DE6914473U - GAS SAFETY SWITCH. - Google Patents

Description

Junkers 468

PLI 1- Fu / Vo * -

February 21, 1972 J?

JUNKERS & ■ C 0. GI ¹ IBH. in Wernau / Neckar

Gas safety switch

The invention relates to a gas safety switch an ignition safety device with at least one ignition safety valve for controlling the gas supply to at least one burner gas-heated device, whereby the closing element of the ignition safety valve connected to the anchor plate of a Magneteinsätζes and from its valve seat by means of a displaceable in the axial direction Shift rod can be lifted off with an operating handle attached to it and the armature plate is attached to the electromagnet of the magnet insert can be applied, and with an electrical high-voltage ignition device Including a spark gap assigned to the burner, to which the power is only supplied in the ignition division the ignition safety valve is released while the ignition device is in all other positions by an interrupter, which when moving the switching rod of the ignition safety valve can be actuated, is grounded in the short-circuit position against the valve as a cash register.

Ignition interrupters on gas-heated devices must ensure that the electrical ignition device is only in the ignition position of the thermoelectric ignition safety valve to the effect

Junkers 468

can be brought about to reduce the risk of gas deflagration to switch off any incorrect operation of the ignition device. For this purpose, there are already arrangements on gas safety switches known, through which the power supply to the ignition electrodes of the spark gap associated with the burner, for example one chick in all positions of this chick with the exception of the ignition position via one on the housing of the gas safety switch fixed contact and a mating contact that can be rotated with the chick is prevented by short-circuiting. Since in the short-circuit position Despite the actuation of the ignition device, there is no electrical potential at the ignition electrodes, between the ignition electrodes also do not cause an electrical discharge in the form of a spark. Such an arrangement guarantees that the ignition of the pilot flame could only take place in the ignition position of the plug. Such an ignition lock or such Ignition breaker can in many cases be an insufficient distance have between the end of the contact pin and the mating contact surface, so that when the ignition device is actuated in the ignition position of the plug can jump over undesired sparks between the contacts of the interrupter, thereby generating the electrical energy is diverted to the ground and no ignition of the gas takes place even in the ignition position of the ignition safety valve, as the amount to be generated at the ignition electrodes There is no spark. This danger exists particularly when using high-voltage ignition devices such as, for example piezoelectric igniters.

In other known ignition safety devices without a plug, therefore, ignition interrupters are attached and have intermediate links actuated so that the interrupter is brought into the open or closed position when the ignition safety device is actuated so that ignition of the ignition gas can only take place in the ignition position of the ignition safety device. the known designs are quite complex to manufacture and cultivate, since the switching path of the movable breaker contact with the stroke of the actuator of the ignition

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safety device must be coordinated, which is why a certain Susceptibility to failure can hardly be avoided.

The object of the invention is to create an electrical ignition interrupter for a gas safety switch which has shortcomings known designs and avoids high-voltage ignition devices including piezoelectric ignition devices can be used. ■ ···

This task is carried out on a gas safety switch with a electrical ignition device of the type mentioned according to the invention in that the ignition interrupter within of the housing of the gas safety switch arranged in the area of the switch rod and designed as an angle lever movable contact piece is provided, the lever arm lengths of which is the ratio between the stroke of the switching rod and the required Interrupter switching distance are proportional and which 'counter to the action of an interrupter closing spring when pressed of the operating handle in the ignition position under non-positive Pivoting can be swiveled and can be lifted off the fixed mating contact in order to interrupt the short-circuit circuit.

For this purpose it is provided in a preferred embodiment, that for attaching the individual parts of the interrupter an angular profile-shaped base plate made of insulating material is provided, which is attached to a holder arranged parallel to the shift rod on the housing.

Furthermore, in the preferred embodiment, the design is so taken that on one leg of the base plate the fixed mating contact with a terminal lug for the high-voltage cable arranged and on the other leg designed as an angle lever movable contact piece of the interrupter on a bearing pin is pivotably mounted.

In addition, it is provided that on the bearing pin of the winch

Lever-shaped contact piece as an interrupter closing spring a torsion spring is arranged, one end of which the The leg of the angle lever facing away from the breaker point is applied in the closing direction, while the other end is connected to the Holder of the base plate is electrically connected as a ground.

