EP2881661B1 - Cylinder rotating grate for a wood oven - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a cylinder rotary grate and a furnace for generating heat with a cylinder rotary grate.

BACKGROUND OF THE INVENTION

There are generally known stoves for heat generation, which are particularly suitable for the combustion of wood, such as logs or pellets. Such ovens are typically also used in living quarters, e.g. set up in the form of a stove.

Such ovens typically have a grate on which the fuel to be burned is placed, with combustion residues falling through the grate into an ash box located below the grate. In this known type of rust, a manual cleaning is required. In addition, combustion residues typically occur which do not fall through the grate, so that the grate is covered with combustion residues over time. This can make continuous operation of a furnace over a longer period of time difficult or even impossible. In addition, it is known to feed primary air through the grate from below the combustion, so that the air supply is deteriorated or even interrupted when combustion residues close the openings of the grate, is fed through the primary air.

From the patent AT 506 411 B1 and the publication DE 198 32 115 A1 It is known to provide a rotatable or tiltable grate and clean with a scraper to automatically remove combustion residues from the grate. Although such grates are able to provide automatic cleaning, but they do not allow permanent operation of a furnace, as when turning or tilting the grate and the existing ember bed is tilted. Accordingly, restarting the combustion after cleaning the grate is necessary.

From the patent AT 410 128 B is a cylindrical fire grate known for continuous ash removal. The grate has a series of deep circumferential grooves, in which a scraper engages on one side to remove burnt residues, which get stuck in the grooves. The width of the grooves is selected according to the grain size of the fuel so that the fuel can fall down through the grooves. Combustion residues that do not fall through the grooves can be removed from the top of the grate by making the grate accessible by lowering or folding up a divider wall.

Further, the patent discloses FR 1 128 822 A a cylinder rotary grate for a furnace for heat generation according to the preambles of independent claims 1 and 2. Thereafter, the known furnace comprises a cylinder rotary grate having two cylindrical grate elements. In the operating position of the furnace, the cylinder rotary grate is arranged so that the combustion residues fall through one of the two grate elements and collect inside the cylinder rotary grate. In a cleaning operation, when the furnace is out of operation, the cylinder rotating grate is rotated by about 180 °, so that the second grate elements is arranged in the region below the burner trough and the accumulated combustion residues in the interior through a wide gap in the lateral surface of the cylinder grate through fall an ash container. After emptying the cylinder rotary grate it is returned to the operating position, so that combustion residues from the combustion trough can fall again. In addition, a projection of a frame forms a sharp edge at which combustion residues are scraped off during the rotational movement.

The patent US 4,368,723 A. discloses a cylinder rotating grate for a furnace for heat generation. Thereafter, the known cylinder rotary grate comprises a cylinder element rotatably mounted about its longitudinal axis in the form of a cylindrical grate construction whose open hollow grate elements, which are provided with air outlet openings at least on one of their sides, are arranged on an endless cylinder surface. Further, there is an air intake head attached to at least one of the end faces of the grate structure. The ends of the grate elements are connected to drum plates, which are also attached to a rotary shaft. During operation of the heating system, the aforesaid grate construction is continuously rotated and the combustion material resting on the grate elements is sent to combustion in a boiler room. As the rotation of the grate construction progresses, residues of the burned fuel fall down into an ash pit below the grate structure.

Finally revealed too GB 386845 A a rotatable grate for a stove.

The object of the present invention is to provide an improved grate for a furnace for heat generation, which allows a continuous removal of combustion residues and a furnace with such a grate.

According to a first aspect, the present invention provides a cylinder rotating grate for a heat generating oven, in particular a wood burning stove such as a log burning stove or pellet stove, in accordance with independent claim 1. According to a second aspect, the present invention provides a cylinder rotating grate for a heat generating furnace, in particular a wood burning stove such as a log burning or pelletizing furnace, in accordance with independent claim 2. According to a third aspect, the present invention provides a furnace for heat generation, in particular a wood burning stove, such as a log burning stove or pellet stove, having a cylinder rotating grill according to the first and second aspects, respectively, in accordance with independent claim 12.

