Existing structures on the market today use different types of solutions for feeding means located in the bottom of fuel storages in order to remove said fuel from the fuel storage by one or several feeding openings via a bottom section in thte form of e. g. a channel to the feed gear. The problem is to take out the fuel without its clogging in the feed gear and around the same in the bottom section. The weight of the fuel from above pushes the fuel downwards, which in turn is pressing against said feed gear, when the fuel moves through said feeding opening, so that the bottom section and feed gear are filled with fuel between flanges of said feed gear. When the feed gear rotates, it transports the fuel along its whole length and up to an opening at e. g. a burner. When the feed gear rotates fuel is transported out from the container through the feeding opening, the feed gear located farest away from the opening at first being emptied, so that fresh fuel moves downwards at that place. The nearer the opening the fuel comes, the harder the fuel is pressed together in said feed gear.

It will be worst towards that part of the feed gear, which is located closest to said opening.

Since the feed gear cannot receive more fuel on places, where it is filled up, hard solid particles are created around and in the feed gear. This creates friction, which cruch the fuel so that it will be too fine and will be packed together in creating"arcs"not wanted. Too fine fuel will in this case be transported to the burner, so that the efficiency will decrease in the burner. The large friction means too much wear on said feed gear and the mechanism and motor driving the same, so that large maintenance and energy costs must be taken in order to repair and drive the feed gears, mechanism and motors. In order to limit the friction in some embodiment examples the content of the fuel storage is delimited, which results in that fuel storage over 10 m is not used. In providing a number of shorter feed gears, which work towards one opening, efforts have been made in order to unload the pressure against the feed gears. Another way to solve these problems is to empty the fuel storage by aid of a number of smaller feed openings over the feed gear. These structures do not solve the problem satisfactory, since the problems still exist in a too large extent. These structures for solving the problems are further too expensive and require employees, which observe the fuel storage during its functioning. Attempts have also been made to portion the amount of fuel in suitably large amounts in different places on the feed gear having different conveying belts. This is expensive and technically complicated to provide and to manufacture and to take care of One object of the present invention is to solve those problems existing in the above mentioned structures by allowing the fuel to be fed through a feeding opening by aid of a discharging roof, which totally or partly covers and discharges the feed gear in its longitudinal direction and that the feed gear rotates towards the fuel falling down, so that the friction from the fuel in the feed gear decreases.

Thanks to the present invention a feeding means has been provided, which can empty the fuel from thte fuel storage through the feeding opening into the feed gear in the bottom and further into the opening at e. g. a burner but without having the fuel to clogg, so that friction does not start in and around the same in a greater extent. According to the invention the fuel storage, in which the fuel is stored, comprises surrounding vertical walls. Nearer the bottom in said fuel storage at least one of the walls is inclined towards to the feed gear in order to create a slope towards the feed gear, so that the fuel can flow downwards to the feeding opening along the wall in a suitable speed. This wall extends further beside and below the feed gear mainly along its whole length. The feed gear is from above partly covered of a discharging roof, which also is inclined with a sloping angle, which does not hardly is below about 40° against the feed gear, what concerns pellets. The discharging roof is located in opposite side of the sloping wall, so that the discharging roof and the sloping wall together are directing the fuel towards the feeding opening in the bottom of the fuel storage. The discharging roof is ended by an outer edge in a distance form the sloping wall. Then a gap is formed above the upper part of the feed gear, which constitutes the feeding opening. The same expands thus over and above the feed gear mainly at the side of the turning shaft of the feed gear in a view seen straight from above mainly in a horizontal direction, so that the fuel can flow through the feeding opening downwards to the one long side of the feed gear and mainly on the one side about the turning shaft in a view seen straigth from above. The discharging roof discharges the feed gear from a direct load owing to the weight of the fuel, since it covers the whole or parts of the feed gear, the friction from the fuel being decreased very much. In letting the feed gear rotate in one and the same rotating direction towards the fuel falling down instead of in the same direction, the feed gear is not filled with so much fuel. One side of the feed gear is in fact covered for fuel flowing down, which makes that the other longside rotates against and lifts this fuel, which thereafter is fed furher in a suitable amount outwards into the opening in the bottom section, which surrounds the feed gear below the same. The bottom section is formed as an elongated channel or box towards the opening. The form of the bottom section in a section can be square, triangular, round or combinations of these forms. In a preferable embodi- ment example of the invention the feed gear is arranged 1 to 10 mm from the sloping wall along the whole length of the feed gear. Then also the outer edge is located in such a way that the width of the gap is between 20 and 80 mm. This measure can, since the whole discharging roof and/or the outer edge as a separate part, be adjusted in its position towards and away from the sloping wall, depending on what kind of fuel of different corn sizes, which shall pass througt said gap, so that also the right amount of fuel per time unit is passing. Further, according to the present invention the sloping angle of the discharging roof can be adjusted in providing discharging supports and a supporting structure, which influences the sloping angle and which is driven pneumatically or in another way. This is preferable in order to adapt different sloping angles to different corn sizes in different types of fuels. A turning shaft located at the feed gear can further be movable, so that the whole feed gear can be moved from its position, whereby fuel flowing down in the best way can be urged to flow downwards to the one longside of the feed gear, the fuel being in the best way fed towards the rotating direction. Since a suitable volume of fuel all the time is fed towards the feed gear the pressure will be less, the friction less and the wear less. The best advantages with the invention will thus be that the fuel can be fed from the fuel storage through the bottom section to the opening and for example to a burner without creating an amount of fine granular fuel, which decreases the efficiency in the burner. The wear on mechanism and motors decreases and therefore also energy-, operation-, and maintenance charges. The fuel storages can further be made much bigger, so that they can store a larger volume of fuel without increasing the friction. Cheeper, weaker motors can be used, since less force is needed to run the same.

