Cooking appliance, especially steam cooking appliance

Abstract

Cooking appliance (1) with a fan assembly (4) for cooling an appliance component (3). The fan assembly (4) comprises a radial fan (14), a radial wall (24) annularly enclosing the radial fan (14) with an outlet opening (34), and an air duct system (44) connected to the outlet opening (34). The air duct system (44) comprises two air ducts (5), each with a duct inlet opening (35), and an air guide rib (6) extending tangentially to a circumferential line of the radial fan (14). The air ducts (5) have a first air duct (15) and a second air duct (25). The duct inlet opening (35) of the first air duct (15) is located circumferentially in relation to a direction of rotation of the radial fan (14) upstream of the duct inlet opening (35) of the second air duct (25).The air guide rib (6) is positioned relative to the outlet opening (34) of the radial fan (14) such that the duct inlet opening (35) of the first air duct (15) is smaller than the duct inlet opening (35) of the second air duct (25). The at least two air ducts (5) create a receiving space (23) between them for the at least one device component (3).

Description

The present invention relates to a cooking appliance, and in particular a steam cooking appliance, comprising a housing with a cooking chamber and a cooking chamber opening, and a door closing the cooking chamber opening. The cooking appliance includes at least one fan for cooling at least one appliance component. Such blower systems in cooking appliances are often equipped as cross-flow or radial fans. Cross-flow fans generally enable efficient and quiet airflow. However, their fan characteristics are very sensitive to pressure losses. In modern cooking appliances with a wide range of functions, pressure losses inevitably occur in the air duct system, as there is usually very little installation space available for airflow and the air ducts must, for example, be routed around several appliance components. This often leads to a significant drop in efficiency or airflow volume in cross-flow fans. Unlike cross-flow fans, radial fans are considerably more robust against such pressure losses. However, they deliver the conveyed air volume much less uniformly compared to cross-flow fans. Radial fans typically have their highest performance near the radial outer wall or the radial housing (so-called fan housing screw). This usually results in very uneven airflows in air ducts with more complex geometries. Such uneven airflow in the air duct system is particularly problematic in steam cookers, as the airflow serves both to cool the appliance and to remove steam from the cooking chamber. Tests have shown that with combinations of radial fans and complex air ducts, the steam is often not optimally extracted and is not blown out of the cooker evenly. From German patent application DE 35 16 847 A1, a cooking appliance in the form of an oven is known in which an air duct has a branch, wherein for a section of the duct a first partial airflow is directed above and a second partial airflow is directed below the other partial airflow. The first partial airflow is directed horizontally forward out of the appliance, and the second partial airflow is directed vertically downward into the cooking chamber. The printed document EP 3 184 909 A2 shows an oven as a cooking appliance with a radial fan and a guide element in the air duct. The publication EP 0 949 457 A1 describes that air guides can be provided in an exhaust air duct, with the air guides being directly connected to two separate discharge openings of the fan. In contrast, the object of the present invention is to provide an improved cooking appliance. In particular, the cooking appliance should have a blower system that overcomes the previously discussed disadvantages as far as possible and is preferably also usable with more complex air duct systems. This problem is solved by a cooking appliance with the features of claim 1. Preferred embodiments of the invention are the subject of the dependent claims. Further advantages and features of the invention will become apparent from the exemplary embodiments. The cooking appliance according to the invention is designed in particular as a steam cooking appliance. The cooking appliance comprises a housing with a cooking chamber and a cooking chamber opening, and a door closing the cooking chamber opening. The cooking appliance includes at least one fan for cooling at least one appliance component. The fan comprises at least one radial fan and at least one radial wall annularly enclosing the radial fan with an outlet opening. The fan comprises an air duct system connected to the outlet opening. The air duct system terminates in at least one discharge section, in particular at one appliance front. The air duct system comprises at least two air ducts, each with a duct inlet opening. The air duct system comprises at least one air guide rib extending tangentially (with respect to its longitudinal axis) to a circumferential line of the radial fan.The least two air ducts