EP0776450A1 - Circuit for the operation of an electrically actuated magnet valve - Google Patents
Circuit for the operation of an electrically actuated magnet valveInfo
- Publication number
- EP0776450A1 EP0776450A1 EP95925840A EP95925840A EP0776450A1 EP 0776450 A1 EP0776450 A1 EP 0776450A1 EP 95925840 A EP95925840 A EP 95925840A EP 95925840 A EP95925840 A EP 95925840A EP 0776450 A1 EP0776450 A1 EP 0776450A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit arrangement
- time delay
- valve
- solenoid valve
- arrangement 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 14
- 238000011156 evaluation Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000013016 damping Methods 0.000 description 6
- 230000003111 delayed effect Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/04—Refrigerators with a horizontal mullion
Definitions
- the invention relates to a circuit arrangement for the operation of an electrically controllable solenoid valve with a valve actuator which can be brought into at least two working positions, through the adjustment of which a flow path corresponding to the respective working position and loaded with a flow medium can be selected.
- Circuit arrangements according to the preamble of claim 1 are used, for example, in refrigerated cabinets with a plurality of compartments of different temperatures to control the bistable solenoid valves used there, on the basis of which the flow of refrigerant generated by a compressor in a refrigeration circuit depends on the evaporators in the compartments of different temperatures is fed according to the cold demand.
- the valve actuator of the bistable solenoid valve is moved out of the storage compartments of the refrigerator into its one or other working position in accordance with the cooling requirement. This happens by the force exerted by the electromagnets on the valve actuator, as a result of which the valve actuator is accelerated into its closed position, a clearly audible noise being generated by the closing process.
- the invention is based on the object of proposing measures which in a simple manner enable low-noise operation of an electrically controllable solenoid valve.
- a speed and the associated speed generated by the liquid flow medium are constant over the useful life of the electrically controllable solenoid valve. generates noise damping for the moving valve actuator, since the noise damping is independent of any changing material properties of materials commonly used for noise insulation, such as the aging process for plastics. Furthermore, the degree of damping for the valve actuator can be influenced in a simple manner by its geometric design.
- the portion of the flow path formed by the solenoid valve is acted upon by a liquid flow medium due to a time delay in the adjustment of the valve actuator with respect to an activation of a means driving the flow medium is achieved.
- a time delay is particularly easy to generate if, according to a further advantageous embodiment of the subject matter of the invention, it is provided that the time delay is formed by an essentially electromechanically designed timing element. In addition, such a timing element is characterized by its robust construction. According to an alternative embodiment of the object of the invention, it is provided that the time delay is formed by a timing element composed of electronic components.
- the magnitude of the time delay can also be varied in a simple manner afterwards.
- such a timing element can be implemented very inexpensively.
- the time delay is in the range between 30 seconds and 90 seconds.
- a time delay has been found to be particularly applicable if, after a next advantageous embodiment of the subject matter of the invention, it is provided that the time delay is 60 seconds.
- the means used to drive the flow medium is designed as a refrigerant compressor.
- FIG. 2 shows a section of the electronic control device with an electronic circuit arrangement for controlling an electromagnetic valve which controls the flow of refrigerant to the freezer compartment or refrigerator compartment.
- FIG. 1 shows a refrigerator and freezer combination 10, the heat-insulating housing 11 of which has two storage compartments which are thermally separated from one another by a heat-insulating partition 12 and are arranged vertically one above the other and can be closed with separate doors 13 and 14.
- the higher-lying storage compartment, which can be closed with the door 13, is designed as a cooling compartment 15, which is equipped with shelves 16 which are arranged one above the other at vertical intervals and serve to store items to be refrigerated.
- the other storage compartment, arranged below the cooling compartment 15 and separated from it by the heat-insulating intermediate wall 12, is designed as a freezer compartment 17, which has freezer containers 18 which can be pulled out in a drawer-like manner to hold frozen goods.
- Both the cooling compartment 15 and the freezer compartment 17 are equipped with evaporators (not shown), which are integrated in a refrigeration circuit (also not shown) in order to maintain their intended storage space temperature are within which a compressor which supplies the evaporators with liquid refrigerant is arranged and which is operated intermittently, the on and off phases of the compressor being dependent on the temperatures prevailing in the storage compartments.
- evaporators not shown
- a compressor which supplies the evaporators with liquid refrigerant is arranged and which is operated intermittently, the on and off phases of the compressor being dependent on the temperatures prevailing in the storage compartments.
- These are detected by temperature sensors (not shown) and processed in an evaluation logic 19 belonging to an electronic control device on the one hand to values that can be displayed in temperature display elements and on the other hand processed to a digital signal "A" which can be further processed in a circuit arrangement 30 ( see Fig. 2).
- the digital signal "A" applied to the evaluation logic 19 on the output side represents the input signal for the circuit arrangement 30, which is equipped on the input side with two RC elements which serve to achieve different time periods .
