EP3614047B1 - Patio heater - Google Patents

Description

The invention relates to a patio heater with a stable housing and at least one combustion chamber for burning biomass, in particular wood pellets, wherein the combustion chamber is designed as a replaceable burner unit, and wherein the housing has a first receiving space for the replaceable burner unit, which is designed to accommodate the replaceable burner unit . The invention also relates to a replacement system for the combustion chamber in this patio heater.

Terrace heaters of known design are mainly operated with combustible gases from pressure bottles. If the gases are of fossil origin, there is the disadvantage of a negative CO ₂ balance.

From the DE 10 2013 100 971 B4 a patio heater is known which has a firing point which is designed as a combustion chamber that can be filled with wood pellets and has a constant cross-sectional area in the vertical direction. Above the combustion chamber, a hot gas guiding device is arranged and a reflector body above it. In an upper region close to the reflector body, the combustion chamber has a flame tube with a reduced diameter compared to the combustion chamber and the hot gas guide device in order to guide the hot air generated in the combustion chamber in compressed form in the direction of the reflector body. In the area of a lower end, several primary air openings are arranged in a plane below the firing plane of the wood pellets. Furthermore, several secondary air openings are arranged in the area of the upper end in a level above the firing level of the wood pellets.

the DE 10 2013 100 972 A1 describes an apparatus for generating a column of light having a firing point for generating a flame suitable for forming a column of light. The firing point is designed as a combustion chamber that can be filled with wood pellets and has a constant cross-sectional area in the vertical direction. A substantially horizontally aligned firing plane of the wood pellets is formed between the upper end and the lower end of the combustion chamber. A flame guide is provided above the combustion chamber to guide the flame generated in the combustion chamber into the ambient air, with an air flow provided between the flame and the flame guide cooling the flame guide and shielding it from the flame and, on the other hand, forming a long flame as a column of light causes.

A patio heater patio heater for lighting, warming the environment and heating liquids is from the DE 20 2011 001 786 U1 known. The patio heater has a firing point for operation with lumpy biomass such as for example, wood pellets, which has a fuel interior, a cover with a central flame outlet opening and an overlying combustion tube. Combustion air regulation is provided between the fuel interior and an outer fuel jacket.

the DE 20 2008 007 919 U1 describes a radiant heater with a combustion chamber for firing wood pellets, which is connected to a radiant tube arranged vertically on the combustion chamber. At the end of the tube facing away from the combustion chamber, the radiant tube has a hollow roof which is open at the bottom and has the shape of a flat mushroom cap.

From the AT 516 193 B1 a furnace for outdoor use is known which has a burner for burning solid fuel, for example pellets. The cylindrically or prismatically shaped burner is mounted in a housing so that it can be adjusted in height by means of a lifting device via a spring device.

the EP 3 163 162 A1 describes a mobile radiant heater with a combustion unit for burning fuel, a radiating unit for radiating combustion heat, a storage unit designed separately from the combustion unit for storing the fuel and a transport unit for moving the entire mobile radiant heater. The units can be exchanged between different variants of the radiant heater. The housing of the radiant heater has a receiving space for the burner unit, which is designed to accommodate the burner unit in an exchangeable manner. A separate chassis for the firing unit is not provided.

the DE 23285 C relates to a fireplace with a pull-out fire basket, which is fixed on a plate that has rollers running on rails. The chimney has a casing with rings for engaging the mobile chimney section, from which a flexible pipe leads to a chimney.

the DE 20 2006 008 993 U1 describes a real-fire fireplace for domestic heating, which is surrounded by an open-front, loadable combustion chamber and has a fireplace base with a fuel container. A chimney support stand of the real fire chimney has wheels with which the entire real fire chimney can be moved like a sledge.

the CH 654 899 A5 describes a wood gas burner that can be used as pre-firing for a boiler and whose combustion chamber can be connected to the boiler via a fire mouth designed as a Venturi duct. The burner is mounted on a wheeled trolley and can be attached to a boiler or used for service and maintenance cleaning purposes are deferred. Rails are provided for the movement and precise positioning of the wood gas burner.

the WO 88/07652 A1 describes a medium reservoir with a combustion chamber and water jacket, and a counterflow heat exchanger arranged transversely to the combustion chamber. A loading basket can be pulled out of the medium reservoir together with the counterflow heat exchanger.

