Abstract:
The invention relates to a frame (R) for a solar Module, wherein the frame (R) comprises a plurality of aluminum extruded profiles (SP), which form the sides of the frame (R) and which are connected to each other at the corners thereof; wherein at least one aluminum extruded profile (SP) comprises at least one hollow chamber (H), wherein the frame (R) comprises corner elements (E, E′), wherein at least one corner element (E, E′) comprises a discharge opening ( 18,  AB), and the discharge opening ( 18,  AB) is connected to a hollow chamber (H) of at least one adjacent aluminum extruded profile (SP).

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a continuation of U.S. patent application Ser. No. 13/062,087, filed on Mar. 29, 2011, entitled “SOLAR MODULE FRAMES HAVING WATER DRAIN,” which is 371 of International Application No. PCT/EP09/06354, filed on Sep. 2, 2009, entitled “SOLAR MODULE FRAMES HAVING WATER DRAIN,” which is the international application of German Patent Application No. 10 2008 045 540.5, filed on Sep. 3, 2008, the entire contents of which are incorporated herein by reference in their entireties. 
     
    
     BACKGROUND 
       [0002]    The present invention relates to a frame for a solar module, wherein the frame comprises a plurality of aluminum extruded profiles, which form the sides of the frame and which are connected to one another at the corners thereof, wherein at least one aluminum extruded profile comprises at least one hollow chamber. 
         [0003]    Frames for solar modules are often produced from aluminum extruded profiles. The extruded profiles are in the process sawn to length and mitered and connected to one another by means of insert-able corner connectors. When frost occurs, any rainwater or condensation water which may have penetrated can damage or destroy the frame. To prevent this, it is essential to make sure that the water can flow out of the frame. Holes are drilled or punched into the hollow chambers of the frame for this purpose. The miter-cut profiles are connected to one another by means of corner connectors. 
         [0004]    The disadvantage with the above described frames is the extra effort required to produce the discharge holes and the holes for the electrical equipotential bonding. 
       SUMMARY 
       [0005]    The object of the present invention is to further develop a frame, which is produced from aluminum extruded profiles, to the effect that no discharge drill holes have to be incorporated into the extruded profiles of the frame. 
         [0006]    This object is achieved according to the invention by the frame comprising corner elements, wherein at least one corner element comprises a discharge opening and the discharge opening is connected to a hollow Chamber of at least one adjacent aluminum extruded profile. 
         [0007]    It is particularly advantageous if the aluminum extruded profiles are electrically connected to electrically conductive connectors which can be inserted into the open face sides of the aluminum extruded profiles. Electrical equipotential bonding is hereby ensured between all frame parts. 
         [0008]    The connectors at the same time can be or are advantageously pressed in a force-fit manner into the open face sides of the aluminum extruded profiles. A secure and stable connection is hereby produced between the extruded profiles. The connectors advantageously comprise ribs which, after they have been inserted into the face sides, press with their ends against the inner wall of the aluminum extruded profiles, so that the connectors cannot inadvertently slip out of the face sides of the extruded profiles. The ribs are in the process only integrally formed with one side onto the base body of the connectors and can easily spring away towards one side when inserted. In addition, the connector is advantageously formed as an extruded profile which is cut to length. The base body of the connector is formed by two plates which are integrally formed together at right angles to one another, from the flat sides of which the ribs in each case protrude outwards and/or inwards at an angle. The angle can be between 90° and 20°. The angle of a rib is advantageously 45° in relation to the plates of the base body. The width of the plates at the same time advantageously corresponds to the height of a hollow chamber of the aluminum extruded profile. Ultimately, any length of the plates of the connector and hence any penetration depth into the face side openings of the aluminum extruded profiles of the frame can be chosen. Sufficient stability should, however:, be ensured. The connector can also be manufactured from aluminum. 
         [0009]    The corner element can advantageously be attached to a connector. In this way, connector and corner element can be designed so that the corner element can be slid onto the connector or attached to this by means of a snap-in or snap-fit connection. Additional fixing means, like for example screws, can be provided for attaching the corner element to the connector. However, these not only increase the production costs but also add to the time and effort required to assemble the frame according to the invention. 
         [0010]    In one preferred embodiment, a corner element comprises two sides which are in particular arranged perpendicular to one another and which are arranged parallel to the face sides of the aluminum extruded profiles and abut on these in the assembled state. 