comprise at least a first air duct and at least a second air duct. The inlet opening of the first air duct is located in the circumferential direction of rotation of the radial fan, ahead of the inlet opening of the second air duct. The air guide rib is positioned relative to the outlet opening of the radial fan such that the inlet opening of the first air duct is smaller and preferably narrower than the inlet opening of the second air duct. The present invention offers many advantages. A significant advantage is the air duct system with its two air ducts, air guide rib, and the targeted distribution of the duct inlet openings. This enables optimal and homogeneous airflow while simultaneously making excellent use of the available installation space. A further advantage is the ability to use a radial fan, which is robust against pressure losses, without incurring the previously discussed disadvantages of this fan design. The air guide rib ensures a particularly uniform distribution of the airflow generated by the radial fan to both air ducts, resulting in homogeneous discharge characteristics even at the exhaust section. In particular, the duct inlet opening of the first air duct extends from the air guide rib, preferably its end facing the radial fan, to the outer side wall of the first air duct. Similarly, the duct inlet opening of the second air duct extends from the air guide rib, preferably its end facing the radial fan, to the outer side wall of the second air duct. The end facing the radial fan is specifically designed as a leading edge. The leading edge is located closer to the side wall of the first air duct than to the side wall of the second air duct. The duct inlet openings can each be defined by an opening plane that runs transversely or perpendicular to the axis of rotation of the radial fan and / or parallel to the horizontal and parallel to the discharge section and / or to the front of the appliance and / or to a cooking chamber door, preferably abutting the leading edge. Preferably, the duct inlet opening of the first air duct has a (minimum) width that is smaller than the (minimum) width of the duct inlet opening of the second air duct. Preferably, the width of the duct inlet opening of the first air duct is less than half the width of the duct inlet opening of the second air duct. In other words, the duct inlet opening of the second air duct is particularly more than twice as wide as the duct inlet opening of the first air duct. In particular, the width of the duct inlet opening of the second air duct is at least 2.5 times the width of the duct inlet opening of the first air duct. For example, the width of the duct inlet opening of the first air duct is 21 mm (+ / - 5 mm). For example, the width of the duct inlet opening of the second air duct is 57 mm (+ / - 10 mm). The width of each duct inlet opening is measured along a line parallel to the exhaust section and / or the front of the appliance and / or a cooking chamber door. However, the specifications described above can also apply to widths of duct inlets measured perpendicular to the longitudinal axis of an air guide rib. In both cases, the width refers to a dimension of the respective duct inlet opening that runs transversely or perpendicularly to the axis of rotation of the radial fan and / or parallel to the horizontal. Similarly, the height refers to a dimension of the respective duct inlet opening that runs transversely or perpendicularly to the horizontal and / or parallel to the axis of rotation of the radial fan. In particular, the air guide rib divides the airflow from the radial fan into two airflows in the area of ​​the outlet opening, preferably immediately before or immediately after, or even directly within, the outlet opening. "Immediately" here refers specifically to a distance that is no greater than half, and preferably one-quarter, and most preferably one-sixth of the fan-rib distance that the air guide rib, especially its leading edge, has to the radial fan. In particular, the air guide rib is inclined (with respect to its longitudinal axis) in the direction of a longitudinal axis of the first air duct. In all embodiments, it is preferred and advantageous for the at least two air ducts to terminate in a common discharge section. Preferably, the at least two air ducts are merged again (immediately) before the common discharge section. Thus, despite the separate air ducts, only one discharge section is required. Furthermore, the air can be discharged across the entire width of the device. Where the air ducts merge, they preferably have a (substantially) identical cross-section. In particular, the cross-section is identical with a deviation of less than 15%, preferably less than 10%, and most preferably less than 5%. It is preferred and advantageous that the air guide rib directs the radially outer airflow of the radial fan into the first air duct and the radially inner airflow of the radial fan into the second air duct. In particular, the airflow of the radial fan can be divided by means of the air guide rib such that radially