SE456962B - CLUTCH DEVICE FOR HEATING ELEMENT IN A COOKING HOB - Google Patents

Description

15 20 25 30 456 962 2 the criteria according to choice can be made via rotary switch or toggle switch, e.g. touch-sensitive switches.

The indication takes place in a corresponding manner either through the current setting position of the input switch, through mechanical indicating means or through electronically controllable electronic display devices.

A coupling device of the type mentioned in the introduction, which meets these requirements, has according to the invention obtained the features stated in claim 1.

A device designed according to these features according to the invention offers significant advantages for coke hobs both in terms of manufacturing technology and service technology. On the control panel for the control hob, in addition to the input and display elements belonging to the individual cooking areas, only an additional switch-on / switch-off element with a corresponding indication needs to be arranged. From a switching point of view, it is also only necessary to realize switching functions. Additional measures for heating power control during the combination operation of otherwise individually controllable heating surfaces are thus not required. This also entails service technical advantages. Namely, separate successive separate cooking areas are operated together for the combination operation. For the operator, it is then obvious to operate the control means for the individual heating current control, which primarily belongs to the front, ie the operator's separate cooking point. For switching on the combination mode, only a single input means is initially affected and the fact that this combination mode is switched on is signaled either by the setting of this input means or preferably by a light indication or an indication display. The measure according to the invention also ensures that the action of the second heating power control device on the heating elements belonging to the individual area belonging to the individual area is safely broken. An incorrect service is thus excluded.

A coupling device for controlling the cooking areas in coke hobs, in which an auxiliary heating area is arranged at least between two separate cooking areas, is characterized in according to a further development of the invention in that the coupling elements in one of their coupling positions are also connected to this auxiliary heating area: one heating power control device. Thus, a substantially continuous heating area is supplied through the heating power control device that still exists in the same way with the heating energy desired according to the choice.

It is known and customary to arrange separate cooking areas for cooking hobs with different sizes, ie. with different diameters, and it may be appropriate to generally use similar heating elements, which are adapted to the size of the smaller cooking area, and to assign an additional heating element, for example in an annular shape, to this individual heating element for larger heating areas. However, it would be unfavorable to summarize differently large, individually controllable heating areas for the individual operation, since different heating effects thereby act on the fried goods in different island areas.

In order to eliminate this shortcoming, the coupling device according to the invention is advantageously convertible so that at at least one separate cooking area with a central zone heating element and a further common to it from a heating effect control device controllable attachment zone heating element of the coupling element for the common assignment of both the separate cooking areas to a heating power control device, the additional zone heating element is separate from the heating power supply. In this context, it is also ensured that this additional zone heating element can also not be controlled by the heating power control device used in separate operation with the central zone heating element, while the central zone heating element is switched for the combination heating operation.

According to a preferred embodiment, the coupling device according to the invention is further characterized in that individually connected coupling contacts arranged in series with the heating elements, which are associated with sensors arranged in the area for the specific individual cooking areas for temperature limitation. common connection of the heating elements of the individual cooking areas at one of the heating power control devices are connected in series with the always assigned heating elements. Thus, by this preferred design, no further effort is required for the overheating protection within the scope of the measures according to the invention; the temperature sensors and switches are used in the same way unchanged for their function and for their mode of operation both in the individual control and operating mode of the separate cocoon areas and in the combination operation.

In cooking areas with heating elements without a separate temperature limiting device - such a device is often missing in the intermediate heating elements - when coupling to one of the heating power control devices, the coupling means for temperature limitation leading to this second heating element is switched on.

Within the framework of the use of electronic switching measures for controlling the heating elements in coke hobs, the switching device according to the invention is characterized in that a power switching device is connected in front of each individual heating element, that for each separate cooking area a switching / power input element is provided. of a plurality of heating elements an input element and that between the input elements and the power switches an electronic, logic interconnection circuit is functionally connected in such a way that when the input element is affected for the combined control of the plurality of heating elements the power coupling devices for the combined heating element. to a switch-on / power control input element, and that the additional switch-on / power input elements are set.of function for the separate control none of these heating elements. This measure has a very positive effect in that the current power amplifier, which controls the heating power of the individual heating elements of the cooking areas during individual operation, is also used indefinitely in combination operation and that an additional heating power switch which would not be required. had to link the total heating effect in this case. In this case, it is also not necessary to design one of the existing heating power switches so complicated that the power increased during the combined heating operation would be switchable through it. The electronic switching measures are limited to simple digital switches.