         [0011]    Advantageously, the aluminum extruded profiles are not mitered to 45°, so that outer walls of the aluminum extruded profiles do not adjoin one another and the frame ultimately has sharp-edged corners. In fact, the invention makes provision for the corners of the frame to be formed by the corner elements. The corner elements can be manufactured from aluminum or plastic. Plastic is appropriate if the corners have to be made of a material which is a bit softer, so that the corner elements when fitting the frame at one corner are not damaged or ultimately only the easily replaceable corner element is damaged or ruined. Preferably, the corners of the corner elements can be round or at least rounded. 
         [0012]    In one particularly preferred embodiment, the corner elements are designed in such a way that they connect aluminum extruded profiles to one another which are cut exactly to length and are arranged at right angles to one another, so that only negligible gaps occur between the walls abutting one another. 
         [0013]    It is advantageous if the corner elements, in particular with their visible outer walls, adjoin in alignment the outer walls of the adjacent aluminum extruded profiles, so that only negligible gaps, if any, occur between the components. It is also possible for the corner elements to overlap the adjacent outer walls of-the aluminum extruded profiles, so that no gaps are visible between the components. 
         [0014]    The corner element advantageously comprises three outer walls adjoining one another, wherein projecting parts, in particular walls, protruding inwardly emanate from two of the outer walls, with which the corner element can be attached to the connector, in particular can be slid onto at least two ribs of the connector. 
         [0015]    An aluminum extruded profile advantageously comprises a hollow chamber which is subdivided into two areas by means of at least one inwardly protruding ledge-shaped wall, wherein the one first, in particular larger, area serves to receive a connector on the face side and the second area of the hollow chamber serves as a water drainage channel. The two areas are at the same time connected to one another over the entire length of the extruded profile. The water drainage channel, according to one embodiment of the invention, is connected to an area of a corner element, at least one wall section of which forms the discharge opening, so that water which has penetrated can drain out of the frame. The discharge opening here is advantageously arranged on the bottom side, which in most cases due to the arrangement of the frame also is the bottom side. 
         [0016]    The aluminum extruded profiles can comprise a channel, which is open to the rear side, for gripping around the-border of solar modules. The solar modules are hereby-gripped around from all sides and do not have to be additionally attached to the frame by fixing means. The corner elements can also comprise a corresponding reception space for the corner of a solar module, which is formed by a front wall together with a wall, which is parallel to it, and the side walls of the corner element. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]    Different possible embodiments will now be explained in more detail below with the aid of drawings. 
           [0018]      FIG. 1  shows a perspective view of a frame; 
           [0019]      FIG. 2  shows a sectional perspective illustration of an aluminum extruded profile; 
           [0020]      FIG. 2   a  shows a sectional perspective illustration of an aluminum extruded profile with a slit hollow space; 
           [0021]      FIG. 3  shows a connector; 
           [0022]      FIG. 4  shows a perspective illustration of a corner element; 
           [0023]      FIG. 4   a  shows a side view of the corner element according to  FIG. 4 ; 
           [0024]      FIGS. 4   b  show different views of the corner element according to  FIGS. 4 ; and  4   c    
           [0025]      FIG. 5  shows a top view of a corner section of a frame; 
           [0026]      FIG. 6  shows a top view of a corner section of an alternative frame. 
       
    
    
     DETAILED DESCRIPTION 
       [0027]      FIG. 1  shows the frame R according to the invention which is formed by the aluminum extruded profiles SP and the corner elements E. The corner elements E together with the extruded profiles SP form a reception space  1 ,  2  for the solar modules which are not shown in  FIG. 1 . The frame R comprises an upper side  3 ,  4  and side walls  6 ,  7 ,  8 . 
         [0028]      FIG. 2  shows a sectional perspective view of an aluminum extruded profile SP. The profile SP comprises a hollow chamber H which is subdivided into the areas H B1  and H B2  by means of the ledges  15 ,  16 . The hollow chamber H is formed by the side walls  5 ,  8 ,  11  and  12 . The area H B1  serves to receive a connector V illustrated in  FIG. 3  and comprises a height H 1  and a width B 1 , which is adapted to the width and thickness D P  of the connector V see  FIG. 3 ). The Area H B2  serves as a water drainage duct or channel. The C-shaped profile  13 , adjoining under the water drainage duct, with the inwardly directed collar-shaped walls  14  serves for attaching the frame R. Towards the upper side  3  the profile SP comprises a groove  1 , opened towards the interior  5 , which is formed by the walls  19  and  11 , wherein a solar module, which is not illustrated, lies with its one edge in the groove  1 . 
