Exhaust pipe system

Abstract

An exhaust pipe system for conducting exhaust gas from a combustion device to an exhaust system includes a first exhaust pipe with an inlet end and an outlet end, and a second exhaust pipe having a first line end and a second line end, wherein the inlet end of the first exhaust pipe is connectable to the first line end of the second exhaust pipe via a detachable coupling connection. A locking member is arranged to be movable between a closed position closing a passage and an open position opening the passage inside the first exhaust pipe. When the coupling connection is released, the locking member is automatically arranged in the closed position, and the second exhaust pipe has an actuating member which, when the coupling connection is established, urges the locking member into the open position.

1 . An exhaust pipe system for guiding exhaust gas from a combustion device to an exhaust system, comprising:
 a first exhaust pipe with an inlet end and an outlet end, which is formed such that it can be connected to the exhaust system, and   a second exhaust pipe having a first line end and a second line end which is formed to be connectable to the combustion device,   wherein the inlet end of the first exhaust pipe is configured to be connected to the first line end of the second exhaust pipe via a detachable coupling connection,   wherein a locking member is arranged to be movable between a closed position closing a passage from the inlet end to the outlet end and an open position opening the passage within the first exhaust pipe,   wherein, when the coupling connection is removed, the locking member is automatically arranged in the closed position, and   wherein the second exhaust pipe has an actuating member which, when the coupling connection is established, urges the locking member into the open position.   
     
     
         2 . The exhaust pipe system according to  claim 1 , wherein the locking member is formed as a rotatably mounted and axially displaceable butterfly valve. 
     
     
         3 . The exhaust pipe system according to  claim 2 , wherein the actuating member is formed to move the butterfly valve in the direction of the outlet end upon movement into the open position. 
     
     
         4 . The exhaust pipe system according to  claim 2 , wherein two bearing pins arranged opposite of each other are formed on the butterfly valve and are each arranged guided in a guide track formed on the inside in the first exhaust pipe. 
     
     
         5 . The exhaust pipe system according to  claim 4 , wherein the bearing pins extend in the direction of the outlet end and radially from the butterfly valve with respect to the closed position of the butterfly valve. 
     
     
         6 . The exhaust pipe system according to  claim 4 , wherein a partial line is mounted movably within the first exhaust pipe in the direction of the outlet end and protrudes in portions from the inlet end. 
     
     
         7 . The exhaust pipe system according to  claim 6 , wherein two movement recesses arranged opposite of each other extending in the axial direction are formed in the partial line, in each of which recesses a guide projection is arranged which is formed on the inside of the first exhaust pipe and between the butterfly valve and the inlet end. 
     
     
         8 . The exhaust pipe system according to  claim 7 , wherein the partial line is mounted movably along the respective guide projection in the direction of the outlet end against the force of a mechanical resetting member. 
     
     
         9 . The exhaust pipe system according to  claim 7 , wherein two guide tracks are formed on the butterfly valve, which are formed with respect to the closed position on the side of the butterfly valve facing the inlet end, wherein two pivot pins are formed on the partial line at the end of the movement recesses, wherein the pivot pins engage in the guide tracks of the butterfly valve, wherein during a movement of the butterfly valve from the closed position into the open position, the pivot pins are designed to move from one end of the associated guide tracks to the other end of the associated guide tracks and to move the butterfly valve first axially in the direction of the outlet end and then to pivot them around the bearing pins. 
     
     
         10 . The exhaust pipe system according to  claim 6 , wherein an actuating collar protruding radially outwards is formed at the end of the partial line protruding from the inlet end, wherein the actuating member is formed as a radial web which, when the coupling connection is established, arranges the partial line displaced in the direction of the outlet end and arranges the locking member in the compressed open position. 
     
     
         11 . The exhaust pipe system according to  claim 4 , wherein the butterfly valve is coupled to an actuating arm disposed within the first exhaust pipe, wherein the actuating arm is disposed between the butterfly valve and the inlet end, and wherein the actuating arm in the closed position is arranged in a holding position retracted in the direction of the inlet end and is moved in the direction of the outlet end when the coupling connection is established, and is arranged to hold the butterfly valve in the open position. 
     
     
         12 . The exhaust pipe system according to  claim 11 , the actuating arm being mounted axially movably in a guide rail formed on the first exhaust pipe. 
     
     
         13 . The exhaust pipe system according to  claim 11 , wherein the actuating arm has a pivot recess at the end into which a pivot pin is arranged so as to be movable and guided, wherein the pivot pin is formed with respect to the closed position on the side of the butterfly valve facing the inlet end. 
     
     
         14 . The exhaust pipe system according to  claim 11 , wherein the actuating member is constructed as a tappet formed on the inside of the second exhaust pipe, which, when a coupling connection is established, arranges the actuating arm movably in the direction of the outlet end against the force of a mechanical resetting member. 
     
     
         15 . The exhaust pipe system according to  claim 1 , wherein the detachable coupling connection is a threaded connection, a bayonet connection, a latching connection or a force-fitting and/or form-fitting clamping connection. 
     
     
         16 . The exhaust pipe system according to  claim 1 , wherein the first exhaust pipe is surrounded by a first combustion air line, wherein the second exhaust pipe is surrounded by a second combustion air line wherein the first combustion air line and the second combustion air line are designed to be connectable to one another, and wherein a circumferential gap is formed between the first and the second combustion air lines and the first and the second exhaust pipes for guiding combustion air in the direction of the second line end. 
     
     
         17 . The exhaust pipe system according to  claim 16 , an external thread being formed at the first line end of the second exhaust pipe, wherein the second combustion air line is connected at the end to be connected to the first combustion air line to a connecting member via a latching connection, which is arranged inside the second combustion air line and has an internal thread, and wherein the internal thread of the connecting member is configured to be brought into engagement with the external thread of the second exhaust pipe in such a way that the coupling connection is established or removed by actuation of the second combustion air line. 
     
     
         18 . The exhaust pipe system according to  claim 17 , wherein the latching connection is formed by latching hooks which alternately engage behind a first circumferential edge and a second circumferential edge of the connecting member. 
     
     
         19 . The exhaust pipe system according to  claim 18 , wherein at least one connecting recess is formed on the connecting member, and wherein one of the latching hooks is arranged lying in the connecting recess in such a way that the connecting member and the second combustion air line are form-fittingly connected to one another.