EP2502536B1 - Ecologically efficient device for vacuum cleaning - Google Patents

Description

FIELD OF THE INVENTION

The invention relates to a device for vacuuming with a vacuum cleaner and a filter bag.

DEFINITIONS

To describe the state of the art and the invention, the following definitions and the following measuring methods are used. Unless otherwise specified in the present specification, the technical terms used within the scope of the invention are used within the meaning of the following standard.

EN 60312: EN 60312 always refers to the draft standard E DIN EN 60312-1: 2009-12.

Determination of the air data: The air data referred to in the present description, ie in particular the negative pressure and the air flow, are determined analogously to EN 60312, Chapter 5.8. For all measurements the measuring device as described in EN 60312, chapter 7.2.7 is used. For all measurements, the measuring chamber B described in EN 60312, Chapter 7.2.7.2 was used. The measuring chamber and the vacuum cleaners according to the prior art were respectively connected to the original hoses and the original pipes. In the case of the device according to the invention, the original hose of the device Siemens Z 6.0 extreme power edition and a tube with a length of 66 cm and an inner diameter of 33.5 mm was used in all embodiments. Since the aperture 8 (d ₀ = 40 mm) corresponds to the effective opening area of an average floor nozzle and thus represents practical conditions, all measurements of the air data were carried out exclusively with this aperture.

Unfilled and partially filled filter bags: In the present case, measurements are carried out on unfilled filter bags and on partially filled filter bags . A partially filled filter bag is understood to mean a filter bag that has been filled with 400 g of DMT8 test dust in accordance with EN 60312 (Chapter 5.9.1). Notwithstanding the standard, the aspiration of the test dust is not stopped as soon as one of the three conditions specified in Chapter 5.9.1.3 is reached for the first time. Rather, always 400 g of test dust are sucked in 50 g portions.

Definition and determination of the negative pressure according to EN 60312: As a vacuum to EN 60312 h ^suction _un for an unfilled filter bag and h ^suction _part for a partially filled filter bag In the present case, the values according to EN 60312 are understood, which are measured with the above setup of measuring device B, ie measuring chamber B with orifice 8, in the measuring chamber for the unfilled filter bag and for the partially filled filter bag. The instruments used to measure the vacuum must meet the requirements of EN 60312, Chapter 7.2.7.3. The negative pressure is measured in [kPa].

Definition and determination of the negative pressure in the filter bag receiving space: As a low pressure in the filter bag receiving space h ^FBAR _un for an unfilled filter bag and h ^FBAR _part of a partially filled filter bags are instruments which meet the requirements of EN 60312, chapter 7.2.7.3. The negative pressure in the filter bag holding space is measured in [kPa]. The location in the filter bag containment space where the vacuum is measured is at a location that can not be obstructed or clogged by the filter bag.

Air flow: The flow of air q _un for unfilled and q _part for the partially-filled filter bag according to EN 60312, section 7.2.7.2 of the measured with the measuring chamber B at aperture 8 underpressure h ^suction _un for an unfilled filter bag and h ^suction _part for a partially filled filter bag determined. In the prior art, this air flow is often referred to as volume flow or suction air flow.

Electrical power consumption of the motor / blower unit of a vacuum cleaner: The electrical power P ^el _un and P ^el _part with unfilled or partially filled filter bag are measured with the measuring equipment specified for measuring electrical power consumption according to EN 60335, chapter 7.2.7.3. The electrical power consumption is also measured in [W]. As already apparent from the term recording power of the motor / blower unit, electrical power consumption of other components of the vacuum cleaner device, for example, a power consumption by an electrically operated brush, in the calculation of electrical power consumption out of consideration.

Mean power consumption of the motor / blower unit of a vacuum cleaner: The average power consumption of the motor / blower unit of a vacuum cleaner in the context of the invention is an arithmetic mean of the electrical power of the motor / blower unit with unfilled and partially filled filter bag measured at aperture 8.

Degree of separation: The degree of separation in [%] in the sense of the present invention is defined by ψ = 100 - transmittance [%]. (This is not to be confused with the state of the Technique also used according to which the degree of separation is defined by: (original concentration - achieved concentration) / original concentration). The degree of separation is measured with the Model 8130 TSI Filter Tester at 86 l / min. To generate the NaCl particles, the integrated Salt Aerosol Generator 8118A is used, which generates particles with an average particle size of 0.26 μm (so-called Mean Mass Diameter).

mit

h^saug _un:

Unterdruck nach EN 60312 der Vorrichtung zum Staubsaugen bei ungefülltem Filterbeutel in [kPa],

h^fbar _un:

Unterdruck in dem Filterbeutelaufnahmeraum bei ungefülltem Filterbeutel in [kPa], und

ψ:

Abscheidegrad des Filterbeutelmaterials in [%]

Quality factor with unfilled filter bag: A criterion for the ecological efficiency of a device for vacuuming with a vacuum cleaner and a filter bag is the quality factor Q ^W _un with unfilled filter bag. This is defined as: $${\mathrm{Q}}^{\mathrm{W}}{}_{\mathrm{U.N}}=\left({\mathrm{H}}^{\mathrm{suck}}{}_{\mathrm{U.N}}/{\mathrm{H}}^{\mathrm{FBAR}}{}_{\mathrm{U.N}}\right)\times \mathrm{\psi }$$

