WO1995028122A1

WO1995028122A1 - Vacuum cleaner with suction power indicator

Info

Publication number: WO1995028122A1
Application number: PCT/EP1995/001147
Authority: WO
Inventors: Carsten Jacobs; Helmut SCHÖNHOFF; Jan Thomas Krapp
Original assignee: Vorwerk & Co. Interholding Gmbh
Priority date: 1994-04-15
Filing date: 1995-03-27
Publication date: 1995-10-26
Also published as: DK0755216T3; ATE166554T1; EP0755216B1; DE59502352D1; DE4413225A1; ES2117417T3; EP0755216A1; AU2214895A

Abstract

The invention relates to a vacuum cleaner (1) with a blower (10), a filter bag (9) and a suction power indicator (14) which is controlled by detecting the pressure difference; in order to fit a vacuum cleaner as claimed with an indicator which indicates the relative suction power independently of the attachment used and thus also of the effective air passage, it is proposed that the pressure difference be derived from the depression in a suction channel (28) upstream of the filter bag (9) and the overpressure downstream of the blower (10).

Description

00001 vacuum cleaner with a suction power indicator

00002 00003

00004 The invention relates to a vacuum cleaner with a fan.

00005 se, a filter bag and a suction power indicator,

00006 which is controlled by a detection of a pressure difference

00007 will. 00008

00009 Vacuum cleaners are known, in general

00010 as an indicator of the increasing clogging of the filter

00011 prey due to vacuumed up dust from the throttle

00012 Effect of the filter material caused pressure drop

00013 can be used on the filter bag. This pressure

00014 waste is generated by means of analog or digital work

00015 ads shown as a feature of filter clogging.

00016 under the limitation of constant blower output and

00017 constant nozzle processing point is this display

00018 correct. Devices with variable motor power can

00019 Displays only the pressure drop across the filter bag

Consider 00020, correct only in one working point

Show 00021. In general, this is the point max. Engine-

00022 power, so that at a smaller selected power

00023 a filter clogging that is too small is displayed. moreover

00024 is for a change in the work screen for

00025 blower, such as. B. by different floors and

00026 to an even greater extent by changing the working nozzle

00027 is caused, the display error occurring

00028 exclusive measurement of the differential pressure over the

00029 filter bag even bigger. Both clean and

00030 if the filter bag is clogged, the pressure drop changes

00031 above the filter bag when changing the suction attachment in 00032 to a large extent.

00033

00034 object of the present invention is to provide a gate

00035 to provide vacuum cleaner according to the invention, 00036 regardless of the front attachment used and thus

00037 also the relative suction

00038 shows power. 00039

This problem is solved by the main claim

00041 specified invention. 00042

00043 The subclaims represent advantageous developments

00044. 00045

Due to this configuration it is achieved that

00047 the relative regardless of the attachment used

00048 suction power is displayed. This is because of it

00049 achieved that the pressure difference from the negative pressure in

00050 a suction channel in front of the filter bag and the overpressure

00051 is formed after the blower. It follows from this

00052 in a vacuum cleaner with variable motor power, one

00053 Display of the current suction power of the device, which in

00054 dependence on the preset engine power and

00055 the fill level of the filter bag, but independently

00056 of an upstream attachment always the relative

00057 ve indicates suction power. One is preferred here

00058 embodiment in which the decrease in pressure after the blower

00059 se, but before subsequent flow resistances and

00060 possibly takes place before a blow-out filter element. With clean

00061 rem filter bag and max. Blower output is independent

00062 a display value of 100%

00063 is enough. With a clean filter bag and reduced fan

00064 power is also a corresponding

00065 reduced value is displayed. With increasing sales

00066 tamping the filter bag, the displayed value

00067 accordingly. In this case, for smaller work panels,

00068 greater relative suction power are displayed than for

00069 larger f-number, since the air speeds z.

00070 B. in a crevice nozzle even when largely blocked 00071 filter bags are still high enough to collect dust

00072 men. The vacuum in the suction channel in front of the fan and the

00073 positive pressure after the blower are in one device

00074 detects which ana-

00075 log or digital the current, relative suction power

00076 displays. Such a device can

00077, for example, be designed so that the suction line

00078 display from an addition of the absolute values of the

00079 two pressures results. If a max.

