CN2100830U

CN2100830U - Electric heating box

Info

Publication number: CN2100830U
Application number: CN 91215456
Authority: CN
Inventors: 王文超
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-05-14
Filing date: 1991-05-14
Publication date: 1992-04-08

Abstract

The utility model relates to an electric heating box. The film-shaped heater clamped by the heat conducting electric insulating layer is arranged below the heat transferring inner box so as to increase the relative capacity of the inner box. The film-shaped heater is connected with the commercial power through a bimetallic strip or a PTC temperature limiting piece, so as to simply realize temperature control and enhance power saving and safety. In addition, a reflecting film and the heat insulating material are positioned between the heating parts and the casing so as to improve heat efficiency. The utility model is suitable for the heating and thermal field, particularly as a portable electric cooker.

Description

Electric heating box

The utility model relates to the heater that utilizes electric energy, particularly about the improvement of boxlike electric heater.

The electric heater in past is normally in the bottom of its heat transfer piece or the heat generating member and the electric insulation spare of heating wire or heating coiling be set on every side.This kind structure, the heat generating member duty is big, and complicated, is unsuitable for making the Electric heating box as the lunch box size, and easy electric calorifie installation, does not generally limit temperature function.

The purpose of this utility model is to address the above problem, with simple structure provide the relative volume of a kind of inner box that conducts heat big, can limit temperature and the high Electric heating box of hot effect.

The utility model is achieved in that earlier forms shell with lid and outer box, shelve a size outside on the box suitably less than the heat transfer inner box of outer box, the joining place of box upper edge outside the heat transfer inner box rests, to be connected the slit and seal with a circle fluid sealant, thing flows into heating part by the slit in order to prevent to be heated.A membrane-like heater is set in addition again, and it is upper and lower on ， And is close to them at the bottom of the back of the body that is fixed on the heat transfer inner box with securing member with the electric insulation layer clamping of heat conduction respectively.In order to improve energy-conservation and security, membrane-like heater and being arranged between the power coupling on the outer box also is provided with the limit temperature part that utilizes bimetal leaf or PTC to make the limit temperature, and promptly the heater need are through limitting warm part and civil power to be electrically connected.In case heating-up temperature surpasses a certain value, just deenergization or make the approximate open circuit of energising.

In order further to improve the efficiency of heating surface, can also the interior case assembly of loading onto heater and outside the heat transfer reflectance coating is set between the box, the heat radiation of the outside box that looses is reflexed on the heat transfer inner box, fill out one deck heat-barrier material again between reflectance coating and the outer box, more help to improve the thermal efficiency.

The utility model is owing to adopt the heating arrangement of membrane-like heater and heat conduction electric insulation layer, and employing bimetal leaf or the such easy limit temperature part of PTC, so Electric heating box as compared with the past, its heat transfer inner box this body bulk relatively can be done greatly, and have realized the limit temperature function with simple structure.In addition, adopt reflectance coating and heat-barrier material can further improve the thermal efficiency again, thereby have well energy-conservation and security.

Fig. 1 is the outline drawing of the utility model one embodiment.

Fig. 2 is the cutaway view of the removal lid of Fig. 1 embodiment.

Fig. 3 is the right view of the outer box of quit a post and thus leave it vacant part of Fig. 1 embodiment.

Fig. 4 is the plane structure chart of the membrane-like heater of the utility model one embodiment.

Be described in further detail the utility model below in conjunction with accompanying drawing for embodiment.

Referring to Fig. 1, the lid 1 and the outer box 3 of present embodiment are made of plastic, profile such as common plastics lunch box.In order to allow lid 1 cover reality completely in use, place, the nearly upper edge of 3 liang of opposite side of box is provided with pinch roller clasp 2 respectively outside.The electric heating assembly (see figure 2) that is provided with in its box is made up of heat transfer inner box 4 membrane-like heaters 7, two layers of heat conduction electric insulation layer 6 and securing member 8.The limit, upper edge of heat transfer inner box is shelved on the upper edge of outer box 3, and the linking slit between them seals with a circle fluid sealant 5.Diaphragm heater 7 is selected the material between Jie Cr20Ni80 and the Cr25A15 for use, and And makes cabling pattern as shown in Figure 4 with the engraving method of printed wiring board using them.Two-layer mica sheet is used as heat conduction electric insulation layer 6, and membrane-like heater 7 in upper and lower clamping.Use the securing member of forming by screw, pressing plate, support etc. 8 again, diaphragm heater 7 and insulating barrier 6 are close to the back of the body that is fixed on heat transfer inner box 4 at the bottom of.Diaphragm heater 7 limits warm part 11 and the power coupling 12 that is contained on the outer box 3 to be electrically connected (see figure 3) through a bimetal leaf.When power coupling 12 is connected power supply, the bright lamp of its indicator lamp, electric current is contained in the outside of inner box 4 by in warm this example of part 11(of limit) and flowing through diaphragm heater 7, the ， And that makes it to generate heat conducts heat by mica sheet 6 and gives heat transfer inner box 4.When temperature reaches certain value, bimetal leaf 11 produces crooked deformation because of thermal coefficient of expansion is different, and power supply is disconnected, and bimetal leaf 11 can reclose power supply with the temperature recovery of shape that drops again.For improving the thermal efficiency, this example also electric heating assembly and outside the layer of metal foil material is set between the box 3 heat transfer reflectance coating 9(see Fig. 2) And this reflectance coating 9 and outside fill out one deck heat-barrier material 10 between the box 3, the heat of heating component downward radiation is also reflected is passed on the heat transfer inner box 4.

Claims

1, a kind of Electric heating box, comprise lid 1, outer box 3, heat transfer inner box 4 and power coupling 12, it is characterized in that: it also comprise a circle with heat transfer inner box 4 is connected with outer box 3 slit do the fluid sealant 5 of sealing, one utilize bimetal leaf or PTC element to make to limit the heat conduction electric insulation layer 6 of warm limit temperature part 11, one membrane-like heater 7, two layers of above-mentioned heater 7 of upper and lower clamping through limitting warm part 11 and power coupling 12 and being electrically connected and above-mentioned heater 7 and insulating barrier 6 be close to the back of the body that is fixed on heat transfer inner box 4 at the bottom of on securing member 8.

2, Electric heating box according to claim 1 is characterized in that: load onto between the interior case assembly and outer box 3 of heater, also be provided with one deck heat transfer reflectance coating 9, also be filled with one deck heat-barrier material 10 between reflectance coating 9 and the outer box 3.