Biomass (wood pellets) is known to consist of combustible and non-combustible components. When wood is burned, about 80% of the amount burns in a reaction with combustion air, which produces flame and heat as process waste. The non-combustible components result in the embers, which takes a long time to burn out, i.e. cold. In this process, considerable residual heat is released into the environment.

After the burning process in a patio heater operated with wood pellets has been completed and all combustible flue gases have been burned, the burner contains the residual embers. There is a serious disadvantage here, especially in public use, compared to gas and electricity-powered outdoor radiant heaters: With the firing devices for wood pellets known from the prior art, you have to wait until the embers have completely burned out before refilling the combustion chamber. Under certain circumstances, this can take the same time as the burning time. During this time, the radiant heater cannot fully heat the area. This waiting time significantly limits the applicability and useful life of biomass fired patio heaters compared to gas or electric powered devices.

The object of the invention is to avoid these disadvantages and to increase the useful life of outdoor fireplaces operated with biomass.

According to the invention, this object is achieved in that the interchangeable burner unit is designed to be movable, the interchangeable burner unit having a chassis with at least two wheels or rollers, and the interchangeable burner unit including the combustion chamber preferably being designed as a mobile burner carriage.

This enables the replacement torch unit to be changed easily without great effort.

At the end of the burn-off process, the still hot interchangeable burner unit with the still glowing embers can be removed from the patio heater and through exchanged for a freshly filled interchangeable burner unit. The operation of the patio heater is only briefly interrupted, for example for a few minutes. The replacement burner unit freshly filled with biomass in the combustion chamber can be put into operation immediately after being exchanged in the patio heater. The fireplace can therefore develop its full heat again after a short time.

In order to enable the combustion chamber to be emptied easily, it is advantageous if the combustion chamber is detachably, preferably loosely, connected to the chassis. This enables quick removal of the combustion chamber from the chassis and easy return of the combustion chamber. In order to facilitate the manipulation of the particularly hot combustion chamber, one embodiment of the invention provides that the combustion chamber has at least one, preferably hook-like, receptacle for a manipulation device, with the manipulation device preferably having a heat protection shield. The manipulation device can be hung in the receptacles by means of finger-like U-shaped holding brackets, as a result of which the combustion chamber can be lifted with the manipulation device without risk of injury.

The interchangeable burner unit preferably has an integrated ash pan below the burner chamber, which is preferably integrated into the chassis. This can be dimensioned in such a way that the ash of several combustion cycles can be accommodated. When removing the replacement burner unit from the patio heater, all of the ash is also removed.

The removed replacement burner unit with the afterglow glow stick can slowly cool down outside of the patio heater and then be prepared for the next use by emptying the combustion chamber and the ash drawer and refilling the combustion chamber with biomass.

In an embodiment variant of the invention with at least one burner nozzle arranged above the combustion chamber—in particular one that tapers upwards—it is provided that the burner nozzle is arranged fixed to the housing in the firing point. The burner nozzle thus remains in the housing of the patio heater when the replacement burner unit is changed. As a result, the height and weight of the interchangeable burner unit can be kept as small as possible. It is particularly advantageous if a defined gap is formed between the combustion chamber and the burner nozzle when the interchangeable burner unit is retracted into the receptacle of the housing. On the one hand, the gap allows the interchangeable burner unit to be moved in and out of the patio heater without jamming and can also function as a secondary air supply opening to improve combustion.

To achieve the object, a replacement system for the combustion chamber in the patio heater with at least one replacement burner unit is provided according to the invention, with the patio heater having at least one receiving space for receiving at least one replacement burner unit.

In an embodiment variant of the invention, the exchange system additionally has a heating box and/or a heating table with at least one second accommodation space for accommodating at least one exchange burner unit.