outer airflow is directed into the first air duct and radially inner airflow is directed into the second air duct. The air guide rib preferably comprises a leading edge facing the radial fan (oriented in the direction of the airflow). In particular, the leading edge is provided by an end of the air guide rib that faces the radial fan. Specifically, this end provides the leading edge. The airflow from the radial fan is split at the leading edge and directed to the two air ducts. Specifically, the leading edge divides the radial fan's outlet opening into two partial openings, each partial opening providing a duct inlet opening. Preferably, the fin-to-wall distance between the leading edge and the radial wall (and / or the outer side wall of the first air duct) along a line perpendicular to the longitudinal axis of the air guide fin is greater than the fan-to-fin distance between the leading edge and the radial fan along a line perpendicular to the longitudinal axis of the air guide fin. Preferably, this line is such that it touches the leading edge. In particular, the minimum fin-to-wall distance between the leading edge and the radial wall (and / or the outer side wall of the first air duct) is greater than the minimum fan-to-fin distance between the leading edge and the radial fan. In particular, the minimum first-rib-wall distance between the leading edge and the radial wall and / or the outer side wall of the first air duct is less than half the minimum second-rib-wall distance between the leading edge and the outer side wall of the second air duct. Specifically, the duct inlet of the second air duct is located closer to the radial fan (at the radial fan's axis of rotation) than the duct inlet of the first air duct. The air guide rib is preferably arranged (essentially) parallel to a main flow direction of the airflow of the radial fan in the area of ​​the outlet opening. This arrangement refers in particular to the longitudinal axis of the air guide rib. Specifically, the air guide rib is arranged such that the leading edge is directly or parallel to the main flow direction. Preferably, the air guide rib is located with its end (or leading edge) facing the radial fan on a circumcircle line or radially within a circumcircle line. The circumcircle line is defined, in particular, by the maximum radius of the radial wall. This allows for a particularly precise division into separate airflows as close as possible to the radial fan. It is also possible for the air guide rib to lie radially outside the circumcircle line defined by the maximum radius of the radial wall, with its end (or leading edge) facing the radial fan. In this case, the distance between the leading edge and the circumcircle line is, in particular, no greater than the length and / or height of the air guide rib and / or the width of the duct inlet opening of the first and / or second air duct. It is advantageous and preferred that the air guide rib is arranged with its leading edge facing the radial fan closer to the radial fan than to the radial wall. In particular, the leading edge has a fan-rib distance to the radial fan that is smaller than the width of the duct inlet opening of the first and / or second air duct. Preferably, a longitudinal axis of the air guide rib (in an imaginary extension) intersects the radial wall. Preferably, the radial fan is arranged eccentrically to the radial wall with respect to its axis of rotation. It is particularly advantageous that the distance between the axis of rotation and the radial wall increases in the direction of rotation or towards the outlet opening. Specifically, the intersection point (of the longitudinal axis of the air guide rib and the radial wall) is located where the distance between the axis of rotation and the radial wall reaches at least 70%, and preferably at least 85%, of the maximum distance between the axis of rotation and the radial wall. It is possible and advantageous that the at least two air ducts downstream (behind) the air guide rib have a (substantially) identical cross-sectional area. In particular, the cross-sectional area is identical with a deviation of less than 15%, preferably less than 10%, and most preferably less than 5%. Specifically, the air ducts have the same cross-section over at least 65%, preferably at least 75%, and most preferably at least 85% of their length. The similarity here refers in particular to the cross-sectional area and / or cross-sectional geometry. According to the invention, at least two air ducts are arranged to form a receiving space for at least one device component. In particular, the device component is positioned between the air ducts. This allows the waste heat from the device component to be dissipated by means of the airflows in the air ducts. This enables a space-saving device architecture with highly effective cooling. The least two air channels preferably each have an outer side wall and an inner side wall. In particular, the outer side walls are connected to the radial wall. Preferably, the outer side walls merge (in one piece) into the