- These are formed by two ohmic resistors 31 and 32 arranged in parallel with different resistance values and a common capacitor 33 connected in series, a diode 34 being connected upstream of the resistor 32 equipped with the lower resistance value which is connected with its cathode connection to the resistor 32, so that the charging process of the capacitor 33 takes place via the higher-resistance resistor 31.
- the voltage potential generated by the charging process on the capacitor 33 is at the combined inputs of a NAND gate 35, the output signal of which is fed to the base of a PNP transistor 36, the emitter connection of which to one DC power supply "U" is connected while
- the collector connection of the PNP transistor 36 and the ohmic resistor 37 the gate connection for tapping the ignition current of a triac 38 is arranged, with its second main electrode connection one to the line pole "L" one 230 volt AC voltage coupled, monostable, two flow path switching solenoid valve 39 is connected.
- the other main electrode connection of the triac 38 is connected to the zero pole "N" of the AC voltage supply, which at the same time also forms the ground connection for this main electrode of the triac 38.
- a cooling requirement existing for the cooling compartment 15 due to the increased storage temperature therein is signaled at the output of the evaluation logic 19 by a logic one for the output signal "A", which on the one hand activates the refrigerant compressor and on the other hand switches over the monostable solenoid valve 39 Its rest position for changing the flow path for the refrigerant to the evaporator of the cooling compartment 15 means.
- the switching process of the electrically controllable solenoid valve 39 is delayed by the RC element formed by the resistor 31 and the capacitor 33 compared to the switching on process of the compressor, since the logical "one" at the output of the evaluation logic 19 only after completion of the charging process of the capacitor 33 is present at the merged inputs of the NAND gate 35 and generates a logic "zero" at its output, which is supplied to the base of the PNP transistor 36 serving as an electronic switch, as a result of which the latter is brought into the conductive state.
- the current flowing through the conduction state of the PNP transistor 36 between its emitter and its collector serves as an ignition current for the triac 38, as a result of which the circuit for the monostable solenoid valve 39 is closed, so that the desired position change as for the electro-magnetic valve actuator for redirecting the refrigerant to the evaporator of the cooling compartment 15 takes place.
- the activation of the solenoid valve 39 is delayed by the connection of the NAND gate 35 on the input side to the RC element formed from the resistor 31 and the capacitor 33, as compared to the activation of the compressor, this in itself due to the output signal "A" output by the evaluation logic 19, a cooling request for the cooling compartment 15 should take place simultaneously. Due to the time delay between the start-up of the compressor and the change in the flow path for the refrigerant through the solenoid valve 39, it is ensured that the latter is flowed through with refrigerant present in the liquid phase, so that the switching movement of the Change in direction of the valve actuator causing the flow is liquid-damped and therefore largely silent without additional damping measures. Times that can be used for the magnitude of the delay times are between 30 seconds and 90 seconds good results have already been shown, a delay time of 60 seconds proving to be favorable.
- circuit arrangement 30 made up of discrete electronic components in the exemplary embodiment, it is also conceivable to emulate its function and that on which the evaluation logic 19 is based by means of a correspondingly programmed microprocessor, so that the delayed start-up of the solenoid valve 39 relates to this Compressor could be accomplished by a corresponding software program.
- the invention can also be applied to a circuit of a bistable solenoid valve with a valve-specific circuit change then to be provided in this circuit.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Magnetically Actuated Valves (AREA)
- Compressor (AREA)
Abstract
Description
Schaltungsanordnung zum Betrieb eines elektrisch ansteu- erbaren MagnetventilsCircuit arrangement for operating an electrically controllable solenoid valve
Die Erfindung betrifft eine Schaltungsanordnung zum Be¬ trieb eines elektrisch ansteuerbaren Magnetventils mit einem wenigstens in zwei Arbeitsstellungen bringbaren Ventilstellglied, durch dessen Verstellung jeweils ein zu der jeweiligen Arbeitsstellung korrespondierender, mit einem Strömungsmedium beaufschlagter Strömungsweg aus¬ wählbar ist.The invention relates to a circuit arrangement for the operation of an electrically controllable solenoid valve with a valve actuator which can be brought into at least two working positions, through the adjustment of which a flow path corresponding to the respective working position and loaded with a flow medium can be selected.
