WO2002007579A1 - Vacuum cleaner - Google Patents

Abstract

The invention relates to a vacuum cleaner comprising an electric motor (1), a suction channel (4), a pressurised channel (5), and a secondary air channel (6), whereby the secondary air channel opens according to the temperature in the pressurised channel (5). The aim of the invention is to protect the electric motor from overheating with little mechanical effort, by electronically activating a regulating body (8) used to open the secondary air channel (6).

Description

00001 vacuum cleaner 00002

The invention initially relates to a vacuum cleaner

00004 an electric motor, a suction channel, a pressure channel

00005 and a secondary air duct, depending on the

00006 temperature in the pressure channel an opening of the secondary air

00007 channel is done. 00008

00009 vacuum cleaners of the type in question are known.

00010 is problematic in certain cases

00011 Cooling of the engine, especially when

00012 gene, for example in the area of the dust filter.

00013 Such a blockage means that the suction

00014 air flow, which usually also the cooling of the electrical

00015 tromotors takes over, is too low. Known solutions

00016 have a permanent secondary air opening, so

It is dimensioned sufficient that even with constipation

00018 air can flow in. Solutions are also known

00019 where vacuum or temperature controlled valves

00020 can be opened or the power electronically reduced

00021 is adorned. Principal disadvantage of a permanent

00022 opening is that even during normal operation secondary

00023 air is sucked in, so that the efficiency of the device

00024 it drops. Known temperature or vacuum control

Valves of 00025 have been found to be disadvantageous in that

00026 that these solutions due to the spatial separation

00027 of temperature measurement and installation location of the valve in

00028 are generally mechanically complex. An electronic

00029 see power reduction until the device is switched off

00030 tes leads to irritation of the user because of this

00031 does not recognize that reducing or switching off

00032 is wanted to protect the device and never

00033 represents a defect. 00034 00035 With regard to the state of the art

00036 nik becomes a technical problem of the invention

Seen in 00037 a vacuum cleaner of the type in question

00038 type, in which protection against overheating

00039 of the electric motor with little mechanical effort

00040 is realized. 00041

00042 This task is first and foremost

00043 object of claim 1 solved, wherein

00044 is that the activation of an actuator for

00045 opening of the secondary air duct takes place electrically. To the

00046 Protection against overheating becomes secondary air for cooling only

00047 supplied when the suction flow in the device is too low

00048 will. Therefore, the temperature of the protected

00049 components, in particular of the electric motor, by means of electrical

00050 tronic temperature sensors monitored. Only with over-

00051 step a suitably defined temperature limit

Secondary air is added, preferably by

00053 that a secondary air valve of the secondary air duct is opened

00054 will. According to the invention, the temperature is preferred

00055 by means of a suitable sensor, e.g. B. an NTC or

00056 PTC, monitored in the critical area. When exceeding

00057 th of a limit temperature, an actuator is opened

00058 net. The latter closes one in a basic position

00059 opening of the secondary air duct on the suction side.

00060 The closure is done by an actuator, which in the

00061 cold state of the component to be monitored, for example the

00062 electric motor, the opening of the secondary air duct

00063 covers. If the temperature rises above the limit, so

00064 the actuator is actuated, which actuation counter

00065 does not mechanically over the known prior art

00066 lever and linkage or pneumatically using vacuum

00067 lines, but is done electrically. As a result of this

00068 configuration are temperature information of the

00069 monitoring component used to create a spatially 00070 remote actuator for opening the secondary air duct