radial wall. In particular, the inner side walls define the receiving space for the device component. In particular, the inner side walls are connected to the air guide rib. Preferably, the inner side walls merge (in one piece) into the air guide rib. Preferably, the inner side walls and the air guide rib are at least partially joined together in one piece. The side wall runs transversely to the horizontal or vertically, particularly in the intended operating position. The least two air channels each comprise a base and a lid connecting the inner and outer side walls. The base, in particular, faces the cooking chamber. Preferably, the inner and outer side walls, the base, and the lid together form a completely enclosed wall of the respective air channel. In an advantageous embodiment, the inner side walls and / or the air guide fin form part of a housing body for enclosing at least one device component. This enables direct and therefore particularly effective heat dissipation through the airflow. It is also possible for the inner side walls and / or the air guide fin to be provided in addition to a housing body. It is possible and advantageous for the outer side walls to diverge (essentially) from each other along their longitudinal axes, starting from the radial fan's outlet opening. This results in a funnel-shaped external geometry for the air duct system. Specifically, the receiving space for the at least one device component is arranged (essentially) centrally between the side walls or centered within this funnel-shaped external geometry. In a particularly advantageous embodiment, at least one air guide element is arranged in each of the air ducts. In the first air duct, the air guide element is preferably positioned closer to the outer side wall than to the inner side wall. Similarly, in the second air duct, the air guide element is preferably positioned closer to the inner side wall than to the outer side wall. This further homogenizes the flow velocities and pressure distributions in the individual air ducts before they, for example, converge in the common discharge section. This ensures a particularly uniform airflow at the front of the device. The air guide elements are preferably designed as (straight) ribs or rib-like walls. It is possible and advantageous for the cooking appliance to have at least one steam channel system with at least one steam inlet and at least two steam channels running at least partially parallel to the air channels. In particular, the steam inlet is fluidically connected to the cooking chamber. In particular, each steam channel has at least one steam outlet (opening into one of the air channels). In particular, the steam channels branch off from each other downstream of the steam inlet and create a receiving space for the at least one appliance component between them. This allows for a particularly space-saving integration of the steam channels. In particular, at least two steam channels have a (substantially) identical cross-section. In particular, the cross-section is identical with a deviation of less than 15%, preferably less than 10%, and most preferably less than 5%.The similarity here refers in particular to the cross-sectional area and / or cross-sectional geometry. Preferably, the steam outlets each open into at least one of the at least two air ducts by means of at least one Venturi device. In particular, a negative pressure can be generated in the steam duct system by means of the airflow in the air duct system. This allows steam from the cooking chamber to be drawn into the air duct system. In particular, the air guide elements are arranged downstream of the Venturi devices. In particular, the Venturi devices are arranged upstream of the air guide elements. The vapor channels, in particular, run at least partially in a plane above the air channels. It is also possible that the vapor channels run in a plane below the air channels. In an advantageous embodiment, the Venturi devices each comprise at least one through-opening and at least one collar surrounding the through-opening. Preferably, the steam channels each comprise at least one outlet opening into the associated air channel. In particular, the collar projects at least into the steam channel. In particular, the collar surrounds the through-opening in an annular manner. The through-opening is preferably designed as an elongated slot. Other geometries are also possible. In particular, the through-opening connects the air channel to the steam channel. It is preferred and advantageous that the at least one drain opening has a smaller cross-sectional area than the at least one through-opening. This ensures that water droplets flowing into the air duct via the drain opening are not carried along by the Venturi effect and blown out at the front of the device. In particular, the cross-sectional area of ​​the through-opening is at least twice, at least five times, or at least ten times larger than the cross-sectional area of ​​the drain opening. In particular, the steam ducts each have a sack-like end section. Specifically, the