Schaltungsanordnungen gemäß dem Oberbegriff des Anspru¬ ches 1 sind beispielsweise bei Kühlmöbeln mit mehreren Fächern unterschiedlicher Temperatur zum Ansteuern von dort zur Anwendung kommenden, bistabilen Magnetventilen im Einsatz, anhand welcher der von einem Verdichter in einem Kältekreis erzeugte Kältemittelfluß den Verdampfern in den Fächern unterschiedlicher Temperatur je nach Käl¬ tebedarf zugeleitet wird. Zu diesem Zweck wird das Ven¬ tilstellglied des bistabilen Magnetventils entsprechend der Kälteanforderung aus den Lagerfächern des Kühlmöbels in seine eine oder andere Arbeitsstellung bewegt. Dies geschieht durch die von den Elektromagneten auf das Ven¬ tilstellglied ausgeübte Kraft, infolge derer das Ventil¬ stellglied in seine Verschlußposition beschleunigt wird, wobei durch den Verschließvorgang ein deutlich hörbares Geräusch erzeugt wird. Diesem ist in der Vergangenheit durch am Ventilstellglied angeordneten Schalldämpfungs¬ maßnahmen in Form von das Verschließen der düsenartigen Zufuhröffnungen bewirkenden Kunststoffteilen Rechnung ge¬ tragen. Für derartige Kunststoffteile ist jedoch, um die¬ se an den düsenartigen Zufuhröffnungen nicht vorzeitig zu verschleißen, eine relativ hohe Shore-Härte zu wählen, was zwangsläufig wiederum eine nicht unbeachtliche Ver¬ schlechterung der Geräuschdämmung zur Folge hat.Circuit arrangements according to the preamble of claim 1 are used, for example, in refrigerated cabinets with a plurality of compartments of different temperatures to control the bistable solenoid valves used there, on the basis of which the flow of refrigerant generated by a compressor in a refrigeration circuit depends on the evaporators in the compartments of different temperatures is fed according to the cold demand. For this purpose, the valve actuator of the bistable solenoid valve is moved out of the storage compartments of the refrigerator into its one or other working position in accordance with the cooling requirement. This happens by the force exerted by the electromagnets on the valve actuator, as a result of which the valve actuator is accelerated into its closed position, a clearly audible noise being generated by the closing process. This has been taken into account in the past by sound damping measures arranged on the valve actuator in the form of plastic parts which close the nozzle-like feed openings. For such plastic parts, however, in order not to wear them prematurely at the nozzle-like feed openings, a relatively high Shore hardness should be selected, which in turn inevitably results in a not inconsiderable deterioration in the noise insulation.
Der Erfindung liegt die Aufgabe zugrunde, Maßnahmen vor¬ zuschlagen, welche auf einfache Weise einen geräuscharmen Betrieb eines elektrisch ansteuerbaren Magnetventiles er¬ möglichen.The invention is based on the object of proposing measures which in a simple manner enable low-noise operation of an electrically controllable solenoid valve.
Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Verstellung des Ventilstellgliedes in die jeweils andere Arbeitsstellung im Anschluß an eine Beaufschlagung zumindest des durch das Magnetventil gebildeten Ab¬ schnitts des Strömungsweges mit überwiegend in flüssigen Anteilen vorliegenden Strömungsmedium erfolgt.This object is achieved according to the invention in that the adjustment of the valve actuator into the respective other working position takes place following an application of at least the section of the flow path formed by the solenoid valve with flow medium predominantly present in liquid components.
Durch die erfindungsgemäße Lösung ist eine über die Brauchbarkeitsdauer des elektrisch ansteuerbaren Magnet¬ ventils gleichbleibende, durch das flüssige Strömungsme¬ dium erzeugte Geschwindigkeits- und damit verbundene Ge- räuschdämpfung für das bewegte Ventilstellglied erzeugt, da die Geräuschdämpfung von sich ggf. ändernden Werk- stoffeigenschaften von üblicherweise für Geräuschdämmung eingesetzten Werkstoffen, wie z.B. der Alterungsvorgang bei Kunststoffen, unabhängig ist. Ferner ist das Maß der Dämpfung für das Ventilstellglied auf einfache Weise durch dessen geometrische Gestaltung beeinflußbar.With the solution according to the invention, a speed and the associated speed generated by the liquid flow medium are constant over the useful life of the electrically controllable solenoid valve. generates noise damping for the moving valve actuator, since the noise damping is independent of any changing material properties of materials commonly used for noise insulation, such as the aging process for plastics. Furthermore, the degree of damping for the valve actuator can be influenced in a simple manner by its geometric design.
Nach einer weiteren bevorzugten Ausführungsform des Ge¬ genstandes der Erfindung ist vorgesehen, daß die Beauf¬ schlagung des durch das Magnetventil gebildeten Ab¬ schnitts des Strömungsweges mit flüssigem Strömungsmedium durch eine zeitliche Verzögerung der Verstellung des Ven¬ tilstellgliedes bezüglich einer Aktivierung eines das Strömungsmedium antreibenden Mittels erzielt ist.According to a further preferred embodiment of the object of the invention, it is provided that the portion of the flow path formed by the solenoid valve is acted upon by a liquid flow medium due to a time delay in the adjustment of the valve actuator with respect to an activation of a means driving the flow medium is achieved.
Durch eine derartige Lösung ist auf besonders einfache Art und Weise ohne zusätzlichen Sensoraufwand sicherge¬ stellt, daß der durch das Magnetventil gebildete Ab¬ schnitt des Strömungsweges mit flüssigem Strömungsmedium beaufschlagt ist.Such a solution ensures in a particularly simple manner without additional sensor expenditure that the portion of the flow path formed by the solenoid valve is acted upon by liquid flow medium.
