FI57335B - REGULATOR FOER ELEKTRISKA KOKPLATTOR - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2310867.0 (71) E.G.0. Elektro-Geräte Blanc und Fischer, 7519 Oberderdingen,

(1) Robert Kicherer, Knittlingen, Federal Republic of Germany - Germany (7) Oy Kolster Ab (5¾) there are two operating heating advantages.

There are regulators that would act as pure dosing energy regulators, i. Conduct energy into the electric hob as individual power pulses, the length and distance of which are determined by the position of the control rod. Hämä energy regulators operate thermally, i.e. they have a control heat resistance and himetal metal, which in the heated state cuts off the energy and, when cooled down, switches it on again. Although such energy regulators can be used to adjust the power steplessly, it is very difficult to set quite low powers. For example, if the hob must also be suitable for keeping food warm, then it must also be possible to use it at a minimum power of about 50 watts. However, this is only a few percent of the 2000 watt hob and the total power. The closing and opening times should therefore be in relation to each other, which is hardly possible with normal controls. If such switching time ratios were to be achieved, a precision controller would have to be fabricated, which would not be economically feasible.

Further known is a controller for electric hotplates which is marketed under the trade name "Regla". This electric hotplate has a consumption heating resistor and a wear sensor with a temperature-dependent resistor. The energy supplied to the electric iron plate is controlled by the closed and open connections of the electronic switch, which is acted upon by the first control heating resistor through the first control heating element. The yasting sensor is connected in series with the electric hob in parallel with its first heating resistors. Furthermore, the controller has a thermally operated time delay member with an electrical switch, which at the beginning of cooking allows a greater energy to be exported to the eellings plate than corresponds to the setting of the control rod. This regulator has an expansion element of himetal, which is electrically heated by a heating resistor connected in parallel with a resistance sensor with which there are faulty mold resistors in series. Short-circuiting one of the latter resistors via a thermally operated time switch which is actuated by a hand key results in a lower resistance and thus a lower temperature being switched to the sensor circuit. the individual power pulses become magnified. The advantage of this system is that only electrical wires are needed for the electric hob, for which the corresponding connections are easy to make. Furthermore, a controller has been manufactured, the basic characteristic of which corresponds to the characteristic of the energy controller, i.e. the hob can be used in the same way as a normal hob with seven-stroke connection, only with the difference that the power control from the hob is done steplessly. The resistance sensor provides a certain temperature dependence in the upper control range, which, however, primarily acts as an overheating protection. The initial switching device can be used to provide a mode of operation reminiscent of automation, but leaving it to the hostess to decide whether he or she wishes to use this, which gives greater power in the boiling-pee heating zone. However, this controller requires relatively high control power for control-heating support Jaan (approx. 25 watts). Since the heat thus generated must be dissipated from the controller, the controller must be made relatively large.

Furthermore, our automatic regulator is known, which cooperates with a temperature sensor in the middle of the hob and transfers the expansion of the expansion fluid contained in the latter through a capillary tube to the membrane box. The membrane box is actuated by two opposed snap switches which switch the power of the two heating elements of the hob. This provides a soft and adaptable temperature control, which also allows satisfactory operation in the cooking zone, where most temperature control is difficult. However, a controller such as that described, for example, in the German Offenle-gungsshriftl 2 058 512, is somewhat more costly to manufacture than 57335 than the hob itself, because space and wiring to the sensor box are required here and not only electrical connections between the controller and the hob are required. namely, a capillary tube connecting the age or membrane box.

The object of the present invention is to provide a controller which copes with purely electrical connections between the controller and the hob and which has a wide range of energy controller properties and which has an extended control range, especially at low powers. This controller must be able to cope with low control powers and must be capable of being manufactured to a small size.

This object is solved by a controller according to the invention, which has an adjustable metering energy regulator, the switching contact of which is located in the input line of both consumption heating resistors and that the switch it is equipped with a manual time switch device which, independently of the manual switch, switches on a switchable consumption-heating resistor for a predetermined time. . In this way, a higher power is applied to the hob for a sufficient predetermined time for cooking, in order to achieve boiling, despite the fact that the controller is set to a lower, further cooking power.

