The invention relates to an oven according to the preamble of
Claim 1 and a method according to the preamble of the claim
are used in the food industry.
Such an oven is in the DE 89 04 998 U1
described. This oven is designed like a cabinet and therefore has a bottom wall, a ceiling wall, two side walls, a rear wall and a frontally arranged cabinet door, which together form a closed oven interior. On the rear wall there are several flat aligned and evenly spaced superposed heating plates of a heating system. These heating plates are arranged cantilevered or stored on support arms, which are also anchored in the rear wall.
their width are the heating plates opposite the clear width dimension of the furnace interior
that between the heating plates and the respective side wall
the whole height of the
Furnace space extending free space remains. In the interior
the oven is a mobile bakery car parked with
its vertical supports
in the lateral free spaces
between the heating plates and the side walls and engages with
its horizontal shelves
fits between the heating plates. This is under every shelf
the baking tray a heating plate of the oven arranged.
Hotplates of the oven are over
a heating circuit connected to an external boiler, the
a heated one
Heat transfer through
promotes the heating plates.
Such a hot plate is usually made of two against each other
laid profile sheets formed on their contact surfaces in
are. The cavities between the welds form a
Heating channel consisting of one, two or more Teilheizkanälen,
which together the fuel oil flow
within the heating plate divided into several parallel Teilheizströme.
All partial heating channels
have the same cross-section so that the heat distribution is even.
is such a heating plate in the so-called blowing process, in which
two smooth sheet metal plates in a similar manner by a resistance welding process
welded together and
those lying between the welds
set within a mold under the pressure of a medium
become. As a result, the gaps between the heating channels widen.
Here is that the blowing process is a complex workshop technology
requires and that because of the weld at the outer edges
the heating plate remains a circumferential ridge. This bridge widened
the distance between the outer Teilheizkanal
and the side walls
of the oven, so in this outer area
the actually even heat distribution
From the DE 296 16 533 U1
Now a hot plate for such an oven has become known, which consists of two preformed profile sheets. This heating plate has on each side an outer Teilheizkanal whose cross-section is larger than the other Teilheizkanäle. This will transport more heat to the edge of the oven. In an alternative embodiment, the outer edge welding is angled relative to the Heizplattenebene, so that there is a different cross-sectional shape at the outer Heizteilkanal compared to all other Teilheizkanälen. This also means that more heat is transported to the edge area of the oven because the fuel oil flow is shifted further outwards.
This hot plate is in the same time as the profiling
the two sheet metal plates, an edge strip is folded, the at
the one profiled sheet metal longer
than the other profile sheet metal plate. In assembled condition
Both edge strips of the two profile sheet metal plates are in the installation position
aligned below, lie against each other and have the same
Here is this common length
dimensioned so that there is enough space for a weld.
Both profile sheet metal plates are on the usual bearing surfaces and
on the edge strip by a conventional resistance welding method
This hot plate and the corresponding manufacturing process have disadvantages. Thus, the hot plate is very material intensive and therefore expensive because of the additional and insignificant for the heat supply edge strip. In addition, the two profile sheet metal plates are different in their dimensions and in their shape and must therefore be treated separately in the manufacturing process. This also makes the production more expensive. The manufacturing process is also complicated by the fact that the bearing surfaces of the two profiled sheet metal plates and the two adjoining edge strips must be welded with the same resistance welding process but in different fixtures. This is particularly laborious and time consuming because of the size and severity of the profiled sheet metal plates. Another disadvantage is that the edge strips nachfedern in the profiling and thus form an obtuse angle to the heating plate. Because of the different lengths of the two edges strip and because of the not always the same material properties of the profiled sheet metal plates, the edge strips feather differently for each heating plate, so that both superimposed profiled sheet metal plates no longer fit together properly. This requires rework or increased effort during assembly and subsequent welding.
Invention is therefore based on the object, the use of materials
a generic heating plate
to reduce and simplify the production of the new heating plate.
Device-side task is characterized by the characterizing features
of the claim 1 and the method-side task is characterized by the characterizing
Characteristics of claim 5 solved.
Embodiments emerge from the subclaims 2 to 4 and the dependent claims 6 to
new heating plate and the new manufacturing process eliminate the
mentioned disadvantages of the prior art.
the particular advantage is that the edge strips with the
Bending obtained a very accurate position, the subsequent assembly
Invention is based on an embodiment
be explained in more detail.
1 a vertical section through an oven without a baking tray,
2 : the front view of the oven with an off-the-shelf baking cart and with the oven door open,
3 : the top view of the new hotplate and
4 : a cross section through part of the new heating plate.
After the 1 and 2 the oven is designed as a cabinet and therefore has a back wall 1 , two side walls 2 , a ceiling wall 3 and a bottom wall 4 , The frontage is over its entire dimensions through an oven door 5 locked. This results in a closed oven interior, which is characterized by a plurality of heating plates 6 is filled. In the area of the ceiling wall 3 and behind the back wall 1 There are storage spaces in which supply lines and control units are housed, which are the heating plates 6 and connect the open space with external utilities for heating and ventilating the furnace interior. As a heat carrier, a thermal oil is preferably used.