In this context, it is advantageous to design the coupling device according to the invention in such a way that the logic interconnection circuit is formed by a microprocessor coupling, that the coupling-in input elements for the separate cooking areas are connected jointly via a multiplex coupling and through-coupling through the microprocessor coupling. - the element for the combined control of a plurality of heating elements is connected to inputs of the microprocessor coupling and that the power switch devices via coupling amplifiers are connected to each of the parallel outputs of the microprocessor coupling. In a variant of this measure, the coupling device according to the invention is characterized in that mechanical switches are arranged as connection / power control input elements in connection with voltage divider connections formed by ohmic resistors, which are connected to the analog input of the microprocessor coupling. . Thus, rotary switches can be used, the operation of which corresponds to the operation of ordinary heating input controllers.

According to another variant, the coupling device according to the invention is characterized in that a pair of touch-sensitive coupling elements are arranged as coupling elements to the same coupling elements, a coupling element being the same for a coupling element. parallel to the switching elements for the digital inputs belonging to opposite functions.with the microprocessor switching. During the use of electrical digital coupling measures for controlling processes, this measure is particularly advantageous, since touch-sensitive coupling elements for inputting such control processes are more cost-effective and, in addition, more maintenance-free and maintenance-free 10 15 20 ZS 30 35 40 456 962. 6 friendly.

In this context, it is advantageous that indicating display devices are connected to the parallel outputs of the microprocessor coupling and between the outputs of the microprocessor coupling on one side and the indicating display devices and to the coupling amplifiers controlling the coupling amplifiers for each, a micro-bearing is connected processor coupling controllable gate coupling.

In view of a reliable mode of operation, it is advantageous that a flashing sensor for controlling the display indicating device, which is assigned to the switching-on power control device separated from the associated heating area during the combined heating time, is connected to a memory stage, which is set at the flashing sensor is reset at the "OFF" position of the disconnection control device disconnected during the combined heating operation before or after the end of the combined heating process by the corresponding switching input.

Within the framework of the use of coupling measures with mechanical contact switches for controlling the heating elements in coke hobs, the coupling device according to the invention is characterized in that in series with the heating element which is to be separated from a separate heating power control device and the control device can be connected of an additional heating element, between the individual current supply paths of the two heating elements are connected jointly switching switching elements. Preferably, this embodiment is in a device in which one of two heating zones of a cooking place is to be connected to the heating power control device of the further cooking place, characterized in that one of the two switching elements is connected in series with the two zone heating elements and that it the other of the two switching elements is only connected in series with the zone heating element to be connected, and together with this is connected in parallel with the second zone heating element and that the switching elements partly belong in terms of connection to the power supply line pair of the individual power supply the heating element to be switched, and partly to the power supply line pair 10 15 20 30 35 40 7 456 962 of the power supply path, belong to the second heating element, in such a way that at least some power supply lines of the power supply pair with a common phase potential 1 through the commonly switchable switching elements can be switched according to choice together with the power supply lines with other phase potentials.

For coupling contact technical reasons, it may be appropriate for the switching elements to be formed by a combination of a connecting element and a disconnecting element.

In the event of an auxiliary heating element arranged between the individual cooking areas, the coupling device according to the invention is equipped in such a way that the auxiliary heating element arranged between the individual cooking areas is connected in parallel with a further connecting element which can be connected in series with the connecting elements of the other. connectable heating element of the individual cooking area, with the heating element of the first individual cooking area.

The invention is described in more detail below in the form of preferred embodiments with reference to the accompanying drawing.

Figs. 1-4 schematically show possible operating situations when using two individual cooking areas and an intermediate cooking area in a cooker hob.

Fig. 5 shows an overview view of a control device when carrying a microprocessor.

Pig. 6 shows a subarea of this coupling device at the area of the input means.

Pig. 7 shows a subarea of the coupling device according to FIG. 5 with touch-sensitive input means.

Fig. 8 shows a relay device, via which the heating power current is supplied to the individual heating elements.

Fig. 9 shows a switching device with mechanical contact switches for heating energy control in the idle state.

Fig. 10 shows the view according to Fig. 9 in the operating condition of the first cooking area according to Fig. 2. In Fig. 11 the view according to Fig. 9 shows the operating condition of the second cooking place according to Fig. 3.

Pig. Fig. 12 shows the view according to Fig. 9 in an operating condition, wherein the first cooking area and the second cooking area as well as an intermediate heating area according to Fig. 4 are jointly usable. A 10 15 20 25 30 35 40 456 962 The schematic representations according to Figures 1-4 show a first individual cooking area Ha, a second individual cooking area Hb with H'b arranged in two zones, which is technically separate and two - cooking area Hz. With the aid of the switching device according to the invention, it must be possible to control one of the two heating areas Ha or Hb and H'b individually alone or also individually jointly. The dashed surface of the heating area Ha in Figure 2 symbolizes this mode of operation, while the dashed surface in Figure 3 characterizes the operation of the heating area formed by a circular inner heating area Hb and an outer annular heating area H'b arranged thereon. Both heating areas are affected by a common control device and are always in operation in common heating mode.

