contacted with the bottom surface of the pot body 2. So, when heating dish 1 is heated, namely when this electric heat pot circular telegram, the annular bulge 11 at heating dish 1 top will form the heat accumulation effect, and the temperature of annular bulge 11 top surface can be higher than the temperature of heating dish 1 other position top surfaces, and then makes the annular bulge 11 before generating heat the part that does not contact with pot body 2 bottom surface take place to warp upwards, can make this annular bulge 11 finally with pot body 2 bottom surface area of contact be greater than the current annular bulge after generating heat with pot body 2 bottom surface actual area of contact, pot body 2 can receive better heating effect.

The heat generating plate 1 is usually made of aluminum, and is deformed at a relatively high temperature. Assuming that the contact area between the existing annular protrusion and the bottom surface of the pan body 2 is 100% when the existing annular protrusion is not heated, the top surface of a partial area is deformed upwards after the existing annular protrusion is heated, and finally the actual contact area between the existing annular protrusion 11 and the bottom surface of the pan body 2 is 50%, in this embodiment, since only a part of the top surface of the annular protrusion 11 contacts with the bottom surface of the pan body 2 before being heated, for example, only 20% of the top surface contacts with the bottom surface of the pan body 2, and the top surface of the annular protrusion 11 also has 80% of the area not contacting with the pan body 2, the non-contact interval can be very small, so that when the annular protrusion 11 is heated, the part of the top surface of the annular protrusion 11 which is not contacted with the pan body 2 before being heated is deformed upwards, the contact area between the top surface of the annular protrusion 11 and the pan body 2 is finally greater than 50%, the heat transfer efficiency of the heating pan 1 to the pan body 2 is improved, and the heating effect of the pan body 2 is better.

Specifically, other parts of the top surface of the annular protrusion 11 are configured to deform upwards to attach to the bottom of the pot body 2 when heated, and under the condition that the area of the top surface of the annular protrusion 11 is the same as the area of the top surface of the existing annular protrusion, the deformation condition of the annular protrusion 11 after heating can be obtained through designing or testing the proportion of the contact area of the annular protrusion 11 before heating with the pot body 2 and/or the thickness and other parameters of the annular protrusion 11, so as to adjust the relevant parameters of the annular protrusion 11, and finally realize that the contact area of the top surface of the annular protrusion 11 after heating with the pot body 2 is greater than 50%.

Alternatively, referring to fig. 4, when the heating plate 1 is not heated, an intermediate position between the inner ring and the outer ring of the top surface of the annular protrusion 11 is in contact with the bottom of the pot 2; the distance between the top surface of the annular bulge 11 and the bottom of the pot body 2 is gradually increased along the direction from the middle position of the top surface of the annular bulge 11 to the outer ring, and the distance between the top surface of the annular bulge 11 and the bottom of the pot body 2 is gradually increased along the direction from the middle position of the top surface of the annular bulge 11 to the inner ring.

Here, the cross-sectional shape of the top surface of the annular protrusion 11 may be inverted "V", that is, before being heated, the top surface of the annular protrusion 11 may be just the bottom surface of the middle portion thereof contacting the bottom surface of the pan body 2, and the other regions do not contact the bottom surface of the pan body 2, that is, the top surface of the annular protrusion 11 is gradually increased in the direction from the middle position to the inner ring thereof, the top surface of the annular protrusion 11 is gradually increased in the direction from the middle position to the outer ring thereof, and the top surface thereof is gradually increased in the direction from the top surface thereof to the bottom surface of the pan body 2. When the annular bulge 11 is not heated, the top surfaces of the pot body 2 and the annular bulge 11 are in surface-to-line contact, after the annular bulge 11 is heated, the inner ring and the outer ring of the top surface of the annular bulge 11 are respectively deformed upwards to the middle position, so that the contact with the bottom surface of the pot body is realized, and finally the contact area between the pot body 2 and the annular bulge 11 is increased.

Referring to fig. 4, the electric pan further includes a heating tube 5, a bottom ring 15 is convexly disposed at the bottom of the heating plate 1, the bottom ring 15 is located below the annular protrusion 11, at least a portion of the heating tube 5 is embedded in the bottom ring 15, and the heating tube 5 is used for radiating heat upwards.