Further aspects and features of the present invention will become apparent from the dependent claims, the accompanying drawings and the following description of preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWING

• Fig. 1 ein erstes Ausführungsbeispiel eines Zylinderdrehrostes gemäß der vorliegenden Erfindung in einer rein schematischen Darstellung veranschaulicht;
• Fig. 2 den Zylinderdrehrost von Fig. 1 in einer Frontansicht veranschaulicht;
• Fig. 3 eine Linearbewegung entlang einer Längsachse des Zylinderdrehrosts von Fig. 1 veranschaulicht.
• Fig. 4 ein zweites Ausführungsbeispiel eines Zylinderdrehrostes gemäß der vorliegenden Erfindung in einer rein schematischen Darstellung veranschaulicht;
• Fig. 5 ein drittes Ausführungsbeispiel eines Zylinderdrehrostes gemäß der vorliegenden Erfindung in einer rein schematischen Darstellung veranschaulicht;
• Fig. 6a ein viertes Ausführungsbeispiel eines Zylinderdrehrostes gemäß der vorliegenden Erfindung in einer rein schematischen Darstellung veranschaulicht, wobei der Zylinderdrehrost in Betriebsstellung ist;
• Fig. 6b den Zylinderdrehrost von Fig. 6a nach einer 180°-Drehung des Zylinderelements des Zylinderdrehrosts zeigt; und
• Fig. 7 ein Ausführungsbeispiel eines Ofens mit einem Zylinderdrehrostes gemäß der vorliegenden Erfindung in einer rein schematischen Darstellung veranschaulicht.

Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which:

• Fig. 1 illustrates a first embodiment of a cylinder rotating grate according to the present invention in a purely schematic representation;
• Fig. 2 the cylinder rotary grate of Fig. 1 illustrated in a front view;
• Fig. 3 a linear movement along a longitudinal axis of the cylinder rotating grate of FIG. 1 illustrated.
• Fig. 4 illustrates a second embodiment of a cylinder rotating grate according to the present invention in a purely schematic representation;
• Fig. 5 illustrates a third embodiment of a cylinder rotating grate according to the present invention in a purely schematic representation;
• Fig. 6a illustrates a fourth embodiment of a cylinder rotating grate according to the present invention in a purely schematic representation, wherein the cylinder rotating grate is in the operating position;
• Fig. 6b the cylinder rotary grate of Fig. 6a after a 180 ° rotation of the cylinder element of the cylinder rotating grate shows; and
• Fig. 7 an embodiment of a furnace with a Zylinderdrehrostes according to the present invention in a purely schematic representation illustrated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the Fig. 1 to 3 a first embodiment of a cylinder rotating grate 1 according to the present invention is illustrated. Before a detailed description follows first general explanations to the embodiments and their advantages.

Some embodiments relate to a cylinder rotating grate for a furnace for heat generation, in particular a wood stove, such as a log wood stove or pellet stove.

The cylinder rotating grate comprises a cylinder element rotatably mounted about its longitudinal axis. The cylinder element may have a circular, elliptical or other cross section. In addition, the cylinder element can be configured hollow or as a solid cylinder element or partially hollow. The cylinder element can also be designed only as a sub-cylinder and can e.g. be open at the bottom, while the closed side is arranged upwards. The cylinder element may thus have a non-closed cross section, such as e.g. a semicircular cross section, a 270 ° cross section, etc.

The cylinder element has a transport surface for transporting combustion residues on. The transport surface is arranged on the outside of the cylinder element, ie it can be applied as a separate element on the cylinder element or it can also be integrally formed on the cylinder element, so that, for example, the surface of the cylinder element forms the transport surface. The transport surface is configured at least partially cylindrical jacket-shaped. It may for example have the same shape as the cylinder element itself or it may have a different shape.

The cylinder rotating grate, that is to say the cylinder element and / or the transport surface, does not have to be cylindrical throughout in the sense that the distance between the lateral surface and the longitudinal axis is equal over the entire longitudinal axis. The cylinder rotating grate, that is to say the cylinder element and / or the transport surface, can also be conical and can be made e.g. taper towards the center, so that a cross-sectional constriction forms towards the middle.