With

h ^suck _un :

Vacuum according to EN 60312 of the device for vacuuming when the filter bag is empty in [kPa],

h ^fbar _un :

Negative pressure in the filter bag receiving space with unfilled filter bag in [kPa], and

ψ:

Separation efficiency of the filter bag material in [%]

The quality factor Q ^W _un thus results as a quotient of the negative pressure, which is established in the region of the floor nozzle of a vacuum cleaner, and the negative pressure which is generated in the filter bag receiving space directly by the motor / blower unit. In these quotients, the resistance of the filter bag is received. On the one hand, the pressure loss of the filter material is taken into account. On the other hand, the effective filter surface, the fit of the filter bag and the unfolding of the filter bag. This factor is still multiplied by the separation efficiency of the filter material to ensure that a high negative pressure in the area of the floor nozzle is not achieved by a poor degree of separation, ie a low dust particle retention.

The quality factor Q ^W _un thus provides a measure of the conversion of the negative pressure generated by the motor / blower unit in the filter bag receiving space in the negative pressure, which adjusts in the region of the bottom nozzle due to the resistance of the unfilled filter bag, taking into account the degree of separation of the material of the filter bag.

mit

h^saug _teil:

Unterdruck nach EN 60312 der Vorrichtung zum Staubsaugen bei teilgefülltem Filterbeutel in [kPa]

h^fbar _teil:

Unterdruck im Filterbeutelaufnahmeraum bei teilgefülltem Filterbeutel in [kPa], und

ψ:

Abscheidegrad des Filterbeutelmaterials in [%]

Quality factor for partially filled filter bags: As the quality factor Q ^W _un decreases when it is filled with dust, it is used as an additional or as an alternative criterion for the ecological efficiency of a device for vacuuming with a vacuum cleaner and a filter bag also the quality factor Q ^W _part with partially filled filter bag. To determine this quality factor, load an unfilled filter bag with 400 g of DMT8 test dust and then determine the quality factor in the same way as for the unfilled filter bag. This quality factor is therefore defined as $${\mathrm{Q}}^{\mathrm{W}}{}_{\mathrm{part}}=\left({\mathrm{H}}^{\mathrm{suck}}{}_{\mathrm{part}}/{\mathrm{H}}^{\mathrm{FBAR}}{}_{\mathrm{part}}\right)\times \mathrm{\psi }$$

With

h ^sucking _part :

Vacuum according to EN 60312 of the vacuuming device for partially filled filter bags in [kPa]

h ^FBAR _part:

Negative pressure in the filter bag holding space with partially filled filter bag in [kPa], and

ψ:

Separation efficiency of the filter bag material in [%]

This quality factor Q ^W _part thus represents a measure for the conversion of the negative pressure generated by the motor / blower unit in the filter bag receiving space into the negative pressure which is established in the area of the floor nozzle due to the resistance of the partially filled filter bag, taking into account the degree of separation of the material of the filter bag.

Flat bags: Under a flat bag in the sense of the present invention filter bags are understood, the filter bag wall of two individual layers of filter material with the same surface is formed such that the two individual layers are interconnected only at their peripheral edges (the term same area does not exclude of course that the two individual layers differ from one another in that one of the layers has an inlet opening).

The connection of the individual layers can be realized by a weld or adhesive seam along the entire circumference of the two individual layers; but it can also be formed by a single layer of filter material is folded around one of its symmetry axes and the remaining open peripheral edges of the resulting two partial layers are welded or glued (so-called tubular bag). With such a production three welding or gluing seams are therefore necessary. Two of these seams then form the filter bag edge, the third seam can also form a filter bag edge or lie on the filter bag surface.

Flat bags in the sense of the present invention may also have so-called gussets. These gussets can be completely unfoldable. A flat bag with such gussets is for example in the DE 20 2005 000 917 U1 shown (see there Fig. 1 with folded gussets and Fig. 3 with unfolded gussets). Alternatively, the gussets may be welded to portions of the peripheral edge. Such a flat bag is in the DE 10 2008 006 769 A1 shown (see there in particular Fig. 1 ).

Filter bags with surface folds: A filter bag whose filter bag wall has surface folds is known per se from the prior art, for example from the European patent application 10163463.2 (see there in particular Fig. 10a and Fig. 10b and Fig. 11a and Fig. 11b). If the filter bag wall comprises several surface folds, then this material is also referred to as a pleated filter material. Such pleated filter bag walls are in the European patent application 10002964.4 shown.

Fig. 1 and Fig. 2 show a filter bag in cross-section with a wall, each having two surface folds. By such surface wrinkles, the filter surface of the filter bag is increased, resulting in a higher dust holding capacity of the filter bag with higher separation efficiency and longer life results (each opposite a filter bag with the same outer dimensions and no surface wrinkles).

