Electric cooking appliance comprising a hot air cooking system equipped with a movable heating device

Abstract

An electric cooking appliance (1) comprises a housing (3), a cooking vessel (5) configured to receive food to be cooked, a lid (8), and a hot air cooking system (10) configured to generate a flow of hot air over food received in the cooking vessel (5). The hot air cooking system (10) comprises a fan (11) mechanically connected to the lid (8) and configured to generate a flow of air over food received in the cooking vessel (5), a drive unit (12) configured to rotate the fan (11), and a heater (13) mechanically connected to the lid (8) and configured to heat the flow of air generated by the fan (11). The electric cooking appliance (1) further comprises a control unit (2) configured to control the operation of the electric cooking appliance (1) according to a hot air cooking mode. Figure 1

Description

Title of the invention: Electric cooking appliance comprising a hot air cooking system equipped with a movable heating device Technical field

[0001] The present invention generally relates to a food preparation appliance for cooking food according to at least one hot air cooking mode, such as an electric pressure cooker. State of the art

[0002] It is known from the prior art to use an electric cooking appliance comprising:

[0003] - a housing comprising a receiving housing,

[0004] - a cooking tank configured to be arranged in the receiving housing and to receive food to be cooked,

[0005] - a cover configured to occupy a closed position in which the cover preventing access to the cooking tank and an open position in which the cover allows access to the cooking tank, the cover comprising a lower wall which extends substantially opposite the cooking tank when the cover is in the closed position,

[0006] - a hot air cooking system configured to generate a flow of hot air over food received in the cooking tank, the hot air cooking system comprising a fan mechanically connected to the lid and configured to generate an airflow over food received in the cooking tank, a drive unit configured to rotate the fan about an axis of rotation, and a heating device mechanically connected to the lid and configured to heat the airflow generated by the fan, and

[0007] - a control unit configured to control the operation of the electric cooking appliance according to at least one hot air cooking mode.

[0008] This type of electric cooking appliance is particularly efficient because it allows a user to cook food to be cooked in the cooking tank using a hot air cooking mode, the hot air being generated by the rotation of the fan simultaneously with the operation of the heating device.

[0009] However, a disadvantage of such an electric cooking appliance lies in the difficulty of cleaning the hot air cooking system, and more particularly the fan. Indeed, cooking food, in general, leads to the production of steam or particles which can be deposited in particular on the fan blades. Summary of the invention

[0010] The technical problem underlying the invention therefore consists of providing an electric cooking appliance with a simple, compact and economical structure, while allowing easy and optimal cleaning of a fan equipping the hot air cooking system of such a cooking appliance.

[0011] To this end, the present invention relates to an electric cooking appliance comprising:

[0012] - a housing comprising a receiving housing,

[0013] - a cooking tank configured to be arranged in the receiving housing and to receive food to be cooked,

[0014] - a cover configured to occupy a closed position in which the cover preventing access to the cooking tank and an open position in which the cover allows access to the cooking tank, the cover comprising a lower wall which extends substantially opposite the cooking tank when the cover is in the closed position,

[0015] - a hot air cooking system configured to generate a flow of hot air over food received in the cooking tank, the hot air cooking system comprising a fan mechanically connected to the lid and configured to generate an airflow over food received in the cooking tank, a drive unit configured to rotate the fan about an axis of rotation and a heating device mechanically connected to the lid and configured to heat the airflow generated by the fan, and

[0016] - a control unit configured to control the operation of the electric cooking appliance according to at least one hot air cooking mode,

[0017] the heating device being mounted movably relative to the cover between an operational configuration in which the heating device is moved closer to the fan and a cleaning configuration in which the heating device is moved away from the fan and is configured to allow free access to the fan.

[0018] Such a configuration of the electric cooking appliance makes it possible to modify the position of the heating device, and therefore to create a clearance allowing easy access to the fan, for example in order to clean the fan.

[0019] In this document, free access to the fan is understood to mean access allowing a user to access, with at least one of his hands, directly to the fan by bypassing the heating device. In particular, such free access allows a user to directly and freely access the fan for example with a cleaning utensil, such as a cloth or a sponge, or with his hand in view of a fan cleaning operation.

[0020] The electric cooking appliance may further have one or more of the following features, which may be taken alone or in combination.

