Pressure controlling structure and method for controlling pressure

Abstract

A pressure controlling structure (1) including a first wall (2) extending from an inlet opening (3) at least in a first direction (4) and at least partly defining a first space (5) extending in a direction parallel to the first direction (4); a first opening (6) in the first wall (2), having a first cross-sectional area and connecting the first space (5) to a second space (7) provided on the opposite side of the first wall (2); two first side walls (8) extending from the first wall (2); a second wall (9) extending between the two first side walls (8); and two second openings (10) each having a second cross-sectional area, and the second openings (10) connecting the second space (7) to a third space (11) provided on the opposite side of the second wall (9) in relation to the second space (7).

1 .- 23 . (canceled) 
     
     
         24 . A pressure controlling structure comprising:
 a first wall extending from an inlet opening at least in a first direction and at least partly defining a first space extending in a direction parallel to the first direction;   at least one first opening provided in the first wall, the first opening having a first cross-sectional area and the first opening connecting the first space to a second space, wherein the second space is provided on the opposite side of the first wall in relation to the first space;   at least two first side walls extending from the first wall in a direction at an angle greater than zero in relation to the first wall;   a second wall extending between the two first side walls;   at least two second openings, each of the second openings having a second cross-sectional area, and the second openings connecting the second space to a third space, wherein the third space is provided on an opposite side of the second wall in relation to the second space,   wherein the second openings are greater in number than the first openings, the second cross-sectional area of each second opening is smaller than the first cross-sectional area of each first opening, and a combined cross-sectional area of all of the second openings is larger than a combined cross-sectional area of all of the first openings;   at least two second side walls extending from the second wall in a direction at an angle greater than zero in relation to the second wall;   a third wall extending between the at least two second side walls; and   at least three third openings, each of the third openings having a third cross-sectional area, and the third openings connect the third space to a fourth space, wherein the fourth space is provided on the opposite side of the third wall in relation to the third space,   wherein the third openings are greater in the number than the second openings, the third cross-sectional area of each third opening is smaller than the second cross-sectional area of each second opening, and a combined cross-sectional area of all the third openings is larger than a combined cross-sectional area of all the second openings.   
     
     
         25 . The pressure controlling structure according to  claim 24 , wherein the volume of the third space is larger than the volume of the second space. 
     
     
         26 . The pressure controlling structure according to  claim 24 , further comprising at least one first dividing wall extending from the first wall in a direction at an angle greater than zero in relation to the first wall on the side of the first wall opposite to the first space and also extending in a direction parallel to the first direction. 
     
     
         27 . The pressure controlling structure according to  claim 26 , further comprising at least one second dividing wall extending from the second wall in a direction at an angle greater than zero in relation to the second wall on the side of the second wall opposite to the second space and also extending in a direction parallel to the first direction. 
     
     
         28 . The pressure controlling structure according to  claim 24 , wherein the first wall, the two first side walls and the second wall define the second space and/or the second wall, the two second side walls and the third wall define the third space. 
     
     
         29 . The pressure controlling structure according to  claim 27 , wherein the first wall, the two first side walls, the at least one first dividing wall and the second wall define the second space and/or the second wall, the two second side walls, the at least one second dividing wall and the third wall define the third space. 
     
     
         30 . The pressure controlling structure according to  claim 24 , further comprising at least one protrusion protruding in the first space, the second space, the third space and/or the fourth space to further control waves of the pressure, wherein the at least one protrusion is on at least one of: the first wall, the first side walls, the second wall or the second side walls. 
     
     
         31 . The pressure controlling structure according to  claim 24 , wherein at least one of: the first wall, the first side walls, the second wall or the second side walls is shaped to form at least one protrusion protruding in the first space, the second space, the third space and/or the fourth space to further control waves of the pressure. 
     
     
         32 . A pressure controlling structure according to  claim 24 , wherein the pressure controlling structure is formed of at least two sections split in a direction parallel to the first direction. 
     
     
         33 . The pressure controlling structure according to  claim 32 , wherein each section comprises at least one first dividing wall. 
     
     
         34 . The pressure controlling structure according to  claim 24 , wherein the pressure controlling structure is formed of at least two parts split in a direction transverse to the first direction, wherein each part comprises at least one first side wall. 
     
     
         35 . A pressure controlling structure according to  claim 34 , wherein each part comprises two or more first side walls forming two or more second spaces adjacent to each other in the first direction in the part. 
     
     
         36 . The pressure controlling structure according to  claim 32 , wherein at least one of the sections and/or parts is formed as a separate structural part. 
     
     
         37 . The pressure controlling structure according to  claim 24 , wherein the pressure controlling structure is formed as a single uniform structural part. 
     
     
         38 . The pressure controlling structure according to  claim 27 , wherein one or more first or second dividing walls are provided in an outermost space to divide the outermost space into two or more space sections. 
     
     
         39 . The pressure controlling structure according to  claim 24 , wherein in a first area of at least a part of the pressure controlling structure closest to a first end of the pressure controlling structure is provided with the inlet end the first space connected to an outermost space via openings, and in a second area of at least a part of the pressure controlling structure closest to an end opposite to the first end in the first direction the first space is not connected to the outermost space via openings. 
     
     
         40 . The pressure controlling structure according to  claim 24 , further comprising paces provided between the first space and an outermost space. 
     
     
         41 . The pressure controlling structure according to  claim 24 , wherein at least the first openings and the second openings are spread evenly along 360 degrees of a circumference surrounding the first space and the second space such that pressure provided in the first space can be dispersed evenly outwards from the first space. 
     
     
         42 . The pressure controlling structure according to  claim 41 , wherein the first cross-sectional area of each first opening is smaller than the cross-sectional area of the first space, and the combined cross-sectional area of all the first openings along the 360 degrees circumference and provided, in each case, between two adjacent first side walls in the first direction is larger than the cross-sectional area of the first space. 
     
     
         43 . A pressure controlling device comprising the pressure controlling structure according to  claim 24 . 
     
     
         44 . A method for controlling pressure comprising controlling pressure by the pressure controlling structure of  claim 24 . 
     
     
         45 . The method according to  claim 44 , wherein the method comprises
 dampening a sound caused by a pressure entering the pressure controlling structure in the first direction through an inlet opening provided at a first end of the pressure controlling structure by dispersing the pressure from a first space outwards in a radial direction.