EP0483731A2 - Sèche linge et procédé de surveillance de température d'un sèche linge - Google Patents

Sèche linge et procédé de surveillance de température d'un sèche linge Download PDF

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Publication number
EP0483731A2
EP0483731A2 EP91118361A EP91118361A EP0483731A2 EP 0483731 A2 EP0483731 A2 EP 0483731A2 EP 91118361 A EP91118361 A EP 91118361A EP 91118361 A EP91118361 A EP 91118361A EP 0483731 A2 EP0483731 A2 EP 0483731A2
Authority
EP
European Patent Office
Prior art keywords
circuit
heater
clothes dryer
temperature
dryer according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91118361A
Other languages
German (de)
English (en)
Other versions
EP0483731A3 (en
Inventor
Werner Dipl.-Ing. Strohmaier
Wolfgang Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zanker GmbH
Original Assignee
Zanker GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zanker GmbH filed Critical Zanker GmbH
Publication of EP0483731A2 publication Critical patent/EP0483731A2/fr
Publication of EP0483731A3 publication Critical patent/EP0483731A3/de
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 

Definitions

  • the invention relates to a tumble dryer with an interior for receiving laundry to be dried, with a blower for generating an air flow directed through the interior, with at least one heater connected to an electrical energy source for heating the air flow to a preselected temperature, with a thermostat device connected to the heater and provided for detecting the temperature of the air flow, which for switching off the heater from the energy source when an upper temperature value is exceeded and for reactivating the Heating to the energy source when the temperature falls below a minimum value, and with a monitoring circuit connected to the thermostat device in order to generate a signal dependent on the shutdowns for a display unit.
  • a clothes dryer of the type mentioned above is known from EP-A-0 312 072.
  • the thermostat When the air flow that continues to be conveyed by the fan has cooled to a lower temperature value, the thermostat switches the heating on again. In this way, the air flow that is passed through the interior of the tumble dryer is regulated between two temperature values.
  • the thermostat generally has an opening contact which is connected in series with the heater and the electrical energy source supplying the heater.
  • the air stream emerging from the interior of the tumble dryer is frequently passed through a fluff filter in order to retain the fluff which arises when the laundry is drying.
  • a fluff filter In so-called exhaust air dryers, the air flow is led directly outside, while in so-called air recirculation dryers it is returned to the blower via a condenser for separating the moisture absorbed. Since it is inevitable that the fluff filter and possibly the condenser become clogged with fluff over time, the strength of the air flow decreases, and the air flow sometimes even comes to a complete standstill. A failure of the air circulation in tumble dryers can also be caused by the fan failing.
  • a monitoring circuit is therefore provided which measures the cooling down time between switching off and switching on the heating again. If this cooling time of a decreasing or failing air flow exceeds a certain period of time, the tumble dryer is switched off. At the same time, this malfunction is visually displayed on a display unit. In this way, it should be avoided that ever longer cooling times, which inevitably go hand in hand with ever shorter heating times, lead to destruction of the heating and / or the thermostat. In addition, the user is advised by the display unit to clean the fluff filter and / or the condenser of fluff if necessary.
  • the predetermined period of time which the cooling time in the known tumble dryer must not exceed, is determined with the aid of the output voltage of an RC element, which increases exponentially over time.
  • the capacitor of this RC element begins to charge, so that the output voltage is a measure of the time which has passed since the heating was switched off.
  • the output voltage of the RC element is preselected using a comparator DC voltage value compared, which DC voltage value corresponds to a certain period of time that the RC element needs to deliver exactly this value as the output voltage.
  • the known time constant of the RC element is used as a time reference to measure the switch-off time of the heating.
  • EP-A-0 312 072 it is also known from EP-A-0 312 072 to start a stopwatch in each case after the heating has been switched off and switches off the known tumble dryer when a certain period of time is exceeded.
  • the monitoring circuit delivers the error signal on the basis of a time measurement. This is because time measurements can only be carried out with a high level of design effort with reliable accuracy and reproducibility, while the simple use of an RC element leads to very inaccurate measurement results, since among other things the time constant of an RC element depends on the ambient temperature. Since the permissible cooling time will also depend on the selected temperature of the air flow, different RC elements must be provided for the different drying programs of the tumble dryer, which leads to a structurally high effort.