The invention will now be described in more detail below with help of some preferred embodiment examples with reference to the accompanying drawings, on which Figure 1 shows a translucent perspective view of a fuel storage, Figure 2 shows a vertical section through a fuel storage and Figure 3 shows a vertical section through a part of a fuel storage at and around a feed gear.

As can be seen from fig. 1 and 2, here is shown a fuel storage 1, where the fuel 3 is stored and where it is transported further on through a feeding opening 5, which extends mainly in a horizontal direction to a feed gear 6, which also extends mainly horizontally in a bottom 13 of a bottom section 4, which is formed as a longitudinal channel and further to an opening 2. The fuel storage 1 comprises surrounding walls 8. A sloping wall 15, which is a part of the wall 8, extends at the side of and under the feed gear 6. A discharging roof 12 extends over the feed gear 6 in a sloping angle 14. The discharging roof 12 comprises an outer edge 24 in a distance 19 from the sloping wall 15, and creates a gap 9 having a width 10, which forms the feeding opening 5. The feed gear 6 comprises a turning shaft 7.

The one longside 17 of the feed gear 6 consists of one side of said turning shaft 7 seen in a view from above. The feed gear 6 rotates in a rotating direction 18. The discharging roof 12 is supported by supporting rods 20 and a supporting structure 25, which can influence the sloping angle 14.

As can be seen from fig. 3 here is illustrated how the feed gear 6, which is arranged in the bottom section 4, rotates in its rotating direction 18 around its turning shaft 7. The fuel 1 flows downwards by its own weight through the gap 9 and through the feeding opening 5 from the sloping wall 15 and the discharging roof 12 and meets the feed gear 6 at its upper part 22 along one of its long sides 17. The feed gear 6 comprises flanges 16, which are formed in a screw formation around the turning shaft 7, so that the fuel 1 during the rotation in the rotating direction 18 is transported in a feeding direction 11 according to fig.

1. The feed gear 6 comprises a best distance 21 in the bottom section 4 from the sloping wall 15, which is from 1 to 10 mm along the whole length of the feed gear 6. In this case the width 10 of the gap 9 is between 20 to 80 mm. The fuel 1 cannot in this case never in a correct way flow downwards through the best distance 12, since this distance is so small and that the rotating direction 18 is towards the flowing direction 23, which makes that the fuel 1 insted follows together with the rotating direction 18 and downwards to the other side of the feed gear 6 in a suitable measured amount, so that no wedges and friction can occur in a greater extent.