JPH09271447A - Oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily bake various products in various baking patterns with an oven. SOLUTION: Concerning an oven 10 for heating an object 19 to be heated, a heat generating member 14 due to the eddy current of an induction heating means 11 is arranged near the object 19 to be heated and further, a heat source 16 is arranged at a position away from the object 19 to be heated. Moreover, an opening/closing shield panel 18 is arranged for shielding the heat source 16, and the face of this shield panel 18 is made into mirror face. Further, the induction heating means 11 has an induction heating coil 13 and the heat generating member 14 due to the eddy current, the induction heating coil 13 is arranged on the downside of a partition member 15, the heat generating member 14 due to the eddy current is arranged on the partition member 15, the object 19 to be heated is placed on the heat generating member 1 4 due to the eddy current, and ruggedness is formed on the upper face of the partition member 15.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oven,
In particular, the present invention relates to an oven capable of easily baking various products in a complicated baking pattern.

[0002]

2. Description of the Related Art Conventionally, an oven has been used for baking bread and the like. This oven generally uses a heater provided outside the upper and lower partition plates as a heating source. Basically, it is fired at a constant temperature, and the wall material uses a material with a large heat capacity.

[0003]

Therefore, in the above-mentioned conventional example, even if the temperature is controlled by the program-type control device, the practical range is very narrow, and it takes a lot of time to change the preheating or the set temperature. There was a drawback that running cost was required. Furthermore, since the temperature inside the furnace is controlled, when the number of products on the top plate and the initial temperature of the top plate are different, it is necessary to make fine adjustments with experience to obtain similar firing conditions. It Furthermore, even if the ovens of the same mechanism are used, if the material of the hearth is different, the heat transfer to the bread and the like will be different, so the compatibility between ovens was also low. Normally, the temperature of the entire furnace rises to about 200 ° C., so a large amount of heat leaks, which is uneconomical, and the work environment is deteriorated as a result of heating the workplace.
During the work, the high temperature part was exposed to a lot of areas that could come into contact with people, causing a safety problem such as burns.

Further, since there are different heating methods for the food to be heated, such as bread, which is the object of the food, it is better to gradually heat the food. For some foods, it is better to heat it gradually and weakly. Therefore, in order to give good quality to the heated food, it is necessary to bake according to the optimum conditions existing individually, and a baking oven for that purpose also requires a structure in which the baking conditions can be changed. Furthermore, if desired, a method is required in which the condition of the food to be baked is detected in real time and the conditions suitable for the condition are set appropriately. From the standpoint of workability, it is designed to be simple and easy to operate, smooth in preheating at the time of start-up, and in transitioning between setting changes, with little risk of burns, and a work environment-friendly design. Is desired. Further, in order to suppress the running cost, there is a problem to be solved in terms of economical efficiency. Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional example, to easily change the firing conditions of various objects to be heated, and to provide an economical and safe oven.

[0005]

In order to solve the above-mentioned problems, the structure of the first invention of the present invention is, in an oven for heating an object to be heated, by an eddy current of induction heating means in the vicinity of the object to be heated. In the oven, a heat generating member is arranged, and a heat source is arranged at a position apart from the object to be heated. According to the configuration of the first invention, the object to be heated (for example, a pan) is heated from its vicinity by the heat generating member by the eddy current of the induction heating means, so that the object to be heated can be directly heated and at a remote position. Since the object to be heated is heated by a heat source (for example, a heater), various heating conditions can be easily set.

Further, the structure of the second invention is that, in the structure of the first invention, an openable / closable shield plate for shielding the heat source is provided. With the configuration of the second aspect of the invention, in addition to the function of the first aspect of the invention, the heat source is shielded by the openable / closable shield plate, so that the rate at which the heat source contributes to the heating of the object to be heated can be instantaneously changed. Therefore, the heating condition can be instantly changed without changing the heat generation state of the heat source.

Further, the structure of the third invention is that, in the structure of the second invention, the surface of the shielding plate is a mirror surface. According to the configuration of the third invention, in addition to the function of the second invention, the surface of the shield plate is a mirror surface, and therefore the reflectance of the surface of the shield plate is high, so that the heat shield by the shield plate is facilitated.