In this embodiment, the heating plate 1 specifically heats through the heating tube 5, specifically, the bottom of the heating plate 1 is convexly provided with the bottom ring 15, the bottom ring 15 extends along the extending direction of the annular protrusion 11, at least part of the heating tube 5 is embedded in the bottom ring 15, and the built-in part of the heating tube 5 can emit heat upwards, so that the top surface of the heating plate 1, especially the top surface of the annular protrusion 11, is rapidly heated.

The heat insulation structure can enable heat of the heating tube 5 to be basically emitted upwards, so that the heat emitted upwards by the heating tube 5 is preferentially transferred to the top surface of the heating plate 1, and then the heat is transferred to the upper pot body 2 and the periphery direction of the heating plate 1.

Here, because the bottom ring 15 is located below the annular protrusion 11, the heating tube 5 embedded in the bottom ring 15 is also located below the annular protrusion 11, so after the heat of the heating tube 5 is sent upwards, the annular protrusion 11 is heated first, and then heat is transferred to other positions of the heating plate 1, so that the heat accumulation of the annular protrusion 11 is facilitated, the temperature of the top surface of the annular protrusion 11 is higher than the top surface of other positions of the heating plate 1, and the annular protrusion 11 continuously subjected to high temperature, especially the top surface part which is not contacted with the pot body 2 before being heated, is deformed upwards to contact and fit with the bottom surface of the pot body 2, so that the heated area of the pot body 2 is increased.

In addition, since the heating tube 5 emits heat upward, the distance from the bottom of the bottom ring 15 to the heating tube 5 can be relatively small, for example, 2mm, the thickness of the bottom ring 15 can be reduced, and the weight of the entire heating plate 1 and even the electric cooker can be reduced.

Referring to fig. 1-3, the electric cooker further comprises a main machine base 4 and a heat insulation shell 3, wherein the heat insulation shell 3 is fixed in the main machine base 4, the heating plate 1 is fixed in the heat insulation shell 3, the heat insulation plate plays a role in heat insulation, and the heating plate 1 with heat can be prevented from burning the main machine base 4.

The two ends of the heating tube 5 in the extending direction can respectively lead out the positive electrode pin and the negative electrode pin downwards, and the positive electrode pin and the negative electrode pin can respectively pass through the heat insulation shell 3 downwards and are electrically connected with the electrical components of the host shell.

Optionally, the minimum distance from the heating tube 5 to the top surface of the annular protrusion 11 is greater than 3.5mm.

In this embodiment, since the heat generating tube 5 emits heat upward, the minimum distance from the top of the heat generating tube 5 to the top surface of the annular protrusion 11 is designed to be greater than 3.5mm, so that the annular protrusion 11 is prevented from burning through in the vertical direction to form a hole.

Alternatively, the projection of the heat generating tube 5 on the horizontal plane is made as a first projection, the projection of the top surface of the annular protrusion 11 on the horizontal plane is made as a second projection, and at least part of the first projection is located at a central position between the inner ring and the outer ring of the second projection.

Referring to fig. 2, since the annular protrusion 11 is formed in an annular shape as a whole, the top surface thereof has an inner ring near the center of the heat generating plate 1 and an outer ring near the edge of the heat generating plate 1, and the area between the inner ring and the outer ring of the annular protrusion 11, that is, the top surface of the annular protrusion 11, is in contact with the bottom surface of the pot 2 only in a partial area when the annular protrusion 11 is not heated, for example, as described above, only the intermediate position between the inner ring and the outer ring of the top surface thereof is in contact with the bottom surface of the pot 2. Because at least part of the first projection is positioned at the central position between the inner ring and the outer ring of the second projection, after the heating tube 5 is electrified and heated, the annular bulge 11 at the top can be heated uniformly, namely, the area from the middle position of the top surface of the annular bulge 11 to the inner ring and the area from the middle position to the outer ring can be heated uniformly, and the part, which is not contacted with the pot body 2 before being heated, of the annular bulge 11 is deformed upwards to be contacted with the pot body 2.

