Abstract:
The present invention concerns a compression unit ( 1 ) to be used in a sealing system. The sealing system further includes a frame ( 14 - 16 ) receiving compressible units ( 20 ) for pipe penetration and/or cable entry in addition to the compression unit ( 1 ). Depending of the placing of the compression unit ( 1 ) it will abut either two inner corners ( 17, 18 ) or two walls of the frame ( 14 - 16 ). Further two supplemental parts ( 12 ) are furnished for optional used. The supplemental parts ( 12 ) are placed between the compression unit ( 1 ) and the frame ( 14 - 16 ) if the compression unit ( 1 ) is to abut against an inner corner ( 17 ) having a straight form or against walls of the frame ( 14 - 16 ).

Description:
TECHNICAL FIELD  
       [0001]     The present invention concerns a compression unit to be used in a sealing system further comprising a frame for cable entries, pipe penetrations etc. Specifically, the invention concerns a compression unit easily adaptable to different frames.  
       PRIOR ART  
       [0002]     Compression units and frames of this kind are widely used today. They are parts of systems used to seal at cable entries, pipe penetrations etc. In addition to the compression unit and the frame the systems comprise further elements or units to be placed tightly surrounding the cables, pipes etc. Normally a number of cables and/or pipes are to be received in each frame. Thus, a number of units for receiving cables and/or pipes are received in each frame. The units surrounding the cables, pipes etc. are made of a compressible material and the function of the compression unit is to compress said units to give a tight seal. A plate or partition is normally placed between the compression unit and the units for cables and/or pipes as well as between rows of units. The partitions are received slideable in the frame. Systems of this kind are used in many different environments, such as for cabinets, technical shelters, junction boxes and machines. They are used in different industrial environments, such as automotive, telecom, power generation and distribution, as well as marine and offshore.  
         [0003]     The sealing systems may have to seal against fluid, gas, fire, rodents, termites, dust, moisture etc., and may receive cables for electricity, communication, computers etc. or pipes for different gases or liquids such as water, compressed air, hydraulic fluid and cooking gas.  
         [0004]     The compression unit is normally placed at one end of the frame. Thus, the compression unit will abut against two inner corners of the frame and, therefore the form of the surfaces of the compression unit facing said corners should be adapted to the form of the inner corners. In other embodiments the compression unit is not placed at one end of the frame, in which case the compression unit will abut against a wall of the frame. In order to have a tight seal it is e.g. important that the compression unit firmly abut against the frame in which it is received.  
         [0005]     The form of the frames may vary. Some frames have rounded inner corners, while other have straight inner corners. In some frames there may be a mixture of straight and rounded inner corners. As stated above the form of the compression unit should be adapted to the form of the inner corners at which the compression unit is placed. Thus, if the inner corners of the frame are rounded the compression unit should have rounded surfaces facing the inner corners, and if the corners are straight the surfaces of the compression unit should have a straight form. Finally, if the frame has one straight and one rounded inner corner the compression unit should have a corresponding form. In embodiments where the compression unit is not placed at one end, the compression unit should have a straight form on the part abutting the frame wall. Previously compression units of different forms have been used, with one form for each form of the frame. This is of disadvantage regarding e.g. manufacture and stock keeping.  
       SUMMARY OF THE INVENTION  
       [0006]     One object of the present invention is that only one type of compression unit easily adaptable to different frames should be needed.  
         [0007]     According to the present invention a compression unit is furnished. The compression unit is used with a frame also receiving compressible units for pipe penetration and/or cable entry. The compression unit is often to abut against two inner corners of the frame. In other embodiments the compression unit is to abut against two walls of the frame. Supplemental parts are furnished for optional placement between the compression unit and one or both of the inner corners or two walls of the frame, for adapting the form of the compression unit to the form of the inner corners or the walls of the frame.  
         [0008]     Further objects and advantages of the present invention will be obvious for a person skilled in the art when reading the detailed description below of one embodiment of the present invention. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]     The invention will be explained further below by way of an example and with reference to the enclosed drawings. In the drawings:  
         [0010]      FIG. 1  is a side view of a compression unit according to the present invention in a not compressed state;  
         [0011]      FIG. 2  is a side view of the compression unit of  FIG. 1  in a compressed state;  
         [0012]      FIG. 3  is a perspective view of the compression unit of  FIGS. 1 and 2  including supplemental parts;  
         [0013]      FIG. 4  is a side view of a component made in one piece, of which the compression unit is formed; and  
         [0014]      FIG. 5  is a side view illustrating different frames in which the compression unit of the previous Figs. may be received. 
     
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS  
       [0015]     In the Figs. one example of a compression unit  1  is shown in which the present invention is used. A person skilled in the art realises that the exact design of the compression unit  1  is of no importance for the invention as such. The shown compression unit  1  is based on the compression unit of the application WO 96/11353.  
