JPH0228046B2 - - Google Patents

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) Ovens such as electric ovens for baking French bread and the like must be equipped with a steam generator for blowing steam onto bread 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 Laid-open No. 50-64688 has proposed a steam oven that supplies high-temperature heating steam directly to foods for thawing, reheating, and simple cooking of frozen foods. This steam range has a structure in which a steam generator is provided in the upper part of the food compartment. This steam generator 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, the technical idea cannot be directly applied to 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, water droplets only become beads and do not turn into steam. Further, there is a problem that the hot water balls fall into the firing chamber and fall 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 the water sprinkled in the steam generation chamber can be vaporized to prevent hot water balls from falling into the firing chamber, and to further heat the steam. (c) Reducing equipment costs and running costs by eliminating the need for equipment such as boilers, etc.

(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 is provided with a water sprinkling means and a steam spout, and the steam spout and the water sprinkling means are connected to each other. In between is an oven with a steam generator equipped with a steam filter made of a material with good thermal conductivity that vaporizes the hot water ball and further heats the passing steam as it passes through.

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 electricity and gas can be used.

The steam outlet provided in the steam generation chamber can be provided via a pipe protruding into the steam generation chamber, but it can also be provided directly in the steam generation chamber.

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.

Steam filters are made of materials with good thermal conductivity. Examples include a cylinder made of multiple layers of wire mesh or a bundle of steam wool. The steam generation chamber is heated by the heat source, and due to the heat conduction, the steam filter becomes extremely hot, crushing the hot water beads it comes into contact with and instantly vaporizing them.

The water sent to the steam generation chamber becomes a hot water ball on the floor of the steam generation chamber, and is vaporized by a steam filter.The steam is further heated as it passes through the steam filter, and the steam is heated from the steam outlet to the fired material. sprayed onto objects,
The object to be fired is fired to a desired quality.

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

FIG. 1 is a cutaway perspective view of essential parts of an embodiment in which a steam generation chamber is disposed in the upper part of an electric oven.

Reference numeral 100 denotes an electric oven, and a required number of firing heaters 1, 1a, 1b, 1c, and 1d are arranged at the upper part as a heat source. Although not shown, a required number of firing heaters are also provided at the bottom as a heat source.

A steam generation chamber 2 is provided between the firing heaters 1, 1a, 1b, 1c, and 1d and an inner ceiling 101 within the electric oven 100. Inside the steam generation chamber 2, on the opening 102 side of the electric oven 100, two steam generation tubes 3, 3a are provided in contact with the top plate 20 with a slight gap between them. , 3a is provided with a slight gap. Both ends of the steam generation tubes 3, 3a are airtightly and watertightly joined to the side wall 21 of the steam generation chamber 2 to prevent steam and water from leaking to the outside. Electric heaters 31, 31a are built into the steam generating tubes 3, 3a to heat the steam generating tubes 3, 3a.

In this embodiment, a steam generation pipe 3 is installed in the steam generation chamber 2.
3a and electric heaters 31, 31a are provided,
If the firing heaters 1, 1a, 1b, 1c, and 1d generate a sufficient amount of heat, the steam generation tubes 3, 3a and the electric heaters 31, 31a may not necessarily be provided.

Further, it is also possible to provide only the steam generating pipes 3, 3a and omit the electric heaters 31, 31a.

A water sprinkler pipe 4 is provided between the steam generating pipes 3 and 3a. A required number of water sprinkling holes 41 are bored on both sides of the water sprinkling pipe 4, and by injecting water into the water sprinkling pipe 4, water is injected into the steam generating pipes 3, 3a. A slight gap is provided between the water sprinkler pipe 4 and the bottom plate 22. The surfaces of the steam generating tubes 3, 3a may be smooth, but since they are heated by the electric heaters 31, 31a, the surfaces are at a high temperature, so that the water boils and becomes a hot water droplet. Therefore, fine irregularities are formed on the outer surfaces of the steam generating tubes 3, 3a to ensure sufficient vaporization of water, but it is preferable to wrap them with a wire mesh.

5 is a reinforcing rib using an L-shaped angle, and the upper part is attached to the top plate 20 and the lower part is attached to the bottom plate 22. A required number of ventilation holes 51 are formed in the lower part of the reinforcing rib 5, so that the generated steam flows to a steam outlet 7, which will be described later.