Wherein, referring to fig. 2, the dotted line L is the extending direction of the heat generating tube 5 embedded in the bottom ring 15, and also refers to the extending direction of the bottom ring 15, the cross-sectional shape perpendicular to the extending direction of the bottom ring 15 may be semicircular, and the projection of at least part of the heat generating tube 5 on the top surface of the annular protrusion 11 is located at the central position. As shown in fig. 2, the annular projection 11 has an annular race track shape as a whole, which includes a left region, a right region, and longer front and rear regions, and the heat generating tube 5 located at least under the front, rear, and right regions is located directly under the central position. The distances from the part of the heating tube 5 located right below the middle position to the inner ring and the outer ring of the annular protrusion 11 may be 15mm, respectively, that is, the width of the annular protrusion 11 may be 30mm, so that the annular protrusion 11 has a sufficient area to contact with the bottom surface of the pot body 2 after being heated.

Referring to fig. 2 and 4, alternatively, the vertical distance from the top surface of the annular protrusion 11 to the top surface of the heat generating plate 1 where the annular protrusion 11 is not provided may be in the range of 0.4mm to 0.5mm.

In this embodiment, the top surface of the annular protrusion and the top surface of the other positions of the heat generating plate 1 (the top surface where the annular protrusion 11 is not provided) may be in parallel relation, but the height of the annular protrusion 11 is not too high compared with the original top surface of the heat generating plate 1, and may be 0.4mm-0.6mm, for example, 0.5mm higher than the original top surface of the heat generating plate 1. This is because if the height of the annular protrusion 11 is too high, this will increase the distance between the top surface of the other position of the heating plate 1 and the bottom surface of the pot 2, thereby causing waste of heat from the top surface of the other position of the heating plate 1, and also reducing the heating effect of the pot 2.

In addition, the height of the annular protrusion 11 is not too high, which is also beneficial to reducing the overall vertical dimension of the heating plate 1, preventing the support of the pot body 2 at too high a position behind the heating plate 1, for example, if a user makes hot pot food in the pot body 2, the too high pot body 2 will affect the user experience.

Referring to fig. 3-4, optionally, the bottom surface of the pot body 2 is concaved upward to form an upward concave cambered surface 21, the top surface of the heating plate 1 includes an upward convex cambered surface 16, the annular protrusion 11 is convexly disposed on the upward convex cambered surface 16, and the top surface of the annular protrusion 11 is used for contacting with the upward concave cambered surface 21.

In this embodiment, the bottom surface of the pot body 2 is concaved upward to form a concave cambered surface 21, the top of the heating plate 1 is also a convex cambered surface 16, the top surface of the annular bulge 11 can also be a convex cambered surface, after the top surface of the annular bulge 11 supports the concave cambered surface 21 at the bottom of the pot body 2, a certain positioning effect can be given to the pot body 2, and the pot body 2 can be prevented from being obviously deformed upward after being heated to a certain extent, namely, the bottom surface of the pot body 2 is designed to be deformed reversely during processing (the concave cambered surface 21 is upward arranged on the bottom surface of the pot body 2), so that the subsequent upward deformation of the pot body 2 during heating is avoided.

Further, the concave arc surface 21 is a first ellipsoidal arc surface, the radius of the first ellipsoidal arc surface in the first direction is a first major axis radius, the radius of the first ellipsoidal arc surface in the second direction is a first minor axis radius, the ratio of the first major axis radius to the first minor axis radius is greater than 2, for example, the radius of the first ellipsoidal arc surface in the first direction (Y axis direction) is greater than or equal to 3005mm, the radius of the first ellipsoidal arc surface in the second direction (X axis direction) is greater than or equal to 1300mm, the first direction is parallel to the major axis direction of the ellipsoid in which the first ellipsoidal arc surface is located, and the second direction is parallel to the minor axis direction of the ellipsoid in which the first ellipsoidal arc surface is located.

In this embodiment, the pot body 2 may be a rectangular pot, on the basis of which the concave-up arc surface 21 is exactly an concave-up ellipsoidal arc surface, and the radius of the ellipsoidal arc surface in the long axis direction and the radius in the short axis direction should not be too small, for example, the radius of the ellipsoidal arc surface in the long axis direction is greater than or equal to 3005mm, the radius in the short axis direction is greater than or equal to 1300mm, and in cooperation with the convex-up arc surface 16 of the heating plate 1, the pot body 2 may be prevented from being deformed, that is, if the radius of the concave-up arc surface 21 in both directions is small, the bottom of the pot body 2 may be deformed by sinking. The concave arc surface 21 is a first ellipsoidal arc surface, the convex arc surface 16 may be a third ellipsoidal arc surface, where the third ellipsoidal arc surface is used to be concentric with the first ellipsoidal arc surface in the case that the top surface of the annular protrusion 11 supports the first ellipsoidal arc surface, and a portion of the annular protrusion 11 that is not in contact with the first ellipsoidal arc surface will deform upward to fit the first ellipsoidal arc surface after being heated.

