CN100496350C - Electric pressure cooker - Google Patents
Electric pressure cooker Download PDFInfo
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- CN100496350C CN100496350C CNB2007101277191A CN200710127719A CN100496350C CN 100496350 C CN100496350 C CN 100496350C CN B2007101277191 A CNB2007101277191 A CN B2007101277191A CN 200710127719 A CN200710127719 A CN 200710127719A CN 100496350 C CN100496350 C CN 100496350C
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Abstract
The present invention relates to a kind of electric pressure cooker and electric rice cooker. It includes outer shell, pot cover, inner pot, heating disk and temperature detection and control device of electric heating pot. The inner pot is placed in the upper portion of heating disk, and said inner pot is a stainless steel single-layer structure. The temperature detection and control device of invented electroheating pot is formed from heat sensing element and control circuit of electroheating pot, and said heat sensing element is fixed on the heating disk.
Description
Technical field
The present invention relates to the electric heating pot technical field, more particularly relate to the improvement technology of electric heating pot such as electric pressure cooking saucepan, electric cooker.
Background technology
Traditional electric pressure cooking saucepan, electric cooker generally all are on the top of electric heat-generating disc a pot inner bag to be set, the pot inner bag generally adopts aluminum material, and be coated with non-adhesive material at pot inner bag inner surface, because non-viscous paint such as Teflon can decompose the noxious material that generation can be carcinogenic more than 260 ℃, be unfavorable for that people's is healthy.
For avoiding the defective of aluminum pot inner bag, occurred the stainless-steel pan inner bag since 2000, but adopted heater to be cast into the technology of aluminium dish, because aluminium is different with stainless thermal coefficient of expansion to the heat-generating disc of inner bag heating, can cause inner bag and heat-generating disc loose contact during heating, temperature distributing disproportionation is even.In addition, the stainless coefficient of heat conduction is 16.1W/m ℃～26.4W/m ℃, aluminium is that the coefficient of heat conduction is 160W/m ℃, the stainless coefficient of heat conduction only is 1/6～1/10 of an aluminium, stainless steel inner container contacts with heat-generating disc inequality slightly, heat can not in time conduct, and appears at easily to occur crispy rice or meal is burnt when cooking.
Traditional view thinks to have only under the corresponding to situation of curvature of the bottom of a pan and heat-generating disc contact-making surface, and it is relative even that the bottom of a pan and heat-generating disc are heated.For a long time, for keeping the consistent of inner bag and heat-generating disc coefficient of thermal expansion, all adopt inner bag composite bottom layer structure, be generally three-decker, the inner bag and the lower floor at the compound end as the disclosed CN2428061 of Patent Office of the People's Republic of China, CN2566770, CN2623129 etc. are stainless steel, intermediate course is an aluminium, the aluminium sheet of interlayer is thicker, can reach 2mm, consistent with the thermal deformation that forces stainless steel layer with interlayer, the disclosed text of CN2852895 is the pressing one deck aluminium sheet in addition of the inside and outside branch at the bottom of stainless steel inner container then, with before and after keeping being heated at the bottom of the inner bag all the time with the fitting tightly of heat-generating disc.Yet the structure at this compound end is brought the difficulty of processing on the one hand, and consumptive material is more, on the other hand because the thermal change coefficient of stainless steel and aluminium is different, easily causes separating of aluminium lamination and stainless steel layer after using repeatedly, and inner bag only can be kept the service life of half a year.
And heat-generating disc generally is fixed on the chassis, top of inner cover by feet at present, heat-generating disc is not removable, because because alignment error or use deviation, the heat-generating disc of electric heating pot is fixed, thereby work as heat-generating disc and can't adjust to optimum contacting state with the situation that contacts the contact of meeting appearance point in the bottom of a pan.Even but its heat-generating disc above-below direction of the electric pressure cooking saucepan that has moves, also do not possess the automatic aligning function, the some contact condition can't improve, and pot bottom can occur to contact bad situation with heat-generating disc, thereby cause occurring crispy rice or meal is burnt when cooking.