         [0029]      FIG. 2   a  shows another possible embodiment of the aluminum extruded profile SP. This hollow profile SP only differs from the one illustrated in  FIG. 2  by the wall  5  of the hollow chamber H comprising a slit  5   a.  Hence, in terms of the invention, a chamber H is also regarded as a hollow chamber., which does not only comprise face side openings. 
         [0030]    The connector V has a base body which is formed by the plates P 1  and P 2  which stand at right angles to one another and are integrally formed together, from which ribs L 1 , L 2 , L 3  extend at an angle of approx. 45°. The angle can be chosen according to the requirements. The ribs L 1  and L 2  serve to produce a contact pressure against the inner walls of the wall  8  or its projecting parts  8   v  arranged on it and protruding inwards. By pressing a leg of the connector V into the hollow space HB 1 , the ribs L 1  and L 2  are slightly bent and as a result of this produce the required pressure force, so that the connector can only be pulled out of the extruded profile SP by a very strong force and possibly by destroying the extruded profile SP and/or connector V. The connector V is also an extruded profile cut to length Lv and serves to electrically connect the extruded profiles SP connected to one another via the connector V. 
         [0031]    The connector V comprises additional ribs L 3  which serve to connect to the corner element E illustrated in  FIGS. 4 to 4   c.  On the inner corner the connector has a projecting part  23  which forms lateral stop faces  24  and  25 . When inserting the connector into the hollow chamber H of an extruded profile SP, the extruded profile SP impacts with its face side wall against the stop faces  24  and  25 . The contact surfaces  24  and  25  thus ensure that the extruded profiles SP adjoining one another exactly rest against one another with their corner edges. 
         [0032]    The connector V also advantageously comprises a recess  26  which is in particular circular, into which a screw for equipotential bonding can be screwed. This recess can also be advantageously formed during extrusion, so that no more additional time and effort required to subsequently drill an hole on the extruded profile SP or the connector V. 
         [0033]    A corner element E according to  FIG. 4  comprises three outer walls  4 ,  6 ,  7 , wherein the walls  6  and  7  form the side walls and the wall  4  forms a kind of lid. The three walls  4 ,  6  and  7  in each case are perpendicular to one another and form the outer shell of the corner element E. The corner element E comprises two inner walls  16 ,  17  to provide rigidity, which are arranged parallel to the top wall  4  and at a distance El from one another. The top wall  4  and the wall  16  form the reception space for a corner of a solar module which is not illustrated. A discharge opening  18  in the form of a recess is formed in the lower wall  17 . The wall  17  lines up precisely with the projecting parts or walls  15  of the extruded profile SP illustrated in  FIG. 2 . By means of the opening  18  and owing to the fact that the corner element is open towards the bottom side, it is therefore possible for water which is located in the hollow space H, in particular in the discharge duct HB 2 , to escape or drain away from the frame through the discharge opening  18 . Walls  19  and  20 , arranged at a 45° angle to the side walls  6  and  7 , are formed between the walls  16  and  17 . These walls  19 ,  20  with regard to their thickness are slightly thicker than the distance between the ribs L 3 , so that when sliding the corner element E on this pushes between the ribs L 3  with its walls  19 ,  20 , whereby the corner element is held securely in position by the ribs L 3 . The corner element is also held securely in position in the vertical direction, i.e. parallel to the surface normal of the frame, by the walls  16 ,  17  which abut above and below on the ribs L 1 . 
         [0034]      FIG. 4   a  shows a side view of the corner element E.  FIG. 4   b  shows a top view of the corner element E, wherein the walls  19  and  20  and the plate  16  are illustrated.  FIG. 4   c  shows a sectional view of the corner element E in the area of the walls  19 ,  20 . 
         [0035]      FIG. 5  shows a top view of a corner E of the frame R according to the invention, as it is illustrated in detail in the previously described figures. The face sides SPSt of the extruded profiles SP are cut to length at right angles (angle W 1 ) and abut on the corner element E with as few gaps as possible. The outermost corner edge E 2  is therefore formed by the corner element E. 
         [0036]      FIG. 6  shows an alternative configuration of the frame, wherein the extruded profiles SP′ are not at right angles but deflected at an angle W 2 . The corner element E′ is correspondingly shaped, so that it fills out the area between the face sides SPSt′ of the two extruded profiles, SP′ adjoining one another and also forms a corner E 2 ′ of the frame. In this embodiment also a connector can be used according to  FIG. 3  without modifications. This embodiment is only supposed to show that the corner element E′ does not have to be designed as a rectangular element. However, the corner element E, according to  FIGS. 1 to 5 , shows the preferred configuration of a corner element E, since with this shape the extruded profiles SP can be cut to length easily and simply by adhering to the right angle.