JP3676622B2 - Steam cooking equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam cooking apparatus such as a steam convection oven that cooks food by sending steam or hot air into a food heating chamber. In particular, the present invention relates to a steam cooking apparatus having a steam generator that can be manufactured at a relatively low cost with a small number of parts.
[0002]
[Prior art]
7 and 8 are views showing a steam generator of a steam convection oven disclosed in Japanese Patent Application Laid-Open No. 11-82904. FIG. 7 is a longitudinal sectional view and FIG. 8 is a transverse sectional view.
The steam generator 60 includes a tank 61 in which water is stored. In the tank 61, a combustion chamber 60a having a vertical hole shape and a heat exchanging portion 60b communicating with the distribution passage 69 at the lower end of the combustion chamber 60a are formed.
[0003]
An overheat prevention pipe 71 is provided in the combustion chamber 60a so as to hang down. The lower end surface of the pipe 71 does not reach the bottom surface of the tank, and there is a gap between them. Exhaust gas burned by a burner (not shown) installed on the upper portion of the overheat prevention pipe 71 flows downward through the overheat prevention pipe 71 and is sent to the heat exchange chamber 60b through the distribution passage 69. The heat exchange chamber 60b includes a plurality of slit-shaped passages 61a, 61b, 61c extending vertically. Exhaust gas flows upward through these passages 61a, 61b and 61c toward an exhaust port (not shown). At this time, heat exchange with water in the tank is performed between the exhaust and the wall of the passage. Steam generated by heat exchange is discharged from an outlet 65 at the top of the tank 61.
[0004]
Between the pair of walls 62 protruding from both side walls of the tank at the boundary between the combustion chamber 60a and the heat exchange chamber 60b, a slit-like port 64 extending vertically is opened. An insert 63 is fitted in the mouth 64. The insert 63 has an H-shaped cross section, and two parallel flange portions 63 a are fitted so as to sandwich both walls 62, and are inserted along the walls 62 from the top to the bottom. The insert 63 is fixed so as not to fall down at a certain position, and a mouth is also opened between the lower end of the insert 63 and the bottom of the tank. The insert 63 prevents the exhaust gas from flowing from the combustion chamber 60a to the exhaust port by bypassing the heat exchange chamber 60b.
[0005]
[Problems to be solved by the invention]
The steam generator described above has a simple structure and is relatively easy to manufacture, but the number of parts increases by the amount of the insert, resulting in high costs. However, when the insert is not provided, the performance deteriorates because a part of the exhaust flows bypassing the heat exchange section.
[0006]
The present invention has been made in view of such problems, and an object of the present invention is to provide a steam generator that has a simple structure, is relatively inexpensive to manufacture, and is more efficient in a steam cooking apparatus. .
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a first steam cooking apparatus of the present invention is a steam cooking apparatus including a heating chamber for heating food and a steam generator for generating steam to be supplied to the heating chamber. The steam generator includes a casing formed of a hollow wall in which water is accumulated, and a burner that ejects combustion exhaust toward a lower portion of the casing, and the casing receives the combustion exhaust from the burner. A combustion chamber, and a heat exchange chamber that is reversed and flows upward after the received combustion exhaust gas flows from the combustion chamber, and a heat exchange section in which a casing hollow wall protrudes is formed in the heat exchange chamber. cage, the boundary portion between the combustion chamber and the heat exchange chamber, with is separated by a pair of heat exchanging portion projecting to face the casing except for the bottom through which a combustion exhaust (partition wall) of the pair gap between the partition wall The gap between the pair of partition walls is 2 mm or less during operation .
Since the heat exchange chamber and the combustion chamber are separated by the partition wall, it is not necessary to use an additional part such as an insert, and the combustion gas bypass can be reduced. The number of parts is reduced by the amount of the insert, and the manufacturing cost is reduced.
Further, the manufacturing process is simplified and the manufacturing cost is reduced as compared with the case of manufacturing the partition without providing a gap.
[0008]
If the gap between the upper Symbol pair of partition walls 2mm or less during operation, combustion gas without substantially bypasses the heat exchange chamber is efficiently guided to the heat exchange chamber.
[0009]
Another steam cooking equipment of the present invention is characterized in that to overlap the leading end of the pair of partition walls. By bending the gap between the partition walls, the combustion gas flowing through the gap can be reduced, and the combustion gas can be efficiently supplied to the heat exchange chamber. Further, since it is only necessary to offset the position of the partition wall, there is no need to process the tip of the partition wall, and the manufacturing can be simplified.
