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
  • F24C15/02—Doors specially adapted for stoves or ranges
  • F24C15/027—Doors specially adapted for stoves or ranges located at bottom side of housing
• • 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
  • F24C7/00—Stoves or ranges heated by electric energy
  • F24C7/08—Arrangement or mounting of control or safety devices

Definitions

• the present invention relates to a cooking appliance, in particular a Hocheinbau- cooking appliance, with at least one a Garraum delimiting muffle with a muffle opening, a door to close the muffle opening, controlled by a control device drive means for moving the door and a anti-trap device for detecting a Einklemmfalls.
• a high-installation cooking appliance in which a pinching of objects on the bottom door can be detected by a plurality of independently operable anti-pinch switch between the bottom door and the muffle frame.
• an increase in pressure in a door seal with a hollow profile can be evaluated.
• DE 101 64 239 A1 describes a pinch protection which is triggered by different tensile forces on the traction cables driving the bottom door.
• a torque sensor is also described which detects a load torque on the drive shaft of an electric motor.
• Tensile force sensors, piezoelectric sensors and deformation or stress / strain sensors are listed as sensors.
• DE 102 88 141 A1 also describes an optoelectronic sensor for detecting a trapping case which switches over the amount of reflected light.
• countermeasures are initiated, such as stopping and reversing the door.
• countermeasures are initiated, such as stopping and reversing the door.
• the disadvantage is that the Einklemmerkennache described do not provide measures for the time between the detection of Einklemmfalls and the following countermeasures. Also, no measures are provided that absorb a malfunction of the anti-trap. It is therefore an object of the present invention to provide an improved reliability for the Einklemmfall on a cooking appliance of the type described above.
• the present object is achieved by the cooking appliance having the features of patent claim 1 and a method according to claim 17.
• the cooking appliance which is in particular a high-installation cooking appliance, but can also be a cooking appliance with a baking tray, equipped so that after detecting a Einklemmfalls by the anti-trap device, the control circuit controls the Antriebssein direction so that a applied to the door Force does not exceed a certain force time profile.
• the anti-pinch device is preferably not implemented as a separate subassembly but is functionally integrated into the control circuit or its module (s), which typically already has a microcontroller.
• a first force time profile is provided for a trapping case in the closing direction of the door, ie in a high-mounted cooking appliance in the process upward.
• An object is then typically clamped between the bottom door and muffle frame or housing.
• a second force time profile can be provided for a trapping case in the opening direction of the door, if in a high-mounted cooking appliance an object is typically clamped between the base door and the worktop.
• the third section may continue after a certain time be lowered to 0 N.
• the third section can also be lowered further to 0 N after a certain time. It is for quick and low-error response to a trapping advantageous if the Einklemmfall is recognizable by monitoring a traversing speed of the door, z. For example, by percentage or absolute deviation from a speed setpoint or by a high positive or negative acceleration.
• the movement of the door is generally speed-dependent, and thus independent of a payload or frictional conditions, adjustable. It is also advantageous to control a setpoint speed by means of speed ramps.
• the traversing direction of the door is reversed in case of pinching, in particular if a pinch protection is activated only when a target speed of the door is reached.
• the force time profile can advantageously only be activated when a setpoint speed of the door has been reached.
• At least one limit switch is present, which is arranged in the region between muffle opening and door, wherein an actuation of the at least one limit switch disables the anti-jamming protection device. Then, advantageously, the at least one limit switch within an opening dimension of 4 mm between muffle frame and bottom door operable. Also, when the at least one limit switch is actuated, the door is advantageously displaceable onto the muffle opening with a defined force.
• the invention is particularly suitable for high-installation cooking appliances, in which the muffle opening is a bottom-side muffle opening, and the door is a bottom door, which preferably moves linearly.
• FIG. 1 is a perspective view of a mounted on a wall Hoch- built-in appliance with lowered bottom door.
• 2 is a perspective view of the high-Einhaugar réelles with closed bottom door.