The cylinder rotating grate comprises a combustion trough, which is arranged above the transport surface, wherein between the transport surface and the combustion trough, a separation gap is set such that upon rotation of the cylinder element combustion residues from the combustion trough are transported through the separation gap. The separation gap is thus arranged so that, with appropriate rotation of the cylinder element, combustion residues are transported in the direction of the separation gap. The combustion trough may, for example, have a rectangular cross-section and comprise four walls. The combustion trough is open at the bottom, that is, at the bottom, on which the cylinder element is arranged below the combustion trough, it is open. The separation gap is formed between the transport surface and a lower edge of a wall of the combustion trough. The separation gap is set so that combustion residues, such as ash residues and slag, are passed through the transport surface of the cylinder element, while, for example, the glow bed is not guided through the separation gap, but adheres to the wall of the combustion bowl and thus remains within the combustion bowl , The separation gap thus defines a distance between the combustion trough or a wall of the combustion trough and the transport surface, for example the height of one after a certain one Combustion time expected combustion residue layer on the transport surface corresponds. This makes it possible to deliberately remove combustion residues from the combustion trough, while the ember bed remains in the combustion trough, whereby a removal of the combustion residues is possible without that while the combustion taking place in the combustion trough is interrupted. Accordingly, after removing the combustion residues by rotating the cylinder element, no new lighting of the fuel in the combustion trough is required.

The separation gap is provided in the embodiment according to the first aspect of the invention only on a wall of the combustion trough, namely on the wall, in the direction of which the transport surface transports combustion residues at a predetermined direction of rotation of the cylinder element. In some embodiments, the wall on which the separation gap between the combustion trough and the transport surface is provided, formed less high than the opposite wall.

The cylinder rotary grate also includes a scraper, which is designed and arranged so that it scrapes combustion residues from the transport surface upon rotation of the cylinder member. It happens that incineration residues, such as slag or the like, adhere to the transport surface and are not liable to fall down by gravity, e.g. fall into a collection container for combustion residues (also called ascharge), as is typically the case for ash, when the cylinder element is e.g. rotated 360 °. Such adhering to the transport surface combustion residues can be removed by the scraper.

The scraper may have a blade-shaped portion or region that is in contact with the transport surface, such that upon rotation of the cylinder member, the scraper scrapes combustion debris from the transport surface. The scraper may be fixed at a fixed distance to the transport surface or it may, for example, be subjected to a mechanical stress, so that the scraper presses with a predetermined contact pressure on the transport surface. The scraper may be mechanically biased by means of a spring or a hydraulic means.

The cylinder element may be rotatably mounted on the longitudinal axis, also called cylinder axis, for example by a shaft or the like. In addition, in some embodiments, the cylinder rotating grate may be equipped with a motor that can rotate the cylinder element accordingly. The engine can be controlled, for example, by a controller that is included in the cylinder rotary grate or the oven. The engine may be removed The combustion residue, for example, continuously turn slowly as required or he can at intervals for a
or it can rotate at intervals, for example, the cylinder element by 360 °, etc.

In some embodiments, the cylinder rotating grate includes a further scraper, which is also called the second scraper in the following. The second scraper may be arranged opposite to the (first) scraper such that the cylinder element between the (first) scraper and the second scraper is arranged. The one (e.g., first) scraper can remove combustion debris in one direction of rotation of the cylinder member, and the other (second) scraper can remove combustion debris in the opposite direction of rotation. Thus, in some embodiments, it is not necessary to rotate the cylinder member completely 360 °, but, depending on the arrangement of the wiper, e.g. half a rotation of the cylinder element sufficient to clean the area of the transport surface, which is arranged in the combustion trough and is burned on the fuel. Accordingly, e.g. the cylinder element may also be configured only as a half-cylinder or the like and / or be open at the bottom, so that the cylinder element requires less space and is inexpensive to produce, since less material is needed.

In some embodiments, the transport surface has a first and a second portion, wherein a step is arranged between the first and the second portion. In this case, e.g. the gap between the first portion and the combustion bowl is greater than the gap between the second portion and the combustion bowl. The step between the first section and the second section may be perpendicular or at another angle, e.g. 60 ° or 45 °, be formed to the transport surface. Upon rotation of the cylinder element, e.g. the combustion residues initially accumulate on the first portion of the transport surface which is farther from the firing trough than the second portion, with further rotation the combustion residues abut the stage and the first portion, together with the stage, carries the combustion residues out of the firing trough.

In the embodiments according to the first aspect of the invention comprises the cylinder rotary grate for a furnace for heat generation, in particular a wood stove, such as a log or pellet stove, a rotatably mounted about its longitudinal axis cylinder member and a transport surface for transporting combustion residues on the cylinder element is arranged, wherein the transport surface is at least partially designed like a cylinder jacket, as has already been explained above.