Figure 4 symbolizes the combination heating operation f In this case, the heating area Ha, the internal heating area Hb and the intermediate heating area Hz existing between these heating areas are in operation. The heating area Hb annularly surrounding the heating area H'b is disconnected.

This results in an elongated substantially homogeneous heating area for elongated or oval cookware or frying pans.

Normally, four individual cooking areas are arranged in a hob, of which areas two individual cooking areas are interconnectable with an intermediate area for a combination operation. In the hob, however, two pairs of individual cooking areas can also be formed with or without intermediate cooking areas or other arbitrary configurations. The following figures 5-8 describe switching measures for controlling four individual cooking areas and an intermediate heating area.

The core piece in this switching device is a microprocessor uP, to which on the input side the switching means of the input elements and on the output side the drift indicating elements and the relays K1-K4 are connected for switching through the heating currents for the individual heating areas. According to Figure 6, four input switches are arranged for the four individual heating areas in the hob, the switching contacts S1, S2, S3, S4 switching on to resistor stages P1, P2, P3, P4 during rotational adjustment. These resistance steps act in connection with the coupling element as permanent voltage parts, to which, depending on the position of these coupling elements, different voltage potentials are applied. The outputs of these switching devices are supplied with a multiplex stage MP.

To the outputs A0, A1, A2, A3, the multiplex stage MP is controlled, so that the input values of the input switches are interrogated in cyclic sequence and are successively sent to the analog inputs E0 and E1 of the microprocessor uP. In the microprocessor, the entered values are converted individually for the individual heating areas to power control values.

In the input switching device according to Figure 7, capacitive touch switches are illustrated as touch-sensitive input means for power control, of which switches always two adjacent units KPS1-KPS2 belong to one of the four individual cooking areas. In accordance with the multiplex stage according to Figure 6, the capacitive input switches are controlled through the microprocessor uP outputs A0-A3 and, after touching one of the input fields at the time of interrogation, a value is emitted via one of the inputs EZ or E3, corresponding to an increase and a reduction of the setting value.

The outputs A0-A3, which belong to the individual input means of the four cooking areas on the cooker hob, are also assigned to the corresponding 7-segment fields of an indication display AD. Each of these wires controls one of these fields in the display. As numeric indication fields, these exhibit seven segments and one decimal. The selection of these seven segments and the decimal point takes place via the parallel outputs PAO-PA7.

The outputs of a locking stage are also connected to the outputs PAO-PA7. Through a further output A7 of the microprocessor, this locking stage LS takes over the signal lying on the outputs PAO-PA7 and makes it available on the output side for controlling the relay stage K1-K7. By corresponding timing of these signals generated from the microprocessor uP, a clock ratio is generated for the corresponding relays, which corresponds to the current power to be provided, for the individual heating ranges.

Figure 8 shows such a relay stage. This relay stage consists of eight individual relays, of which two relays K1 and K2 connect the phase lines L1, L2, L3 and the neutral conductor N. The other relays KS-K8 are associated with the heating arranged in the hob. 15 20 30 30 35 40 456 962 10 elements R1-R6. As already described at the outset, four individual cooking areas are arranged in the present hob. Of these, two cooking areas always contain a heating element R1 and R2. In addition, a heating area device is provided in the hob, as shown in Figures 1-4.

It follows that four additional individual heating elements R3-R6 must be arranged. The heating resistor R3 is connected to the heating surface Hb, the heating resistor R4 is arranged to the heating surface.

By means of the input elements described with the aid of Figures 6 and 7, the microprocessor control u is optionally actuated in such a way that in individual cooking operation the associated relays K3, K4, K5, K7, K8 are actuated by control pulses, so that through the constantly set pulse the pause ratio the desired heating effect is generated by the heating resistors R1, R2, R3, R6 in the individual cooking areas. In the individual cooking operation, the two relays K7 and K8 are always controlled jointly, since they are together assigned a cooking area.

In order to enable the operating method symbolized according to Figure 4, in which the individual heating area Ha, the individual partial heating area Hb and the intermediate heating area Hz are to be used jointly, it is necessary to enter a corresponding input criterion. For this purpose, an input button SK and according to Figure 7 an input field KPK are arranged on the control panel according to Fig. 6. The state that the combination heating is switched on is signaled either by the switch position or by a special indicator element, for example an LED indicator.

