JPH0131090B2 - - Google Patents

Abstract

PURPOSE:To obtain beautiful finish in baked French rolls of reads, by constituting an oven in such a manner that an upper flame burner is disposed under a steam generating chamber which is provided in the uppermost part of an oven, a baking plate under the upper flame burner, and a lower flame burner under the baking plate, respectively, in the titled gas oven for baking French rolls of bread. CONSTITUTION:Doughs B of French rolls, placed on a baking plate 9 in an oven, are steamed so as to be wrapped up in steam, by the steam generated from a steam chamber 7, by being heated by an upper flame burner 8. The heat from the upper flame burner 8 bakes the upper surfaces of doughs B. While the heat of a lower flame burner 10 flows onto the baking plate 9, passing through small holes 12, blast channels 14, and small holes 13, to bake the doughs B, as well as to indirectly bake the undersides of doughs B interposed by the baking plate 9. With such an arrangement, French rolls can be baked up in desired hardness, with luster being given to the surfaces of them.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an oven with a steam generator.

(Prior Art and its Problems) Usually, an oven for baking French bread, such as a gas oven, must be equipped with a steam generator for blowing steam onto the dough. A boiler was used as the steam generator, and was installed separately from the oven. but,
In this case, a large boiler is required, which increases equipment costs and requires additional installation space.

Additionally, because boilers must be kept burning at all times so that steam can be ejected as soon as needed, they consume large amounts of fuel and increase running costs.

Furthermore, the temperature of the steam drops in the piping from the boiler to the oven, making it impossible to obtain high-temperature steam, resulting in poor gloss on the surface of the French bread, and failure to bake it to the desired hardness.

By the way, Japanese Utility Model Application Publication No. 50-64688 proposes a steam range that supplies high-temperature heating steam directly to foods for defrosting and reheating frozen foods and for simple cooking. This steam range has a structure in which a steam generator is provided in the upper part of the food compartment. This steam generation device has a heater installed inside a metal plate, a steam generation chamber and a steam generation path formed inside, and a large number of through holes drilled downward.

However, this technical idea cannot be used as is in the oven. In other words, in the case of an oven, the temperature inside the oven is high because it bakes things. In particular, when baking bread and installing a steam generation chamber above the heat source, the floor of the steam generation chamber is at a high temperature, and when water is sprinkled, the water scatters in the form of hot water beads before becoming steam. Another problem is that the hot water balls fall into the firing chamber and onto the objects to be fired.

(Objective of the Invention) Therefore, the object of the present invention is as follows: (a) A steam generation chamber is provided in the oven so that heated steam can be sprayed onto the object to be baked in the oven when necessary, so that the object to be baked can be heated to the desired temperature. (b) To ensure that hot water balls do not fall into the firing chamber before the water sprinkled in the steam generation chamber is vaporized; (c) To ensure that equipment such as boilers is not damaged. Reducing equipment costs and running costs are necessary.

(Structure of the Invention) According to the present invention, a steam generation chamber is provided above the upper heat source in the oven, and the steam generation chamber includes a water sprinkling means and a cylindrical steam outlet protruding toward the interior of the oven. The oven is equipped with a steam generator, and a plurality of baffle plates are provided between the steam spout and the water sprinkling means to prevent hot water balls from coming out of the steam spout.

The steam generation chamber can be created separately from the oven body and installed within the oven, but it can also be formed integrally with the oven body.

As the heat source, known heat sources such as gas and electricity can be used.

The water sprinkled into the steam generation chamber can be in the form of a fountain or can be sent in the form of a mist.

The water then sent to the steam generation chamber becomes a hot water ball on the floor of the steam generation chamber, but is blocked by the baffle plate, so it does not jump out of the spout and is vaporized, and is then jetted from the steam spout onto the object to be fired. Thus, the object to be fired can be fired to desired quality.

(Example) The present invention will be described in more detail based on an example of a gas oven shown in the drawings.

FIG. 1 is a sectional view of a first embodiment of a gas oven with a steam generator, and FIG. 2 is a partially cutaway perspective view showing details of the steam generation chamber shown in FIG. 1.

1 is an oven main body, 2 is an opening/closing door, and an exhaust port (not shown) for combusted exhaust gas is provided on the top surface. A steam generation chamber 7 is provided at the top of the firing chamber 6. A top burner 8 is provided directly below and adjacent to the steam generation chamber 7. A hot plate 9 is mounted below the top burner 8 and at a required distance.
A lower burner 10 is installed directly below the hot plate 9, and the bread dough B is placed on the hot plate 9 and baked.