Besonders einfach erzeugbar ist eine zeitliche Verzöge¬ rung, wenn nach einer weiteren vorteilhaften Ausgestal¬ tung des Gegenstandes der Erfindung vorgesehen ist, daß die zeitliche Verzögerung durch ein im wesentlichen elek- tromechanisch ausgebildetes Zeitglied gebildet ist. Zudem zeichnet sich ein derartiges Zeitglied durch seinen robu¬ sten Aufbau aus. Entsprechend einer alternativen Ausgestaltung des Gegen¬ standes der Erfindung ist vorgesehen, daß die zeitliche Verzögerung durch ein aus elektronischen Komponenten zu¬ sammengesetztes Zeitglied gebildet ist.A time delay is particularly easy to generate if, according to a further advantageous embodiment of the subject matter of the invention, it is provided that the time delay is formed by an essentially electromechanically designed timing element. In addition, such a timing element is characterized by its robust construction. According to an alternative embodiment of the object of the invention, it is provided that the time delay is formed by a timing element composed of electronic components.
Bei einer solchen Lösung kann die Größenordnung der Zeit¬ verzögerung auch im Nachhinein auf einfache Weise vari¬ iert werden. Außerdem ist ein derartiges Zeitglied äu¬ ßerst preiswert realisierbar.With such a solution, the magnitude of the time delay can also be varied in a simple manner afterwards. In addition, such a timing element can be implemented very inexpensively.
Gemäß einer weiteren bevorzugten Ausführungsform des Ge¬ genstandes der Erfindung ist vorgesehen, daß die zeitli¬ che Verzögerung im Bereich zwischen 30 sek und 90 sek liegt.According to a further preferred embodiment of the object of the invention, it is provided that the time delay is in the range between 30 seconds and 90 seconds.
Als besonders zutreffend hat sich eine zeitliche Verzöge¬ rung ergeben, wenn nach einer nächsten vorteilhaften Aus¬ gestaltung des Gegenstandes der Erfindung vorgesehen ist, daß die zeitliche Verzögerung 60 sek beträgt.A time delay has been found to be particularly applicable if, after a next advantageous embodiment of the subject matter of the invention, it is provided that the time delay is 60 seconds.
Nach einer weiteren besonders vorteilhaften Ausgestaltung des Gegenstandes der Erfindung ist vorgesehen, daß das zum Antreiben des Strömungsmediums dienende Mittel als Kältemittelverdichter ausgebildet ist.According to a further particularly advantageous embodiment of the subject matter of the invention, it is provided that the means used to drive the flow medium is designed as a refrigerant compressor.
Die Erfindung ist in der nachfolgenden Beschreibung am Beispiel eines in der beigefügten Zeichnung vereinfacht dargestellten Mehrtemperaturen-Kühlgerätes erläutert. Es zeigen: Fig. 1 ein Zweitemperaturen-Kühlgerät bei geöffneten Türen mit einem Kühlfach und einem Gefrier¬ fach, deren Temperaturen durch eine elektro¬ nische Regeleinrichtung gesteuert sind,The invention is explained in the following description using the example of a multi-temperature cooling device shown in simplified form in the accompanying drawing. Show it: 1 shows a two-temperature cooling device with opened doors with a cooling compartment and a freezer compartment, the temperatures of which are controlled by an electronic control device,
Fig. 2 einen Ausschnitt der elektronischen Regelein¬ richtung mit einer elektronischen Schaltungs¬ anordnung zur Ansteuerung eines den Kältemit¬ telfluß zum Gefrierfach bzw. Kühlfach steu¬ ernden Elektromagnetventils.2 shows a section of the electronic control device with an electronic circuit arrangement for controlling an electromagnetic valve which controls the flow of refrigerant to the freezer compartment or refrigerator compartment.
In Fig. 1 ist eine Kühl- und Gefrierkombination 10 ge¬ zeigt, deren wärmeisolierendes Gehäuse 11 zwei durch eine wärmeisolierende Zwischenwand 12 thermisch voneinander ge¬ trennte, vertikal übereinander angeordnete und mit separa¬ ten Türen 13 und 14 verschließbare Lagerfächer aufweist. Dabei ist das höherliegende, mit der Tür 13 verschließbare Lagerfach als Kühlfach 15 ausgebildet, welches mit in ver¬ tikalen Abständen übereinander angeordneten, zum Abstellen von Kühlgut dienenden Etageren 16 ausgestattet ist. Das andere unterhalb dem Kühlfach 15 angeordnete, von diesem durch die wärmeisolierende Zwischenwand 12 getrennte La¬ gerfach ist als Gefrierfach 17 ausgebildet, welches zur Aufnahme von Gefriergut schubladenartig ausziehbare Ge- friergutbehälter 18 aufweist.1 shows a refrigerator and freezer combination 10, the heat-insulating housing 11 of which has two storage compartments which are thermally separated from one another by a heat-insulating partition 12 and are arranged vertically one above the other and can be closed with separate doors 13 and 14. The higher-lying storage compartment, which can be closed with the door 13, is designed as a cooling compartment 15, which is equipped with shelves 16 which are arranged one above the other at vertical intervals and serve to store items to be refrigerated. The other storage compartment, arranged below the cooling compartment 15 and separated from it by the heat-insulating intermediate wall 12, is designed as a freezer compartment 17, which has freezer containers 18 which can be pulled out in a drawer-like manner to hold frozen goods.