The ignition interrupter according to the invention can in its space-saving Execution can also be installed in fittings with a particularly small design. The design of the movable breaker contact as a Vinkelhebel after it is possible that the short stroke of the operating handle serving as an actuator or the switching rod without intermediate links to ensure a rollover-free switching path between the opening ones Interrupter contacts is sufficient, since the lever arm lengths correspond to the ratio between the stroke of the switching rod and are dimensioned for the required interrupter switching distance. With simple means it is ensured that leading to disruptions Misfires are excluded.

The subject matter of the invention is explained in more detail using an exemplary embodiment shown schematically in the drawing.

Figure 1 shows a section through a gas safety switch with a built-in ignition interrupter and attached ignition device;

Figure 2 shows a front view of the ignition breaker; Figure 3 shows a side view of the ignition breaker;

In Figure 1 is a gas infiltration switch with an ignition safety valve a thermoelectric !! Ignition safety device and a thernostatgeetöuerten downstream from this Valve and an ignition interrupter according to the invention shown, with all valves in the rest position and the Ignition interrupter in the off position of the gas safety

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ern er.tü.n-ccher.ac ·: ". The conclusion is in which ^ ". built ignition device is short-circuited.

Ir. one;;; Housing IC, made of a cast part 101 and an Abaec ': cap 102 is the thermoelectric ignition safety valve 11 and the thermostat-controlled valve 12 installed as well the piezoelectric ignition device 14 is attached, the structure and The operation of such a gas safety switch is known which is why only the items essential for understanding the invention are listed. The gas safety switch consists essentially of your ignition safety valve 11 and the thermostat-controlled valve 12 to control the gas supply to:;. indcGtens a burner of a gas-heated device. The closing link 111 of the ignition safety valve 11 is πit the anchor plate 112 of a magnet insert 113 and is from the valve seat 114 by means of a shift rod that can be displaced in the axial direction 115 can be lifted off with an operating handle 116 attached to it, at the same time the anchor plate 112 to the electromagnet 117 of the magnet insert 113 is applied. The shift rod 115 a main gas valve 13 is also assigned in a known manner, the closing member 131 of which comes into contact with the valve seat 132 when the anchor plate 112 is placed. With the operating handle 110 another toothed disk 121 is positively connected, their teeth in a toothed bell 122 on the setting spindle 123 of the Intervene thermostat-controlled valve 12. When the operating handle 116 is rotated, the toothed disk 121 is also rotated, which the bell jar 122 takes along and via the adjusting spindle 123 onto the bellows 124 of the thermostat-controlled valve 12 zv / ecks temperature setting is effective.

In addition, there is also one on the cast part 101 of the housing 10 .:. Structure and mode of operation of the known piezoelectric ignition device 14, which is connected via a high-voltage cable . ... he arranged on the burner of the gas-heated device, not -.-. established spark gap is connected to which the current -.-. is supplied only in the ignition position of the ignition safety valve 11

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is released, while the ignition device 14 in all other positions, i.e. in the off position or drive position dos Ignition safety valve 11 by an ignition interrupter 15, which when shifting the switching rod 115 or the operating handle 116 of the ignition safety valve 11 can be actuated in the short-circuit position is grounded to the housing as ground, so that no discharge in the form of a spark takes place at the spark gap can. The electrical ignition device 14 consists essentially of the piezoelectric ignition device 141 with an actuating push button 142 and connecting part 143, from which a high-voltage cable 144 to the ignition breaker 15 and a not shown Cable leads to the spark gap.

According to the invention, the ignition interrupter 15 is within the Cover cap 102 of the housing 10 of the gas safety switch arranged in the area of the switching rod 115 and with an as V. 'angled lever designed movable contact piece 151 is provided, whose lever arm lengths are the ratio between the stroke of the shift rod 115 and the required interrupter switching path are proportional and which cooperates with a counter contact 152 = These contact parts 151 and 152 of the interrupter 15 are on an angled profile-shaped base plate 153 made of insulating Material arranged, which is arranged on a parallel to the switching rod 115 on the cast part 101 of the housing 10 holder 103 is attached. The fixed mating contact 152 with a terminal lug 154 is located on one leg of the base plate 153 arranged for the high-voltage cable 144 and on the other leg the movable contact piece 151 designed as an angle lever of the interrupter 15 is pivotably mounted on a bearing pin 155. On the bearing pin 155 of the contact piece 151 is as Lower gate closing spring 156 arranged a torsion spring, one end 157 of which acts on the leg of the angle lever 151 facing away from the breaker point in the closing direction, while the other end 158 to the holder 103 of the base plate 153 is electrically connected as ground. For fastening