In Fig. 1 is a filter bag 1 with a filter bag wall 10, which has two surface folds 11 in the form of so-called dovetails shown. The filter bag is shown here in cross section through the filter bag center. The longitudinal axes of the surface wrinkles thus run in a plane which in turn is perpendicular to the plane of the drawing, and the surface wrinkles go at their longitudinal ends in the plane parallel to the drawing plane and lying before and behind the plane of the weld seams of the filter bag. Thus, the surface wrinkles can develop most in their midst. The filter bag is shown here in a state in which the surface wrinkles are already unfolded somewhat.

In Fig. 2 is a filter bag 2 with a filter bag wall 20, which has two surface folds 21 in the form of so-called triangular folds shown. The filter bag is shown here in cross section through the filter bag center. The longitudinal axes of the surface wrinkles thus run in a plane which in turn is perpendicular to the plane of the drawing, and the surface wrinkles go at their longitudinal ends in the plane parallel to the drawing plane and lying before and behind the plane of the weld seams of the filter bag. Thus, the surface wrinkles can develop most in their midst. The filter bag is also shown here in a state in which the surface wrinkles are already somewhat unfolded.

In addition to the in Fig. 1 and Fig. 2 surface wrinkles are also possible surface wrinkles with other shapes. That the surface folds in the versions after Fig. 1 and Fig. 2 perpendicular to a bag edge is not to be understood as a limitation. Of course, the surface wrinkles may also be at an angle to the edges of the bag.

Pleat fixation : The surface folds are expediently fixed inside the bag by strips of non-woven material. In FIGS. 3a and 3b It is shown how a fold fixation for dovetail folds can be made. Fig. 3a Here, the top view of a filter material web 31, which includes the dovetail folds, and one in this Fig. 3a overlying nonwoven material web 32 from which ultimately the nonwoven strips used for folding fixation are formed. From the nonwoven material web 32 (which may for example consist of a spunbonded fabric with 17 g / m ² ) rectangular holes 33 of 10 x 300 mm were punched out. Fig. 3b shows the section along the line AA in Fig. 3a , It can be seen from this sectional view that the parts of the nonwoven material web which are used for folding fixation are connected to the filter material web by means of weld lines 34. The fleece stiffener that fixes the wrinkles is in Fig. 3b for reasons of better representability slightly exaggerated bulbous drawn. In fact, the nonwoven material web 32 lies flat on the filter material web 31. In the FIGS. 3a and 3b Furthermore, the distances between the welding points and the distances between the punched holes and the web widths of the filter material web 31 and the perforated nonwoven material web 32 and the length of the welding points 34 are given in [mm].

Two layers of this consisting of the two webs 31 and 32 filter material are now superimposed and welded to a width of 290 mm to a filter bag; the remaining material of about 20 mm at each edge is cut off.

Diffusers in Vacuum Cleaner Filter Bags: Diffusers in vacuum cleaner filter bags are known in the art. The variants used here are in the EP 2 263 507 A1 described.

Filter material CS50: Laminate with downstream structure: spunbond 17 g / m ² , netting 8 g / m ² / meltblown 40 g / m ² / spunbond 17 g / m ² / PP staple fibers 50 to 60 g / m ² / carded staple fiber nonwoven 22 g / m ² . A detailed description the PP staple fiber layer is found in the EP 1 795 247 A1 , This filter material can be obtained from the right holder.

SMS92: laminate viewed from the downstream ago following structure: spunbond 35 g / m ^2/40 g / m ² meltblown / Spinnvlies17 g / m ^2. Meltblown and spunbonded web are laminated together with this material with hotmelt. This filter material can be obtained from the right holder.

Material LT75: Laminate with the following structure: Spunbond 17 g / m ² / Staple fiber layer 75 g / m ² / Spunbond 17 g / m ² . The layers are ultrasonically laminated using the Ungricht U4026 lamination pattern. This filter material can be obtained from the right holder.

STATE OF THE ART

The demands placed on devices for vacuuming have undergone a significant change in recent years.

The study by the "AEA Energy & Environment Group" commissioned by the "European Commission Energy" to define the requirements for an eco-design for vacuum cleaners shows that it would be desirable in future from a political point of view, the recording power below 1100 W or even even less should be limited. However, vacuum cleaners users will expect the cleaning performance of vacuum cleaners, as available today with significantly higher pick-up power, to not significantly degrade.

The customer requirements for the hygiene of a device for vacuuming refer not only to the lowest possible dust emissions of the devices but also to the hygienic disposal of sucked dust.

With regard to the separation concept, vacuum cleaners without filter bags and vacuum cleaners with filter bags can be distinguished.

In vacuum cleaners with filter bags, the air flow decreases more or less with increasing loading of the filter bag with dust. Until about the year 2000, filter bags made of paper or paper with a meltblown inner layer were primarily used. Such Paper filter bags show an airflow drop of about 80% (or 60% when using multi-layer filter bags with tissue liner) when testing the reduction of the maximum air flow for partially filled dust container analogous to EN 60312. Thereafter, filter bags made of nonwoven fabrics slowly began to assert themselves. First, filter bags were used with fleece layers of low dust storage capacity (SMS filter bag). By introducing filter bags made of nonwovens with a capacity position, the decrease of the air flow could be significantly reduced (see EP 0 960 645 ). Such filter bags show when checking the reduction of the maximum air flow with partially filled dust container analogous to EN 60312 an airflow drop of about 30%.

