EP4469728A1 - Vorrichtung zum abführen eines wrasenstroms sowie backofen oder gargerät - Google Patents
Vorrichtung zum abführen eines wrasenstroms sowie backofen oder gargerätInfo
- Publication number
- EP4469728A1 EP4469728A1 EP23700957.6A EP23700957A EP4469728A1 EP 4469728 A1 EP4469728 A1 EP 4469728A1 EP 23700957 A EP23700957 A EP 23700957A EP 4469728 A1 EP4469728 A1 EP 4469728A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vapor
- flow
- section
- opening
- cooling fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2007—Removing cooking fumes from oven cavities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/006—Arrangements for circulation of cooling air
Definitions
- the present disclosure relates to a device for discharging a stream of vapor from a cooking chamber, in particular for an oven or a cooking appliance.
- the present disclosure relates to an oven or a cooking appliance with a cooking chamber and such a device.
- EP 1 619443 A2 discloses a cooking appliance with a cooking chamber, a fan for conveying gas from an intake area outside the cooking chamber into a pressure chamber outside the cooking chamber, a first opening in the cooking chamber, a sensor for detecting vapors escaping through the first opening , a second opening in the cooking chamber, which is arranged at a distance from the first opening and a closure for closing the second opening and a closure control for controlling the closure depending on a signal from the sensor, wherein the blower is designed to generate an overpressure in the pressure chamber and that the first opening opens into the pressure chamber.
- control elements such as flaps, a sensor system and a control unit are required to control the dewaxing, which makes the structure of the device relatively complex.
- the object is therefore to provide a device for discharging a flow of vapor from a cooking chamber, in which constant de-waxing can be ensured in a structurally particularly simple manner.
- the object of the disclosure is achieved by a device for discharging a stream of vapor with the features of claim 1 and by a baking oven or a cooking appliance with the features of the independent claim.
- Advantageous developments are the subject of the subclaims.
- the disclosure relates to a device for discharging a stream of vapor from a cooking chamber, in particular for an oven or a cooking appliance.
- the device has a cooling fan which, in its negative pressure area, has a cooling air intake duct for sucking in a cooling air flow and a vapor intake duct for sucking in a vapor flow from the cooking chamber, and in its pressure area for blowing out a blow-out air flow, in particular a flow mixed from the cooling air flow sucked in and the vapor flow sucked in , is connected to an exhaust duct.
- the pressure area of the cooling fan is connected to the vapor intake duct in such a way that backwashing of part of the exhaust air flow into the vapor flow is possible or part of the exhaust air flow can be/flows into the vapor flow.
- the vapor flow is influenced by backwashing or returning part of the exhaust flow to the vapor flow.
- part of the exhaust flow is added to the vapor flow, which is why the volume flow of the actual vapor flow is reduced or slowed down.
- the cooling fan power increases, the volume flow drawn in from the vapor intake duct also increases.
- the backwash volume also increases, so that the ratio of backwash flow to vapor flow increases. This achieves that depending on the type of connection between the pressure area of the cooling fan and the vapor intake duct, the vapor flow increases only slightly when the cooling fan output is increased, remains constant or even decreases slightly.
- a self-regulating flow-mechanical system is created without external control, in which, despite the use of a common fan, the amount of vapor flow can be decoupled from the control of the amount of cooling air flow.
- the device can have a connecting element, preferably in the form of an opening, which connects the pressure area to the vapor intake channel, bypassing the negative pressure area. This provides a suitable connection for generating the backwash.
- the connecting element can connect the pressure area to the vapor intake duct in such a way that backwashing prevents or reduces the vapor flow flowing into the negative pressure area. This means that backwashing influences the vapor flow like a fluid switch, in particular turning it on, off or reducing it.
- the vapor intake duct can have a guide section with an orifice leading into the vacuum area, with the connecting element being arranged in the area of the guide section and the guide element being designed in such a way that backwashing together with the vapor stream flowing into the vacuum area enters the vacuum area of the cooling fan flows.
- the connecting element can be arranged in the vapor flow upstream of the outlet opening of the guide section.
- the guide section can taper in the direction of the mouth opening. This has the advantage that the flow of vapor is directed into the negative pressure area.
- the backwash can be carried along with the vapor flow.
