JP2941727B2 - Oven structure and method of heating oven heating chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oven structure capable of satisfactorily heating an object to be heated and a technique for heating an oven heating chamber. More specifically, for example, a large number of doughs are baked under the same conditions. The present invention relates to an oven structure capable of obtaining bread having the same baking condition, and a method of heating an oven heating chamber.

[0002]

2. Description of the Related Art In conventional ovens, mainly fixed ovens, the temperature of the upper and lower surfaces of the heating chamber is indicated by the ambient temperature of a sensor in the heating chamber near each wall, and the set value is fixed. Even if the measurement position of the sensor changes even in the oven set as above, the indicated temperature may be different. Further, even when the same set value is used in the same oven, the heating intensity may be different each time the product is fired. That is, the heating of the heating chamber based on the ambient temperature has low stability of the firing conditions.

[0003] In addition, the ceiling surface and the hearth surface in the heating chamber are subjected to a surface treatment having a high emissivity in order to increase radiant heat. As a result, the ceiling surface for controlling the overheating has a hearth temperature. The furnace floor, which controls the lower fire, is also greatly affected by the temperature of the ceiling.
For this reason, even if it is desired to lower only the upper fire, it is impossible to set the upper fire below a certain level if the lower fire setting is high. If the fire setting was high, it was not possible to set the lower fire below a certain level. That is, there is a very narrow limit on the firing temperature range that can be set.

[0004]

Therefore, when the object to be heated is stably heated under various heating conditions in the above-mentioned conventional oven, it is determined whether or not the object can be used at the indicated temperature. is necessary. When using the conventional oven for the first time after preheating in the heating chamber, it is necessary to allow time for the heating chamber temperature to stabilize. During this time, even if the temperature set as the indoor temperature is displayed, the original firing Conditions could not be obtained.

[0005] The conventional fixed type oven, due to its structure,
The heat transfer from the ceiling surface is radiant heat and the heat transfer from the hearth surface is conduction heat, and the amount of heat transfer to the object to be heated depends substantially on the temperature of the ceiling wall and the hearth. However, even if approximate temperature control is possible by detecting the temperature in the vicinity of the temperature without directly detecting the temperature at the location that directly affects the heating, there will be a considerable gap from the actual temperature. In some cases, the desired heating may not be possible. When the operation rate of the oven is actually increased and the object to be heated is continuously heated, the burning color of the heated product may not be constant.

Accordingly, a first object of the present invention is to solve the above-mentioned disadvantages of the conventional oven and to provide an oven structure capable of accurately obtaining the original heating conditions such as firing. It is in.

A second object of the present invention is to provide a method for heating an oven heating chamber, which can accurately obtain the original heating conditions such as firing.

[0008]

According to a first aspect of the present invention, a heating chamber includes a ceiling plate, a hearth plate and side plates, and a door.
An oven in which heating means are provided outside the ceiling plate and the hearth plate, and the heating chamber is heated by these heating means. And heated to a predetermined temperature.

According to the first aspect of the present invention, the heating chamber is heated by the heating means outside the ceiling plate and the heating means outside the hearth plate. The heating means on the ceiling panel side controls the temperature of the ceiling panel,
The heating means on the hearth plate side detects the temperature of the hearth plate, controls the heating conditions of each heating means, and heats the heating chamber to a predetermined temperature.

In order to solve the above-mentioned first problem, the oven structure according to the second aspect of the present invention is the oven structure according to the first aspect, wherein the upper surface of the hearth plate is subjected to a surface treatment having a high thermal reflectance and the lower surface is radiated. It is characterized by high surface treatment.

According to the second aspect of the present invention, the upper surface of the hearth plate is subjected to a surface treatment for increasing the heat reflectance, and the lower side of the hearth plate is subjected to a surface treatment for increasing the emissivity. The heating means (upper fire) outside the ceiling plate and the heating means (lower fire) outside the hearth plate can be independently controlled without interference of the hearth surface temperatures.

A method for heating an oven heating chamber according to a third aspect of the present invention for solving the second problem is as follows.
The temperature of the ceiling plate and the hearth plate is detected when the heating chamber of the oven, which is constituted by the ceiling plate, the hearth plate and the side plate, and the door, is heated to a predetermined temperature by each heating means disposed outside the ceiling plate and the hearth plate. And controlling the temperature of each heating means.

According to the third aspect of the present invention, the heating chamber is heated by detecting the temperatures of the ceiling plate and the hearth plate, and controlling the heating means outside the ceiling plate and the heating means outside the hearth plate.

