DE2349134C3 - Safety switching device, in particular for electrically controlled, engine-independent auxiliary heating systems for vehicles - Google Patents

Description

Subject of the invention and state of the art

The invention relates to a particular for electrically controlled, engine-independent additional heat Gen of vehicles specific safety switching device with a time switch and a relay switch ter. which are in series in a control circuit, with the timer when the control circuit is closed is, according to a predetermined security circuit A main switch located in the main circuit opens and the excitation winding of the relay switch is in series with a safety switch, which is influenced by the device to be controlled.

Sound devices of this type are already available - e.g. Am the US-PS 30 7 t 183 - became known, they wiser, however, the disadvantage. that if the safety switch fails, there is no automatic switch-off the device to be controlled takes place.

task

The invention is based on the object of providing a safety switching device of the type described above to create that switches off automatically even if the safety switch fails. Furthermore, this safety cliiilteinrichtiing also carry out a self-check, d. h if other control organs fail, also one cause the controlled device to switch off automatically.

Solution

The solution to the above problem is described in claim I. Advantageous further training are specified in the subclaims.

. 23

benefits

The further embodiment of the invention according to the dependent claims results in the following advantages:

Claim 2: Security ge ^ -n line break in the .Safety circuit as well as against contact defects on the safety time switches.

Claim 3: simple control, as an additional one Switching element that reconnects the excitation winding of the timer to the power supply, not is required.

Claim 4: increased security, because in the event of a short circuit the safety device in the sign of the safety timer responds, so the defect is noticed.

Claim 5: possible simplification and thus cheaper security time scru-iters.

Claim b: Possible application for heating devices.

Claim 7: ;; n known, but ini present I especially / «angular Sicuei einrichumi :.

Claim b: Use of the circuit and its · ..-, · Security also for the advance of the combustion l'l ·.-Ju'ebiäses.

Claim 9: exploitation; ie: safety sign shutter for thermal stenciling.

Claim 10: Safeguarding the rule! onikreises against unintentional interruption.

Drawing letter

in the; Drawing is a Auslührungsbeispiei de · Friiinung shown in which the Steiiersiruinkkreis viiiivh the series connected El ·, iiienie: /.eitschaltei 1. Excitation winding 2 of the slam ehu · - ^ chaitirs' ι-.1 "I relay switch 4 is formed de: "SicrierSieitssiroinkreis .tus den in ReiV; cherished Elemciiterv. First safety device holder S. second. 'Vclierlteiiszeil · see der Ste \ ierMi "nmk [c ^il ·:>'i ^ i: der SiL'lierhei'ssli oink reis Strom erhalle', i: ··. Mcb: from an operating switch 9, 10, vinem I iaupischalle ·· 11. a switch 12 of the I liuiplleiuiiitrsrelais. a Se lud ig I ίνα 14 de :, π stell Sit.iiei iiciiszeiischaiici's 5, a further scarf link 15, which together with the second safety time screen 6 exercises the negative winding 16, and a solenoid valve 17 to which an ignition device 18 is connected in parallel; is. The safety ¹ timers 5 and 6 will be over time glicJers

jjLMnit κ, ute mi vwt π ·., ^ -. e iiue μ i> ei.ipiei Hin ·, ι uiivieient au! · transistors (9 and 20, Konder-o.toren 21 and 22 sow ι: forming voltage divider, not in detail Vrtcrten resistances exist. The safety switch 7, however, is through a photoresistor 23 in conjunction with a transistor 24 and others here controlled in individual controls that are not of interest.

