DE597455C

DE597455C - Time relay with thermal delay element

Info

Publication number: DE597455C
Application number: DEA64710D
Authority: DE
Inventors: Dipl-Ing Siegfried Scherer
Original assignee: AEG AG
Current assignee: AEG AG
Priority date: 1932-01-12
Filing date: 1932-01-12
Publication date: 1934-05-25

Description

DEUTSCHES REICHGERMAN EMPIRE

Bibliotheek Bur. Ir-d. CigendomBibliotheek Bur. Ir-d. Cigendom

19 JUN. 193419 JUN. 1934

AUSGEGEBEN AM
25. MAI 1934ISSUED ON
May 25, 1934

REICHSPATENTAMTREICH PATENT OFFICE

PATENTSCHRIFTPATENT LETTERING

JVi 597455 KLASSE 21 c GRUPPEJVi 597 455 CLASS 21c GROUP

Allgemeine Elektricitäts-Gesellschaft in Berlin*) Zeitrelais mit thermischem VerzögerungsgliedAllgemeine Elektricitäts-Gesellschaft in Berlin *) Time relay with thermal delay element

Patentiert im Deutschen Reiche vom 12. Januar 1932 abPatented in the German Empire on January 12, 1932

Es sind Zeitrelais mit thermischem Verzögerungsglied bekannt, bei denen durch aufgespeicherte Wärme bewegte Heizkörper zur Betätigung von "Kontakten benutzt werden. Bekannte Ausführungen dieser Art haben den Nachteil, daß sie eine relativ lange Zeit benötigen, bis der aufgespeicherte Wärmevorrat so weit wieder abgeleitet ist, daß das Relais für ein_neues Ansprechen arbeitsbereit ist. Um diese Nachteile zu beseitigen, hat man bereits die Auslösung von mehreren periodisch aufeinanderfolgenden Beheizungen und Abkühlungen abhängig gemacht. Das thermische VerzögerungsgEed versetzt dann durch seine periodischen Bewegungen ein Klinkenrad in Drehung. Dadurch wird die aufgespeicherte Wärmemenge für jede· Arbeitsperiode sehr gering, so daß. selbst bei langen Verzögerungszeiten das Relais rasch wieder seine Arbeitsbereitschaft erhält. Namentlich· für Relais, bei denen keine allzu hohe Genauigkeit gefordert wird, sind derartige Einrichtungen bekannt.There are timing relays with thermal delay element known in which by stored Heat moving radiators are used to actuate "contacts. Known designs of this type have the Disadvantage that they need a relatively long time until the stored heat supply is derived again so far that the relay is ready to work for a_new response is. In order to eliminate these disadvantages, one already has the triggering of several made dependent on periodic heating and cooling. That thermal deceleration device then sets in with its periodic movements Ratchet wheel in rotation. This increases the amount of heat stored for each working period very low, so that. the relay quickly even with long delay times regains its readiness to work. Namely · for relays where none too Such devices are known.

Werden nun derartige Relais mit einer Rückzugfeder ausgerüstet, dann besteht die Gefahr, daß während der rückwärtigen Bewegung des thermische^ Verzögerungsgliedes auch das Klinkenrad wieder durch die Rückzugfeder in seine ursprüngliche Lage zurück gezogen wird. Um dies zu vermeiden, schlägt die Erfindung vor, auf das Klinkenrad eine den Rücklauf verhindernde Sperrklinke einwirken zu lassen, welche in Abhängigkeit von derselben Spannung "wie das thermische Betätigungsglied beheizt wird und deren Heiz-Stromkreis mit der Betätigung der Zeitrelaiskontakte unterbrochen wird.If such relays are now equipped with a return spring, then there is Danger that during the backward movement of the thermal ^ delay element the ratchet wheel is also pulled back into its original position by the return spring will. To avoid this, the invention proposes on the ratchet wheel a to allow the backflow preventing pawl to act, which depends on same voltage "as the thermal actuator is heated and its heating circuit is interrupted when the timing relay contacts are actuated.