• 3 is a perspective view of a housing of the Hoch-Einbaugarologies without the bottom door.
• FIG. 4 shows a schematic side view in a sectional view along the line I-I from FIG. 1 of the wall-mounted high-mounted cooking appliance with lowered bottom door;
• FIG. 5 shows a front view of another embodiment of a high-installation cooking appliance
• FIGS. 12 and 13 force time profile curves for a floor door.
• FIG. 1 shows a high-installation cooking appliance with a housing 1 is shown.
• the back of the housing 1 is mounted on a wall 2 in the manner of a hanging cabinet.
• a cooking chamber 3 is defined, which can be controlled via a front side in the housing 1 introduced viewing window 4.
• FIG. 4 it can be seen that the cooking space 3 is delimited by a muffle 5, which is provided with a heat-insulating sheath, not shown, and that the muffle 5 has a bottom-side muffle opening 6.
• the muffle opening 6 is closable with a bottom door 7.
• the bottom door 7 is shown lowered, being with its underside in contact with a worktop 8 a kitchen device. In order to close the cooking chamber 3, the bottom door 7 is in the position shown in FIG.
• the drive device 9, 10 has a drive motor 9 shown in dashed lines in FIGS. 1, 2 and 4, which is arranged between the muffle 5 and an outer wall of the housing 1.
• the drive motor 9 is arranged in the region of the rear side of the housing 1 and is, as shown in FIGS. 1 or 4, in operative connection with a pair of lifting elements 10, which are connected to the bottom door 7.
• each lifting element 10 is configured as an L-shaped carrier whose vertical leg extends from the drive motor 9 on the housing side.
• the drive motor 9 can be actuated by means of a control panel 12 and a control circuit 13, which is arranged according to FIGS. 1 and 2 at the front of the bottom door 7.
• the control circuit 13 is located behind the control panel 12 within the bottom door 7.
• the control circuit 13, which here is composed of several spatially and functionally separated and communicating via a communication bus circuit boards, provides a central control unit for the device operation is and controls and / or regulates z.
• a heating a method of the bottom door 3, a conversion of user input, a lighting, a pinch protection, a clocking of the radiator 16, 17, 18, 22 and much more.
• FIG. 1 shows that an upper side of the bottom door 7 has a hob 15. Almost the entire surface of the hob 15 is occupied by radiators 16, 17, 18, which are indicated in phantom in Fig. 1.
• the radiator 16, 17 two spaced apart, different sized cooking place radiator, while the radiator 18 is provided between the two cooking area heaters 16,17 surface heating element, which almost encloses the cooking area heaters 16, 17.
• the hotplate heaters 16, 17 define for the user associated cooking zones or hobs; the hotplate heaters 16, 17 together with the surface heating element 18 define a lower heat zone.
• the zones may be indicated by a suitable decoration on the surface.
• the radiators 16, 17, 18 are each controlled via the control circuit 13.
• the radiators 16, 17, 18 are designed as radiant heaters, which are covered by a glass ceramic plate 19.
• the glass ceramic plate 19 has approximately the dimensions of the top of the bottom door 7.
• the glass ceramic plate 19 is further equipped with mounting holes (not shown) through the base for holding support members 20 for Garguta 21 protrude, as shown in Fig. 4.
• mounting holes not shown
• a glass ceramic plate 19 other - preferably quick-responding - covers can be used, for. B. a thin sheet.
• the high-installation cooking appliance can be switched to a cooking or a bottom heat mode, which will be explained below.
• the cooking surface heaters 16, 17 can be controlled individually by means of control elements 11, which are provided in the control panel 12, via the control circuit 13, while the surface heating element 18 remains out of operation.
• the hotplate mode is executable with the bottom door 7 lowered, as shown in FIG. But it can also be operated with closed cooking chamber 3 with raised floor door 7 in an energy saving function. In the lower heat mode, not only the hotplate heaters 16, 17 but also the surface heating element 18 are activated by the control device 13.
