FR2744322A1 - DEVICE FOR SUPPLYING THE HEATING RESISTANCES OF THE VAULT AND THE SOLE OF AN ELECTRIC HOUSEHOLD OVEN - Google Patents

Abstract

A device for supplying the top and bottom heating resistors (4 and 5) of a cooking chamber (2) of an electric household oven (1) generally comprises a first control device (8) mounted in series. with said heating resistors (4 and 5), and a second control device (23) mounted in series with the sole heating resistor (5). According to the invention, the device comprises a third control device (35) connected in parallel to the first control device (8) occupying at least two positions, ie a first position called "open position" for which the third control device (35) prevents the supply of the top and bottom heating resistors (4 and 5), i.e. a second position called "first closed position" for which the third control device (35) activates the top heating resistors (4) and / or sole (4 and 5) for a first period T1.

Description

DEVICE FOR SUPPLYING THE HEATING RESISTORS OF

  VOUTE AND SOLE OF AN ELECTRIC HOUSEHOLD OVEN

  The invention relates to a device for supplying a vault heating resistor and a hearth heating resistor of a cooking chamber of an electric household oven which are connected in parallel to a

  power source and comprising, on the one hand, a pre-

  mier control device mounted in series with said heating resistors and, on the other hand, a second control device mounted in series with the floor heating resistance. Said first control device comprises a first switch-timer for controlling the heating resistors actuated by a first button 15 capable of taking determined positions limiting the operating time of the heating resistors and an adjustable thermostat mounted in series with the first switch-timer, controlled by a second button capable of taking determined positions limiting the temperature of the cooking chamber, and the setting temperatures of which vary between a minimum temperature and a maximum temperature. The second control device comprises a switch controlled by a first control member and occupying either an "oven operation" position for which the hearth resistance is connected to the power source, or a "grill operation" position. for which the floor resistor is disconnected from the power source. In known household electric ovens equipped with such a feed device, when a food is placed inside the enclosure. cooking to undergo a heating operation, the user, after having checked the position of the first control member, generally performs an activation of the first button to determine a duration of operation of the heating operation counts- given the nature of the food and an activation of the second button to determine the desired temperature of the cooking chamber for processing said food. The triggering of such a heating operation therefore systematically requires a double

user manipulation.

  In addition, the processing of certain foods such as

  that for example pizza or gratins, requires operations

  fast and reliable heating rations responding to

  wishes of users more and more in a hurry. As an indi-

  cative, optimal processing of a pizza should not

  stop only a heating operation lasting 10 to 15 minutes while optimal processing of a gratin should only require a heating operation lasting 20 to 30 minutes. However, the use of an adjustable thermostat does not make it possible to obtain heating operation times as short as those desired for optimal treatment of a certain type of food because the maximum setting temperature of said food

  thermostat is not high enough.

  The object of the invention is to remedy the drawbacks

  aforementioned by implementing a simple and reliable feeding device making it possible to treat in the

  best conditions for all types of food.

  According to the invention, the supply device

  includes a third control device connected in parallel to the first control device and

  taking a second control timer switch activated by a third button and occupying at least two positions, that is to say an open position for which the third control device allows free supply of the heating resistors of the roof and of the floor by the first device of an order

  closed position for which the second switch-

  minimum active command, i.e. the supply of

  vault and sole resistances during a first du-

  T1 T1 if the switch of the second control device is in the "oven operation" position, that is to say the supply of the roof resistor for the first time T1 if the switch of the second control device is in the " "grill operation" .10

  Thus, thanks to the supply device according to the invention, the user can trigger, with a single button

  control tone, a heating operation on a particular type of food, for example a pizza or a tin, ensuring a rapid and reliable result.

  According to another characteristic of the invention, the third control device further comprises a fixed thermostat mounted in series with the second timer switch and whose control temperature is higher than the maximum temperature of the thermostat

  adjustable from the first control device.

  Such a supply device therefore promotes a more powerful and faster rise in temperature of the cooking chamber and improves the operation of the

  electric household ovens for particular foods.

  The characteristics and advantages of the invention will become apparent from the description which follows,

  taken by way of nonlimiting example, with reference to the appended drawing in which: - Figure 1 schematically shows an electric household oven in vertical section and to which the supply device of the invention is applied; FIG. 2 is an electrical diagram of the device for supplying the heating resistors according to the invention. According to Figure 1, the oven 1 comprises an enclosure

  cooking 2 which opens on its front face by a door 3 articulated around a horizontal axis not shown

  located near its lower edge and which contains a heating element 4 and a heating element 5 for cooking food arranged on an intermediate shelf 6 represented by broken lines.