Reference numeral 6 denotes a steam filter formed into a cylindrical shape by winding a wire mesh a plurality of times, and is provided over the entire width of the steam generation chamber 2. The steam generation chamber 2 is heated by the heat source, and the steam filter 6 generates high heat due to heat conduction, which further heats the steam passing through the vent 51 and prevents the hot water from passing through. Therefore, it is possible to sufficiently prevent hot water balls from flying out from the steam outlet 71.

7 is a steam ejection pipe, which uses a bottomed pipe to prevent water droplets from falling into the oven 100, and is connected to the bottom plate 22.
It is installed vertically. A required number of steam jet holes 71 are bored in the circumferential surface of the lower part of the steam jet pipe 7. The steam ejection pipe 7 is elongated at the upper part of the oven 100 or below the firing heaters 1, 1a, 1b, 1c, and 1d to prevent steam from being applied thereto to prevent electrical leakage.

Moreover, the upper end of the steam jet pipe 7 is provided so as to be higher than the bottom plate 22 so that the water will not flow out into the oven 100 if the water is not sufficiently vaporized for some reason.

In this embodiment, only the steam generation chamber 2 is created separately and placed above the oven 100, but the top plate 20 of the steam generation chamber 2 is attached to the inner ceiling 100 of the oven 100.
It is also possible to combine the steam generation chamber 2 with the oven 100.

The electric heaters 31, 31a are connected to the steam generation pipes 3, 3.
The electric heaters 31, 3
When electricity is applied to 1a, the amount of heat inside oven 100 increases. In this case, firing heaters 1, 1a, 1
The amount of heat in the oven 100 can be kept constant by lowering the amounts of heat in the ovens b, 1c, and 1d. This operation is performed by interlocking the electric heaters 31, 31a and the firing heaters 1, 1a, 1b, 1c, 1d, but it is also possible to allow each to operate independently. 23 is a drain for overflow prevention, and 105 is a heat insulating material.

This embodiment works as follows.

Steam generation chamber 2 for baking objects to be baked such as bread
The firing heaters 1, 1a, 1b, 1c, and 1d below generate heat to fire the object to be fired and heat the steam generation chamber 2 to a high temperature. When the object to be fired requires steam, a changeover switch (not shown) is operated to turn on the electric heaters 31 and 31a to heat the steam generation tubes 3 and 3a. After that, open the valve (not shown) to inject water into the water sprinkling pipe 4, and
1 to the steam generating pipes 3 and 3a. The water sent to the steam generation chamber 2 becomes steam and is jetted into the oven 100 from the steam jet hole 71. The water becomes a bead on the floor of the steam generation chamber, but is vaporized by the steam filter 6, which is heated to a high temperature by heat conduction. Further, the steam passes through a steam filter 6 and is further heated, so that the object to be fired is fired to a desired quality.

(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 is provided with a water sprinkling means and a steam spout. A steam filter made of a material with good thermal conductivity is installed between the two, and the steam filter vaporizes the hot water, further heats the steam obtained in the steam generation chamber, and sends it to the firing chamber. As a result, the following effect occurs.

(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 baking heater is temporarily turned off, the temperature inside the oven can be maintained at a constant temperature for a long time due to the heat released from the steam generation chamber.

(d) Water sprinkled inside the steam generation chamber can be reliably vaporized. Moreover, since the steam passes through the steam filter and is further heated as steam and sent into the firing chamber, no hot water balls or the like enter the firing chamber and do not have any adverse effect on the objects to be fired.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of essential parts of an embodiment in which a steam generation chamber is disposed in the upper part of an electric oven. 100: Electric oven, 1, 1a, 1b, 1
c, 1d: firing heater, 2: steam generation chamber, 4: water sprinkler pipe, 3, 3a: steam generation pipe, 7: steam ejection pipe,
71: Steam injection hole.

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 a water sprinkling means and a steam spout, and between the steam spout and the water sprinkling means, a hot water ball is placed between the steam generating chamber and the water sprinkling means. An oven equipped with a steam generator, characterized in that a steam filter made of a material with good thermal conductivity is provided, which further heats passing steam as it passes through.