After the burn-off process, the replacement burner unit, which is still hot, can be pulled out of the patio heater and replaced with a freshly filled replacement burner unit, which was kept cold in the warming box or in the warming table. The interchangeable burner unit, which is still hot, is moved into the receiving space of the heat box or the heat table and can glow and cool there while releasing its residual heat. The annealing process of the burned-out interchangeable burner unit still provides enough residual heat to pleasantly warm the area of the warming box or warming table. Since the burn-off process and the annealing process take about the same amount of time, the areas of the warming box or warming table can be heated over longer periods of time in continuous operation for people staying outdoors, with only short interruptions in the heat release during the exchange of the interchangeable burner units enter the warming box or warming table.

Fig. 1

einen erfindungsgemäßen Terrassenstrahler in einer ersten Ausführungsvariante in einer axonometrischen Darstellung mit eingefahrener Wechselbrennereinheit;

Fig. 2

den Terrassenstrahler im Längsschnitt;

Fig. 3

das Detail III aus Fig. 2;

Fig. 4

das Detail IV aus Fig. 2;

Fig. 5

den Terrassenstrahler in einer weiteren axonometrischen Darstellung mit ausgefahrener Wechselbrennereinheit;

Fig. 6

eine Wechselbrennereinheit in einer axonometrischen Darstellung;

Fig. 7

eine Wärmebox samt darin aufbewahrter Wechselbrennereinheit in einer Vorderansicht;

Fig. 8

einen Wärmetisch samt aufbewahrter Wechselbrennereinheit in einer Vorderansicht;

Fig. 9

einen erfindungsgemäßen Terrassenstrahler in einer zweiten Ausführungsvariante in einer axonometrischen Darstellung mit eingefahrener Wechselbrennereinheit;

Fig. 10

eine Brennkammer der Wechselbrennereinheit in einer axonometrischen Darstellung; und

Fig. 11

eine Manipulationseinrichtung für die Brennkammer in einer axonometrischen Darstellung.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the non-limiting figures. Show in it:

1

a patio heater according to the invention in a first embodiment in an axonometric representation with a retracted interchangeable burner unit;

2

the patio heater in longitudinal section;

3

detail III 2 ;

4

the detail IV 2 ;

figure 5

the patio heater in another axonometric view with the exchangeable burner unit extended;

6

an interchangeable burner unit in an axonometric representation;

7

a front view of a heat box including a replacement burner unit stored therein;

8

a front view of a heating table with a stored interchangeable burner unit;

9

a patio heater according to the invention in a second variant in an axonometric representation with a retracted interchangeable burner unit;

10

a combustion chamber of the interchangeable burner unit in an axonometric representation; and

11

a manipulation device for the combustion chamber in an axonometric representation.

1 shows a patio heater 100, which has a housing 110 in which a fireplace 1 for the outdoor area for burning wood pellets is arranged. The patio heater 100 also has a support structure 120 for a roof 200 connected to the housing 110 . Between the firing point 1 and the optional roof 200 there runs a tubular radiation body 130, the outer surface of which is surrounded by a hinged protection against accidental contact. An upper part 140 with a fine dust filter 150 and a combustion adjustment device 160 connects to the radiator body 130 at the top. Reflective mirror panels 210 and LED lighting 220 are provided in the roof 200 ( 2 and 4 ).

The heating function of a patio heater 100 is often not required. LED lighting 220 running all the way around is integrated into the roof 200 in order to integrate a multiple use. The mirror screens 210, which are also arranged circumferentially in the roof 200, are arranged in such a way that the thermal radiation emitted during the burning process and the flame light are reflected there. The angles of inclination of the mirror screens 210 are selected in such a way that the largest possible radius is radiated.

Another function of the mirror covers 210 is the exhaust gas routing. If the mushroom-shaped patio heater 100 is not heated, it can be used as an outdoor lamp thanks to the integrated LED lighting 220. In this case, the integrated mirror screens 210 reflect the light from the LED lighting 220.