  According to Figure 2, the heating resistors 4 and are connected in parallel to a power source 7 such as for example the 220 volt sector and are controlled by a power supply device comprising a first control device 8 mounted in series with said heating resistors 4 and 5. A first end 9 of the vault heating resistor 4 is connected to a first junction point 10. Said first junction point 10 is connected to a first end 11 of the first control device 8. A second end 12 of the first control device 8 is connected to one of the polarized 13 of the power source 7. The first control device 8 comprises a first control timer switch 14 and an adjustable thermostat 15 mounted in series with said first control switch-timer 14. The first switch-timer 14 is actuated by a first button not shown, generally placed nt on the front face of the domestic electric oven and capable of taking determined positions limiting the operating time of the heating resistors. The adjustable thermostat 15 is controlled by a second button (not shown), also placed on the front face of the electric household oven, capable of taking determined positions limiting the temperature of the cooking chamber and whose adjustment temperatures vary between

  minimum temperature and maximum temperature.

  The end 11 of the first control device 8 is connected to a first contact 16 of the adjustable thermostat 15. A second contact 17 of the adjustable thermostat 15 and connected to a first contact 18 of the first control timer switch 14. A second contact 19 of the first control-timer switch 14 is connected to the second ex-15 end 12 of the first control device 8. The minimum temperature for adjusting the adjustable thermostat 15 has a value close to 100 ° C. and the maximum temperature for adjusting the adjustable thermostat 15 has a value close to 280 C. 20

  A second end 20 of the vault heating resistor 4 is connected to a second rod point.

  tion 30. A first end 21 of the floor heating resistor 5 is connected to a first input 2225 of a second control device 23. A second input 24 of the second control device 23 is connected to the first junction point 10 The second control device 23 thus mounted in series with the floor heating resistor 5 comprises a switch 25 controlled30 by a first control member not shown and occupying either a closed position not shown and called the "oven operation" position. for which the floor resistor 5 is capable of being supplied, that is to say an open position as shown and called the "grill operation" position for which the floor heating resistor 5 is disconnected from the source. supply 7. The first input 22 is connected to a first contact 26 of the switch 25. A second contact 27 of the switch 25 is connected to the second end moth 24

  of the second control device 23.

  A second end 28 of the heating resistance

  floor sole 5 is connected to the second junction point 30. Said second junction point 30 is connected to a

  first end 31 of a fuse 32. A second ex-

  end 33 of fuse 32 is connected to the second polarity 34 of the power source 7. Said fuse 32

  thus mounted in series downstream of the vault 4 and hearth 5 heating resistors, is intended to protect the electric household oven 1 against an excessively large increase in the temperature of the cooking chamber 2 in the event of failure, between others, adjustable thermostat 15.

  In the embodiment described, the fuse 32 plays its role of circuit breaker when the temperature of the cooking chamber 2 is substantially higher than 40020 oC.

  According to the invention, the supply device comprises a third control device 35 connected in parallel to the first control device 8 and 25 comprising a second control timer switch 36 activated by a second control button and occupying at least two positions , either an open position for which the third control device 35 leaves free the supply of the vault and floor heating resistors 4 and 5 by the first control device 8, or a closed position for which the second switch-timer activates, either the supply of the top and bottom heating resistors 4 and 5 for a first duration T1 if the switch 25 of the second control device 23 is in the "oven operation" position, or the supply of the top heating resistance 4 during the first period T1 if the switch 25 of the second device

  control 23 is in the "grill operation" position.

  The third control device 35 comprises a

  fixed thermostat 38 fitted in series with the second inter-

  breaker-timer 36 and therefore the setting temperature is higher than the maximum setting temperature of the adjustable thermostat 15. A first end 39 of the

  third control device 35 is connected to a first terminal 40 of the fixed thermostat 38.

  A second terminal 41 of the fixed thermostat 38 is re-

  linked to a first contact 42 of the second switch-mid

  nuteur 36. A second contact 43 of the second timer-switch 36 is connected to a second end 44 of the

  third control device 35. Said second end 44 of the third control device 35 is related to the polarity 13 of the power source 7. The setting temperature of the fixed thermostat (35) has a value close to 290 vs.

  As the fixed thermostat 38 is set to a trigger temperature higher than that of the adjustable thermostat 15, there is no overlapping of the temperature ranges, which allows the third

  control device 35 to short-circuit the first control device 8. Thus, as will be understood, a temperature of the cooking chamber is obtained very quickly, which makes it possible to carry out heating operations of the “snack” type.