- a size of the connecting element in particular an opening cross-section of the opening, can be unchangeable and fixed depending on a desired reduction in the flow of vapor by the backwash, in particular when the device is started up.
- the (initial) design of the connecting element thus determines how much the vapor flow is to be reduced by backwashing. This has the advantage that no adjustment elements are required and thus a particularly cost-effective device can be provided.
- a size of the connecting element in particular an opening cross section of the opening, can be adjustable as a function of a desired reduction in the vapor flow due to backwashing.
- the reduction in vapor flow can be set independently of an (initial) design, so that it is also possible to react to changed operating conditions.
- a speed of the cooling fan can be adjustable. This has the advantage that the cooling capacity can be adjusted. At the same time, the presence of backwashing prevents the vapor flow from changing at different speeds and, in particular, from increasing substantially proportionally with the increasing speed.
- the device can be designed such that the flow of vapor flowing into the negative pressure area decreases with increasing speed of the cooling fan if the opening cross section of the opening is larger than a first predetermined opening cross section.
- the device can be designed such that the flow of vapor flowing into the vacuum area remains constant as the speed of the cooling fan increases if the opening cross section of the opening is greater than a second predetermined opening cross section but less than or equal to the first predetermined one opening cross-section is.
- the device can be designed such that the flow of vapor flowing into the negative pressure area increases with increasing speed of the cooling fan if the opening cross section of the opening is less than or equal to a second predetermined opening cross section.
- the device can thus be configured in its design.
- the device can have no additional steam vent. Due to the fact that a suitable de-watering can already be realized via the cooling fan, the device can be designed in a particularly cost-effective manner.
- the device can have no control elements for controlling the vapor flow. Due to the fact that the behavior of the vapor removal can be set via the design as the cooling fan speed increases, the device can be designed in a particularly cost-effective manner without having to accept a continuously increasing vapor flow with increasing cooling fan speed.
- the present disclosure also relates to a baking oven or a cooking appliance, with a cooking space and a device, the vapor intake duct of the device being connected to the cooking space.
- the present disclosure relates to a device for controlling a vapor flow in cooling fans with different speeds.
- the device is used in ovens or cooking appliances, in which a water vapor/fat mixture, the so-called vapors, is generally produced during the cooking process. This vapor generates excess pressure and must be dissipated or be able to escape.
- a dewaxing already exists in ovens and is absolutely necessary for a desired cooking result.
- a mechanical control element can be installed, which determines the vapor flow over the temperature range, for example from 0° to 300°.
- constant dewraining can also be selected with the disadvantage of changing vapor flow, which depends on the fan speed varies.
- the vapors can also be routed into the switch room and from there discharged into the kitchen via the negative pressure area of the cooling fan.
- a constant dewrasing can be achieved due to the lack of an adaptive fan control.
- the cooling fan/cooling air flow in the pressure or suction area can be used to extract vapor from the cooking chamber/oven.
- an opportunity is provided in which an increase in degassing at different cooling fan speeds can be mitigated, held constant, or reduced without additional actuators.
- the vapor is introduced into the vacuum area of the fan by a guide element. Through a suitable connection from the pressure area of the fan to the guide element, the air flow of the vapor is impeded/interrupted by the speed-dependent positive pressure generated by the fan, without the air flow being reversed and fresh air being introduced into the cooking chamber.
- a fluid switch is formed by the cooling air being flushed back into the guiding element of the vapor.
- the air flow can switch the vapor air flow on or off and assume any state in between.
- FIG. 1 shows a basic structure of a device for discharging a stream of vapor from a cooking chamber
- FIG. 2 shows a basic structure of the device in a first embodiment
- 3 shows a basic structure of the device in a second embodiment
- 4 shows a basic structure of the device in a third embodiment
- Fig. 6 is a graph showing a relationship between a fan speed and a vapor flow of the devices shown in Figs. 2 to 5;
- Fig. 7 is a graph showing a relationship between a fan speed and a flow rate of the devices shown in Figs. 2 to 5;
- FIG. 8 shows a schematic representation of an oven or cooking appliance.
- Fig. 1 shows a basic structure of a device 2 for discharging a flow of vapor 16 from a cooking chamber 4, in particular for an oven or a cooking appliance.
