RU2196426C2 - Baking oven - Google Patents

Abstract

FIELD: baking industry. SUBSTANCE: baking oven has tunnel-type baking chamber, traveling hearth, and heating system including combustion device, connecting gas conduits, distributing collectors arranged in hearth and dome, and U-shaped upper front and rear tubular channels and U-shaped lower front and rear tubular channels. Combustion device is terminated with T-piece, two outputs of which are connected at different sides of baking chamber through gas conduits to dome and hearth distributing collectors in single vertical section. Part or all U-shaped channels are accomplished in the following manner: straight portion of U-shaped tubular channel is divided into two parts, with first part having additional inner channel of smaller diameter. Each of outer and inner channels in distributing collector are equipped with individual slide valve. Outer channel is separated by partition wall from subsequent channel of second part of straight portion and is equipped with bypass branch pipe leading to return portion. Baking oven of such construction allows three or four adjustable zones to be provided along baking oven length. EFFECT: increased efficiency by precise baking mode and improved quality of bakery products. 3 dwg

Description

 The invention relates to the baking industry of the food industry, namely to tunnel baking ovens with channel heating of the baking chamber and recirculation of combustion products, which can be used for baking a wide range of bakery products.

 Famous baking oven (Promotional brochure of England AR Baker, 1987. Convectoradiant baking oven of the English company "Baker Perkins Limited"), containing a tunnel baking chamber, a conveyor belt and a heating system. The heating system of the known furnace includes a combustion device, connecting flues, distribution headers of the hearth and arch, the upper front and rear, as well as the lower front and rear U-shaped tubular channels, and the distribution manifolds are located in one place of the furnace - near the furnace device located above them.

 A disadvantage of the known furnace is the presence of only two zones for setting the thermal regime along the length of the baking chamber, which is determined by the position of the distribution manifolds in the middle part of the length of the baking chamber, from which the heating gas mixture passes through the front and rear U-shaped tubular channels, the heat of which is transferred in a baking chamber for baking bakery products.

 It is known that for baking high-quality bakery products, the baking mode along the length of the baking chamber must be set by three or more adjustable zones.

 Another well-known baking oven (RU 2128483 C1, publ. 10.04.1999) is the closest to the claimed invention and is selected as a prototype.

 The known furnace contains a tunnel baking chamber, a conveyor belt and a heating system.

 The heating system includes a combustion device, connecting flues, distribution headers of the hearth and arch, upper front and rear and lower front and rear U-shaped tubular channels. The furnace uses two distribution manifolds located one above the other.

 The furnace device is located above the baking chamber, along it and ends with a tee with two transverse exits, which in turn are in the same vertical section with the distribution manifolds. Using connecting ducts, the exits from the combustion device are connected on one side of the baking chamber to the distribution manifold of the hearth and, on the other hand, to the distribution manifold of the arch.

 The distribution headers of the hearth and arch are equipped with control gates for each direction of the front or rear U-shaped tubular channels, and the passage area at the entrance to the tubular channels varies along the width of the baking chamber for one direction.

 The prototype, in spite of the regulating gates in the distribution manifolds, has the same drawback as the oven (Promotional brochure of England by AR Baker, 1987. Convectoradiant bakery oven of the English company "Baker Perkins Limited"), i.e. when using one furnace device in the furnace along the length of the baking chamber, only two adjustable heating zones are created.

 Any external bypass channels outside the baking chamber reduce the efficiency of the furnace.

 The task of the invention is to improve the quality of baked bakery products by providing a more accurate baking regime with three or four adjustable heating zones along the length of the baking chamber.

 The solution to this problem is achieved by the fact that in a baking oven containing a tunnel baking chamber, a conveyor belt and a heating system, including a furnace, connecting flues, distribution headers of the hearth and arch, upper front and rear and lower front and rear U-shaped tubular channels.

 The furnace device ends with a tee, two exits from which are connected on different sides of the baking chamber by gas ducts with distribution headers of the hearth and arch in one vertical section, and according to the invention, the straight branch of the U-shaped tubular channel in the direction of movement of the heating gas mixture is divided into two sections, the first of which are made with an additional internal channel of a smaller diameter, the external and internal channels in the distribution manifold provided with separate gates, and the external channel is separated by regorodkoy subsequent channel from the second portion has a forward branch and the bypass pipe in the opposite branch.

 The described technical solution makes it possible to provide three or four zones for regulating the thermal regime along the length of the baking chamber by directing additional independent flows of heating gas regulated by individual gates from distribution manifolds. The invention is illustrated by the accompanying drawings of figures 1, 2, 3.

 Figure 1 shows the connection of the U-shaped tubular channel 1 to the distribution manifold 2. The straight branch 3 of the U-shaped tubular channel 1 is divided into two sections: the first and second.

 In the first section of the straight branch 3 inside the main channel 4, an additional channel 5 of smaller diameter is made. The external channel 4 is separated from the channel 6 of the second section by a partition 7 and has a bypass pipe 8 into the return branch 9 of the U-shaped tubular channel 1.

 In the distribution manifold 2, the outer channel 4 and the inner channel 5 are provided with separate gates 10 and 11.

 Figure 2 shows a baking oven using the technical solution of figure 1 to create three zones of regulation of thermal conditions along the length of the baking chamber.

 FIG. 3 shows a baking oven using the technical solution of FIG. 1 to create four zones of regulation of thermal conditions along the length of the baking chamber.

 Bakery oven operates as follows. The heating gas mixture entering the distribution manifolds 2 is divided into two streams at the entrance to each U-shaped tubular channel 1, one of which passes through the external channel 4 in the first section of the straight branch, and then separated by a partition 7 through the bypass pipe 8 enters the return branch 9. The second stream passes through the internal channel 5 of the first section to the channel 6 of the second section of the straight branch and then to the return branch 9. With the help of scrapers 10 and 11, these heating gas flows can be regulated.

 Combinations of the structures of the described U-shaped tubular channels with separated streams and with non-separated ones make it possible to obtain three or four adjustable zones along the length of the baking chamber, which will improve the quality of baked bakery products.

Claims (1)

 A bakery oven comprising: a tunnel baking chamber, a conveyor belt and a heating system including a combustion device, connecting ducts, upper front and rear U-shaped tubular channels having a common distribution manifold connected to the furnace device on one side, and lower front and rear U-shaped tubular channels having a common distribution manifold connected to the combustion device from the opposite side by means of a supply connecting duct in which an regulating flap, characterized in that the straight branch of the U-shaped tubular channel in the direction of movement of the heating gas mixture is divided into two sections, the first of which is made with an additional internal channel of smaller diameter, the external channel being separated by a partition from the subsequent channel of the second section of the straight branch and has bypass pipe to the return branch.

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