00080 blower capacity, the two pressures add up to one

00081 suction power display of 100%. Will the fan power

00082 reduced to half, this results in a

00083 correspondingly reduced vacuum in the suction channel and

00084 a reduced overpressure after the fan, the addi-

00085 tion gives an indication of the suction power of 50%. Developed

00086 based on a preset max. Fan performance

00087 This occurs when the filter

00088 a drop in the vacuum in the suction channel. The

00089 adding the pressures results in a smaller value,

00090 which is displayed, for example a

00091 instantaneous, relative suction power of 80%. Will be under

00092 another attachment with these given circumstances

00093 upstream of a smaller work panel, so leads

00094 this leads to an increase in the air speed in the loading

00095 rich of the suction channel, which also means the negative pressure in the suction

00096 channel increases, while reducing the overpressure

00097 kes after the blower. However, the latter does not sink in

00098 same dimensions as the overpressure in the suction channel increases.

00099 This leads to a higher result of adding the

00100 pressures than the original, larger work sheet

00101 en, which also means a greater relative suction power

00102 display is brought. This is also desirable because

00103 attachments with a small work screen, such as. B.

00104 a crevice nozzle, even with a largely blocked filter

00105 bags the air speed is still high enough 00106 to pick up dust. In an advantageous further training

00107 fertilizer of the subject matter of the invention it is provided that

00108 negative pressure a correction factor is applied. This

00109 can be realized, for example, in that

00110 device in which the absolute values of the pressures ad

00111 dated, the value of the vacuum a spring pressure

00112 opposite a ring spring or the like

00113 will. The display is advantageously an analog display

00114 ge trained. Here the training can be made

00115 be that the pressures on the opposite surfaces

00116 a closed, movable depending on the pressures

00117 NEN disc are switched. The position of the movable

00118 disc within the device can, for example,

00119 se can be recognized by means of a viewing window, with which

00120 an analog display is given. The display device

00121 can be designed so that it can, for example,

00122 se is a cylinder in which the disc can move freely

00123 is stored. To the two opposite

00124 surfaces of the disc act on the one hand the vacuum in

00125 the suction channel and on the other hand the overpressure after

00126 blower. To seal the pressures used against each other

00127 other can be used for example bellows

00128 den. Depending on the preset blower output and filling

00129 degrees of the filter bag and the pressures dependent thereon

00130 the disc assumes a position in the cylinder,

00131 which is recognized, for example, via a viewing window

00132 can be, which can be provided with a scale.

00133 To display, especially when the vacuum cleaner is switched off

00134 to move the disc in a basic position,

00135 which basic position indicates a performance display of 0%

00136 acts, it is further provided that the disc

00137 is spring-loaded on one side. It is advantageous

00138 finally provided that the correction factor by

00139 different connection surfaces for the two pressures

00140 on the opposite sides of the disc 00141 represents. The connection surfaces on the opposite

00142 the surfaces of the disc can for example be chosen 00143 so that the surface on which the overpressure after the

00144 blower acts, is larger than the surface,

00145 acts on the negative pressure in the suction channel. Prefers

00146 is a training in which the connection surfaces

00147 circular, corresponding to the cylindrical shape of the pre

00148 direction, are shaped. With such a trained

00149 suction power display calculates the display value

00150 by adding the absolute values of the vacuum

00151 in the suction duct and overpressure behind the fan,

00152 which overpressure multiplied by the correction factor

00153 is. The latter in turn is calculated from the square

00154 the pressure gauge ratios of the two pads

00155 to each other. 00156

00157 The invention is further based on the

00158 attached drawing, which, however, is only an embodiment

00159 illustrates example. Here shows: 00160

00161 Fig. 1 a vacuum cleaner according to the invention with a

00162 suction line arranged in a device housing

00163 display, 00164

00165 FIG. 2 shows a schematic illustration of the device housing.

00166 ses, partially broken open, for illustration

00167 the arrangement of the suction power display in the

00168 device housing, 00169

00170 Fig. 3 shows a detail of the device housing

00171 in the area of the suction power display, 00172

4 shows the section along the line IV-IV in FIG. 3, 00174 00175 Fig. 5 is a diagram showing the principle

00176 course of a negative pressure in a suction channel

00177 before a blower and an overpressure after

00178 the blower and 00179

00180 Fig. 6 different display characteristics of the suction line

00181 status display. 00182

00183 The vacuum cleaner 1 shown is designed as a handheld device.

00184 piert. It has a housing 2, to which a top

00185 handle 3 connects with end handle 4. In

00186 transition area between handle 4 and handle 3

00187 there is a power potentiometer 5, which

00188 on the one hand for switching the vacuum cleaner on and off

00189 on the other hand for variable blower motor power setting

00190 lung serves. The electrical cable connection is with the number

00191 6. 00192

00193 The housing 2 is divided into a motor housing 7 and

00194 an extending chamber 8 for receiving

00195 of a filter bag 9. In the motor housing 7 that is

00196 blower 10 arranged, which by means of a blower motor

00197 tors 11 is driven (see. Fig. 2). 00198

00199 The motor housing 7 goes into a pipe coupling on the underside

00200 12 via which the air flow connection to a suction

00201 produces nozzle 13. 00202

00203 With regard to the suction nozzle 13, it is shown in the

00204 th example of a so-called suction / brush nozzle, the

00205 contains a brush roller in the nozzle mouth, which has a

00206 separate drive is set in rotation. There are

00207 other attachments can also be used, such as

00208 as a crevice nozzle or an upholstery nozzle. 00209 00210 The blower motor 11 is downstream of the filter bag 9.