00071 to control. Due to the electrical

00072 see activation of the actuator hardly arise

00073 Restrictions regarding the location of the egg

00074 door sensor and actuator, further limit values exactly

00075 can be met. Another advantage is

00076 that the secondary air duct is opened by the electrical

00077 see activation of the actuator without time delay

00078 takes place. In this regard, it has proven to be advantageous

00079 further that an electrically actuated bimetal

00080 actuator is provided. This or a meme

00081 orymetall becomes when the limit temperature is exceeded

00082 electrically heated until it deforms and the

00083 air duct opening releases. The temperature drops again

00084 below the limit value, the heating of the Bi-Me-

00085 talls ended, so that this closes the opening again

00086 closes. Alternatively, an electrically operated one

00087 magnetic actuator can be provided, which

00088 exceed the limit temperature electrically controlled

00089 is and the secondary air duct opening opens. Of

00090 further an electrically operable piezo actuator

00091 gan, an electro-chemical actuator or an actuator

00092 gan be provided in the form of a servo motor. By

00093 the electrical activation of the actuating

00094 organs can also cover greater distances between

00095 gan and temperature measuring point in the simplest way

00096 can be bridged so that other

00097 doors exposed components, such as filters, plastic

00098 housing parts or electronic components, which in

00099 air flow path are protected. in this connection

00100 can measure body temperature. thinking

00101 bar is, however, also the measurement of the suction flow air temperature

00102 temperature in the immediate vicinity of the components to be protected

00103 le. In addition, evaluation electronics are proposed

To provide 00104, which is constructed discretely or as 00105 microcontroller is formed. These evaluation elec-

00106 tronik processes sensor signals which correspond to the temperature

00107 of the component to be monitored corresponds to

00108 input side and then performs a target / actual value

00109 same with fixed or variable limit values

00110 th through. If the limit is exceeded, a

00111 switching signal for the actuator for opening the secondary

00112 air duct generated. The actuator or the secondary

00113 air duct can basically be placed anywhere on the

00114 pressure side of the electric motor may be provided; prefers

00115 however behind an engine protection filter. 00116

The invention further relates to a vacuum cleaner

00118 an electric motor, a suction channel, a pressure channel

00119 and a secondary air duct, depending on

00120 pressure in the suction duct an opening of the secondary air duct

00121 is done. Such 'vacuum cleaners with secondary air duct are

00122 well known. To such a vacuum cleaner

To further develop 00123 in an advantageous manner is suggested

00124 gene that the activation of an actuator for opening

00125 of the secondary air duct takes place electrically. Such

00126 embodiment proves particularly when used

00127 an attachment nozzle on the vacuum cleaner advantageous. Height

00128 pushing forces of such a nozzle or other attachment

00129 rates are linked to high negative pressures in the suction

00130 in front of the filter chamber. If the value for the

00131 vacuum in front of the filter chamber a preset

00132 limit value, then a corresponding control signal for

00133 generated the opening of the secondary air duct, with the

00134 ge that the pushing force decreases. Is an attachment

00135 te detection available, this can be done individually for

00136 each front attachment with different limit values

00137 done. It also proves advantageous that

00138 an electrically actuable bi-metal actuator

00139 can be seen, which is exceeded when a preset 00140 set pressure limit is electrically heated until

00141 this by deforming the secondary air duct opening

00142 releases. Alternatively, an electrically operated

00143 bar magnet actuator can be provided. Are further

00144 also electrically actuable piezo actuators, electro

00145 chemical actuators and servo motor actuators

00146 settable. 00147

The invention further relates to a vacuum cleaner

00149 an electric motor, a suction channel, a pressure channel

00150 and a secondary air duct, depending on the

00151 temperature in the pressure channel an opening of the secondary air

00152 channel is done. To make an improvement here

00153 a protection against overheating of components, e.g.

00154 of the electric motor, it is proposed that

00155 the secondary air duct is opened via negative pressure

00156 and that the electric motor depending on the temperature

00157 door in the pressure channel adjustable to a higher speed

00158 is. To protect against overheating, secondary air is used to

00159 cooling supplied only when the suction flow in the device

00160 is too low. Therefore the temperature of the

00161 components using electronic temperature sensors

00162 monitors. Only suitable if one is exceeded

00163 defined temperature limit value, secondary air is added

00164 leads in such a way that a secondary air valve

00165 controls is opened. The switching point of the valve,

00166 d. H. the negative pressure at which the valve opens is so

00167 dimensioned that this means no regular applications

00168 can be influenced. Generally the valve opens

00169 for higher vacuum values. Will the vacuum cleaner

00170 but operated at a low power setting

00171 ben, there is severe blockage of the air

00172 flow path, for example. When the

00173 filter chamber the risk that the electric motor of the

00174 vacuum cleaner overheats because in this low 00175 level the switching threshold for the secondary air valve