It is preferred that the switchable consumption heating resistor has a substantially higher power than the second consumption heating resistor. The power of this second, less powerful consumption-heating resistor · can approximately correspond to the maximum re-cooking power, i.e. the power required in a cooking operation requiring a higher power requirement to carry out normal re-cooking. Preferably, the power of the consumption heating resistor to be switched off can be about four times the power of the second consumption heating resistor.

When the consumption-heating resistor, which is now switched off in the lower control range and preferably has a higher power than the second resistor, is switched off, the energy controller only dispenses the consumption-heating resistor with a lower power supply than the power supply. Thus, when a relatively simple energy regulator is used, which allows stepless power control of 10-100%, the minimum adjustable power of the hob is 10% of the power of this small consumption-heating resistor. If the latter is 1/5 of the total power, then 2% of the total power is of course achievable, for example 40 watts in the case of a 2000 watt hob.

According to a preferred embodiment of the invention, the electric hob may have an overtemperature protection switch which disconnects the consumption-heating resistor to be switched off. With this measure, the idle power consumption (hob connected without a cooking vessel or the cooked substance cooked to the end) can be limited to a value that is not very much higher than the power of the lower-power heating element. If this power is about 400 watts, the 2000-watt hot plate can be 700 watts when controlled by a known, hot-tempered controller with a hob-operated regulator is about 1200 watts, thus making it possible to place the hob closer to temperature-sensitive objects, for example to create a very low structural unit for installation inside kitchen furniture.

Furthermore, it is advantageously possible in the controller according to the invention to connect the control-heating resistor of the energy controller and possibly the time switch device in parallel with the consumption-heating resistor. In this way, the number of controller types can be reduced, as a special controller type only needs to be manufactured and stored for each mains voltage. On the other hand, one type of control can be used to adjust hobs of different wattages. In the known controller, on the other hand, the control heating elements must be at least partially filled in series with the hob, so that for each voltage and each power there must always be a special type of controller.

According to the invention, it is also possible, above all, to survive with low control powers, because at least one resistor can be saved. Therefore, it is possible to cope with an average control power of 9 watts. For this reason, the controller can be built smaller and there is no need to ensure good heat dissipation when placing it.

Other advantages and features of the invention will be apparent from the subclaims of the invention and from the following description taken in conjunction with the accompanying drawings. One embodiment of the invention is described in the drawings, which will be explained in more detail below.

Figure 1 shows a circuit diagram of a controller according to the invention.

Fig. 2 shows a diagram of the consumption power P as a function of the respective angular position W of the control axis of the controller.

Figure 1 schematically illustrates an electric hob 11 with two heating resistors, namely a consumption heating resistor P1 with a lower power, e.g. 400 watts, and a consumption heating resistor P2 with a higher power, e.g. 1600 watts. The power of the consumption heating resistor P1 is preferably about 1/5 of the total power of the hob. This description describes the invention in connection with an electric hob with a total power of 2000 watts. An overheating protection switch 12, for example a bimetallic switch, is connected in series with the consumption heating resistor P2, which limits the maximum permissible temperature of the electric hob by switching off the consumption heating resistor P2.

5,57335

SttMk.lttol.Y7 n is kola.ll. aibkOlUtlnnlllll 15, 14 i »15 in its entirety to the controller marked with reference number 16. The controller contains e.g. an energy regulator 17 and a time switch device 18. The energy regulator is controlled by the operating knob 19 via the regulator shaft 20 and the curve plate 21. The curved plates placed on the regulator shaft 20 are shown in perspective for clarity, in contrast to the regulator shaft and the layout knob.

In a known manner, the energy controller has a switch 22 «formed as a snap switch, which is located in the common input line 13 of the consumption-heating resistors P1 and P2, and which controls the export of current to the entire hob. The switch 22 is acted upon by a bimetallic member with a control-heating resistor 23 * The control-heating-resistance resistor is connected between the wires 13 and 14 »it is thus in parallel with the wear-heating resistors. In series with the control-ballast resistor 23 there is a diode 24 '· Curve plate 21 »which acts on the energy regulator to set this closing and opening times» has two consecutive ranges »each extending from points with a relatively small switching time (K1 and B1) to points the switching time of the energy controller is large (K2, B2).