00211 tet and works in a known manner, therefore sucks

00212 the dust air through the above the motor housing 7

00213 falling filter bag 9, which directly

00214 via a suction channel 28 with a pipe coupling 12

00215 passing suction channel is connected. 00216

00217 The blower 10 is also a blow-out filter 32

00218 downstream, via which the cleaned air after

00219 occurs outside. 00220

00221 The cross section of the housing 2 is consistently long rectangular

00222 kig with weakly developed broad sides and

00223 chen narrow sides. In Fig. 1 is the vacuum cleaner of the

00224 narrow side. 2 shows a partial

00225 broken view on a broadside. 00226

00227 In the area of the narrow side of the housing shown in FIG. 1

00228 ses 2 is arranged in this a suction power indicator 14

00229 net. 00230

00231 the latter consists essentially of a cylindrical

00232 body 15, in which a movable, closed

00233 disk 16 is mounted. On the opposite

00234 surfaces 17, 18 of the disk 16, pressures are switched,

00235 as a result of which the disk 16 is dependent on the pressures

00236 positioned within the cylindrical body 15. to

00237 readability of the current position of the disc 16

00238 inside the cylindrical body 15 has the latter

00239 a slot-shaped opening 19 through which a

00240 on the disc 16 arranged pointer 20 engages. 00241

00242 The cylindrical body 15 is immediately behind the

00243 housing wall of the motor housing 7 arranged. In loading

00244 rich of the slot-shaped opening 19 of the cylindrical 00245 see body 15, the motor housing 7 has a view

00246 ster 21, whereby the current position of the disc 16

00247 can be recognized from the outside with the aid of the pointer 20. 00248

00249 For improved readability, the

00250 window 21, i.e. H. in the display area of the pointer 20

00251 the outer surface of the cylindrical body 15 a scale

00252 or the like is provided. 00253

00254 The end face of the body has 15 cylindrical sockets

00255 22,23 for connecting pressure lines 24,25, one

00256 pressure line 24 leads to a connection point 26, which

00257 behind the blower 10, but in front of the blow-out filter 32

00258 is arranged. The pressure line 25, however, leads to

00259 a connection point 27 in the area of the pipe coupling

00260 12 with the suction channel 28 connecting the filter bag 9. 00261

00262 To seal the pressures used within the

00263 cylindrical body 15 against each other are bellows

00264 used ge 29.30. These each extend from

00265 the part of the protruding into the cylindrical body

00266 nozzle 22 or 23 starting up to the respective

00267 bellows 29,30 facing surfaces 17 and 18 of the

00268 disc 16. 00269

00270 The sealing of the pressures against each other can also

00271 for example through membranes or through adapted cylinder

00272 guides for the different piston diameters

00273 can be achieved. 00274

00275 The circular areas 17, 18 are of different sizes

00276 trained. It can be seen from Fig. 4 that the

00277 radius of the pad 17 is approximately twice as large

00278 as that of the pad 18. Due to the area ratio

00279 nis of large and small piston diameter or 00280 a correction factor is determined. This

00281 is calculated by the square of the ratio of

00282 large to small diameter. 00283

00284 The sealing of the pressures against each other can also

00285 for example by membrane or by adapted cylinder

00286 guides for the different piston diameters

00287 aims to be. 00288

00289 In the area of the bellows 30 there is also one

00290 compression spring 31 which is located at one end of the

00291 inside of the cylindrical body 15 in the area of

00292 support 23 and at the other end on the disc 16.