Sowohl das Kühlfach 15 als auch das Gefrierfach 17 ist zur Aufrechterhaltung seiner bestimmungsgemäßen Lagerraum-Tem¬ peratur mit nicht gezeigten Verdampfern ausgestattet, wel¬ che in einen ebenso nicht gezeigten Kältekreis eingebunden sind, innerhalb welchem ein die Verdampfer mit flüssigem Kältemittel versorgender Verdichter angeordnet ist, wel¬ cher intermittierend betrieben ist, wobei die Ein- und Ausschaltphasen des Verdichters von den in den Lagerfä¬ chern herrschenden Temperaturen abhängig sind. Diese wer¬ den von nicht dargestellten Temperatursensoren erfaßt und in einer zu einer elektronischen Regeleinrichtung gehören¬ den Auswertelogik 19 einerseits zu in Temperatur-Anzeige¬ elementen anzeigbaren Werten aufbereitet und andererseits zu einem in einer Schaltungsanordnung 30 weiter verarbeit¬ barem Digitalsignal "A" verarbeitet (siehe hierzu Fig. 2) .Both the cooling compartment 15 and the freezer compartment 17 are equipped with evaporators (not shown), which are integrated in a refrigeration circuit (also not shown) in order to maintain their intended storage space temperature are within which a compressor which supplies the evaporators with liquid refrigerant is arranged and which is operated intermittently, the on and off phases of the compressor being dependent on the temperatures prevailing in the storage compartments. These are detected by temperature sensors (not shown) and processed in an evaluation logic 19 belonging to an electronic control device on the one hand to values that can be displayed in temperature display elements and on the other hand processed to a digital signal "A" which can be further processed in a circuit arrangement 30 ( see Fig. 2).
Wie insbesondere aus Fig. 2 hervorgeht, stellt das aus- gangsseitig an der Auswertelogik 19 anliegende Digitalsi¬ gnal "A" das Eingangssignal für die Schaltungsanordnung 30 dar, welche eingangsseitig mit zwei zur Erzielung unter¬ schiedlicher Zeitspannen dienenden RC-Gliedern ausgestat¬ tet ist. Diese sind durch zwei in Parallelschaltung ange¬ ordnete ohm'sehe Widerstände 31 und 32 mit unterschiedli¬ chen Widerstandswerten und einen gemeinsamen, dazu in Rei¬ henschaltung liegenden Kondensator 33 gebildet, wobei dem mit dem niedrigeren Widerstandswert ausgestatteten Wider¬ stand 32 eine Diode 34 vorgeschaltet ist, welche mit ihrem Kathodenanschluß mit dem Widerstand 32 verbunden ist, so daß der über den Ladevorgang des Kondensators 33 über den höherohmigen Widerstand 31 stattfindet. Das durch den La¬ devorgang am Kondensator 33 erzeugte Spannungspotential liegt an den zusammengeführten Eingängen eines NAND-Gat- ters 35, dessen AusgangsSignal der Basis eines PNP-Transi- stors 36 zugeführt ist, dessen Emitteranschluß an eine Gleichspannungsversorgung "U " angeschlossen ist, währendAs can be seen in particular from FIG. 2, the digital signal "A" applied to the evaluation logic 19 on the output side represents the input signal for the circuit arrangement 30, which is equipped on the input side with two RC elements which serve to achieve different time periods . These are formed by two ohmic resistors 31 and 32 arranged in parallel with different resistance values and a common capacitor 33 connected in series, a diode 34 being connected upstream of the resistor 32 equipped with the lower resistance value which is connected with its cathode connection to the resistor 32, so that the charging process of the capacitor 33 takes place via the higher-resistance resistor 31. The voltage potential generated by the charging process on the capacitor 33 is at the combined inputs of a NAND gate 35, the output signal of which is fed to the base of a PNP transistor 36, the emitter connection of which to one DC power supply "U" is connected while
B sein Kollektoranschluß über einen den Kollektorstrom be¬ grenzenden ohm1sehen Widerstand 37 mit Massepotential ver¬ bunden ist. Zwischen dem Kollektoranschluß des PNP-Transi- stors 36 und dem ohm'sehen Widerstand 37 ist der Gate-An¬ schluß zum Abgriff für den Zündstrom eines Triacs 38 ange¬ ordnet, mit dessen zweiten Hauptelektroden-Anschluß ein an den Leitungspol "L" einer 230 Volt WechselSpannung ange¬ koppeltes, monostabiles, zwei Strömungswege schaltendes Elektro-Magnetventil 39 verbunden ist. Der andere Haupt¬ elektroden-Anschluß des Triacs 38 ist dem Null-Pol "N" der Wechselspannungsversorgung verbunden, welcher zugleich auch noch den Masseanschluß für diese Hauptelektrode des Triacs 38 bildet.B its collector connection is connected to ground potential via an ohm 1 , which limits the collector current. Between the collector connection of the PNP transistor 36 and the ohmic resistor 37, the gate connection for tapping the ignition current of a triac 38 is arranged, with its second main electrode connection one to the line pole "L" one 230 volt AC voltage coupled, monostable, two flow path switching solenoid valve 39 is connected. The other main electrode connection of the triac 38 is connected to the zero pole "N" of the AC voltage supply, which at the same time also forms the ground connection for this main electrode of the triac 38.