Of course, in other embodiments, the concave arc surface 21 may be a spherical arc surface, and correspondingly, the convex arc surface 16 of the heat generating plate 1 is a spherical arc surface.

In other embodiments, the top surface of the annular projection 11 may not be inverted "V" shaped when unheated, as previously described. The top surface of the annular protrusion 11 may be a second ellipsoidal cambered surface, and the radius of the second ellipsoidal cambered surface in the third direction is a second major axis radius, the radius of the second ellipsoidal cambered surface in the fourth direction is a second minor axis radius, the third direction is parallel to the major axis direction of the ellipsoid in which the second ellipsoidal cambered surface is located, the fourth direction is parallel to the minor axis direction of the ellipsoid in which the first ellipsoidal cambered surface is located, and the difference between the first major axis radius and the first minor axis radius is smaller than the difference between the second major axis radius and the second minor axis radius.

Here, since the difference between the first major axis radius and the first minor axis radius is smaller than the difference between the second major axis radius and the second minor axis radius, when not heated, it can be realized that only the top surface of the annular protrusion 11 has its outer ring position in contact with the first ellipsoidal cambered surface, and the interval between the third ellipsoidal cambered surface and the first ellipsoidal cambered surface gradually increases in the direction from its outer ring to the inner ring, and after heated, it can also be realized that the contact area between the top surface of the annular protrusion 11 and the pot body 2 finally increases.

Referring to fig. 2 and 4, alternatively, the part of the upwardly convex arc surface 16 where the annular protrusion 11 is not provided is a third ellipsoidal arc surface, a concave groove 12 is concavely formed at the central position of the third ellipsoidal arc surface, and the top surface of the heating plate 1 at the concave groove 12 is lower than the top surface of the annular protrusion 11, that is, the bottom surface of the concave groove 12 is lower than the top surface of the annular protrusion 11.

In this embodiment, as in the prior art, the concave groove 12 may be disposed at the central position of the top surface of the heating plate 1, firstly, because the top surface of the heating plate 1 (specifically, the portion not provided with the annular protrusion 11) is the convex arc surface 16, by disposing the concave groove 12 at the central position, the central position of the heating plate 1 may be prevented from contacting with the bottom surface of the pan 2, and further, the phenomenon that the pan 2 or food burns due to serious heating at the bottom center of the pan 2 may be prevented.

Referring to fig. 2 and 4, alternatively, the inner ring of the top surface of the annular protrusion 11 is connected to the bottom surface of the concave groove 12 through a first transitional cambered surface 13, and the outer ring of the top surface of the annular protrusion 11 is connected to a position where the annular protrusion 11 and the concave groove 12 are not disposed on the third ellipsoidal cambered surface through a second transitional cambered surface 14.

In this embodiment, the inner ring of the top surface of the annular protrusion 11 is connected with other positions of the top surface of the heating plate 1 through the first transition cambered surface 13, specifically, the first transition cambered surface 13 is connected with the bottom surface of the concave groove 12, while the outer ring of the top surface of the annular protrusion 11 is connected with other positions of the heating plate 1 through the second transition cambered surface 14, so that the area of the annular protrusion 11 facing the pot body 2 can be increased, and even if the first transition cambered surface 13 and the second transition cambered surface 14 are not contacted with the bottom surface of the pot body 2, the heating effect on the pot body 2 can be increased.

Referring to fig. 2, the annular protrusion 11 may be alternatively provided at a position close to the edge of the heat-generating plate 1.

In this embodiment, the annular bulge 11 is specifically disposed at a position far away from the center of the heating plate 1 and close to the edge of the heating plate 1, so that the annular bulge 11 has a better supporting effect on the pot body 2, and meanwhile, the area of the top surface of the annular bulge 11 is larger, and in addition, because the annular bulge 11 has a heat accumulation effect, the heat of the area of the top surface of the heating plate 1 located inside the annular bulge 11 can be more effectively utilized, and the outward diffusion of the heat inside the inner ring of the annular bulge 11 can be blocked to a certain extent.