Electric heating pot is provided with temp detecting controller as electric pressure cooking saucepan, electric cooker, this device is electrically connected with control circuit, realizes the security control to electric heating pot.Existing electric heating pot directly detects the inner bag temperature, perforate in the middle of heat-generating disc needs, and thermistor is arranged in the middle perforate of heat-generating disc, sends signal to control circuit by the temperature detection to bottom of pot body.Adopt the defective of this mode need to be other more supporting handware, the cost height, structure and processed complex, secondly, because the temperature induction part branch is arranged on the centre of heat-generating disc, the detection of temperature is subject to the heat-generating disc Temperature Influence, makes detection inaccurate; Once more, because middle perforate has reduced the contact area of pot courage bottom with heat-generating disc, thereby influenced the result of use of electric heating pot.
Summary of the invention
Purpose of the present invention provides a kind of pot of inner bag and heat-generating disc contact area big for the deficiency that solves prior art exactly, is heated evenly, and is simple in structure, low-cost low electric pressure cooking saucepan.
The present invention also provides a kind of electric pressure cooking saucepan of the mode by the temperature of heat-generating disc being carried out temperature-sensitive control.
The present invention adopts following technical solution to realize above-mentioned purpose: a kind of electric pressure cooking saucepan, electric cooker, the temp detecting controller that comprises shell, pot cover, pot inner bag, heat-generating disc, electric heating pot, the pot inner bag is arranged on the top of heat-generating disc, it is characterized in that the contact-making surface bottom of this pot inner bag and heat-generating disc is the stainless steel single layer structure.
As further specifying of such scheme, described pot inner bag bottom is a cambered surface with the contact-making surface of heat-generating disc, and the cambered surface radius in the bottom of a pan is than the big 3%-30% of cambered surface radius of heat-generating disc, and the best is 5%-10%.
The temp detecting controller of described electric pressure cooking saucepan is made of the control circuit that heat-sensitive element connects electric heating pot, and this heat-sensitive element is fixed on the heat-generating disc, controls by the temperature of the direct perception heat-generating disc of heat-sensitive element; Be fastened on bottom the best of heat-generating disc.
Described heat-generating disc bottom is provided with feet, and this feet bottom has screw, and heat-sensitive element is a thermistor, and thermistor directly is fixed on this screw by installation sheet.
This installation sheet expands into " ten " font, and its opposite end has the hole, two holes is fixed on the screw of feet by screw, and the curved folding of tearing open in two ends contains thermistor in addition.
The bottom of described heat-generating disc is floating type syndeton, the bottom that this floating type syndeton that suspends is included in heat-generating disc is provided with the feet more than three or three, the feet bottom is provided with screw, be fixed with connecting rod on the screw, on this connecting rod, resiliency supported is housed, the hole of opening on the inner cover is passed in the connecting rod bottom, and this aperture, hole is greater than the diameter of connecting rod.Described feet is equidistant to be arranged on the same circumference of heat-generating disc bottom.
Described resiliency supported is a kind of in wire spring or the shell fragment assembly.
Described shell fragment assembly constitutes one group by two flexure strip sockets, is serially connected with a group or more shell fragment assembly on this connecting rod.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
1, adopted stainless steel single layer structure inner bag to compare with the multiple bottom structure of traditional multilayer, simple in structure, cost is low, comparing with aluminum material does not need increasing non-sticking lining, the composition that do not contain hazardous substance, and it is healthy to help people.