[0021] According to one embodiment of the invention, the heating device is configured to be moved to the cleaning configuration in a displacement movement that is directed away from the bottom wall of the cover. In other words, the heating device is configured to be moved to the cleaning configuration by being moved away from the bottom wall of the cover.

[0022] According to one embodiment of the invention, the heating device comprises an electrical heating resistor.

[0023] According to one embodiment of the invention, the cover comprises an upper cover portion and a lower cover portion, the lower cover portion comprising the lower wall of the cover and the heating device being mounted to move relative to the lower cover portion.

[0024] According to one embodiment of the invention, the upper cover portion and the lower cover portion are irremovable relative to each other. By irremovable, it is meant that the upper and lower cover portions cannot be dismantled by a user during standard use of the electric cooking appliance.

[0025] According to one embodiment of the invention, the electric cooking appliance comprises a connecting device configured to mechanically connect the heating device to the lower cover portion.

[0026] According to one embodiment of the invention, the heating device is pivotally mounted relative to the cover around a pivot axis.

[0027] According to one embodiment of the invention, the pivot axis is substantially horizontal when the housing rests on a horizontal surface.

[0028] According to one embodiment of the invention, the connecting device is a pivot connection.

[0029] According to one embodiment of the invention, the connecting device is a ball joint configured to allow movement of the heating device along any axis.

[0030] According to one embodiment of the invention, the electric cooking appliance comprises a return member, such as a return spring for example, configured to urge the heating device into the functional configuration.

[0031] According to one embodiment of the invention, the return member is a torsion spring which is configured to extend substantially coaxially with the pivot axis around which the heating device is pivotally mounted.

[0032] According to one embodiment of the invention, the electric cooking appliance comprises a holding member, such as a holding hook for example, configured to hold the heating device in the functional configuration.

[0033] According to one embodiment of the invention, the holding member is fixed to the lower cover part.

[0034] According to one embodiment of the invention, the heating device is removably attached relative to the cover.

[0035] According to one embodiment of the invention, the cover is pivotally mounted relative to the housing around a cover axis. Advantageously, the cover axis is substantially horizontal when the housing rests on a horizontal surface.

[0036] According to one embodiment of the invention, the lid and the cooking tank are configured to delimit a cooking chamber when the lid occupies the closed position.

[0037] According to one embodiment of the invention, the cooking tank comprises an access opening through which food can be introduced into the cooking tank. Advantageously, the cooking tank comprises an upper peripheral edge delimiting the access opening.

[0038] According to one embodiment of the invention, the fan is configured to extend substantially opposite the cooking tank, and for example opposite the access opening, when the cover is in the closed position.

[0039] According to one embodiment of the invention, the heating device is configured to be located at least partly opposite the cooking tank, and for example opposite the access opening, when the cover occupies the closed position and the heating device is in the functional configuration.

[0040] According to one embodiment of the invention, the heating device comprises a main heating portion configured to extend below the fan when the heating device is in the operative configuration and the cover is in the closed position.

[0041] According to one embodiment of the invention, the heating device comprises at least one heating portion configured to extend around the fan. In such a configuration of the electric cooking appliance, the cleaning configuration of the heating device further provides access to a peripheral portion of the fan, said peripheral portion being inaccessible when the heating device is in the operational configuration.

[0042] According to one embodiment of the invention, the main heating portion extends substantially horizontally when the heating device is in the operational configuration, the cover is in the closed position and the housing is resting on a horizontal surface.

[0043] According to one embodiment of the invention, the main heating part extends substantially coaxially with the axis of rotation.

[0044] According to one embodiment of the invention, the electric cooking appliance comprises a power supply portion configured to electrically power the heating device, the power supply portion being provided at least partly in the cover and being configured to be electrically connected to a power source.

[0045] According to one embodiment of the invention, the electrical power supply part comprises a flexible power supply cable.

[0046] According to one embodiment of the invention, the electrical power supply part is integral and irremovable relative to the cover.

[0047] According to one embodiment of the invention, the fan is removably fixed relative to the cover, and for example relative to the lower cover part.

[0048] According to one embodiment of the invention, the heating device delimits, in the cleaning configuration, at least in part a lateral clearance configured to allow movement of the fan transversely to the axis of rotation when the fan is detached from the cover. In other words, the lateral clearance is configured to allow the passage of the fan as well as the hand of a user in order to install and remove the fan.

