DE102013204141A1 - Hood - Google Patents

Abstract

An extractor hood (2) with an electronically commutated fan motor (14), a timer (27) for providing a time signal (t1, t2) and a control device (21), which is adapted to the blower motor in response to the provided time signal (t1 , t2) with a first torque-speed characteristic (DK1) or with a second torque-speed characteristic (DK1a, DK1b, DK3) to control.

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 curve 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.

When operating an extractor hood, it may happen that the customer briefly, for example, due to increased vapor formation, wants a larger delivery volume. In conventional extractor hoods can now be manually switched to a higher operating level of the hood.

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

Accordingly, an extractor hood with an electronically commutated fan motor, a timer for providing a time signal and a control device is proposed. The control device is adapted to control the fan motor in response to the provided time signal with a first torque-speed characteristic or with a second torque-speed characteristic.

Advantageously, the torque-rotational speed characteristic of the fan motor and thus a corresponding delivery volume-pressure difference characteristic of the extractor hood is controlled by a timer. An example, manual switching can thus be omitted at least partially.

For example, the first torque-speed curve 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 boost or power mode of the hood in the (first) stage of operation. The boost or power mode can correspond to an operation of the hood in which the delivery volume is increased compared to the normal mode.

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.

According to one embodiment, the timer comprises a non-triggered mode in which it is arranged to provide the control means with a first time signal and a triggered mode in which it is arranged to provide the control means with a second time signal. When the first time signal is provided, the control device activates the fan motor with the first torque / rotational speed characteristic. In a provided second time signal, the control device controls the fan motor with the second torque-speed characteristic. A trigger event that switches the timer from the non-triggered mode to the triggered mode may be input by a user.

According to a further embodiment, a memory for storing a time period and a first input device for an input of a user is provided. The first input device is configured to switch the timer from the non-triggered mode to the triggered mode. The timer will automatically switch back from the triggered mode to the non-triggered mode after the time has elapsed. For example, if the operator requires a higher extraction capacity, for example because the kitchen air is to be cleaned quickly, or if a dish is being prepared in which a lot of vapor is being produced, the first input device can now be actuated. Thereafter, the controller switches from the first torque-speed curve (normal mode) to the second torque-speed curve (boost or power mode), but only until the stored time on the memory has expired. Without any further action by the user, the control device then switches back to the first torque / rotational speed characteristic (normal mode) after the expiry of the time period. In another embodiment, in which the second torque-speed characteristic is assigned to the Eco mode, the operator activates the first input device when, for example, they accept a telephone call in the middle of the preparation of a dish or in an extractor hood running in normal mode want to lead another, especially short conversation in the kitchen. At the end of the conversation, the operator may then continue to cook, and after the period of time has elapsed, the cooker hood will again provide the required extraction power in normal mode.

According to a further embodiment, a second input device is provided for an input of a user who is set up to set the time span. The user can thus adjust the time span according to his wishes.

According to a further embodiment, the time period is permanently predetermined on a memory. This is preferable for example in low-cost extractor hoods, since then no second input device must be provided.

According to a further embodiment, a third input device is provided for an input of a user, which is adapted to determine the shape of the second torque-rotational speed characteristic in dependence on the input of the user. This allows the user to decide individually whether the second torque-speed curve should correspond, for example, to a boost, power or eco mode of the extractor hood. The third input device may be provided, for example, to display the various modes to the user on a screen so that they can easily select.

According to a further embodiment, the first and second torque-rotational speed characteristic have at least one common point. By this is meant that the torque-speed characteristics in a first area (at least one point) have an identical torque-speed value pair or an identical course and in a second area a different torque-speed-value pair or a different course. Thus, for the second torque-speed curve no new "stage" must be created, but it is sufficient if the second torque-speed curve deviates in sections from the first torque-speed curve. The thus defined second torque-speed characteristic curve may correspond to the power mode if it is at least partially above the first torque-speed characteristic curve, or to the eco mode if it lies at least partially below the first torque-speed characteristic curve ,

According to a further embodiment, the first and second torque-rotational speed characteristic do not have a common point. Thereby, a second torque-speed characteristic can be provided, which deviates completely from the first torque-speed characteristic and thereby provides a completely different behavior of the hood. Such a torque-speed characteristic curve may correspond, for example, to the boost mode. In that regard, for example, a positive boost mode, in which the second torque-speed curve over the first torque-speed curve, and a negative boost mode is conceivable in which the second torque-speed curve is below the first torque speed Characteristic curve lies.

According to a further embodiment, the control device is adapted to additionally control the fan motor with a third torque-speed characteristic. The third torque-speed characteristic has no common point with the first or second torque-speed characteristics. For example, the third torque-speed characteristic may be, for example, a normal mode of a second operating stage of the extractor hood.