[0010]
Or the front-end | tip part of a pair of partition may be made into a key shape, and the clearance gap between both partitions may be made into a crank shape. Or it is good also as making the front-end | tip part of a pair of partition enter into uneven | corrugated shape.
[0011]
In steam cooking apparatus of the present invention, also the combustion chamber, it is preferable that the heat exchange unit casing hollow wall is projected is formed.
Since heat exchange can be performed even in the combustion chamber, the heat exchange efficiency is improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates, referring drawings.
First, the overall structure of a steam cooking apparatus (steam convection oven) according to an embodiment of the present invention will be described with reference to FIG.
The steam convection oven 1 is configured around a rectangular parallelepiped heating chamber 3. The heating chamber 3 is provided with a heating device 7 and a cooking unit 9 across a wire mesh filter 5.
[0013]
The heating device 7 includes a heater 8, a fan 11, a steam generator 20, and the like. The heater 8 includes a burner 91 and a number of heating pipes 93 through which the combustion gas burned in the burner 91 passes. The heating tube 93 is arranged so as to surround the fan 11. When the fan 11 is rotated by the motor 13, the air blown from the fan 11 is heated in contact with the heating pipe 93 and supplied to the cooking unit 9.
[0014]
The steam generator 20 includes a tank 21 and a burner 23 in which water is stored (details will be described later). The combustion gas generated by burning in the burner 23 is heat-exchanged in the heat exchange chamber 20b of the tank 21 to heat the water in the tank and generate steam. The generated steam is supplied to the cooking unit 9 from an outlet 25 opened to the side of the fan 11. The combustion gas is discharged out of the warehouse through the exhaust pipe 95 of the heater 8.
As described above, the high-temperature air generated by the heating device 7 and the steam generated by the steam generator 20 are blown out to the cooking unit 9 to heat-cook the food 17 on the tray 15.
[0015]
1A and 1B are diagrams showing a steam generator of the steam cooking apparatus of FIG. 2, in which FIG. 1A is a transverse sectional view and FIG. 1B is a longitudinal sectional view.
The steam generator 20 includes a square box-shaped casing 21. In the casing 21, a vertical hole-shaped combustion chamber 20a and a heat exchange chamber 20b are provided. The combustion chamber 20a and the heat exchange chamber 20b communicate with each other through a distribution path 29 at the lower end of the combustion chamber 20a via a partition wall 27. The combustion gas blown downward into the combustion chamber 20a passes through the distribution path 29 and is discharged upward through the heat exchange chamber 20b.
[0016]
The casing 21 has a hollow structure surrounded by walls, and a predetermined amount of water is stored therein. An outlet 25 is formed in the upper part of the casing, and steam generated by heating the stored water is blown out toward the fan 11 (FIG. 2). An overheat prevention pipe 31 is provided in the combustion chamber 20a so as to hang down. The lower end surface of the pipe 31 does not reach the bottom surface of the casing, and there is a gap between them. Further, the lower end surface is located below the water surface 33 in the casing. A burner 23 is disposed on the upper portion of the overheat prevention pipe 31 so as to face downward.
[0017]
The burner 23 includes a fan 35 and is further connected to a combustion gas source via a valve 37. The burner 23 mixes the supplied combustion gas with air and burns it to generate combustion gas. The combustion gas is sent downward through the overheat prevention pipe 31. At this time, since the lower end surface of the overheat prevention pipe 31 extends to the distribution path 29, the combustion exhaust comes into contact with the wall of the casing 21 above the water surface 33 and prevents the wall from overheating.
[0018]
The heat exchange chamber 20b is formed by projecting a pair of opposing side walls of the casing inward, and includes a plurality of projecting portions 39a, 39b, 39c, and 39d. A predetermined interval is provided between the opposing tips of the pair of protrusions, and the tip is a distribution path. Only the opposing projecting portion 39d located closest to the combustion chamber is formed such that the lower portion floats from the bottom surface of the casing. A space between the lower end surface of the protrusion 39d and the bottom surface of the casing 21 acts as a distribution path 29. The protrusion 39d acts as a partition wall 27 between the combustion chamber 20a and the heat exchange chamber 20b.