  • the cooling time is not a suitable and reliable measured variable for detecting the condensation on the condenser and the fluff filter or the failure of the fan. So, in spite of any influence on the air flow, that, for example, at a relatively low drying temperature, for example for wool or when the RC elements age, the monitoring circuit does not determine that the maximum permissible cooling time has been exceeded. In addition, the permissible cooling times for the various dryer programs and air flow temperatures differ so significantly that they can only be determined empirically and therefore unreliably.
  • the object of the present invention is therefore to further develop a clothes dryer and a method of the type mentioned at the outset in such a way that these disadvantages are avoided.
  • the method should be simple to carry out and the tumble dryer should have a structurally simple and reliable structure.
  • the monitoring circuit has a counter circuit for counting the shutdowns of the heating which take place during a drying process, and in that the counter circuit is connected to the display unit.
  • this object is achieved in that the number of shutdowns which take place during a drying process is counted and displayed.
  • the object underlying the invention is completely achieved in this way.
  • the counting of the shutdowns that take place during a drying process is namely a simple and easy to carry out method with which a Slackening of the air flow is detected safely.
  • the "worse" because the decreasing air flow removes the heat from the heater, the more often the heater will reach the upper temperature value and will be switched off by the thermostat device.
  • the counting of events can be effected with simple circuitry means, which significantly reduces the design effort compared to the known time measurement method. Malfunctions can practically not occur here, so that safe monitoring of the tumble dryer is ensured.
  • the monitoring circuit has a decoding circuit which is connected to at least one of the output lines of the counter circuit corresponding to a certain number of shutdowns and via a signal line to the display unit, and if the decoding circuit generates an error signal, when a certain number of shutdowns has occurred.
  • This measure has the advantage over the known time measurement method that a one-off exceeding of the cooling time, as can occur for many reasons, does not yet lead to the output of an error signal. Furthermore, it is advantageous that for different drying programs and temperatures, the number of shutdowns can easily be determined, which indicates a malfunction in the air flow.
  • This measure is particularly advantageous because, as the applicant has found out, as a rule no more than three shutdowns occur during a drying process, even with different drying programs and temperatures, provided that the air flow is not caused by flocculation or the like. being affected. Only after three shutdowns during a drying process is the user indicated on the display unit that he must clean the condenser and the fluff filter.
  • the monitoring circuit is connected via a control line to a switching unit provided between the heater and the energy source for switching off the heating, the switching unit being opened or closed depending on the error signal.
  • This measure is particularly advantageous because it ensures that a malfunction in the air circuit not only leads to a warning to the user, but because the heating is then finally switched off in a manner known per se.
  • the decoding circuit has a diode coupling network which is connected to at least two output lines of the counter circuit and to the signal line and the control line.
  • the error signal is generated in a structurally simple manner from the output lines of the counter circuit, namely via a diode coupling network. It is a so-called wired logic that can be implemented with little design effort.
  • the decoding circuit has a memory unit, the input of which is connected to one of the output lines of the counter circuit and the output of which is connected to the signal line and the control line.
  • This measure has the advantage that once an error signal has been generated, it is stored in the monitoring circuit so that it cannot be lost even if the counter circuit continues to count or overflow due to further switch-off processes.
  • the user who may be absent during the drying operation of the tumble dryer can also recognize afterwards that the fluff filter and possibly the condenser must be cleaned.
  • the decoding circuit has a selection circuit, via which the decoding circuit can optionally be connected to one of the output lines of the counter circuit.
