Compact backup seal for a turbomachine housing

Abstract

A turbomachine, having a housing pot and a housing cover which is arranged on the housing pot forming a common contact surface, and which is in particular, screwed counter to the housing pot forming a common contact surface, and comprising a seal which is arranged in the common contact surface for sealing the common contact surface and which includes a first sealing element and a second sealing element which is arranged radially offset to the first sealing element, is provided. In order to produce a compact and yet pressure-proof housing, the first and the second sealing elements are also arranged axially offset to each other in the common contact surface.

1 - 12 . (canceled) 
     
     
         13 . A housing for a turbomachine comprising:
 a housing barrel and a housing cover which is arranged on the housing barrel via a common contact surface; and   a seal, arranged in the common contact surface, for sealing the common contact surface with a first sealing element and a second sealing element that is arranged radially offset with respect to the first sealing element, wherein the first sealing element and the second sealing element are also arranged axially offset with respect to one another;   wherein the housing has an interspace monitoring arrangement which monitors, for the seal, a monitoring space formed in the common contact surface radially between the first sealing element and the second sealing element.   
     
     
         14 . The housing as claimed in  claim 13 , wherein the first sealing element is arranged in a first sealing element receiving portion and the second sealing element is arranged in a second sealing element receiving portion, wherein the first sealing element and the second sealing element receiving portions are formed in the housing cover. 
     
     
         15 . The housing as claimed in  claim 14 , wherein the first sealing element and/or the second sealing element receiving portion is formed as a circumferential bevel on the housing cover, or that the first sealing element receiving portion is formed as a circumferential bevel and the second sealing element receiving portion is formed as a circumferential, rectangular slot or a circumferential, rectangular recess on the housing cover. 
     
     
         16 . The housing as claimed in  13 , wherein the first sealing element and the second sealing element are O-rings and/or cup seals. 
     
     
         17 . The housing as claimed in  claim 13 , wherein the first sealing element is arranged radially outside the second sealing element and the first sealing element is an O-ring and the second sealing element is a cup seal or a profile seal. 
     
     
         18 . The housing as claimed in  claim 13 , wherein the interspace monitoring arrangement has a circumferential bevel which is formed on the housing barrel and delimits the monitoring space, and which is formed on the housing barrel such that it is arranged in the common contact surface, radially and axially between the first sealing element and the second sealing element. 
     
     
         19 . The housing as claimed in  claim 18 , wherein the interspace monitoring arrangement has a bore which opens into the monitoring space in a region of the bevel, wherein the bore is formed perpendicular to the bevel. 
     
     
         20 . The housing as claimed in  claim 13 , wherein the interspace monitoring arrangement has a screw connection surface which is formed, on an outer circumferential surface of the housing barrel and which serves for screwing on a connection element for the interspace monitoring arrangement on the housing barrel. 
     
     
         21 . The housing as claimed in  claim 13 , further comprising a volute insert arranged in the housing barrel and having a common radial contact surface with the housing barrel and with the housing cover. 
     
     
         22 . The housing as claimed in  claim 21 , wherein one of the two sealing elements, in particular the radially inner sealing element of the two sealing elements, is arranged on an outer circumferential surface of the volute insert. 
     
     
         23 . The housing as claimed in  claim 13 , used in a compressor, in particular a single-shaft or geared turbocompressor, further in particular for a carbon dioxide application, an expander or a turbine. 
     
     
         24 . The housing as claimed in  claim 13 , wherein the housing cover is screwed onto the housing barrel via the common contact surface. 
     
     
         25 . The housing as claimed in  claim 20 , wherein the screw connection surface is milled on the outer circumferential surface of the housing barrel.