         [0016]     The compression unit  1  comprises a first pair of compressible wedges  2 ,  3 , which can be moved towards and away from each other by means of a screw  6 . The compression unit  1  further comprises a second pair of compressible wedges  4 ,  5 , which may be moved towards and away from each other in co-action with the first pair of wedges  2 ,  3 .  
         [0017]     The screw  6  is received in two sleeves  8 ,  9 . One sleeve  8 ,  9  in each of the wedges  2 ,  3  of the first pair. The sleeves  8 ,  9  are either loose parts inserted and fixed in the wedges  2 ,  3  or are integrated in the wedges  2 ,  3 , i.e. made in one piece with the wedges  2 ,  3 . The screw  6  has a first thread  10  co-acting with a thread of one of the sleeves  8  and a second thread  11  co-acting with a thread of the other sleeve  9 . One of the threads  10 ,  11  is a right-hand thread while the other is a left-hand thread. Thus, depending on the direction of rotation of the screw  6  the wedges  2 ,  3  of the first pair will move towards or away from each other. A pressure distributing plate  19  having openings for the screws  6  is used to distribute the pressure on the wedges  2 ,  3  receiving the screws  6 .  
         [0018]     The first pair of wedges  2 ,  3  is in contact with the second pair of wedges  4 ,  5  along inclined surfaces. The inclination of the contact surfaces are such that the second pair of wedges  4 ,  5  will move away from each other when the first pair of wedges  2 ,  3  are moving towards each other. When the first pair of wedges  2 ,  3  move away from each other the second pair of wedges  4 ,  5  will be moved towards each other.  
         [0019]     In use the first pair of wedges  2 ,  3  moves axially along the screw  6 , while the second pair of wedges  4 ,  5  moves radially towards and away from the screw  6 .  
         [0020]     The second pair of wedges  4 ,  5  is given such a form that each wedge  4 ,  5  has a rounded surface on the side facing an inner corner of a frame  14  receiving the compression unit  1 .  
         [0021]     The compression unit  1  may be furnished with one or two supplemental parts  12  in use. Each supplemental part  12  has two sides forming a straight corner and a rounded surface  13  to be received on the rounded surface of the compression unit  1 . The sides of the supplemental part  12  forming a straight corner are to abut against the inner corner of the frame  14 . Thus, if the frame  14  has straight inner corners  17  the supplemental parts  12  are used adapting the compression unit  1  to the straight form of the inner corners  17  of the frame  14 . If the compression unit  1  is to be placed at a distance from the ends of the frame  14 , the supplemental parts  12  are used adapting the compression unit  1  to the straight form of the walls of the frame  14 .  
         [0022]     The wedges  2 ,  3 ,  4 ,  5  are held together by a strap  7 . Thus, all the wedges  2 ,  3 ,  4 ,  5  and the strap  7  may be made as a component in one piece, as indicated in  FIG. 4 .  
         [0023]     In some embodiments the supplemental parts are integrated in the component of which the entire compression unit  1  is made. Thus, the complete compression unit  1  including the supplemental parts  12  may be made in one piece. If the supplemental parts are not needed, i.e. if the frame has rounded inner corners, the supplemental parts  11  are torn off before assembly of the compression unit  1 . The supplemental parts  12  are attached to the rest of the components in such a way that it is easy to tear off from them. This may be achieved by having a weakening of the strap  7  connecting a supplemental part  12  with the rest, such a weakening may be a perforation, a slit etc. In other embodiments the supplemental parts  12  are lose parts. In the example of  FIG. 4  the supplemental parts  12  are not integrated in the component of which the compression unit  1  is formed.  
         [0024]     As indicated above the compression unit  1  is to be used in a frame  14  receiving one or more units  20  for receiving cables and/or pipes. The function of the compression unit  1  is to compress all the units  20  in an extent enough to have a tight seal, as is known to a person skilled in the art. Partitions or plates  21  are placed between the compression unit  1  and the units  20  for cables/pipes and also between the separate rows of units  20 .  
         [0025]     In use the compression unit  1  is placed in the frame with or without the supplemental parts  12 . If both inner corners  18  of the frame  16  at which the compression unit  1  is placed are rounded the supplemental parts  12  are not used. If both corners  17  of the frame  14  at which the compression unit  1  is to be placed are straight a supplemental part  12  is placed on each surface of the compression unit  1  facing a corner  17 . If one of the corners  17  of the frame  15  is straight while the other  18  is rounded, a supplemental part  12  is only placed on the part of the compression unit  1  facing the straight corner  17 . Thus, the same compression unit  1  with or without one or two supplemental parts  12  may be used for frames  14 - 16  having inner corners  17 ,  18  with varying form. Furthermore, if the compression unit  1  is not placed at the ends of the frame  14 - 16  a supplemental part  12  is placed on each surface of the compression unit  1  facing a wall of the frame  14 .  
         [0026]     Thus, the compression unit  1  is easily adaptable to different frames  14 - 16 , by optional use of the supplemental parts  12 .