Further improvements have been made by prefiltering loose fibers in the bag ( DE 10 2007 060 747 . DE 20 2007 010 692 and WO 2005/060807 ) or a pre-separation through a bag in the bag ( WO 2010/000453 . DE 20 2009 002 970 U1 and DE 20 2006 016 303 U1 ) reached. Flow deflections or flow distributions in the filter bag are in the EP 1 915 938 . DE 20 2008 016 300 . DE 20 2008 007 717 U1 (Dust-storing insert), DE 20 2006 019 108 U1 . DE 20 2006 016 304 U1 . EP 1 787 560 and EP 1 804 635 proposed. With such filter bags can be achieved by testing the reduction of the maximum air flow at partially filled dust container analogous to EN 60312 an air flow drop of about 15%. As a result, a further improvement in the Saugleistungskonstanz is achieved.
The European patent applications 10002964.4 . 10163463.2 , and 10163462.2 disclose improved dust holding capability by pleating the filter material or by providing the filter bag with so-called surface wrinkles. The European patent application 10009351.7 shows how an optimized positioning of the bag in the vacuum cleaner improves the suction capacity. For example, such filter bags show an airflow drop of only about 5% when testing the reduction of the maximum air flow with partially filled dust container in analogy to EN 60312.

In the DE 10 2005 054 903 B3 a dust filter bag with at least one inflow layer is disclosed, wherein the NaCl separation efficiency of the at least one inflow is in total <50%. With regard to the hygienic disposal of the sucked up dust holding plates have been developed, with which the filter bag is sealed manually, semi-automatically or automatically before removal from the vacuum cleaner (eg. EP 2 012 640 ).
In vacuuming devices operated with a filter bag, conventionally, the motor / blower unit (in the downstream direction) is located behind the filter bag, ie the suction air is sucked by the motor / blower unit through the filter bag (so-called Clean Air Principle). However, it is also possible to provide the motor / blower unit between the floor nozzle and the filter bag (so-called dirty air principle). In this case, the still loaded with dirt suction air from the motor / blower unit is blown into the filter bag.

Bagless vacuum cleaners - in particular cyclone vacuum cleaners - are distinguished by the fact that the air flow remains substantially constant when the dust collecting container is loaded with dust. The constant air flow of a cyclone vacuum cleaner is at first glance an advantage compared to vacuum cleaners with filter bags, which clog more or less with increasing loading of the filter bag, whereby the air flow is reduced accordingly. However, this is due to a poor efficiency, which in consequence leads to cyclone vacuum cleaners having to have a high electrical input power in order to generate a sufficient air flow. This high energy input is required because of the high losses that the separation principle entails, namely the loss of maintaining the high velocity of rotation of the dust-laden air in the cyclone separator.

The energy consumption required low recording power together with an air flow, which still leads to an acceptable cleaning effect, can hardly be realized with devices without filter bag.

Furthermore, in such bagless vacuum cleaners, the hygienic disposal of the absorbed dust is problematic.

In view of these drawbacks of the bagless vacuum cleaner devices, only devices for vacuuming with a vacuum cleaner and a filter bag are considered here.

With such conventional devices for vacuuming with filter bags can nowadays at moderate input power at newly inserted and unfilled filter bags realize an air flow of about 40 l / s Such vacuum cleaners have a power of about 1300 to 1400 W. If you want to achieve a higher air flow, then higher recording power required. Decreasing the power consumption, then goes along with a significant reduction in air flow and thus the cleaning effect.

In Table I, the quality factors Q ^W _un and Q ^{W are} _part of today available on the market for vacuuming devices with vacuum cleaner and the intended for these vacuum cleaner devices provided by the manufacturer filter bag. These devices are vacuum cleaners with the usual today arrangement, so with the motor / fan unit upstream filter bag. In the selection of comparative examples, in particular models were selected, which are promoted by the manufacturers as particularly ecological and / or high performance. <b> Table I: </ b> State of the art q _un [l / s] q _part [l / s] P ^el _un [W] P ^el _part [W] h ^suction _un [kPa] h ^suction _part [kPa] ψ [%] h ^fbar _un [kPa] h ^FBAR _part [kPa] Q ^W _un Q ^W _part Miele S6240 40 36 1370 1299 1.70 1.16 87.0 7.2 11.4 20.5 8.9 Miele S5 ecoline 40 35 1350 1315 1.71 1.30 87.0 6.9 9.7 21.6 11.7 Siemens Z6.0 extreme green power 37 30 904 851 1.51 0.96 62.0 4.2 8.0 22.3 7.4 Siemens Z6.0 extreme power 47 40 2091 2013 2.4 1.67 62.0 6.8 11.7 21.9 8.8 AEG Eco Ultra One S-bag classic long performance 33 27 1043 998 1.20 0.78 32.0 5.8 10.4 6.6 2.4 AEG Eco Ultra One S-bag ultra long performance 33 29 1040 1013 1.21 0.88 41.0 5.9 9.1 8.4 4.0 Numatic Henry 1C 31 28 1133 1100 1.04 0.82 84.0 8.4 9.4 10.4 7.4

As can be seen from Table I, Q ^W _un ranges from less than 7 to about 22, and Q ^W _part correspondingly lower, ranging from less than 2 to about 12. It is further noted that although some devices for vacuuming have a comparatively high quality factor for have unfilled filter bags, but show a comparatively low quality factor for partially filled filter bags.

