GB2132338A

GB2132338A - Oven with air circulation

Info

Publication number: GB2132338A
Application number: GB08333429A
Authority: GB
Inventors: Josef Gerl
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-12-22
Filing date: 1983-12-15
Publication date: 1984-07-04
Also published as: DE3247566C2; GB2132338B; CH661583A5; IT8324257A0; GB8333429D0; AT381439B; FR2538509A1; IT1168995B; DE3247566A1; FR2538509B1; ATA434483A

Abstract

An oven comprises a circulating air blower, a fan wheel (19) of which lies behind a baffle wall (12), which at least in part bounds a cooking space (1) of the oven at one side and which has a central induction opening (18), air guide elements, and exhaust openings (16, 17) in the proximity of adjoining side walls (7, 8) of the cooking space. A heater element (4) is present in the proximity of an upper wall (3). The induction opening (18) and the fan wheel (19) are arranged above the horizontal central cooking space plane and the exhaust openings (16, 17) are arranged one on each side of the fan wheel (19) at different spacings from the heater element (4), the exhaust opening (16) for a downwardly directed air current from the fan wheel having a smaller spacing from this element than the exhaust opening (17) for an upwardly directed air current. <IMAGE>

Description

SPECIFICATION Oven with air circulation The present invention relates to an oven with air circulation.

In ovens with circulating air blowers, the blower housing and the induction opening of an associated baffle wall are usually arranged in the region of the central plane of the cooking space, whereby it is hoped to achieve a uniform flow distribution in the cooking space. In grilling operation and above all during operation of the oven, during whihc the grill serves to provide upper heating, air blown out of lateral exhaust openings flows around the heated grill heating eiement, for example above the blower, and takes up heat. Trials have shown that a build-up of heat forms in the upper cooking space region, while lower temperatures prevail in the region further down, for example in the region of the central plane of the cooking space, whereby a nonuniform cooking of stock takes place, particularly in the presence of two metal baking trays.

There is therefore a need for improved and more effective air circulation in the region of the cooking space, in which the stock to be cooked is disposed, with the use of constructionally simple means.

According to the present invention there is provided an oven comprising a cooking space bounded by a plurality of walls including a first wall at one side of the space, second and third walls each adjoining a respective one of two mutually opposite sides of the first wall, and a fourth wall extending between the second and third walls, an air flow baffle element forming at least part of the first wall and defining a central induction opening, air guide elements, and two exhaust openings which are each arranged in the region of a respective one of the second and third walls, a blower comprising a fan wheel rotatable in a given direction and disposed behind the baffle element and between the exhaust openings, and a heating arranged in the region of the fourth wall, the induction opening and the fan wheel being disposed between the heating element and a plane extending centrally across the cooking space and through the second and third walls, and the exhaust openings being so arranged at respectively different spacings from the heater element as to be displaced into the rotational direction of the fan wheel with respect to rotationally equal spacing from the element.

Through the particular arrangement of the induction opening, the air heated directly by the heater element may be drawn away more strongly and conveyed into the part of the cooking space in which food to be cooked is present. This can take place in view of the fact that the geometric arrangement of the exhaust openings on both sides of the fan wheel is individually adapted to the flow directions of the air currents emanating from the fan wheel at both sides thereof, i.e. the air current originally directed away from the food to be cooked is now conducted by one exhaust opening in the direction of the food, whilst the other exhaust opening can be further away from the food since the air current there has the tendency to flow in direction of the food. This arrangement may avoid difficulties in cooking of food on metal baking trays arranged one above the other.It is ensured that the food is acted on by heated air from both sides, thus from both exhaust openings by contrast with known circulating air ovens, in which always one air current at least does not get directly to the food. In so-called circulating air grills in which the flowing circulating air is heated exclusively at a grill heater element within the cooking space, the particular advantage results that intensive air circulation takes place and with uniform heat distribution predominantly in the middle and upper cooking space regions, whilst no noteworthy air circulation and thereby no noteworthy heating occur in the lowermost cooking space region, thus where fat collects and could lead to strong smoke development.

An embodiment of the present invention will now be more particularly described by way of example with reference to the accompanying drawings, in which: Fig. 1 is a schematic, perspective illustration of a baking oven embodying the invention; Fig. 2 is a view from the front, with opened oven door, of the oven of Fig. 1; and Fig. 3 is a cross-section of the oven on the line Ill-Ill of Fig. 2.

Referring now to the drawings, there is shown an oven having a cooking space 1 bounded by a parallelepipedonal oven muffle 2, which is closable by a door (not shown). A radiant heater element 4 is disposed directly underneath the cooking space ceiling 3. A heater element 6 providing lower heating in the oven is arranged underneath the cooking space bottom 5.

