JPH09170761A - Convection oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convection oven (including a steam convection oven) in which a thermal radiation and a heat loss through a glass window of a door out of the convection oven can be fundamentally reduced. SOLUTION: In a convection oven 1, a door 5 of a heating housing for heating and cooking a cooked item is provided with a shutter 43 covering a glass window 33 of the door 5. In the case that it is not necessary to see a state of cooking, the shutter is lowered and in the case that it is desired to see an inside part of the heating housing, the shutter is lifted up and then an operator can see the inside part of the heating housing. When the shutter 43 is lowered, it is possible to reduce thermal radiation or heat transfer loss from the heating housing to the outside part. With such an arrangement as above, an irregular distribution of temperature within the heating housing or irregular burning at the cooked item within the heating housing is eliminated and at the same time consumed fuel in an oven can be reduced and a countermeasure against environment in a kitchen can also be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convection oven (including a steam convection oven) that heats and cooks a food while circulatingly heating an atmosphere in a heating chamber. In particular, the present invention relates to a convection oven which is improved to eliminate temperature unevenness in a heating chamber due to heat radiation from a glass window of a door to the outside.

[0002]

2. Description of the Related Art FIG. 2 is a plan sectional view showing the internal structure of a conventional general convection oven. The inside of the convection oven 1'of FIG. 2 is a heating cabinet 3 for heating and cooking food. Inside the heating chamber 3, the filter plate 1
At the boundary of 1, the hotel bread storage section 3a on the right side and the heating blower section 3b on the left side are divided. The central portion of the filter plate 11 is a wire mesh filter. In the hotel bread storage 3a, the hotel bread 7 on which the food 9 is placed is placed vertically. A fan 13 and a heat exchange tube 17 are installed in the heated air blower 3b.

The fan 13 is a centrifugal fan such as a so-called sirocco fan, is rotationally driven by a motor 15, sucks wind from the right side surface of its central portion, and blows out wind from its outer peripheral surface. Therefore, the atmosphere inside the hotel bread storage portion 3a is sucked into the fan 13 from the central portion of the filter plate 11, blown out to the outer periphery (upper and lower sides of the drawing) of the fan 13, and the heat exchange tube through which the exhaust gas of the gas burner passes. After being heated by the 17th group, from the hot air passage 21 outside the filter plate 11 (upper and lower in the figure) to the hotel bread storage 3
It is blown into a. The hot air heats the inside of the refrigerator, and the convection heat and radiant heat heat the food. The hot air blown into the chamber is again sucked into the fan 13 from the central portion of the filter plate 11 and circulates in the heating chamber 3. The temperature of the hot air is detected by the temperature sensor 19 beside the hot air passage 21. Then, the combustion of the gas burner (not shown) is controlled to bring the internal temperature to the set temperature. In addition, fan 1
The wind strength (rotation speed) of 3 can be selected from two levels of strength (early / late). Furthermore, in recent years, steam convection ovens equipped with boilers that blow steam into
It is becoming popular in the food and drink industry due to its good cooking efficiency and wide variety of dishes.

FIG. 3 is a front view of the conventional convection oven of FIG. A door 5 and an operation panel 31 are provided in front of the convection oven 1 '. The door 5 is for loading / unloading the cooked food 9 into / from the heating chamber 3 (actually, every hotel bread 7). The door 5 rotates in the front direction around the right side of the door 5. A glass window 33 is fitted in the central portion of the door 5 so that the inside 3 of the heating chamber can be seen. This is to help determine the quality of cooking by looking at the color and surface condition of the food item 9.
The operation panel 31 is provided with a cooking start / stop button, a temperature setting dial, a cooking time setting dial, a fan strength selection button, and the like.

[0005]

In the conventional convection oven shown in FIGS. 2 and 3, the heat radiation from the glass window portion of the door to the outside is large, and a serious heat loss occurs. Therefore, the temperature of the heating chamber inside the door was lower than that of the other parts (for example, 185 to 190 ° C when the internal temperature was 200 ° C). That is, the temperature unevenness was generated in the heating chamber. This uneven temperature inside the refrigerator led to uneven cooking.

In order to reduce the heat radiation and heat loss of the glass window of the door, there is a convection oven in which the glass is doubled. That is, for example, two pieces of glass having a wall thickness of 7 mm are attached to the window at intervals of 20 to 30 mm. By doing this, heat loss is 50%
It can be lowered. However, although this double glass door is expensive (about twice as much as a normal door), it has little effect of reducing heat loss.

An object of the present invention is to provide a convection oven (including a steam convection oven) capable of drastically reducing heat radiation and heat loss from a glass window of a door to the outside.

