DE102013204135A1 - Hood - Google Patents

Abstract

An extractor hood (2) with an electronically commutated blower motor (14) and a control device (21), which is adapted to the blower motor (14) with a first or a second torque-speed characteristic (DK1, DK1a) to control, said the torque-speed characteristics (DK1, DK1a) have at least one common point (MA1, MS1).

Description

The present invention relates to an extractor hood.

In extractor hoods, blower motors in the form of asynchronous motors were mainly used in the past due to their cost-effective design. The asynchronous motors are usually designed as a capacitor or gap motors. The power control is via winding taps or a phase control. In such asynchronous motors, the torque-speed characteristic is predetermined by their design and therefore can only be changed to a limited extent.

Extractor hoods can be used in kitchens as exhaust or recirculation units. When used as an exhaust air device, the hood is connected to a piping at the customer, which leads the filtered from the hood air from the kitchen out. In recirculation mode, on the other hand, the extractor hood is directly connected to the air volume of the kitchen interior without the interposition of piping. Depending on whether a piping is present or how this is configured, results for a particular extractor hood an individual system characteristic. An intersection of the system characteristic curve with a delivery volume-pressure difference characteristic of the extractor hood results in the operating point of the extractor hood. The operating point means that delivery volume and that pressure difference, which or which sets in the operation of the hood. The delivery volume-pressure difference characteristic is in a fixed relationship with the torque-speed characteristic of the induction motor. Since now the torque-speed characteristic of an asynchronous motor is specified, so the delivery volume-pressure difference curve of the cooker hood is determined accordingly.

An object of the present invention is to provide an improved extractor hood.

Accordingly, an extractor hood with an electronically commutated blower motor and a control device is provided. The control device is configured to control the fan motor with a first or a second torque-speed characteristic, wherein the torque-speed characteristics have at least one common point.

The blower motor is thus designed as an electronically commutated synchronous motor, which is operated with direct current. Other designations for such motors are BLDC (brushless DC motor) or EC motor (electronically commutated motor). Due to the electronic commutation, the present blower motor has a high flexibility in terms of its control options. In particular, the torque-speed characteristic and thus also the delivery volume-pressure difference characteristic - within certain limits - freely selectable and customizable. In particular, the controller may include software that defines the first and second torque-speed characteristics. The torque-speed characteristics may be stored on a memory of the control device. In particular, the torque-speed characteristics can be stored in the form of value tables. The control device can be provided, for example, in the form of a computer device, in particular as a microprocessor.

In order that the torque-speed characteristics have at least one common point, it is meant that the torque-speed characteristics in a first area (in at least one point) an identical torque-speed value pair or an identical course and in a second Range have a different torque-speed value pair or a different course. For example, the first torque-speed characteristic may be associated with a normal mode of a first operator-selectable stage of the cooker hood. The second torque-speed characteristic may be associated with a power mode of the hood in the first stage of operation. The power mode can correspond to an operation of the hood in which the delivery volume is increased compared to the normal mode. For example, if the operator activates the power mode, the extractor hood has, for example, an improved extraction in each of four operating stages compared to a respective normal mode. This is enough to satisfy the customer, who attaches importance to a very quick cleaning of the kitchen air during cooking or regularly prepares dishes that produce a lot of steam. Or it is, for example, by means of the second torque-speed characteristic, an Eco mode shown, in which the hood causes, for example, each of its four operating levels compared to a respective normal mode less noise. For example, the eco mode can be selected by a sound-sensitive customer.

The proposed extractor hood thus has a high degree of flexibility and, as far as its delivery volume-pressure difference characteristic curve is concerned, can be adapted individually to customer requirements or other general conditions, for example a system characteristic curve.

According to one embodiment, the control device is configured to control the fan motor with a third torque-speed characteristic, wherein the first and the third torque-speed characteristic have at least one common point. Thus, for example, the first torque-speed curve can correspond to a normal mode of a first operating stage of the hood. The second torque-speed characteristic may correspond to the aforementioned power mode of the first operation stage and the third torque-speed characteristic to the aforementioned Eco mode of the first operation stage.

According to a further embodiment, the control device is adapted to control the fan motor with a fourth torque-speed characteristic. The fourth torque-speed characteristic has no common point with the first, second and / or third torque-speed characteristic. Thus, the fourth torque-speed curve, for example, corresponds to a normal mode of a second stage of the extractor hood. In other words, for example, the fourth torque-speed characteristic differs from the first torque-speed characteristic in that a respective different torque is provided over the entire speed range.

According to a further embodiment, the first, second, third and / or fourth torque-speed characteristic curve has an asynchronous characteristic. An asynchronous characteristic is characterized in that at a greater air resistance, so for example at a longer tubing at the customer, the torque of the fan motor is reduced and the speed of the fan motor increases accordingly. This effect has the advantage that the extractor hood becomes more pressure-stable. In other words, the control device controls the fan motor in such a way that a delivery volume conveyed through the extractor hood and a casing connected downstream of any downstream of the extractor hood remains the same with greater air resistance.