00176 is not reached and therefore does not open to

00177 to let in cooling secondary air. Erfindungsge-

00178 damage is measured by overheating at low

00179 power positions avoided by the fact that the temperature

00180 door on the endangered components, e.g. on the electrical

00181 engine, is monitored by a temperature sensor.

00182 If a temperature limit is reached, this opens

00183 vacuum-controlled valve the secondary air duct, and

00184 is due to the fact that the vacuum cleaner is electronic

00185 is brought to a performance level at which

00186 accordingly negative pressure is generated to the switching threshold

To exceed 00187 of the valve with the result that the

00188 valve opens. Activation of the valve or one

00189 actuator for opening the secondary air duct can

00190 at electrically done, further as an actuator

00191 a bimetal or a magnet activator can be provided

00192 can. In addition, piezo, electro-chemical

00193 see and servo motor actuators conceivable. Through the

00194 A solution according to the invention is sensed and

00195 guards the temperature-sensitive components, for. B. with-

00196 means of electrical sensors. The temperature information

00197 NEN are used to locate a distant

00198 valve to open, the control of the valve

00199 not mechanically, but via negative pressure in front of the engine

00200 is done. In an advantageous development of the

00201 object of the invention can be provided that the

00202 secondary air duct is closed by a flap that

00203 when a threshold vacuum is exceeded

00204 net. For example, this can be an in

00205 Closure direction spring-supported, around an axis

00206 act swiveling closure flap. 00207

The invention also relates to a vacuum cleaner with a

00209 electric motor, a suction channel, a pressure channel and 00210 a secondary air duct, depending on the

00211 temperature in the pressure channel an opening of the secondary air

00212 channel takes place, with further pressure detection in the

00213 suction channel takes place. The performance of vacuum cleaners with

00214 the goal of dust absorption especially on hard floors

I

00215 and low-pile carpets will maximize

00216 ever increased. With these high air performance

00217 gen also increases on deep-pile carpets

00218 pushing force to high values. It is in this regard

00219 solutions known in which automatic positions

00220 are provided, which depending on the vacuum in

00221 device regulate the power consumption of the motor. at

00222 ever increasing power consumption of vacuum cleaner

00223 like to increase the effort for cooling the engine

00224 in the event that the device or dust filter is

00225 and thereby the suction air flow, which is usually

00226 se the cooling, for example. ^"The electric motor, over-

00227 takes too little. With the well-known automatic

00228 the negative pressure is usually in the area

00229 tapped behind the filter chamber. With deep-pile

00230 carpets the vacuum in the device increases. Becomes a

00231 certain threshold value is exceeded, then

00232 nisch the power consumption reduced. Has a disadvantage

00233 that this reduction in performance - and that too

00234 automatic increase in user performance

00235 leads to irritation. The above disadvantages will

00236 countered by the invention by opening the

00237 _. Secondary air duct with combined consideration of

00238 a temperature value, for example the temperature in the pressure

00239 nal, the volume flow in the suction or pressure channel and the

00240 Pressure drop at the filter chamber. Through the

00241 solution according to the invention is not, as in the prior art

00242 technology known, the power consumption of the electric motor

00243 changed, but specifically an actuator for opening

00244 of the secondary air channel controlled, preferably by a 00245 electrical activation of the actuator. This can

00246 this actuator a servo motor for continuous

00247 Opening a secondary air duct flap. Furthermore

00248 are also bi-metal, magnetic, piezo or even electro

00249 chemical actuators conceivable. The signal for that

00250 actuator is derived from a map, which

00251 is stored in a microcontroller. This

00252 map is preferably determined by the negative pressure

00253 behind the filter chamber, the negative pressure in front of the filter

00254 chamber, the temperature of components at risk and

00255 optional threshold values that can be influenced by the user.