  • This measure is particularly advantageous because, in a structurally simple manner, different counter outputs, which correspond to different numbers of shutdowns, can be selected in order to indicate a malfunction or to finally switch off the heating.
  • the selection circuit is connected to a program control unit for selecting different drying programs, certain output lines of the counter circuit being connected to the decoding circuit as a function of the respective drying program.
  • This measure advantageously has the effect that the number of shutdowns which leads to the generation of the error signal is determined as a function of the respective drying program. This ensures that, for example, a higher number of shutdowns is tolerated at high drying temperatures and / or long drying times than at short times and / or low temperatures. This also contributes to the safe functioning monitoring of the new tumble dryer.
  • the monitoring circuit has a clock generator in order to alternately switch the display unit on and off.
  • This measure has the advantage that the user is given a periodic warning signal which he does not overlook as easily as a static signal. This ensures in a structurally simple manner that the user notices the error signal and consequently cleans the fluff filter and / or capacitor or checks the blower.
  • the monitoring circuit has a pulse shaper circuit connected between the thermostat device and an input of the counter circuit.
  • This measure ensures that only shutdowns that have actually occurred are registered by the monitoring circuit, while voltage fluctuations and the like are not counted. This known and structurally simple measure thus leads to a safe function of the monitoring circuit in the tumble dryer according to the invention.
  • the thermostat device has a temperature-dependent opening contact connected between the heater and the energy source and if the heater and the opening contact are connected via their common connection point to an input of the pulse shaping circuit.
  • connection point between the opening contact and the heating is provided with a different voltage level depending on whether the opening contact is open when an upper temperature value is exceeded or is closed when a lower temperature value is undershot.
  • a change in this voltage level by opening the opening contact to switch off the heating is converted by the pulse shaper circuit into a counting pulse to be detected by the counter circuit.
  • the monitoring circuit has a reset device at least for the counter circuit in order to set the counter circuit to zero at the beginning of a new drying process.
  • the tumble dryer has a timer which switches the tumble dryer off after a cooling time after the switching unit has been opened.
  • This measure is particularly advantageous because the fan and the motor rotating the drum are not switched off simultaneously with the heating.
  • the laundry in the drum continues to move in this way and is cooled even by the now slowly cooling air flow. Only after a cooling time preselected by the program control unit has elapsed, does the timer switch off the other consumers of the tumble dryer, thereby preventing the laundry from sticking to the still hot drum and being damaged.
  • the error signal is advantageously obtained from an easy-to-determine variable and it prevents a one-off exceeding of the cooling time of the heater as it is can occur for many reasons, already leads to the output of an error signal.
  • the method provides, as a further step, preventing the restarting when the error signal has been generated.
  • This step advantageously prevents the heater from being switched on again despite a malfunction in the air circuit, which could otherwise lead to destruction of the heater and / or the thermostat.
  • 10 designates a clothes dryer, which has a cuboid housing 11.
  • the clothes dryer 10 has an interior 12 in which laundry 13 to be dried is located.
  • the interior 12 has a drum 14 of essentially horizontal cylindrical shape.
  • the drum 14 can be rotated about a horizontal axis by means of drive means (not shown in FIG. 1).
  • An air circuit is provided to dry the laundry 13.
  • the air circuit comprises a blower 16 with a downstream heater 17, the blower 16 discharging a warm air flow 18 generated therein into a downstream duct 19.
  • the channel 19 opens into an end wall 20 of the drum 14 and thus guides the warm air flow 18 into the interior 12.
  • the warm air stream which is loaded with both steam and lint, flows at 18 ′ through an end wall 21 of the drum 14 opposite the end wall 20 into a channel 22.
  • a fluff filter 23 is arranged in the channel 22, through which the fluff is filtered out of the air flow 18 ′.
  • the duct 22 leads outside, while in the case of so-called circulating air dryers the duct 22 is returned to the blower 16 via a condenser indicated at 24.
  • the air flow 18 ′ is dried in the condenser 24 in a manner known per se.
  • the heater 17 is connected to a thermostat device, indicated at 26, which has an opening contact 27.
  • the opening contact 27 is with the heater 17 and an electrical energy source 28 as well a switching unit 29 connected in series.