A curved plate 24 »is placed on the control shaft 20, which acts on the switch 25 in such a way that it is open on the vessel K located between points E1 and E2 of the curved plate 21. On the other hand, the switch 25 in area B between points B1 and B2 is closed. Eytkln 25 connects the consumption-heating resistor P2 of the electric hob 11 to the connection 26 of the controller of the connection line 15, which is connected to one phase of the household electricity network. The second phase of the household electricity network is connected via a connection 27 to the switch 22 of the energy controller 17.

A curved plate 26 is further placed on the controller shaft 20, which acts on the switch 29 * The switch 29 is a closed-open switch of the controller. It is thus closed in all positions except in the opening 0. The switch 29 is located in the line coming from the connection 26.

The time switch device 18 is constructed in a manner known per se. It has a push-button 30 for switching, which can be manually controlled, and a texas switch with a control-moon-prediction resistor 31 for the bimetal 32. It further comprises two switches 33 and 34 in communication with the pushbutton and the biathall. The switch 35 is likewise parallel to the wear-heating resistors between the wires 13 and 14 and is not connected in series with the diode 24 '. Its sole purpose is to extend the switching range of the blmetal time switch. To this end, it works in conjunction with a latch device located on the push button 30, which ensures that the thermal time delay relay 31, 32 runs, for example, in three stages until the switch 34, which is closed when the push button 30 is pressed, opens again. The switch 34 is connected between the connection 26 and the connection line 15 of the consumable heat resistor P2. The function of the cam plate 35 on the adjusting shaft 20 is 6 57335 to ensure that the switch 54 is opened when the adjuster is turned to the open position O.

The following explains the modular mode of operation of Figures 1 and 2

The following modes of operation are possible, in which case only the most essential modes of operation 1) heating are mentioned here

The Sun controller is switched on (closed) by turning the operating knob 19 from position 0 (Fig. 2) to the position K1, the switch 29f as shown in Fig. 1 becomes closed, while the switch 25 and the switch 54 are open. The overheat protection switch 12 is closed. Since the bimetal of the energy regulator 17 is cold, the switch 22 of the energy regulator is also closed. The lower-power consumption-heating resistor P1 receives current, as does the control-heating resistor 25 * Thus, the bimetal becomes heated and the relative position between the bimetal and the switch 22 becomes open again after a short time of the switch 22, whereby the heating resistors P1 and P2 are turned off. The bimetal cools and the switch 22 closes again. The slat plate 21, the area K of which in this case is in operation, determines the relative fastening start, i. the relationship between the on-time and the total time (clin-on time + off-time), which determines the power. As already mentioned, the energy regulator can still be reliably set up to a relative switching range of 10 l »· Since the power of the consumption heating resistor P1 is 400 watts, it is of course possible to heat only 40 watts.

It should be mentioned here that the diode 24 'makes it possible that, despite the relatively small powers of the control heating inputs 25 and 51, a slightly stronger counterpart can be used, since the diode passes only one half of the alternating current and thus halves the voltage. This is especially important when the hob is operated at a higher voltage, such as 580 volts. At this voltage, the control-heating coil of the controllers normally causes difficulties when used at the full mains voltage.

2) cooking with automatic boiling yellowing.

When the controller was in a lower range during heating (near point K1), the controller is turned slightly higher in normal cooking, but it is still in the cooking zone K. In this case, it is set to further cooking power, which can be eg 510 watts. However, since it would take a very long time until the substance to be cooked at this relatively small power Iqrlmä is heated, the pushbutton 50 is used. In this case, the switch 54 becomes closed and the consumption-resistance resistor P2 is supplied via the line 15. Its power is now dispensed together with the consumption heat resistor P1 by the power regulator 17, so that instead of the 510 watts set per se, 1550 watts are now available. In Fig. 2, the curve τ 57335 in the cooking zone 40 gives the power acting on the consumption-heating-open support PI controlled by the inorg controller 17 alone, while the dashed line 41 depicts the combined power of the heating resistance support P1 and P2 controlled by the in-power control 17 when the time switch device 18 is connected. This is also addressed in the blocks in the lower part of Figure 2.

when the dirt switch device has run out, for example 8 uintrvfcfa is consumed, the switch 34 automatically opens again, whereby the consumption-heating resistor P2 is switched off, and the set forwarding power of 310 watts takes care of the boil.