Further, the structure of the fourth invention is the above first, second.
Alternatively, the induction heating means may include an induction heating coil and an eddy current heating member, the induction heating coil may be disposed below the partition member, and the eddy current heating member may be the partition member. The object to be heated is placed on the member, and the object to be heated is placed on the heat-generating member by the eddy current. With the configuration of the fourth invention, in addition to the operation of the first, second or third invention, the induction heating means has the induction heating coil and the heat generating member by the eddy current, and the induction heating coil is arranged below the partition member. Since the heat generating member generated by the eddy current is disposed on the partition member, the heat generating member generated by the eddy current is induction-heated by the AC magnetic flux generated by the induction heating coil passing through the heat generating member generated by the eddy current. Therefore, the object to be heated on the heat-generating member due to the eddy current as the top plate is directly heated from the top plate.

Further, the structure of the fifth invention is that in the structure of the above-mentioned fourth invention, unevenness is formed on the upper surface of the partition member. With the configuration of the fifth invention, in addition to the function of the fourth invention, the contact area between the heat generating member and the partition member due to the eddy current as the top plate becomes minute due to the unevenness of the upper surface of the partition member, so that the eddy current The heat of the heat-generating member due to is hard to be transferred to the partition member. For this reason, the amount of heat of the heat generating member that is transferred to the object to be heated due to the eddy current increases, so that the efficiency of heating the object to be heated is improved.

Further, the structure of the sixth invention is the structure of the first, second, third, fourth or fifth invention, wherein the temperature detecting means for detecting the temperature of the heat generating member due to the eddy current, and And a control means for controlling the detected temperature value.
With the configuration of the sixth invention, the first, second, third,
Along with the operation of the fourth or fifth aspect, the temperature detecting means detects the temperature of the heat generating member due to the eddy current, and the control means controls the detected temperature, so that the temperature of the heat generating member due to the eddy current is controlled to a predetermined value. It will be easier. In addition, if the difference in heat capacity between the filling such as bean jam and the bread dough that wraps it is large in breads with fillings etc., in the oven of the conventional structure, the set temperature is set high for thawing and baking in a short time. If you do this, only the dough and the dough surface will be overbaked while the filling is thawed and the temperature rise is insufficient.
If the filling is thawed and slowly thawed and baked at a low temperature in order to sufficiently raise the temperature, heating for a long time is required, which causes excessive drying of the dough due to evaporation of moisture in the dough, etc. Firing was very difficult. In the oven of the present invention, the temperature of the heat generating member (top plate) that directly heats the object to be heated can be increased in a short time by the induction heating by the eddy current. Since radiant heat and convective heat can all be controlled accurately, it is possible to thaw and bake in a much shorter time than before, under the condition that the baking color of bread dough can be controlled.

Further, the structure of the seventh invention is the same as the second,
In the configuration of the third, fourth, fifth or sixth invention, program control means is provided for controlling the heat generation amount of the heat source, the heat generation amount of the heat generating member by the eddy current by the induction heating coil, and the opening / closing of the shield plate by program control. Is. With the configuration of the seventh aspect of the invention, the program control means controls the heat source, the induction heating means, and the shield plate according to a predetermined program, so that various objects to be heated can be heated easily. In particular, by setting a program for each product such as bread, anyone can easily rebak with one touch,
It can be used by people who do not have knowledge of bread making methods, and the product lineup can be completed quickly.

[0012]

1 is a front view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG.
Shows a part of the BB cross-section structure of FIG. 2, FIG. 4 shows the side surface of the door of the embodiment, and FIG. 5 shows a modification of FIG. 1 to 5, the oven 10 relates to the embodiment of the present invention, and the oven 30 is
This is equivalent to the conventional example and is provided in a stacked state on the oven 10. In the oven 10, the induction heating means 11 is disposed below the object to be heated 19 (for example, bread), and the heater 16 as another heat source is the object to be heated 19.
Is arranged above. The induction heating means 11 includes an induction heating coil control device 12, an induction heating coil 13, and a top plate 14 as a heat generating member by eddy current. The induction heating coil control device 12 has an inverter, is arranged below the heat insulating material 25, and is connected so as to control the induction heating coil 13. The induction heating coil 13 is disposed below the hearth plate 15 as a partition member, and the top plate 14 is the hearth plate 15
Is placed on top. As shown in FIG. 5, if unevenness 15b is formed on the upper surface 15a of the hearth plate 15, the top plate 1
The heat generated in 4 becomes difficult to be transmitted to the hearth plate 15. In addition, the material of the hearth plate 15 is a stone plate (non-asbestos).

