DE1813644B2 - TEMPERATURE LIMITER WITH DISPLAY OF A DEFECTIVE TEMPERATURE REGULATOR - Google Patents

Description

I 813 644

which is to be operated when using a self-holding relay, but to create a display device that provides an indication of a defect in the first temperature controller even during a longer period of time in which the second temperature controller is through corresponding cooling or warming of the Heizbzw. Cooling device back in its rest position has returned, which he normally takes as long as the first temperature controller works undisturbed.

In solving the problem, the invention proceeds from a temperature limiter with display for monitoring a first temperature controller that switches a heating or cooling device with a switch operated by a second temperature controller for switching the heating or cooling device at a limit temperature above or below the setpoint due to a defect in the first temperature controller. The object is achieved according to the invention in that the second temperature controller has an additional switch for the display means in a manner known per se, which is designed so that the display means timed before the heating or cooling unit is switched by the second temperature controller, but after the switching point has been reached of the defective first temperature controller, is switched on and only switched off again after the switch-on point of the second temperature controller.

Using the example of a freezer, rt, works the design-compliant device as follows:

In a freezer, the first temperature controller ensures ensure that the refrigeration unit is switched off when the temperature in the freezer is a first The temperature limit threatens to fall below. After the occurrence of a defect in the first temperature controller the temperature will slowly fall below this limit until the second temperature controller is used for the first time Switching (switching off the cooling unit) is forced. Before this switching, but after falling below the first temperature limit, d. H. the stop point of the defective first temperature controller, switching means for the display means, which are contained in the second temperature controller, are actuated. if the temperature has reached its minimum when the cooling unit Jso through the second temperature controller has been switched off, the temperature will slowly rise again. The one in the second temperature controller included switching means for the display means (for example indicator lamp) are now designed so that the switching means the display means k.irz Switch off the defective first temperature controller before the switch-on point is reached. Through this it is achieved that the display device in the event of a defect in the first temperature controller even without the Use of a self-holding relay is in use for a long time. Depending on how fast the temperature in the freezer when working the cooling unit drops and when the cooling unit comes to a standstill increases, and depending on how large the temperature difference between the switching points of the the first temperature controller on the one hand and the second temperature controller on the other hand, the duration during which the display device is in operation in the event of a failure of the Civten temperature controller, be many minutes to a few hours.

In an advantageous development of the invention, it is appropriate that the switch-off temperature of the switch for the display means is between the switch-on temperature of the second temperature controller and the underlying switch-on temperature of the first temperature controller. This case inevitably arises when the switching differences (difference in each case between switch-on and switch-off temperature) of both temperature regulators are equal to one another.

The invention can also be applied in a particularly advantageous manner to electrical storage heaters.

be turned. Such devices are charged during the low tariff period, ie within the time during which electrical energy is supplied at a reduced tariff, which is usually the case at night. After the end of the low tariff period , the power supply to the storage heater and thus the heating of the same by the heating unit contained in the storage heater is interrupted. In order to enable the display of a defect even during a part of the normal tariff period following a low tariff period in the event of a defect in the first temperature controller contained in the storage heater, it is appropriate, in accordance with an advantageous development of the subject matter of the invention, that the heating unit for the storage heater only can be switched on during the low tariff time, but that the display means is also in operation during the normal tariff time, that is to say is supplied with normal tariff electricity.

Acoustic or optical means, for example a display lamp, can be used as the display means. to serve.

The drawing shows an embodiment of a device according to the invention for an electrical Storage heater.

Fig. 1 contains the electrical circuit diagram of the device;

Fi g. 2 shows the temperature curve on the temperature sensors of the first and second temperature sensors, the two associated temperature controllers have different switching differentials: in

Fig. 3 shows the same temperature profile Temperature controllers with the same switching differentials are shown.

In Fi g. 1 is the three-phase heating unit H one-

on the one hand to the terminals Mp of a three-phase AC voltage network and on the other hand to the terminal triple MT, which is only energized during the low tariff period. The first temperature controller R Ϊ ensures that its contact r 10 when it is reached

Chen a first temperature limit opens so that the heating unit H stops heating. After the temperature occurring at the temperature sensor of the first temperature controller Rl has dropped, the contact r 10 closes again. (With the contacts rlO and r 20., Ind in each case contact triplets meant.) In the event that the temperature controller R 1 is defective, ie that the contact r10 can no longer open, the second temperature controller Rl is provided for safety reasons Contact / -20 is opened,

when rtie temperature at the temperature sensor of the second temperature controller R 2 reaches a second temperature limit. Before this temperature limit is reached, but after reaching the first temperature limit of the defective first temperature controller Rl, the contact r 21 is closed so that the display means A, an indicator lamp, shows the defect of the first temperature controller R. 1 by lighting up. The indicator lamp A is off the terminal

