DE19740238A1 - Steam baking oven - Google Patents

Abstract

A steam baking oven has, in its firing space, a movable storage block with a number of vertical holes corresponding to the number of heater tubes used for heat transfer to the baking space.

Description

The invention relates to a further development of the known steam oven.

Known steam ovens have closed heating pipes where the steam is the heat from the furnace leads to the baking rooms. These are, for example known from DRP 136 781, DRP 56 367 and DE 27 31 803 A1. Another oven is out U.S. Patent 1,394,706. In these ovens, the ends the heating pipes in the combustion chamber under direct Flame heated. This usually leads to Cracks and partially at the heating points for Bursting of the same.

To counteract the destruction of the heating pipes, has been suggested with special ends To provide protective covers or the end of one alloy steel with higher yield strengths manufacture (DRP 528 665).

The disadvantage of these pipes is that Double wall a poor heat exchange takes place or this is more expensive to manufacture become.

For this reason, one already has steam ovens the ends of the closed pipes in a container introduced, which contains molten metal to to heat them indirectly through the liquid metal. If the solidified metal block is warmed up, this is how it works however, compressive forces on the tube walls and it need at the moment of the liquefaction of the metal Voltage jumps occur.  

It is also necessary to strongly tighten the container heat to melt the metal block bring, which can easily lead to overheating. As a result of the large amount of cooled down Metal, it is difficult to heat the furnace throttle quickly.

The invention has for its object a To specify steam oven of the type mentioned at the outset, heating by a new arrangement of the heating pipes improved, the destruction of the pipes avoided and thus a more economical use the amount of heat supplied by the heater is made possible.

According to the invention, this object is achieved by that over a combustion chamber, in addition to conventional Alternatively, gas or oil burners can be heated can, there is a so-called memory block. This consists of a material with a high Heat coefficient and can be at its bottom concave or in another flame shape optimally adapted geometry.

The combustion chamber can be used for better heat retention Firebricks are lined.

This can be done by means of a drive unit Memory block, depending on the version, vertical and be moved horizontally. This procedure is also possible by hand. In this variant, the Memory block on pages guided over rollers or to be hung on a rod. Thereby the combustion chamber increases or decreases.  

When the memory block starts up, the Air supply increased, the burning process in the The combustion chamber is activated. It will be more Thermal energy given to the memory block and this warmed more.

There are vertical ones in the memory block Holes according to the number of heating pipes. These holes can vary in diameter taper below, as through holes or blind holes be trained. At the entry point of the Heating pipes in the storage block can be the holes Show chamfers.

The boiler tubes, slightly smaller in diameter than the holes, with the ends stuck in them Holes and can be moved vertically through the Blocks of memory more or less as required be immersed. The boiler tubes can also through be passed through the memory block, this Variant preferably takes place at gas or Oil burners use.

It is convenient to use the ends of the boiler tubes as Caps made of a particularly heat-resistant material to overheat them avoid.

With the immersion depth of the heating pipes in the The burner output is optionally available in the memory block Large and small loads regulated. So that Temperature of the heating pipes and therefore the furnace being controlled.

In a variant of the present invention the memory block also horizontally on the boiler tubes be brought up.  

Since there is no contact between the boiler tubes and the Highly heated memory block is the danger of bursting pipes. It is possible, to bend the heating pipes at a right angle as well also at an angle using one or more kinks to lead upwards.

On the way to the flue gas fireplace Combustion gases from the combustion chamber through one or directed several steam generators.

The memory block can also be divided from individual ones Segments exist. By moving one or of several segments can be single herds or Stove groups supplied separately with heat or be switched off.

The invention is based on a Embodiment are explained in more detail.

Show it

Fig. 1 section through the inventive steam oven,

Fig. 2 end of the heating tube.

The steam oven according to the invention basically consists of a baking chamber 2 and the combustion chamber 1 . The heating pipes 7 run from the combustion chamber 1 to the baking chamber 2 . Above the heating pipes 7 , the baking trays 9 carrying the baked goods 11 are arranged in the baking chamber 2 . The storage block 3 is arranged in the combustion chamber 1 .

This is designed to be vertically movable via the drive 5 . The burner 4 , preferably a gas burner, is arranged below the storage block 3 , which is concave on its underside.

The combustion chamber 1 is connected to the flue gas outlet 8 . A steam generator 6 , which is connected to the water supply 10 , is arranged in the flue gas space 13 . The outlet of the steam generator opens into the baking chamber 2 via the channel 14 . The baking chamber 2 is supplied with the baking steam via the channel 14 .

The memory block 3 has through holes. The storage block can be moved vertically by the drive 5 , so that the ends of the heating tubes dip into the bores in the storage block 3 . This takes place more or less according to the heat requirement in the baking room 2 . The combustion chamber can be enlarged or reduced by moving the storage block 3 vertically. The storage block 3 is heated by the burner 4 . The storage block 3 heated in this way can now deliver its thermal energy to the heating pipes 7 .

The position of the memory block in its lower position - minimum transfer of thermal energy - and in its upper position - maximum transfer of thermal energy. The heat requirement in the baking chamber 2 can thus be controlled by moving the storage block 3 .

For easier insertion of the heating pipes 7 , the bores in the upper area are chamfered or conical.

According to FIG. 2, the ends of the heating pipes 7 projecting into the combustion chamber 1 are provided with the caps 12 , which are conical at the lower end. On the one hand, these serve for the problem-free insertion of the heating pipes 7 into the storage block 3 . On the other hand, the protection of the heating tube ends when they emerge from the bores at the lower end of the storage block 3 .

Claims (5)

1. Steam oven for baked goods, consisting of closed heating pipes, in which the heat is conducted from the furnace into the baking chamber by means of a medium, characterized in that a movable storage block ( 3 ) is arranged in the furnace ( 1 ), the vertical holes corresponding to the Number of heating pipes ( 7 ). 2. Steam oven according to claim 1, characterized in that the storage block ( 3 ) consists of several individually movable segments. 3. steam oven according to claim 1 and 2, characterized in that the memory block (3 made of a material with a high heat coefficient. 4. Steam oven according to claim 1 to 3, characterized in that the storage block ( 3 ) is concavely curved on its underside or has another geometry adapted to the shape of the flame. 5. Steam oven according to claim 1 to 4, characterized in that the holes in the storage block ( 3 ) taper downwards in diameter and are designed as through holes or blind holes.