If the functionality of the roof 200 is not required, it can be removed or the patio heater 100 can be designed without a roof ( 9 ).

The patio heater 100 has a housing 110, which can be at least partially insulated in order to avoid overheating and thus the risk of burns.

The patio heater 100 has an exchange system 500, with which the combustion chamber 2 can be exchanged quickly. The combustion chamber 2 is designed as a movable interchangeable burner unit 510 and has a chassis with at least two rollers or wheels 520 . Also integrated into the interchangeable burner unit 510 is an ash pan 26 to prevent soiling of the floor. The rollers or wheels 520 serve to move the interchangeable burner unit 510 alone, ie independently of the housing 110, but not to move the entire patio heater 100. The interchangeable burner unit 510 can thus be moved independently of the housing 110.

The rollers or wheels 520 of the removable burner unit 510 are provided in addition to any wheels 175 of the housing 110 . the 2 , 3 and figure 5 show an embodiment variant in which the housing 110 has its own wheels 175. When the combustion chamber 2 is removed from the housing 110, the combustion chamber 2 and the housing 110 can be moved independently of one another.

In the exemplary embodiment shown, the chassis 560 of the interchangeable burner unit 510 is designed with only two wheels 520 or rollers arranged coaxially on the same axis of rotation 520a, with the interchangeable burner unit 510 being able to be moved on the two wheels 520 or rollers like a sledge by tilting slightly. As an alternative to this, it is also possible to design the chassis 560 of the interchangeable burner unit 510 with at least three wheels or rollers, which are arranged on at least two axes of rotation spaced apart from one another. In this case, the interchangeable burner unit 510 forms a mobile burner carriage which can be rolled without tipping. In order to enable a simple change of direction when rolling, at least one axis of rotation can be steerable.

The housing 110 of the patio heater has a first receiving space 530 for receiving the interchangeable burner unit 510.

The interchangeable burner unit 510 designed to be movable has a chassis 560 with an integrated ash pan 26 on which the combustion chamber 2 is removably positioned. The interchangeable burner unit 510 including the combustion chamber 2 can be pushed into the first receiving space 530 of the housing 110 of the patio heater 100 or pulled out of it.

By means of the interchangeable burner unit 510, which can be moved by the chassis 560, it is possible, after the end of the burning process, to very quickly replace the combustion chamber 2, together with the remaining burned-off wood pellets, with a combustion chamber 2 freshly filled with wood pellets, and thus to stop the operation of the patio heater 100 after a very short interruption to continue.

Interchangeable system 500 can also have a heating box 540 for storing at least one interchangeable burner unit 510 and/or a heating table 550, with the heating box 540 or heating table 540 being designed with a corresponding second receiving space 535 for accommodating interchangeable burner unit 510 to accommodate interchangeable burner unit 510 .

The interchangeable burner unit 510 and the combustion chamber 2 are constructed in such a way that they can be placed both in the first receiving space 530 of the patio heater 100 and in the second receiving space 535 of the warming box 540 (storage box) or in a warming table 550.

The heating box 540 and the heating table 550 are designed in such a way that the embers of the interchangeable burner unit 510 accommodated in the second accommodation space 535 can burn out completely.

For example, after the burn-off process, the still hot interchangeable burner unit 510 can be moved out of the patio heater 100 and exchanged for an interchangeable burner unit 510 with a freshly filled combustion chamber 2 . The freshly filled interchangeable burner unit 510 can be stored in the second receiving space 535 of the heating box 540 or the heating table 550 until it is used.

Immediately after the exchange, the patio heater 100 can perform its full heating function again with the freshly filled "new" replacement burner unit 510, while the "old" replacement burner unit 510 removed from the patio heater 100 with the still hot combustion chamber 2 with the embers in the heating box 540 or in the heat table 550 anneals. The annealing process still provides enough residual heat for the warming box 540 or the warming table 550 to be heated sufficiently, for example to enable people to stay outdoors comfortably at low ambient temperatures.