According to a further embodiment, the first, second and / or third torque-rotational speed characteristic curve has an asynchronous characteristic, wherein the asynchronous characteristic preferably comprises a tightening torque, a caliper torque, a tilting moment and / or a nominal rotational speed. The asynchronous characteristic is characterized by the fact 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 volume of air conveyed through the extractor hood and a casing connected downstream of any of the extractor hood, if any, remains the same with greater air resistance. 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 and second torque-speed characteristics have the same tightening torque, the same fifth-wheel torque and / or the same rated rotational speed and a different tilting torque. This corresponds to a second torque-speed characteristic which has at least one common point with the first torque-speed characteristic.

According to a further embodiment, the first, second and / or third torque-rotational speed characteristic curve differ from each other with respect to their tightening torque, fifth wheel torque and / or overturning moment. This is particularly suitable in the case in which the first torque / speed characteristic curves a normal mode of a first operating stage, the third torque / rotational speed characteristic a normal mode of a second operating stage and the second torque / rotational speed characteristic a Boost Mode corresponds.

According to a further embodiment, the first, second and / or third torque-rotational speed characteristic are shifted parallel to each other. Thus, the torque-speed characteristics can be easily defined.

According to a further embodiment, when the extractor hood of the first torque-speed characteristic is used as intended, a first displacement-pressure difference characteristic curve, the second torque-speed characteristic curve a second displacement-pressure difference characteristic and / or the third torque-speed characteristic third delivery volume pressure difference characteristic assigned. The delivery volume is the air volume (including any vapor), which per unit time the extractor hood and any associated with this piping by means of the blower motor is promoted. 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 venturi downstream of the pressure chamber. If the fan motor is driven, for example, with the first torque / speed characteristic curve, depending on an internal resistance of the extractor hood (recirculation mode) or in addition a resistance of the hood connected to the extractor hood (exhaust air operation), a delivery volume and a pressure difference. This value pair corresponds to an operating point of the fan motor referred to herein as the 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 pressure difference of the second delivery volume-speed characteristic for each delivery volume is greater than or equal to the pressure difference of the first delivery volume-speed characteristic. Additionally or alternatively, the pressure difference of the third delivery volume-speed characteristic for each delivery volume is greater than or equal to the pressure difference of the first and second delivery volume-pressure difference characteristic.

The extractor hood is preferably designed as a household appliance.

Furthermore, a method for operating an extractor hood, in particular the extractor hood described above, is provided. In this case, an electrically commutated fan motor is controlled by a control device as a function of a time signal provided by a timer with a first torque-speed characteristic or with a second torque-speed characteristic.

The embodiments and features described with respect to the extractor hood apply mutatis mutandis to the method.

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

Further possible implementations of the invention also include not explicitly mentioned combinations of features or embodiments of the extractor hood and of the method 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 curves 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-rotational speed characteristic DK1 is, for example, a normal mode of a first operating stage 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 the air resistance of the 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 recognize 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 For example, it can automatically decide that it is the blower motor in the exhaust air mode 14 with the delivery volume-pressure difference characteristic line FK1 corresponding torque-speed characteristic DK1 and in the recirculation mode, 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 recirculation mode, in the house is due to the existing air filter to work 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 becomes a timer 27 (Timer) from a non-triggered mode thereof in a triggered mode thereof switched. In non-triggered mode, the timer sets 27 the control device 21 the blower motor 14 a first time signal t ₁ ready. When the time signal t _{1 is provided} , the control device controls 21 the blower motor 14 For example, with the torque-speed characteristic DK1, which corresponds to the delivery volume-pressure difference characteristic FK1 and thus the normal mode of the first operating stage "1", as already mentioned above. It can be provided that the timer 27 automatically with switching on the extractor hood 1 , ie by pressing a button 23 , which is assigned to one of the operating levels "1" to "4", is in the non-triggered mode. In triggered mode, on the other hand, the timer sets 27 the control device 21 a second time signal t ₂ ready. When provided time signal t ₂ controls the controller 21 the blower motor, for example, with the torque-speed characteristic DK3, resulting in the corresponding delivery volume-pressure difference characteristic FK1e, which corresponds to the boost mode. In triggered mode, the timer counts 27 now up to one on a memory 28 the same amount of time saved. When the time span has elapsed, it has expired and the timer 27 automatically switches back to non-triggered mode, ie without user interaction. The time span can be, for example, 10 seconds.

The boost button 26 So the operator can then press, if just a particularly large amount of vapor over the hob 3 arises. Then it turns the hood 2 a higher take-off performance and then automatically returns to normal mode. This results in a comfortable operation for the operator.

It can be provided that the operator person the time on the memory 28 by means of the touchscreen 25 can enter according to individual wishes. In cost-effective hood models, however, can be provided that the period of software fix on the memory 28 , that is not changeable, is provided. Accordingly, then no relatively expensive input device 25 be provided to allow adjustment of the period.

Alternatively, it can also be provided that the control device 21 when provided second time signal t _2, the blower motor 14 not with the torque-speed characteristic DK3 corresponding to the boost mode, but with, for example, the torque-speed characteristic DK1a corresponding to the power mode. Thus, the operator person also receives an increased withdrawal rate, but with a different characteristic.

