CN203493374U - Electric cooker for improving energy efficiency - Google Patents

Abstract

The utility model provides an electric cooker for improving energy efficiency. The electric pan comprises a rice cooker body, wherein the rice cooker body comprises an outer cooker; a liner is arranged in the outer cooker; the outer cooker comprises a bottom wall and a side wall; a heating plate is arranged between the bottom wall of the outer cooker and the liner; a heating element is fixed to the heating plate. The electric cooker is characterized in that the outer cooker is provided with a thermal insulation device for reducing heat transferred from the bottom wall to the side wall of the outer cooker; the thermal insulation device is positioned outside the projection of the heating element on the bottom wall of the outer cooker. The electric cooker has the advantage of improving the energy efficiency and can be applied to products such as electric pressure cookers, electric cookers and electric stewpans.

Description

A kind of electric food warmer that improves efficiency

Technical field

The utility model relates to a kind of culinary cuisine utensil, especially a kind of electric food warmer that improves efficiency.

Background technology

Electric food warmer, for example electric pressure cooking saucepan, electric cooker, its energy-conserving and environment-protective have at present been market comsupton and publicity focus, high energy efficiency is also the leading indicator of properties of product.For electric food warmer product, higher efficiency value, is not singly attraction, is the performance of product technology content yet; And for consumers, the product of high energy efficiency is out and out for consumer saves use cost, therefore, high efficiency product be the producer be also consumer's pursuit.

The common method of the efficiency of electric food warmer raising is at present below heat-generating disc, to increase reflecting plate, and for example aluminium reflecting plate, is used for the reflect heat of heat-generating disc downward radiation to go back, and improves capacity usage ratio.But the method need to increase reflecting plate, existence increases cost, and increase installation difficulty, and newly-increased aluminium reflecting plate meeting heat absorption itself, cause reflecting plate meeting itself to external radiation amount of heat, and whole raising efficiency effect is undesirable.

Utility model content

Technical problem to be solved in the utility model be to overcome the deficiencies in the prior art and provide a kind of and do not increase cost, efficiency improves significant electric food warmer.

In order to achieve the above object, the technical solution of the utility model is as follows:

A kind of electric food warmer that improves efficiency, comprise a pot body, pot body comprises outer pot, inner bag is set in outer pot, and outer pot comprises diapire and sidewall, between the diapire of outer pot and inner bag, is provided with heat-generating disc, on heat-generating disc, be fixed with heat generating member, it is characterized in that, outer pot is provided with the heat-proof device that is delivered to outer pot sidewall for reducing diapire heat, and described heat-proof device is positioned at the heat generating member outside of the bottom of a pan wall projection outside.

In the utility model one embodiment, described heat-proof device is positioned at described outer pot sidewall near the region of described outer pot diapire or is positioned at described outer pot diapire.

In the utility model one embodiment, described heat-proof device is at least two, and described two adjacent heat-proof devices in a circumferential direction space are arranged or described two adjacent heat-proof devices are mutually separated in radial manner.

In the utility model one embodiment, described heat-generating disc diapire is provided with at least two legs, and described heat-generating disc is fixed on outer pot diapire by leg, and described heat-proof device is positioned on outer pot diapire and is positioned at the outside of described leg.

In the utility model one embodiment, described heat-proof device is positioned at the described heat-generating disc outside of the bottom of a pan wall projection outside.

In the utility model one embodiment, described heat-proof device is the region between the projection of the bottom of a pan wall outside at heat generating member edge and heat-generating disc edge.

In the utility model one embodiment, described heat-proof device is heat insulation slit.

In the utility model one embodiment, the surrounding of described heat-proof device is provided with reinforcement.

In the utility model one embodiment, the width of described heat insulation slit is 2-10mm.

In the utility model one embodiment, described heat-proof device is heat insulation slit and the filler with low thermal conductivity, and described filler is filled in heat insulation slit.

In the utility model one embodiment, described outer pot diapire comprises the first diapire and connecting portion, and described connecting portion connects outer pot sidewall and the first diapire, and described heat-proof device is located on the first diapire or connecting portion.

The utlity model has following beneficial effect:

1, because the outer pot at electric food warmer is provided with the heat-proof device that is delivered to outer pot sidewall for reducing diapire heat, described heat-proof device is positioned at the outside of heat generating member pot bottom projection outside, thereby the heat that is positioned at the outer pot diapire region of heat-proof device inner side is not easy to be delivered to outer pot sidewall, thereby reduced the temperature of outer pot sidewall, thereby reduced outer pot to extraradial heat, thereby improved efficiency.