end section comprises an end wall, a base, a ceiling, and side walls. Specifically, the through-opening and / or the drain opening is spaced apart from the end wall. Specifically, the ceiling is inclined towards the end, so that the duct height decreases towards the end. This allows the condensate on the ceiling to drain particularly well towards the drain opening. Specifically, the drain opening is located closer to the end wall than the through-opening. Specifically, the drain opening has no collar. Specifically, the drain opening is flush with the base (or ceiling). In particular, an (imaginary) line intersecting the radial fan's axis of rotation and perpendicular to the discharge section and / or the front of the unit has a (minimal) fin position distance to the leading edge, which is greater than the width of the duct inlet of the first air duct and / or less than the width of the duct inlet of the second air duct. Here, the fin position distance is measured parallel to the discharge section and / or the front of the unit. Specifically, this fin position distance is less than twice the width of the duct inlet of the first air duct and / or more than half the width of the duct inlet of the second air duct. For example, this fin position distance is 39 mm (+ / - 8 mm). In particular, an (imaginary) line that intersects the axis of rotation of the radial fan and runs parallel to the discharge section and / or the front of the unit has a (minimal) fin opening distance to the leading edge, which is greater than the width of the duct inlet opening of the first air duct and / or less than the width of the duct inlet opening of the second air duct. Here, the fin opening distance is measured perpendicular to the discharge section and / or the front of the unit. This fin opening distance is, in particular, 52 mm (+ / - 10 mm). In particular, the (minimal) distance between the fan fins and the leading edge of the radial fan is less than the width of the duct inlet opening of the first air duct. Specifically, this distance is 15 mm (+ / - 3 mm). Here, the distance is measured in the radial and / or tangential direction to the radial fan. The appliance component is, in particular, an electronic component or includes one. The appliance component can also be a drive for a (lye) distribution wheel of an oven cleaning system. In particular, the discharge section is located at the front of the appliance. In particular, the oven opening and / or the door are located at the front of the appliance. The longitudinal axis of the air guide ribs and / or the longitudinal axes of the side walls run, in particular, transversely to the axis of rotation of the radial fan. The blower device is designed, in particular, as a radial blower. The radial fan has, in particular, a suction side for drawing in air and at least one pressure side for blowing out air. The outlet opening is, in particular, on the pressure side. When, within the scope of the present invention, reference is made to the radial fan in terms of position, this refers specifically to its (maximum) outer circumference. The circumferential line of the radial fan is, in particular, a maximum circumferential line. Within the scope of the present invention, the term "radial fan" refers specifically to the impeller. Therefore, the terms "radial fan" and "impeller" can be used synonymously. Further advantages and features of the present invention will become apparent from the exemplary embodiments, which are explained below with reference to the accompanying figures. The figures show: Fig. 1 a purely schematic representation of a cooking device according to the invention in a perspective view; Fig. 2 a purely schematic representation of a cooking device according to the invention in a sectional top view; Figs. 3-6 detailed views of the cooking device according to Fig. 2, each in a sectional top view; Fig. 7 a purely schematic representation of another cooking device according to the invention in a sectional top view; and Fig. 8 a purely schematic detailed view of the cooking device according to Fig. 6 in a sectional side view. Fig. 1 shows a cooking appliance 1 according to the invention, comprising a housing 2 with a heated cooking chamber 12 and a door 32 for closing a cooking chamber opening 22. The cooking appliance 1 is designed here as a steam cooking appliance 10 and includes a steam generator concealed inside the appliance. A fan 4 serves to cool appliance components 3 and, for example, an electronic component 13 or the like. An exhaust section 54 of the fan 4 is arranged on an appliance front 42. Figure 2 shows the blower assembly 4 in more detail, which comprises a radial fan 14 and a radial wall 24 with an outlet opening 34, as well as an air duct system 44 leading into the discharge section 54. The radial fan 14 is arranged eccentrically to the radial wall 24 with respect to its axis of rotation 74. The distance between the axis of rotation 74 and the radial wall 24 increases in the direction of rotation (indicated by a curved, dashed arrow) and in the direction of the