The cylinder rotary grate comprises in the embodiments according to the second aspect of the invention, a combustion trough, which is arranged above the transport surface, wherein between the transport surface and the fuel trough a distance is provided and the transport surface is formed eccentrically to the longitudinal axis of the cylinder member, so that the distance between the transport surface and Brennmulde changed by rotation of the cylinder member and thereby a minimum gap and a maximum gap between the firing tray and the transport surface is adjustable.

The maximum gap is designed so that it lets out combustion residues from the combustion trough when the transport surface rotates, but, as explained above, the ember bed essentially remains in the combustion trough. The change between maximum and minimum gap serves to transport combustion residues in the direction of rotation of the cylinder element and to transport accordingly out of the combustion trough out.

In such embodiments with eccentric transport surface, the edge of the combustion trough can be designed as a wiper for stripping combustion residues from the transport surface. In this case, e.g. the minimum gap must be provided so that the edge of the firing trough has contact with the transport surface or the gap is so small that adhesive combustion residues can be removed, as has already been described above for a wiper. The edge of the combustion bowl may also have a blade-shaped portion or the like.

In such embodiments with eccentric transport surface of the cylinder rotary grate may additionally comprise a scraper, which is designed and arranged so that it scrapes combustion residues from the transport surface upon rotation of the cylinder member, as already explained above.

Generally, in some embodiments, the transport surface may include air openings. As a result, primary air can be guided through the transport surface into the combustion trough. In addition, as already indicated above, in some embodiments, the cylinder member having a primary air connection, the primary air, for example. Through a cavity in the cylinder element through the air openings leads.

In some embodiments, a shaft on which the cylinder member is rotatably mounted, may be formed as a hollow shaft, which also forms a primary air supply at the same time and, for example. Primary air through the air openings in the transport surface leads.

In some embodiments, the transport surface may also have a structure for transporting the combustion residues. The structure may be configured as elevations, e.g. as nubs, tips, or the like. In such embodiments, the scraper and / or the combustion trough may have negative recesses, so that upon rotation of the cylinder member, the elements of the structure does not abut against the wall of the combustion trough, or so that the wiper makes good contact with the transport surface and the combustion residues also from the Stripping structural elements and between the structural elements.

The structure may also be formed spirally or helically with a slope and thereby support the transport of the combustion residues in the direction of rotation of the cylinder member. The spiral or helical structure may also cause a transport of combustion residues in the longitudinal direction of the transport surface, i. a transport along the slope of the structure. In this case, an outlet opening may also be provided on an end face of the firing trough, so that there the combustion residues exit and, for example, can be cleaned off the transport surface by means of a brush or a differently designed wiper.

The cylinder element can also be displaceable along its longitudinal axis. Thereby, e.g. a shaking movement is performed, the combustion remains evenly distributed on the transport surface, e.g. before the cylinder element is rotated to remove the combustion residues from the combustion trough.

Some embodiments relate to a furnace for heat generation, in particular wood burning stove, such as log burning stove or pellet stove. The furnace includes a combustion chamber in which fuel such as logs or pellets or other biomass-based fuel is burned.

Further, the furnace comprises a cylinder rotating grate, as described above, wherein the combustion trough is arranged in the combustion chamber. In addition, the oven includes a collecting container for combustion residues, wherein the cylinder rotating grate is arranged above the collecting container, so that combustion residues are transported out by rotating the cylinder member through the transport surface from the combustion trough and fall from the transport surface by gravity into the collecting container. Both combustion residues can fall into the collecting container, which lie loosely on the transport surface, as well as those that are, for example, stripped by a scraper from the transport surface.

The furnace may also have an automatic fuel supply, as e.g. for pellet stoves is known, so that fuel can be automatically routed for combustion in the firing tray.

In some embodiments, as already indicated above, the furnace or cylinder rotating grate comprises a controller adapted to drive, e.g. having an electric motor for controlling the cylinder element. The control can, for example, control the drive in such a way that the cylinder element is driven continuously and thus continuously removes combustion residues from the combustion trough. However, the drive can also be controlled so that the cylinder element at time intervals, that is, after a predetermined period of time, drives the cylinder member and rotates by a predetermined angular amount. Depending on the variant embodiment, the cylinder element can thereby execute a complete 360 ° rotation or cover only a partial angle range, e.g. 45 °, 60 °, 90 °, etc. In some embodiments, the cylinder member may also be rotated forward and backward by a certain angle of rotation, e.g. in the embodiment described above with two stripping makes sense. Additionally, in some embodiments, the controller may be configured to move the cylinder member along its longitudinal direction, as discussed above. The drive can be designed to also perform the linear movement in addition to the rotational movement or it is provided according to a linear drive.