00256 It can further be provided that a

00257 volume flow meter is arranged. It also proves

00258 is advantageous that in the suction channel before and

00259 a pressure meter is arranged behind the filter chamber,

00260 where it can further be provided that the negative pressure

00261 in the suction channel independently for evaluating the pressure drop

00262 on the filter chamber to open the secondary air duct

00263 is used. It also proves to be advantageous

00264 that the measured vacuum with the power

00265 adjustment of the electric motor and / or with a pre

00266 set device is adjusted. From the determined data

00267 can be the pushing force of the attachment from the

00268 pressure in front of the filter chamber, the degree of filling of the filter

00269 mer from the pressure drop across the same and the temperature

00270 exposure of components at risk, such as the electromotive

00271 tors, determine via temperature sensors and via the

00272 map the optimal opening of the secondary air duct

Calculate 00273. It follows that the user for everyone

00274 floor coverings always the optimal suction power available

00275 gung without the pushing force becoming too high.

00276 At the same time, the protection of the device against overheating

00277 guaranteed. User irritation

00278 audible fluctuating power consumption are due to the

00279 solution according to the invention excluded. The suction line 00280 stung is opened according to the invention by opening the secondary air

00281 nals regulated, the speed of the electric motor

00282 remains approximately the same. Through temperature detection

00283 by means of sensors is protection against damage due to

00284 heating of the components to be protected, for example at a

00285 Constipation reached. If a saved temperature

00286 temperature limit reached or exceeded, this is done

00287 a signal to open the secondary air duct. About that

00288 the degree of filter filling is also determined by means of the pressure

00289 if detected on the filter chamber, whereby here

00290 a signal for a stored limit value

00291 electrical, mechanical, optical or acoustic

00292 The filter change is displayed. As mentioned, will

00293 preferably also the volume flow measured in the suction channel

00294 sen. In the known prior art, the pressure

00295 fall on the filter chamber among other things from the volume flow

00296, which has the disadvantage that

00297 a correct display only for a certain volume

00298 stream, d. H. at a certain service level and

00299 for a specific front attachment and operating status

00300 is possible. By knowing the volume flow

00301 can be the absolute in the solution according to the invention

00302 Blockage of the filter chamber calculated and displayed

00303, regardless of the operating state, i.e. H. the

00304 Power position of the electric motor and the type of

00305 front attachment. The calculation is done via

00306 a map stored in a microcontroller. Height

00307 are pushing forces of the nozzle or other attachments

00308 coupled to high negative pressure in the suction paths before

00309 filter chamber. Exceeds the negative pressure value

00310 a preset limit value in front of the filter chamber,

00311 is a corresponding control signal for opening

00312 of the secondary air duct, whereupon the sliding

00313 power drops. With a header detection

00314 this individually for each front attachment with different 00315 limit values. By integrating the

00316 volume flow, the total delivered quantity is determined

00317 tel. This value comes with a preset value

00318 compared. If this value is exceeded, a

00319 Signal for changing additional filters, e.g. odor filters

00320 or fine filter generated. When changing the filter

00321 the integrator is reset to zero.

00322 Has the user set an operating state at

00323 which the actuator of the secondary air duct is open

00324 and / or the power controller of the electric motor not

00325 is set to maximum power, so with the

00326 signals the increasing filling of the filter

00327 chamber and the resulting decrease in the suction line

00328 are compensated for by an appropriate access

00329 ren of the secondary air duct. Is the latter closed and

00330 the device is not in maximum power position, it can

00331 displayed to the user in a higher performance

00332 stage to switch. This increase is also conceivable

00333 of the power level to be carried out automatically,

00334 where the values to be considered from the map

00335 can be derived. 00336

00337 The invention is based on the attached

00338 drawing, which only several execution examples

00339 le represent, explained in more detail. It shows: 00340

00341 Fig. 1 is a schematic representation of an electromotive

00342 tors with a suction channel, a pressure channel and

00343 a secondary air duct for a vacuum cleaner,

00344 relating to a first embodiment; 00345

00346 FIG. 2 shows a representation corresponding to FIG. 1,

00347 however concerning a second embodiment; 00348 00349 FIG. 3 shows another illustration corresponding to FIG.

