GB2367887A

GB2367887A - Electric oven with heat radiation reflection device

Info

Publication number: GB2367887A
Application number: GB0024710A
Authority: GB
Inventors: Mindy Tsao
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-09
Filing date: 2000-10-09
Publication date: 2002-04-17
Also published as: FR2815698A3; DE20018923U1; GB0024710D0

Abstract

An electric oven with heat radiation reflection device, comprising a stainless steel panels (16) at the location between an upper thermoelectric tube (11) inside the electric oven and an upper steel plate (13) on an inner cover and the location between lower thermoelectric tube (12) and lower steel plate (14) on an inner cover. Because a stainless steel panel is perfect in reflection and its heat radiation suffers limited attenuation under a condition of high temperature, heat radiation is almost completely reflected to the food. As a result, the cost for the invention is low and the heating efficiency is greatly enhanced.

Description

Electric Oven with Heat Radiation Reflection Device

BACKGROUND OF THE INVENTION 1) FIELD OF THE INVENTION The invention related to a kind of electric oven with heat radiation reflection device, is especially to equip an upper stainless steel panel and a lower steel panel on an inner oven cover, respectively against a thermoelectric tube. The cost for the invention is low and heat radiation is reflected to food with 100 percents to greatly reduce energy loss.

2) DESCRIPTION OF THE PRIOR ART The design principle for a common electric oven is based on the central temperature (= 300oC ±10%) of the oven. The central temperature is the temperature of the spatial central position of an oven. Thus, food is quickly heated without risk of external high temperature.

Fig. I shows the structural isometric drawing of an electric oven of prior art. As shown in the figure, thermoelectric tubes (respectively divided as upper thermoelectric tube 11 and lower thermoelectric tube 12) in electric oven of prior art 1 is frequently placed near a steel plate on an inner cover (respectively divided as upper steel plate on an inner cover 13 and lower steel plate on an inner cover 14). The purpose of the design is to increase effective heating space and to respectively utilize heat radiation of the steel plates. Heat radiation reflected to the steel plates of inner cover (including upper steel plate on an

inner cover 13 and lower steel plate on an inner cover 14) is refracted to the food for energy loss reduction. However, the steel plates on an inner cover are near to a thermoelectric tube, the temperature is naturally higher that that in the center position. Normally, the work temperature of steel plates on an inner cover (including upper steel plate on an inner cover 13 and lower steel plate on an inner cover 14) is as high as 400 Oc to 450 Oc. Under such a high temperature, whether steel plates on an inner cover (including upper steel plate on an inner cover 13 and lower steel plate on an inner cover 14) can effectively reflect the infrared ray within heat radiation is an essential issue for work efficiency of an electric oven. The steel plates on an inner cover (including upper steel plate on an inner cover 13 and lower steel plate on an inner cover 14) for a common electric oven of prior art are mostly made of cheap steel plate with aluminum plated or zinc plate with aluminum plated.

The following figures illustrate reflection degree and work efficiency of an electric oven.

Fig. 2 shows variation data of infrared ray reflection ratio with a wave length of 5 um under various temperature conditions. As shown in the figure, the reflection ratio for a steel plate with aluminum plated is decreased to 48%, that for a zinc plate with aluminum plated is decreased to 8%, and that for a stainless steel plate is remaining between 98% to 99% at about 400 Oc.

From the data of in above figures and tables, because the steel plates on an

inner cover for a common electric oven of prior art are replaced by steel plate with aluminum plated or zinc plate with aluminum plated, reflection ratio is low under normal temperature. For a work temperature, which is as high as 400 oc, the reflection ratio is obviously decreased and relatively heating efficiency for the use of an electric oven is decreased. As a result, heating time for food is prolonged. The reason for reflection ratio decrease is mainly because the superficial layer plated of a steel plate is oxygenated under a high temperature of 400 oc. The change makes the surface of the steel plate no more shiny, smooth. The reflection ratio of the steel plate is also decreased. Even under normal temperature, the surface of the plate is no longer shiny. Thus, common electric ovens use low-cost electrically plated steel plates, the reflection ratio decreases after certain period of time. Heating time for food toast becomes longer and longer and energy waste is greatly increased. Moreover, due to poor reflection, it happens frequently that the lateral and sides of food are under-heated and the center portion is over-heated.

Also, as illustrated by the data in above figures and tables, the reflection ratio for a stainless steel plate is between 98 to 99 % with the advantage of nearly no reflection decrease. Although when all the steel plate on the inner cover of an electric oven are changed to stainless steel plates, the heating efficiency is greatly enhanced, the expensive cost may not be committed by the manufacturers and consumers.

Due to the above defectives and considerations, the inventor realized that there is a need for further study of product improvement and researched to overcome the disadvantages of prior products. Based on accumulated personal experience to the product, the inventor developed a kind of an electric oven with heat radiation reflection device mainly to equip a stainless steel plate between an thermoelectric tube inside an electric oven and a steel plate on inner cover. Through the property of extremely low heat reflection reduction for a stainless steel plate under high temperature, heat radiation is reflected to the food with nearly 100% reflection ratio. The heating efficiency for an electric oven is greatly increased with very low cost and effectively reduces energy loss as the characteristics of durable high reflection ratio for the invention.

SUMMARY OF THE INVENTION Thus, the objective of the invention is to design a kind of electric oven with heat radiation reflection device. It is mainly to equip a stainless steel plate between a thermoelectric tube inside a electric oven and a steel plate on inner cover. Through the property of extremely low heat reflection reduction for a stainless steel plate under high temperature, heat radiation is reflected to the food with nearly 100% reflection ratio. The heating efficiency for an electric oven is greatly increased with very low cost and effectively reduces energy loss as the characteristics of durable high reflection ratio for the invention.