Note that the upper burner 8 and the lower burner 10 are of a forced combustion type.

In the inner wall where the inner wall of the firing chamber 6 and the hot plate 9 come into contact, small holes 12 and 13 are formed at the top and bottom of the hot plate 9 as a boundary.
Many holes have been drilled. The outside of the inner wall 11 is partitioned to form an insertion groove (not shown) so that these small holes 12 and 13 communicate with each other.

A large number of small exhaust holes 16 are bored in the back wall 15 of the firing chamber 6 at locations slightly above the hot plate 9. This exhaust hole 16 communicates with an exhaust groove 17 provided on the back side of the back wall 15, and further communicates with the exhaust port of the oven, so that the combustion exhaust gas in the gas oven is discharged from the exhaust hole 16.

The steam generation chamber 7 has a baking chamber 6 ceiling wall connected to a top plate 18.
The inside of the oven is partitioned into a box shape by the top plate 18 and the lower bottom plate 19. A sprinkler pipe 20 is disposed approximately in the center of the steam generation chamber 7. On the left and right sides of the water sprinkler pipe 20, partition plates 21 having a large number of through holes 21a bored in the lower part are arranged. Furthermore, baffle plates 22 are placed on the outside of this partition plate 21, respectively, for the top plate 18 and the bottom plate 1.
9, and a drain outlet 23 is provided between the baffle plates 22.

Cylindrical steam outlets 24 are provided upright from the bottom plate 19 at the frontmost and rearmost parts of the bottom plate 19 when viewed from the door 2 side, to prevent hot water balls from flowing down into the firing chamber 6. Further, a top burner 8 is installed directly below the water sprinkler pipe 20. This water sprinkling pipe 20 has small holes 25 bored on both left and right sides of the lower part along the tube axis, and the midway piping of the water sprinkling pipe 20 is routed around the back side of the baking chamber wall so that it can absorb the heat in the oven. Allows for preheating. Moreover, when there are a plurality of top burners 8, a plurality of steam generation chambers can also be provided correspondingly.

FIG. 3 is a sectional view of a second embodiment of the gas oven with a steam generator, and FIG. 4 is a partially cutaway perspective view showing details of the steam generation chamber shown in FIG. 3.

In this embodiment, the steam generation chamber 7 is replaced by the oven main body 1.
It is created separately from the steam generation chamber 7, which is located on the back wall 15.
A gap 151 is formed between the two. The steam generation chamber 7 is thus attached to the ceiling wall of the firing chamber 6. A required number of exhaust holes 152 are bored in the upper part of the back wall 15 near the ceiling.

Further, the exhaust groove 17 extends upward so as to communicate with the exhaust hole 152, and further communicates with the exhaust port 3 formed on the back side of the oven body 1.

Note that the oven having the structure shown in this example has a first
It is better to ignite during cold winter mornings than the oven with the structure shown in the figure. The reason for this is unclear, but after ignition and combustion, water vapor is generated in the firing chamber 6.
As the accumulated water vapor does not escape and condenses inside the oven, which is cooling due to the drop in temperature, the safety device in the event of electrical leakage installed in the ignition device of the upper burner 8 is activated, causing the upper burner 8 to This is thought to be due to the gas supply being cut off. Therefore, it is thought that combustion in the upper burner 8 can be improved by improving the exhaust air from the ceiling of the firing chamber 6 to prevent water vapor from accumulating. Note that the exhaust hole 152 described above
In order to keep the thermal energy within the firing chamber 6 as much as possible, it is preferable that the number is small within the range that improves combustion.

One sprinkler pipe 20 is disposed between a partition plate 21 and a baffle plate 220 formed on both left and right sides of the steam generation chamber 7. A required number of small holes 25 for spouting water toward the center of the steam generation chamber 7 are bored in each of the water sprinkling pipes 20 along the pipe axis, and the water spouting direction is opposite to the steam spout 24. direction. In other words, even if water sprayed onto the heated bottom plate 19 becomes a hot water bead and scatters, the steam outlet 24
This makes it difficult for them to jump out. Moreover, the contact area with the bottom plate is widened so that the steam flows out from the through hole 21a to the center of the bottom plate 19, so that a large amount of superheated steam can be generated instantaneously.