  • the opening contact 27 serves to monitor the temperature of the air flow 18 and is set up to interrupt the connection between the heater 17 and the energy source 28 when the air flow 18 assumes a temperature above the response threshold of the thermostat device 26.
  • the heater 17 cools down after being switched off, the temperature of the air flow 18 drops and the thermostat device 26 closes the opening contact 27 again as soon as the temperature of the air flow 18 comes to be below a lower temperature value. In this way, the temperature of the air flow 18 is regulated between an upper temperature value and a lower temperature value.
  • the heater 17 and the opening contact 27 are connected at their common connection point 31 to a monitoring circuit 32 which, in a manner to be described in more detail, counts the number of shutdowns of the heater 17. Depending on the number of shutdowns, the monitoring circuit 32 outputs a control signal which reaches the switching unit 29 via a control line 33.
  • the switching unit 29 is opened via the control line 33 when the number of shutdowns of the heater 17 exceeds a preselected reference value. By opening the switching unit 29, the heater 17 is switched off by the electrical energy source 28 regardless of the state of the thermostat device 26, so that the air flow 18 is not further heated.
  • the monitoring circuit 32 is also connected via a signal line 34 to a display unit 35, via which it is displayed whether the number of times the heater 17 has been switched off has exceeded the preselected reference value.
  • a program control unit 36 is indicated in FIG. 1, which is operated via a rotary knob 37.
  • the program control unit 36 serves to set a specific drying program and / or a specific drying temperature and duration.
  • the program control unit 36 is also connected to the monitoring circuit 32 via a connecting line 38.
  • the connecting line 38 can be designed as a multi-core data bus, as is indicated by the two slashes in the connecting line 38.
  • the opening contact 27 will only open a few times during a drying process.
  • the air circuit malfunctions, be it that the condenser 24 and / or the fluff filter 23 are blocked by fluff, or that the fan 16 has failed, the air flows past the heater 17 considerably more slowly. In this way, the air flow 18 reaches the upper cut-off temperature considerably more often during a drying process, and the thermostat device 26 switches off the heater 17 more frequently than normal during a single drying process.
  • the number of shutdowns of the heater 17 is compared with a reference value specified by the program control unit 36 via the connecting lines 38.
  • the monitoring circuit 32 opens the switching unit 29 via the control line 33 and thus switches the heater 17 off.
  • the display unit 35 is controlled via the signal line 34, the one Glow lamp, a light emitting diode, an acoustic signal generator or a sight glass can be. The user recognizes or hears via the display unit 35 that he has to clean the fluff filter and / or the condenser 24 or that the fan 16 has failed.
  • FIG. 2 shows the monitoring circuit 32 from FIG. 1 in the form of a schematic block diagram. It can be seen that the electrical energy source 28 is connected via an on / off switch 40 to the switching unit 29, which is a relay 41 in the example shown. From the relay 41 leads on the one hand a line to the heater 17 and on the other hand a control line indicated by dashed lines to a timer 42 via which the on / off switch 40 is connected to further consumers 10 'of the clothes dryer 10.
  • connection point 31 between the heater 17 and the opening contact 27 is connected to a pulse shaping circuit 44 via an input line 43.
  • the pulse shaper circuit 44 is connected via a line 45 to an input of a counter circuit 46.
  • the counter circuit 46 is in turn connected with its output lines indicated at 47 to a decoding circuit 48, from which the control line 33 goes to the relay 41.
  • An inner section 34 ′ of the signal line 34 leads from the decoding circuit 48 to a clock generator 49, which is connected via a line 50 to a display driver 51 for the display unit 35, which in this case is designed as a light-emitting diode 52.
  • the monitoring circuit 32 has a reset device 54 which is connected both to the pulse shaping circuit 44 and to the counter circuit 46 and the decoding circuit 48.
  • the reset circuit 54 is connected to the program control unit 36 via one of the connecting lines 38, which is shown at 38 ′′ in FIG. 2.
  • the program control unit 36 is likewise connected to the decoding circuit 48 via the connecting lines 38 ′ and there, in a manner to be described in more detail below, effects the selection of a reference value for the number of times the heater 17 was switched off.
  • the monitoring circuit 32 described so far operates as follows: The heater 17 of the tumble dryer 10 is switched on in a manner known per se via the on / off switch 40. During the drying process now taking place, the air stream 18 reaches a temperature which is so high that the opening contact 27 interrupts the power supply to the heater 17.