The function tier voiheschric beiuMi security scarf y, lung is as follows:

A) Noi iiial operation

The Bctriehssehallei 9, 10 is closed, so that the I> rej: crwi <Hung 2 Snom, the Siaruelais t> o switch> closes, whereby the. is closed, via which through the Se'bsih.illeslrom line Π the relay winding 2 ¹ S to Ollucn iU s Siarirelaissi halteis? Receive electricity. ds

When switch 12 is closed, line 2h and the g / eyes lying in the security loop iKMi safety switch 5 and f> si .like the

134

Safety switch 7 supplies the excitation winding 8 of the relay switch 4 with current, so that the relay switch 4 opens. If the thermostat switch 27 is in the position shown, the timer elements equipped with the transistors 19 and 20 receive current via the part 10 of the operating switch and, after a certain delay time, by releasing current from the transistors 19 and 20, cause the excitation windings 28 and Ib and thus to flex a switching of the safety time switches 5 and 6. The first safety time switch 5 is switched against the safety element 14 and the second safety time switch 6 against the empty contact 29 and with a second switching element 30 against the switching element 15, whereby both the ignition 18 and the solenoid valve 17 current receive. Since the excitation winding 32 of the motor relay switch 33 receives current via the thermostat switch 27 when the operating switch 9, 10 is actuated via the eiiung 31, the Moiorrel.iisschaiter 33 is closed immediately, so that the motor 34, which generally drives a combustion air fan, starts the first switching of the safety time switches 5 and b and thus a pre-purge of the combustion chamber K-acts before the onset of the ignition and the fuel supply by means of the combustion air blower.

is. like Yurheschneben. switching the safety times !; takes place older, so can through the dam .;

eh v!; is Ma ..- ne "venii! 17 released fuel tiilaiit 'in · -.'; the e.iigesehaiiel ;: ignition 18 cmc ignition .ie 'B: Ct) ICT ₁ done via the photo resistor 2 ^ ;.; · ·;: ■: ■ a Ί; .. ··.: H ;;! R..iiig of security: -. Ehalter 7 against d'is S .. "h: iltgiieij 15 bewtikt. The excitation circuit S (.! ■ · Reiaiswitch 4. its power supply at Ums.Ji.dtv, i, e: Siv herheiszeitschalter 5 and 6 interrupted vvurdc. Ι i:. 'I |.!. Mn via the contact 35 and the reverse - <■■ '. Safety switch! 7 power again, so that the relay switch 4, which was closed when the Siromur interruption occurs, opens again.

B) cancellation ,; ' through i'i'.breaking in the Sieuei circuit

With Beiätiguiig the operating switch 9, 10 in the sense an interruption of the Sieuerstronic crisis is the Excitation winding 2 not energized and thus de; Safety relay switch 3 not closed, which is due to uv nichtschüv.-i. '. v. ^ ien switching ice 12 neither the temporal

Su
dut

that of the safety time holder 5 and 6 nor the i-'rregcrwickliing 32 of the motor relay switch 33 and neither do the solenoid valve 17 and the ignition 18 receive power. A Ben ich is therefore not possible.

C) Fault caused by short-circuiting the emitter and collector of the one influencing the safety switch 7

Transistor 24

When you turn on the operating switch 9, 10 of the safety switch 7 by the short circuit of the Si '.' InTciunchiu'i; ' immediately against the contact .35 i-eschahet. This gives the excitation development 8 ties Relay Schaiiers 4 no more electricity, what the RelaKsi-h.iiiei 4 closes and the timer 1 after the predetermined safety time, which is less than the Yerzögenings / ei! the safety line switch 5 and β since) must. responds and an interruption of the

I laiiptsi.-haliers effected. The response can go through a heating coil, the timer 1 take place after the .safety line a Spe r link 36cles main switch

I1 enables.

D) Disturbance due to short circuit of Emiuer and Collector of transistor 19 in the Zeitglicd of the most

Watch time switch p

After the operating switch 9, 10 has been switched on, the first Safety time switch 5 immediately sounded against the switching element 14. The power supply to the excitation winding 8 is thus until the second safety switch 6 switches over and the safety switch 7 responds. so at least interrupted for the intended delay / time, so that the timer 1 in the under C) described way.

E) Disturbance due to short circuit of the emitter and collector of transistor 20 in the timing element of the / while safety * -

Time switch 6

In this case, the power supply to the field winding 8 is interrupted by the after Switching on the operating sounder 9, 10 immediate switching of the second Sicherheitszcitschalters 6 and thus the addressing of the /.eitschlters 1 also in the under C ") described manner.