Coming back to the Fig. 1 to 3 There is shown a first embodiment of a cylinder rotating grate 1 in a three-dimensional view. Hereinafter, like reference numerals are used for like elements and like reference numerals, which differ only by a dash, are used for similar elements, so that embodiments for such elements made in connection with an embodiment are analogous to the same or similar element in a other embodiment apply.

The cylinder rotating grate has a cylinder element 2 with a transport surface 3, which is formed as a surface of the cylinder element 2. Above the cylinder element 2, and thus also above the transport surface 3 formed as the surface of the cylinder element 2, there is arranged a combustion trough 4, in which fuel, such as e.g. Logs or pellets can be filled for combustion.

The combustion trough 4 is open at the bottom, so that fuel directly rests on the transport surface 3, which is accessible in the operating state of the cylinder rotating grate 1 in the lower opening of the combustion trough 4. The combustion trough 4 has four walls and has a similar longitudinal extent as the cylinder element 2 and the transport surface 3. The combustion trough 4 has two longer opposite walls 10 and 11 and two shorter end walls 15 and 16. The end walls 15 and 16 are respectively at the bottom cut out so circular that they follow the circular cylinder jacket-shaped surface partially, so that the distance between the end walls 15 and 16 of the combustion trough 4 to the transport surface 3 is low and, for example Embers and / or combustion residues and fuel does not fall through the gap between the transport surface 3 and the respective end wall 15 and 16.

The longer walls 11 and 10, however, are each formed straight at the lower edge, wherein the in Fig. 2 shown left side wall 11 is higher than the right side wall 10. The left side wall 11 is located just above the transport surface 3, so that by the resulting gap 12 no combustion residues, embers or fuel parts can fall. The right side wall 10, which in Fig. 2 is arranged to the right of the longitudinal axis of the cylinder member 2, is shortened such that a predetermined Abscheidespalt 5 between the transport surface 3 and the lower edge of the right side wall 10 is fixed.

As in Fig. 2 is shown in the view shown, the direction of rotation of the cylinder member 2 in a clockwise direction, so that combustion residues that are in the combustion trough 4 on the transport surface 3 of the cylinder member 2 are pushed upon rotation of the cylinder member 2 in a clockwise direction in the direction of the Abscheidespalts 5 and further Rotation can be pushed through him. Combustion residues which do not adhere or stick to the transport surface 3 fall down from the transport surface 3 due to the gravitational force acting on them.

The cylinder element 2 is internally provided with a cavity 9 and is mounted via a shaft 7, which is designed as a hollow shaft and can be supplied via the primary air, which are guided through holes 13 in the transport surface 3 of the cylinder member 2 from below into the combustion trough 4 can. The shaft 9 is connected via struts 8 (or full surface) with the lateral surface of the hollow cylindrical cylinder element 2 and thereby secured.

A scraper 6 is arranged on the opposite side of the Abscheidespalts 5 on the circumference of the cylinder element 2. The scraper 6 has a blade-shaped end portion 6a, whose sharp edge is arranged at a small distance from the transport surface 3, so that the sharp edge scrape combustion residues adhering to the transport surface 3, when the transport surface 3 by rotation of the cylinder member 2 along her moves.

In the present embodiment, the scraper 6 is mounted in a fixed position. As stated above, however, the wiper 6 can also be made e.g. be acted upon by a spring and press with a predetermined contact pressure on the transport surface 3.

In addition, the cylinder element 2 can still be displaced in the longitudinal direction, as it is also by the in Fig. 3 illustrated double arrow is illustrated. As a result, the cylinder element 2 can perform a vibrating motion through which combustion residues, which lie in the combustion trough 4 on the transport surface 3, are distributed on the transport surface 3, before they are pushed out through the separation gap 5 by rotation of the cylinder element 2.

A second embodiment of a cylinder rotary grate 1 'is in Fig. 4 illustrated. The cylinder rotating grate 1 'has two scrapers a first scraper 6 (left side) with a blade-shaped end portion 6a and opposite a second scraper 6' (right side), which has a blade-shaped end portion 6a '. The cylinder element 2 'is provided below with a cutout 17 and has a cavity 9'.