According to a fourth aspect of the present invention, there is provided a method of heating an oven heating chamber, wherein the upper surface of the hearth plate is subjected to a surface treatment having a high heat reflectance and the lower surface is a surface having a high radiation rate. It is characterized by being processed.

According to the fourth aspect of the present invention, the heating means outside the ceiling plate and the heating means outside the hearth plate can be controlled independently.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an oven used in each embodiment of the present invention will be described. This oven is
It has the structure shown in FIG. The heating chamber 2 of the oven 1 mainly includes a ceiling plate 3, a hearth plate 4, side plates 5, and a door 6. The upper portion of the ceiling plate 3 and the lower portion of the hearth plate 4 are covered with a heat-resistant plate 7 to form predetermined spaces 10 and 11 in which electric heaters 8 and 9 are arranged. The side plate 5 is made of a heat-resistant material, and the door 6 is fitted with a heat-resistant glass 6A. An exhaust duct 12 is provided in a part of the side plate 5.

Electric heaters 8 and 9 are provided on the back side of each of the ceiling plate 3 and the hearth plate 4. Temperature sensor 1 for ceiling surface
3 (for example, a thermocouple) is attached to the lower surface of the ceiling surface. Note that the temperature sensor 13 for the ceiling surface may be embedded in the ceiling plate 3. A temperature sensor 14 (for example, a thermocouple) for the hearth is attached to the surface of the hearth plate 4. The hearth temperature sensor 14 may be embedded in the hearth plate 4. The electric heater 8 on the side of the ceiling plate 3 (for the upper fire) is controlled to be turned on and off in accordance with an instruction from the temperature sensor 13 on the ceiling surface. When the electric heater 8 is set at a predetermined set temperature, heat is generated at the predetermined temperature. The electric heater 9 on the hearth plate 4 side (for lower fire) is on / off controlled by an instruction from the temperature sensor 14 on the hearth surface, and when set to a predetermined set temperature, generates heat to the predetermined temperature.

In the present embodiment, as shown in FIG. 2B, an aluminum foil 15 is attached to the upper surface of the hearth plate 4 as a mirror surface treatment having a high thermal reflectance in order to suppress the transfer of radiant heat. As shown in FIG. 2 (B), the lower surface of the hearth plate 4 was subjected to a black coating treatment 16 having a high emissivity so as to easily absorb the radiant heat from the electric heater 9.

Next, the first embodiment of the present invention will be described with reference to a test example relating to the control of the upper fire in the case of baking with the above-mentioned oven and a conventional oven. In addition,
Conventional ovens have a structure in which a temperature sensor is measured at the ambient temperature of the heating chamber. Baking method and each sample S,
The method of controlling the oven in which C was fired is as follows.

[0020] The mixture of the above-mentioned raw materials was treated as follows to obtain a medium seed dough. a Manufacturing method (medium seed dough) Mixing time, low speed 3 minutes, medium speed 2 minutes Kneading temperature 24.0 ° C Fermentation time 2 hours This was processed to obtain dough for confectionery bread.

[0021] b Manufacturing method Mix all raw materials except fats and oils in medium seed Mixing time, 3 minutes at low speed, 3 minutes at medium speed Add fats and oils Mixing time, 3 minutes at low speed, 6 minutes at medium speed Kneading temperature 28.0 ° C Floor time 1 hour Split weight 80g Bench time 15 minutes Shaping Degas and extend into a rod shape Proofer 60 minutes

Oven Control Method Sample C was a sample (meaning oven) in which the ambient temperature at a position below the ceiling surface was measured and controlled. The sample S was obtained by measuring and controlling the temperature of the ceiling surface. The baking of the dough for confectionery bread after the heating was performed as follows. Firing temperature Sample C: upper flame: 220 ° C / lower heat 220 ° C Firing temperature Sample S: upper flame: 220 ° C / lower heat 220 ° C Firing time 8 minutes Firing of the upper surface of bread products baked by various fire control methods. Table 3 shows the results of measuring the color (brightness).

[0023]

As is clear from Table 3, when the first firing was performed immediately after the temperature in the heating chamber 2 reached the set temperature (test section I), the samples C and C were compared with those in the stable state. S
Both had different firing colors. However, when the product is continuously fired, the baking color becomes darker in the conventional control method, but the baking color in the upper fire control method according to the present embodiment is equivalent to that in the case of baking in a substantially stable state. Color could be obtained.

Next, in the second embodiment, the baking color (brightness) of the bottom surface of the baked bread product was measured by the method of controlling the lower heat when the bread was baked in the oven described above and the conventional oven. The results were as shown in Table 4. In addition, the control method of the oven which baked each sample, and the baking method are as follows.

