DE202009010260U1 - Extractor hood, especially for the household - Google Patents

Abstract

Extractor hood, especially for domestic use, comprising:
A frame (10);
- A frame (10) associated with the motor unit (19) for the extraction of air;
- A control unit (30) to control at least the operation of the motor unit (19);
- a supply circuit (50) adapted to be connected to an outdoor supply network (60) to receive the electrical supply from the latter and to supply the electrical supply to at least the motor unit (19);
wherein the feed circuit (50) is adapted to provide at the output a predetermined feed which is independent of the feed supplied by the feed network (60) to the feed circuit (50).

Description

The The present invention relates to a fume hood, in particular for the household. As is known, the hoods in generally provided with a housing, which expediently Air filter means, one or more soundproofing panels and at least one engine associated with the air extraction over the filter media and the discharge of air over causing a duct that blocks the air outside the room leads, in which the hood is located.

at the fume hoods of known type is the motor used for recording electrical energy typically on a substantially immediate Way connected to the food network.

Of the Motor is also assigned to a control unit, the depending on any command given by a user, the working strength of the engine itself, for example via one or more switches provides that are used to provide the engine itself determined performance. The engine is sized that there are different windings in its interior, which allow for selective feeding, different rotational speeds of the engine itself.

One Disadvantage of the currently available hoods refers to the fact that the various in the Elevator cover contained electrical elements (such as said drive) specifically depending on the features of the supply network must be executed and measured that is used in the geographical area in which the fume hood is used.

For example must be at a destination specific to a particular country Extractor hood designed the electrical components be that they are fed with an alternating current of 120 V, 60 Hz can.

A certain extractor hood for the market of another country on the other hand, an alternating current supply of 230 V, 50 Hz.

This is clear disadvantages in the complexity of Provision of hood constructions, of execution different products depending on the market, for which they are to be determined.

Further Disadvantages refer to the commercial administration, the logistics, interventions after the sale and management of spare parts, according to the different product lines with each other electrical properties clearly difficult and complex.

The Object of the present invention is to provide a Extractor hood, especially for the household, its operation of the voltage-frequency characteristics of the electric feeder network the country in which the extractor hood itself will be operated, is free.

A Another object of the present invention is a fume hood to deliver the use of a single common platform For products required for different markets are determined.

A Another object of the invention is to provide a fume hood, the significant savings from the point of view of commercial Administration, logistics, interventions after the sale and the Management of spare parts allows.

A Auxiliary object of the invention is the supply of a fume hood, which is characterized by high electrical efficiency. A Another auxiliary object of the invention is the provision a fume hood that stands a high energy savings both under by Conditions as well as under normal operating conditions allowed.

These and further tasks are essentially a fume hood, in particular for the household, in accordance with what is described in the attached claims is solved.

Further Features and benefits are closer to the description a preferred and therefore not limiting embodiment a hood according to the invention.

The Description follows below with reference to the attached Drawings that are just a pure example and therefore not possess limiting character. Show it:

1 schematically an end view of a hood according to the invention, partly in section;

2 a block diagram of a part of the hood 1 ,

With reference to the accompanying drawings is with 1 Overall, a fume hood, in particular for the household according to the present invention specified.

The extractor hood 1 includes above all a frame 10 , which expediently air filter means 11 , possibly one or more noise-insulating panels 12 and an aesthetic body 15 can be assigned.

The extractor hood 1 is formed such that the air filter means 11 Filter the sucked air and any soundproofing panels 12 allow a limitation of the sound, which is caused by the hood itself in their mode of operation.

The extractor hood 1 is also with a functional unit or with a drive unit 19 provided the frame 10 is assigned and causes the air intake.

• – Gleichstrom- oder Wechselstrommotor;
• – Synchron- oder Asynchronmotor;
• – Motor mit Dauermagneten oder ohne Dauermagneten;
• – Motor mit oder ohne elektronischer Umschaltung;
• – Motor ohne Bürsten oder mit Bürsten;
• – Induktionsmotor oder ohne Anker;
• – Frequenzkontrollierter Motor;
• – Spannungskontrollierter Motor;
• – Stromkontrollierter Motor.

Via a convenient channel 13 The sucked air is then brought outside the room in which the hood is located. The functional unit preferably comprises 19 an engine 20 which may be an electric motor; for example, the electric motor may belong to one or more of the following categories;

• - DC or AC motor;
• - synchronous or asynchronous motor;
• - motor with permanent magnet or without permanent magnet;
• - motor with or without electronic switching;
• - motor without brushes or with brushes;
• - induction motor or without armature;
• - frequency controlled motor;
• - Voltage controlled engine;
• - Current controlled motor.