2, because described heat-proof device is positioned at the described heat-generating disc outside of the bottom of a pan wall projection outside, thereby can further reduce the temperature of outer pot sidewall, thereby further reduce the outside radiations heat energy of outer pot, improve efficiency.

3, due to heat-proof device at heat generating member edge and heat-generating disc edge the region between the projection of the bottom of a pan wall outside, thereby user can't see heat-proof device when placing inner bag, thereby can not give the bad impression of user.

4, heat-proof device is heat insulation slit, and the width of heat insulation slit is 2-10mm, thereby can take into account the intensity of manufacturing process, effect of heat insulation and outer pot diapire, has good effect.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of the required use of embodiment be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the profile of the utility model the first embodiment electric food warmer;

Fig. 2 is the stereogram of the utility model the first embodiment outer pot;

Fig. 3 is the top view of the utility model the first embodiment outer pot;

Fig. 4 is the top view of the heat insulation slit distortion of the utility model the first embodiment;

Fig. 5 is the top view of the utility model the second embodiment outer pot;

Fig. 6 is the top view of the utility model the 3rd embodiment outer pot.

Reference numeral:

10: pot body 11: outer pot

111: outer pot diapire 111a: the first diapire

111b: connecting portion 112: outer pot sidewall

113: installing hole 12,13: heat insulation slit

15: the second heat insulation slits of 14: the first heat insulation slits

20: inner bag 30: heat-generating disc

31: leg 32: heat generating member

40: pot cover.

The specific embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described below, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.

The first embodiment

The utility model provides a kind of electric food warmer that improves efficiency, refer to Fig. 1-Fig. 3, electric food warmer comprises pot body 10 and pot cover 40, pot cover 40 is arranged on pot body 10 tops, pot cover 40 is hinged or be connected by other means with pot body 10, pot body 10 comprises outer pot 11, the interior inner bag 20 that arranges of outer pot 11, between inner bag 20 and outer pot diapire 111, be provided with the heat-generating disc 30 that is used to provide heat, heat-generating disc 30 contacts with inner bag 20, on heat-generating disc 30, be fixed with heat generating member 32, heat generating member 32 is such as thinking the heater elements such as heat-generating pipe, the general form such as twist of heat generating member 32 is positioned at the lower surface of heat-generating disc 30, between heat generating member 32 and outer pot diapire 111, there is heat radiation gap, heat generating member 32 is electrically connected to power supply, after heat generating member 32 energisings, heating is used to provide heat and passes to heat-generating disc 30, heat-generating disc 30 transferring heats are to inner bag 20, heat-generating disc 30 is fixed on outer pot diapire 111 by leg 31, in the present embodiment, the quantity of described leg 31 is three, corresponding, described outer pot diapire 111 is provided with the installing hole 113 of corresponding leg 31.

Utility model inventor finds, after heat generating member 32 energising work, heat generating member 32 passes to heat-generating disc 30 by heat major part, heat-generating disc 30 passes to inner bag 20 by most of heat by contact, simultaneously, owing to having heat radiation gap between heat generating member 32 and outer pot diapire 111, preferably, described heat generating member 32 is 6-18mm with the gap of outer pot diapire 111, when the gap of heat generating member 32 and outer pot diapire 111 is less than 6mm, the hypotelorism of outer pot diapire 111 and heat generating member 32, cause heat generating member 32 heat is easy to radiation or is delivered on outer pot diapire 111, cause the temperature of outer pot diapire 111 very high, thereby cause the thermal efficiency of heat generating member 32 low, when the gap of heat generating member 32 and outer pot diapire 111 is greater than 18mm, cause outer pot integral body to be elongated, compact not.Thereby the heat generating member 32 outside the bottom of a pan of meeting wall 111 some heats of direction radiation, simultaneously, heat-generating disc 30 is some heat downward radiation also, due to heat-generating disc 30, heat generating member 32 is smaller with the gap of outer pot diapire 111, particularly the temperature of heat generating member 32 itself is compared with high and heat generating member 32 is little with the gap of outer pot diapire 111, thereby heat-generating disc 30 and heat generating member 32 have part heat downward radiation to outer pot diapire 111, cause the temperature of outer pot diapire 111 very high, further, because outer pot diapire 111 is the same with the material of outer pot sidewall 112, all with cold-reduced sheet, the thermal conductivity factor of cold-reduced sheet is about 45w/ (m*k) (unit of thermal conductivity factor for watt/(rice Kelvin)), because outer pot diapire 111 and outer pot sidewall 112 are integrally formed, thereby the heat of outer pot diapire 111 passes to outer pot sidewall 112 very soon, thereby cause the temperature of outer pot sidewall 112 also very high, thereby whole outer pot 11 is radiations heat energy outwards, and this part heat can not be used for effectively utilizing, thereby cause falling to extraradial this part heat waste, caused the reduction of efficiency.The scheme that utility model people of the present utility model improves efficiency is as follows.