It has been shown in practice that the active burning time in the patio heater 100 and the passive annealing time in the heating box 540 or in the heating table 550 are approximately the same, which means that the two functions can be maintained in alternating operation for as long as the user would like .

The heating box 540 and the heating table 550 can also be designed to be mobile and have different designs.

Wheels 175 can also be attached to the housing 110 of the patio heater 100 in order to allow the entire patio heater 100 to be moved easily if necessary, as can be seen from FIGS 2 , 3 , figure 5 is evident. Using the wheels 175 on the housing 110, the entire patio heater 100 with or can be moved like a sack toboggan without the interchangeable burner unit 510. If the interchangeable burner unit 510 is located in the receiving space 530, it is fixed to the housing 110 in order to enable joint movement.

In 3 and figure 5 a firing point 1 of a patio heater 100 is shown in detail in each case. The furnace 1 has a combustion chamber 2 and a burner nozzle 3 arranged above the combustion chamber 2 . The combustion chamber 2 is formed by a cylindrical first jacket 4 . The burner nozzle 3 embodied as a truncated cone is placed on the combustion chamber 2 and tapers upwards and has a minimal cross-section in a region facing away from the combustion chamber 2 . The combustion chamber 2 has a defined maximum fuel filling level 5 .

At the in 3 In the embodiment variant shown, the burner nozzle 3 is arranged fixed to the housing at a distance b--preferably without a direct connection and/or open to the atmosphere--above a combustion chamber cover plate 27 designed normal to the first jacket 4. The air gap 28 between the combustion chamber cover plate 27 and the burner nozzle 3 serves as the first secondary air opening. The burner nozzle 3, which tapers conically upwards, opens into the radiant body 130. Another advantage of the air gap 28 is that the interchangeable burner unit 510 can be moved in and out without obstacles.

At the in 3 In the embodiment shown, the air gap 28—in particular the distance b between the burner nozzle 3 and the combustion chamber cover plate 27 or the combustion chamber 2—can be changed. For this purpose, an air gap adjustment device 170 is provided, by means of which the burner nozzle 3 can be adjusted in the direction of the vertical axis 2a of the combustion chamber 2—that is, it can be raised or lowered. The adjustment range of the distance b is, for example, between 0 mm and 10 mm. The air gap adjustment device 170 can be formed, for example, by a lever device which acts on the outer jacket of the burner nozzle 3, which is mounted so that it can be displaced parallel to the vertical axis 2a, as shown in 3 is indicated. Changing the size of the air gap 28 changes the amount of secondary air flowing into the burner nozzle 3, as a result of which the length of the flame in the radiator 130 and the heat radiation associated therewith can be regulated. If the burner nozzle 3 lies directly on the combustion chamber 2 or the combustion chamber cover plate 27, the result is a long flame and intensive heat radiation. If the distance b of the air gap 28 between the burner nozzle 3 and the combustion chamber 2 is increased to, for example, 10 mm, the result is a lower flame and less radiation. Thus, the performance of the fireplace 1 or the fireplace 1 having patio heater 100 by adjusting the height of the burner nozzle 3 in a simple Way to be regulated, for example, during operation. A further regulating device is not required.

Before replacing the interchangeable burner unit 510, the burner nozzle 3 is advantageously raised so that the air gap 28 created between the burner nozzle 3 and the burner chamber 2 enables the interchangeable burner unit 510 to be moved out of or into the patio heater 100 without any obstacles.

A first group 6 of first air supply openings 7 and a second group 8 of second air supply openings 9 are arranged above the maximum fuel filling level 5, the first group 6 of e first air supply openings 7 in the cylindrical first shell 4 of the combustion chamber 2 above the maximum fuel filling level 5 and the second group 8 of second air supply openings 9 are arranged in the conical jacket 10 of the burner nozzle 3. Furthermore, the first jacket 4 of the combustion chamber 2 has in its lower region 11 near the ground a third group 12 near the ground of third air supply openings 13 which are circular in shape here. The bottom 14 is provided with third air supply openings 13 and/or designed as a grate 14a ( 3 ). The first group 6 of first air supply openings 7 arranged in the first shell 4 of the combustion chamber 2 and the third group 12 of third air supply openings 13 near the ground, also arranged in the first shell 4 of the combustion chamber 2, form primary air openings, the second group 8 arranged in the burner nozzle 3 form second air supply openings 9 form second secondary air openings. Below the floor 14 of the combustion chamber 2 there is a substructure with an integrated ash drawer 26 which is formed by the movable chassis 560 in the exemplary embodiment.