Oven Control Method Sample C-1 was obtained by measuring and controlling the ambient temperature at a position below the hearth plate (a conventional oven). Sample S-1
Indicates the temperature of the hearth plate 4 measured and controlled.

Baking method The composition other than the following and the manufacturing method are the same as in Example 1. Firing temperature Sample C-1 is upper fire: 220 ° C / lower heat 220 ° C Firing temperature Sample S-1 is upper fire: 220 ° C / lower heat 255 ° C Firing time 8 minutes

[0028]

As can be seen from Table 4, in the conventional control method, immediately after the heating chamber temperature reaches the set temperature, the firing color is darker than in the case of firing in a stable state, and the product is continuously fired. In this case, the burning color becomes lighter. On the other hand, in the control method of the lower fire according to the second embodiment S-1, it was possible to obtain the same burning color as in the case of baking in a substantially stable state in any of the test sections.

Next, the third embodiment will be described with reference to a test example in which bread is baked in an oven of a hearth with a surface treatment. In addition, the state of the hearth of the oven where each sample was fired,
The baking method is as follows.

Oven hearth state Sample C-10 is in a normal state (slate plate: emissivity)
Large) (conventional oven). For the sample S-10, the hearth is subjected to a surface treatment for suppressing the emissivity. That is, an aluminum wheel was laid on the hearth, and the test was performed by cutting off the radiant heat from the hearth.

Baking method The composition other than the following and the manufacturing method are the same as in Example 1. Sample One loaf bread (divided weight = 450 g) Baking time 25 minutes Baking temperature See the results in Table 5. Table 5 shows the results of measuring the baking color (brightness) of the top surface of bread products baked in a hearth oven by various surface treatment methods. It was as follows.

[0033] As is clear from the results in Table 5, in the oven of the third embodiment in which the emissivity of the hearth was suppressed, stable firing conditions were obtained without the upper fire being affected by the lower fire setting. Was.

[0034]

According to the oven structure of the present invention, the temperature of the ceiling plate and the hearth plate are detected and the heating means on the outside of the ceiling plate and the hearth plate are controlled to accurately control the heating chamber. Since heating is performed, the object to be heated can be favorably heated.

According to the second aspect of the present invention, it is possible to accurately heat the heating chamber by independently controlling the heating means without interfering the temperature of the ceiling surface and the temperature of the furnace floor surface. it can.

According to a third aspect of the present invention, in the heating method of the oven heating chamber, the temperatures of the ceiling plate and the hearth plate are detected, and the heating means on the outside of the ceiling plate and the outside of the hearth plate are controlled and heated. Therefore, the heating chamber can be accurately heated, and the object to be heated can be favorably heated.

According to the fourth aspect of the present invention, the heating chamber can be controlled independently by the respective heating means and accurately heated without causing the temperature of the ceiling surface and the temperature of the hearth surface to interfere with each other. .

[Brief description of the drawings]

FIG. 1 is a sectional view of an oven structure according to an embodiment of the present invention.

2A is an enlarged sectional view of a ceiling plate, and FIG. 2B is an enlarged sectional view of a hearth plate.

FIG. 3 is a schematic view showing a ceiling surface of an oven heating chamber and a position of a temperature sensor.

FIG. 4 is a diagram showing a furnace floor surface of an oven heating chamber and positions of temperature sensors.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oven 2 Heating room 3 Ceiling plate 4 Hearth plate 8, 9 Electric heater 13, 14 Temperature sensor 15 Aluminum foil 16 Black paint processing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F24C 7/04 301 F24C 7/02 531 A47J 37/06-37/08

Claims (4)

(57) [Claims] A heating chamber is constituted by a ceiling plate, a hearth plate, a side plate, and a door, each heating means is arranged outside the ceiling plate and the hearth plate, and the heating chamber is heated by these heating means. An oven structure wherein the heating chamber is configured to detect temperatures of a ceiling plate and a hearth plate to control each of the heating means and to be heated to a predetermined temperature. 2. The oven structure according to claim 1, wherein the hearth plate has an upper surface subjected to a surface treatment having a high thermal reflectance and a lower surface subjected to a surface treatment having a high emissivity. 3. When heating a heating chamber of an oven, which is constituted by a ceiling plate, a hearth plate, a side plate, and a door, to a predetermined temperature by each heating means disposed outside the ceiling plate and the hearth plate, A method for heating an oven heating chamber, comprising detecting a temperature of a floor plate and controlling a temperature of each of the heating means. 4. The method for heating an oven heating chamber according to claim 3, wherein the hearth plate is subjected to a surface treatment with a high heat reflectance on the upper surface and a surface treatment with a high radiation rate on the lower surface.