The cylinder element 2 ', as indicated by the arrows, rotatable clockwise and counterclockwise, so depending on the direction of rotation of the left scraper 6 or the right scraper 6' combustion residues from the transport surface 3 'of the cylinder element 2 'strips.

The remaining elements of the cylinder rotating grate 1 'correspond to those of the first embodiment. The cylinder rotating grate 1 'has a combustion trough 4, which is arranged above the cylinder element 2', so that the side walls 11 and 10 are arranged at a small distance 12 or with the deposition gap 5 above the transport surface 3, as described in detail above ,

By rotation of the cylinder element 2 'counterclockwise combustion residues, glowing parts or fuel parts against the in Fig. 4 left side wall 11 is pressed, while in a clockwise rotation combustion residues are passed through the Abscheidespalt 5 to the outside and fall by gravity on the scraper 6 '. The left 6 and the right 6 'scrapers are not horizontally arranged, but at an angle obliquely downward, so that combustion residues that fall on the top of the left 6 or right 6' scraper slip down on the top and from there on, for example, in a Aschelade fall. The separation gap 5 can also be arranged on both sides, so that combustion residues are conducted to the outside in both directions of rotation.

A third embodiment of a cylinder rotating grate 1 "is in Fig. 5 illustrated. Here, the transporting surface 3 "of the cylindrical member 2" is formed so that two steps 14a and 14b are respectively formed at a junction between a first conveying surface portion 3a "and a second conveying surface portion 3b".

The first transport surface section 3a "is farther from the longitudinal axis of the cylinder element 2" and thus closer to the firing trough 4, while the second transport surface section 3b "is closer to the longitudinal axis and therefore further away from the firing trough 4.

The combustion trough 4 is designed exactly as it has already been explained in connection with the first embodiment. Depending on the position of the cylinder element 2 ", the separation gap 5, which is defined as described above between the right side wall 10 of the combustion trough 4 and the transport surface 3", and the gap 12, as described above, between the left side wall 11 and the transport surface 3 "is formed, vary.

At the operating position in Fig. 5 , the first conveying surface section 3a "is at the top arranged so that it forms the bottom of the combustion trough 4. In this position, the configuration corresponds to that of Fig. 1 since here the gap 12 is small and the separation gap 5 is designed essentially as it is also the case in the first embodiment, that is, it is dimensioned so that the combustion residues are transported out in a clockwise direction upon rotation of the cylinder element 2 ", while the ember remains in the combustion trough 4. The wiper 6 is arranged here so that it can strip off the combustion residues on the first transport surface section 3a "since no adhering combustion residues are to be expected on the second transport surface section 3b" since the combustion substantially occurs the first transport surface portion 3a "takes place and the ember comes into contact with the second transport surface portion 3b" for a short time only when rotating the cylinder member 2 "by 360 °.

Upon rotation of the cylinder element 2 "in the clockwise direction, the stage 14a comes into the region of the combustion trough 4, so that the material in the combustion trough 4, ie combustion residues, embers and fuel after passing through the step 14a on the second transport surface portion 3b" fall through him and be entrained by rotation of the cylinder member 2 and are transported by the now increased by the height difference between the first 3a "and second 3b" transport surface portion Abscheidespalt 5 from the combustion trough 4.

After another half turn, ie after a total of approximately three quarters of a revolution of the cylinder element 2 ", the second step 14b enters the region of the combustion trough 4 and pushes combustion residues which lie on the second transport surface section 3b" before it and out of the enlarged separation gap 5 out of the combustion trough 4 out.

Thus, it is possible in total, in contrast to the first embodiment, to transport a larger amount of combustion residues from the combustion trough 4 through the separation gap 5 out.

The cylinder element 2 "has a cavity 9" and a shaft 7 which is fastened via struts 8 "(or over the entire surface) to the lateral surface of the cylinder element 2". The struts 8 "are of different lengths since the first transport surface section 3a" is farther from the central axis than the second transport surface section 3b "and consequently the struts 8" leading from the shaft 7 to the first transport surface section 3a " longer than struts 8 ", which lead to the second transport surface portion 3b".

The two steps 14a and 14b are arranged in the present embodiment such that the first transport surface section 3a "occupies a larger surface area of the entire transport surface 3" than the second transport surface section 3b ". In other embodiments, the first 3a" and second 3b " Transport surface portion be the same size or it is the second 3b "larger than the first 3a".