According to a further embodiment, the asynchronous characteristic has a tightening torque, a saddle torque, a tilting moment and / or a rated speed. The asynchronous characteristic thus corresponds in principle to a torque-speed characteristic which corresponds to the shape of a horizontal "S". In other words, the asynchronous characteristic of the torque-speed characteristic includes a valley which has been followed in the direction of increasing speed by a mountain. As the nominal speed approaches, the torque decreases asymptotically to zero.

According to a further embodiment, the first, second and / or third torque-speed curve have the same tightening torque, the same caliper torque and / or the same rated rotational speed and a different tilting moment. The second and third torque-rotational speed characteristic therefore deviate at least in sections from the first torque-rotational speed characteristic in the region of the overturning moment. In the working range of the fan motor, which extends from shortly before the overturning moment up to the rated speed, a different course thus results for the first, second and third torque-speed characteristic curve.

According to a further embodiment, the first and fourth torque-rotational speed characteristic curve differ from one another with regard to their tightening torque and / or fifth wheel torque. The first torque-speed characteristic may be assigned to a normal mode of a first operating stage and the fourth torque-rpm characteristic to a normal mode of a second operating stage of the extractor hood. For the customer, it may be desirable for the fan motor in the first and second stages of operation to have different behavior over the entire speed range.

According to a further embodiment, the fourth torque-rotational speed characteristic is shifted parallel to the first torque-rotational speed characteristic. As a result, for example, in the mentioned first and second operating stage of the hood a comparable torque-speed behavior, but with a magnitude different torque.

According to a further embodiment, when the extractor hood of the first torque / rotational speed characteristic is used as intended, a first delivery volume / pressure difference characteristic, the second torque / speed characteristic a second delivery volume / pressure difference characteristic, the third torque / speed characteristic a third delivery volume Pressure difference characteristic and / or the fourth torque-speed characteristic associated with a fourth displacement volume pressure difference characteristic. The delivery volume is the volume of air (including any vapor), which is conveyed per unit time through the extractor hood and any associated with this piping by means of the fan motor. The pressure difference in this case means the pressure difference with which the fan motor acts on the air volume. The pressure difference can be measured, for example, between an air outlet of the extractor hood and an environment of the extractor hood. The pressure difference can be measured on the air outlet side as a static pressure difference in a pressure chamber. The delivery volume can be measured by means of a pressure chamber downstream venturi. If the blower motor is activated only as a function of, for example, the first torque / speed characteristic curve, a delivery volume and a pressure difference are produced as a function of an internal resistance of the extractor hood (in recirculation mode) or in addition to a resistance of a piping connected to the extractor hood one. This pair of values corresponds to an operating point of the fan motor which is also referred to herein as an operating point. This operating point is based on the first delivery volume-pressure difference characteristic. This operating point also corresponds exactly to a value pair of the first torque-speed characteristic curve.

According to a further embodiment, the first, second and / or fourth delivery volume-pressure difference characteristic has an at least partially convex course and the third delivery volume-pressure difference characteristic has an at least sectionally concave profile. For example, the second displacement-pressure difference characteristic curve correspond to a power mode and the third delivery-volume-pressure difference characteristic corresponds to an eco-mode of the extractor hood. By switching between these two modes, for example, due to an input of the user or automatically through the hood, the working point of the hood changed. For example, a system characteristic curve of the extractor hood, if appropriate in conjunction with a piping, can describe the pressure difference as a function of the volumetric flow through the extractor hood and, if appropriate, the piping.

This system characteristic can have a convex, in particular parabolic course. By switching between in particular the second and third delivery volume-speed characteristic curve of the extractor hood, the operating point is shifted along the system characteristic curve. As a result, for example, a suction power of the hood can be increased (power mode), or it can unwanted noise of the hood can be reduced (Eco mode).

According to a further embodiment, the pressure difference of the second displacement-pressure difference characteristic curve for each delivery volume is greater than or equal to the pressure difference of the first delivery volume-pressure difference characteristic curve. Additionally or alternatively, the pressure difference of the third delivery volume-pressure difference characteristic for each delivery volume is less than or equal to the pressure difference of the first delivery volume-pressure difference characteristic. Thus, the second delivery volume-pressure difference characteristic is particularly suitable, a power mode of the hood and the third delivery volume pressure difference characteristic particularly suitable to represent an eco-mode of the hood.

According to a further embodiment, the fourth delivery volume-pressure difference characteristic is shifted parallel to the first delivery volume-pressure difference characteristic. As a result, for example, a boost mode of the hood can be provided.

According to a further embodiment, the control device is set up to control the fan motor as a function of the first or second (or fourth) torque / rotational speed characteristic as a function of a timer (timer). For example, such a temporary boost mode can be provided: For example, this means that the control device initially controls the blower motor as a function of the first torque / speed characteristic curve. After the start of the timer, in particular by a user input, the controller controls the fan motor with the fourth (or second) torque-speed curve. After expiration of a time period stored on the timer, which can be adjusted in particular by an operator, the control device controls the fan motor again as a function of the first torque-speed characteristic curve.