[0049] According to one embodiment of the invention, the drive unit comprises a drive motor and a drive shaft coupled in rotation to the drive motor, the fan being configured to occupy a use configuration in which the fan is rotationally secured to the drive shaft, and a cleaning configuration in which the fan is detached from the drive shaft and is capable of being dissociated from the cover.

[0050] According to one embodiment of the invention, the drive motor is housed in the cover.

[0051] According to one embodiment of the invention, the drive shaft extends along the axis of rotation and through a passage orifice provided on the cover. Advantageously, the drive shaft projects from the lower face of the cover.

[0052] According to one embodiment of the invention, the electric cooking appliance comprises a measuring device configured to measure a power supply parameter of the electric motor during an operating cycle of the drive unit, and the control unit is configured to detect the presence or absence of the fan as a function of the measured value of the power supply parameter, i.e. whether the fan is attached or not to the cover, as a function of the measured value of the power supply parameter and to prohibit the operation of the heating device in the event of absence of the fan.

[0053] According to one embodiment of the invention, the control unit is configured to trigger at least one action of the electric cooking appliance, and for example prevent operation of the electric cooking appliance according to the hot air cooking mode, when the absence of the fan has been detected by the control unit.

[0054] The electrical power consumed by the drive motor is relatively low when the fan is not attached to the fan. On the contrary, when the fan is present, the necessary motor torque, and therefore the electrical power consumed, is higher, and varies according to the rotation speed of the fan. Since the motor torque of the electric motor is proportional to a power supply parameter of the electric motor, such as the power supply current of the electric motor, monitoring such a power supply parameter by the control unit makes it possible to easily detect a variation in the motor torque of the electric motor during an operating cycle of the electric motor, and thus to detect in particular the absence of a fan when the power supply parameter is relatively low.Thus, the electric cooking appliance according to the present invention makes it possible to automatically detect the presence or absence of the fan without the addition of a specific sensor dedicated to this function.

[0055] According to one embodiment of the invention, the electric cooking appliance comprises a fixing device comprising a first fixing part fixed to the drive shaft, and for example to a lower end portion of the drive shaft, and a second fixing part fixed to the fan and configured to be reversibly assembled to the first fixing part.

[0056] According to one embodiment of the invention, the second fixing part is fixed to a hub of the fan, said hub being centered on the axis of rotation.

[0057] According to one embodiment of the invention, one of the first fixing part and the second fixing part is a male fixing part and the other of the first fixing part and the second fixing part is a female fixing part.

[0058] According to one embodiment of the invention, the fixing device is a bayonet fixing device. Such a configuration of the fixing device allows for quick and easy assembly and disassembly of the fan; the assembly and disassembly of the fan being carried out by a user without the use of tools. Brief description of the figures

[0059] The present invention will be better understood with the aid of the description which follows with reference to the appended figures, in which identical reference signs cor correspond to structurally and / or functionally identical or similar elements.

[0060] [Fig. 1] is a schematic sectional view of an electric cooking appliance according to a first embodiment of the invention, showing a cover of the electric cooking appliance in a closed position;

[0061] [Fig.2] is a schematic sectional view of the electric cooking appliance of [Fig.l], showing the lid in an open position and showing a heating device in an operative configuration;

[0062] [Fig.3] is a schematic sectional view of the electric cooking appliance of [Fig.l], showing the lid in the open position and the heating device in a cleaning configuration;

[0063] [Fig.4] is a schematic sectional view of the electric cooking appliance of [Fig.l], showing the cover in an open position and showing an operation for dismantling a fan fitted to the electric cooking appliance;

[0064] [Fig.5] is a schematic sectional view of an electric cooking appliance according to a second embodiment of the invention, showing the cover of the electric cooking appliance in the closed position and the heating device in an operational configuration;

[0065] [Fig.6] is a schematic sectional view of the electric cooking appliance of [Fig.5], showing the lid in the open position and the heating device in the cleaning configuration. Detailed description

[0066] Unless otherwise stipulated, the term “substantially” means, in this document, “exactly or to within 10% or 10°”.

[0067] In this document, the terms "upper", "lower" and "below" are defined with respect to normal use of the electric cooking appliance 1 during which the housing rests on a horizontal surface.

