DE19630164C2 - Butterfly valve in exhaust systems of internal combustion engines - Google Patents

Description

The invention relates to an actuator adjustable butterfly valve in exhaust systems from Internal combustion engines according to the preamble of claim 1.

Such a butterfly valve is known for example from DE 31 37 002 C2. In the known design, a sealing part is attached to the tube piece for sealing, which is provided with a plurality of folds. This is to create a labyrinth seal through the annular spaces formed by the folds around the actuation cases. A bearing part is connected to the sealing part. In this document it is assumed that the sealing part 4 is not tight anyway, since a perforation is provided in a ring carrier of the bearing, through which exhaust gases can flow, which have passed the labyrinth seal of the sealing part. Another solution is described in the publication in which the sealing part is designed as a pipe socket, a mechanical seal being arranged in this pipe socket. It is at least questionable whether and to what extent such a mechanical seal seals sufficiently in the arrangement there.

Based on this state of the art Invention the task of a butterfly valve Generic type to create a good Sealing the switching shaft outlet in a simple manner can be realized.

The solution to this problem is in claim 1 (Label part) specified. The preferred Further developments are in subclaims 2 and 3 designated.

The fact that the stuffing box in the tubular socket  is pressed and seals on both ends, in particular Stainless steel seals are pressed onto the selector shaft, a labyrinth-like seal is realized that still improved by the features specified in claim 3 is. In this way, the in the pipe section pending exhaust gas flow only by overcoming two emerge labyrinthine sealing points. In practice this leads to an adequate and safe Sealing is reached. By the arrangement according to Claim 3, it is additionally achieved that a sufficient axial movement according to the Adjustment options of the selector shaft counter or with Spring force is guaranteed.

An embodiment of the invention is in the Drawing shown and below in more detail described.

It shows:

Figure 1 shows the arrangement of a butterfly valve in an exhaust system.

Fig. 2 shows a detail of Fig. 1 in view, partially in section.

In the drawing, a butterfly valve 4 rotatable with an actuating element 1 , 2 , 3 is shown in an exhaust system of internal combustion engines for motor vehicles.

Two exhaust pipes 5 are connected to each other by a pipe section 6 . The butterfly valve 4 is arranged in this pipe section 6 and can be transferred from an open position according to the drawings to intermediate positions or into a closed position.

The butterfly valve 4 is coupled to a control shaft 7 , which radially emerges from the pipe section 6 and is coupled or can be coupled to the actuating element 1 , 2 , 3 .

The switching shaft outlet is preferably sealed by a stuffing box 8 .

The butterfly valve 4 is only connected to the end part of the control shaft 7 protruding into the pipe section 6 , that is to say it is only supported or supported on one side.

It is held in a prestressed manner by means of a spring element which acts axially on the control shaft 7 , so that it can follow expansions caused by heat without there being any signs of distortion. The corresponding spring element can also be arranged in the selector shaft 7 , in which case the butterfly valve is connected to the selector shaft 7 in a rotationally fixed manner with a corresponding coupling piece, but is axially displaceably held under spring force. In this way, the butterfly valve 4 is held against the wall of the pipe section 6 opposite the switching shaft inlet, which also prevents rattling noises.

In the area of the switching shaft outlet, a tubular connecting piece 9 is fixed to the tubular piece 6 so as to protrude radially. The stuffing box 8 is pressed tightly into this nozzle 9 and penetrated by the switching shaft 7 rotatable therein. The stuffing box are on the control shaft 7 at both 8 seals 10, in particular stainless steel gaskets, pressed, rotationally fixed and tightly connected to the control shaft 7, but are kept to the switching shaft rotatable relative to the inner wall of the connecting piece 9 and the stuffing box. 7

According to the exemplary embodiment, the seals 10 are designed as cup-like sealing disks, the perforated bottom of which is penetrated by the control shaft 7 and the openings of which are directed towards one another. The stuffing box 8 has recesses on the end face into which the mouths or walls of the pot-like sealing disks engage with axial play.

In this way, a labyrinth seal is formed between the inner seal 10 , the inner jacket of the connector 9 , the gland 8 , the control shaft 7 and the external seal 10 and the inner jacket of the connector 9 . This ensures a tight arrangement in a simple manner, wherein, in addition, the corresponding arrangement of the seal 10 provided with axial play permits movement of the selector shaft 7 together with the butterfly valve 4 under the action of a spring.

Claims (3)

1. With an actuating element adjustable butterfly valve ( 4 ) in exhaust systems of internal combustion engines, in particular for motor vehicles, the butterfly valve ( 4 ) being arranged in a pipe section ( 6 ) of an exhaust system and being adjustable into a blocking, an opening and, if appropriate, intermediate positions, wherein the butterfly valve ( 4 ) is coupled to a control shaft ( 7 ) which radially emerges from the pipe section ( 6 ) and can be coupled or coupled to the actuating element ( 1 , 2 , 3 ), the butterfly valve ( 4 ) also being connected only which projects into the pipe section (6) end portion of the switching shaft (7) is connected by means of an axially acting on the control shaft (7) or by means of a bearing against the switching shaft (7), axial forces acting on the butterfly valve (4) the spring element against the the wall of the pipe section ( 6 ) opposite the switching shaft inlet is held in contact, finally in the region of the switching shaft outlet on the Tubular piece (6) is radially projectingly arranged a tubular piece (9) and fixed, and the shift shaft outlet is sealed, characterized in that the switching shaft outlet is sealed by a stuffing box (8), which is pressed into the socket (9) and of the the rotatable selector shaft ( 7 ) is penetrated, and that seals ( 10 ) are pressed onto the selector shaft ( 7 ) at both ends of the stuffing box ( 8 ), which are rotatably and tightly connected to the selector shaft ( 7 ), but to the selector shaft ( 7 ) are rotatably arranged relative to the inner wall of the nozzle ( 9 ), so that a labyrinth seal between the inner seal ( 10 ) and inner jacket of the connector ( 9 ), gland ( 8 ) and control shaft ( 7 ), as well as external seal ( 10 ) and inner jacket of the connector ( 6 ) is formed. 2. Butterfly valve according to claim 1, characterized in that the seals ( 10 ) are stainless steel seals. 3. Butterfly valve according to claim 1 or 2, characterized in that the seals ( 10 ) are designed as pot-like sealing washers, the perforated bottom of which is penetrated by the control shaft ( 7 ) and the mouths of which are directed towards one another, and that the stuffing box ( 8 ) has recesses in the front, into which the mouths of the cup-like sealing disks engage with axial movement play.