Ein für das Kühlfach 15 aufgrund der darin angestiegenen Lagertemperatur bestehender Kältebedarf wird am Ausgang der Auswertelogik 19 durch eine logische Eins für das Aus¬ gangssignal "A" signalisiert, welches einerseits die Akti¬ vierung des K ltemittelverdichters und andererseits einen Umschaltvorgang des monostabilen Magnetventils 39 aus sei¬ ner Ruhestellung zur Änderung des Strömungsweges für das Kältemittel zum Verdampfer des Kühlfaches 15 hin bedeutet. Hierbei ist der Umschaltvorgang des elektrisch ansteuerba¬ ren Magnetventils 39 durch das aus dem Widerstand 31 und den Kondensator 33 gebildete RC-Glied gegenüber dem Ein¬ schaltvorgang des Verdichters zeitlich verzögert, da die logische "Eins" am Ausgang der Auswertelogik 19 erst nach dem Abschluß des Ladevorgangs des Kondensators 33 an den zusammengeführten Eingängen des NAND-Gatters 35 anliegt und an dessen Ausgang eine logische "Null" erzeugt, welche der Basis des als elektronischen Schalter dienenden PNP- Transistors 36 zugeführt ist, wodurch dieser in leitenden Zustand versetzt ist. Der durch den Leitungszustand des PNP-Transistors 36 zwischen dessen Emitter und dessen Kol¬ lektor fließende Strom dient als Zündstrom für den Triac 38, wodurch der Stromkreis für das monostabile Magnetven¬ til 39 geschlossen ist, so daß die gewünschte Positionsän¬ derung seines als für die Elektro-Magnete dienenden Ven¬ tilstellgliedes zur Umleitung des Kältemittels auf den Verdampfer des Kühlfaches 15 stattfindet.A cooling requirement existing for the cooling compartment 15 due to the increased storage temperature therein is signaled at the output of the evaluation logic 19 by a logic one for the output signal "A", which on the one hand activates the refrigerant compressor and on the other hand switches over the monostable solenoid valve 39 Its rest position for changing the flow path for the refrigerant to the evaporator of the cooling compartment 15 means. Here, the switching process of the electrically controllable solenoid valve 39 is delayed by the RC element formed by the resistor 31 and the capacitor 33 compared to the switching on process of the compressor, since the logical "one" at the output of the evaluation logic 19 only after completion of the charging process of the capacitor 33 is present at the merged inputs of the NAND gate 35 and generates a logic "zero" at its output, which is supplied to the base of the PNP transistor 36 serving as an electronic switch, as a result of which the latter is brought into the conductive state. The current flowing through the conduction state of the PNP transistor 36 between its emitter and its collector serves as an ignition current for the triac 38, as a result of which the circuit for the monostable solenoid valve 39 is closed, so that the desired position change as for the electro-magnetic valve actuator for redirecting the refrigerant to the evaporator of the cooling compartment 15 takes place.
Durch die eingangsseitige Beschaltung des NAND-Gatters 35 mit dem aus dem Widerstand 31 und dem Kondensator 33 ge¬ bildeten RC-Glied verzögert sich, wie bereits beschrieben, die Ansteuerung des Magnetventils 39 gegenüber der An- steuerung des Verdichters zeitlich, wobei diese an sich aufgrund des von der Auswertelogik 19 ausgegebenen Aus¬ gangssignals "A" bei einer Kälteanforderung für das Kühl¬ fach 15 gleichzeitig stattfinden müßte. Aufgrund der zeit¬ lichen Verzögerung zwischen der Inbetriebnahme des Ver¬ dichters und der Änderung des Strömungsweges für das Käl¬ temittel durch das Magnetventil 39 ist sichergestellt, daß das letztere mit in flüssiger Phase vorliegendem Kältemit¬ tel durchströmt ist, so daß die Umschaltbewegung des die Richtungsänderung für die Strömung bewirkenden Ventill¬ stellgliedes flüssigkeitsgedämpft und somit weitestgehend geräuschlos ohne zusätzliche Dämpfungsmaßnahmen stattfin¬ det. Als für die Größenordnung der Verzögerungszeiten brauchbare Zeiten haben welche zwischen 30 sek und 90 sek bereits gute Ergebnisse gezeigt, wobei sich eine Verzöge¬ rungszeit von 60 sek als günstig erwies.As already described, the activation of the solenoid valve 39 is delayed by the connection of the NAND gate 35 on the input side to the RC element formed from the resistor 31 and the capacitor 33, as compared to the activation of the compressor, this in itself due to the output signal "A" output by the evaluation logic 19, a cooling request for the cooling compartment 15 should take place simultaneously. Due to the time delay between the start-up of the compressor and the change in the flow path for the refrigerant through the solenoid valve 39, it is ensured that the latter is flowed through with refrigerant present in the liquid phase, so that the switching movement of the Change in direction of the valve actuator causing the flow is liquid-damped and therefore largely silent without additional damping measures. Times that can be used for the magnitude of the delay times are between 30 seconds and 90 seconds good results have already been shown, a delay time of 60 seconds proving to be favorable.