[0068] Figures 1 to 4 represent an electric cooking appliance 1, such as an electric hot air cooking appliance or an electric multi-cooker, according to a first embodiment of the invention. The electric cooking appliance 1 is configured to cook food, such as meat, fish, vegetables or others, and comprises a control unit 2 configured to control an operation of the electric cooking appliance 1 according to at least one hot air cooking mode and the operation of which will be detailed below.

[0069] The electric cooking appliance 1 comprises a housing 3 comprising a receiving housing 4, and a cooking tank 5 removably mounted in the receiving housing 4 and configured to receive food to be cooked. The cooking tank 5 has an access opening 6, delimited by an upper peripheral edge 7 of the cooking tank 5, through which food can be introduced into the cooking tank 5.

[0070] According to the first embodiment of the invention shown in Figures 1 to 4, the electric cooking appliance 1 comprises a cover 8 pivotally mounted about a cover axis A1 which is substantially horizontal when the housing 3 rests on a horizontal surface. The cover 8 is configured to occupy a closed position (see [Fig.l]) in which the cover 8 prevents access to the cooking tank 5 and an open position (see Figures 2 to 4) in which the cover 8 allows access to the cooking tank 5.

[0071] The cover 8 comprises in particular a lower wall 9 which is configured to extend substantially opposite the access opening 6 provided on the cooking tank 5 when the cover 8 occupies the closed position. The cover 8 and the cooking tank 5 are further configured to delimit a cooking chamber when the cover 8 occupies the closed position.

[0072] The cover 8 further comprises an upper cover portion 8.A and a lower cover portion 8.B. The lower cover portion 8.B comprises the lower wall 9 of the cover 8. The upper cover portion 8.A and the lower cover portion 8.B are irremovable from each other. By irremovable, it is meant that the upper and lower cover portions 8.A, 8.B are not removable by a user during normal use of the electric cooking appliance 1.

[0073] The electric cooking appliance 1 further comprises a hot air cooking system 10 arranged at least partly in the cover 8 and configured to generate a flow of hot air on the food received in the cooking tank 5 when the electric cooking appliance 1 is in the hot air cooking mode.

[0074] The hot air cooking system 10 comprises a fan 11 mechanically connected to the cover 8 and a drive unit 12 configured to rotate the fan 11 about an axis of rotation A2. The drive unit 12 comprises in particular a drive motor 12.1 housed in the cover 8, and a drive shaft 12.2 coupled in rotation on the one hand to the drive motor 12.1 and on the other hand to the fan 11. Advantageously, the drive shaft 12.2 extends along the axis of rotation A2 and through a passage orifice provided on the cover 8 so as to project from the lower face of the lower wall 9.

[0075] More specifically, the fan 11 is configured to generate an airflow over food received in the cooking tank 5. As shown in [Fig.l], the fan 11 is configured to extend substantially opposite the cooking tank 5, and more particularly to extend opposite the access opening 6, when the cover 8 is in the closed position.

[0076] The hot air cooking system 10 further comprises a heating device 13 mechanically connected to the cover 8 via a connecting device 14, and configured to heat the air flow generated by the fan 11.

[0077] According to the embodiment of the invention shown in Figures 1 to 4, the connecting device 14 is a pivot connection allowing the heating device 13 to pivot relative to the lower cover portion 8.B about a pivot axis A3. The connecting device 14 is configured to allow the heating device 13 to pivot between an operational configuration in which the heating device 13 is close to the fan 11 (see Figures 1 and 2) and a cleaning configuration in which the heating device 13 is far from the fan 11 (see [Fig. 3]) and is configured to allow free access to the fan. Advantageously, the pivot axis A3 is substantially horizontal when the housing 3 rests on a horizontal surface. As shown in [Fig.3], the heating device 13 delimits, in the cleaning configuration, a lateral clearance configured to allow free access to the fan 11. In other words, the lateral clearance is configured to allow the passage of a user's hand for example.

[0078] Such a configuration of the electric cooking appliance 1 makes it possible to move the heating device 13 from the functional configuration to the cleaning configuration, and thus to create a lateral clearance allowing easy access to the fan 11, for example in order to dismantle the fan 11 and clean the latter.