It is also noticeable that some devices for vacuuming produce a relatively high air flow, but this is due to the poor separation efficiency of the material of the filter bag. Such vacuum cleaner give a relatively large number of dust particles back to the environment.

In addition, although there are devices for vacuuming, which show a relatively low electrical power consumption of the motor / blower unit; However, this is at the expense of the air flow, so that the cleaning effect of such vacuum cleaner is low.

DESCRIPTION OF THE INVENTION

In view of the aforementioned disadvantages of the prior art, the invention provides according to claim 1 devices for vacuuming with a vacuum cleaner and filter bags whose ecological efficiency is greatly improved in such a way that Q ^W _un greater than 25, preferably greater than 30, is and / or Q ^W _{part is} greater than 13, preferably greater than 15, particularly preferably greater than 17.
According to a preferred development of the invention described above, the air flow q _{un can be} greater than 30 l / s, preferably greater than 35 l / s and particularly preferably greater than 40 l / s.
In this way it can be ensured that, despite the greatly reduced power consumption of the device according to the invention, a similar cleaning effect is achieved as with the best vacuum cleaning devices available today.
In the invention and the aforementioned development, the air flow q _{part may be} greater than 26 l / s, preferably greater than 31 l / s and particularly preferably greater than 36 l / s.
As a result, the high cleaning effect is ensured not only with unfilled filter bag but also during the continuous filling of the filter bag.

Furthermore, in the apparatus according to the invention for vacuuming the measured negative pressure h ^suction _un greater than 1.0 kPa, preferably greater than 1.3 kPa and more preferably greater than 1.7 kPa, and the measured negative pressure h ^sucking _part is greater than 0.7 kPa , preferably greater than 1 kPa, and more preferably greater than 1.4 kPa.

In this way it is further ensured that, despite the reduced capacity of the device according to the invention, a similar cleaning effect can be achieved as with the best devices available today for vacuum cleaning, and the high cleaning effect is ensured not only with unfilled filter bag but also during the continuous filling of the filter bag.

According to the invention, the separation efficiency of the filter bag material ψ of the filter bag used in the device for vacuuming is greater than 60%, preferably greater than 80%, particularly preferably greater than 99%.

In this embodiment of the invention it is ensured that the device according to the invention for vacuuming emits only a few particles to the environment despite high ecological efficiency.

The device for vacuuming is designed so that the average power consumption of the device for vacuuming is less than 1200 W, preferably less than 800 W and more preferably less than 400 W.
As a result, with the device for vacuuming the ever-increasing energy savings requirements are met.
Particularly well is the invention described above with their previously described developments in the field of Haushaltsstaubsaugeinrichtungen, ie in particular with a filter bag volume of 1 l to 5 l in hand vacuum cleaners, especially with filter bag volume of 2 l to 7 l in vacuum cleaners and in particular with a filter volume of 3 l up to 15 l with Upright vacuum cleaners, can be used.
In a particularly preferred development, the filter bag of the device for vacuuming may have surface wrinkles, in particular fixed dovetail folds. In particular, in this case, the filter bag receiving space may comprise bow-shaped ribs which keep the wall of the filter bag spaced from the wall of the filter bag receiving space and are provided to engage the fold valleys of the surface folds.
According to another preferred development, the filter bag receiving space of the vacuum cleaner device may have a shape that approximately corresponds to the shape of the envelope of the filled filter bag.
This development ensures optimal utilization of the filter surface of the filter bag and optimal filling of the filter bag during vacuum cleaning. It In particular, it can be avoided that the filter bag unfolds only insufficiently in the filter bag receiving space.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1:

einen Filterbeutel mit Oberflächenfalten;

Fig. 2:

einen Filterbeutel mit Oberflächenfalten;

Fig. 3a und 3b:

eine schematische Ansicht einer Filtermaterial und einer Vliesmaterialbahn bei der Herstellung von Filtermaterial für Filterbeutel mit Oberflächenfalten in Form von fixierten Schwalbenschwanzfalten;

Fig. 4a bis 4c:

schematische Ansichten des Filterbeutelaufnahmeraums für einen Flachbeutel ohne Oberflächenfalten gemäß einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung zum Staubsaugen; i m Schnitt B-B sind der Übersichtlichkeit halber nur die Bügel abgebildet, die der Ein- und Ausblasöffnung benachbart sind;

Fig. 5a bis 5c:

schematische Ansichten des Filterbeutelaufnahmeraums für einen Filterbeutel mit Oberflächenfalten gemäß einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung zum Staubsaugen; im Schnitt B-B sind der Übersichtlichkeit halber nur die Bügel abgebildet, die der Ein- und Auslassöffnung benachbart sind;