- the device 2 has a cooling fan 6 .
- the cooling fan 6 can be designed as a radial cooling fan.
- the cooling fan 6 has a fan wheel 8 and a vacuum area 10 and a pressure area 12 .
- the negative pressure area 10 is identified by minus signs and the pressure area 12 is identified by plus signs.
- the fan wheel 8 By operating the fan wheel 8, i.e. by rotating the fan wheel 8, a pressure difference is generated between the negative pressure area 10 and the pressure area.
- the operation of the fan wheel 8 creates a pressure ratio in the cooling fan 6. Due to the pressure difference, the cooling fan 6 sucks in an air flow in its vacuum area 10, which it releases/blows out in its pressure area 12.
- the cooling fan 6 is in its vacuum area 10 for sucking in a flow of cooling air
- the cooling air intake duct can, for example, open into a switch room of the oven or cooking appliance, ie with be connectable or connected to the switch room, even if this is not explicitly shown.
- the cooling air flow 14 is thus sucked in by the cooling fan 6 .
- the cooling fan 6 is connected in its low-pressure area 10 to a vapor intake channel 18 for sucking in the vapor flow 16 .
- the vapor intake channel 18 can preferably open into the cooking chamber 4, i.e. can be connected or be connected to the cooking chamber 4, even if this is not explicitly shown.
- the cooling fan 6 is in operation, the vapor flow 16 is thus sucked in by the cooling fan 6 (in addition to the cooling air flow 14 ).
- the cooling fan 6 is connected to a blow-out duct for blowing out a blow-out air stream 20 .
- the exhaust duct can preferably be open to the outside of the oven or cooking appliance, in particular into a kitchen, i.e. it can be connected or connected to a space outside the oven or cooking appliance, even if this is not explicitly shown.
- the exhaust air flow 20 is composed essentially of the cooling air flow 14 and the vapor flow 16 .
- the cooling air flow 14 and the vapor flow 16 are mixed in such a way that the exhaust air flow 20 comes out of the oven or oven with temperatures that are not too high.
- the cooling fan 6 can preferably be designed in such a way that a speed of the cooling fan 6 can be adjusted. This means that the cooling fan 6 can be operated with different outputs/speeds, as a result of which the pressure ratio in the cooling fan 6 is changed. At higher speeds, a larger volume flow is promoted than at lower speeds.
- the pressure area 12 of the cooling fan 6 is connected to the vapor intake duct 18 in such a way that backwashing of the exhaust air flow 20 can be introduced into the vapor flow 16 / flows / is admixed thereto.
- the other (considerably larger) part of the exhaust air flow 20 is blown out via the exhaust duct.
- the pressure portion 12 of the cooling fan 6 may be formed in the form of an opening 22 via a connecting member as in the illustrated embodiment.
- the opening 22 forms a fluidic connection to the vapor intake channel 18 .
- the opening 22 is designed in particular in such a way that the backwashing prevents or reduces the flow of vapor 16 flowing into the vacuum area.
- the vapor intake channel 18 can have a guide section 24 with an orifice opening 26 leading into the vacuum area.
- the opening 22 can preferably be arranged in the area of the guide section 24 and the guide element 24 can be designed in such a way that the backwash flows together with the vapor stream 16 flowing into the negative pressure area into the negative pressure area 10 of the cooling fan 6 .
- the opening 22 can be connected to the guide section 24 upstream of the orifice opening 26 .
- the guide section 24 can be an end section of the vapor intake channel 18 whose cross section tapers in the direction of the outlet opening 26 .
- a size of the connector i.e., an opening area of the opening 22 is fixed/not adjustable during operation.
- the opening cross section of the opening 22 is fixed depending on a desired reduction of the vapor flow 16 by the backwash, in particular when the device 2 is put into operation.
- the opening cross-section of the opening 22 is chosen to be relatively large, so that a large counterflow occurs with the backwashing.
- the cooling fan 6 is operated at full power, i.e. with a fan speed of 100%. The large counterflow at the high fan speed reduces the vapor flow 16 (compared to operation of the device 2 without backwashing) considerably.
- the size of the connecting element ie the opening cross section of the opening 22 is fixed/not adjustable during operation.