2, the present invention adopts the stainless steel single layer structure at the pot inner bag, because inner bag bottom and the big slightly radius of heat-generating disc contact site, through a large amount of experiments, the thermal change rule of unlike material is grasped and is used in success, when being the radius of big 3%-30%, when heated condition, the radius of the radius of its heat-generating disc and inner bag bottom can be consistent substantially, thereby can guarantee the uniformity of being heated effectively, and in the prior art, people's traditional view is the radius of heat-generating disc when remaining on heated condition not and consistent the getting final product of radius of inner bag bottom, thereby the difference of the unlike material coefficient of thermal expansion when not considering heated condition, consistent as the bottom of a pan on the 0.6mm stainless steel material of existing 202 type products with the radius of curvature of heat-generating disc contact-making surface, promptly the surperficial radius of the radian for heat-generating disc is 650mm, when the radius in its bottom of a pan also adopts 650mm to work as heat-generating disc work, under the situation of surface temperature in the time of 100 ℃-200 ℃, its the bottom of a pan and heat-generating disc surface changes as Fig. 1-shown in Figure 4, thereby in the prior art in order to guarantee being heated evenly of the bottom of a pan, promptly be this at the bottom of must adopting the compound layer pot inner bag of stainless steel.
Its heat-generating disc of the present invention simultaneously is floating type setting, even because alignment error or use deviation to cause inner bag and heating to be made an inventory to contact or the heart is forbidden, under the gravity effect of pot inner bag and interior food thereof, heat-generating disc floats and automatic aligning, make pot inner bag bottom have the contact-making surface of working preferably with heat-generating disc, inner bag is heated evenly, and the situation of meal can not occur burning.
3, the present invention adopts temperature directly to respond to the temperature of heat-generating disc, need not on heat-generating disc, to offer temperature sensing hole, need not again the insulation processing to be carried out in the both sides of thermistor, thereby effectively reduce processing cost, adopt simultaneously the temperature that heat-sensitive element is directly responded to heat-generating disc is set, but not cooking bottom temperature can effectively be avoided the temperature of heat-generating disc in the conventional art and the environment temperature temperature effect to thermistor, and temperature-sensitive is more accurate, use saferly, cost is lower.
So simultaneously; temperature measuring equipment of the present invention can prevent the dry combustion method of heat-generating disc; because the rising of the temperature of its heat-generating disc is exceedingly fast when the heat-generating disc dry combustion method; the temperature of traditional the bottom of a pan thermometric mode heat-generating disc when dry combustion method can rise to more than 300 ℃; and the temperature of thermistor is not high at this moment; thereby still be unlikely to power-off protection; so influence heat-generating disc service life; even cause that accident takes place; and the direct temperature survey at heat-generating disc of employing; the very fast temperature of perception heat-generating disc of thermistor when dry combustion method, thus make heat-generating disc dry combustion method temperature be unlikely to too high, can effectively prevent the generation of dry combustion method phenomenon.The present invention has result of use and security performance preferably through realizing proof.
Temperature measuring equipment of the present invention the experiment proved that, the present invention controls by the temperature of the direct perception heat-generating disc of heat-sensitive element, its effect is superior to have now greatly offers the frame mode that temperature sensing hole is controlled the temperature-sensitive of pot inner bag by temperature sensing device on heat-generating disc, can effectively prevent accident generations such as dry combustion method.
4, the present invention make product than traditional approach owing to reduced Hardware fitting, cost also greatly reduces.
Description of drawings
Fig. 1 prior art the pot inner bag at the bottom of with heat-generating disc contact-making surface schematic diagram when cold conditions
Fig. 2 prior art the pot inner bag at the bottom of with heat-generating disc contact-making surface schematic diagram in the time of 100 ℃
Fig. 3 prior art the pot inner bag at the bottom of with heat-generating disc contact-making surface schematic diagram in the time of 200 ℃
Fig. 4 prior art the pot inner bag at the bottom of with heat-generating disc contact-making surface schematic diagram in the time of 300 ℃
Fig. 5 is a kind of electric pressure cooker structure schematic diagram of the present invention;
Fig. 6 is heat-generating disc of the present invention and pot inner bag contact-making surface radian schematic diagram;
Fig. 7 is the planar structure schematic diagram of shell fragment assembly one parts;
Fig. 8 is the side direction structural representation of another parts of shell fragment assembly;
Fig. 9 is the structural representation of temperature control equipment part of the present invention;
Figure 10 is the installation sheet structural representation.