Fig. 6:

eine schematische Ansicht des Filterbeutelaufnahmeraumes für einen Filterbeutel mit Oberflächenfalten gemäß einer bevorzugten Ausführungsform der erfinderischen Vorrichtung zum Staubsaugen, welche der Schnittansicht A-A in Fig. 5b mit eingelegtem Filterbeutel entspricht;

Fig. 7:

eine Ansicht des Filterbeutelaufnahmeraums für die bevorzugten Ausführungsformen gemäß Fig. 4 und Fig. 5, in welcher die Bemaßung für diesen Filterbeutelaufnahmeraum angegeben ist; und

Fig. 8

eine Querschnittsansicht eines Filterbeutels mit Oberflächenfalten der erfindungsgemäßen Vorrichtung zum Staubsaugen, in der die Bemaßung der Oberflächenfalten angegeben ist.

The figures serve to explain the state of the art and the invention. Show it:

Fig. 1:

a filter bag with surface folds;

Fig. 2:

a filter bag with surface folds;

3a and 3b:

a schematic view of a filter material and a nonwoven material web in the production of filter material for filter bags with surface wrinkles in the form of fixed dovetail folds;

4a to 4c:

schematic views of the filter bag receiving space for a flat bag without surface wrinkles according to a preferred embodiment of the device according to the invention for vacuuming; in section BB are shown for clarity, only the bracket, which are adjacent to the inlet and outlet opening;

5a to 5c:

schematic views of the filter bag receiving space for a filter bag with surface wrinkles according to a preferred embodiment of the device according to the invention for vacuuming; in section BB, for the sake of clarity, only the brackets are shown, which are adjacent to the inlet and outlet opening;

Fig. 6:

a schematic view of the filter bag receiving space for a filter bag with surface wrinkles according to a preferred embodiment of the inventive device for vacuuming, which the sectional view AA in Fig. 5b with inserted filter bag corresponds;

Fig. 7:

a view of the filter bag receiving space for the preferred embodiments according to Fig. 4 and Fig. 5 in which the dimension for this filter bag receiving space is indicated; and

Fig. 8

a cross-sectional view of a filter bag with surface wrinkles of the device according to the invention for vacuuming, in which the dimensioning of the surface wrinkles is specified.

EMBODIMENTS OF THE INVENTION

The vacuuming device according to the invention comprises a filter bag receiving space, which is adapted to the shape of the filter bag, in the present embodiment, to the shape of a flat bag.

There are two variants to be distinguished. The filter bag receiving space for a flat bag without surface wrinkles has on its insides small bow-shaped ribs, which should prevent the filter material conforms flat to the housing wall and can not be flowed through. The filter bag receiving space for flat bags with surface wrinkles is characterized by larger bow-shaped ribs which engage between the surface folds of the filter bag to assist in unfolding the folds. Apart from the bow-shaped ribs of the filter bag receiving space for both versions has the same dimensions.

The FIGS. 4a to 4c Figure 11 are schematic illustrations of the filter bag receiving space for a filter bag without surface folds. In Fig. 4a the filter bag receiving space is shown in plan view. In this plan view, it has a shape of a square with a side length of 300 mm. In the FIGS. 4b and 4c are sectional views along the lines AA and BB in Fig. 4a shown. As can be seen in these figures, the filter bag receiving space has a maximum height of 160 mm. In Fig. 7 are even more heights of in Fig. 4 indicated Filterbeutelaufnahmeraums indicated. A flat bag without surface wrinkles, on the other hand, takes on exactly the shape of a pillow during suction, in this sense it should also be understood that the filter bag receiving space has a shape that is approximately equal to the shape of a pillow the shape of the envelope of the filled filter bag corresponds.

In Fig. 4a to Fig. 4c the bow-shaped ribs are designated by the reference numeral 41. In this embodiment, all bow-shaped ribs 41 have a height h = 10 mm. The fact that the ribs are bow-shaped, a free circulation of the purified air is ensured in the filter bag receiving space.

Furthermore, in Fig. 4b and Fig. 4c a device in the form of a grid 42 is shown, which prevents the filter bag is sucked into the same due to the suction flow in the outlet opening.

The FIGS. 5a to 5c Figure 11 are schematic illustrations of the filter bag containment space for a surface-bag filter bag. As previously mentioned, apart from the bow-shaped ribs, the dimensions of the filter bag receiving space are the same as those for the filter bag receiving space according to FIG Fig. 4 and Fig. 7 , A flat bag with fixed surface wrinkles also assumes a cushion shape during the suction operation, so that the filter bag accommodation space has a shape which approximately corresponds to the shape of the envelope of the filled filter bag.

Further, the filter bag accommodating space has bow-shaped ribs 51 of different heights, such as in particular Fig. 5b and Fig. 5c you can see. Also in this embodiment, means in the form of a grid 52 is provided which prevents the filter bag from being sucked into it due to the suction flow in the outlet opening.