The shield plate 18 can be opened and closed like a blind by electric drive. When the shield plate 18 is closed, the heater 1 is closed.
A shield plate 18 can shield the space between 6 and the object to be heated 19. The surface of the shielding plate 18 is mirror-finished. The steam generation tanks 17a and 17b are arranged above the heater 16 and are heated. Steam generation tanks 17a, 17b
Water is generated from a solenoid valve (not shown) inside the steam generation tanks 17a, 17a.
It is injected into b and becomes vapor. Therefore, the steam generation tank 1
A steamed product can be produced by 7a and 17b. The exhaust hole 20a is a hole for exhausting the inside of the oven 10, and the damper 21a is arranged so as to open and close the exhaust hole 20a. The opening 22 is an entrance for putting the article to be heated 19 in and out of the oven 10, and the door 23 is for opening and closing the opening 22. The door 23 is made by fitting a heat resistant glass 23c into a metal door frame 23a.
The door 23 is opened when 3b is pulled. The illuminating lamp 24 is arranged in the recess 25 a on the side surface of the heat insulating material 25.

The program control means 26 controls the induction heating means 11 and the heater 16, opens and closes the shield plate 18, adjusts the flow rate of steam in the steam generation tanks 17a and 17b, and the exhaust damper 2.
All the operations of the oven 10 such as opening and closing of 1a and 21b are procedurally controlled in accordance with a time schedule arbitrarily set in advance by a program.
6 a is arranged on the front surface of the oven 10. The input means 26b such as a start switch, a stop switch, various data input keys for determining the firing conditions of the program,
It is arranged on the operation panel 26a. The top plate temperature sensor 27 measures the temperature of the top plate 14.
It is arranged so as to project from the central portion of the No. 5 toward the top plate 14 side. Further, the heater temperature sensor 28 is the heater 1
6, an internal temperature sensor 29 is provided in the oven 10 at a position away from the heater 16 and the top plate 14. The top plate temperature sensor 27, the heater temperature sensor 28, and the inside temperature sensor 29 are all thermocouples and are connected to the program control means 26.

As described above, the oven 30 corresponds to the conventional example, and the upper heater 31 and the lower heater 34 heat the object 38 to be heated. The steam generation tanks 32a and 32b are the steam generation tanks 17a and 1a described above.
It corresponds to 7b. Panel 3 that serves as a ceiling partition
3 is arranged below the heater 31. Hearth plate 36
The lower heater 34 is disposed on the lower side. In addition, between the hearth plate 36 and the lower heater 34, the heat conduction plate 35a,
35b is provided. The top plate 37 is arranged on the hearth plate 36, and the object to be heated 38 is placed on the top plate 37. The exhaust hole 40a corresponds to the above-mentioned exhaust hole 20a, and the exhaust damper 41a corresponds to the above-mentioned exhaust damper 21a. The opening 42 corresponds to the opening 22 described above, and the door 43 corresponds to the door 23 described above. Like the door 23, the door 43 includes a door frame 43a, a lever 43b, and a heat-resistant glass 43c.

The illuminating lamp 44 corresponds to the illuminating lamp 24 described above, and is disposed in the recess 45a of the heat insulating material 45. The program control means 46 corresponds to the above-mentioned program control means 26, and includes the top plate temperature sensor 3
9 is connected to the program control means 46. The operation panel 46a of the program control means 46 is provided with input means 46b such as an input key for firing condition data and a switch. The duct 50 is connected to the exhaust holes 20a and 40a described above. The fan 51 is installed at the tip of the duct 50 and forcibly discharges the exhaust gas inside the duct 50 to the outside. The suction port 52 of the duct 50 has the opening 2
It is formed above 2, 42. Leg 53 is oven 1
It is provided below 0. In addition, 54 is a floor surface.

With the above configuration, the oven 10 operates as shown in FIG. In FIG. 6, when the shield plate 18 is closed, the radiant heat reaching the object to be heated 19 is very small, and when the shield plate 18 is open, the radiant heat is about 95%, and convection from the air is generated. The heat is about 5%. Furthermore, when the alternating magnetic force lines 13a generated by the induction heating coil 13 pass through the top plate 14, an eddy current flows in the top plate 14, and Joule heat is generated by the eddy current. Therefore, the top plate 14
It itself becomes a heat generating member and heats an object to be heated (for example, bread dough) placed on the top plate 14. FIG. 7 shows a temperature rising pattern of the top plate (heating member) in contact with the object to be heated by the oven 10 of the present invention. In the example in the figure, about -20 at the start of firing
What was ℃ was raised to the set temperature of 120 ℃ in a short time, and the objects to be heated such as frozen bread dough were thawed in a short time.
Heat up to about 120 ° C. Further, since the temperature is maintained by the control device, coloring of the baking color is suppressed, and excessive baking of only the dough surface is prevented. On the other hand, in the conventional temperature rising pattern using only the oven 30, the temperature rise of both the top plate and the object to be heated is moderate. Therefore, when the oven of the present invention is used, the object to be heated is thawed in a very short time under the condition that the coloring of the baking color can be suppressed and controlled.
It became possible to bake.