According to a further embodiment, the control device is set up to determine whether the extractor hood is in its intended use in a recirculation or exhaust air operation. The control device is further configured to control the blower motor with the first, second or third torque / rotational speed characteristic as a function of the result of this determination. Through tests, in particular by connecting the hood with piping of different air resistance, either a recirculation or an exhaust air operation can be assigned to the various points on a respective torque-speed curve. This assignment can be stored, for example, in the form of a table on a memory of the control device. Since torque and speed when using the hood at the customer are known at all times, it can be concluded from this, in particular taking into account the above-mentioned table on a recirculation or exhaust air operation. The control device can now continue to be set up in such a way that it activates the blower motor with the second torque / rotational speed characteristic in the exhaust air mode, which corresponds, for example, to a power mode. Since in this case, so if a piping is present, a larger capacity is needed, this may be desirable for a customer. Similarly, if a recirculation mode is detected, So no piping is present, the fan motor with the third torque-speed characteristic, so for example an Eco mode, are controlled. In recirculation mode due to the lack of piping only a lower flow rate is required to sufficiently suck the hotplate.

According to a further embodiment, the control device is adapted to recognize the intended use of the extractor hood, whether a saturation of a filter occurred or a blockage of a connected to the extractor casing piping is present. The control device is further configured to control the blower motor with the first, second or third torque-speed characteristic as a function of this. For example, the control device may be configured to detect a change in the mentioned operating point over time. As described above, the operating point for a specific installation situation and hood is fixed. However, this may change over time, for example, due to filter saturation or clogging. This can then be detected by the control device. If, for example, a filter saturation is detected, the control device can automatically switch over from the first torque / rotational speed characteristic curve to the second torque / rotational speed characteristic, that is to say, for example, the power mode, in order to compensate for the loss of delivery volume.

According to a further embodiment, the control device is adapted to control the fan motor in response to a determined system characteristic with the first, second, third or another torque-speed characteristic. As a result, it can be taken into account that in embodiments for different pipelines, a boost, eco or power mode can be configured differently.

According to a further embodiment, the control device is adapted to control the fan motor in response to a user input with the first, second, third or fourth (or another) torque-speed characteristic. For example, the extractor hood for this purpose an input device, in particular in the form of a touch screen, one or more switches and / or one or more buttons have. The user may then select the first, second, third, or fourth (or more) torque-speed characteristics as desired. For example, the user may switch between the first and fourth torque-speed characteristics, which correspond to a normal mode of a first and second operating stage of the hood. Furthermore, starting from the normal mode, the user can select, for example, a power mode, an eco mode and / or a boost mode from the first operating stage. Furthermore, the extractor hood may have a display device which is adapted to indicate whether the control device controls the fan motor with the first, second, third or fourth (or a further) torque-rotational speed characteristic. In particular, the display device can be designed as a screen, in particular TFT screen and / or touchscreen. Furthermore, the display device can be set up to display the current delivery volume flow, for example in the form of cubic meters per hour. The corresponding values, the controller, as mentioned above, determined from the current torque and the current speed. Furthermore, the display device may be configured to indicate to the operator whether the extractor hood is in the first, second, third or another operating stage. In addition, the indicator may be configured to indicate whether the hood is in the aforementioned power mode, eco mode, or boost mode.

According to a further embodiment, the second and / or third torque-speed characteristic curve is selected in order to avoid unwanted resonances when the extractor hood is used as intended. Through tests, in particular by connecting the hood with different casings, it can be determined for which torque-speed value pairs results in an unwanted resonance. If these pairs of values are, for example, on the first torque / rotational speed characteristic curve, the control device can automatically bypass these undesired operating points by controlling the fan motor as a function of the second or third torque / rotational speed characteristic curve for a certain speed range. This behavior can also be stored on a memory of the control device.

The extractor hood is preferably designed as a household appliance.

Furthermore, a (further) extractor hood with an electronically commutated fan motor and a control device is provided. The control device is adapted to control the fan motor with a first, second or third torque-speed characteristic. The first and third torque-speed characteristics are each selectable by an operator by means of an input device. The control device is further set up to control the blower motor based on a parameter determined by the latter, based on the first or third torque / rotational speed characteristic with the second torque / rotational speed characteristic curve.

In other words, an operator person can switch the extractor hood between a first operating stage (first torque-rotational speed characteristic) and a second operating stage (second torque-rotational speed characteristic), for example by pressing a button. The switching from the first torque-speed characteristics to the second torque-speed characteristic then makes the control device in particular self-acting in order to take into account certain boundary conditions, for example a currently present system characteristic curve or an operator request for fewer noises or more delivery volumes , The frame condition or the operator request can each form the parameters determined by the control device. For example, a boost, power or eco mode of the hood can be provided. The user request can be communicated to the control device by an input device of the extractor hood. The first and second torque-speed characteristics may have an asynchronous characteristic and / or be parallel to each other. The third torque-speed characteristic may lie between and / or be parallel to the first and second torque-speed characteristics. Alternatively, the third torque-speed characteristic may have at least one common point with the first torque-speed characteristic and / or an asynchronous characteristic.