In order to allow the air to flow into the combustion chamber 2 with a swirl, swirl devices 70 are arranged in the region of the first air supply openings 7 . Analogous swirl devices 70 can also be arranged in the area of the second air supply openings 9 .

The twisting devices 70 of the first air supply openings 7 of the first group 6 and 7 are formed in the exemplary embodiments by obliquely inclined slots 7a. The slots 7a of the first group 6 of first air supply openings 7 are inclined at a first angle α to a radial plane 2b running through the vertical axis 2a of the combustion chamber 2, the angles α being approximately 30° in the exemplary embodiments. The slots 7a of the first group 6 of first air supply openings 7 are all at the same distance from the maximum fuel filling level 5 of the combustion chamber 2 . Likewise, all second air supply openings 9 of the second group 8 have the same distance to the maximum fuel filling level 5 of the combustion chamber 2 . The distance between the maximum fuel filling level 5 and the bottom 14 of the combustion chamber 2 is denoted by H. Alternative to the oblique running slots 7a, the twisting devices 70 can also be formed by obliquely arranged baffles in the area of the air supply openings 7, 9 (not shown). Adjacent slots 7a of the first group 6 of first air supply openings 7 are arranged substantially parallel to one another on a development of the first shell 4 and at a first distance a ₁ from one another. In the exemplary embodiments, the first distance a ₁ is approximately 1/10 of the minimum diameter D ₃ of the burner nozzle 3.

The diameter D ₃ of the outlet of the burner nozzle 3 is about 20% to 40% of the diameter D ₂ of the combustion chamber 2.

The height H ₁₃₀ of the radiation body 130 is at least twice the height H ₂ of the combustion chamber 2, but not more than four times the height H ₂ of the combustion chamber 2.

The diameter D ₁₃₀ of the radiation body 130 is approximately 40% to 60% of the diameter D ₂ of the combustion chamber 2.

The sum of the cross-sectional areas of all the first air supply openings 7 is dimensioned such that a combustion temperature in the range from 150° C. to 300° C. can be maintained in the combustion chamber 2 . The total cross-sectional area of all first air supply openings 7 is preferably in a defined ratio to the cross-sectional area of combustion chamber 2 , the total cross-sectional area of all first air supply openings 7 being 10% of the cross-sectional area of combustion chamber 2 , for example.

In the area 11 near the ground, the sum of all third air supply openings 13 is about 40% to 70% of the lateral surface of the combustion chamber 2 within the embers level 23.

In the area of the combustion chamber 2, the hearth 1 is multi-walled and has a cylindrical outer second shell 15, which surrounds the inner first shell 4 at a distance. At the in 3 A cavity 17a is formed between the inner first shell 4 and the outer second shell 15, which is closed at the top by a combustion chamber cover plate 27.

The combustion chamber 2 is filled, for example, with wood pellets up to the maximum fuel filling level 5 and then the fuel is ignited. After a start-up phase of around 15 minutes, for example, the combustion switches to a pure gasification mode. The flame arises directly in the area of the first group 6 at the first air supply openings 7.

The oblique arrangement of the slits 7a of the first group 6 at the first air supply openings 7 creates a swirling flow, which creates a rotating flame pattern.

During the entire combustion process, a flame with the same flame pattern is produced in the first group 6 at the first air supply openings 7, during which the fuel gasifies and thereby sinks to the ember level 23, the distance from the bottom 14 of which is denoted by h.