A fourth embodiment of a cylinder rotating grate 1 '"is in the Fig. 6a and 6b Here, the transporting surface 3 '"is designed eccentrically and wherein no scraper is provided., From the effect of the discharge of combustion residues from the combustion trough 4, the cylinder rotating grate 1'" is similar to that of the third embodiment.

In contrast to the previous embodiments of the Fig. 1 to 5 here are the left 11 '"and right 10"' side wall of the combustion trough 4 '"configured the same height.

Due to the eccentricity of the transport surface 3 '"there is a position of the cylinder element 2'" with a minimum distance 12 '"between the transport surface 3'" and the lower edge of the combustion trough 4 '"( Fig. 6a ) and a position with maximum distance 5 '"between the transport surface 3'" and the lower edge of the combustion trough 4 '"( Fig. 6b ).

The minimum distance position 12 '' 'is the operating position in which combustion takes place on the area of the transport surface 3' '' located in the combustion trough 4 '' ', here the minimum distance 12' '' is between the two side walls 11 '"and 10'" present and set so that no combustion residues, Glutteile or fuel particles fall through.

Upon rotation of the cylinder member 2 '"clockwise increases due to the eccentric configuration of the transport surface 3'" the distance between the lower edge of the combustion trough 4 '"and the transport surface 3'", until finally after half a turn, the transport surface 3 '"maximum is removed from the lower edge of the combustion trough 4 '"and thus determines the maximum distance 5'" or Abscheidspalt.

By the rotation of the cylinder element 2 '"with the transport surface 3'" combustion residues on the transport surface 3 '"and moved by the increasing with the rotation distance between the transport surface 3'" and the lower edge of the combustion trough 4 '"from the combustion trough 4 '"transported out. After completion of a complete revolution is again the minimum distance 12 '"set and the operating position is reached.

The cylinder element 2 '"is provided with a cavity 9'" and a shaft 7 is arranged off-center (eccentric) and with struts 8 '"(or full surface) on the lateral surface of the cylinder element 2'" attached.

As stated above, an edge of a sidewall, e.g. the lower edge of the left side wall 11, be designed as a scraper. In addition, a separate wiper, such as e.g. the scraper 6 of the first embodiment or even two scrapers 6, 6 ', as in the second embodiment, be provided. The scraper can be designed so that it follows the eccentrically formed transport surface 3 '"upon rotation of the cylinder member 2'". For this purpose, the scraper may be displaced and tensioned with a spring.

Fig. 7 schematically illustrates a wood oven 20 with a combustion chamber 21, in which, by way of example, the cylinder rotary grate 1 of the first embodiment is arranged. The combustion trough 4 is arranged in the combustion chamber 21 and below the cylinder rotary grate 1, an ash tray 22 is arranged.

A primary air supply 23 is coupled to the hollow shaft 7 of the cylinder rotating grate 1 and carries primary air through the cylinder element 2 in the combustion trough 4, as in the context of the above with the first embodiment of the Fig. 1 to 3 was explained. A flue gas outlet 24 is arranged above the combustion chamber 21.

During operation of the wood oven 20, wood is consequently introduced into the combustion trough 4 and combustion commences. Primary air flows through the primary air connection 23 through the cylinder element 2 into the combustion trough 4 and supplies the combustion with oxygen. After a predetermined firing time, the cylinder element 2 is rotated by a drive (not shown) for a defined period of time and thereby removes the lower combustion layers (combustion residues) from the combustion trough 4, which fall into the ashtray 22, wherein the wiper 6 on the transport surface 3 of the cylinder element 2 abhesive adhesive combustion residues, which also fall into the ash 22. The upper unburned combustion layers (ember bed) remain in the combustion trough 4, whereby a removal of combustion residues from the combustion trough 4 is possible without interrupting the combustion. Due to the rotation of the cylinder element and the upper unburned combustion layers (ember bed) are loosened, whereby a slagging (especially with poor fuel quality) is additionally counteracted.