Description of reference numerals: 1, pot inner bag 2, inner cover 3, inner cover chassis 4, heat-generating disc 5, shell fragment assembly 6, support end 7, shrinkage pool 8, connecting rod (screw rod) 9, thermistor 10, installation sheet 11, control circuit
The specific embodiment
As Fig. 1-shown in Figure 4 be at the bottom of the pot inner bag of prior art with the schematic diagram of heat-generating disc contact-making surface when the cold conditions, 100 ℃, 200 ℃, 300 ℃ the time, when the normal temperature cold conditions at the bottom of its pot inner bag and the spacing between the heat-generating disc contact-making surface be 0, spacing when at 100 ℃ between it is 0.1mm, 200 ℃ of time intervals are 0.5mm, 300 ℃ of time intervals are 1mm, hence one can see that, and when not adopting compound the bottom of a pan structure, it is heated inhomogeneous.
As Fig. 5, Fig. 6, Fig. 7, shown in Figure 8, adopt electric pressure cooking saucepan at the bottom of the individual layer stainless-steel pan inner bag of the present invention to comprise pot cover (not shown), shell, pot inner bag 1, inner cover 2, inner cover chassis 3 and be arranged on heat-generating disc 4, control circuit on the inner cover chassis, pot inner bag 1 is the stainless steel single layer structure, the bottom of described heat-generating disc is provided with the feet more than three or three, and feet is equidistant to be arranged on the same circumference of heat-generating disc bottom; The isometrical uniform shell fragment assembly 5 more than three or three in corresponding heat-generating disc 4 bottoms, these shell fragment assembly 5 ends have support end 6, shell fragment assembly 5 upper middle position are provided with the shrinkage pool 7 that links to each other with heat-generating disc 4, the feet bottom is provided with screw, be fixed with connecting rod (screw rod) 8 on the screw, on this connecting rod 8, be serially connected with shell fragment assembly 5, it is by an arc 5-1 and a curved plates 5-2, the hole of opening on the inner cover 2 is passed in the connecting rod bottom, this aperture can slide connecting rod 8 greater than the diameter of connecting rod on inner cover 2; Be connected with inner cover chassis 3 with heat-generating disc 4 by screw rod (connecting rod) 8 that passes shrinkage pool 7, shell fragment assembly 5 is by being bolted on the inner cover chassis 3.
Stainless thermal coefficient of expansion is 10.3 * 10
-6Cm/cm/ ℃～17.3 * 10
-6M/m/ ℃, the thermal coefficient of expansion of aluminium is 24 * 10
-6M/m/ ℃.With the 304J113Cr-7.7Ni-2Cu stainless-steel pan courage that is suitable for making pot body is example, and its thermal coefficient of expansion is 17.3 * 10
-6M/m/ ℃, when temperature when 25 ℃ rise to 100 ℃, its size extends 0.13%.Through actual measurement and calculating, for the power electric cooker that is 900W, under the good situation of contact, with 5kg water during from 25 ℃ of burnings to 100 ℃, inner bag and heat-generating disc temperature and percentage elongation corresponding relation such as table 1, the foundation of this table are also controlled electric pressure cooking saucepan for detecting the heat-generating disc temperature, electric cooker provides foundation.
Table 1: inner bag and heat-generating disc temperature and percentage elongation corresponding relation
Under the room temperature, if when the cambered surface radius of stainless steel inner container and aluminium heat-generating disc is all 650mm, through actual measurement, the pot inner bag is carried out dry combustion method, when the temperature of heat-generating disc was 100 ℃, the arc of stainless steel inner container bottom surface top was 0.1mm with gap, heat-generating disc end face arc top; When the heat-generating disc temperature was 200 ℃, its gap was 0.5mm; When the heat-generating disc temperature was 300 ℃, the gap can reach 1mm.Obviously, under the room temperature at the bottom of the stainless steel inner container of equal cambered surface curvature and the aluminium heat-generating disc once being heated, the gap between both arcs tops constantly increases, and progressively becomes the line contact of periphery, and along with the increasing of heat-generating disc temperature, the contact condition of its cambered surface more worsens.The reason that produces this situation is that on the one hand aluminium heat-generating disc material is thicker, because each of thermal expansion be to uniformity, the cambered surface radius R1 of aluminium heat-generating disc increases, and its cambered surface is more smooth; More chief reason is that stainless steel inner container is thinner, being radially expanded the constraint that is subjected to periphery material of base material and epirelief diminishes R2.