Further alternatively it can be provided that the control device 21 when provided second time signal t _2, the fan motor 14 with the Eco-mode corresponding torque-speed characteristic DK1b drives. This reduces the noise of the cooker hood 2 , This makes sense, for example, if the operator person to accept a phone call in the kitchen or any other, especially short conversation in the kitchen would like to lead.

Furthermore, it can be provided that the operator person via the touch screen 25 the mode, so for example, the boost, power or Eco mode, can be selected with provided second time signal t ₂ .

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

28

 Storage

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

t ₁

 time signal

t ₂

 time signal

UB

 recirculation mode

Claims (15)

Extractor hood ( 2 ) with an electronically commutated blower motor ( 14 ), a timer ( 27 ) for providing a time signal (t ₁ , t ₂ ) and a control device ( 21 ), which is adapted to the blower motor in response to the provided time signal (t ₁ , t ₂ ) with a first torque-speed characteristic (DK1) or with a second torque-speed characteristic (DK1a, DK1b, DK3) to control , Extractor hood according to claim 1, characterized in that the timer ( 27 ) a non-triggered mode in which it is adapted to the control device ( 21 ) to provide a first time signal (t ₁ ), and a triggered mode in which it is adapted to the control device ( 21 ) provide a second time signal (t ₂ ), and that the control device ( 21 ) when the first time signal (t ₁ ) is provided, the blower motor ( 14 ) with the first torque-rotational speed characteristic (DK1) and when the second time signal (t ₂ ) is provided, the blower motor ( 14 ) with the second torque-speed characteristic (DK1a, DK1b, DK3) controls. Extractor hood according to claim 2, characterized by a memory ( 28 ) for storing a time span and a first input device ( 26 ) for an input of a user who is set up the timer ( 27 ) from the non-triggered mode to the triggered mode, whereby the timer ( 27 ) automatically returns from the triggered mode to the non-triggered mode at the end of the time span. Extractor hood according to claim 3, characterized by a second input device ( 25 for an input of a user who is adapted to set the time period. Extractor hood according to claim 3, characterized in that the time span in the memory ( 28 ) is fixed. Extractor hood according to one of claims 1-5, characterized by a third Input device ( 25 for input of a user who is adapted to set the shape of the second torque-speed characteristic (DK3) in response to an input of the user. Extractor hood according to one of claims 1-6, characterized in that the first and second torque-speed characteristic (DK1, DK1a, DK1b) have at least one common point. Extractor hood according to one of claims 1-6, characterized in that the first and second torque-speed characteristic (DK1, DK3) have no common point. Extractor hood according to one of claims 1-8, characterized in that the control device ( 21 ) is adapted to the blower motor ( 14 ) in addition to a third torque-speed characteristic (DK2) to control, and that the third torque-speed characteristic (DK2) no common point with the first and / or second torque-speed characteristic (DK1, DK1a, DK1b, DK3 ) having. Extractor hood according to one of claims 1-9, characterized in that the first, second and / or third torque-speed characteristic (DK1; DK1a, DK1b, DK3; DK2) has an asynchronous characteristic, wherein the asynchronous characteristic is preferably a tightening torque (M _A1 , M _A3 , M _A2 ), a fifth wheel torque (M _S1 , M _S3 , M _S2 ), a tilting moment (M _K1 , M _K3 , M _K2 ) and / or a rated speed (n _N ). Extractor hood according to claim 10, characterized in that the first and second torque-rotational speed characteristic (DK1, DK1a, DK1b) the same tightening torque (M _A1 ), the same saddle torque (M _S1 ) and / or the same rated speed (n _N ) and have a different tilting moment (M _K1 , M _K1a , M _K1b ). Extractor hood according to claim 10, characterized in that the first, second and / or third torque-speed characteristic (DK1, DK3, DK2) with respect to their tightening torque (M _A1 , M _A3 , M _A2 ), saddle moments (M _S1 , M _S3 , M _S2 ) and / or tilting moments (M _K1 , M _K3 , M _K3 ) differ from each other. Extractor hood according to one of claims 1-12, characterized in that the first, second and / or third torque-speed characteristic (DK1, DK3, DK2) are mutually displaced in parallel. Extractor hood according to one of Claims 1-13, characterized in that, when the extractor hood of the first torque / rotational speed characteristic (DK1) is used as intended, a first displacement / pressure difference characteristic (FK1), the second torque / rotational speed characteristic (DK1a, DK1b , DK3) a second delivery volume-pressure difference characteristic (FK1a, FK1b, FK1e) and / or the third torque-speed characteristic (DK2) is associated with a third delivery volume-pressure difference characteristic (FK2). Method for operating an extractor hood ( 2 ), in particular an extractor hood ( 2 ) according to any one of claims 1-14, wherein an electronically commutated blower motor ( 14 ) depending on one by means of a timer ( 27 ) provided time signal (t ₁ , t ₂ ) with a torque-speed characteristic (DK1) or with a second torque-speed characteristic (DK1a, DK1b, DK3) from a control device ( 21 ) is driven.

Images