The engine used 20 can be dimensioned to work with a very low safety voltage (SELV).

It should be noted that in the present context, for simplicity, to a single motor 20 Reference is made.

However, it should be emphasized that the fume hood 1 may also be provided with a plurality of motors or drives, each having substantially similar features to those described with respect to the motor described herein 20 to be discribed.

The extractor hood 1 also includes a control unit 30 ( 2 ) to at least the operation of the engine 20 adjust.

In particular, the control unit 30 be formed to the operating power of the engine 20 adjust.

Only purely, for example, different operating strengths can be provided, that is, different take-off levels of the hood 1 , depending on different modes of operation / modalities of the engine 20 correspond; Moreover, a system is provided which is capable of continuously changing the mode of operation of the motor unit itself.

Preferably, the control unit sees in dependence on a command C activated by a user 30 before, the operation and in particular the suction strength of the engine 30 by regulating the power supplied to it in the same way.

The user has the option of commands C via a user interface 31 adjust with the control unit 30 connected is; the user interface 31 may include a keyboard, a series of capacitive sensors, a touchscreen, or any other means that is suitable for the commands C of the control unit 30 transferred to.

Advantageously, the control unit 30 comprise a microprocessor. which is expediently programmed in such a way that the control functions described here are handled.

The extractor hood 1 also includes a supply circuit 50 which is suitable with an outdoor food network 60 to be connected to receive from this latter the electrical supply and the electrical supply to at least the motor 20 to deliver.

Preferably, the supply circuit 50 also with the control unit 30 connected to the latter to supply the electrical supply.

In particular, supplies the supply circuit 50 at the output a given supply, which is independent of the supply, that of outdoor supply network 60 is delivered.

In other words, is the feeding circuit 50 suitable to receive at the input an AC voltage which may be between 70 V and 280 V and in particular between 80 V and 265 V; the frequency of such an input supply can be between 50 Hz and 60 Hz.

Regardless of how the supply is received at the input, the supply circuit provides 50 at the output a supply with predetermined characteristics, in connection with the voltage and the frequency.

Advantageously, the supply circuit 50 at the output a voltage of the type SELV (Safety Extra Low Voltage).

The definition of "SELV voltage" is in the reference standard for the safety of low voltage electrical appliances IEC / EN 60335-1 delivered.

In practice, this is at the output of the supply circuit 50 Preferably, the voltage supplied is between 0 V and 42 V and, as stated above, a voltage may be SELV.

The basic principle on which the operation of the supply circuit 50 (Stepping down) is called PWM (Pulse Width Modulation), namely modulation of the pulse width.

The at the entrance of the feeding circuit 50 received supply voltage is rectified above all (rectifier 51 ) and by means of a capacitor 52 smoothed. Subsequently generates an oscillation circuit 54 from this DC voltage, an AC voltage in the form of a series of pulses, at a high, constant frequency, spaced from each other by a time T and a ratio between the time the pulse is ON (TON) and the time , in which the impulse is zero (T _OFF ), called "Duty Cycle". This voltage "with the variable duty cycle" (modulation PWM) is applied to the terminals of the primary winding of a transformer 55 applied; the voltage at the output of the type SELV connected to the terminals of the secondary winding of the transformer 55 is applied, is rectified (rectifier 56 ) and smoothed (condenser 57 ).

The stabilization function of the output voltage of the supply circuit 50 is obtained by retroactively reimbursing the error of the output signal against a reference value REF.

In particular, is the circle of tension 50 with a scanning module 58 the voltage at the output from the supply circuit 50 himself and with a comparison module 59 Mistake; this latter provides, through the scanning module 58 to compare detected voltage with a predetermined value REF.

The difference "between these values, also called" errors ", is at the input of the oscillation circuit 54 so that the latter can change the duty cycle of the generated square wave depending on the difference between the detected voltage and the reference value.

For example, in the case where the voltage at the output from the supply circuit 50 is less than the reference REF, the duty cycle is increased, while in the case where the voltage at the output from the supply circuit 50 is greater than the reference value REF, the duty cycle is reduced.

Of the mentioned comparison between the voltage read at the output and the corresponding reference value REF can be both digital, via a Microprocessor, as well as analogously over a convenient provided analogous circuit.

The feeding circle 50 can have different, independent outputs in such a way that the power supply to a control system 52 the drive unit 19 (described in more detail below) the user interface 31 that can be supplied to the eventual lighting and the eventual sensors, that of the fume hood 1 belong.

The fact that the outputs of the supply circuit 50 can be different means that each output can supply a different supply than the other outputs as needed, which must be fed.