[0008]

In order to solve the above-mentioned problems, the convection oven of the present invention has a heating cabinet for heating and cooking food, a means for circulatingly heating the atmosphere in the heating cabinet, and a glass window. A convection oven comprising: a door of a heating chamber; and a shutter for covering a glass window of the door. That is, the shutter was provided on the glass window of the oven door. Then, when it is not necessary to see the cooking state (inside the heating cabinet), the shutter can be lowered, and when the inside of the heating cabinet is desired to be viewed, the shutter can be raised and the inside can be viewed as usual.

If the inner surface of the shutter is of a white color that reflects heat radiation, and the main body is made of a material having a good heat insulating property such as a porous plastic plate, the heat from the heating chamber to the outside can be reduced. Radiation and heat transfer loss can be drastically reduced. As a result, uneven temperature in the heating chamber and accompanying uneven baking of the cooked food can be eliminated, and the fuel consumption of the oven can be reduced and the environment of the kitchen can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a more detailed description will be given with reference to the drawings. FIG. 1 is a diagram showing a front portion of a convection oven (steam convection oven) according to an embodiment of the present invention. (A) is a front view of the whole and (B) is a side view of a door and a shutter. The convection oven 1 shown in FIG. 1 is similar to the conventional convection oven 1 ′ shown in FIG. 2 in terms of the structure inside the heating chamber and the switch arrangement of the operation panel 31. However, the difference is that the shutter 43 is provided in front of the door 5.

The shutter 43 is provided outside the glass window 33 so as to cover the entire glass window 33. The shutter 43 is made of a flexible sheet material, and is preferably a roll curtain or a silky curtain (corrosion resistant aluminum alloy). Further, it is preferable that the inner surface thereof is coated with a white heat-resistant paint that easily reflects heat radiation.

The shutter 43 is housed in a shutter housing section 51 provided above the glass window 33 so that it can be pulled out and rolled up. Inside the shutter housing portion 51, there is provided a winding core rod 51 which is biased in the winding rotation direction, and the shutter 43 is attached to the winding core rod 51.
Is connected at the upper end. At both ends of the winding core rod 51, rotation urging means (not shown) (such as a winding spring of a seat belt of an automobile) is installed, and the winding core rod 51 is rotated clockwise in FIG. 1 (B). It is urged to rotate. A bar 47, which is slightly wider than the shutter 43, is attached to the lower end (tip) of the shutter 43.

When the shutter 43 is positioned in front of the glass window 33, the user holds the bar 47 at the tip of the shutter 43 by hand and pulls out the shutter 43 from the shutter housing section 41. Then, both ends of the bar 47 are hooked on hooks 45 (bently bent downward) provided on both sides of the lower side of the door 5, and the shutter 43 is fixed while being opened. On the other hand, when removing the shutter 43 from the front surface of the glass window 33, if the bar 47 at the lower end of the shutter 43 is held by hand and detached from the hook 45, the hand is released.
The shutter 43 is naturally caught in the storage unit 41.

[0014]

As is apparent from the above description, in the convection oven of the present invention, when it is not necessary to see the cooking state (inside the heating chamber), the shutter is lowered, and radiation from the glass window and loss of heat are lost. It is possible to prevent the temperature unevenness in the refrigerator. On the other hand, if you want to look inside the heating cabinet,
You can raise the shutter to see inside as before.
Furthermore, if the inner surface of the shutter is of a white color that reflects heat radiation, and the body is made of a material with good heat insulation such as a porous plastic plate, heat radiation from the heating cabinet to the outside And heat transfer loss can be drastically reduced. Therefore, the temperature unevenness in the heating chamber and the accompanying uneven baking of the cooked food can be eliminated, and the fuel consumption of the oven can be reduced and the kitchen environment can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front portion of a convection oven according to an embodiment of the present invention. (A) is a front view of the whole and (B) is a side view of a door and a shutter.

FIG. 2 is a plan sectional view showing an internal structure of a conventional general convection oven.

FIG. 3 is a front view of the conventional convection oven of FIG.

[Explanation of symbols]

1 Convection Oven 3 Heating Cabinet 3a Hotel Pan Storage Section 3b Heating / Blower Section 5 Door 7 Hotel Pan 9 Cooked Goods 11 Filter Plate 13 Centrifugal Fan 15 Motor 17 Heat Exchange Tube (Exhaust Pipe) 19 Temperature Sensor 21 Hot Air Passage 31 Operation Panel 33 Glass Window 41 Shutter compartment 43 Shutter 45 Hook 47 Bar 51 Wrap-up core rod

Claims (2)

[Claims] 1. A convection oven comprising a heating cabinet for heating and cooking food, means for circulating and heating the atmosphere in the heating cabinet, and a heating cabinet door having a glass window; A convection oven characterized by having a shutter that covers the glass window. 2. The convection oven according to claim 1, wherein the shutter is provided with an automatic roll-in type shutter storage unit provided at an upper portion of the door and a hook of the shutter provided at a lower portion of the door.