00350 lung, relating to a third embodiment; 00351

00352 FIG. 4 in a fourth embodiment, the inventions

00353 subject matter in a representation according to

00354 Fig. 1 showing. 00355

00356 is shown and described initially with reference to

00357 FIG. 1 an electric motor 1 for a not shown

00358 set vacuum cleaner on which electric motor 1

00359 arranged by this driven impeller 2

00360 is. The blower unit thus formed is included

00361 number 3. 00362

00363 In the suction direction r, the blower unit 3 is a suction

00364 nal 4 and behind the blower unit 3, a suction channel 5th

00365 arranged. 00366

00367 In the suction channel 4, i.e. H. in the suction direction r before the

00368 blower unit 3 opens a secondary air duct 6, the

00369 opening 7 on the suction channel side by means of an actuator 8

00370 is closed in a basic position according to FIG. 1. 00371

00372 The suction air flow also cools the

00373 electric motor 1. malfunctions, such as blockages,

00374 can, however, reduce the suction

00375 air flow cause sufficient cooling of the

00376 electric motor 1 is no longer given. To here the

00377 To protect the electric motor from damage caused by overheating

00378 the temperature in the suction flow direction r behind the

00379 electric motor 1, d. H. in the area of the pressure channel 5

00380 by means of a temperature sensor 9, for example in the form of a

00381 NTC. The determined temperature value is in

00382 a control / evaluation unit 10 with a predetermined

00383 actual value compared. If the determined temperature 00384 tur a predetermined target value, so a signal

00385 generated to open the secondary air duct. 00386

00387 The temperature detection can be done by measuring the body

00388 temperature or by measuring the suction flow air

00389 Temperature in the immediate vicinity of the electric motor 1

00390 or other components to be protected.

00391 Other components at risk from high temperatures

00392 can, for example, filters, plastic housing parts or

00393 be electronic components. The evaluation electronics in the

00394 control / evaluation unit 10 can be constructed discretely or

00395 can also be designed in the form of a microcontroller,

00396 being a limit value for generating a control signal

00397 preset for opening the secondary air duct 6

00398 or can also be a variable value. 00399

00400 The opening 7 of the secondary air duct 6 can basically

00401 any on the negative pressure side of the electric motor 1 in

00402 region of the suction channel 4 may be arranged, however

00403 preferably an arrangement behind a motor protection filter

00404 is selected. 00405

00406 That the opening of the secondary air duct 6 initially

00407 closing actuator 8 is according to the invention

00408 trically activated, which means that they are also spatially distant

00409 en, through actuator 8 and auxiliary air duct opening 7

00410 formed valves are controllable. 00411

00412 In the exemplary embodiment shown, the actuating

00413 organ 8 provided in the form of a bi-metal actuator 11

00414 hen, which when the limit temperature is exceeded

00415 is heated electrically until it releases the

00416 secondary air duct opening 7 deformed (see dash-dotted

00417 te representation in Fig. 1). If the temperature drops

00418 due to the cooling air sucked in via the secondary air duct 6 00419 is below the limit again, the heater 12

00420 of the 'bi-metal actuator 11 turned off so that

00421 a provision of the actuator under closing

00422 of the opening 7 takes place. , 00423

00424 It is an alternative to the actuator 8 shown

00425 also conceivable to provide a magnetic actuator, which

00426 electrically activated when the limit temperature is exceeded

00427 is controlled and the auxiliary air duct opening 7 is

00428 there. In addition, there are also piezo elements or

00429 electro-chemical actuators conceivable as actuators. 00430

00431 A further embodiment is shown in FIG.

00432 in which a pressure sensor 25 in the suction channel 4

00433 the present pressure measured and in a control / off

00434 unit 10 is evaluated. About the latter

00435 from a predetermined limit value the actuator 8 elec-

00436 trisch controlled to open the secondary air duct 6.