outlet opening 34. The air duct system 44 comprises an air guide rib 6 with a leading edge 16 and two air ducts 5, namely a first air duct 15 and a second air duct 25, each with a duct inlet opening 35. The duct inlet opening 35 of the first air duct 15 is located circumferentially in the direction of rotation of the radial fan 14 upstream of the duct inlet opening 35 of the second air duct 25. The duct inlet opening 35 of the first air duct 15 extends from its outer side wall 45 to the leading edge. The duct inlet opening 35 of the second air duct 25 extends from its outer side wall 45 to the leading edge 16. The air guide rib 6 runs tangentially to a circumferential line of the radial fan 14 and directs the airflow that lies radially further outwards into the first air duct 15. It directs the air flowing radially further inwards into the second air duct 25. The air guide rib 6 is positioned in the area of ​​the outlet opening 34 such that the duct inlet opening 35 of the first air duct 15 is smaller or narrower than the duct inlet opening 35 of the second air duct. The main direction of airflow in the area of ​​the air guide rib 6 is indicated here by a straight, dashed arrow. The air guide rib 6 is located radially within a circumcircle defined by the maximum radius of the radial wall 24. The leading edge 16 is positioned closer to the radial fan 14 than to the radial wall 24. The air guide rib 6 is inclined here (with respect to its longitudinal axis) towards the first air duct 15. Downstream of the air guide rib 6, the air ducts 5 have the same cross-sectional area. Immediately before the discharge section 54, the air ducts 5 merge again. Overall, this enables a very targeted distribution of the airflow from the radial fan 14, so that the two air ducts 5 have the same or very similar volume flows. The orientation and arrangement of the air guide rib 6 shown here takes into account the highly uneven flow velocities and pressure distributions of the radial fan 14 at the outlet opening 34. In other words, despite the very inhomogeneous flow velocities and pressure conditions of the radial fan 14, the air guide rib 6 ensures a particularly homogeneous air distribution to the air ducts 5. A significant advantage is also that the uniform air distribution of the airflow from the radial fan 14 is achieved over a particularly short distance. Therefore, the invention can also be advantageously implemented in cooking appliances 1 with particularly confined installation space. The air ducts 5 each have an outer side wall 45 and an inner side wall 55. On the side facing away from the inside of the duct, the outer side walls 45 are equipped with mounting flanges 84. The radial wall 24 is also equipped with a mounting flange 84. Thus, the air duct system 44 can, for example, be mounted on an upper cooking chamber wall of the housing unit 2. Since the two air ducts 54 diverge from each other with respect to their longitudinal axes in the direction of the discharge section 54, a funnel-shaped outer geometry 64 results. The air ducts 5 span a receiving space 23 between them, in which one or more device components 3 can be arranged. The inner side walls 55 here form sections of a housing body for the device component 3. Between the air guide rib 6 and the common discharge section 54, an air guide element 8 is arranged in each of the air ducts 5. The air guide elements 8 are also designed as ribs or rib-like walls and are arranged essentially parallel to the main flow direction. The air guide element 8 in the first air duct 15 is located closer to the outer side wall 45 than to the inner side wall 55. The air guide element 8 in the second air duct 24, however, is located closer to the inner side wall 55 than to the outer side wall 45. This achieves a targeted homogenization of the airflows before they merge at the discharge section 54. Furthermore, this results in significant advantages for the extraction of fumes, which will be described in more detail with reference to Figures 7 and 8. Fig. 3 shows a particularly advantageous arrangement of the air guide rib 6. This results in a width of 150 for the duct inlet opening 35 of the first air duct 15, which is less than half the width 250 of the duct inlet opening 35 of the second air duct 25. The widths 150 and 250 are measured here along a dashed line running parallel to the discharge section 54 and the front of the device 42. For example, the width 150 of the first air duct 15 is 21 mm and the width 250 of the second air duct 25 is 57 mm. Fig. 4 shows a variant in which the width 150a of the first air duct 15 is less than half the width 250a of the second air duct 25. Thus, here too, the duct inlet opening 35 of the first air duct 15 is narrower than the duct inlet opening 35 of the second air duct 25. The respective widths 150a and 250a are measured perpendicular to a longitudinal axis 26 of the air guide rib 6. Figure 5 illustrates the orientation of the air guide fin 6 in relation to the airflow in the outlet opening 34 of the radial fan 14. The fin-wall distance 161 between the