The embodiments described for the extractor hood apply to the further extractor hood, and vice versa.

It should be noted that in the present case, the terms first, second, etc. torque-speed characteristic / displacement-pressure difference characteristic curve, etc. are used. However, this is just a better distinction. A change of the name, for example "fourth" instead of "second", is therefore possible at any time if required.

Furthermore, a cooker hood assembly is provided with a casing and a previously described hood. The piping runs, for example, in or on a building. The extractor hood is coupled with the piping to conduct air.

In addition, a method for operating an extractor hood is provided. In the method, an electronically commutated fan motor with a first or a second torque-speed characteristic is controlled by means of a control device, wherein the torque-speed characteristics have at least one common point.

Furthermore, a (further) method for operating an extractor hood is provided. In the method, an electronically commutated fan motor with a first, second or third torque-speed characteristic is controlled by means of a control device. The first or third torque-speed characteristic is selected by an operator by means of an input device. Thereafter, the blower motor is driven in response to a determined by the controller parameters based on the selected first or third torque-speed curve with the second torque-speed curve.

The embodiments described herein in relation to the extractor hood and the further extractor hood apply correspondingly to the present extractor hood arrangement as well as the present method.

Further possible implementations of the invention also include not explicitly mentioned combinations of features or embodiments of the extractor hoods, of the extractor hood arrangement and of the methods described above or below with regard to the exemplary embodiments. The skilled person will also add or modify individual aspects as improvements or additions to the respective basic form of the invention.

Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the embodiments of the invention described below. Furthermore, the invention will be explained in more detail by means of preferred embodiments with reference to the attached figures.

It shows:

1 FIG. 2 schematically shows an extractor hood arrangement according to an embodiment; FIG.

2 : Torque-speed characteristics according to an embodiment;

3 : Delivery volume-pressure difference characteristics and system characteristics according to an embodiment;

4 : Delivery volume-pressure difference characteristics for a power and eco mode according to an embodiment;

5 : Delivery volume-pressure difference characteristics for a recirculation and exhaust operation according to an embodiment;

6 : Displacement-pressure differential curves for avoiding resonance according to an embodiment;

7 : Delivery volume-pressure difference characteristics for a boost mode according to an embodiment; and

8th : Delivery volume-pressure difference characteristics for a boost, power and Eco mode according to another embodiment.

In the figures, the same reference numerals designate the same or functionally identical components, unless stated otherwise.

1 schematically shows an extractor hood assembly 1 according to one embodiment.

The extractor hood arrangement 1 includes a cooker hood 2 , which above a cooking area 3 arranged in a kitchen. The extractor hood 2 can be designed for example as a hood or dining. The extractor hood 2 can do this as well as a piping 4 - on a building wall 5 be attached to the kitchen. The extractor hood 2 promotes vapors during operation 6 from above the hob 3 via an air inlet 7 to an air outlet 11 the same. The air outlet 11 is about the piping 4 connected with the environment outside the kitchen. Alternatively, the extractor hood - as will be explained in more detail later - be provided as a recirculation unit, wherein the air outlet 11 with the interior 10 the kitchen is air-conductively connected.

The extractor hood 2 includes a fan 13 , The fan wheel 13 is powered by an electronically commutated blower motor 14 be driven. The fan wheel 13 forms with a surrounding spiral housing 15 a radial fan 16 out, which the Wrasen 6 through a grease filter 12 in the area of the air intake 7 sucks and through the air outlet 11 ejects. In doing so, the radial fan must 16 the internal air resistance of the extractor hood 2 , which in particular due to the radial fan 16 itself as well as an internal piping 17 results, overcome. Furthermore, the radial fan must 16 the air resistance of the piping 4 (as far as this is available) overcome the air to the outside of the interior 10 to promote the kitchen. The internal air resistance of the extractor hood 2 gives a system characteristic of the same in recirculation mode. The sum of the internal air resistance of the extractor hood 2 and the air resistance of the piping 4 gives the system characteristic curve in the exhaust air mode. Exemplary system characteristics are in 3 shown and labeled there AK1, AK2 and AK3.

Now returning to 1 there is further shown that the extractor hood 2 a control device 21 includes which the blower motor 14 controls. The control device is designed for example as a microprocessor and comprises a memory 22 , On the store 22 are in the form of software in 2 stored torque-speed characteristics stored.

2 shows a first torque-speed curve DK1, a second torque-speed curve DK1a, a third torque-speed curve DK1b, a fourth torque-speed curve DK2, and a fifth torque-speed curve DK3. The torque M of the blower motor 14 is represented as a function of its speed n.