00437 An actuator 8 is shown here in the form of a

00438 by means of a servo motor 13 pivotable valve

00439 flap 14. However, solutions of the

00440 actuator 8 according to the first embodiment,

00441 d. H. in the form of a bi-metal actuator 11, one

00442 magnetic actuator or an actuator in the form of a

00443 piezo element or an electro-chemical actuator. 00444

00445 in the embodiment according to FIG. 3 is used for protection against

00446 an overheating of the electric motor 1 the temperature in

00447 flow direction r behind the same, d. H. in the print box

00448 nal 5, recorded, this by means of an electronic temperature

00449 temperature sensor 9. If a suitably defi

00450 temperature limit becomes cooling secondary air

00451 fed by a, the secondary air duct opening 7

00452 closing actuator 8 vacuum-controlled opened

00453 net. The switching point of the actuator 8, ie 00454 the required negative pressure at which an opening is

00455 follows, is set so high that no regular

00456 applications can be influenced. In general

00457 opens at higher vacuum values. Becomes

00458 the vacuum cleaner but with a low power

00459 position operated, so there is a constipation

00460 the risk that the electric motor overheats, because in

00461 this low power level the switching threshold of

00462 actuator 8 is not reached and thus this

00463 does not open to allow cooling secondary air to flow in ^;

00464 sen. 00465

00466 In order to avoid damage, secondary air must be

00467 leads. Will be in a small power level of

00468 electric motor reached the temperature limit, see above

00469, the vacuum-controlled actuator 8 against the

00470 spring force of the 'actuator 8 in the locking position

00471 lung acting spring 30 opened, this

00472 requires that the electric motor 1 by means of control

00473 via the control / evaluation unit 10 into a power

00474 level is spent, at which sufficient accommodation

00475 pressure is generated to the switching threshold of the actuator

00476 Goose 8 to be exceeded. 00477

00478 Fig. 4 shows a solution in which an opening of the

00479 secondary air duct 6 under combined consideration

00480 from a temperature value in pressure channel 5 for detection

00481 the temperature of the electric motor 1, the volume flow in

00482 suction channel 4 and the pressure drop across a filter chamber

00483 15 takes place. 00484

00485 To detect the pressure drop across the filter chamber 15

00486 are in the suction channel 4 in front of and behind the filter chamber

00487 15 pressure sensors 16, 17 are provided, the pressure sensor

00488 sor 17 behind the filter chamber 15 and a volume flow 00489 knife 18 in the flow direction r in front of the opening 7 of the

00490 secondary air duct 6 are placed. 00491

00492 Via the pressure sensor 16, the vacuum in the

00493 Suction channel 4 independently for evaluating the pressure drop

00494 used on the filter chamber 15. 00495

00496 The values recorded via sensors 9, 16, 17 and 18

00497 are a control / evaluation unit 10 in the form of a

00498 microcontroller supplied and there with a deposited

00499 th map compared. As further parameters for

00500 evaluation of the signals are used to set the

00501 electric motor 1 regulating power controller (arrow 19)

00502 and, if applicable, the signal of a header detection

00503 voltage (arrow 20). 00504

00505 From the value measured by the pressure sensor 16

00506 of the filter chamber 15 is the pushing force of the attachment

00507 advisable. If the value for the sub-

00508 pressure in front of the filter chamber 15 a preset

00509 limit value, then a corresponding control signal

00510 (arrow 21) for opening the actuator 8, which

00511 in the form of a servo motor, a bi-metal actuator

00512 it, a magnetic actuator or in the form of a piezo

00513 element or an electro-chemical actuator

00514 can be generated, whereupon the pushing force

00515 drops. Is a header detection (arrow 20)

00516 available, this can be done individually for each

00517 advises that different limit values be used.