In any case, deliver the entire outputs of the supply circuit 50 preferably a voltage of the type SELV.

Preferably, as stated above, the fume hood comprises 1 moreover, an engine control system 52 ,

The engine control system 52 manages the output of the supply circuit 50 and allowed over the control unit 30 , the functional unit 19 according to the typology of the motor (s) 20 to dine.

The engine control system 52 can have a voltage SELV at the input and the output.

Advantageously, the engine control system 52 the output of the supply circuit 50 To allow the control of engines of different typologies with or without feedback (frequency control, etc.).

In practice it is about the feeding circuit 50 the ventilating motor unit 19 a supply supplied, whose characteristics are determined depending on the feeding motor unit.

For example, the engine control system 52 include an inverter that goes beyond the supply circuit 50 is fed and information about the operating mode of the motor unit 19 from the control unit 30 receives.

Advantageously, said Inver ter in communication with a brushless motor 20 be provided, this latter in the motor group 19 is included.

In one embodiment (not illustrated), the engine unit 19 a supply directly from the supply circuit 50 and commands directly from the control unit 30 without, therefore, the use of the engine control system 52 would be provided.

In the preferred embodiment, the control unit 30 also for the control of others, the fume hood 1 associated devices / circuits may be provided, such as: the lighting system of the hood 70 , one or more sensors 80 that at least partially automatic operation of the hood 1 Provide a message module 90 to the wireless signals (to a remote control of the functionalities of the fume hood 1 to allow) to send / receive the user interface 31 and any display that belongs to it, and so on.

Advantageously, the supply circuit 50 , the engine unit 19 and the control unit 30 inside the frame 10 be included; for clarity is in the 1 but only the engine unit 19 within the frame 10 shown.

The Invention achieves important advantages.

In front In particular, the operation of the hood of the properties Voltage / frequency of the electric feeder network of the country separated where the hood itself is sold.

moreover allows the execution of the invention Extractor the use of a single, common platform for products that are for different markets are determined.

One Another advantage is found in the fact that considerable Savings from the point of view of commercial administration, logistics, interventions after sale and administration the replacement parts are received.

One Another advantage of the invention is the high electrical Efficiency.

One Another auxiliary advantage of the invention relates to the high energy savings both under standard conditions and under normal conditions Operation of the hood.

One Another advantage comes from the use of the SELV voltage for the feeding of the motor forth, as the design, the planning and the choice of materials to run the engine itself one greater operational safety allowed. This translates in possession of a fume hood for kitchens, which can not have a part with high voltage, with safety the user of the hood increases under each mode of operation.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - IEC / EN 60335-1 [0038]

Claims (8)

Extractor hood, in particular for domestic use, comprising: - a frame ( 10 ); - one of the frames ( 10 ) associated motor unit ( 19 ) for the extraction of air; - a control unit ( 30 ) to at least the mode of operation of the motor unit ( 19 ) to regulate; - a supply circuit ( 50 ), which is suitable for use with an outdoor food network ( 60 ) to receive the electrical supply from the latter and the electrical supply of at least the motor unit ( 19 ) to deliver; the feeding circuit ( 50 ) is adapted to provide at the output a predetermined supply which is independent of the feed supplied by the feed network ( 60 ) the feeding circuit ( 50 ) is delivered. Exhaust hood according to claim 1, wherein the supply circuit ( 50 ), via a control unit ( 30 ) one or more engine control units ( 52 ), each of the engine control units ( 52 ) is capable of controlling various types of motors, preferably selected in one or more of the following categories: AC or DC; synchronous or asynchronous; with or without permanent magnets; with or without electronic switching; with or without anchor; with or without brushes; with frequency or voltage current control. Exhaust hood according to claim 1 or 2, in which the output of the supply circuit ( 50 ) supplied, a supply of the type SELV (Safe Extra Low Voltage) is. Extractor hood according to any one of the preceding claims, in which the motor unit ( 19 ) comprises one or more motors with low safety voltage. Extractor hood according to any one of the preceding claims, in which the motor unit ( 19 ) at least one brushless motor ( 20 ). Extractor hood according to any of the preceding claims, wherein the supply circuit ( 50 ) with the control unit ( 30 ) to provide a predetermined supply to the latter. Extractor hood according to any one of the preceding claims, in which the control unit ( 30 ) working on the motor unit ( 19 ) to control its operating strength, preferably in response to at least one command (C) activated by the user. Extractor hood according to any of the preceding claims, wherein the supply circuit ( 50 ) has a plurality of outputs, each of which is assigned to the corresponding load, the outputs of the supply circuit ( 50 ) are independent of each other.