FIG. 8 describes the operation of the conventional oven 30. In FIG. 8, the heater 31 heats the object 38 to be heated, and the heater 34 heats the top plate 37 from below. Radiant heat at this time is about 80%
The convective heat from the air is about 20% because the ambient temperature around the object to be heated is rising. The convection heat is greatly affected by the number of doughs placed on the top plate and the degree of opening of the door when putting it in and out of the oven, so that it requires skill in baking work.

As described above, in the present invention, the object to be heated 19 (for example, bread dough) is heated from its vicinity by the heat generating means 14 by the eddy current of the induction heating means 11, so that the object to be heated 19 can be directly heated. At the same time, since the object to be heated 19 is heated by the heater 16 as a heat source from a remote position, various heating conditions can be easily set. Further, since the heater 16 is shielded by the shield plate 18 that can be opened and closed, the rate at which the heater 16 contributes to the heating of the object to be heated 19 can be instantly changed. For this reason,
The heating condition can be instantly changed without changing the heat generation state of the heater 16. Further, since the surface of the shield plate 18 is a mirror surface, the reflectance of the surface of the shield plate is high, and thus the heat shield by the shield plate 18 is easy.

Further, the induction heating means 11 has an induction heating coil 13 and an eddy current heating member 14 serving as a top plate,
The induction heating coil 13 is arranged below the hearth plate 15 serving as a partition member, and the heat generating member 14 by eddy current is the furnace plate 15 described above.
Since it is disposed above, the AC magnetic flux generated by the induction heating coil 13 passes through the heat generating member 14 due to the eddy current, so that the heat generating member 14 due to the eddy current is induction heated. Therefore, the object to be heated 19 is directly heated from the heat generating member 14 by the eddy current as the top plate. Furthermore, the hearth plate 1
Since the contact area between the heating member 14 and the hearth plate 15 due to the eddy current as the top plate is small due to the unevenness 15b of the upper surface 15a of the No. 5, the heat of the heating member 14 due to the eddy current is generated by the hearth plate 1
It becomes difficult to reach 5. For this reason, the amount of heat of the heat-generating member 14 due to the eddy current that is transmitted to the object to be heated 19 increases, so that the efficiency of heating the object to be heated 19 is improved.

Further, the temperature of the heat-generating member 14 due to the eddy current is detected by the top plate temperature sensor 27, and the program control means 26 as the control means controls the detected temperature, so that the temperature of the heat-generating member 14 due to the eddy current is predetermined. Easy to control the value. Further, since the program control means 26 controls the induction heating means 11, the heater 16 and the shield plate 18 according to a predetermined program, it becomes easy to heat the object to be heated under various heating conditions. In particular, by setting a program for each product such as bread, anyone can easily rebak with one touch,
It can be used by people who do not have knowledge of bread making methods, and the product lineup can be completed quickly. Further, with regard to breads and the like containing filling and the like, thawing / baking is usually a difficult and difficult task, but the oven of the present invention allows anyone to easily thaw / bak. Although the heat source is the heater in the above-described embodiment, the heat source is not limited to this, and a gas flame or the like may be used as the heat source.

[0022]

According to the first aspect of the present invention, since the object to be heated can be heated by the heat source at a remote position and the object to be heated can be directly heated by the induction heating means, the object to be heated can be heated regardless of the temperature in the oven. The temperature of the heated product can be changed rapidly. Therefore, it becomes easy to heat the object to be heated under various heating conditions. In particular, since the temperature of the induction heating means and the temperature of the heat source can be raised and lowered independently of each other, it is impossible to heat the object to be heated in the conventional deck oven or the convection oven in which the upper heat and the lower heat cannot be adjusted. It has become possible to handle complicated baking methods such as baking of frozen dough for bean jam products. Further, in the conventional oven, even if the setting is similar, the compatibility of the setting firing conditions cannot be obtained between the ovens having different materials for the wall material of the oven, but in the oven according to the first invention, ,
Since induction heating conditions can be set in the vicinity of the object to be heated, it is versatile between different ovens.