In the utility model, outer pot 11 is provided with heat-proof device, heat-proof device is used for reducing outer pot diapire 111 heats and passes to outer pot sidewall 112, heat-proof device is positioned at the outside of heat generating member 32 the bottom of a pan wall 111 projections outside, electric food warmer at work, because heat generating member 32 itself produces heat, thereby the relative heat-generating disc of heat generating member 32 temperature is higher, and, it is high that heat-generating disc 30 temperature in the relative heat generating member of temperature 32 outsides of the heat-generating disc 30 of heat generating member 32 inner sides are wanted, thereby the heat-generating disc 30 part heats of heat generating member 32 and heat generating member 32 inner sides are to outer pot 11 direction radiation, thereby cause heat-generating disc 30 view field's temperature of the corresponding heat generating member 32 of outer pot diapire 111 and heat generating member 32 inner sides very high, thereby can be to other region transferring heats of outer pot 11, and in utility model, when the heat of heat-generating disc 30 view fields of the corresponding heat generating member 32 of outer pot diapire 111 and heat generating member 32 inner sides transmits to outer pot 11 other regions, subregion can run into heat-proof device, thereby reducing heat outwards transmits, thereby reduced the interior total amount of heat of transmitting to the outer pot 11 in heat-proof device outside of unit interval, thereby the relatively front case temperature of outer pot 11 temperature in heat-proof device outside is lower, because temperature reduces, thereby the outer pot 11 that is positioned at heat-proof device outside reduces to extraradial heat, thereby can improve efficiency.

Particularly, please refer to Fig. 3, in the present embodiment, described heat-proof device is positioned at described outer pot diapire 111, and described heat-proof device is heat insulation slit 12, by outer pot diapire 111 subregions are hollowed out, forms heat insulation slit 12, heat insulation slit 12 is circular arc, certainly, in other embodiment of the present utility model, described heat insulation slit 12 can also be other suitable shapes.Heat insulation slit 12 is positioned on outer pot diapire 111, and be positioned at the outside of heat generating member 32 the bottom of a pan wall 111 projections outside, in the present embodiment, the quantity of described heat insulation slit 12 is three, the setting of mutually staggering in a circumferential direction of two adjacent heat insulation slits 12, two adjacent heat insulation slits 12 are not overlapping in a circumferential direction, also between two adjacent heat insulation slits 12, can there is in a circumferential direction the cold-reduced sheet that forms outer pot diapire 111, for example, in the present embodiment, heat insulation slit 12 is positioned on same circumference, and be interrupted and arrange between two adjacent heat insulation slits 12, outer pot diapire 111 regions between two adjacent heat insulation slits 12 are provided with installing hole 113, be used for being connected with the leg 31 of heat-generating disc 30, be that heat insulation slit 12 is between 30 liang of legs 31 of heat-generating disc.In addition, the utility model is not limited to two adjacent heat-proof devices and is spaced from each other in a circumferential direction, in other embodiment of the present utility model, the quantity of described heat insulation slit is many, described two adjacent heat insulation slits can also overlap in a circumferential direction, are mutually separating in the radial direction.In addition, in other embodiment of the present utility model, for example, referring to Fig. 4, described heat insulation slit can also part be spaced from each other in a circumferential direction, and part is being separated in the radial direction mutually.The quantity of the heat insulation slit of the utility model is not limited to three, and those of ordinary skill in the art can adjust according to actual needs.In addition, in the radial direction same, the quantity of described heat insulation slit also can be not limited to one, and in other embodiment of the present utility model, described heat insulation slit can also arrange many in the radial direction.