The torque-speed characteristics DK1 to DK3 each have an asynchronous characteristic. That is, their shape corresponds to a lying "S". Further, this means that each of the torque-speed characteristics DK1 to DK3 a tightening torque M _A1 , M _A2 , M _A3 , a saddle moment M _S1 , M _S2 , M _S3 , a tilting moment M _K1 , M _K1a , M _K1b , M _K2 , M _K3 and a rated speed n _N includes. The tightening torque M _A1 , M _A2 , M _A3 corresponds to the torque of the fan motor 14 at a speed n = 0. Starting from the tightening torque M _A1 , M _A2 , M _A3 , the torque decreases until the fifth wheel torque M _S1 , M _S2 , M _S3 with increasing speed n and then rises again, and reaches its maximum M _K1 , M _K1a , M _K1b , M _K2 , M _K3 . After this, the torque M decreases again and approaches zero asymptotically towards the rated speed n _N. A workspace in which the blower motor 14 typically from the controller 21 during operation of the extractor hood 2 is controlled, is denoted by AH.

The torque-speed characteristics DK1, DK1a, DK1b have a sectionally identical course. Thus, the tightening torque and the saddle torque M _A1 , M _{S1 are} identical for the torque-rotational speed characteristics DK1 to DK1b. Only with regard to their _overturning moment M _K1 , M _K1a and M _K1b they differ. Thus, the tilting moment M _{K1a is} above the tilting moment M _K1 and the tilting moment M _{K1b is} below the tilting moment M _K1 . On the other hand, the torque / rotational speed characteristic curve DK2 runs parallel to the torque / rotational speed characteristic curve DK1 and is shifted upward with respect to this, that is to say characterized by a higher torque M. Consequently, the _overturning moment M _{K2 is} above M _K1a , M _K1 and M _K1b . The torque-speed characteristic DK3 also runs parallel to the torque-rotational speed characteristic DK1 and between this and the torque-rotational speed characteristic DK2.

The torque-speed characteristic DK1 is, for example, a normal mode of a first Operating level of the extractor hood 2 and the torque-speed characteristic DK2 a normal mode of a second operating stage of the hood 2 assigned. It is also possible to provide further operating stages, for example a third and a fourth operating stage, which are located in 1 are shown. Of course, an off-state of the hood or the fan motor 14 intended. For example, the cooker hood 2 , as in 1 shown buttons 23 by means of which the off-state "0" and the first to fourth operating levels "1", "2", "3", "4" are selectable. Depending on a currently pressed button 23 controls the controller 21 the blower motor 14 not (off state) or with the first torque / speed characteristic curve DK1 (first operation stage) or the fourth torque / rotational speed characteristic curve DK2 (second operation stage) or another torque / rotational speed characteristic (third and fourth operation stage). Instead of the buttons 23 could also be provided another input device.

The second torque-rotational speed characteristic DK1a corresponds, for example, to a power mode and the third torque-rotational speed characteristic DK1b corresponds to an eco mode, as will be explained in more detail below. Is now the hood 2 For example, in the normal mode (DK1) of the first operating state "1", so an operator person, the hood 2 by actuating an input device, for example in the form of a button 24 switch from the normal mode according to the first torque-speed characteristic DK1 in the power mode according to the torque-speed characteristic DK1a or the Eco mode according to the torque-speed characteristic DK1b. For example, switching to the power mode can take place if a higher delivery volume flow is desired. Switching to the Eco mode can be done if there is a noise coming from the cooker hood 2 reduced or energy saved. Switching to the Eco and Power mode can also be done when the hood 2 is operated in the normal mode of the second, third or fourth operating stage "2""3""4". The torque-speed curves DK2a and DK2b illustrate, by way of example, the power or eco mode assigned to the second operating level "2". The tilting moment M _K2a then lies above the tilting moment M _K2 and the tilting moment M _K2b below the tilting moment M _K2 .

Furthermore, the extractor hood 2 a display device, for example in the form of a TFT screen 25 include, on which is displayed, in which operating stage, the hood 2 located. Next, the TFT screen 25 Show if the hood 2 is in normal mode, power mode or eco mode. Still can the TFT screen 25 one from the cooker hood 2 show currently funded delivery volume, for example in cubic meters per hour. The TFT screen 25 can from the controller 21 be controlled accordingly. The input devices 23 . 24 could also be in the display device 25 be integrated by this example is designed as a touch screen, which is also input device for user commands.

The following is based on 3 the relationship between a pressure difference p and a delivery volume Q for different system characteristics AK1 to AK3 and different delivery volume pressure difference curves FK1 to FK4 explained in more detail.

3 shows the pressure difference p as a function of the delivery volume Q. The pressure difference p denotes a pressure difference between the ambient pressure in the kitchen interior 10 (please refer 1 ) and a pressure which, for example, in the air outlet 11 the extractor hood 2 is measured. The delivery volume Q means a volume of air delivered per unit time, for example in cubic meters per hour.

Each of the torque-speed characteristics off 2 is a delivery volume-pressure difference characteristic in 3 assigned. Thus, for example, corresponds to the torque-speed characteristic DK1 of the delivery volume-pressure difference characteristic FK1 and the torque-speed characteristic DK2 of the delivery volume-pressure difference characteristic FK2. The torque-speed characteristics corresponding to the displacement-pressure difference characteristic lines FK3 and FK4 are shown in FIG 2 Not shown. Each value pair of a respective torque-speed characteristic 2 has a correspondence on a respective delivery volume pressure difference characteristic 3 ,

Will now the extractor hood 2 operated for example as a recirculation unit and by means of a button 23 the first operating level "1" in the normal mode and thus the first delivery volume pressure difference characteristic curve FK1 selected, so there is an operating point AP1, at which the extractor hood 2 surgery. The operating point AP1 is an intersection between the delivery volume-pressure difference characteristic FK1 and the system characteristic AK1. The shape of the system characteristics AK1 to AK3 corresponds to a parabola which is characterized by the following equation: p = a * Q ² , wherein the parameter a for the system characteristics AK1 to AK3 differs and a function of Air resistance of the extractor hood 2 and / or the piping 4 is.