leading edge 16 and the radial wall 24 or the outer side wall 45 is greater than the fan-fin distance 162 between the leading edge 16 and the maximum outer circumference of the radial fan 14. The fin-wall distance is measured here along a line perpendicular to the longitudinal axis 26 of the air guide fin 6 and touching the leading edge 16. The fan-fin distance 162 is, for example, 15 mm. Figure 6 shows an advantageous arrangement of the air guide rib 6 in relation to the axis of rotation 74 of the radial fan 14. The leading edge 16 has a rib opening distance 163 from a dashed line that intersects the axis of rotation 74 and runs parallel to the discharge section 54 or the front of the device 42. This rib opening distance 163 is 52 mm. The rib position distance 164 of the leading edge 16 to a dashed line that intersects the axis of rotation 74 and runs perpendicular to the discharge section 54 or the front of the device 42 is 39 mm. With reference to Figures 7 and 8, a steam duct system 7 for removing steam from the cooking chamber 12 will now be described in more detail. The steam duct system 7 comprises a steam inlet 17 and two steam ducts 47, each of which is connected to the air ducts 5 via a steam outlet 27. The steam ducts 47 run above the air ducts 5 and each has a base 107, a ceiling 97, and an end wall 87. The steam outlets 27 each have a Venturi device 37 with two through-openings 57. The through-openings 57 are each surrounded by a collar 67, which projects into the steam duct 47 and also into the air duct 5. In addition, the steam outlets 27 each have a drain opening 77. When a flow connection to the cooking chamber 12 is opened during operation, the steam can flow into the steam channels 47 via the steam outlet 17. The airflow in the air duct system 44 creates a negative pressure at the Venturi devices 37, causing the steam to be drawn into the air channels 15 and 25. From there, the steam is then expelled via the exhaust section 54. Due to the previously described air guide elements 8 and their asymmetrical arrangement, essentially the same pressure conditions result for all Venturi devices 37. Condensed vapors run down the sloping ceiling 97 towards the end wall 87 to a sack-like end of the steam ducts 47 and drip off there. The collars 67 prevent condensate that has dripped onto the floor 107 from being drawn through the through-openings 57. The drain openings 77 are considerably smaller than the through-openings 57, so that no significant Venturi effect occurs. As a result, the liquid that has formed in the area of ​​the drain opening in 77 is not carried along by the airflow in the air ducts 5. The liquid drips through the drain openings 77 into the air ducts 5 and can evaporate there in the airflow. This prevents droplets from being blown out at the exhaust section 54. Reference symbol list 1 Cooking appliance 2 Housing assembly 3 Appliance component 4 Blower assembly 5 Air duct 6 Air guide fin 7 Steam duct system 8 Air guide element 10 Steam cooker 12 Cooking chamber 13 Electronic component 14 Radial fan 15 First air duct 16 Leading edge 17 Steam inlet 22 Cooking chamber opening 23 Receiving chamber 24 Radial wall 25 Second air duct 26 Longitudinal axis of air guide fin 27 Steam outlet 32 ​​Door 34 Outlet opening 35 Duct inlet opening 37 Venturi assembly 42 Appliance front 44 Air duct system 45 Outer side wall 47 Steam duct 54 Discharge section 55 Inner side wall 57 Passage opening 64 External geometry 67 Collar 74 Axis of rotation 77 Drain opening 84 Mounting flange 87 End wall 97 Ceiling 107 Floor 150 Width of the first air duct 150a Width of first air duct 161 Rib-wall spacing 162 Fan-rib spacing 163 Rib-opening spacing 164 Rib-position spacing 250 Width of second air duct 250a Width of second air duct

Claims

Cooking appliance (1) comprising a housing (2) with a cooking chamber (12) and a cooking chamber opening (22) and a door (32) closing the cooking chamber opening (22) and comprising at least one blower assembly (4) for cooling at least one appliance component (3), wherein the blower assembly (4) comprises at least one radial fan (14), a radial wall (24) annularly enclosing the radial fan (14) with an outlet opening (34) and an air duct system (44) connected to the outlet opening (34), wherein the air duct system (44) opens into at least one discharge section (54), wherein the air duct system (44) comprises at least two air ducts (5) each with a duct inlet opening (35) and wherein the at least two air ducts (5) comprise a first air duct (15) and a second air duct (25),wherein the duct inlet opening (35) of the first air duct (15) is located circumferentially in relation to a direction of rotation of the radial fan (14) in the direction of rotation of the second air duct (25) and wherein the air duct system (44) comprises at least one air guide rib (6) extending tangentially to a circumferential line of the radial fan (14), wherein the air guide rib (6) is positioned relative to the outlet opening (34) of the radial fan (14) such that the duct inlet opening (35) of the first air duct (15) is