The present embodiment is because the bottom of a pan wall 111 is outside provided with heat insulation slit 12, heat insulation slit 12 is positioned at the outside of wall 111 projections of the bottom of a pan outside of heat generating member 32, heat generating member 32 and the outside the bottom of a pan of heat-generating disc 30 wall 111 radiations heat energies, now, the corresponding heat generating member 32 of outer pot diapire 111 and within regional temperature want relative outer pot diapire 111 other regional temperatures high, thereby, heat is all generally to spread to outer pot 11 surroundings from higher outer pot diapire 111 regions of temperature, in the present embodiment, when heat diffusion is neighbouring to heat insulation slit 12, owing to being air in heat insulation slit 12, and the thermal conductivity factor of air is about 0.026w/m*k, be far smaller than the thermal conductivity factor 45w/m*k of cold-reduced sheet, thereby outer pot diapire 111 heats that cause being positioned at heat insulation slit 12 inner sides are difficult to be delivered to the outer pot diapire 111 in heat insulation slit 12 outsides, thereby the heat of outer pot diapire 111 is difficult to be transmitted to outer pot sidewall 112 by heat insulation slit 12, thereby the relatively front case of the temperature that causes outer pot sidewall 112 is lower, thereby outer pot 11 reduces to extraradial heat, thereby reduce the loss of useless energy consumption, can improve the efficiency of electric food warmer.

Inventor is to using the electric food warmer of the utility model outer pot to test, and through measuring, the outer pot sidewall 112 in the relative background technology of outer pot sidewall 112 of the present utility model can reduce 40-70 ℃.Inventor is by using electric cooker product to test, and electric cooker model is identical, and electric cooker power is 860W, and residing external environment is 22.5 degree, and humidity is 65%, and the test data of the electric cooker of the outer pot of installation the present embodiment is please in Table one.

Table one

The correction data of electric cooker of conventional outer pot is installed please in Table two.

Table two

Known by above two forms contrast, use the electric cooker product thermal efficiency of the utility model outer pot 11 at least to improve 1%, maximum is improved more than 2%, thereby, use the electric cooker product thermal efficiency of the utility model outer pot 11 to significantly improve.

In the present embodiment, the width of heat insulation slit 12 is preferably 2-10mm.When the width of heat insulation slit 12 is less than 2mm, because the distance of slit is too small, thereby trap heat is delivered to the DeGrain of the outer pot diapire 111 in heat insulation slit 12 outsides from the outer pot diapire 111 of heat insulation slit 12 inner sides, and bad the doing of the too small mould of slit, heat insulation slit 12 is not easy to form; When the width of heat insulation slit 12 is greater than 10mm, easily cause outer pot 11 strength ratios poor, thereby cause outer pot diapire 111 to be easily out of shape, thereby the preferable width scope of the heat insulation slit 12 of the present embodiment is taken into account manufacturing process, effect of heat insulation and outer pot diapire 111 intensity, has good effect.

In general, when the bottom of a pan wall 111 arranges the slit of strip outside, the bulk strength of outer pot 11 can reduce, thereby cause outer pot 11 to be easily out of shape, for this problem, outer pot diapire 111 can arrange reinforcement, reinforcement be positioned at heat insulation slit 12 near, be used for strengthening the intensity of outer pot diapire 111, certainly, some conventional modes that those of ordinary skill in the art can also arrange other are used for strengthening the intensity of outer pot diapire 111.

In the present embodiment, described heat insulation slit 12 is positioned at the outside of described heat generating member 32 the bottom of a pan wall 111 projections outside, in order to prevent that user from can see heat insulation slit 12 when placing inner bag 20, thereby may cause the bad impression to user, preferably, region between corresponding heat generating member 32 edges, the residing region of described heat insulation slit 12 and heat-generating disc 30 edges, be the region of heat insulation slit 12 between heat generating member 32 edges and the bottom of a pan wall 111 projections outside of heat-generating disc 30 edges, in general, described heat generating member 32 spiralitys are around the home on heat-generating disc 30, described heat-generating disc 30 is also circular, thereby the annular region between corresponding heat generating member 32 edges, the residing region of described heat insulation slit 12 and heat-generating disc 30 edges.

In other embodiment of the present utility model, owing to can transferring heat to heat-generating disc after heat generating member heating, high thereby although the heat-generating disc region that is positioned at heat generating member outside is not positioned at the heat-generating disc temperature of heat generating member inner side, but temperature is also higher, thereby the heat-generating disc that is positioned at heat generating member outside also may be by heat radiation to the outer pot that is positioned at heat insulation slit outside, thereby reduced to a certain extent the effect of heat insulation slit, in order further to reduce the temperature of described outer pot sidewall, preferably, described heat insulation slit is positioned at the described heat-generating disc outside of the bottom of a pan wall projection outside, thereby, the heat of the outside the bottom of a pan of heat-generating disc wall radiation can stop through heat insulation slit, thereby can further reduce the temperature of outer pot sidewall, can further improve the efficiency of electric food warmer.