00518

00519 By integrating a volume flow determination

00520 determines the total amount of air delivered. This

00521 value is compared with a preset value.

00522 If this value is exceeded, for example, a signal

00523 generated to change the odor or fine filter 00524 (arrow 22). When changing the filter, a

00525 The integrator was reset to zero. 00526

00527 About the determined pressure drop across the filter chamber 15

00528 the fill level of the filter chamber is to be determined. He-

00529 the pressure drop reaches a stored value, so

00530 a signal (arrow 23) is generated to indicate the

00531 necessary filter change. This display can be electrical,

00532 mechanically, optically or acoustically.

00533 By knowledge of the volume flow meter 18

00534 determined volume flow can the absolute block

00535 the filter chamber 15 is calculated and displayed

00536 den, regardless of the operating state, d. H. of the

00537 power position of the electric motor 1 and type of the pre

00538 set device. The calculation is done via the

00539 map in the control / evaluation unit. 00540

00541 Has the user set an operating state at

00542 which the actuator 8 is open and / or the

00543 Power divider not set to a maximum position

00544 is, so with the available signals

00545 increasing filling of the filter chamber 15 and the resulting

00546 resulting decrease in suction power compensated

00547 are closed by closing the actuator

00548 it 8. Is this closed and the electric motor 1

00549 is not operated in the maximum position, the user can

00550 zer displayed in a higher power level too

Switch 00551. Such an increase in the power level

00552 can also be done automatically via the map. 00553

00554 For components at risk, such as the electric motor 1,

00555 against damage from overheating due to constipation

00556 etc. to protect, is via the temperature sensor 9 in

00557 Dependency on a stored limit value 00558 Signal (arrow 21) to open the secondary air duct 6

00559 generated. 00560

00561 By the inventive solution shown in FIG.

00562 solution, a steady

00563 ge setting of the optimal suction power reached.

00564 This setting of the suction power takes place via a

00565 from the actuator 8 and the auxiliary air duct opening 7

00566 formed valve. In addition, all sizes are

00567 before to the pressure loss of the filled filter chamber 15th

00568 to determine and the suction power indicator / filter change

00569 display to control. 00570

00571 All disclosed features are (in themselves) inventive

00572 considerably. In the disclosure of the application,

00573 with also the disclosure content of the associated / attached

00574 th priority documents (copy of the pre-registration)