The opposite tip of the protrusion 39d closest to the combustion chamber is disposed closer to the opposite tip of the other protrusions. Details of this point will be described later.
[0019]
The combustion gas supplied from the combustion chamber 20 a can flow into the distribution path 29 on the bottom surface of the casing and the gap 27 a between the partition walls 27. Here, the distribution path 29 has a wide cross-sectional area formed by the lower end surface of the partition wall 27 and the bottom surface of the casing. On the other hand, the gaps 27a between the partition walls 27 are arranged close to each other as described above, and the cross-sectional area is narrow. For this reason, most of the combustion gas flows into the distribution path 29 and is sent to the heat exchange chamber 20b. Therefore, the combustion gas is supplied almost evenly throughout the heat exchange chamber 20b without almost bypassing the heat exchange chamber 20b. If the gap 27a between the pair of partition walls 27 is 2 mm or less during operation , the combustion gas is efficiently guided to the heat exchange chamber 20b without almost bypassing the heat exchange chamber 20b.
[0020]
The combustion gas supplied to the heat exchange chamber 20b contacts the protrusions 39a, 39b, 39c, 39d and heats the water in the casing by heat exchange. Furthermore, heat exchange is also performed between the partition walls 27 at this time. Steam generated by heating is blown out from the outlet 25 to the fan 11.
[0021]
3, 4 and 5 are plan sectional views showing various shape examples of the tip of the partition wall.
In general, the partition walls and the heat exchanging portion are processed by welding or brazing by bending a plate of stainless steel or the like.
[0022]
The partition wall 27 shown in FIG. 3 is disposed so that the tips of the opposing protrusions overlap. The overlap margin L of the overlapping portion is preferably 2 mm or less. This shape is formed by offsetting the position of the partition wall 27 and is easy to manufacture.
[0023]
The partition wall 27 shown in FIG. 4 has a key-like tip, and the gap between the partition walls 27 is a crank shape.
In the partition wall 27 shown in FIG. 5, one tip is convex and the other tip is concave corresponding to the convex shape.
In these examples, the tip end of the partition wall can be further processed to form a complicated shape between the tip ends. For this reason, the effect of bypassing combustion gas is improved. Further, the contact area with the combustion gas is increased, and the heat exchange rate is also improved.
[0024]
FIG. 6 is a plan view showing a structure of a steam generator according to another embodiment of the present invention.
The steam generator 20 ′ includes a combustion chamber 20a ′ and a heat exchange chamber 20b ′ separated by a distribution passage through the combustion chamber and a partition wall 27 ′. The partition wall 27 ′ has the same shape as the partition wall shown in FIG.
[0025]
The combustion chamber 20a ′ is provided with a plurality of protruding portions 41a, 41b, 41c, and 41d protruding inward from the surrounding walls. The protrusion is fixed by welding or brazing by bending a plate of stainless steel or the like as described above. These protrusions act as heat exchange parts in the combustion chamber. That is, the water in the tank is heated in the protrusion 41 by exchanging heat with the combustion gas remaining in the combustion chamber. Steam generated by heating is blown out from the outlet.
[0026]
Since the steam generator in this example performs heat exchange even in the combustion chamber, the heat exchange efficiency is improved.
[0027]
【The invention's effect】
As is apparent from the above description, according to the present invention, in the steam generator of the steam cooking apparatus, the heat exchange chamber and the combustion chamber are separated by the adjacent partition walls, so there is no need to use additional parts such as inserts. , Combustion gas bypass can be prevented. For this reason, the number of parts is reduced and the manufacturing cost is reduced. Moreover, in the aspect which provided the heat exchange part in the combustion chamber, heat exchange efficiency can be improved.
[Brief description of the drawings]
1 is a view showing a steam generator of the steam cooking apparatus of FIG. 2, FIG. 1 (A) is a transverse sectional view, and FIG. 1 (B) is a longitudinal sectional view.
FIG. 2 is a diagram showing an overall structure of a steam cooking apparatus (steam convection oven) according to an embodiment of the present invention.
FIG. 3 is a plan sectional view showing an example of the shape of the tip of the partition wall.
FIG. 4 is a plan sectional view showing an example of the shape of the tip of the partition wall.
FIG. 5 is a plan sectional view showing an example of the shape of the tip of the partition wall.
FIG. 6 is a plan view showing a structure of a steam generator according to another embodiment of the present invention.