  • the connection point 31, which has hitherto been at ground potential, is pulled to a higher voltage level by opening the opening contact 27. This change in the voltage of the connection point 31 is conducted via the input line 43 to the pulse shaping circuit 44, which in turn conducts a counting pulse to the counter circuit 46 via the line 45.
  • the counter circuit 46 represents on the output lines 47 the counted number of shutdowns of the heater 17.
  • the decoding circuit 48 In the decoding circuit 48, the output lines 47 and the reference value, which is connected via the connecting lines 36 ' is set, an error signal is generated as soon as the number of shutdowns of the heater 17 has exceeded the reference value.
  • the error signal causes the relay 41 to be opened via the control line 33, so that the heater 17 is switched off.
  • the clock generator 49 is controlled via the inner control line 34 ', which causes via its output line 50 that the display driver 51 periodically switches the light-emitting diode 52 on and off again.
  • This blinking of the light emitting diode 52 signals to the user that the heating 17 has been switched off too many times, so that he will clean the fluff filter 23 and the capacitor 24.
  • a new drying program can be started.
  • the program control unit 36 causes the reset device 54 to reset the pulse shaping circuit 44, the counter circuit 46 and the decoding circuit 48 to their initial state via the connecting line 38 ′′.
  • the shutdowns now taking place are counted from zero again.
  • the monitoring circuit 32 is shown in more detail in FIG. 3 than in FIG. 2.
  • the pulse shaping circuit 44 has a Schmitt trigger 56, the inverting output of which is connected to a clock input 57 of a counter module 58.
  • the counter module 58 is connected on its output lines 47 to a selection circuit 60, which optionally connects one of the output lines 47 to a clock input 61 of a memory unit 62, which in this case is a D flip-flop 63.
  • the selection circuit 60 is controlled by the program control unit 36 via the connecting line 38 ′.
  • the individual output lines 47 of the counter module 58 correspond - as already mentioned - to different numerical values for the number of times the heater 17 is switched off, so that the reference value is determined in that the program switching device 36 selects a selected output line 47 which e.g. corresponds to four shutdowns, connects to the storage unit 62.
  • the D flip-flop 63 is connected to the clock generator 49 via a diode 64.
  • the clock generator 49 has a Schmitt trigger 68 which is fed back through a resistor 66 and a capacitor 67 and thus oscillates, the output of which drives a transistor 70 via a further Schmitt trigger 69, which serves as a display driver for the light-emitting diode 52.
  • the output Q of the D flip-flop 63 is logic L
  • the input of the Schmitt trigger 69 is also logic L, so that the transistor 70 is turned on and the light emitting diode 52 Emits light and indicates that the tumble dryer 10 is functioning properly.
  • the light-emitting diode 52 can additionally take on the function of an operating display, which leads to a significant reduction in costs, since the indicator lamp previously provided for this purpose can be omitted.
  • the output Q of the D flip-flop 63 goes to logic H
  • the input of the Schmitt trigger 69 is released via the diode 64, so that the clock pulses of the clock generator 49 now reach the transistor 70 via the Schmitt trigger 69.
  • the diode 52 starts to flash.
  • the reset device 54 has, in a known manner, an RC element 71 which is connected to a voltage VCC, which is supplied by the program control unit 36 via the connecting line 38 ′′. If the program control unit 36 switches on the voltage VCC at the beginning of a new drying process, the capacitor of the RC element 71 takes on this voltage value only with a delay, so that the Schmitt trigger 56, the counter module 57 and the D flip-flop 63 receive the voltage VCC have already applied, while their reset inputs RST are still held at ground or logic L via the capacitor of the RC element 71. Only after a time determined by the time constant of the RC element 71, the reset inputs RST go to logic H and release the corresponding modules.
  • FIG. 4 shows another embodiment of the monitoring circuit in a representation similar to FIG. 3.
  • the signal line 34 'in FIG. 4 is connected to one of the two inputs of the Schmitt trigger 68. If the output Q of the D flip-flop 63 'is logic L, the input of the Schmitt trigger 68 is thus also logic L, so that the transistor 70 blocks and the LED 52 does not light.
  • the input of the Schmitt trigger 68 also becomes logic H, so that the clock generator 49 now begins to generate clock pulses.
  • These clock pulses from the clock generator 49 now reach the transistor 70 via the Schmitt trigger 69, so that the light-emitting diode 52 starts to flash.