Genauso ist es auch möglich, anstatt der zeitlich nach dem Verdichter stattfindenden Aktivierung des Magnetventils 39 zur Sicherung der Flüssigkeitsdämpfung für das Ventil¬ stellglied einen Flüssigkeitssensor zur Überwachung des Flüssigkeitsstandes im Magnetventil 39 vorzusehen.It is also possible to provide a liquid sensor for monitoring the liquid level in the solenoid valve 39 instead of activating the solenoid valve 39 to secure the liquid damping for the valve actuator.
Hat die Lagertemperatur im Kühlfach 15 seinen bedarfsgemä¬ ßen Sollwert erreicht, wird dies über Temperatursensoren der Auswertelogik 19 signalisiert, woraufhin diese ein Si¬ gnal zur Außerbetriebnahme des Verdichters und eine logi¬ sche "Null" als AusgangsSignal "A" ausgibt. Dieses liegt als Umschaltsignal für das Magnetventil 39 um die Entlade- zeit des Kondensators 33 verzögert am Eingang des NAND- Gatters 35 an, wobei aufgrund des gegenüber dem WiderstandIf the storage temperature in the cooling compartment 15 has reached its desired value, this is signaled by temperature sensors of the evaluation logic 19, whereupon the latter outputs a signal for decommissioning the compressor and a logic "zero" as output signal "A". This is present as a changeover signal for the solenoid valve 39, delayed by the discharge time of the capacitor 33, at the input of the NAND gate 35, due to the resistance
31 sehr viel geringeren Widerstandswert für den Widerstand31 much lower resistance value for the resistance
32 der Umschaltvorgang des Magentventils 39 in seine den Strömungsweg zum Gefrierfach-Verdampfer freigebende Ruhe¬ lage nahezu gleichzeitig zum Stop des Verdichters erfolgt. Aufgrund der geringfügigen zeitlichen Verzögerung, für welche sich bereits eine Zeit von 50 ms als günstig er¬ wies, ist sichergestellt, daß zumindest der durch das Ma¬ gnetventil 39 vorgegebene Strömungsweg des Kältekreises noch mit flüssigem Kältemittel beaufschlagt ist und somit der Umschaltvorgang des Ventilstellgliedes flüssigkeitsge¬ dämpft und somit nahezu geräuschlos stattfindet. Für den Fall, daß für das Gefrierfach 17 Kältebedarf ge¬ meldet wird, ist das Ausgangssignal "A" der Auswertelogik 19 logisch "Null" , wodurch am NAND-Gatter 35 eine logische "Eins" anliegt und somit der Transistor 38 sperrt, so daß der Triac 38 inaktiv und damit das Magnetventil 39 strom¬ los ist.32 the switching process of the magnetic valve 39 into its rest position releasing the flow path to the freezer compartment evaporator takes place almost simultaneously with the stop of the compressor. Due to the slight time delay, for which a time of 50 ms has already proven to be favorable, it is ensured that at least the flow path of the refrigeration circuit specified by the magnetic valve 39 is still acted upon by liquid refrigerant and thus the switching operation of the valve actuator is liquid-sensitive ¬ dampens and thus takes place almost noiselessly. In the event that refrigeration demand is reported for the freezer compartment 17, the output signal "A" of the evaluation logic 19 is logically "zero", as a result of which a logic "one" is present at the NAND gate 35 and the transistor 38 therefore blocks, so that the triac 38 is inactive and the solenoid valve 39 is therefore de-energized.
Anstelle der im Ausführungsbeispiel aus diskreten elektro¬ nischen Bauelementen aufgebauter Schaltungsanordnung 30 ist es auch denkbar, deren und die der Auswertelogik 19 zugrundeliegende Funktion durch einen entsprechend pro¬ grammierten Mikroprozessor nachzubilden, so daß die zeit¬ lich verzögerte Inbetriebnahme des Magnetventils 39 bezüg¬ lich dem Verdichter durch ein entsprechendes Softwarepro¬ gramm bewerkstelligt sein könnte.Instead of the circuit arrangement 30 made up of discrete electronic components in the exemplary embodiment, it is also conceivable to emulate its function and that on which the evaluation logic 19 is based by means of a correspondingly programmed microprocessor, so that the delayed start-up of the solenoid valve 39 relates to this Compressor could be accomplished by a corresponding software program.