It was thus shown that the safety time switch 5 ii ::: 'fe not only controls the safety switch !! 7 is carried out, but that when one of the control bodies Defekl the plant shuts down uric: characterized a mutual control of the safety-timer 5 and b is given. How easily one can visualize for oneself the hand of the sound! in the event of other malfunctions - unless there is a simultaneous defect in the two safety elements - an addressing of the timer 1 and thus an interruption of the main switch U is ensured in each groove. The particular advantage of the safety device according to the invention is that it is suitable for synchronous systems. So no Slromiiniformung makes necessary, as it is required for switching devices that work with synchronous motors and cam controls.

1 sheet of drawings

Claims (10)

Patent claims: 1. Safety switchgear. especially for electrically controlled, motor-independent accessories tongues of vehicles, with a time switch and a relay switch, which are in a control current circuit lie in series, the timer when the control circuit is closed, after a predetermined Safety time causes a main switch in the main circuit to open and the excitation winding of the relay switch in a safety circuit with a safety switch is in series, which is influenced by the device to be controlled, characterized in that that in the safety circuit in series with the excitation winding (8) of the relay switch (4) and the safety switch (7) two safety line switches (5, 6), which are via Zeiiglieder (19 to 22) after an essentially the same delay line be opened and with switching elements (14, 15, 30) that are in the main circuit in Row and immediately me the opening process the safety / sounder (5. 6) close the main circuit. 2. Safety switching device according to claim 1, characterized in that when the field winding is de-energized (8) the relay switch (4) of the control circuit is closed. 3. Safety switching device according to claim 2. v> characterized in that de safety switch (7) immediately after the interruption of the safety circuit against a mi! your holding circuit connected contact n5) is created. 4. Safety switching device according to one i \ cv preceding claims, characterized in that one (6) of the Sieherheitsz.eitschülicr (5, 6) is equipped with two Schaltgliedcrn (6, .30). one of which (6) is in the Sieherheilsstromkreis and the other (30) is in the main circuit. 5. Safety switching device according to one of the The preceding claims, characterized in that one (5) of the security time sounders (5, 6) .Switching element (5) actuated at the beginning of the delay time connected to the safety circuit isi and after the delay time has elapsed, the main circuit is switched to a contact (14). 6. Security device for a heating device according to one of the preceding claims, characterized in that in the main circuit an organ controlling the fuel supply. / .. B. a solenoid valve (17) or an electro-magnetic pump and in particular also an ignition device (18) are connected, which when closing of the movement elements of the safety switch (5, 6) actuated switching elements (5, 14; 30, 15) are switched on. 7. Security cladding)! for an I lei / facility according to one of the preceding Ansiini marriage, characterized in that the safety switch (7) from a light-sensitive organ, z. I). a photo resistor (2 \) or a photo cell. 8. Security device for a security Direction according to one of the preceding claims, characterized in that when the Beiriebsschahers (9, 10) directly or via a relay (32,33) the drive motor (34) of a combustion air blower is switched on, while the Fuel supply controlling organ (17) only after the delay time has elapsed by the two Safety timer (5, 6) is connected to the power supply. 9. Sicherheitschalteinrichiung according to one of the preceding claims, characterized in that that the timers (19 to 22) via a thermally controlled switch (27) with the Main circuit are connected and when the thermally controlled switch (27) opens Moving elements of the safety time switches (5, 6) interrupt the main circuit. 10. Safety switching device according to one of the preceding claims, characterized in that the excitation winding (2) of a start relay switch (3) is in the Sienerslronicreis, which closes the circuit of the excitation winding (25 of an I lauplleitungsrelais (12, 25) when the control circuit closes When energized, a switch (12) located in the main circuit closes !, whereby when the switch (12) is closed, its excitation winding (25) is supplied with current via a self-retaining current circuit (13), even if the suirtrelay switch (3) opens.