Actuator device

Abstract

The present invention relates to a device which can be employed in connection with oil and/or gas wells for the purpose of increasing the well's production. The device comprises an external structure, in which external structure a first and a second pressure-influenced bellows device is mounted, where the first and second pressure-influenced bellows devices are in fluid connection with each other via a support device. At the end opposite the connection with the support device, the second pressure-influenced bellows device is connected to a movable sleeve. The device further comprises a pivotable or rotatable closing mechanism for the device, where the closing mechanism is connected to the movable sleeve.

1 . An actuator device, comprising a structure ( 1 ) having an internal through-going bore ( 2 ) and a pressure-influenced bellows comprising a first bellows ( 6 ) and a second bellows device ( 7 ) devices in fluid communication with each other, where the first ( 6 ) and second ( 7 ) bellows devices are arranged relative to the structure ( 1 ) in such a manner that during use they can experience different pressure influence, 
       characterised in that the structure ( 1 ) comprises a through-going bore ( 2 ) and the pressure-influenced bellows ( 6 ,  7 ) are mounted at least partly in an annulus which at least partly is formed by the inner wall of the structure ( 1 ) and arranged around the through-going bore and where the second bellows device ( 7 ) is connected to a mechanical device ( 9 ) for activation of a unit. 
     
     
         2 . A device according to  claim 1 , 
       characterised in that the unit is a valve device mounted in the through-going bore in the external structure for opening and closing of the through-going bore, and arranged in such a manner that this valve device can be activated between an open and a closed position by movement of the bellows as a consequence of pressure influence on the bellows. 
     
     
         3 . A device according to  claim 1  or  2 , 
       characterised in that the bellows devices are mounted relatively outside the through-going bore in the external structure. 
     
     
         4 . A device according to  claim 1  or  2 , 
       characterised in that the bellows devices are mounted at least partly internally in the through-going bore in the external structure. 
     
     
         5 . A device according to  claim 4 , 
       characterised in that a sleeve is provided internally in the bore in the external structure, at a distance therefrom, thereby forming the annulus between them, where the annulus is closed at one end, where the sleeve, the structure and the bellows are configured in such a way that one of the bellows devices is mounted in a closed space formed within this annulus. 
     
     
         6 . A device according to  claim 5 , 
       characterised in that both the first and the second bellows device are mounted in the annulus formed between the sleeve and the external structure. 
     
     
         7 . A device according to one of the above-mentioned claims, 
       characterised in that the bellows forms an annular structure. 
     
     
         8 . A device according to one of the  claims 1 - 6 , 
       characterised in that several bellows are provided along a circumference of the external structure. 
     
     
         9 . A device according to one of the above-mentioned claims, 
       characterised in that the first and second bellows devices are in fluid connection with each other via a support device, which support device forms a transverse wall in the annulus. 
     
     
         10 . A device according to  claim 1 , 
       characterised in that the first and second pressure-influenced bellows devices and the support device are filled with an incompressible fluid. 
     
     
         11 . A device according to  claim 1 , 
       characterised in that the first and second pressure-influenced bellows devices are designed with the same shape and volume. 
     
     
         12 . A device according to  claim 1 , 
       characterised in that the first and second pressure-influenced bellows devices are designed with the same shape, but with different volume. 
     
     
         13 . A device according to  claim 1 , 
       characterised in that the first and second pressure-influenced bellows devices are designed with different shape and volume.