Furthermore, since the induction heating is performed near the object to be heated, the heat energy generated by the induction heating hardly heats an extra object such as an oven wall, so that the top plate can be rapidly heated. Furthermore, it is possible to shift to the initial state of the next product firing in a time that is uncomparable to the conventional one, such as when preheating or switching products. Further, since the temperature of the hearth is usually about 60 to 100 ° C., even if it is touched by hand, there is no risk of burns if it is touched by hand, and safety is improved. Furthermore, the amount of heat leakage is small,
It has a work environment-friendly design. Furthermore, while the thermal efficiency of a normal sheathed heater is about 50%, the thermal efficiency of about 90% can be obtained by induction heating.
As described above, since the amount of heat leakage is small, running costs such as power consumption can be suppressed.

According to the second invention, in addition to the effect of the first invention, it is possible to instantaneously change the rate at which the heat source contributes to the heating of the object to be heated, regardless of the heat generation state of the heat source. It becomes easy to realize the heating condition. Furthermore, the effect of the shielding plate can be enhanced by the third invention. Further, according to the fourth invention, the first and second
Alternatively, together with the effect of the third invention, it is possible to realize an optimum configuration for inductively heating the object to be heated. Further, according to the fifth invention, in addition to the effect of the fourth invention, the amount of heat of the heat generating member that is transferred to the object to be heated due to the eddy current is increased, so that the efficiency of heating the object to be heated is improved. Further, according to the sixth invention, in addition to the effect of the first, second, third, fourth or fifth invention, it becomes easy to control the temperature of the heating conductive material to be a top plate to a predetermined value. . Furthermore, since the top plate can be heated by induction heating and the temperature of the top plate can be controlled, similar baking conditions can be obtained regardless of whether the temperature of the top plate before baking is high or low.

Further, according to the seventh invention, it becomes easy to heat the object to be heated under various heating conditions by the program control of the entire oven. Furthermore, since the firing conditions are all controlled according to a pre-input program,
Normal operation is simple by specifying the program number and pressing the start button. Furthermore, the temperature of the top plate, which is the majority of the heat that heats the object to be heated, the temperature of the radiant heat can always be optimally controlled, and the influence of convection heat hardly affects the number of products to be placed on the top plate. For example, even one is 10
Even if they are the same product, there is no need for fine adjustment.
Baking is possible with the program of the same number. For this reason,
Optimum baking conditions are given to the object to be heated, the quality of the heated food is improved, the work efficiency is improved, the efficient operating condition of the equipment is realized, and the work environment can be improved.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a part of the BB cross section of FIG.

FIG. 4 is a side view showing a door portion of the embodiment.

FIG. 5 is a cross-sectional view showing a modified example of the embodiment.

FIG. 6 is an operation explanatory diagram of the embodiment.

FIG. 7 is a graph showing characteristics of the above embodiment.

FIG. 8 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Oven 11 Induction heating means 12 Induction heating coil control device 13 Induction heating coil 14 Exothermic member by eddy current 15 Hearth plate 15a Upper surface of hearth plate 15b Roughness of upper surface of hearth plate 16 Heat source 18 Shielding plate 19 Heated object 26 Program control means 27 Top plate temperature detection means

Claims (7)

[Claims] 1. In an oven for heating an object to be heated, a heating member by an eddy current of induction heating means is arranged near the object to be heated, and a heat source is arranged at a position distant from the object to be heated. An oven characterized by. 2. The oven according to claim 1, further comprising an openable / closable shield plate for shielding the heat source. 3. The oven according to claim 2, wherein the surface of the shielding plate is a mirror surface. 4. The induction heating means has an induction heating coil and a heat generating member by an eddy current, the induction heating coil is arranged below the partition member, and the heat generating member by the eddy current is arranged on the partition member. The object to be heated is placed on the heat generating member by the eddy current.
Or the oven according to 3. 5. The oven according to claim 4, wherein unevenness is formed on the upper surface of the partition member. 6. The temperature detecting means for detecting the temperature of the heat generating member due to the eddy current, and the control means for controlling the detected temperature value are arranged.
Oven as described. 7. The amount of heat generated by the heat source is controlled by a program,
The oven according to claim 2, 3, 4, 5 or 6, further comprising a program control means for controlling the heat generation amount of the heat generating member and the opening / closing of the shield plate due to the eddy current generated by the induction heating coil.