[0079] According to the embodiment shown in the figures, the heating device 13 comprises an electrical heating resistor, and is configured to be located at least partly opposite the cooking tank 5, and in particular opposite the access opening 6, when the cover 8 occupies the closed position and the heating device 13 is in the functional configuration. More particularly, the heating device 13 comprises a main heating portion 13.1 configured to extend below the fan 11 when the heating device 13 is in the functional configuration and the cover 8 is in the closed position. The main heating portion 13.1 extends substantially horizontally when the cover 8 occupies the closed position, the heating device 13 is in the functional configuration and the housing 3 rests on a horizontal surface.

[0080] According to the first embodiment of the invention visible in Figures 1 to 4, the electric cooking appliance 1 further comprises an electrical power supply part 15 configured to electrically power the heating device 13. The electrical power supply part 15 may for example comprise a cable flexible power supply electrically connected to the heating device 13. Advantageously, the electrical power supply portion 15 is provided at least partly in the cover 8, and is configured to be electrically connected to an electrical power source.

[0081] Advantageously, the electric cooking appliance 1 also comprises a return member 16 configured to urge the heating device 13 into the functional configuration and to maintain it in the functional configuration. Advantageously, the return member 16, which may be a torsion spring for example, is configured to extend coaxially with the connecting device 14 in order to exert a return force capable of returning the heating device 13 from the cleaning configuration to the functional configuration when no stress is applied to the heating device 13 by the user.

[0082] According to the first embodiment of the invention shown in Figures 1 to 4, the fan 11 is removably fixed relative to the cover 8, and more particularly relative to the lower cover part 8.B. Thus, the fan 11 is configured to occupy a use configuration (see Figures 1 to 3) in which the fan 11 is rotationally integral with the drive shaft 12.2, and a cleaning configuration (see [Fig.4]) in which the fan 11 is detached from the drive shaft 12.2 and is capable of being dissociated from the cover 8.

[0083] Advantageously, and as seen more particularly in Figures 3 and 4, the electric cooking appliance 1 comprises a fixing device 18 comprising a first fixing part 18.1 fixed to the drive shaft 12.2, and for example to a lower end portion of the drive shaft 12.2, and a second fixing part 18.2 fixed to the fan 11 and configured to be reversibly assembled to the first fixing part 18.1. According to one embodiment of the invention, one of the first fixing part 18.1 and the second fixing part 18.2 is a male fixing part, and the other of the first fixing part 18.1 and the second fixing part 18.2 is a female fixing part. However, a bayonet type assembly or an equivalent mechanical assembly may nevertheless be technical alternatives that can be envisaged to a male / female assembly.

[0084] According to the embodiment of the invention shown in Figures 1 to 4, the electric cooking appliance 1 comprises a measuring device 19 configured to measure a power supply parameter of the electric motor 12.2, for example the power supply current of the electric motor 12.2, during an operating cycle of the drive unit 12. Advantageously, the control unit 2 is configured to detect the presence or absence of the fan 11, i.e. whether the fan 11 is attached to the cover 8 or not, depending on the measured value of the parameter power supply by the measuring device 19, and thus to prohibit the operation of the heating device 13 in the absence of the fan 11. According to one embodiment of the invention, the control unit 2 can be configured to trigger at least one action of the electric cooking appliance 1, and for example prevent operation of the electric cooking appliance 1 according to the hot air cooking mode, when the absence of the fan 11 has been detected by the control unit 2.

[0085] The electrical power consumed by the drive motor 12.1 is relatively low when the fan 11 is not attached to the fan 11. On the contrary, when the fan 11 is present, the necessary motor torque, and therefore the electrical power consumed, is higher, and varies according to the rotation speed of the fan 11. The motor torque of the drive motor 12.1 being proportional to a power supply parameter of the drive motor 12.1, such as the power supply current of the drive motor 12.1, the monitoring of such a power supply parameter by the control unit 2 makes it possible to easily detect a variation in the motor torque of the drive motor 12.1 during an operating cycle of the drive motor 12.1, and thus to detect in particular the absence of fan 11 when the power supply parameter is relatively low. Thus, the electric cooking appliance 1 according to the present invention makes it possible to automatically detect the presence or absence of the fan 11 without the addition of a specific sensor dedicated to this function.