Junkers 4-68

Pins 159 can be provided for the base plate 153 on the holder 103 be, which is formed on the base plate 153 and through corresponding holes in the holder 103 reaching through by means of retaining washers (snap rings or speed nuts) secured in position cind. In this way, the winding lever 151 is counter to the action of the Interrupter closing spring 156 when pressing the operating handle 116 m the ignition position with frictional entrainment pivotable and thereby to interrupt the short-circuit current circuit can be lifted off from the fixed mating contact 152.

The subject matter of the invention increases the desired operational reliability gas-heated devices. If the operating handle 116 is moved in When the ignition position is pressed in, the main gas valve 13 is closed and the ignition safety valve 11 is opened, so that Ignition gas is released. At the same time, when the operating handle 116 is pressed in with the toothed washer 121 by a stop, the Angle lever 151 as a movable contact piece counterclockwise counterclockwise against the torsion spring 156 acting in the closing direction swiveled out. In the process, the movable contact piece 151 is lifted from the fixed counter-contact 152 and the short-circuit position canceled. The ignition device 14 can be actuated by means of a push button 142, so that a corresponding Spark flashes over and this ignites the escaping gas.

When adjusting the ignition safety valve 11 from the ignition position into the operating position or again into the off position the operating handle 116 returns from the depressed position Position in the illustrated rest position ^ back, in which the Toothed disk 121 is lifted off the angle lever 151 and the angle lever 151 acts as a closing spring under the action of the torsion spring 156 is pivoted back into the position shown and rests with its point contact on the fixed mating contact 152. the Ignition device 14 is short-circuited again, which is why if the ignition device 14 is operated incorrectly at the spark gap no dangerous spark skips because the electrical energy is diverted to earth.

Claims (2)

Junkers 468-8 - claims 1. Gas safety switch with a thermoelectric ignition safety device with at least one ignition safety valve for controlling the gas supply to at least one burner of a gas-heated device, the closing element of the ignition safety valve with the anchor plate of a magnet insert connected and attached to its valve seat by means of a shift rod displaceable in the axial direction with an I th operating handle can be lifted and the anchor plate at the I Electromagnet of the magnet insert can be applied, and. with an electrical high-voltage ignition device included a spark gap assigned to the burner, to which the power is only supplied when the ignition valve is in the ignition position is released while the ignition device is in all other positions by an interrupter, which when moving the switching rod of the ignition safety valve can be actuated, grounded in the short-circuit position against the valve as earth is, characterized in that the ignition interrupter (15) within the housing (10) of the Gas safety switch arranged in the area of the switch rod (115) "and designed as a Y / angle lever (151) movable contact piece is provided whose lever arm lengths the ratio between the stroke of the switching rod (115) and are proportional to the required interrupter switching distance and which counteracts the effect of an interrupter closing. spring (156) when pressing the operating handle (11b) into the Ignition position can be swiveled with non-positive entrainment and at the same time to interrupt the short-circuit circuit from the fixed Counter contact (152) can be lifted off. 2. Gas safety switch according to claim 1, characterized in that for attaching the individual parts of the interrupter (15) an angular profile-shaped base ι. on. ·: on .; Plate (153) made of insulating ',.' Erkstoff α. provided iot, '.vuiche on a parallel to the ochalts ^ ange (115) on the housing (10) arranged holder (105) is attached. Gas safety switch according to Claims 1 and 2, characterized marked that an de ::, one leg of the Base plate (153) of the fixed counter con '; act (152) rr.with a connection lug (154) arranged for the high-voltage cable (144) and on the other leg that designed as a V-angle lever (151) moving contact piece of the breaker (15) on one Bearing pin (155) is pivotably mounted. Gas safety switch according to claims 1 to 3 » characterized in that on the Positioning pin (155) designed as a V / angle lever (151) Contact piece as an interrupter closing spring (156) is a torsion spring is arranged, one end (157) of which the leg of the Y / inle lever (151) facing away from the breaker point applied in the closing direction, while the other end (158) to the holder (103) of the base plate (153) as a mass is electrically connected.