00575 fully included, also for the purpose of

00576 times of these documents in claims of the present application

00577 to take with fertilizer. 00578

Claims

00579 00580 CLAIMS 00581 00582 1. Vacuum cleaner with an electric motor (1), a suction 00583 nal (4), a pressure channel (5) and a secondary air channel 00584 (6), depending on the temperature in the 00585 pressure channel (5) an opening of the secondary air channel (6) 00586, characterized in that the activation 00587 an actuator (8) for opening the secondary air duct 00588 (6) takes place electrically. 00589 00590 2. Vacuum cleaner according to claim 1 or in particular there- 00591 according to, characterized in that an electrically operated 00592 tigable bi-metal actuator (11) is provided. 00593 00594 3. Vacuum cleaner according to one or more of the preceding 00595 according to the claims or in particular according thereto, 00596 shows that an electrically actuated magnetic actuator 00597 organ is provided. 00598 00599 4. Vacuum cleaner according to one or more of the preceding 00600 according to the claims or in particular according thereto, 00601 shows that an electrically actuable piezo actuator 00602 organ is provided. 00603 00604 5. Vacuum cleaner according to one or more of the preceding 00605 according to the claims or in particular according thereto, 00606 shows that an electrically actuable electro-chemical 00607 mixing actuator is provided. 00608 00609 6. Vacuum cleaner according to one or more of the preceding 00610 according to the claims or in particular according thereto, 00611 shows that an electrically actuable servo motor 00612 actuator (13) is provided. 00613 00614 7. Vacuum cleaner with an electric motor (1), a suction 00615 nal (4), a pressure channel (5) and a secondary air channel 00616 (6), depending on the pressure in the suction channel 00617 (4) the secondary air duct (6) is opened so that 00618 characterized in that the activation of an actuating 00619 organs (8) for opening the secondary air duct (6) 00620 trisch done. 00621 00622 8. Vacuum cleaner according to claim 7 or in particular 00623 according to, characterized in that an electrically operated 00624 tigeable bi-metal actuator (11) is provided. 00625 00626 9. Vacuum cleaner according to one or more of claims 7 00627 to 8 or in particular thereafter, characterized in that 00628 that an electrically actuated magnetic actuator 00629 is provided. 00630 00631 10. Vacuum cleaner according to one or more of the claims 00632 7 to 9 or in particular thereafter, characterized 00633 net that an electrically actuated piezo actuator 00634 is provided. 00635 00636 11. Vacuum cleaner according to one or more of the claims 00637 7 to 10 or in particular thereafter, characterized 00638 net that an electrically actuable electro-chemical 00639 cal actuator is provided. 00640 00641 12. Vacuum cleaner according to one or more of the claims 00642 7 to 11 or in particular afterwards, characterized thereby 00643 net that an electrically actuated servo motor actuator 00644 organ is provided. 00645 00646 13. Vacuum cleaner with an electric motor (1), a suction 00647 duct (4), a pressure duct (5) and a secondary air duct 00648 nal (6), depending on the temperature in 00649 the pressure channel (5) an opening of the secondary air channel (6) 00650, characterized in that the opening of the 00651 secondary air duct (6) via negative pressure and that 00652 the electric motor (1) depending on the temperature in 00653 pressure channel (5) can be regulated to a higher speed. 00654 00655 14. Vacuum cleaner according to claim 13 or in particular 00656 after that, characterized in that the secondary air duct 00657 (6) is closed by a flap (14) which at 00658 Exceeding a threshold vacuum opens. 00659 00660 15. Vacuum cleaner with an electric motor (1), a suction 00661 duct (4), a pressure duct (5) and a secondary air duct 00662 nal (6), depending on the temperature in 00663 the pressure channel (5) an opening of the secondary air channel (6) 00664 takes place, with further pressure detection in the suction 00665 nal, characterized ^* that an opening 00666 of the secondary air duct (6) under combined consideration 00667 supply of a temperature value, for example the temperature in the 00668 pressure channel (5), the volume flow in the suction (4) or 00669 pressure channel (5) and the pressure drop at the filter chamber 00670 (15). 00671 00672 16. Vacuum cleaner according to claim 15 or in particular 00673 after that, characterized in that in the suction channel 00674 (4) a volume flow meter (18) is arranged. 00675 00676 17. Vacuum cleaner according to one or more of the claims 00677 15 to 16 or in particular afterwards, characterized thereby 00678 net that in the suction channel (4) in front of and behind the filter 00679 terkammer (15) a pressure meter (18) is arranged. 00680 00681 18. Vacuum cleaner according to one or more of the claims 00682 15 to 17 or in particular afterwards, characterized thereby 00683 net that the vacuum in the suction channel (4) independent 00684 for evaluating the pressure drop across the filter chamber 00685 (15) used to open the secondary air duct (6) 00686 will. 00687 00688 19. Vacuum cleaner according to one or more of the claims 00689 15 to 18 or in particular afterwards, characterized thereby 00690 net that the measured vacuum with the power 00691 position of the electric motor (1) and / or with a pre 00692 set device is adjusted. 00693 00694 20. Vacuum cleaner according to one or more of the claims 00695 15 to 19 or in particular afterwards, characterized thereby 00696 net that the volume flow measurement can be integrated. 00697 00698 21. Vacuum cleaner according to one or more of the claims 00699 15 to 20 or in particular afterwards, characterized thereby 00700 net that the integrated value of the volume flow measurement 00701 depending on a comparison value for signal generation 00702 gung is used.