Es versteht sich, daß die Erfindung auch auf eine Beschal- tung eines bistabilen Magnetventils mit in dieser Beschal- tung dann vorzusehenden ventilspezifischen Beschaltungsän- derung anwendbar ist. It goes without saying that the invention can also be applied to a circuit of a bistable solenoid valve with a valve-specific circuit change then to be provided in this circuit.
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4429919A DE4429919A1 (en) | 1994-08-23 | 1994-08-23 | Circuit arrangement for operating an electrically controllable solenoid valve |
| DE4429919 | 1994-08-23 | ||
| PCT/EP1995/002621 WO1996006317A1 (en) | 1994-08-23 | 1995-07-06 | Circuit for the operation of an electrically actuated magnet valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0776450A1 true EP0776450A1 (en) | 1997-06-04 |
| EP0776450B1 EP0776450B1 (en) | 1998-10-07 |
Family
ID=6526379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95925840A Expired - Lifetime EP0776450B1 (en) | 1994-08-23 | 1995-07-06 | Circuit for the operation of an electrically actuated magnet valve |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6209332B1 (en) |
| EP (1) | EP0776450B1 (en) |
| CN (1) | CN1093247C (en) |
| BR (1) | BR9508754A (en) |
| DE (2) | DE4429919A1 (en) |
| DK (1) | DK0776450T3 (en) |
| ES (1) | ES2125028T3 (en) |
| PL (1) | PL179670B1 (en) |
| TR (1) | TR199500941A2 (en) |
| WO (1) | WO1996006317A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3462156B2 (en) * | 1999-11-30 | 2003-11-05 | 株式会社東芝 | refrigerator |
| US6725680B1 (en) * | 2002-03-22 | 2004-04-27 | Whirlpool Corporation | Multi-compartment refrigerator control algorithm for variable speed evaporator fan motor |
| US6952930B1 (en) | 2003-03-31 | 2005-10-11 | General Electric Company | Methods and apparatus for controlling refrigerators |
| KR20050038293A (en) * | 2003-10-21 | 2005-04-27 | 엘지전자 주식회사 | A valve control method of refrigerator |
| DE102010001458A1 (en) * | 2010-02-01 | 2011-08-04 | BSH Bosch und Siemens Hausgeräte GmbH, 81739 | Refrigerating appliance and chiller for it |
| US10231505B2 (en) | 2015-05-28 | 2019-03-19 | Nike, Inc. | Article of footwear and a charging system for an article of footwear |
| CN110805733B (en) * | 2019-11-12 | 2021-12-07 | 武汉海王新能源工程技术有限公司 | Driving device of valve for nuclear power |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3001378A (en) * | 1959-02-12 | 1961-09-26 | Gen Motors Corp | Refrigerating apparatus |
| US4439998A (en) * | 1980-09-04 | 1984-04-03 | General Electric Company | Apparatus and method of controlling air temperature of a two-evaporator refrigeration system |
| US4651535A (en) * | 1984-08-08 | 1987-03-24 | Alsenz Richard H | Pulse controlled solenoid valve |
| US4873836A (en) * | 1988-06-06 | 1989-10-17 | Eaton Corporation | Flow noise suppression for electronic valves |
-
1994
- 1994-08-23 DE DE4429919A patent/DE4429919A1/en not_active Withdrawn
-
1995
- 1995-07-06 WO PCT/EP1995/002621 patent/WO1996006317A1/en active IP Right Grant
- 1995-07-06 DK DK95925840T patent/DK0776450T3/en active
- 1995-07-06 PL PL95318461A patent/PL179670B1/en not_active IP Right Cessation
- 1995-07-06 CN CN95194741A patent/CN1093247C/en not_active Expired - Fee Related
- 1995-07-06 BR BR9508754A patent/BR9508754A/en not_active IP Right Cessation
- 1995-07-06 DE DE59503877T patent/DE59503877D1/en not_active Expired - Lifetime
- 1995-07-06 EP EP95925840A patent/EP0776450B1/en not_active Expired - Lifetime
- 1995-07-06 ES ES95925840T patent/ES2125028T3/en not_active Expired - Lifetime
- 1995-08-02 TR TR95/00941A patent/TR199500941A2/en unknown
-
1997
- 1997-02-24 US US08/805,329 patent/US6209332B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9606317A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2125028T3 (en) | 1999-02-16 |
| CN1156503A (en) | 1997-08-06 |
| DK0776450T3 (en) | 1999-06-21 |
| DE59503877D1 (en) | 1998-11-12 |
| PL179670B1 (en) | 2000-10-31 |
| CN1093247C (en) | 2002-10-23 |
| TR199500941A2 (en) | 1996-06-21 |
| PL318461A1 (en) | 1997-06-09 |
| DE4429919A1 (en) | 1996-02-29 |
| WO1996006317A1 (en) | 1996-02-29 |
| EP0776450B1 (en) | 1998-10-07 |
| BR9508754A (en) | 1998-01-13 |
| US6209332B1 (en) | 2001-04-03 |
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