- the opening cross section of the opening 22 is in Dependence of the desired reduction in vapor flow 16 by backwashing, particularly when the device 2 is put into operation.
- the opening cross-section of the opening 22 is selected to be relatively large, so that a large counterflow occurs with the backwashing.
- the cooling fan 6 is operated with reduced power, ie with a fan speed of 30%. The large counterflow at the low fan speed reduces the vapor flow 16 (compared to operation of the device 2 without backflushing) only insignificantly, since the vapor flow 16 sucked in through the vacuum area 10 of the cooling fan 6 outweighs the backflushing.
- the third embodiment essentially corresponds to the first embodiment.
- the size of the connecting element i.e. the opening area of the opening 22 is fixed/not adjustable during operation.
- the opening cross section of the opening 22 is fixed depending on the desired reduction of the vapor flow 16 by backwashing, in particular when the device 2 is put into operation.
- the opening cross-section of the opening 22 is selected to be relatively small to medium-sized, so that a small to medium/larger countercurrent is produced with the backwashing.
- the opening cross section is smaller than in the case of those shown in Figs. 2 and 3 illustrated embodiments.
- the cooling fan 6 is operated at full power, i.e. with a fan speed of 100%.
- the small to medium/larger counterflow at the high fan speed reduces the vapor flow 16 (compared to operation of the device 2 without backwashing).
- the device 2 shown in FIGS. 1 to 4 is characterized in that it has no additional steam vent.
- the device 2 shown in FIGS. 1 to 4 has no control elements for controlling the vapor flow 16 .
- the device 2 can also be designed such that the size of the connecting element, ie the opening cross section of the opening 22, can be adjusted depending on a desired reduction in the vapor flow 16 by backwashing (during operation), even if this is not shown in the figures is.
- the device 2 has an additional control element for controlling the vapor flow 16 can have, with which the opening cross section of the opening 22 is adjustable and thus the size of the counterflow caused by the backwashing is variable.
- the exemplary device 2 differs from the first to third specific embodiments in that the pressure area 12 of the cooling fan 6 is not connected to the vapor intake duct 18. Thus, no backwashing of the exhaust air flow 20 flows into the vapor flow 16. There is no counterflow. As a result, a speed-dependent negative pressure of the cooling fan 6 causes the vapor flow 16 to rise steadily. With increasing speed of the cooling fan 6, an increasing stream of vapor 16 is thus generated.
- FIG. 6 shows a graph 30 which shows a relationship between a fan speed and a vapor flow 16 of the devices 2 shown in FIGS. 2 to 5.
- the backflushing has no effect on the vapor flow 16.
- the vapor flow 16 increases in the same way up to a fan speed of 30%, independently of the opening cross section.
- a first characteristic curve 32 indicates a course of vapor flow 16 with increasing fan speed, which arises when a large counterflow is generated by backwashing. This means that the opening cross section of the opening 22 is larger than a first predetermined opening cross section. With an increasing fan speed from 30%, the vapor flow 16 is significantly reduced, so that the vapor flow 16 decreases overall.
- the device 2 in the first or second embodiment can be designed in such a way that the vapor flow 16 flowing into the vacuum region 10 (from a predetermined fan speed) decreases with increasing speed of the cooling fan 6 if the opening cross section of the opening 22 is larger than the first predetermined opening cross section.
- a second characteristic curve 34 indicates a course of vapor flow 16 with increasing fan speed, which occurs when a medium/larger counterflow is generated by backwashing. That is, the opening cross-section of the opening 22 is greater than a second predetermined opening cross-section but less than or equal to the first predetermined opening cross section. As the fan speed increases from 30%, the vapor flow 16 is reduced by backwashing to the same extent as it increases due to the increasing fan speed, so that the vapor flow 16 remains constant overall.
- the device 2 in the third embodiment can be designed in such a way that the vapor flow 16 flowing into the negative pressure region 10 (from a predetermined fan speed) remains constant as the speed of the cooling fan 6 increases, if the opening cross section of the opening 22 is greater than the second predetermined opening cross section, but is less than or equal to the first predetermined opening cross section.