The baffle plate 220 has a rectangular gutter-like cross-sectional shape, and has a lower side wall 221 at the center of the steam generation chamber 7, and the opposite side thereof serves as a partition wall 223 of the steam generation chamber 7. A required number of slits 222 are bored at the lower corner of the partition wall 223 at predetermined intervals to form water vapor flow paths. In the gutter groove of the baffle plate 220, wrap fine wire mesh several times, etc.
A hot water ball passage preventing member 229 is provided which allows steam to pass through but not hot water balls, thereby further sufficiently preventing hot water balls from flowing down from the steam spout 24. A reinforcing rib 191 is provided on the upper surface of the bottom plate 19 above the top burner 8 to prevent the bottom plate 19 from being deformed by the heat of the top burner 8. Note that parts that are the same as or equivalent to those in the first embodiment are denoted by the same reference numerals.

Function: After igniting the upper burner 8 and the lower burner 10, French bread dough B is placed on the hot plate 9 and placed in the oven. While firing at a temperature of about 220° C., water is sent to the sprinkler pipe 20, and the required amount of water is sprayed onto the bottom plate 19 through the small holes 25. Since the bottom plate 19 is heated to 220° C. or higher by the upper burner 8, the injected water instantaneously turns into hot water beads and scatters, and as it moves around, it turns into heated steam.

The heated steam is injected into the baking chamber 6 from the steam injection port 24 through the through hole 21a of the partition plate 21, passes between the baffle plates 22 and 220, and acts to wrap the bread dough B placed on the hot plate 9. Then bake it into a hard French bread with a glossy surface.

The combustion heat of the upper burner 8 heats the upper surface of the bread dough B, the combustion heat of the lower burner 10 heats the hot plate 9 and indirectly heats the lower surface of the bread dough B, and residual combustion heat is transferred to the small hole 12. After exiting and passing through the conveyance groove,
It flows out from the small hole 13 in the upper part to the upper part of the hot plate 9 and heats the bread dough B. Thereafter, the combustion exhaust gas, which has become high in temperature due to combustion, remains in the upper part of the baking chamber 6 and becomes atmospheric heat, which descends to the hot plate 9 by natural convection and bakes the bread dough B on the hot plate 9.

After the high-temperature combustion exhaust gas is applied to the bread dough B, which is the object to be baked, placed on the hot plate 9 and baked, the cooled combustion exhaust gas that is no longer useful for baking is discharged through the exhaust hole 16.
It is discharged from the oven through the outlet.

It should be noted that the present invention is not limited to the illustrated embodiment, and many modifications can be made within the scope of the claims.

(Effects of the Invention) According to the present invention, a steam generation chamber is provided above the upper heat source in the oven, and the steam generation chamber includes a water sprinkling means and a cylindrical steam jet protruding toward the interior of the oven. An outlet is provided, and a plurality of baffle plates are provided between the steam outlet and the water sprinkling means to prevent hot water beads from coming out of the steam outlet, resulting in the following effects.

(a) Heated steam can be injected onto the object to be baked in the oven whenever necessary, and the object to be baked can be baked to the desired quality.

(b) Since no separate equipment such as a boiler is required, equipment costs can be reduced, and running costs are also reduced because there is no need to pay for fuel for boilers, etc.

(c) When burning materials that do not require steam, the heated steam generation chamber becomes a large heat source;
Even if the gas burner is temporarily turned off, the heat released from the steam generation chamber can keep the oven at a constant temperature for a long time.

(d) Since a plurality of baffle plates are provided between the steam spout and the water sprinkling means to prevent hot water balls from coming out of the steam spout, the water sprinkled into the steam generation chamber can be reliably vaporized. Moreover, the hot water balls do not fall into the firing chamber and do not adversely affect the objects to be fired.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a first embodiment of the gas oven with a steam generator, Fig. 2 is a partially cutaway perspective view showing details of the steam generation chamber shown in Fig. 1, and Fig. 3 is a cross-sectional view of a gas oven with a steam generator. sectional view of a second embodiment of the gas oven;
FIG. 4 is a partially cutaway perspective view showing details of the steam generation chamber shown in FIG. 3. 7: Steam generation chamber, 8: Upper fire burner, 20: Water sprinkler pipe, 24: Steam spout, 22, 220: Baffle plate.

Claims (1)

[Claims] 1. A steam generation chamber is provided above the upper heat source in the oven, and the steam generation chamber is provided with water spraying means and a cylindrical steam outlet protruding toward the interior of the oven.
An oven with a steam generator, characterized in that a plurality of baffle plates are provided between the steam spout and the water sprinkling means to prevent hot water balls from coming out of the steam spout.