3) Cooking without boiling-yellow automatics

It is also possible to operate without the use of a time switch 16. In this case, when placing the cold cooking medium on the plate in the usual way, the controller is first set to a high power, for example in the vicinity of point B2. In this range, the switch 23 on the curve plate 24 becomes closed and the consumption-heating resistor P2 is connected in parallel with the resistor P1. The hotplate is heated to approximately 2000 watts, because the curved plate 21 at point B2 also has a closing time of the energy regulator 17 of almost 100 i »* When prefer this el-autemsUt approach because they are otherwise in action by the stove. The controller according to the invention makes this possible without further ado.

4) Baking

Column area B is mainly needed for baking, transforming or the like. · In this area the switch 23 is closed as Je mentioned and both consumption heating resistors P1 and P2 are controlled by the inorgy controller 17 * The energy controller can be arranged on the curve plate 21 so as not to see, preferably its power is related to the region K, i.e. point B1 has a relative clinker start of 23 #, for example, so that 300 watts is affected. The area between points K2 and B1 is bypassed by the control spring cross spring (not shown) so that the control fi remains in this position.

3) Idling is an expansive mode of operation which, even at home, can substantially pre-emerge when the substance to be cooked has been completely cooked or when the hob is accidentally switched on without having to be cooked. When the maximum permissible operating temperature is exceeded, the overheating protection switch 12 trips and the consumption heating resistor P2 switches on. This kalutua-kuamming counterpart P2 cannot be used for a complete and permanent polse connection, because otherwise, for example, sharp frying in a bad pan would no longer be possible. The consumption fever is therefore occasionally switched on with the overheat protection switch 12 for a short time, under which aola 700 watts of idle power is obtained, which toela still demanded a lower fish which was not possible.

Within the scope of the invention, numerous modifications to the described embodiment are possible. Viiapt can, for example, instead of the curves shown used! also other arrangement »or coupling members, which also have an omial curve of the tolsealalae other than the substantially straight characteristic curve described in Fig. 2. It is also possible to use the diode 24 '. Excludes when the hob is operated with a lower voltage, eg 220 volts.

M.

Claims (8)

57335 9 A controller for electric hotplates with two consumption heating resistors, wherein the controller (16) is set to a metering energy controller (17) »whose switching circuit (22) is located in the input line (13) of both consumption heating resistors (P1, P2) and that manually together with the switch (25) controlled by the setpoint setting of the energy controller (17), one of the consumption heating resistors (P2) can be switched off, characterized in that it is equipped with a manual time switch device (18) which switches on for a predetermined time independently of the manual switch (25) resistance (P2). Controller according to Claim 1, characterized in that the switchable consumption heating element (P2) has a substantially higher power than the second consumption heating element (P1). Regulator according to Claim 2, characterized in that the power of the consumption-heating resistor (P1) with a lower power corresponds to the maximum required cooking power. Controller according to Claim 2 or 3, characterized in that the switch-off heating-heating resistor (P2) has a power of approximately four times the power of the lower-heating consumption heating resistor (P1). Controller according to one of Claims 1 to 1, characterized in that the electric hob (11) has an overtemperature protection switch (12) which switches off the switchable consumption heating element (P2). Controller according to Claim 1, characterized in that the time switching device (18) is a thermal time switching device known per se. Controller according to one of Claims 1 to 6, characterized in that the control heating element (23, 31) of the energy controller (17) and optionally the time switch device (31) is connected in parallel with the consumption heating resistors (P1, P2). Regulator according to Claim 7, characterized in that a diode (2V) is connected in series with the control heating resistors (23, 31).