Thus, for example, the system characteristic AK2 a piping 4 with a first length and the system characteristic AK3 a piping 4 with a second length, wherein the second length is greater than the first length and, accordingly, the air resistance is higher. The operating points AP1, AP2, AP3 and AP4 result by switching between the operating levels "1" to "4" in the normal mode, see 2 ,

It can be provided that in particular the in 3 and 4 shown delivery volume-pressure difference characteristics FK1 to FK4, for example in the form of a table on the memory 22 the control device 21 are stored. Furthermore, in the table a respective delivery volume-pressure difference value pair p, Q associated torque-speed value pairs M, n be stored.

The table can be used, for example, in a production process of the extractor hood 2 on the store 22 be stored. Previously, the table is generated by operating a test cooker hood with different delivery volumes Q and pressure differences p. At the same time, the current torque and the respective current speed are written to the table. The current torque and the current speed can, for example, from the control device 21 be read out.

Will now the extractor hood 2 When commissioned at the customer, the control device 22 from the current torque M and the current speed n close to the flow Q and this, as in 1 shown to the operator person.

4 now shows a selected displacement-pressure difference characteristic FK1. It is like in 3 the pressure difference p plotted as a function of the delivery volume Q. The delivery volume-pressure difference characteristic FK1 off 4 corresponds to the torque-speed characteristic DK1 off 2 , A delivery volume-pressure difference characteristic FK1a corresponds to the torque-rotational speed characteristic DK1a and a delivery volume-pressure difference characteristic FK1b of the torque-rotational speed characteristic DK1b. The delivery volume-pressure difference characteristic FK1, FK1a and FK1b each have different points of intersection with the system characteristic curve AK1 shown by way of example, and correspondingly so far in each case different value pairs p, Q. These operating points of the extractor hood 2 are designated AP1, AP1a and AP1b. In 4 It can be seen that the first and second delivery volume-pressure difference characteristic FK1, FK1a has a convex course and the third delivery volume-pressure difference characteristic FK1b has a concave profile.

Based on 4 it becomes clear that in the first operating stage "1" the switching between the normal mode (FK1), the power mode (FK1a) and the eco mode (FK1b) to different delivery volumes Q through the extractor hood 2 leads. At the same time, noise generation and other parameters differ.

5 shows further displacement-pressure difference characteristics, for example, for the hood 2 out 1 ,

For example, on the memory 22 the control device 21 be deposited another torque-speed curve, which corresponds to the delivery volume-pressure difference characteristic FK1c. Next, the control device 21 Be set up to detect if the hood 2 is used in a recirculation or exhaust air operation. This can be done, for example, that the above-mentioned, on the memory 22 added table is added to the effect that certain value pairs p, Q are assigned to a recirculation mode and other value pairs p, Q an exhaust air operation. The value pairs p, Q can be assigned, for example, to a value range AB corresponding to an exhaust air operation and to a value range UB corresponding to a recirculation mode. The control device 21 can then, for example, decide automatically that they in the recirculation mode, the fan motor 14 with the delivery volume-pressure difference characteristic curve FK1 corresponding torque-speed characteristic DK1 and in the exhaust air operation, the fan motor 14 with the the delivery volume-pressure difference characteristic FK1c corresponding torque-speed characteristic (not shown) drives. This puts the blower motor 14 automatically in the exhaust mode, in which to work from home against a higher air resistance, a higher pressure difference p ready.

Likewise, the control device 21 decide if they have a shift of the operating points AP1 to AP4 (see 3 ) over time determines that a blockage of the grease filter 12 or the piping 4 is present. Accordingly, the control device 21 then the blower motor 14 in, for example, the first operating stage "1" with the torque-speed characteristic corresponding to the delivery volume-pressure difference characteristic FK1c - instead of the torque-speed characteristic DK1 corresponding to the delivery volume-pressure difference characteristic FK1 - to control the delivery volume despite the higher air resistance Q to keep it the same.

6 now shows the case that occur at an operating point APR resonances. This can be done, for example, by testing the cooker hood 2 in connection with, for example, different casings 4 be determined. It can now be provided that the operating point APR is bypassed by changing in sections from the delivery volume-pressure difference characteristic FK1 to a delivery volume-pressure difference characteristic FK1d. The control device 21 can be set up accordingly. The delivery volume-pressure difference characteristic FK1d corresponds to a predetermined torque-speed characteristic, which is not shown in any of the figures.