In the present embodiment, described outer pot diapire 111 comprises the first diapire 111a and connecting portion 111b, connecting portion 111b connects outer pot sidewall 112 and the first diapire 111a, described heat insulation slit 12 is positioned on described the first diapire 111a, in other embodiment of the present utility model, described heat insulation slit can also be positioned on described connecting portion, or a described heat insulation slit part is positioned on the first diapire, and a part is positioned on described connecting portion.

In addition, heat-proof device of the present utility model is not limited to heat insulation slit, in other embodiment of the present utility model, described heat-proof device can also comprise heat insulation slit and filler, filler is the material with low heat conductivity, the low coefficient materials of leading such as mica material, earth silicon material, pottery, filler is filled in heat insulation slit, the better cohesive material that is mixed with in filler.In other embodiment of the present utility model, described heat insulation slit can be a whole circle, be that described heat insulation slit is a narrow annular channel, and the outer pot diapire that is positioned at narrow annular channel inner side is connected by filler with the outer pot diapire that is positioned at heat insulation slit outside, and described filler has heat-blocking action and also have connection function.

In addition, heat-proof device of the present utility model is not limited to be positioned at outer pot diapire, in other embodiment of the present utility model, described heat-proof device can also be positioned at described outer pot sidewall near the region of described outer pot diapire, it is the middle and lower part that described heat-proof device can be positioned at described outer pot sidewall, when heat-proof device is positioned at described outer pot sidewall near the region of described outer pot diapire, described heat-proof device can reduce the heat of diapire, lower sidewall to side wall upper part transmission, thereby reduce, be positioned at the temperature of heat-proof device top outer pot sidewall, thereby can improve the efficiency of electric food warmer.

Embodiment 2

Fig. 5 is the top view of the utility model the second embodiment electric food warmer, the structure of Fig. 5 and the structural similarity of Fig. 3, and therefore identical component symbol represents identical element, the main difference point of the present embodiment and the first embodiment is the position of heat-proof device.

Refer to Fig. 1 and Fig. 5, in the present embodiment, heat-generating disc 30 is arranged on outer pot diapire 111, on heat-generating disc 30, be fixed with heat generating member 32, between heat generating member 32 and outer pot diapire 111, there is heat radiation gap, three legs 31 are arranged at heat-generating disc 30 bottoms, leg 31 is positioned at the outside of heat generating member 32, corresponding, outer pot diapire 111 is provided with installing hole 113, near the corresponding installing hole 113 of outer pot diapire 111, be provided with the boss of strengthening outer pot diapire 111 intensity, heat-generating disc 30 is fixed on leg 31 on outer pot diapire 111 by the combination of nut and screw, heat-generating disc 30 legs 31 contact with outer pot diapire 111.Thereby, when heat generating member 32 heating, heat generating member 32 transferring heats are to heat-generating disc 30, and heat-generating disc 30 directly passes to outer pot diapire 111 by contact by leg 31 by heat, thereby near the temperature corresponding heat-generating disc 30 legs 31 of outer pot diapire 111 can be relatively high.In the present embodiment, outer pot diapire 111 is provided with the heat-proof device that is delivered to outer pot sidewall 112 for reducing outer pot diapire 111 heats, described heat-proof device is positioned at the outside of heat generating member 32 the bottom of a pan wall 111 projections outside, particularly, refer to Fig. 5, in the present embodiment, described heat-proof device is positioned at the outside of described leg 31, heat-proof device is heat insulation slit 13, heat insulation slit 13 is semicircular arc, thereby, heat insulation slit 13 can reduce near the outer pot diapire 111 of heat leg 31 and be delivered to outer pot sidewall 112, thereby reduce the temperature of outer pot sidewall 112, thereby reduce outer pot 11 to extraradial heat, thereby can effectively improve the efficiency of electric food warmer.

Embodiment 3

Fig. 6 is the stereogram of the utility model the 3rd embodiment electric food warmer, the structure of Fig. 6 and the structural similarity of Fig. 3, and therefore identical component symbol represents identical element, the main difference point of the present embodiment and the first embodiment is the setting of heat-proof device.