[0086] Figures 5 and 6 show an electric cooking appliance 1 according to a second embodiment of the invention, which differs from the first embodiment of the invention essentially in that the electric cooking appliance 1 is optionally provided with the return member 16 and further comprises a holding member 17, such as a holding hook for example. The holding member 17 is configured to hold the heating device 13 in the functional configuration in order to prevent the mass of the heating device 13 or the rotation of the fan 11 from causing an involuntary movement of the heating device 13 from the functional configuration to the cleaning configuration, during operation of the electric cooking appliance 1 in hot air cooking mode for example.The holding member 17 may for example be movable between a holding position in which the holding member 17 is capable of holding the heating device 13 in the functional configuration, and a release position in which the holding member 17 allows movement of the heating device 13 into the cleaning configuration.

[0087] According to an embodiment of the invention not shown in the figures, the heating device 13 is fixed in a removable manner relative to the cover 8. Such a configuration of the invention makes it possible, for example, to clean the heating device 13, or to carry out the dismantling of the heating device 13 as part of after-sales service, for example.

[0088] Of course, the present invention is in no way limited to the embodiments described and illustrated which have been given only as examples. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

Claims

1. An electric cooking appliance (1) comprising: - a housing (3) comprising a receiving housing (4), - a cooking tank (5) configured to be arranged in the receiving housing (4) and to receive food to be cooked, - a cover (8) configured to occupy a closed position in which the cover (8) prevents access to the cooking tank (5) and an open position in which the cover (8) allows access to the cooking tank (5), the cover (8) comprising a lower wall (9) which extends substantially opposite the cooking tank (5) when the cover (8) occupies the closed position, - a hot air cooking system (10) configured to generate a flow of hot air on food received in the cooking tank (5),the hot air cooking system (10) comprising a fan (11) mechanically connected to the lid (8) and configured to generate an air flow over food received in the cooking tank (5), a drive unit (12) configured to rotate the fan (11) around an axis of rotation (A2), and a heating device (13) mechanically connected to the lid (8) and configured to heat the air flow generated by the fan (11), and - a control unit (2) configured to control the operation of the electric cooking appliance (1) according to at least one hot air cooking mode,characterized in that the heating device (13) is mounted to be movable relative to the cover (8) between an operational configuration in which the heating device (13) is close to the fan (11) and a cleaning configuration in which the heating device (13) is distant from the fan (11) and is configured to allow free access to the fan (11).,

2. An electric cooking appliance (1) according to claim 1, wherein the cover (8) comprises an upper cover portion (8.A) and a lower cover portion (8.B), the lower cover portion (8.B) comprising the lower wall (9) of the cover (8) and the heating device (13) being movably mounted relative to the lower cover portion (8.B).

3. An electric cooking appliance (1) according to claim 1 or 2, wherein the heating device (13) is pivotally mounted relative to the cover (8) around a pivot axis (A3).

4. An electric cooking appliance (1) according to any one of claims 1 to 3, which comprises a return member (16) configured to bias the heating device (13) into the operational configuration.

5. An electric cooking appliance (1) according to any one of claims 1 to 4, which comprises a holding member (17) configured to hold the heating device (13) in the operational configuration.

6. An electric cooking appliance (1) according to any one of claims 1 to 5, wherein the heating device (13) is removably attached relative to the cover (8).

7. An electric cooking appliance (1) according to any one of claims 1 to 6, wherein the fan (11) is removably attached relative to the cover (8).

8. An electric cooking appliance (1) according to any one of claims 1 to 7, wherein the drive unit (12) comprises a drive motor (12.1) and a drive shaft (12.2) rotatably coupled to the drive motor (12.1), the fan (11) being configured to occupy a use configuration in which the fan (11) is rotationally secured to the drive shaft (12.2), and a cleaning configuration in which the fan (11) is detached from the drive shaft (12.2) and is capable of being dissociated from the cover (8).

9. An electric cooking appliance (1) according to claim 8, which comprises a fixing device (18) comprising a first fixing part (18.1) fixed to the drive shaft (12.2), and a second fixing part (18.2) fixed to the fan (11) and configured to be reversibly assembled to the first fixing part (18.1).

10. An electric cooking appliance (1) according to any one of claims 1 to 9, which comprises a measuring device (19) configured to measure a power parameter of the electric motor during an operating cycle of the drive unit (12), and the control unit (2) is configured to detect the presence or absence of the fan (11) depending on the measured value of the power parameter and to prohibit the operation of the heating device (13) in the absence of the fan (11).

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