5 J 6

ATDC supplied from with normal rate current, that is, the temperature regulator R2 and the differential indicator is lit lamp - where the contact 21 r overall til and 111 of the contact 21 is r. In Norschlossen is - both during the low tariff period, the switching differences of the Konais are also during the normal tariff period, takter20 and r21, as also indicated in Fig. 2,

F i g. 2 shows the course at which temperature sensors 5 differ from one another.

learning the temperature controllers R1 and Rl, plotted In Fig. 3 is a similar curve of the temperature over the time T in hours (h). During the opening on the temperature sensors of the two temperature charges of the storage heater within the low-temperature controller, however, the switching differential tariff time, which started at time T = O, the contact 10 and r20 may be the same, the temperature increases - io is what has the manufacturing advantage that learning continuously, ie it follows curve 1. When two temperature regulators that are identical to one another are reached, the first limit temperature tlOaus, which can be deviated (cf. the arrows!),
switching temperature of the first temperature regulator R 1, the case of a defective thermostat R 1 follows the Tl ie at 8 hours; the first temperature-temperature / curve 1 opens its contact r 10 via the switch-off time controller Rl (provided that the 15 point Tl of the contact r 10 is also functional and thus temperature controller i? 1). As a result, with the temperature / 21 em at time T2, the temperature / falls steadily, thus follows the switch-on point of contact r21, which is the curve 2. At time T 3, the contact indicator lamp closes electrically. The AnrlO again, because at this time the reintroduction show the defect of the temperature controller R starts off temperature / 10 one of the first thermostat 20 ie at the time T 2. Then increase the tem- Rl is reached. If there is still voltage at the terminal temperature / further up to the time T5 the switch-off triplet NiT , the temperature then follows the profile temperature t IQ from the contact r20 of the second of the curve 3 until the first temperature limit, ie the temperature controller R 2 , is reached . At this time switch-off temperature / 10 off is reached. At this point the heating unit H is de-energized, so that the temperature opens the contact rlO again. The temperature /, now following the curve 4, falls, this game is repeated until the low tariff should the low tariff time at time T 7 'has ended. not finished, when the temperature is reached,

However, can the contact r10 at the time Tl be at ratur .'2Oe / ?; switch on contact r20 again and

Due to a defect in the first temperature regulator, the temperature / following the curve S 'rises again.

R1 do not open, the temperature curve is on. The difference between the temperatures / 10 off

those. The temperature / it follows now also and / 10, an the one hand and from the temperatures / 20

after time Tl of curve 1. At time T 2 and / 20 a on the other hand are equal to one another,

The contact r 21 closes when the tem- ist but the low tariff time is reached at time T 6

temperature / 21 a. has already ended, the temperature / will also be after

From now on, the indicator lamp A. The 35 follow this point in time of the curve 4 and so to the temperature / but continues to rise until the temperature point T 9 'has reached the switch-off temperature / 21 from 1 20 off at time T 5, at which that of contact r21 of the second temperature controller Λ 2 contact r 20 opens. Since the heater H can now reach. At this point in time, the display goes out, the temperature drops / from now on, where lamp A, which in turn also follows curve 4 after the end of the curve 4. When the tempe- 40 low tariff time (time T 6) has been reached, it has continued to light up. ratui / 20 a at time T7, the contact (the display time includes as also shown in FIG. 1 by a r20 again, so that the temperature / now corresponds strongly speaking curve 5 increases drawn distance on the abscissa. The Anstei- indicates.)

gen and drop in temperature / within the in- The differences between temperatures

tervalls between / 20 and / 20, a repeated .'20 45 and / 21, a one part, and the temperature

until the low tariff period has ended. With Be 120 on and the temperature ζ 21 off on the other hand

At the end of the low tariff period, the processes are the same because this occurs at a

in the same way, as described in the following, temperature controller with several, on different

assuming that the never-temperature contacts set like him

the tariff time had already ended at time T 6. After 50 temperature controller represents R 2, the easiest to achieve

The end of the low tariff period follows the temperature / chen lets. However, this is not a requirement for there;

the curve 4 (or a similar, but time-shifted functioning of a device according to the invention

surrounded) with electrical reaching the temperature / 21 from the memory at particular Heizgeräter

Time T9, the contact r 21 opens, so that the advantage results when the invention is used

indicator light A goes out. 55 that the indication of the defect of the first temperature

In the described (unfavorable) case, the regulator lights up even then, to whom

Indicator lamp A therefore at time T2 until the low point, which is usually within the night time

Time T 9. in the present case is about 7 hourly tariff time ended, so that the user of the Spei

the long. It is particularly noteworthy that the cherhdz device also nocl

Indicator lamp A can still recognize after completion (T6) 60 when the storage tank is being charged

the low tariff period lights up. The heater's time span has long since ended, and also

Leuchtcns essentially depends on how large can still be seen when the temperature ai

the difference between the switch-off temperatures is ready for the temperature sensors of the temperature controller

the first and the second temperature controller, d. H. has sunk so far that it is below the Aus

between tiOaus and / 20ows. is and how high the switching temperature of the first temperature controller is

Difference (switching difference) between the switch-off, i.e. below the temperature above which it

point / 20 from the contact r20 and the re-the defect de? first temperature controller

cinschaltpunkt makes / 20 a that contact the second only noticeable.