smaller than the duct inlet opening (35) of the second air duct (25), and wherein the at least two air ducts (5) span a receiving space (23) between them for the at least one device component (3). Cooking appliance (1) according to claim 1, characterized in that the channel inlet opening (35) of the first air channel (15) has a width (150) which is less than half the width (250) of the channel inlet opening (35) of the second air channel (25), and that the widths (150, 250) are each measured along a line running parallel to the discharge section (54) and / or parallel to a device front (42). Cooking appliance (1) according to one of the preceding claims, characterized in that the at least two air channels (5) open into a common discharge section (54) and are brought together again before the common discharge section (54). Cooking appliance (1) according to one of the preceding claims, characterized in that the air guide rib (6) directs the radially outward flowing air of the airflow of the radial fan (14) into the first air channel (15) and the radially inward flowing air of the airflow of the radial fan (14) into the second air channel (25). Cooking appliance (1) according to one of the preceding claims, characterized in that the air guide rib (6) comprises a leading edge (16) facing the radial fan (14) and that a rib-wall distance (161) between the leading edge (16) and the radial wall (24) and / or an outer side wall (45) of the first air duct (15) along a line perpendicular to the longitudinal axis (26) of the air guide rib (6) is greater than a fan-rib distance (162) between the leading edge (16) and the radial fan (14) along a line perpendicular to the longitudinal axis (26) of the air guide rib (6). Cooking appliance (1) according to one of the preceding claims, characterized in that the air guide rib (6) is arranged parallel to a main flow direction of the airflow of the radial fan (14) in the area of ​​the outlet opening (34). Cooking appliance (1) according to one of the preceding claims, characterized in that the air guide rib (6) is located with an end facing the radial fan (14) on or radially within a circumcircular line which is defined by the maximum radius of the radial wall (24). Cooking appliance (1) according to one of the preceding claims, characterized in that the air guide rib (6) is arranged with an end facing the radial fan (14) closer to the radial fan (14) than to the radial wall (24). Cooking appliance (1) according to one of the preceding claims, characterized in that at least two air channels (5) downstream of the air guide rib (6) have the same channel cross-section. Cooking device (1) according to the preceding claim, characterized in that the at least two air channels (5) each have an outer side wall (45) and each have an inner side wall (55) and that the outer side walls (45) are connected to the radial wall (24) and that the inner side walls (55) define the receiving space (23) and are connected to the air guide rib (6). Cooking appliance (1) according to one of the two preceding claims, characterized in that the outer side walls (45) move away from each other starting from the outlet opening (34) of the radial fan (14) with respect to their side wall longitudinal axes, so that a funnel-shaped outer geometry (64) results for the air duct system (44). Cooking appliance (1) according to one of the three preceding claims, characterized in that at least one air guide element (8) is arranged in each of the air channels (5) and that the air guide element (8) in the first air channel (15) is arranged closer to the outer side wall (45) than to the inner side wall (55) and that the air guide element (8) in the second air channel (25) is arranged closer to the inner side wall (55) than to the outer side wall (45). Cooking appliance (1) according to one of the preceding claims, wherein the cooking appliance (1) is designed as a steam cooking appliance (10). Cooking appliance (1) according to one of the preceding claims, characterized by at least one steam channel system (7) with at least one steam inlet (17) and with at least two steam channels (47) running at least partially parallel to the air channels (5), each with at least one steam outlet (27), and characterized in that the steam channels (47) branch off from each other downstream of the steam inlet (17) and span the receiving space (23) for the at least one appliance component (3) between them, and that the steam outlets (27) each open into at least one air channel (5) by means of at least one Venturi device (37). Cooking appliance (1) according to the preceding claim, characterized in that the Venturi devices (37) each comprise at least one through-opening (57) and each comprise at least one collar (67) surrounding the through-opening (57), and that the steam channels (47) each comprise at least one drain opening (77) opening into the associated air channel (5), and that the at least one drain opening (77) has a smaller opening cross-section than the at least one through-opening (57).

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