00293 It includes the bellows 30. This compression spring

00294 31 serves as an auxiliary spring to achieve a basic

00295 tion of the suction power indicator 14, according to that in FIG. 4

00296 position shown. 00297

00298 The negative pressure in the suction

00299 nal 28 in front of the filter bag 9 and via the pressure line

00300 24 the overpressure after the blower 10, but before the

00301 flow resistances and the blow-out filter 32

00302 on the respective connection surfaces 17 or 18 of the

00303 be 16 switched. Depending on the size of the pressures or depending on

00304 Height of the pressure difference, the disc 16 moves

00305 gene of the spring force of the compression spring 31 from the in Fig. 4th

00306 shown starting position in one of the relative

00307 suction power corresponding position. In the shown

00308 Starting position is, for example, the one shown

00309 Value of the suction power indicator 14 on the scale 0%. at

00310 max. Deflection of the pointer 20, i. H. at max. Various

00311 exercise of the disc 16 in the direction of the nozzle 23

00312 a suction power of 100% is displayed. 00313 00314 The two pressures, ie the negative pressure in the suction channel 28

00315 in front of the filter bag 9 and the positive pressure behind the

00316 blower 10 are linked, the display value

00317 A from the addition of the absolute value of the negative pressure

00318 P _s and the overpressure P ^, which with the correction factor

00319 tor K is multiplied, results. 00320

00321 Due to this configuration, a suction power

00322 display 14 given, regardless of the

00323 set device (suction / brush nozzle, crevice nozzle etc.) the rela-

00324 tive suction power analogously to the display. With clean

00325 rem filter bag and max. Blower output is independent of the aperture specified by the attachment

00327 reached an ad value of 100%. With a clean filter

00328 bag 9 and less, by the power potentiometer

00329 5 preset blower output is also blown

00330 regardless of a correspondingly reduced value

00331 shows. With increasing blockage of the bags, the

00332 devalued accordingly, whereby with smaller work sheets

00333 which shows a larger relative suction power

00334 than with larger f-numbers because the air speed

00335 keiten z. B. in a crevice nozzle also largely

00336 clogged filter bag 9 are high enough to dust

00337 record. 00338

00339 The basic course of the pressures in a vacuum cleaner

00340 ger 1 over the volume flow gamma is in Fig. 5 in

00341 shown an example. Here is the characteristic

00342 of the positive pressure after the fan 10 with P ^.

00343 The characteristic curve P _s ι shows the course of the negative pressure in the

00344 suction channel 28 with preset max. Performance and

00345 new filter bag 9. One parallel to this characteristic

00346 shifted further characteristic curve P _s 3 shows the course of the

00347 negative pressure also with new filter bag 9, however

00348 with preset min. Fan motor power 11. 00349 Finally, a characteristic curve P _s 2 is shown, which

00350 the course of the vacuum with preset maxi-

00351 painting performance and clogged filter bag 9 represents. 00352

00353 The diagram is based on two specified volume flows

00354 e gamma 'and gamma' 'explained in more detail, the volume

00355 flows in direct dependence on the f-number of the

00356 are used front attachment. 00357

00358 With a volume flow gamma 'add up with

00359 max. Blower power and new filter bag 9 die

00360 absolute values of the negative pressure P _s ι and the positive pressure

00361 P, -}. The values are included in the diagram for the absolute

00362 th negative pressure value and with b for the absolute positive pressure

00363 value entered. With a reduction in the default

00364 set fan power to a minimum shifts

00365 the characteristic of the negative pressure parallel in the direction of

00366 zero (curve P _{_s.} 3 - It can be seen that

00367 the absolute vacuum value a3 decreases. The

00368 addition of ai and b or a3 and b results in the

00369 absolute value of the total pressure, which is directly in the

00370 suction power indicator 14 on the on the disc 16

00371 brought pointer 20 to be displayed, being here

00372 not the absolute pressures, but rather the

00373 performance is displayed in percent - furthermore is

00374 at a selected volume flow gamma ',

00375 that with a preset max. Fan performance and

00376 stuffed filter bag 9 the characteristic of the negative pressure P _s 2

00377 runs such that an absolute value a2 results, the

00378 lies in size between the absolute values a and a3. 00379

00380 A reduction in the volume flow has, as from the

00381 diagram can be seen in FIG. 5, a reduction in the

00382 overprint Pςj with simultaneous increase of the respective

00383 negative pressure P _s result. With an assumed volume 00384 ström gamma '' result in absolute negative pressure

00385 te a •, a2 • and a3 - for the respective cases. It's closed

00386 recognize that the result of an addition of the absolute values

00387 te with a volume flow rate gamma '' is greater than with

00388 addition of the absolute values at a volume flow gamma '.