Claims (12)

1. Cylinder rotating grate for a stove for generating heat, in particular a wood-burning stove such as a log-burning stove or pellet stove, comprising:

   a cylinder element (2, 2', 2") mounted so as to be rotatable about its longitudinal axis,

   a transport surface (3, 3', 3") for transporting combustion residues, which is arranged on the cylinder element (2, 2', 2"), wherein the transport surface (3, 3', 3") is configured at least partially in the form of a cylinder barrel,

   a scraper (6, 6'), which is designed and arranged such that it scrapes combustion residues off the transport surface (3'") upon rotation of the cylinder element (2, 2', 2"), and

   a fire pan (4), which is arranged above the transport surface (3, 3', 3") and into which fuel for combustion can be filled,

   wherein a space is provided between the transport surface (3, 3', 3") and the fire pan (4),

   and wherein a predetermined separation gap (5) is provided between the transport surface (3, 3', 3") and the lower rim of a first side wall (10) of the fire pan (4), in the direction of which the transport surface (3, 3', 3") transports combustion residues with a predetermined direction of rotation of the cylinder element (2, 2', 2"), such that, upon rotation of the cylinder element (2, 2', 2"), combustion residues are transported out of the fire pan (4) through the separation gap (5), while the firebed remains substantially in the fire pan,

   and wherein a gap (12) that arises above the transport surface (3) as a result of the arrangement of an opposite second side wall (11) of the fire pan (4) is provided, such that no combustion residues, embers or fuel parts can fall through the gap (12),

   and wherein the separation gap (5) is larger than the gap (12).
2. Cylinder rotating grate for a stove for generating heat, in particular a wood-burning stove such as a log-burning stove or pellet stove, comprising:

   a cylinder element (2'") mounted so as to be rotatable about its longitudinal axis,

   a transport surface (3'") for transporting combustion residues, which is arranged on the cylinder element (2'"), wherein the transport surface (3'") is configured in the form of a cylinder barrel,

   a fire pan (4'"), which is arranged above the transport surface (3, 3', 3") and into which fuel for combustion can be filled,

   wherein a space is provided between the transport surface (3'") and the fire pan, and the transport surface (3'") is formed eccentrically with respect to the longitudinal axis of the cylinder element (2'") such that the space changes size as a result of rotation of the cylinder element (2'") and, as a result, a minimum gap (12'") and a maximum gap (5'") are settable between the fire pan (4'") and the transport surface (3'"), wherein the maximum gap (5'") is fixed such that, upon rotation of the cylinder element (2"), combustion residues are transported out of the fire pan (4) through the gap (5'"), while the firebed remains substantially in the fire pan (4'").
3. Cylinder rotating grate according to Claim 1, wherein the scraper (6, 6') has a blade-like region (6a, 6a').
4. Cylinder rotating grate according to either of Claims 1 and 3, also comprising a second scraper (6'), which is arranged opposite the scraper (6) such that the cylinder element (2, 2', 2") is arranged between the scraper (6) and the second scraper (6').
5. Cylinder rotating grate according to one of Claims 1 or 3 and 4, wherein the transport surface (3") has a first (3a") and a second (3b") portion, wherein a step (14a, 14b) is arranged between the first (3a") and the second (3b") portion.
6. Cylinder rotating grate according to Claim 2, wherein an edge of the fire pan (4'") is in the form of a scraper for scraping combustion residues off the transport surface (3'").
7. Cylinder rotating grate according to either of Claims 2 and 6, additionally comprising a scraper that is designed and arranged such that it scrapes combustion residues off the transport surface (3'") upon rotation of the cylinder element (2'").
8. Cylinder rotating grate according to one of the preceding claims, wherein the transport surface (3) has air openings (13).
9. Cylinder rotating grate according to one of the preceding claims, wherein the transport surface has a structure for transporting combustion residues.
10. Cylinder rotating grate according to one of the preceding claims, wherein the cylinder element (2) is displaceable along its longitudinal axis.
11. Cylinder rotating grate according to one of the preceding claims, wherein the cylinder element (2) has a primary air port for feeding primary air.
12. Stove for generating heat, in particular a wood-burning stove such as a log-burning stove or pellet stove, comprising:

    a combustion chamber (21),

    a cylinder rotating grate (1, 1', 1", 1'") according to one of the preceding claims, and

    a collecting vessel (22) for combustion residues, wherein the cylinder rotating grate (1, 1', 1", 1"') is arranged above the collecting vessel (22) such that combustion residues are transported out of the fire pan (4, 4") by the transport surface (3, 3, 3", 3'") as a result of the cylinder element (2, 2', 2", 2'") being rotated, and falling from the transport surface (3, 3', 3", 3'") into the collecting vessel (22) by gravity.

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