  • the reset circuit 54 'shown in FIG. 4 differs from the reset circuit 54 from FIG. 3 in that it has a further inverting Schmitt trigger 72, the RC element 71' of which consists of a capacitor and two resistors.
  • the counter module 58 'and the D flip-flop 63' logically require H at their RST inputs for a reset.
  • the capacitor assumes its final voltage value only with a delay, so that the voltage VCC is still present for a certain time at the reset inputs of the counter module 58 'and the D flip-flop 63'; the blocks are reset. Only after a time determined by the time constant of the RC element, the reset inputs RST in this case go to logic L and thus release the corresponding blocks.
  • the counter circuit 46 is equipped with a binary counter 73 in a further exemplary embodiment.
  • the binary counter 73 is led with its output lines 74 via two diodes 75, which represent a diode coupling network 76, to a common interconnection point 77, which is connected to ground via a resistor 78.
  • the diode coupling network 76 thus represents a wired OR logic.
  • the Schmitt trigger 48 of the clock generator 49 is released and supplies periodic clock pulses to the transistor 70, so that the LED 52 starts to flash.
  • the output lines 74 which are connected to the diodes 75, represent two consecutive positions of the binary counter 73, the diode 75/1, for example, corresponding to four switch-offs and the diode 75/2 consequently eight switch-offs.
  • the wired OR logic ensures that the relay 41 is switched off in any case and the light emitting diode 52 remains switched on when the preselected number of switch-offs of the heater 17 has been reached. If, for example, several disconnections follow one another directly, the binary counter 73 has switched the output line 74/1 assigned to the diode 75/1 to logic L again after four further disconnections, while the output line 74/2 assigned to the diode 75/2 has now switched to logic H is. If further shutdowns occur, the second diode 75/2 ensures that the connection point 77 remains at logic H, even if the connection line 74/1 goes back to logic L again.
  • the binary counter 73 from FIG. 5 is replaced by a shift register 79, which, with its output lines 80, also the selection circuit 60 already known from FIG. 4 and connected via this to the clock generator 49 and the relay 41.
  • the D input of the shift register 79 is permanently set to logic H, so that with each pulse on line 45 a further output 80 of the shift register 79 always changes from logic L to logic H.
  • the program control unit 36 is divided into an input unit 36 ′′ and a program switching unit 36 ′.
  • the program switching mechanism 36 ' contains a microprocessor 81 which serves to control the various dryer programs.
  • a clogging indicator can be integrated particularly easily into the existing system.
  • the task of the counter module, the reset circuit and the clock generator from the monitoring circuit 32 can be taken over by the existing microprocessor 81. All that remains is to implement the pulse shaper circuit 44, the display driver 71 with the signal lamp 52 and the relay driver (not shown) for the relay 41 as additional hardware expenditure for realizing the flow indicator.
  • the pulse shaper circuit 44 is galvanically coupled to the thermostat device 26. However, it is also possible to monitor the thermostat potential-free. Three such possibilities are shown in FIGS. 8 to 10.
  • an optocoupler 82 is connected in parallel to the opening contact 27 and has a glow lamp as a transmitter and a photo resistor as a receiver.
  • a relay 83 is connected in parallel to the opening contact 27, via the contacts of which the blending circuit is controlled.
  • a transformer 84 is provided in parallel with the opening contact 27, the secondary winding of which provides the thermostat signal in low voltage.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP19910118361 1990-10-27 1991-10-28 Drier and method to monitor the temperature of a drier Withdrawn EP0483731A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4034274 1990-10-27
DE4034274A DE4034274A1 (de) 1990-10-27 1990-10-27 Waeschetrockner und verfahren zur temperaturueberwachung bei einem waeschetrockner

Publications (2)

Publication Number Publication Date
EP0483731A2 true EP0483731A2 (fr) 1992-05-06
EP0483731A3 EP0483731A3 (en) 1992-08-05

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Application Number Title Priority Date Filing Date
EP19910118361 Withdrawn EP0483731A3 (en) 1990-10-27 1991-10-28 Drier and method to monitor the temperature of a drier

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EP (1) EP0483731A3 (fr)
DE (1) DE4034274A1 (fr)

Cited By (1)

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EP0889155A1 (fr) * 1997-07-02 1999-01-07 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour détecter un disfonctionnement dans un sèche linge sèche linge utilisant un tel procédé

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DE4034274C2 (fr) 1993-07-22
DE4034274A1 (de) 1992-04-30

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