If the input means is affected for the combination operation How is the input means made for the individual cooking area Operate via the microprocessor control for the common control of the relay KS, K6, K8 so that the associated heating elements R3, R4, RS are jointly affected with heating current in the same pulse -pause ratio according to value set via the input device. Relay K7 remains unaffected during this operating mode. In addition, it is ensured that an influence of the input means belonging to the individual heating area Hb and H'b does not have any effect on the associated heating area. However, such an effect is signaled by an indication until both the combination heating operation and the influence of this input means have been eliminated. The combination heating operation is terminated by resetting the setting of the corresponding input means for the heating power control. For a repeated combination heating operation, the corresponding selection means must therefore always be affected again.

The coupling according to Figure 9 comprises switching-on and switch-off elements, heating power control elements, temperature limiting elements and the heating elements R, which are assigned to the heating areas H according to Figure 1. The reference numeral component a denotes elements for the first heating area, below it that the reference numeral component b characterizes the elements of the second individual cooking area. Mechanical switches u1-uS can only be switched jointly and serve to switch the operation with a single cooking area to combination operation.

Figure 10 shows the switching position required for operation of the individual cooking area Ha. For this purpose, the two switching contacts a1 and a2, which are to be connected jointly, are closed and the energy regulator a3 is connected. Since the switch chain u is in the rest position and the switching contact u1 is thus opened, only the heating element Ra is affected with current for heating energy generation. In the event of overheating, a temperature sensing device Ta comes into operation and opens the associated switching contact, so that the current path to the heating element Ra is broken in the event of overheating. Figure 11 illustrates the switching position for the operation of the second individual cooking area. In this case, the switching contacts b1 and b2 are closed and the energy regulator b3 is connected. The switching contacts u2 and u5 are closed in the idle position for the operation selection switch, so that both the heating element Rb and the heating element R'b are actuated with a regulated heating current. Against an overheating, a temperature sensing device Tb is arranged, through which the associated switching contact is opened when a maximum temperature value is exceeded, so that the supply current for the heating elements Rb and R'b is interrupted.

If an elongate heating range, as shown in Fig. 4, is provided, the switching contact combination u must be actuated so that the switching contacts u1, u3, u4 are closed and the switching contacts u2, u5 open. Now the heating elements Rb and Rz are connected in parallel with the heating element Ra and together with this they can be actuated via regulated switching contacts a1 and a2 and the energy regulator a3 with regulated heating current.

Since the switching contacts u2 and u5 are opened at the switching position of the switching contact combination u and as a result of the line control shown, the heating element R'b is in no case controllable. Through the switching contact u2 the current path to the separate energy control device is completely broken and through the opened switching contact u5 and the corresponding line control a current flow through the heating element R'b can neither take place via the closed switching contact a2 nor via the closed switching contact b2. Due to the switching technical measure taken, in this case, at the same time closed switching contacts a2 and b2, the same phase voltage lies on the heating element R'b.

Claims (1)

I3 456 962 Eaggntgrav Coupling device for heating elements in a cooking hob, consisting of two heating elements for individual cooking areas, each with an etyr device, which contains a temperature sensing device and an energy regulator for generating variable heating effects, and individual bathing effects. The heating elements for the additional heating area are arranged, wherein one of the heating elements for the individual cooking areas has an access zone heating element which can be connected from the associated control device and which either the heating elements can be connected to the individual zones without heating or without heating. the current control device or all heating elements through one of the control devices are commonly connected and disconnected, while the other control device is inoperative, characterized in that the common connection and f the rank connection of the heating elements (Ra, Rb) for the individual cooking areas (Ha, Hb) and of the permissible heating element (Rz) for the permissible heating area (Hz) takes place through a switching combination (u) with three electrical inclination (ul, u3, uå) and two opening contacts (u2, uS), that at the joint connection of the heating elements (Ra, Rb, Rz> tilleatezone heating element (R'b) for the one individual cooking area (Hb) frank by the switching combination (u), wherein a the first electrical outlet contact (u1) of the switching combination (u) is arranged in an allowable heating element (Rz) containing, with the first heating element (Ra) parallel branch next to an undertaking fixed line, an undertaking opening contact (u2) is arranged between a parallel connection formed by the second heating element (Rb) and the tilate zone heating element (R'b) and a second fixed line, a second closing contact (u3) leads from a point between the first opening contact ( u2) and the parallel connection (Rb, R'b) to the return conductor end of the heating element (Ra) and the auxiliary heating element (Rz), a second opening contact (u5) lies in the parallel branch of the second heating element (Rb) at its return conductor end and a third closing contact (ué) connects a point between the allowable heating element (Rz) and the first closing contact (ul) with a point between the second heating element (Rb) and the second opening contact (u5), and that the control devices (a1) , a2, a3; bl, b2, b3) each has one immediately after the current faet charge and one immediately carry the recharging common to all heating elements - always from the energy regulator (a3; b3) jointly actuable switching contact (al. a2; bi, b2).