In der Abbildung ist das thermisch, beheizte Glied mit 1 bezeichnet, auf das eine Heizwicklung 6 einwirkt. Diese liegt an dem Steuerstromkreis 7 und. 8, der durch das Ansprechen irgendeines Betätigungsrelais, wie z. B. eines Überstromrelais, an Spannung gelegt wird. Der Bimetallstreifen 6 ist an seinem einen Ende am Relaisgehäuse befestigt, an seinem anderen als Klinke 10 ausgebildet, die in ein als Addierwerk wirkendes Klinkenrad 2 eingreift. Die Steuerleitung der Wicklung 6 ist über Kontakte 4 und 5 gelegt, welche nach erfolgter Ausbiegung des Bimetallstreifens geöffnet und mit seiner Abkühlung wieder geschlossen werden. .^ Mit dem Klinkenrad 2 steht eine weitere aus einem Bimetallstreifen 3 bestehende Klinke in Verbindung, welche in erwärmtem Zustand den Rücklauf des Klinkenrades 2 unter dem, Einfluß der Feder 11 verhindert. Mit dem Klinkenrad 2 ist ein Kontakt 12 verbunden, . der von einem Anschlag 13 aus auf den Kontakt 14 zu bewegt wird und damit den Arbeits-Stromkreis 15 und 16 des Zeitrelais schließt. Gleichzeitig werden durch das Schließen derIn the figure, the thermally heated member is denoted by 1, on which a heating coil 6 acts. This is due to the control circuit 7 and. 8, who by speaking any actuating relay such. B. an overcurrent relay, connected to voltage will. The bimetal strip 6 is attached at one end to the relay housing, formed on its other as a pawl 10, which acts as an adder Ratchet wheel 2 engages. The control line of winding 6 is laid over contacts 4 and 5, which is opened after the bimetal strip has been bent and cooled down to be closed again. . ^ With ratchet wheel 2, there is another one Bimetallic strip 3 existing pawl in connection, which in the heated state the Return of the ratchet wheel 2 under the influence of the spring 11 is prevented. With the ratchet wheel 2, a contact 12 is connected,. from a stop 13 on the contact 14 is moved and thus the working circuit 15 and 16 of the timing relay closes. At the same time, by closing the

*) Von dem Patentsudwr ist als der Erfinder angegeben worden:*) The following has been specified as the inventor of the patent publication:

Dipl.-Ing. Siegfried Scherer in Berlin.Dipl.-Ing. Siegfried Scherer in Berlin.

Claims

Contacts 12 and 14 the contacts 17 and 18 separated and thereby, the heating circuit 19, 20 of the pawl 3 interrupted.

The device works as follows: By responding to the control relay in the event of an error or any other cause, from its occurrence onwards a certain "time lapse any switching process is to be triggered, the Lines 7 and 8 are connected to voltage and - thus the bimetallic strips 1 and 3 are heated.

The bimetallic strip 1 rises upwards and thus brings the ratchet wheel 2 over the pawl 10 by one tooth. Simultaneously the contacts 4 and 5 and thus the circuit of the heating coil 6 are interrupted. So that the heat transfer from the winding 6 to the bimetallic strip 1 still continues the separation of the contacts 4 and 5 takes place, means are provided which the heat transfer delay, e.g. B. Mica interlayers between the bimetal strip 1 and the Winding 6. When contacts 4 and s open, the overflow of heat then stops not yet on the bimetal strip, and he can operate the ratchet wheel all the more safely.

Simultaneously with the bimetal strip 1 is

also heated the bimetallic strip en 3, so that it moves out of its dashed position in the moved fully excellent position in which it rests resiliently on the ratchet wheel and its Reverse rotation prevented. The time constant of the bimetal strip 3 becomes appropriate Chosen to be much smaller than that of the strip ι, thus already its first switching stroke can be exploited.

After a certain number of work cycles of the bimetallic strip 1, the contact occurs 12 on contact 14 and thereby closes the working circuit 15, 16, the actuation of a signal or the trip caused by switching operations. The interruption of the normally closed contacts 17, 18 is the heating current of the pawl 3 interrupted. As soon as it has cooled down enough that it does Ratchet wheel releases and as soon as the pawl 10 has moved back into its starting position, can the spring 11, the ratchet wheel 2 in its starting position move back. The pawl 10 must therefore the ratchet wheel 2 after each Arbeitshub fully share. If the control relay remains in its actuation position, the timing relay starts immediately to work again without external intervention.

To increase the accuracy of the relay, it is advantageous to keep the temperatures in the bimetal high above room temperature and take measures to keep the control voltage constant.

A safe working of the contacts is achieved through the use of mercury contacts or interruption points arranged in a vacuum. 'You can continue to run in parallel switched capacitors 9 are provided. If several contacts are planned, which after a different number of periodic movements of the thermal member are actuated, then the reset of the ratchet wheel 2 only after the last contact was made by interrupting the circuit of the pawl 3 causes.

Instead of a rod-shaped bimetal strip for the thermal actuator can also be a spirally wound bimetallic strip arranged coaxially with the ratchet wheel 2 ι are provided in which the heating means of a centrally arranged Resistance body takes place.

80 Pa τ ε ν ϊ λ ν si * k ii c η κ:

ι. Time relay with thermal delay element, which periodically sets a ratchet wheel in rotation, characterized in that, that the ratchet wheel (2) is acted on by a pawl (3) preventing backward movement, which is heated depending on the same voltage as the thermally controlled indexing pawl (10) and the heating circuit thereof is interrupted when the timing relay contacts (12, 14) are actuated will.

2. Time relay according to claim 1, characterized in that the Zeitkonstajitc The pawl (3) is weaker than that of the thermal indexing pawl (10).

1 sheet of drawings