The secondary objective of the invention is to bend the above stainless

steel plate in arch cross section. The reflection angle is pointed to the utmost inner and lateral side of a electric oven to heat food evenly.

To achieve the above objective, the invention designs a kind of electric oven with heat radiation reflection device. It is mainly to equip stainless steel plates respectively at the location between upper thermoelectric tube and the upper steel plate on the inner cover and that between lower thermoelectric tube and the lower steel plate on the inner cover. Through the property of extremely low heat reflection reduction for a stainless steel plate under high temperature, heat radiation is reflected to the food with nearly 100% reflection ratio. The heating efficiency for an electric oven is greatly increased with very low cost and effectively reduces energy loss as the characteristics of durable high reflection ratio for the invention. Also, the above stainless steel plate is bent in arch cross section. The reflection angle is pointed to the utmost inner and lateral side of a electric oven to heat food evenly.

The followings are brief description for optimal embodiments of the invention for committee's better understanding in the structural assembly and operations of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural isometric drawing for a electric oven of prior art.

Fig. 2 is variation data of reflection ratio for remote infrared ray with a wave length of 5 um for various kinds of steel plates under various

temperature conditions.

Fig. 3 is a structural exploded drawing of the invention.

Fig. 4 is a partial structural drawing of the invention.

Fig. 5 is a drawing of embodiment for the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Fig. 3 and Fig. 4 respectively show the structural exploded drawing and partial structural drawing of the invention. As shown in the above figures, the invention, a electric oven with heat radiation reflection device, is mainly to equip stainless steel plate 2 respectively at the location between upper thermoelectric tube 11 inside electric oven 1 and the upper steel plate on the inner cover 13 and that between lower thermoelectric tube 12 and the lower steel plate on the inner cover 14. Stainless steel panel 2 is bent in arch cross section to aim the utmost inner and lateral side of electric oven 1. Stainless steel panel 2 equips extruded panels 21 at both ends. Extruded panels 21 penetrate the reserved holes 16 on steel plate 15 of the inner cover and are folded for fixture.

As shown in the data of Fig. 2, the reflection ratio of a stainless steel

under a temperature of 100 Oc is about 98 to 99%. When the temperature rises to 400 oc, the reflection ratio is remaining between 98 to 99% without decrease phenomenon. Thus, by the use of stainless steel panel 2 closing the top edge of upper thermoelectric tube 11 and bottom edge of lower thermoelectric tube 12,

high reflection ratio effect is achieved.

Please refer Fig. 5, a drawing of embodiment for the invention. As shown in the figure, by utilizing the property that the reflection ratio of a stainless steel panel 2 is very high and it is not decreased under high temperature condition, the heat radiation (i. e. remote infrared ray) generated by upper thermoelectric tube 11 and lower thermoelectric tube 12 is reflected to the food with nearly 100% reflection ratio. Heating efficiency for electric oven I is greatly increased with very low cost and effectively reduces energy loss as the characteristics of durable high reflection ratio for the invention.

Moreover, because stainless steel panel 2 is designed in arch cross section. It aims reflection angle to the utmost inner and lateral side of electric oven I to make even the diversification of heat degree against food due to various distances. The heat radiation reflected from stainless steel panel 2 is concentrated at the interior and lateral sides of the food for even heating.

On the basis of the above particular design, the invention is characterized as follows: 1. Eliminate the defectives that the reflection ratio of an electroplated steel plate inside a common electric oven decreases and also effectively solve the problem that the reflection ratio of partial electroplated steel plates is poor.

2. The quantity of stainless steel panel 2 is reduced and the increased cost is minor. Cost issue can thus be ignored.

3. Enhance the reflection ratio of remote infrared ray to greatly shorten heating time period for food, to relatively save electric power and effectively reduce energy loss.

4. Due to the design of various reflection angles for stainless steel panel 2, heat radiation is reflected to the inner and lateral sides of food without decaying. Thus, food is evenly heated to solve the problem that food is unevenly heated for a common electric oven.

On the basis of the above description, heat radiation reflection device for the invention, a electric oven, is developed to improve the defectives for common electric oven. Although the invention illustrates an optimal embodiment of the invention, the extent of patent for the invention should not be thus limited. Any further modification and minor change should be considered as the patent application area based on the spirit of the invention.

The above explanation is a substantial embodiment of the invention, which provides greater practical performance than products of prior art. Furthermore, the present invention meets all new patent application requirements and is lawfully submitted for review and the granting of the commensurate patent rights to thereby encourage the spirit of invention and its rightful protection under the patent law.

Claims

1 The invention, a kind of electric oven with heat radiation reflection device, is primarily to equip a stainless steel panel respectively at the location between upper thermoelectric tube inside an electric oven and a upper steel plate on an inner cover and the location between lower thermoelectric tube and lower steel plate on an inner cover; furthermore, by the use of property that a stainless steel panel is perfect in reflection and its heat radiation is nearly not decayed under a condition of high temperature, heat radiation is almost reflected to the food at 100 percents ; thus the cost for the invention is low and the heating efficiency is greatly enhanced, also, it effectively limits energy loss, relatively saves electricity wasting, and is durable with high heat radiation reflection.

2 As mentioned in Claim 1 of a kind of electric oven with heat radiation reflection device equips a stainless steel panel in arch cross section to aim reflection angle at the utmost inner and lateral sides of the oven for even food heating.

3 As mentioned in Claim 1 of a kind of electric oven with heat radiation reflection device equips an extruded panel at both ends of a stainless steel panel, of which the extruded panel penetrates a reserved hole on the steel plate of the inner cover and is folded for fixture.

4 An electric oven with heat radiation reflection device substantially as hereinbefore described with reference to and as illustrated in figures 3 to 5 of the accompanying drawings.