• the cooking surface 15 providing the bottom heat has a uniform distribution of the heat output over the surface of the hob 15, although the heating elements 16, 17, 18 have different nominal powers.
• the radiators 16, 17, 18 are not switched by the control circuit 13 to a continuous operation, but the power supply to the radiators 16, 17, 18 is clocked.
• the different sized nominal heating powers of the radiator 16, 17, 18 are individually reduced so that the radiators 16, 17, 18 provide a uniform over the surface of the hob 15 distribution of the heat output.
• Fig. 4 shows schematically the position of a fan 23, z. B. for generating circulating air in a hot air operation or for supplying fresh air.
• a mounted on an upper side of the muffle 5 Oberhitzemosmaschine 22 is provided, the single-circuit or Geographic Vietnameseig, z. B. with an inner and an outer circle, can be executed.
• another radiator such as a ring heater between the rear wall of the housing 1 and the muffle be present.
• the various operating modes such as, for example, top heat, hot air or Schnellauffilter compassion, by an appropriate activation and adjustment of the heating power of the radiator 16, 17, 18, 22, possibly with activation of the fan 23, are set.
• the adjustment of the heating power can be done by appropriate timing.
• the hob 15 can also be designed differently, for. B. with or without roasting zone, as a pure - one or Moika - warming zone without cooktops and so on.
• the housing 1 has a seal 24 towards the bottom door 7.
• the control panel 12 is arranged mainly at the front of the bottom door 7. There are alternatively other arrangements conceivable, for. B. at the front of the housing 1, divided into different subfields and / or partially on side surfaces of the cooking appliance. Further designs are possible.
• the controls 11 are not limited in their design and can, for. B. z. Eg operating gags, toggle switches, pushbuttons and membrane keys, the display elements 14 comprise, for. B. LED, LCD and / or touchscreen displays.
• Fig. 5 is schematically and not to scale a high-mounted cooking appliance shown from the front, in which the bottom door 7 is open on contact with the worktop 8. The closed state is shown in dashed lines.
• each traversing panel 25 comprises two pushbuttons, namely an upper CLOSE button 25a for a bottom door 7 traveling upwards in the closing direction and a lower OPEN button 25b for one Without automatic operation (see below) moves the bottom door 7 only by continuous simultaneous pressing the CLOSE buttons 25a both traversing panels 25 upwards, if possible borrowed; also moves the bottom door 7 only by continuous simultaneous pressing of the UP buttons 25b both traversing panels 25 down, if possible (manual operation). Since in manual operation an increased operator attention of the user is given and also both hands are used here, an anti-trap is then optional.
• shifting panels 26 are mounted on opposite outer sides of the housing 1 with corresponding ZU buttons 26a and UP buttons 26b, as shown in dotted lines.
• the control circuit 13 comprises a memory unit 27 for storing at least one destination or travel position PO, P1, P2, PZ of the bottom door 7, preferably with volatile memory modules, eg. B. DRAMs. If a target position PO, P1, P2, PZ is stored, the bottom door can move independently after pressing one of the keys 25a, 25b or 26a, 26b of the traversing panels 25 and 26 in the set direction until the next target position is reached or one of the buttons 25a, 25b or 26a, 26b is pressed again (automatic mode).
• the lowest target position PZ corresponds to the maximum opening
• the (zero) position PO corresponds to the closed state
• P1 and P2 are freely adjustable intermediate positions.
• Automatic mode and manual operation are not mutually exclusive: by permanently actuating the positioning panel (s) 25, 26, the bottom door 7 also moves in manual mode if a target position could be approached in this direction. It can be z. B. a maximum actuation time of the traversing fields 25 and 26, respectively, of the associated keys 25a, 25b and 26a, 26b, are set to activate the automatic mode, z. B. 0.4 seconds.