  In a preferred embodiment, the second timer switch 36 can occupy either a third position also closed for which the second timer switch 36 activates the supply of the heating resistors of the roof and / or floor 4 and 5

  during a second duration T2 greater than the duration T1.

  The power of each of the ceiling and floor heating resistors being chosen respectively around 1100 W, the first duration T1 has a value

  their in a range between 10 and 15 minutes for the processing of food such as for example pizzas and the second duration T2 has a value in a range between 20 and 30 minutes for the processing of food such as for example gratins.

  It will be easier to understand the operation of the device for supplying the vault heating resistors and

  sole thanks to the following explanation.

  The user, after having checked the position of the second control device 23 in "operation in

  oven ", places a food, for example a pizza, on the intermediate stage 6 and closes the door 3 of the electric household oven.

  The food to be treated being a pizza, the user manipulates the second control button in a position P1 for which the second timer switch 36 triggers the supply of the top and bottom heating resistors 4 and 5 for the duration T1. Thus the temperature of the cooking chamber rises to a temperature of 280 ° C. in approximately 4 minutes with a total power of the heating resistors of 2,200 W and therefore allows optimal treatment of the food. From

  that the duration T1 of operation of the heating operation has elapsed, a warning device known per se and connected to the supply device, sends a signal of the end of the heating operation to the user.

  9 The user can thus remove from the cooking chamber

processed food.

  For a second type of food, for example a gratin, the user, after having checked the position of the second control device 23 in "operation

  grill "places the food in the cooking chamber 2 and manipulates the second control button on a position P2 for which the second timer switch 3610 triggers the supply of the vault resistor 4 for the duration T2.

  The heating operation thus triggered is the same as that described above.

  Thus, household electric ovens are becoming more user-friendly thanks to the presence of buttons

  control responding to specific heating operations for a particular type of food and thus facilitating the use of said ovens.

Claims (5)

  1. Device for supplying the heating resistors   vault and bottom sides (4 and 5) of a cooking enclosure (2) of an electric household oven (1) which are connected in parallel to a power source (7) and comprising, on the one hand , a first control device (8) mounted in series with said heating resistors (4 and 5) and comprising a first timer switch (14) for controlling the supply of heating resistors (4 and 5) actuated by a first button capable of taking determined positions limiting the operating time of the heating resistors (4 and 5) and an adjustable thermostat (15) mounted in series with the first timer switch (14), controlled by a second button capable of taking determined positions limiting the temperature of the cooking chamber (2) and the setting temperatures of which vary between a minimum temperature and a maximum temperature and, on the other hand, a second control device (23) mounted in series with the floor heating resistor (5) and comprising a switch (25) controlled by a first control member and occupying either an "oven operating" position for which the floor heating resistor (5) is connected to the source of power supply (7), that is to say a "grill operation" position for which the hearth resistance (5) is disconnected from the power source (7), characterized in that it comprises a third control device (35) connected in parallel to the first control device (8) and comprising a second control switch-timer (36) activated by a second control button and occupying at least two positions, i.e. an open position for which the third control device ( 35) allows free supply of the heating resistors of the roof and of the floor (4 and 5) by the first control device (35), that is to say a closed position for which the second timer switch (36) ac tive, either the top and bottom heating resistors (4 and 5) for a first duration T1 if the switch (25) of the second control device (23) is in the "oven operation" position, or supply of the vault heating resistance (4) for the first duration T1 if the switch (25) of the second control device (23) is in the "grill operation" position. 2. Supply device according to claim 1, characterized in that the third control device (35) further comprises a fixed thermostat (38) mounted in series with the second timer switch (36), and the setting temperature has a   value greater than the maximum temperature of the setting of the first control device (35).   3. Feeding device according to claim 1 or 2, characterized in that the second timer switch (36) can occupy a third position also closed for which the second timer switch (36) activates the supply of resistors top and / or bottom heaters (4 and 5) for a second duration   T2 greater than the first duration T1.   4. Power supply device according to claim 3, characterized in that the power of each of the vault and sole heating resistors (4 and 5) being chosen respectively around 1100 W, the first 12 duration T1 has a value included in a   range between 10 and 15 minutes and the second duration T2 has a value in the range between 20 and 30 minutes.   5. Feeding device according to any one of the preceding claims,   characterized in that the minimum temperature for adjusting the adjustable thermostat (15) has a value close to 100 C, the maximum temperature for adjusting the thermostat (15) has a value close to 280 C, and   the setting temperature of the fixed thermostat (35) has a value close to 290 C.