The normal burning time of the fireplace 1 is, for example, 2 to 3 hours. During this burning time (= gasification time), additional fuel (e.g. wood pellets, kindling wood, wood chips) can be refilled, for example by hand, through the burner nozzle 3 in order to extend the burning time. If no new fuel is supplied, the fuel automatically reaches the level 23 of embers. This results in an additional supply of primary air via the third air supply openings 13. This causes the remaining fuel to burn out essentially completely, so that no significant combustion residues remain in the combustion chamber 2. In this burnout phase, the normal flame pattern changes to blue flame. By changing the entire interchangeable burner unit 510 several times, the operation of the patio heater 100 can be continued for as long as desired.

The combustion chamber 2 is removably connected to the chassis 560 of the interchangeable burner unit 510, with the combustion chamber 2 being positioned on the chassis 560 on the underside of webs 570 for precise positioning, which can be accommodated by suitable guide slots (not shown) of the chassis 560.

In order to facilitate the handling of the combustion chamber 2 , the combustion chamber 2 of the interchangeable burner unit 510 can be lifted and removed from the chassis 560 of the interchangeable burner unit 510 by means of a manipulation device 600 . The combustion chamber 2 or combustion chamber cover plate 27 has, in the region of the upper face side, two hook-shaped receptacles 580 diametrically opposite with respect to the vertical axis 2a for fastening the manipulation device 600, as shown in FIG 10 can be seen. In the 11 The manipulation device 600 shown is equipped with finger-like holding brackets 610 which can be hooked into the hook-shaped receptacles 580 . The manipulation device 600 has an integrated heat protection shield 620 and a handle 640 on the upper side 630 with which the hot combustion chamber 2 can be safely removed if necessary can be separated and removed from the chassis 560. When the manipulation device 600 is hung on the receptacles 580, the combustion chamber 2 is completely covered by the heat protection shield 610 at the top.

Claims (7)

1. Patio radiant heater (100) having a stable housing (110) and at least one combustion chamber (2) for burning biomass, in particular wood pellets, wherein the combustion chamber (2) is designed as an interchangeable burner unit (510), and wherein the housing (110) has a first receiving space (530) for the interchangeable burner unit (510), which is designed to interchangeably accommodate the interchangeable burner unit (510), wherein the interchangeable burner unit (510) is designed to be movable, wherein the interchangeable burner unit (510) has a chassis (560) with at least two wheels (520) or rollers, and wherein preferably the interchangeable burner unit (510) together with the combustion chamber (2) are designed as a mobile burner cart.
2. Patio radiant heater (100) according to claim 1, characterised in that the interchangeable burner unit (510) has an integrated ash pan (26) below the burner chamber (2), which is preferably integrated into the chassis (560).
3. Patio radiant heater (100) according to claim 1 or 2, characterised in that the combustion chamber (2) is detachably, preferably loosely, connected to the chassis (560).
4. Patio radiant heater (100) according to one of claims 1 to 3, characterised in that the combustion chamber (2) has at least one, preferably hook-like, receptacle (580) for a manipulation device (600), wherein preferably the manipulation device (600) has a heat shield (620).
5. Patio radiant heater (100) according to one of claims 1 to 4 having at least one burner nozzle (3), in particular tapering upwards, arranged above the combustion chamber (2) characterised in that the burner nozzle (3) is arranged fixed to the housing in the combustion device.
6. Patio radiant heater (100) according to claim 5, characterised in that a defined gap (b) is formed between the combustion chamber (2) and the burner nozzle (3) when the interchangeable burner unit (510) is retracted into the first receiving space (530) of the housing (110).
7. Patio radiant heater according to one of claims 1 to 6, comprising an interchangeable system, wherein the interchangeable system comprises the interchangeable burner unit (510), wherein the interchangeable system (500) comprises the first receiving space (530) for accommodating the interchangeable burner unit (510), and wherein the interchangeable system (500) additionally comprises a heat box (540) and/or a heat table (550) with at least one second receiving space (535) for accommodating the at least one interchangeable burner unit (510).

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