1 sheet of drawings

Claims (3)

directions, the work of which can not be dispensed with even if the (first) temperature controller contained therein is defective, such as, for example 1. Temperature limiter with display to monitor the case of storage heaters and freezers of a heating or cooling device S, the disadvantage that the temperature monitor with a switching first temperature controller with a malfunction of the (first) temperature controller belonging to a second temperature controller operated The device switches off completely, so that the user has to freeze the switch for switching the heating or cooling of the corresponding heating device or the device can spoil the refrigerated goods of the cooling device if the temperature is above or below the target value as a result of a deficit That is why the temperature monitor has often been replaced by a second temperature controller because of the defect in the first temperature controller. When indicated that the second tempe- a disturbance of the first temperature controller works temperature controller (R 2) in a manner known per se, the heating or cooling device now continues when its additional switch (r21) for the display means temperature now also through the second Tempeiatur - (A) , which is designed in such a way that the display controller is regulated to a different temperature level medium (A) before the heating is switched on than it is by the first temperature controller of the (H) or r.ühlaggregates the second Tem case would be. This remains hidden from the user of a relief regulator (Rl), but after reaching the appropriate heating or cooling device, however, mostly the switching point (/ 10 off) of the defective first temperature. Display means are therefore to be provided, the temperature controller (Rl) is switched on and a malfunction of the first temperature controller is only displayed after the switch-on point (/ 2OeZn) of the second so that it can be rectified. The purpose of being turned off a suitable display device is to create the temperature controller (R2). of the present invention. This is done by a 2. Temperature limiter according to claim 1, there- temperature control device of a heating or cooling arch characterized in that the switch-off temperature device assumed that a second tempeture (f21 off) of the switch (R 21) for the display contains the temperature controller, which in the event of a defect the first tempering edium (a) between the Wiedereinschalttempera- raturreglers the temperature by switching the heating Ιυτ (t 20, a / the second temperature regulator (R2) or the cooling unit of the heating or cooling apparatus uid limited the darunterlie _b forming Wiedereinschalttempe-. nlur (tlOein) of the harvest temperature controller (R 1) 30 Such a switching device is for example lies. known in the utility model 1 757 823 3. Temperature limiter according to claim 1, in which a safety precaution at TemoiJer 2, characterized in that the heating perature control circuits are shown and described, the unit (H) contains a first temperature controller contact only during the low tariff period, the (i ^r = 0 to T 6) can be switched on, but that 35 is thermally switched on by a second downstream device which is provided with display means (A) even during normal operation. tariff time (from 76) is in operation. However, this display and shutdown means is switched on and off at the same time, so that after If the temperature drops, the display means immediately 40 is turned off. Also in the German patent specification 693 882 is Heating or cooling devices, for example hot, a protection against overheating, electrical operating water storage tank, Storage heaters or deep-freeze devices shown and described in the two Devices are almost always with a (first) temperature bimetal strip lying parallel to one another on one controller, which ensures that the Tempe 45 are connected to the common circuit in which temperature of such a device a certain limit of a bimetallic sensor depending on the respective not exceeds or falls below. There is now the gene position of the other bimetal sensor, where There is a risk that if this (first) temperature is disturbed, the first bimetallic regulator will stop displaying temperature controller that has an increased temperature with this temperature controller. It therefore takes place with Allowed device or the heated or cooled good 50 the first temperature controller an indication of erdamaged or is spoiled. One has therefore in high temperature and with the second temperature heating or cooling devices, the heating device is switched off in addition to the door sensor (first) temperature controller a temperature monitor reaching an even higher temperature provided, which takes place in the event of failure of the (first) temperature. turrejjlers, d. H. So beyond the limit, this side 55 It would be conceivable that the display of a defect in the which the temperature through the (first) temperature first temperature controller at such a temperature temperature controller is to be maintained, the temperature control device is to be enabled in such a way that borders, thus holding it on this side of a second border, that during the first rule game of the second which little outside the limit temperature of the temperature controller after the occurrence of the fault (first) temperature controller. 60 of the first temperature controller is a relay for response A temperature monitor is understood to be normal, which is controlled by a self-holding sometimes a temperature-dependent switching element, switching independently after your initial response which, when its temperature limit is reached, depends on further control cycles of the second one-step shutdown of a temperature controller in the connected radiator or cooling 65 position persists. Could this self-holding relay causes aggregates, which by itself not be connected to the display means, so that a who turns on. The use of such a reliable display of this defect would be guaranteed. Temperature monitor now has the task of the invention with heating or cooling, however, the effort