FIG. 7 is a longitudinal sectional view showing a steam generator of a steam convection oven disclosed in Japanese Patent Application Laid-Open No. 11-82904.
FIG. 8 is a cross-sectional view showing a steam generator of a steam convection oven disclosed in Japanese Patent Application Laid-Open No. 11-82904.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steam cooking apparatus 3 Heating warehouse 5 Wire mesh filter 7 Heating apparatus 8 Heater 9 Cooking part 11 Fan 13 Motor 15 Tray 17 Food 20 Steam generator 21 Casing 23 Burner 25 Outlet 27 Bulkhead 29 Distribution path 31 Overheating prevention pipe 33 Water surface 35 Fan 37 Valve 39 Projection 41 Projection

Claims (5)

A heating chamber for heating food,
A steam generator for generating steam to be supplied to the heating chamber;
A steam cooking device comprising:
The steam generator is
A casing consisting of a hollow wall in which water accumulates,
A burner that ejects combustion exhaust toward the lower part of the casing,
The casing is
A combustion chamber for receiving combustion exhaust from the burner;
A heat exchange chamber that reverses and flows upward after the received combustion exhaust gas flows from the combustion chamber,
In the heat exchange chamber, a heat exchanging portion in which a casing hollow wall protrudes is formed,
Interface between the heat exchange chamber and the combustion chamber, with is separated by a pair of heat exchanging portion projecting to face the casing except for the bottom through which a combustion exhaust (partition wall) between the pair of partition wall gap is provided to,
A steam cooking apparatus, wherein a gap between the pair of partition walls is 2 mm or less during operation . A heating chamber for heating food,
A steam generator for generating steam to be supplied to the heating chamber;
A steam cooking device comprising:
The steam generator is
A casing consisting of a hollow wall in which water accumulates,
A burner that ejects combustion exhaust toward the lower part of the casing,
The casing is
A combustion chamber for receiving combustion exhaust from the burner;
A heat exchange chamber that reverses and flows upward after the received combustion exhaust gas flows from the combustion chamber,
In the heat exchange chamber, a heat exchanging portion in which a casing hollow wall protrudes is formed,
The boundary between the heat exchange chamber and the combustion chamber is separated by a pair of heat exchange portions (partitions) that project in the casing, excluding the lower part through which the combustion exhaust passes, and between the pair of partition walls. There is a gap in the
Steam cooking apparatus you characterized in that the tip of the pair of partition walls are overlapped. A heating chamber for heating food,
A steam generator for generating steam to be supplied to the heating chamber;
A steam cooking device comprising:
The steam generator is
A casing consisting of a hollow wall in which water accumulates,
A burner that ejects combustion exhaust toward the lower part of the casing,
The casing is
A combustion chamber for receiving combustion exhaust from the burner;
A heat exchange chamber that reverses and flows upward after the received combustion exhaust gas flows from the combustion chamber,
In the heat exchange chamber, a heat exchanging portion in which a casing hollow wall protrudes is formed,
The boundary between the heat exchange chamber and the combustion chamber is separated by a pair of heat exchange portions (partitions) that project in the casing, excluding the lower part through which the combustion exhaust passes, and between the pair of partition walls. There is a gap in the
The pair of the tip of the partition wall has a hook-shaped, steam cooking apparatus gaps between both partition walls you characterized in that has a crank shape. A heating chamber for heating food,
A steam generator for generating steam to be supplied to the heating chamber;
A steam cooking device comprising:
The steam generator is
A casing consisting of a hollow wall in which water accumulates,
A burner that ejects combustion exhaust toward the lower part of the casing,
The casing is
A combustion chamber for receiving combustion exhaust from the burner;
A heat exchange chamber that reverses and flows upward after the received combustion exhaust gas flows from the combustion chamber,
In the heat exchange chamber, a heat exchanging portion in which a casing hollow wall protrudes is formed,
The boundary between the heat exchange chamber and the combustion chamber is separated by a pair of heat exchange portions (partitions) that project in the casing, excluding the lower part through which the combustion exhaust passes, and between the pair of partition walls. There is a gap in the
Steam cooking apparatus you characterized in that the tip of the pair of partition walls intricate uneven. In the combustion chamber, the steam cooking apparatus that according to any one of the preceding claims, characterized in that the heat exchange unit casing hollow wall is projected is formed.

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