As Fig. 6, for avoiding the deterioration of the inner bag the bottom of a pan and heat-generating disc contact condition, the cambered surface radius R2 of stainless-steel pan inner bag of the present invention bottom experiment showed, the best 5%-10% that is than the big 3%-30% of cambered surface radius R1 of heat-generating disc under the normal temperature.
The size of R1 and R2 is relevant with the bore of stainless steel inner container, R1 and R2 size.After adopting the scheme of R2 greater than R1, pot inner bag bottom contact at place, arc top with heat-generating disc before being heated, and is that a kind of small size contacts, and along with the rising of temperature, the cambered surface radius that both contact levels off to unanimity.With 5L pot inner bag is example, aluminium heat-generating disc cambered surface radius R1=630 under the normal temperature, and stainless steel inner container cambered surface radius R2=690, inner bag bore are 280, the cambered surface radius correspondence of different temperature points is as shown in table 2.
Table 2: the pot inner bag bottom and the heat-generating disc cambered surface radius corresponding relation of different temperatures corresponding points
From table 2 or to find out, heat-generating disc initial heat-up stage temperature rises fast, big with the temperature difference of pot inner bag, though this moment, both contacts area were less, but the heat transmission speed is fast, add the automatic aligning effect of heat-generating disc, guaranteed both closely knit contacts, the heat that heat-generating disc produces can in time conduct to inner bag.At hot stage, both contacts area increase, and the heat that heat-generating disc produces can conduct to stainless steel inner container equably, thereby avoids local burn-off phenomenon.
Described shell fragment assembly constitutes one group by two flexure strip sockets, can also be serially connected with many group shell fragment assemblies on this connecting rod.
As Fig. 9, shown in Figure 10, the temp detecting controller of electric heating pot of the present invention is made of the control circuit 11 that heat-sensitive element connects electric heating pot, this heat-sensitive element is a thermistor 9, it directly is fixed on the support end 6 of bottom of heat-generating disc 4, these support end 6 bottoms have screw, and heat-sensitive element thermistor 9 is fixed on this screw by installation sheet 10; As shown in Figure 6, this installation sheet 10 expands into " ten " font, and its opposite end has the hole, two holes is fixed on the screw of feet by screw, in addition the curved appearance thermistor of unpacking in two ends.Adopt the electric heating pot of temp detecting controller of the present invention to compare with the traditional electrical heating, as long as the temperature parameter in the control circuit is improved, the temperature parameter that the temperature parameter in the former induction the bottom of a pan is changed into heat-generating disc gets final product.
In the use, electric pressure cooking saucepan pot inner bag is placed in the inner cover, because heat-generating disc possesses the automatic aligning function, electric pressure cooking saucepan pot inner bag is contacted fully with the heat-generating disc surface, when the food materials of electric pressure cooking saucepan pot inner bag placement were inhomogeneous, deflection can take place in a pot inner bag, and shell fragment assembly meeting this moment is adjusting shell fragment height automatically, thereby reach poised state, make electric pressure cooking saucepan pot inner bag remain face and contact with the heat-generating disc surface.In heating process, because heat-generating disc 4 is different with the bloated coefficient of splashing of pot inner bag, adstante febre contacts electric pressure cooking saucepan pot inner bag and heat-generating disc surface maintenance face, thereby also can not produce the phenomenon of burnt meal on the basis of not using double-deck composite bottom boiler inner bag.