The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" and "a second" may explicitly or implicitly include at least one such feature.

Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.

Claims (10)

1. The utility model provides an electric food warmer, its characterized in that, including dish (1) and the pot body (2) generate heat, the top protrusion of dish (1) that generates heat is provided with annular bulge (11), works as when dish (1) generate heat is unheated, the part of the top surface of annular bulge (11) be used for with the bottom contact of the pot body (2), just other parts of the top surface of annular bulge (11) with pot body (2) interval sets up.

2. The electric pan according to claim 1, characterized in that when the heating plate (1) is not heated, an intermediate position between the inner ring and the outer ring of the top surface of the annular protrusion (11) is in contact with the bottom of the pan body (2); along the direction from the middle position of the top surface of the annular bulge (11) to the outer ring, the distance between the top surface of the annular bulge (11) and the bottom of the pot body (2) is gradually increased, and along the direction from the middle position of the top surface of the annular bulge (11) to the inner ring, the distance between the top surface of the annular bulge (11) and the bottom of the pot body (2) is gradually increased.

3. The electric food warmer according to claim 1, further comprising a heating tube (5), wherein a bottom ring (15) is provided at the bottom of the heating plate (1) in a protruding manner, and the bottom ring (15) is located below the annular protrusion (11), at least a part of the heating tube (5) is embedded in the bottom ring (15), and the heating tube (5) is configured to emit heat upwards.

4. A pan as claimed in claim 3, characterized in that the projection of the heating tube (5) onto the horizontal plane is made a first projection, the projection of the top surface of the annular projection (11) onto the horizontal plane is made a second projection, at least part of the first projection being located in a central position between the inner ring and the outer ring of the second projection.

5. A pan as claimed in claim 3, characterized in that the minimum distance of the heating tube (5) to the top surface of the annular projection (11) is greater than 3.5mm and/or that the vertical distance of the top surface of the annular projection (11) to the top surface of the heating plate (1) where the annular projection (11) is not provided is in the range of 0.4mm-0.5mm.

6. The electric food warmer according to claim 1, wherein the bottom surface of the pot body (2) is concavely formed with an upwardly concave arc surface (21), the top surface of the heating plate (1) includes an upwardly convex arc surface (16), the annular protrusion (11) is convexly disposed on the upwardly convex arc surface (16), and the top surface of the annular protrusion (11) is used for contacting with the upwardly concave arc surface (21).

7. The electric food warmer of claim 6, wherein the concave arc surface (21) is a first ellipsoidal arc surface, a radius of the first ellipsoidal arc surface in a first direction is a first major axis radius, a radius of the first ellipsoidal arc surface in a second direction is a first minor axis radius, a ratio of the first major axis radius to the first minor axis radius is greater than 2, the first direction is parallel to a major axis direction of an ellipsoid in which the first ellipsoidal arc surface is located, and the second direction is parallel to a minor axis direction of the ellipsoid in which the first ellipsoidal arc surface is located.

8. The electric food warmer according to claim 7, wherein the top surface of the annular protrusion (11) is a second ellipsoidal curved surface, the radius of the second ellipsoidal curved surface in a third direction is a second major axis radius, the radius of the second ellipsoidal curved surface in a fourth direction is a second minor axis radius, the third direction is parallel to the major axis direction of the ellipsoid in which the second ellipsoidal curved surface is located, the fourth direction is parallel to the minor axis direction of the ellipsoid in which the first ellipsoidal curved surface is located, and the difference between the first major axis radius and the first minor axis radius is smaller than the difference between the second major axis radius and the second minor axis radius.

9. The electric food warmer according to claim 6, wherein the portion of the upwardly convex arc surface (16) where the annular protrusion (11) is not provided is a third ellipsoidal arc surface, a concave groove (12) is concavely formed at a central position of the third ellipsoidal arc surface, and a groove bottom surface of the concave groove (12) is lower than a top surface of the annular protrusion (11).

10. The electric food warmer according to claim 9, wherein an inner ring of the top surface of the annular protrusion (11) is connected to the bottom surface of the concave groove (12) through a first transitional cambered surface (13), and an outer ring of the top surface of the annular protrusion (11) is connected to a position where the annular protrusion (11) and the concave groove (12) are not provided on the third ellipsoidal cambered surface through a second transitional cambered surface (14).