In Fig. 5a to Fig. 5c In addition, the measuring point at which the negative pressure in the filter bag receiving space is determined, designated by the reference numeral 53.

Fig. 6 corresponds to Fig. 5b , wherein a filter bag with fixed surface folds in the form of dovetails is inserted. The bow-shaped ribs are designated by the reference numerals 61, 62, 63 and 64. These ribs intervene between the surface folds of the filter bag and thus contribute to a development of the surface wrinkles. This is in Fig. 6 shown schematically. At the same time, the filter bag wall is kept at a distance from the wall of the filter bag receiving space so as to ensure a flow through the entire filter surface of the filter bag. The bow-shaped ribs 61 have a height h = 10 mm, the ribs 62 of 15 mm, the ribs 63 of 20 mm and the ribs 64 of 35 mm. The fact that the ribs are broken, a free circulation of the purified air is ensured in the filter bag receiving space.

The reference numeral 65 denotes in this Fig. 6 the wall of the filter bag receiving space. The inserted filter bag 66 has a plurality of surface folds, which are shown schematically as partially unfolded. The air to be cleaned is sucked into the filter bag through the inlet opening 67 and sucked out via the outlet of the filter bag receiving space 68. In front of the outlet opening 68 is still a grid, which prevents the filter bag can block the outlet opening.

Flat bags with or without surface folds can be used according to the invention. In Fig. 8 is a section of such a flat bag with surface wrinkles showing the sizes of the surface wrinkles shown. The flat bags with and without surface wrinkles, which were used for the experiments for Table II had the dimensions 290 x 290 mm. Furthermore, in Fig. 8 the diffuser from LT75 with the reference numeral 81 to see.

All filter bags with surface folds from Table II were equipped with diffusers. These consisted of 22 strips of 11 mm wide and 290 mm long. The material used for the diffusers was LT75.

As a motor / blower unit in the device according to the invention a Domel KA 467.3.601-4 was used. The suction port of the motor / blower unit was directly connected to the exhaust port of the filter bag receiving space. By regulating the mains voltage by means of a transformer, the air flow required for the experiment (as negative pressure in the measuring box) was set with the filter bag empty. This line voltage was maintained for the respective series of experiments in which 400 g of DMT 8 dust was sucked in 50 g portions. The resulting electrical power was measured. No exhaust filter was used.

Table II shows the results of the measurements for various devices of the invention with the filter bag containment space and the motor / blower unit previously described. Both filter bags with surface folds and flat bags without surface folds were used here. As the material for the filter bags used with / without surface wrinkles, the laminates CS50, SMS92 and LT75 produced by the patentee were used as shown in Table II.

As can be seen directly from Table II, all devices according to the invention have values for Q ^W _un in a range from 30.1 to 32.1. These values are thus well above the values known from the prior art (here the highest value was 22.3). The values for Q ^W t _eil be in the range 7.3 to 25.1. Apart from the values for the flat bags made of SMS, the least preferred material, there is a range of 16.8 to 25.1, which is also well above the range of known from the prior art devices (here was the highest value 11.7).

Table II also shows that the device according to the invention is superior to the prior art in that it has a comparatively low power consumption a high air flow can be obtained. Thus, in the Siemens Z6.0 extremely green power, the electrical input power of 904 W is converted into an air flow of 37.2 l / s, whereas according to the invention, to achieve an air flow of 37.9 l / s, only an electrical input power of 492 W is required ,

In addition, it is apparent from Table II that devices with filter bags with surface wrinkles are more ecologically efficient than filter bags without surface wrinkles, although very high quality factors can also be achieved with the latter. This ecological efficiency is the higher the more dust has been absorbed, as can be seen from the quality factors for the partially filled filter bags.

Filter bags made from the SMS material can also be used according to the invention, in particular at high air flows. However, it is immediately apparent from Table II that the CS50 filter material is far superior to the SMS92 material in terms of environmental efficiency. <b> Table II: </ b> Device according to the invention for vacuuming q _un [l / s] q _part [l / s] P ^el _un un [W] P ^el part [W] h ^suction _un [kPa] h ^suction _part [kPa] ψ [%] h ^fbar _un [kPa] h ^FBAR _part [kPa] Q ^W _un W Q ^W _part 53 48 1251 1231 3.05 2.50 85.0 8.1 9.7 32.0 21.9 52 47 1165 1148 2.90 2.42 85.0 7.7 8.2 32.0 25.1 50 46 1085 1068 2.75 2.33 85.0 7.4 8.6 31.6 23.0 49 44 994 974 2.60 2.13 85.0 6.9 8.3 32.0 21.8 48 43 900 891 2.45 2.00 85.0 6.5 7.8 32.0 21.8 46 42 827 813 2.30 1.89 85.0 6.1 7.3 32.0 22.0 Filter bag with CS50 surface pleats and LT75 diffuser 45 40 760 739 2.15 1.75 85.0 5,7 6.9 32.1 21.6 43 39 690 674th 2.00 1.64 85.0 5.4 6.5 31.5 21.4 41 37 620 599 1.85 1.45 85.0 4.9 6.1 32.1 20.2 40 36 551 540 1.70 1.39 85.0 4.6 5.6 31.4 21.1 38 34 492 473 1.55 1.22 85.0 4.2 5.2 31.4 19.9 36 32 429 414 1.40 1.08 85.0 3.8 4.7 31.3 19.5 34 29 364 354 1.25 0.91 85.0 3.4 4.3 31.3 18.0 32 28 309 302 1.10 0.82 85.0 3.0 3.8 31.2 18.3 30 26 261 252 0.95 0.71 85.0 2.6 3.4 31.1 17.8 26 23 201 193 0.75 0.57 85.0 2.0 2.6 31.9 18.6 Flat bag made of SMS92 26 17 212 201 0.75 0.31 85.0 2.1 3.6 30.4 7.3 40 32 580 548 1.7 0.83 85.0 4.8 7.6 30.1 9.3 53 38 1314 1235 3.05 1.6 85.0 8.4 12.9 30.9 10.5 Flat bag made of CS50 53 45 1328 1286 3.05 2.18 85.0 8.4 11.0 30.9 16.8