In the foregoing description, its thermistor is not limited to above-mentioned mounting means, also can adopt installing hole is set on heat-generating disc, is set directly in the hole etc.
Electric pressure cooking saucepan, the electric cooker of being applicable to of the present invention.
Claims (8)
1, a kind of electric pressure cooking saucepan, the temp detecting controller that comprises shell, pot cover, pot inner bag, heat-generating disc, electric pressure cooking saucepan, the pot inner bag is arranged on the top of heat-generating disc, described heat-generating disc is the aluminium heat-generating disc, it is characterized in that, this pot inner bag bottom be the stainless steel single layer structure, and described pot inner bag bottom is a cambered surface with the contact-making surface of heat-generating disc, the big 5%-10% of cambered surface radius of the radius ratio heat-generating disc of the contacting surface of pot inner bag bottom and heat-generating disc.
2, electric pressure cooking saucepan according to claim 1, it is characterized in that, the temp detecting controller of described electric pressure cooking saucepan is made of the control circuit that heat-sensitive element connects electric pressure cooking saucepan, this heat-sensitive element is fixed on the heat-generating disc, controls by the temperature of heat-sensitive element perception heat-generating disc.
3, electric pressure cooking saucepan according to claim 2 is characterized in that, described heat-generating disc bottom is provided with feet, and this feet bottom has screw, and heat-sensitive element is a thermistor, and thermistor directly is fixed on this screw by installation sheet.
4, electric pressure cooking saucepan according to claim 3 is characterized in that, this installation sheet expands into " ten " font, and its opposite end has the hole, two holes is fixed on the screw of feet by screw, and thermistor is contained in the two ends bending in addition.
5, electric pressure cooking saucepan according to claim 1, it is characterized in that, the bottom of described heat-generating disc is floating type syndeton, the bottom that this floating type syndeton is included in heat-generating disc is provided with the feet more than three or three, the feet bottom is provided with screw, is fixed with connecting rod on the screw, on this connecting rod resiliency supported is housed, the hole of opening on the inner cover is passed in support column connecting rod bottom, and this aperture, hole is greater than the diameter of connecting rod.
6, electric pressure cooking saucepan according to claim 5, it is characterized in that: the bottom that described floating type syndeton is included in heat-generating disc is provided with the feet more than three or three, the feet bottom is provided with screw, be fixed with connecting rod on the screw, on this connecting rod, be serially connected with the shell fragment assembly, the hole of opening on the inner cover is passed in the connecting rod bottom, and this aperture, hole is greater than the diameter of connecting rod.
7, electric pressure cooking saucepan according to claim 6 is characterized in that: described feet is equidistant to be arranged on the same circumference of heat-generating disc bottom.
8, electric pressure cooking saucepan according to claim 5 is characterized in that: described resiliency supported is the shell fragment assembly, constitutes one group by two flexure strip sockets, is serially connected with a group or more shell fragment assembly on this connecting rod.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101277191A CN100496350C (en) | 2007-06-12 | 2007-06-21 | Electric pressure cooker |
| PCT/CN2008/001132 WO2009000148A1 (en) | 2007-06-21 | 2008-06-12 | Electric pressure cooker and electric cooker |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710028553 | 2007-06-12 | ||
| CN200710028553.8 | 2007-06-12 | ||
| CNB2007101277191A CN100496350C (en) | 2007-06-12 | 2007-06-21 | Electric pressure cooker |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101901103A Division CN101579189B (en) | 2007-06-21 | 2007-06-21 | Electric rice cooker |
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| Publication Number | Publication Date |
|---|---|
| CN101133929A CN101133929A (en) | 2008-03-05 |
| CN100496350C true CN100496350C (en) | 2009-06-10 |
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ID=39158403
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101277191A Expired - Fee Related CN100496350C (en) | 2007-06-12 | 2007-06-21 | Electric pressure cooker |
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|---|---|
| CN101133929A (en) | 2008-03-05 |
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