00389 This is especially true when, for example, how

00390 represented by the characteristic curve P _s 2, a max. Fan-

00391 performance is preset and the filter bag 9

00392 is largely filled. Here the absolute

00393 ten values a3 • and b 'to an absolute pressure value, the

00394 is greater than when the absolute values a2 are added

00395 and b in the case of a volume flow gamma '. hereby

00396 shows a larger relative suction power at

00397 same preset fan power and stop

00398 efficiency of the filter bag 9. This is desirable because

00399 the air speeds z. B. in a crevice nozzle too

00400 with largely clogged filter bag 9 still sufficient

00401 to pick up dust. The relative suction line

00402 stung of the vacuum cleaner 1 with a filled filter bag 9th

00403 is therefore larger at smaller f-numbers than at

00404 larger f-numbers. 00405

00406 is simplified in the diagram shown in FIG

00407 way the dependence on preset blower

00408 stung, degree of filling of the filter bag 9 and the f-number

00409 B of the attachment shown for the display value A. There are

00410 four characteristics shown here, one with K-

00411 display characteristic is designated, with preset

00412 max. Blower output and new filter bag 9. The characteristic

00413 line K3 shows the course at a preset min.

00414 blower capacity and new filter bag 9. With K2 and K4

00415 are display characteristics that indicate the display

00416 runs with filled filter bag 9, where

00417 with K2 the maximum fan power, with K4 the minimum

00418 fan power is preset. 00419 By choosing the correction factor already mentioned

00420, the characteristic of the suction power display 14

00421 adapt to the desired display characteristics. So that's it

00422 Fig. 6 to recognize that the characteristic curves ^~~~ and K3 are independent

00423 depending on the f-number, one display value each

00424 ben, which is the preset value of the fan power

00425 corresponds. This means that with a preset max.

00426 fan power the suction power indicator 14 accordingly

00427 of the characteristic curve Y. \ regardless of the f-number

00428 indicates a relative suction power of 100%. correspond

00429 the display falls a little lower with the preset

00430 min. Blower output. Here is independent of the

00431 f-number always a value of the relative suction power

00432 of 50%, for example. 00433

00434 With preset max. Blower output and filled

00435 filter bag 9, the characteristic curve K2 is dependent

00436 from the f-number B. It can be seen that the display

00437 value A always below the display value when empty

00438 filter bag 9 (characteristic \) lies, with the display

00439 the relative suction power with a smaller f-number

00440 is larger than with a larger f-number. The characteristics

00441 line K4 (preset min. Blower output and adjusted

00442 stuffed filter bag 9) is essentially the same as

00443 Characteristic curve K2 - The curve is flatter than

00444 for the latter. It can also be seen here that the display

00445 ge the relative suction power always below the value

00446 is the characteristic curve K3 and that with a small f-number

00447 a larger relative suction power is displayed. 00448

00449 The in the above description, the drawing and

Features of the invention disclosed in the claims can

00451 both individually and in any combination for

00452 the realization of the invention may be of importance.

00453 All disclosed features are essential to the invention. In 00454 the disclosure of the application is hereby also

00455 disclosure content of the associated / attached priori

00456 full documents (copy of pre-registration)

00457 included. 00458

Claims

00459 claims 00460

00461 1. vacuum cleaner (1) with a blower (10), a filter

00462 bag (9) and a suction power indicator (14), the

00463 is controlled by recording the pressure difference,

00464 characterized in that the pressure difference from the

00465 negative pressure (P _s ) in a suction channel (28) in front of the filter

00466 bag (9) and the positive pressure (P ^) after the blower (10)

00467 is formed. 00468

00469 2. Vacuum cleaner according to claim 1 or in particular according thereto,

00470 characterized in that the decrease in pressure after the

00471 blower (10), but before subsequent flow resistance

00472 stands and possibly in front of a blow-out filter element (32)

00473 is done. 00474

00475 3. Vacuum cleaner according to claim 1 or in particular according thereto,

00476 characterized in that the negative pressure (P _s )

00477 correction factor (K) is activated.

00478

00479 4. Vacuum cleaner according to one or more of the preceding

00480 according to the claims or in particular according thereto,

00481 shows that the suction power indicator (14) is an analog

00482 display is. 00483

00484 5. Vacuum cleaner according to one or more of the preceding

00485 the claims or in particular according thereto, characterized

00486 shows that the pressures (P _s and P ^) on the opposite

00487 lying surfaces (17, 18) depending on the

00488 Pressures (P _s and P ^) movable, closed disc

00489 (16) are switched. 00490

00491 6. Vacuum cleaner according to one or more of the preceding 00492 claims or in particular according thereto, characterized 00493 shows that the washer (16) is spring-loaded on one side

00494 strikes. 00495

00496 7. Vacuum cleaner according to one or more of the preceding

00497 the claims or in particular according thereto, characterized

00498 records that the correction factor by different

00499 connecting surfaces (17, 18) for the two pressures (P _s and

00500 P, -]) on opposite sides of the disc (16)

00501 is set.