Fastened, for example at two different heights, at the oppositely disposed cooking space side walls 7 and 8 are riblike supports 9 on which, for example, two grate-like or pan-like food carriers 10 or metal baking trays with carrier frames can be mounted. A substantially U-section baffle wall 12, which in part bounds the cooking space at the rear, is disposed on the cooking space rear wall 11. The baffle wall 1 2 consists of a substantially planar, five-sided front part 1 3 and arms 14 and 15, which are bent away at oppositely disposed longitudinal edges of the part 13 and represent air guide elements. The arm 1 5 at the top longitudinal edge consists of two portions 15' and 15" extending at an angle relative to each other.The arm 14 at the lower longitudinal edge extends rectilinearly and at an angle to the horizontal.

Lateral slot-like exhaust openings 16 and 1 7 are formed between the arms 14 and 15, while lie directly against the wall 11. Disposed in the centre between the exhaust openings 16 and 17 is a central, circularly round induction opening 18, behind which is disposed the fan wheel 1 9 of a circulating air blower (not shown in more detail) which is fastened to the wall 1 The direction of rotation of the fan wheel 1 9 is indicated by an arrow in Figs. 1 and 2.The induction opening 18 and the fan wheel 1 9 in the illustrated embodiment lie above the central horizontal plane of the cooking space and thus in direction towards the heater element 4, i.e. the distance from the bottom 5 to the rotational axis of the fan wheel 1 9 is greater than the spacing from this axis to the ceiling 3. From the fan wheel 19, turning in arrow direction, a downwardly directed air current goes to the right in Fig. 2, whilst an air current, which is substantially directed upwardly as indicated by arrows, emanates from the fan wheel on the oppositely disposed side. Correspondingly, the exhaust opening 1 6 for the downwardly directed air current has a smaller spacing from the heater element 4 than the exhaust opening 17 for the upwardly directed air current.This actually upwardly directed air current is guided by the lower exhaust opening 17 downwardly in the cooking space 1 ,for example between the two carriers 1 0. In this case, the front part 1 3 with the arms 14 and 1 5 form flow passages 20 and 21 at both sides of the fan wheel 1 9.

Since only a part of the wall 11 is covered by the baffle wall 12, sufficient area is present at this wall 11 for, for example, the accommodation of a lamp 22.

As indicated by arrows in Figs. 1 and 2, the air currents emanating from the fan wheel 1 9 flow intensively and uniformly around the middle and upper cooking space regions, wherein these air currents flow around the heated element 4, take up heat there, are strongly inducted at the induction opening 18 in the upper region of the cooking space, and are blown between the carriers 10 or baking trays. A substantial air current does not take place directly at the bottom 5. Through the intensive air circulation in the upper cooking space region, a build-up of heat at the ceiling 3 is avoided.

Claims

1. An oven comprising a cooking space bounded by a plurality of walls including a first wall at one side of the space, second and third walls each adjoining a respective one of two mutually opposite sides of the first wall, and a fourth wall extending between the second and third walls, an air flow baffle element forming at least part of the first wall and defining a central induction opening, air guide elements, and two exhaust openings which are each arranged in the region of a respective one of the second and third walls, a blower comprising a fan wheel rotatable in a given direction and disposed behind the baffle element and between the exhaust openings, and a heating element arranged in the region of the fourth wall, the induction opening and the fan wheel being disposed between the heating element and a plane extending centrally across the cooking space and through the second and third walls, and the exhaust openings being so arranged at respectively different spacings from the heater element as to be displaced into the rotational direction of the fan wheel with respect to rotationally equal spacing from the element.

2. An oven as claimed in claim 1, wherein the heater element is disposed within the cooking space.

3. An oven as claimed in claim 2, wherein the fourth wall forms a ceiling of the cooking space with the heater element disposed to extend below the ceiling, and said plane is the horizontal centre plane of the cooking space, the exhaust opening closer to the heater element being disposed to exhaust an air current having a downward component of movement as discharged from the fan wheel and the exhaust opening further from the heater element being disposed to exhaust an air current having an upward component of movement as discharged from the fan wheel.

4. An oven as claimed in any one of the preceding claims, wherein the centre point of one of the exhaust openings is disposed on one side, and the centre point of the other exhaust opening on the other side, of said plane.

5. An oven as claimed in any one of the preceding claims, wherein the air guide elements extend substantially tangentially to the fan wheel and bound the guide passages each extending from the fan wheel to one of the exhaust openings.

6. An oven as claimed in claim 4, wherein the baffle element has a substantially U-shaped crosssection, the guide elements being provided by the arms of the U.

7. An oven as claimed in claim 5, wherein the guide element closest to the heating element comprises two relatively angled portions and the guide element furthest from the heating element is substantially straight.

8. An oven substantially as hereinbefore described with reference to the accompanying drawings.