Claims (11)

1. Vacuum cleaning apparatus, comprising a vacuum cleaner having a mean power input of the smaller than 1200 W and a filter bag having a filtration efficiency of the filter bag material ψ of more than 60 %, wherein the vacuum cleaning apparatus has a quality factor with an empty filter bag Q^W _un defined by $${\mathrm{Q}}^{\mathrm{W}}{}_{\mathrm{un}}=\left({\mathrm{h}}^{\mathrm{saug}}{}_{\mathrm{un}}/{\mathrm{h}}^{\mathrm{fbar}}{}_{\mathrm{un}}\right)\times \mathrm{\psi }$$

   

   where

   h^saug _un: vacuum according to EN 60312 of the vacuum cleaning apparatus with an empty filter bag in [kPa],

   h^fbar _un: vacuum in the filter bag-holding compartment with an empty filter bag in [kPa], and

   ψ: filtration efficiency of the filter bag material in [%]

   which is greater than 25, preferably greater than 30, and/or the vacuum cleaning apparatus has a quality factor with a partly filled filterbag Q^w _teil defined by $${\mathrm{Q}}^{\mathrm{W}}{}_{\mathrm{teil}}=\left({\mathrm{h}}^{\mathrm{saug}}{}_{\mathrm{teil}}/{\mathrm{h}}^{\mathrm{fbar}}{}_{\mathrm{teil}}\right)\times \mathrm{\psi }$$

   

   where

   h^saug _teil: vacuum according to EN 60312 of the vacuum cleaning apparatus with a partly filled filter bag in [kPa],

   h^gbar _teil: vacuum in the filter bag-holding compartment with a partly filled filter bag in [kPa], and

   ψ: filtration efficiency of the filter bag material in [%]

   which is greater than 13, preferably greater than 15 and especialy preferably more than 17, and wherein
   the negative pressure h^saug _un is greater than 1,0 kPa and the negative pressure h^saug _teil is greater than 0,7 kPa.
2. Vacuum cleaning apparatus according to claim 1, in which the air flow with an empty filter bag is greater than 30 l/s, preferably greater than 35 l/s, and especially preferably greater than 40 l/s.
3. Vacuum cleaning apparatus according to one of patent claims 1 or 2, in which the air flow with a partly filled filter bag is greater than 26 l/s, preferably greater than 31 l/s, and especially preferably greater than 36 l/s.
4. Vacuum cleaning apparatus according to one of the preceding patent claims, in which the vacuum h^saug _un is greater than 1.3 kPa, and especially preferably greater than 1.7 kPa.
5. Vacuum cleaning apparatus according to one of the preceding patent claims, in which the vacuum h^saug _teil is greater than 1 kPa and especially preferably greater than 1.4 kPa.
6. Vacuum cleaning apparatus according to one of the preceding patent claims, in which the filtration efficiency of the filter bag material ψ is greater than 80 %, especially preferably greater than 99 %.
7. Vacuum cleaning apparatus according to one of the preceding patent claims, wherein the mean power input of the vacuum cleaning apparatus is smaller than 800 , and especially preferably smaller than 400 W.
8. Vacuum cleaning apparatus according to one of the preceding patent claims, characterized in that the vacuum cleaning apparatus is a household vacuum cleaner, in particular with a filter bag volume of 1 l to 5 l in hand-held vacuum cleaners, in particular with filter bag volumes of 2 l to 7 l in floor-type vacuum cleaners, and in particular with a filter volume of 3 l to 15 l in upright vacuum cleaners.
9. Vacuum cleaning apparatus according to one of the preceding patent claims, in which the filter bag comprises surface pleats, in particular fixed dovetailed pleats.
10. Vacuum cleaning apparatus according to patent claim 9, in which the filter bag-holding compartment comprises bow-like ribs which keep the wall of the filter bag spaced apart from the wall of the filter bag-holding compartment and are provided such that they engage in the pleat valleys of the surface pleats.
11. Vacuum cleaning apparatus according to one of the preceding patent claims, in which the filter bag-holding compartment has a shape approximately corresponding to the shape of the envelope of the filled filter bag.

Images