• a target position PO, P1, P2, PZ may be any position of the bottom door 7 between and including the zero position PO and the maximum open position PZ. However, the maximum stored opening position PZ need not be the position with abutment on the work surface 8. Storing the target position PO, P1, P2, PZ can be achieved with the bottom door 7 at the desired target position PO, P1, P2, PZ, by means of, for example, several seconds (eg two seconds), pressing a confirmation key 28 in FIG Control panel 12 are performed. Existing optical and / or acoustic signal transmitters which output corresponding signals after storing a target position are not shown for the sake of clarity. A start-up of the desired target position PO, P1, P2, PZ to be set is done, for example, by - in this embodiment - ambidextrous operation of the movement panels 25 and 26 and manual method to this position.
• a plurality of target positions PO, P1, P2, PZ can be ein arrivedbar.
• the high-installation cooking appliance can be easily adapted to the desired operating height of multiple users.
• the target position (s) are advantageously erasable and / or overwritten. In one embodiment, for example, only one target position can be stored in the opened state, while the zero position PO is automatically detected and can be automatically approached. Alternatively, the zero position PO must be stored in order to be automatically approachable.
• the or a target position P1, P2, PZ opens the bottom door 7 at least about 400 mm to about 540 mm (ie P1-P0, P2-P0, PZ-PO ⁇ 40cm to 54 cm). In this opening dimension the food supports 21 are easy to insert into the support members 20. It is advantageous if the viewing window 4 is mounted approximately at eye level of the user or slightly below, z. B. by means of a template that indicates the dimensions of the cooking appliance.
• the drive motor 9 from FIG. 1 has at least one sensor unit 31, 32 arranged on a motor shaft 30, possibly in front of or behind a transmission, in order to measure a travel path or a position and / or a speed of the bottom door 7.
• the sensor unit may include one or more induction, reverberation, opto, SAW sensors, and so forth.
• two Hall (part) elements 31 offset by 180 ° - ie opposite - attached to the motor shaft 30, and a Hallmeßaufillon 32 is fixedly mounted at this area of the motor shaft spaced. If a Hall element 31 then moves past the measuring transducer 32 when the motor shaft 30 rotates, a measuring or sensor signal is generated which is, to a good approximation, digital.
• the distance measurement is automatically readjusted by initialization in the NuII- position PO of the bottom door 7 at each startup, so z.
• the drive motor 9 is operated by actuation of both traversing panels 25 and 26, even when the main switch 29 is turned off.
• control circuit 13 is flexible and not limited, so it can be several boards, z. B. include a display board, a control board and an elevator board, which are spatially separated.
• a 4 mm opening dimension can be detected by limit switches 33, which deactivate anti-pinch protection when actuated.
• the high-installation cooking appliance can also be designed without a storage unit 27, in which case no automatic operation is possible. This can be for increased operator safety, eg. B. as protection against pinching, be useful.
• the curve is traversed in the direction of the arrow, ie from right to left.
• the downward arrows present above the curve indicate actuations of the control panel 12.
• the movement of the bottom door 7 downwards begins with two-handed operation of the movement panels 25, 26 and the ON-switch 25b and 26b, as indicated by the upper left vertical arrow.
• the ramp R1 is linear here.
• the drive motor 9 is therefore not simply turned on.
• the movement is characterized load independent, in particular independent of the payload of the bottom door 7 or changed friction conditions of the mechanics.
• An input for this can be the speed of the drive motor 9, the z. B. can be measured by Hall sensors.
• the approach to the bottom plate can be detected by limit switch 33 and / or by monitoring the travel.
• the cooking chamber 3 is not opened, the bottom door 7 so do not proceed from the zero position PO when an opening assurance is active, so if, for example, a certain temperature in the oven, z. B. 425 0 C or 600 0 F, is exceeded or a child safety device is activated.
• the bottom door 7 begins to move automatically to the position P1. Again, the bottom door 7 is gently approached (right ramp) and automatically braked (left ramp).
• the movement of the bottom door 7 upward begins with two-handed operation of the to-switch 25a and 26a, as indicated by the upper left vertical arrow.
