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(11) | EP 3 006 829 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A DRIVE UNIT FOR A FEEDER SUPPLYING A COMBUSTION CHAMBER OF A PELLET BURNER |
| (57) A drive unit of a worm feeder supplying the combustion chamber of a pellet burner,
being the subject of the invention, relates to a burner comprising a steel body, which
is a fixed housing with an inlet hole for pellets and a rotary combustion chamber,
equipped with a multipoint blow-in of air throughout holes and/or nozzles, to which
pellets are being dosed by the worm feeder. According to the invention the drive unit has a centrifugal fan with an internal motor and a mounting plate (6) of the housing, whereas the centrifugal fan (1) and its motor (2) are connected throughout a centring sleeve to a/the reduction gear (7). |
[0001] The subject of the invention is a drive unit for a feeder (conveyor) supplying the combustion chamber of a burner designed for burning pellets which can be used both in households and other communal facilities buildings and store or production rooms.
[0002] There are known burners designed for burning pellets which are equipped with a worm feeder supplying the combustion chamber of a burner with a dosed amount of fuel in a form of granular pellets. The feeder is driven by a motor and a reduction gear such that each of these devices is a separate element of the drive. In addition, there is a fan located in the burner housing, or outside it, which blows in into the combustion chamber a flow of air necessary for performing the combustion process. The fan is driven by a separate motor.
[0003] A drive unit of the feeder supplying a pellet burner which is the subject of the invention, relates to the burner comprising a steel body which is a fixed housing with an inlet hole for pellets, and a worm feeder driven by a drive unit, dosing pellets supplied to the combustion chamber, which is provided with a multipoint blow-in of air throughout holes and/or nozzles.
[0004] In the solution according to the invention, there is a fan used for driving a worm feeder supplying the combustion chamber of a burner, comprising a housing, a motor situated inside the housing, and a rotor with blades directed outwards, which elements, all together, form one monolith unit. The radial fan is connected with a reduction gear by a special shaft ended with a rack, adapted for transmitting drive from the fan's motor to the reduction gear where from - by the use of the driving shaft - the drive is transmitted to the worm conveyor' shaft delivering pellets to the combustion chamber.
[0005] In accordance with the invention, there is a construction element placed between the radial fan and the reduction gear in a form of a centring sleeve having an outer flange, in addition, the outer flange is fixed to a mounting plate from one side and it is tightly fitting with a seat of the reduction gear from the other side, whereas a cylinder segment of the centring sleeve passes through a hole of the monting plate and it is slidably and tightly fitted with a centrifugal fan's hole.
[0006] Thanks to the solution according to the invention, a simple design solution has been developed, improving the drive of the feeder supplying the pellets burner, in a form of one compact unit of small dimensions, which allows the drive's assembling space to be significantly limited at the evident reduction of the installing costs.
[0007] The subject of the invention is shown in an exemplary embodiment in a schematic drawing, Fig. 1 of which shows a perspective view of the driver unit of the feeder supplying the pellet burner; Fig. 2 - shows a perspective view of the reassembled details of the drive unit; Fig. 3 - shows a side view of the drive unit, and Fig. 4 - a rear view of the drive unit.
[0008] The drive unit for the feeder according to the invention, supplying the pellet burner, has been used in a pellet burner comprising a steel body (not shown in the drawing), being a fixed housing with an inlet hole for pellets and a rotary combustion chamber (also not shown in the drawing) equipped with a multipoint blow-in of air throughout holes and/or nozzles, to which doses of pellet are being delivered by a worm feeder (not shown in the drawing).
[0009] To drive the worm feeder supplying the combustion chamber of the pellet burner a centrifugal fan 1 has been used, comprising a housing not shown in the drawing, a motor 2 located inside the housing, an outer rotor 3 of a motor has blades 4 arranged on its outer circumference, and a stator 5 located inside the housing. These elements all together form one monolith unit. A rear wall of the fan's 1 housing is formed by an mounting plate 6, adapted properly to the shape of housing.
[0010] The motor 2 of the centrifugal fan 1 is connected with a reduction gear 7 by a special shaft ended with a rack (not shown in the drawing), adapted for transmitting drive from the fan's 1 motor 2 to the reduction gear 7, where from - by using a driving shaft 8 - a torque is transmitted to the shaft of the worm feeder (not shown in the drawing) supplying pellets to the combustion chamber (also not shown in the drawing).
[0011] There is a construction element placed between the centrifugal fan 1 and the reduction gear 7 in a form of centring sleeve 9a having an outer flange 9b. The outer flange 9b is removably mounted to the mounting plate 6 using bolts 10 from one side, and it is tightly fitted with a seat 11 of the reduction gear 7 from the other one, whereas a cylinder segment of the centring sleeve 9a passes throughout a hole of the mounting plate 6, and it is slidably and tightly fitted with a hole of the fan 1.
[0012] The shape of the mounting plate 6 is almost a circle-like, however this circle has an irregular contour on the length equal almost ¼ of its circumference. This shape is adapted properly to the one of the fan's housing 1 (not shown in the drawing), which looks like a shell.
List of labels
1. A drive unit of a worm conveyor supplying the combustion chamber of a pellet burner,
comprising an electric motor and a reduction gear characterised in that it has a centrifugal (radial) fan (1) with an outer motor (2) and a mounting plate (6) of the housing, whereas the centrifugal fan (1) and the motor (2) are connected throughout a centring sleeve (9a) with the reduction gear (7).
2. The drive unit according claim 1, characterised in that the mounting plate (6) has a shape adapted to the shape of the centrifugal fan's (1) housing.
3. The drive unit according claim 1, characterised in that the centring sleeve (9a) has a flange (9b) removably mounted to the mounting plate (6), and tightly fitted with a seat (11) of the reduction gear (7) from the other side.