7 illustrates the possibility of providing a delivery volume-pressure difference characteristic FK1e, which is shifted parallel to the delivery volume-pressure difference characteristic FK1, for example in the direction of an increasing pressure difference p and an increasing delivery volume Q. Is the extractor hood, for example, in operation level "1" (Delivery volume-pressure difference characteristic FK1) and pushes the operator person a boost button 26 the extractor hood 2 so controls the controller 21 the blower motor 14 with one of the 2 shown torque-speed characteristic DK3 corresponding displacement volume pressure difference characteristic FK1e, so that, depending on the system characteristic AK2 or AK3 a significantly higher pressure difference (AK2) or a significantly higher flow volume (AK3) results. A possible boost operating point is designated AP1e. By pressing the boost button 26 starts the controller 21 in one embodiment, a timer 27 , After expiration of one on the timer 27 stored period switches the controller 21 back to the delivery volume-pressure difference characteristic FK1. The time span can be determined by the operator, for example by means of the touchscreen 25 be provided adjustable.

8th shows delivery volume-pressure difference characteristics, in particular for a boost, power and Eco mode according to another embodiment.

In addition to the positive boost volume-pressure difference characteristic FK1e off 7 shows 8th in that a negative boost-volume-pressure difference characteristic FK1g can also be provided which is shifted parallel to the delivery volume-pressure difference characteristic FK1g in the direction of lower pressure difference P and lower delivery volume Q.

Based on 8th is further illustrated that for different piping, ie system characteristics, an eco or power mode can be configured differently.

The delivery volume-pressure difference characteristic curves FK1f, FK1h correspond to the delivery volume-pressure difference characteristic curves FK1a, FK1b 4 in that they also have an intersection with the delivery volume-pressure difference characteristic FK1. However, the Eco-mode corresponding delivery volume-pressure difference characteristic FK1h is convex and not concave as the delivery volume-pressure difference characteristic FK1b.

The control device 21 may be adapted to the blower motor 14 as a function of a user input or automatically, for example as a function of a currently present system characteristic curve AK2, AK3, that of the control device 21 is determined to control with a one of the delivery volume-pressure difference characteristics FK1, FK1e, FK1f, FK1g or FK1h corresponding torque-speed characteristic. The user input and / or the current system characteristic curve AK2, AK3 is the control device 21 provided as one or more parameters. The activation as a function of a currently present system characteristic curve AK2, AK3 advantageously allows the operating points of the extractor hood 2 to a possibly provided piping 4 adapt. If it is determined, for example, that a system characteristic curve AK3 is present, the control device can 21 when the input device 25 detects a customer request for more delivery volume Q, decide that switching from the normal mode (FK1) with an operating point AP1-1 to a power mode (FK1f) with an operating point AP1f-1 yields too little additional delivery volume Q, and Therefore, switch to the boost mode (FK1e) with an operating point AP1e, which has a high additional delivery volume Q. Detects the controller 21 on the other hand, if a system characteristic curve AK2 is present, it switches over to the power mode (FK1f) with an operating point AP1f-2 with an operating point AP1-2 in the case of a customer request for more pressure difference p starting from the normal mode (FK1) because a sufficiently high additional pressure difference p is provided here.

Although the invention has been described herein with reference to preferred embodiments, it is not limited thereto, but variously modifiable.

LIST OF REFERENCE NUMBERS

1

 Hood arrangement

2

 Hood

3

 cooking

4

 piping

5

 building wall

6

 vapors

7

 air intake

10

 Kitchen interior

11

 air outlet

12

 grease filter

13

 fan

14

 blower motor

15

 casing

16

 centrifugal blower

17

 piping

21

 control device

22

 Storage

23

 stud

24

 stud

25

 TFT screen

26

 stud

27

 timer

FROM

 Extraction mode

AH

 Workspace

AK1

 Equipment characteristic

AK2

 Equipment characteristic

AK3

 Equipment characteristic

AP1

 working

AP1-1

 working

Ap1-2

 working

AP1a

 working

AP1b

 working

AP1D

 working

AP1f-1

 working

AP1f-2

 working

AP1e

 working

AP2

 working

AP3

 working

AP4

 working

April

 working

DK1

 Torque-speed characteristic

DK1a

 Torque-speed characteristic

DK1b

 Torque-speed characteristic

DK2

 Torque-speed characteristic

DK3

 Torque-speed characteristic

FK1

 Air flow pressure difference characteristic

FK1a

 Air flow pressure difference characteristic

FK1b

 Air flow pressure difference characteristic

FK1c

 Air flow pressure difference characteristic

FK1d

 Air flow pressure difference characteristic

FK1e

 Air flow pressure difference characteristic

FK1f

 Air flow pressure difference characteristic

FK1g

 Air flow pressure difference characteristic

FK1h

 Air flow pressure difference characteristic

FK2

 Air flow pressure difference characteristic

FK3

 Air flow pressure difference characteristic

FK4

 Air flow pressure difference characteristic

M

 torque

M _A1

 torque

M _A2

 torque

M _A3

 torque

M _K1

 overturning moment

M _K1a

 overturning moment

M _K1b

 overturning moment

M _K2

 overturning moment

M _K2a

 overturning moment

M _K2b

 overturning moment

M _S1

 Pull-up torque

M _S2

 Pull-up torque

M _S3

 Pull-up torque

n

 rotation speed

n _N

 Rated speed

UB

 recirculation mode

Claims (15)