• the control circuit 13 detects an approach to the zero position PO and brakes the bottom door 7 in good time before. But instead of using the linear ramp to shift directly down to the zero position P0, the speed-dependent control is switched to control with a defined voltage 4 mm before the zero position P0, ie by supplying the motor 9 with a corresponding voltage. This allows a maximum force development when blocking the drive motor 9 set. This voltage differs depending on the history of the process (payload, friction conditions, etc.).
• the detection of the 4 mm opening dimension is done via the travel measurement or additionally or alternatively via the limit switches 33. In the range of PO to PO + 4 mm, it is also possible to dispense with an anti-pinch protection. If, as in Fig. 6, one or both of the travel switches 25b, 26b is released, as indicated by the upper right vertical arrow, the bottom door 7 abruptly stops without ramp, as indicated by the dotted arrow.
• vL 50 mm / s
• the monitoring of the lift speed happens here, for example, by evaluating the sensor signals of the motor shaft, wherein z. B. the time between the measurement signals or pulses is evaluated. Only in the second instance is the motor current monitored, which is a rather slower method.
• the force that can be generated by the motor 9 for the method is limited in order to avoid accidents due to excessive clamping (see also FIGS.
• the deviation from the desired speed is detected by the control circuit 13, z. B. by a speed deviation or a temporal change in speed. Then reverses the bottom door, so that the object can be removed; if necessary, a, z. B. acoustic, warning signal issued.
• the bottom door 7 then moves on only when a corresponding actuation of a movement load field 25, 26 again.
• the anti-trap protection can be activated only when the bottom door 7 has reached its target speed (previously a traversing button 25a, 25b, 26a, 26b released, the bottom door 7 stops immediately), and secondly, several sensor signals are evaluated, for example averaged.
• FIG. 11 shows the trapping case (upper vertical arrow) during the opening process of the base door 7 in automatic mode to a target position P1, in which an object is clamped between the underside of the base door 7 and the worktop 8.
• the Einklemmerkennung can be done via two redundant limit switches, which recognize a - especially non-uniform - relief of the bottom door 7, whereupon the drive motor 9 reverses.
• the maximum permissible force time profile (see FIGS. 12 and 13) is not exceeded in this case.
• FIG. 12 shows a force F in N which can be applied maximally to the bottom door 7 in the trapping case during the process in a closing direction (ie upwards) against the elapsed time t in s as a first force time profile FT1.
• the possible closing force is limited to 100 N, corresponding to approx. 10 kg, for 5 s.
• This is z. B. useful if the motor 9 is up-regulated by the controller 13 to hold the target speed. This ensures in particular that body parts are not injured. If the floor door is tightened for a maximum of 100 N for 5 s, the maximum force that can be applied is reduced further to 25 N, eg. For 5 seconds. In the following, this level of force can be kept or z. B. continue to be lowered to 0 N.
• the maximum force threshold of 100 N can also apply to other traversing situations.
• FIG. 13 shows a force F in N which can be applied to the bottom door 7 in the event of trapping in the process in an opening direction (that is, downwards) against the elapsed time t in s as a second force time profile FT2.
• the time intervals and force threshold values of the force time profiles FT1, FT2 can be adapted to the structure and further boundary conditions.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electric Stoves And Ranges (AREA)
• Electric Ovens (AREA)
• Power-Operated Mechanisms For Wings (AREA)

Priority Applications (4)

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ID=37101634

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Citations (3)

Family Cites Families (7)

• 2005
  • 2005-08-17 DE DE102005038897A patent/DE102005038897A1/de not_active Withdrawn
• 2006
  • 2006-07-26 ES ES06778001.5T patent/ES2686073T3/es active Active
  • 2006-07-26 US US11/990,410 patent/US20090120424A1/en not_active Abandoned
  • 2006-07-26 EP EP06778001.5A patent/EP1917480B1/de active Active
  • 2006-07-26 WO PCT/EP2006/064704 patent/WO2007020167A1/de active Application Filing
  • 2006-07-26 PL PL06778001T patent/PL1917480T3/pl unknown

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