The heating plates 6 in the furnace interior are horizontally aligned and arranged in preferably the same vertical distances from each other. The heating plates have 6 Dimensions that are matched to the clear cross section of the furnace interior.
So corresponds the depth of the heating plate 6 the depth of the oven interior, while the width of the heating plate 6 is designed to a certain extent less than the width of the furnace interior. This gauge is sized to fit on both sides of all hotplates 6 and the respective side wall 2 a remains over the entire height of the furnace interior extending free space.
To their holder is every hot plate 6 on two similarly spaced heater plate carrier 7 stored, with the Heizplattenträger 7 self-supporting in the rear wall 1 are anchored in the oven and in their length over the entire depth of the oven interior and thus to the front edge of the heating plate 6 extend. It remains the expert depending on the application reserved, the heating plates 6 direct and self-supporting in the back wall 1 to anchor and thus the Heizplattenträger 7 save.
In the oven interior of the oven is a mobile bakery 8th with vertical supports 9 and with several horizontal shelves 10 parked for the baked goods. It has the bakery car 8th so many shelves 10 how the oven hotplates 6 has. This bakery car 8th is sized to fit with its vertical supports 9 in the lateral clearances between the heating plates 6 and the side walls 2 and with his daring shelves 10 in the spaces between adjacent heating plates 6 fits. So is in the retracted position of the back car 8th every shelf 10 of the baking cart 8th a heating plate 6 associated with the oven.
After 3 owns the heating plate 6 a heating channel via an inlet connection 11 and a return port 12 connected to the external boiler. This heating channel is over the entire width of the heating plate 6 arranged helically and consists of a first Heizteilkanal 13 and a second heating part channel 14 , which are both parallel to each other and together in the inlet connection 11 and in the return port 12 lead.
As the 4 shows, there is the heating plate 6 from an upper profile sheet metal plate 15 and from a lower profile sheet metal plate 16 , the surveys matched in profile 17 and reductions 18 exhibit. This push the opposite lowering 18 both profile sheet metal plates 15 and 16 together and form a helical seam 19 , which terminates pressure-tight. The course of this helical seam 19 arises from the 3 , The surveys 17 both profile sheet metal plates 15 . 16 form in a corresponding manner the Heizteilkanäle 13 and 14 out, whereby for all internal Heizteilkanäle 13 . 14 each gives an approximately lenticular cross-section. The cross section of the outer heating part channel 13 corresponds to the shape of a cut-off lens. This is the upper profile sheet metal plate 15 with an angled edge strip 20 equipped, which is directed downward, while the lower profile sheet metal plate 16 an angled edge strip 21 owns, which is directed upward. Both facing edge strips 20 . 21 are laterally offset so that they overlap and are in lateral contact with each other. These so joined edge strips 20 . 21 form on the two side edges of the heating plate 6 one continuous seam each 22 , which is also sealed pressure-tight.
The sizes of the cross sections of the two Heizteilkanäle 13 . 14 are coordinated so that the cross-section of the long sides of the heating plate 6 lying part of the first Heizteilkanals 13 smaller than the cross section of the adjacent part of the second Heizteilkanals 14 is executed.
The heating plate 6 after the 3 and 4 is made as follows:
Two smooth sheet metal plates are successively cut to the same outer dimensions. Thereafter, each sheet metal plate is profiled on a forming device of a bending machine so that the final shapes of the surveys 17 and the reductions 18 arise. Thereafter, on each profile sheet metal plate 15 . 16 the edge strip 20 respectively. 21 one longitudinal side and then the edge strip 20 respectively. 21 the other and opposite longitudinal side folded. The clear dimension between the two opposite edge strips 20 the profile sheet metal plate 15 and the clear dimension between the two opposite edge strips 21 the profile sheet metal plate 16 is the same size. The two prefabricated profiled sheet metal plates 15 . 16 are initially aligned so that their margins 20 . 21 are directed towards each other. Then the two profile sheet metal plates 15 . 16 put together so that the facing edge strips 20 . 21 glide past each other and the opposite descents 18 come to the mutual investment. By an appropriate selection of the manufacturing tolerance in the clear dimension of the opposite edge strips 20 . 21 or by an oppositely directed deviation of the angle of the two associated edge strips 20 . 21 from the right angle, a tension between the two adjoining edge strips 20 . 21 are generated, the improved grip of both profile sheet metal plates 15 . 16 allows. This improves the handling of the joined profile sheet metal plates 15 . 16 during production.
The pre-assembled heating plate 6 is then along its helical seam 19 and welded at the edges of the two transverse sides in the electrical resistance welding process. Preferably, the seam welding is applied. Then the seam becomes 22 from the overlap of the two edge bands belonging together 20 . 21 on both sides of the heating plate 6 welded over the entire length by means of gas welding or electric arc welding. Both welding processes can be carried out at one location in one clamping.
- rear wall
- Side wall
- ceiling wall
- bottom wall
- oven door
- heating plate
- dare right
- inflow connection
- Return connection
Profile sheet metal plate
Profile sheet metal plate
- Spiral-shaped interface
- edge strips
- edge strips