Extractor hood ( 2 ) with an electronically commutated blower motor ( 14 ) and a control device ( 21 ), which is adapted to the blower motor ( 14 ) with a first or a second torque-speed characteristic (DK1, DK1a), wherein the torque-speed characteristics (DK1, DK1a) have at least one common point (M _A1 , M _S1 ). Extractor hood according to claim 1, characterized in that the control device ( 21 ) is adapted to the blower motor ( 14 ) with a third torque-rotational speed characteristic (DK1b), wherein the first and third torque-rotational speed characteristic (DK1, DK1b) have at least one common point (M _A1 , M _S1 ). Extractor hood according to claim 1 or 2, characterized in that the control device ( 21 ) is adapted to the blower motor ( 14 ) with a fourth torque-speed characteristic (DK2), wherein the fourth torque-speed characteristic (DK2) has no common point with the first, second and / or third torque-speed characteristic (DK1, DK1a, DK1b) , Extractor hood according to one of claims 1-3, characterized in that the first, second, third and / or fourth torque-speed characteristic (DK1, DK1a, DK1b, DK2) has an asynchronous characteristic, the asynchronous preferred Favor a torque (M _A1 , M _A2 ), a _{fifth wheel torque} (M _S1 , M _S2 ), a tilting moment (M _K1 , M _K1a , M _K1b , M _K2 ) and / or a rated speed (n _N ). Extractor hood according to claim 4, characterized in that the first, second and / or third torque-speed characteristic curve (DK1, DK1a, DK1b) have the same tightening torque (M _A1 , M _S1 ) and / or the same rated speed (n _N ) and a different tilting moment (M _K1 , M _K1a , M _K1b ). Extractor hood according to claim 4 or 5, characterized in that the first and fourth torque-rotational speed characteristic (DK1, DK2) with respect to their tightening torque (M _A1 , M _A2 ), saddle moment (M _S1 , M _S2 ) and / or tilting moment ( M _K1 , M _K2 ) differ from each other. Extractor hood according to one of claims 3-6, characterized in that the fourth torque-speed characteristic (DK2) relative to the first torque-speed characteristic (DK1) is moved in parallel. Extractor hood according to one of claims 1-7, characterized in that when used as intended the extractor hood ( 2 ) of the first torque-speed characteristic (DK1) a first displacement-pressure difference characteristic (FK1), the second torque-speed characteristic (DK1a) a second displacement-pressure difference characteristic (FK1a), the third torque-speed characteristic (DK1b) a third delivery volume-pressure difference characteristic (FK1b) and / or the fourth torque-speed characteristic (DK2) is associated with a fourth delivery volume-pressure difference characteristic (FK2). Extractor hood according to claim 8, characterized in that the first, second and / or fourth delivery volume-pressure difference characteristic (FK1, FK1a, FK2) at least partially convex course and the third delivery volume pressure difference characteristic (FK1b) at least partially convex course having. Extractor hood according to one of claims 1-9, characterized in that the control device ( 21 ) is designed to determine whether the extractor hood ( 2 ) is in intended use in a recirculation or exhaust air operation (UB, AB), and depending on the blower motor ( 14 ) with the first, second or third torque-speed characteristic (DK1, DK1a, DK1b) to control. Extractor hood according to one of claims 1-10, characterized in that the control device ( 21 ) is set up in the intended use of the extractor hood ( 2 ) to detect whether saturation of a filter ( 12 ) of the extractor hood ( 2 ) or a blockage of one with the extractor hood ( 2 ) connected piping ( 4 ), and depending on the blower motor ( 2 ) with the first, second or third torque-speed characteristic (DK1, DK1a, DK1b) to control. Extractor hood according to one of claims 1-11, characterized in that the control device ( 21 ) is arranged to control the blower motor in response to a user input with the first, second, third and / or fourth torque-speed characteristic, and / or that a display device ( 25 ) which is adapted to indicate whether the control device ( 21 ) the blower motor ( 14 ) with the first, second, third or fourth torque-speed characteristic (DK1, DK1a, DK1b, DK2) controls. Extractor hood according to one of claims 1-12, characterized in that the second and / or third torque-speed characteristic (DK1a, DK1b) to avoid unwanted resonance in a proper use of the extractor hood ( 2 ) is selected. Extractor hood arrangement ( 1 ) with a piping ( 4 ) and an extractor hood ( 2 ) according to any one of claims 1-13, which with the piping ( 4 ) is air-conductively coupled. Method for operating an extractor hood ( 2 ), in particular an extractor hood ( 2 ) according to one of the preceding claims 1-13, wherein an electronically commutated blower motor ( 14 ) with a first or a second torque-rotational speed characteristic (DK1, DK1a) by means of a control device ( 21 ) is driven, wherein the torque-speed characteristics (DK1, DK1a) have at least one common point.

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