DE625121C - Overcurrent thermal time release with room temperature compensation - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
FEBRUARY 4, 1936

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21c GROUP

2IC S 452.3O

Patented in the German Empire on October 18, 1930

It is known, in the case of triggers, whose mode of action is based on the change in the geometrical Shape of current-carrying thermal Expander is based on compensating for the influence of room temperature by using an expander through which no current flows. Such compensation is of particular importance when a release pawl is blocked by the thermal release device is, as it is particularly important with the short response distances of a latch Keeping to these routes is what counts. The easiest thing now appears to be the compensation expander immediately on that

% 5 current-flowing expander to be attached.

However, this arrangement has when attached

• an adjustment device has the disadvantage that the adjustment device also has the current flowing through it Expander is influenced directly or indirectly. Due to the simultaneous However, the setting is made more difficult if the current-carrying expander and the compensating expander are influenced. This The disadvantage is more noticeable in the case of a multi-pole version, since in in this case the special setting of each individual pole is necessary.

In other known designs, the flow-through expander acts on the compensating one without ^ attached to it ■ to be, for example, it controls the one caused by a special spring force Adjustment of the latter. With such an arrangement, however, can not easily an exact compensation can be achieved, since in this case the movement of the current-flowing expander with the movement of the compensation expander geometrically does not match. '■

Finally it is also known, the compensation expander, from the current flowing through it to be arranged separately, fixed, but adjustable, and an expander through which the current flows to let the moving intermediate part act on him. The union of this execution with the mechanical release of a latch, however, causes difficulties; it must be provided for this special equipment that the structure of the release complicate and thus make the exact setting more difficult. Instead, that's why in the known device of electrical tripping by contact has been given preference, which, however the system is naturally more expensive.

The disadvantages outlined above become apparent in the case of an overcurrent thermal time release with current-flowing thermal expanders and one not from the current thermal expander flowed through for: Compensating the room temperature, which the Release pawl is supported in a simple manner

*) The patent seeker stated as the inventor:

Hans Haas in Berlin-Haselhorst.

Claims (1)

avoided according to the invention in that the trigger used to compensate for the ■ room temperature on the one through which the current flows Expander "moved. Part, of Trigger is arranged adjustable for the purpose of setting the trigger. The invention has the advantage that the compensating expander is geometrically exactly the same or in the same way and in! can be carried out to the same degree and that only one compensating expander is necessary when there are several current-carrying expansions the part moved by these is not firmly connected to them. FIGS. 1 to 3 show an exemplary embodiment according to the invention. -It is a matter of a trigger for three-phase current, in which the thermal expanders are bimetallic strips, the three current through- • 25. Finned bimetallic strips 2, 3 and 4, which are in 'the individual phases, lie on top against the stops 5, 6, 7 of a rod 8, which forms the trigger organ of the trigger! DIE rod 8 is at ^{g: and:;} 10 stored and 30 = - is pulled to the left by a spring 11, "- ■ where its stop 12 _{abuts against the:} guide 10 and limits the spring tension. ^." .- "- ■ Type of rod 8 is' an adjusting screw 1-3, on which sits a wall nut 14. The bimetallic strip 15, through which the current does not flow, serves to compensate for the room temperature and is geometrically the same as the stroni-penetrated bimetallic strips 2, 3 and 4, is attached to the traveling nut 14. The compensation strip 15 supports a release pawl 16 against the spring 17. The mode of operation of the device is as follows: ■ · ■; "; ■. = -.- ϊ .." If the bimetallic strips 2, 3 and 4 are heated ^{by an overcurrent occurring, so that 1} they bend by j, the rod 8 is also moved by j and ^; with it ^: the compensation strip 15.If only the deflection -j corresponds to the setting of the release for a certain overcurrent, which is carried out by moving the compensation strip ig by means of the adjusting screw 13, the compensation strip 15 slides off the pawl 16 'and the triggering occurs he follows. After the bimetallic strips 2, 3 and 4 have cooled down, the return spring 11 brings the rod 8 back into the starting position, which is fixed by means of Hen stops ^. Takes z. B. the room temperature in summer, the bimetal strips 2, 3 and 4 bend under their influence to S ₁ and move the rod 8 also to S ₁ (Fig; 2) '. This shift is compensated for by the compensation strip 15, -that it "bends in the opposite direction as; the bimetallic strips 2, 3 and " 4 also bend by J _1. The one set. Trip path j corresponding to the current value then remains unchanged, and; the triggering only takes place when, in the event of an overcurrent, the rod 8 and with it the compensation strip 15 through the further, flexing bimetallic strips 2, 3 and. 4 is moved further by s. Fig. 3 shows the trigger at a room temperature that is below normal. The bimetallic strips 2, 3 and 4 have bent under the influence of room temperature to the opposite side as in FIG. 2 by S ₂ , the rod 8 not being moved. This bending of the bimetallic strips 2, 3 and 4 is compensated for by the compensation strip 15, which bends around S ₂ - in the opposite direction and thereby opens the release path j decreased. ^: _, -Bend in the event of an overcurrent ^{: the} bimetallic strips ß, 3 and 4 to the right by the path ¹ j-through, which corresponds to the setting of the trigger, they meet the stops S, 6 and 7 of the rod _{after having covered the path J 2} 8 and then take them with them by j _{s>. The} Kompensatidnsstreifen 15 then slides off the pawl 16, so that the release is brought about. Godfather ν τ an s ρ r uch: Overcurrent heat time remover with current-carrying thermal expanders and one that is not exposed to the current thermal expander to compensate for the room temperature, which affects the 105. -release pawl supported ,, characterized in that the to compensate for the Room temperature expanders (15) on the-through-the current-carrying Expander (2, 3, 4) moving part (8) of the no Trigger is arranged adjustable for the purpose of setting the trigger. "For this purpose ϊ sheet drawings"