Flow control for a continuous-flow water heater

Abstract

The aim of the invention is to devise a flow control for a continuous-flow water heater, which is used to control the flow of gas to a burner of a heat exchanger as a function of the passage of water, in which only one operating element has to be actuated. Because of the reduction in the apertures through the housing wall of the flow control, at the same time the risk leaks occurring is reduced. Furthermore, the expenditure in manufacturing is to be minimized. To this end, in addition to the operating element ( 8 ), a switching element ( 9 ) is rotatably mounted on a spindle ( 7 ) projecting from the water-carrying housing ( 5 ), wherein a rotary movement of the operating element ( 8 ) can be transmitted via drivers ( 10; 11 ) to the switching to element ( 9 ), which also has a switching contour ( 13 ) by means of which a fixedly arranged microswitch ( 14 ) can be actuated, by means of which an electronic ignition and monitoring device ( 3 ) can be electrically actuated, by means of which gas flow to the burner can be shut off.

1 . Flow control for a continuous-flow water heater, comprising a water part ( 1 ) controlling the passage of water to a heat exchanger wherein the quantity of water can be manually set by an operating element ( 8 ) attached to a spindle ( 7 ) projecting from the water-carrying housing ( 5 ), a gas part ( 2 ) with an electronic ignition and monitoring device ( 3 ) controlling the gas flow as a function of the passage of water to an atmospheric burner, and a mechanical transmission which transmits, as a function of the passage of water and, preferably in each case by means of a Venturi nozzle housed in the water-carrying housing and a membrane, a steering movement initially from the interior of the water-carrying housing ( 5 ) to the exterior and then from there into the gas-carrying housing ( 6 ) to a valve controlling the amount of gas, characterised in that a switching element ( 9 ) is rotatably mounted on the spindle ( 7 ), wherein a rotary movement of the operating element ( 8 ) can be transmitted by driver ( 10 ; 11 ) to the switching element ( 9 ), and that the switching element ( 9 ) has a switching contour ( 13 ), by means of which a fixedly arranged microswitch ( 14 ) can be actuated which shuts off the gas flow to the burner by means of the electronic ignition and monitoring device ( 3 ) and an electrically actuatable valve. 
     
     
         2 . Flow control for a continuous-flow water heater according to  claim 1 , characterised in that the electrically actuatable valve is formed by the servo valve of the electronic ignition and monitoring device ( 3 ). 
     
     
         3 . Flow control for a continuous-flow water heater according to  claim 1 , characterised in that the driver ( 10 ; 11 ) is formed by at least one rib ( 10 ) located on the operating element ( 8 ) and projecting into slots ( 11 ) located on the switching element ( 9 ). 
     
     
         4 . Flow control for a continuous-flow water heater according to  claim 1 , characterised in that the switching element ( 9 ) is connected to the operating element ( 8 ) by locking hooks ( 12 ). 
     
     
         5 . Flow control for a continuous-flow water heater according to  claim 1 , characterised in that the driver ( 10 ; 11 ) is formed by at least one rib ( 10 ) located on the operating element ( 8 ) and projecting into slots ( 11 ) located on the switching element ( 9 ). 
     
     
         6 . Flow control for a continuous-flow water heater according to  claim 4 , characterised in that the switching element ( 9 ) is connected to the operating element ( 8 ) by locking hooks ( 12 ). 
     
     
         7 . Flow control for a continuous-flow water heater according to  claim 2 , characterised in that the switching element ( 9 ) is connected to the operating element ( 8 ) by locking hooks ( 12 ).