DE8525129U1 - Fuel-heated heat source - Google Patents

Description

. ··. "·:." *. ".. D'oK ^ 'Vaiiiant GmbH U. Co.

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2nd September 1985

Fuel-heated heat source

The invention relates to a fuel-heated heat = source with a * arranged in the area of the exhaust gas system that monitors the fuel supply to the heat source and at

Occurrence of a backflow blocking temperature sensor. \

The task of such a temperature sensor is * with the |

If a back pressure occurs in the exhaust pipe, exhaust gases can escape into the installation room in which the heat = j source is to prevent reliably, in that when such a backwater occurs, the fuel = supply to the heat source is interrupted immediately. The object of the invention is to provide such a device in particular to make reliable and robust and also to ensure that the lock is unlocked once occurred, can only be carried out arbitrarily, e.g. by hand.

DE-OS 30 20 228 is already a fuel = heated heat source has become known, in which at least two with a common evaluation circuit in connection vertical temperature sensors are used. This evaluation circuit speaks to the difference between the measured values of the two Temperature sensors, one of which is the outlet to an exhaust duct and the other the outlet to the installation = room is assigned to the heat source.

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According to the invention, the ■ this significantly simplifies the setup; that with one fuel-heated heat source of the initially designated Type an actuator influenced by the temperature sensor, expandable by temperature increase in the backwater area, e.g. a bellows, a metal membrane or the like., non-positive iT \ it dcrPi Tragsr of a pawl is connected, which is in xueec Locked position to keep open a in the fuel = supply line to the heat source arranged, under the Closing pressure of a spring standing valve is used.

The considerable advantage of this device, which is used to monitor a backwater, is due to the fact that that there is only a one-time, precisely controllable cancellation of the compact design that keeps the gas supply valve open Lock is required to immediately and the gas supply to the heat source to interrupt completely, and that furthermore a "Aufauf = would then only take the gas supply arbitrarily, i.e. after checking the facts, it can be carried out.

Further features of the invention are the better intellect = Possibility because of the following on the basis of an exemplary embodiment of the subject of the invention illustrated in the drawings Standes explained.

In these drawings shows

Fig.l in a front view - half without and half with Housing cover - a gas-heated heat source, namely one. Hot water heater

Fig. 2 shows schematically the inventive Ein » direction of this heat source.

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The heat source shown as an example includes in individual burner 1 in heating shaft 2 and the one above This burner 1 arranged heat exchanger 3, to which the water to be heated is supplied via a supply line 4. Above the heat exchanger 3 is the connection = nozzle 5 of an exhaust pipe.

In the area 6 between the upper end of the heating shaft 2 and the exhaust gas nozzle 5, lateral outlets 7 are provided, which lead into the room where the device is installed, and there be = there is also the temperature sensor 8, which is operated via a capillary 9 with the device 10 shown in FIG of the valve controlling the gas supply is connected.

As Figure 2 shows, this device 10 comprises a dated Temperature sensor 8 influenced by temperature rise in the Area 6 expandable actuator, which is formed in the illustrated embodiment as a bellows 11 and with the Carrier 12 of a pawl 13 indirectly non-positively ver = is bound. This pawl 13 is used in its (shown) locking position to hold open a in the fuel supply = Line 14 to the burner 1 of the heat source arranged under the closing pressure of a compression spring 15 valve 16. The shaft 17 of the valve 16 is articulated to a lever 19 pivotable in the bearing 18, the free arm 20 of which is from the housing 21 of the device 10 protrudes. By moving this free arm in the direction of the arrow, the lock can be re-engaged at any time after it has been released.

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The bellows 11 is frictionally connected to that of a Compression spring 22 loaded in the bearing 23 pivotably mounted lever 24, which in turn against an adjustable stop 25 of the carrier 12, which is also loaded by a compression spring 26 and is also pivotably mounted in the bearing 23 the pawl 13 is supported.

The shaft 17 of the to block the fuel supply line 14 serving valve 16 is at the free end of the locking = pawl 13 engaging behind, loaded by the closing spring 15 Arm 27 of the pivotably mounted lever 19 is articulated.

To avoid the consequences of any damage in the function of the temperature sensor 8, e.g. if the capillary line 9 breaks, is also a safety device provided, which consists of a pivotable rocker 28 in the bearing 29, one arm 30 on the carrier 12 of the pawl 13 and the other arm 31 of which rests non-positively with an adjustable stop 32 on the lever 24. At an extraordinary one This device solves the reduction in the size (length) of the bellows 11 below a predetermined nominal value Blocking the open position of the fuel supply Valve 16 and this valve 16 close the gas supply line 14 under the pressure of its closing spring 15.

The gas supply to the burner 1 is interrupted in the same way if the temperature sensor overheats 8 by back pressure of the exhaust gases in the area 6 and also in the event of damage to this temperature sensor 8 or its capillary = line 9.

Claims (6)

1. Fuel-heated heat source with one arranged in the exhaust gas duct, the fuel supply for heat = temperature sensor that monitors the source and blocks the temperature sensor when a backwater occurs in the flue gas duct, characterized by a temperature sensor (8) influenced by a temperature rise in the backwater area (6) expandable actuator (11), e.g. a bellows, a metal membrane or the like., The force-fit with the Carrier (12) is connected to a pawl (13) which in its .3perrstellung to hold open a in the fuel = supply line (14) to the heat source (1) arranged under the closing pressure of a spring (15) valve (16) serves. 2. Heat source according to claim 1, characterized in that the shaft (17) to block the fuel supply line (14) serving valve (16) on a pawl (13) engaging behind the spring-loaded arm of a (at 18) swivel = bar mounted lever (19) is articulated. 3. Heat source according to claim 2, characterized in that the expandable actuator (11) is non-positive on a spring-loaded (22) pivoted lever (24) rests against an adjustable stop (25) of the likewise spring-loaded (26) carrier (12) the pawl (13) is supported r * ν 4. Heat source according to claim 3, characterized by '] one with one arm (30) on the carrier (12) of the pawl (13) ί and with the other arm (31) on the spring-loaded (22) lever (24) frictionally adjacent rocker (28), which at a reduction in the size (length) of the actuator (11) ι
«Below an adjustable setpoint the lock of the ; Fuel supply releasing valve (16) releases. 5. Heat source according to claim 4, characterized by i one on at least one arm (31) of the rocker (28) ange = f arranged adjustable stop (32). 6. Heat source according to one of claims 2 to 5, characterized in that the with an arm (27) the Pawl (13) engaging behind spring-loaded (15) - Lever (19) with its other arm (20) for engaging the Lock protrudes from the housing (21).