Refer to Fig. 1 and Fig. 6, in the present embodiment, between described outer pot 11 and inner bag 20, be provided with heat-generating disc 30, heat-generating disc 30 is provided with heat generating member 32, between heat generating member 32 and outer pot diapire 111, there is heat radiation gap, heat-generating disc 30 is fixed on outer pot diapire 111 by leg 31, in the present embodiment, outer pot diapire 111 is provided with the heat-proof device that is delivered to outer pot sidewall 112 for reducing diapire heat, described heat-proof device is positioned at the outside of heat generating member 32 the bottom of a pan wall 111 projections outside, particularly, refer to Fig. 6, in the present embodiment, described heat-proof device comprises the first heat insulation slit 14 and the second heat insulation slit 15, the first heat insulation slit 14 is between two legs 31, the second heat insulation slit 15 is positioned at the outside of leg 31, thereby the present embodiment effect of heat insulation is all better than the effect of heat insulation of the first embodiment and the second embodiment.

In above embodiment, the through hole that described heat insulation slit is arc, but the utility model is not limited to this, in other embodiment of the present utility model, described heat insulation slit can also be the hole of other shapes such as blinds hole, and the quantity big or small and heat insulation slit of described heat insulation slit can be adjusted as required.

Electric food warmer of the present utility model can be the culinary products such as electric cooker, electric pressure cooking saucepan, electric cooking pot.

In sum, in the utility model, because the outer pot at electric food warmer is provided with the heat-proof device that is delivered to outer pot sidewall for reducing diapire heat, described heat-proof device is positioned at the outside of heat generating member pot bottom projection outside, thereby the heat that is positioned at the outer pot diapire region of heat-proof device inner side is not easy to be delivered to outer pot sidewall, thereby reduced the temperature of outer pot sidewall, thereby reduced outer pot to extraradial heat, thereby improved efficiency.

The above; it is only the specific embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims (11)

1. an electric food warmer that improves efficiency, comprise a pot body, pot body comprises outer pot, inner bag is set in outer pot, and outer pot comprises diapire and sidewall, between the diapire of outer pot and inner bag, is provided with heat-generating disc, on heat-generating disc, be fixed with heat generating member, it is characterized in that, outer pot is provided with the heat-proof device that is delivered to outer pot sidewall for reducing diapire heat, and described heat-proof device is positioned at the heat generating member outside of the bottom of a pan wall projection outside.

2. the electric food warmer of raising efficiency as claimed in claim 1, is characterized in that, described heat-proof device is positioned at described outer pot sidewall near the region of described outer pot diapire or is positioned at described outer pot diapire.

3. the electric food warmer of raising efficiency as claimed in claim 1 or 2, it is characterized in that, described heat-proof device is at least two, and described two adjacent heat-proof devices in a circumferential direction space are arranged or described two adjacent heat-proof devices are mutually separated in radial manner.

4. the electric food warmer of raising efficiency as claimed in claim 1 or 2, it is characterized in that, described heat-generating disc diapire is provided with at least two legs, and described heat-generating disc is fixed on outer pot diapire by leg, and described heat-proof device is positioned on outer pot diapire and is positioned at the outside of described leg.

5. the electric food warmer of raising efficiency as claimed in claim 1 or 2, is characterized in that, described heat-proof device is positioned at the described heat-generating disc outside of the bottom of a pan wall projection outside.

6. the electric food warmer of raising efficiency as claimed in claim 1 or 2, is characterized in that, described heat-proof device is the region between the projection of the bottom of a pan wall outside at heat generating member edge and heat-generating disc edge.

7. the electric food warmer of raising efficiency as claimed in claim 1 or 2, is characterized in that, described heat-proof device is heat insulation slit.

8. the electric food warmer of raising efficiency as claimed in claim 7, is characterized in that, the surrounding of described heat insulation slit is provided with reinforcement.

9. the electric food warmer of raising efficiency as claimed in claim 7, is characterized in that, the width of described heat insulation slit is 2-10mm.

10. the electric food warmer of raising efficiency as claimed in claim 1 or 2, is characterized in that, described heat-proof device is heat insulation slit and the filler with low thermal conductivity, and described filler is filled in heat insulation slit.

The electric food warmer of 11. raising efficiencies as claimed in claim 1 or 2, is characterized in that, described outer pot diapire comprises the first diapire and connecting portion, and described connecting portion connects outer pot sidewall and the first diapire, and described heat-proof device is located on the first diapire or connecting portion.

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