- a third characteristic curve 36 indicates a course of vapor flow 16 with increasing fan speed, which occurs when a small counterflow is generated by backwashing. This means that the opening cross section of the opening 22 is less than or equal to the second predetermined opening cross section. As the fan speed increases from 30%, the vapor flow 16 is reduced to a lesser extent by backwashing, as it increases as a result of the increasing fan speed, so that the vapor flow 16 increases overall in a weakened/damped manner.
- the device 2 in the third embodiment can be designed such that the vapor flow 16 flowing into the vacuum region 10 (from a predetermined fan speed) increases with increasing speed of the cooling fan 6 if the opening cross section of the opening 22 is less than or equal to the second predetermined opening cross section.
- a fourth characteristic curve 38 indicates a course of vapor flow 16 with increasing fan speed, which occurs when no counterflow is generated. With increasing fan speed from 30%, the vapor flow 16 is increased by the increasing fan speed, so that the vapor flow 16 increases overall.
- FIG. 7 shows a graph 40 which shows a relationship between a fan speed and a volume flow of the devices shown in FIGS. 2 to 5.
- a fifth characteristic curve 42 corresponds to the course of the first characteristic curve 32, in which the volume flow drops.
- a sixth characteristic curve 44 corresponds to the course of the second characteristic curve 34, in which the volume flow remains constant.
- a seventh characteristic curve 46 corresponds to the course of the third characteristic curve 36, in which the volume flow increases with damping.
- An eighth characteristic 48 corresponds to the course of the fourth characteristic curve 38, in which the volume flow increases unaffected/unbraked/undamped.
- FIG. 8 shows a schematic representation of an oven 50 or cooking appliance (which is referred to below simply as oven 50 for the sake of simplicity).
- the oven 50 has the cooking chamber 4, which is surrounded by walls of the oven 50 and into which foodstuffs for cooking can be inserted or removed via an opening which is formed in the walls and can be closed with a door.
- the baking oven 50 has the device 2 described.
- the vapor intake channel 18 of the device 2 is connected to the cooking chamber 4 in order to be able to discharge the vapor flow 16 from the cooking chamber 4 .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022200778.6A DE102022200778A1 (de) | 2022-01-25 | 2022-01-25 | Vorrichtung zum Abführen eines Wrasenstroms sowie Backofen oder Gargerät |
| PCT/EP2023/050720 WO2023143931A1 (de) | 2022-01-25 | 2023-01-13 | Vorrichtung zum abführen eines wrasenstroms sowie backofen oder gargerät |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4469728A1 true EP4469728A1 (de) | 2024-12-04 |
Family
ID=85018928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23700957.6A Pending EP4469728A1 (de) | 2022-01-25 | 2023-01-13 | Vorrichtung zum abführen eines wrasenstroms sowie backofen oder gargerät |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4469728A1 (de) |
| DE (1) | DE102022200778A1 (de) |
| WO (1) | WO2023143931A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2862095A (en) | 1954-10-07 | 1958-11-25 | Philco Corp | Vapor treating means |
| DE3516847C3 (de) | 1985-05-10 | 1995-02-23 | Miele & Cie | Elektroherd mit Katalysator |
| DE69318130T2 (de) | 1993-03-08 | 1998-08-13 | Europ Equip Menager | Elektrisches Haushaltskochgerät wie Ofen, Kochherd oder dergleichen |
| DE4324507A1 (de) | 1993-07-21 | 1995-01-26 | Bosch Siemens Hausgeraete | Backofen |
| CH711637B1 (de) | 2004-07-21 | 2017-04-13 | V Zug Ag | Gargerät mit steuerbarer Entlüftung. |
| CH709723A2 (de) | 2015-09-23 | 2015-11-13 | V Zug Ag | Gargerät mit Lüftung. |
| DE102018209581A1 (de) | 2018-06-14 | 2019-12-19 | BSH Hausgeräte GmbH | Gargerät |
-
2022
- 2022-01-25 DE DE102022200778.6A patent/DE102022200778A1/de active Pending
-
2023
- 2023-01-13 WO PCT/EP2023/050720 patent/WO2023143931A1/de not_active Ceased
- 2023-01-13 EP EP23700957.6A patent/EP4469728A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023143931A1 (de) | 2023-08-03 |
| DE102022200778A1 (de) | 2023-07-27 |
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