EP2364631B1 - Vacuum cleaner with an attached filter bag and filter bag - Google Patents

Abstract

The vacuum cleaner contains a filter bag (4) having a holding plate (9) with an inflow aperture (10) with a connector (13) bounding a first pressure regions (P1). There is a first seal (17) between the holding plate and this connector. The holding plate is also sealed by a second seal (18) from a second pressure region (P2) formed by a partition wall (15) fixed to the housing.

Description

The invention relates to a filter bag for a vacuum cleaner with a holding plate and an opening provided in the holding plate inflow, further with a fixed to the retaining plate seal for cooperation with a vacuum cleaner side nozzle.

Filter bag of the type in question have become known in various ways.

At one of the US 4,364,757 A known filter bag is a filter bag with a plastic collar known. The plastic collar is connected directly to the filter material by sewing.

In addition, the state of the art is still on the EP 1692990 A2 . US 3,392,906 and the JP 52-96967 A to refer.

Based on the first-mentioned prior art, the invention has the object to provide a favorable design of a dust filter bag in terms of a sealability to a vacuum cleaner side nozzle.

This object is achieved in the subject matter of claim 1, wherein it is based on that the holding plate is designed as a plastic injection molded part, that two seals are provided on the holding plate, that the seals are molded onto the holding plate, that both seals are integrally formed with each other and that the seals are made of TPE. According to the invention, first of all simple manufacturability is ensured. Characterized in that the holding plate itself is a plastic injection molded part, the seals can be formed, for example, in the two-component injection molding process favorably by injection molding. The fact that the seals are further integrally formed with each other, from a TPE, a high reliability, even through the Anspritzverbindung with the holding plate, is given.

The filter bag to be arranged in the vacuum cleaner serves to filter the dust-laden suction air stream. For arranging and holding the filter bag in a filter bag chamber, the filter bag has the holding plate leaving an inflow opening. In the operating state, the inflow opening is fluidly assigned to a nozzle of the vacuum cleaner, which nozzle represents the air flow connection between a device attachment having a suction mouth and the filter bag. To seal the said seal is used.

The seals may be formed widening radially outward or radially inwardly with respect to the retaining plate opening. As a result of this embodiment, an improved sealing seat is achieved. The seal blocks in the usual way a pressure range, namely the pressure range within the nozzle or within the filter bag, from a second pressure range, further in particular from the clean gas side pressure range. The pressures in these pressure ranges are always different. The intended seal on the retaining plate is designed so as to widen radially outward or radially inward in the cross section so that the pressure region of higher pressure always urges the seal into the sealing contact position. It is achieved according to an increased sealing effect.

In a preferred embodiment, the two seals on the retainer plate are coaxially aligned with respect to the retainer plate side opening. It is further provided in this regard that one of these seals expands radially outward with respect to the retaining plate opening and the other seal radially inward accordingly.

The seals may be formed in cross-section in the form of conventional lip seals. The seals here consist of a material such as TPE and are fixedly arranged on the support plate, namely molded.

In a further development, it is provided that a seal, more preferably the outer seal, is arranged such that it runs outside the nozzle to be assigned to the vacuum cleaner. The inner seal serves to cooperate with this nozzle, while the outer seal, for example, serves to cooperate with a vacuum cleaner housing section.

With the second seal, it is possible to seal in the operating state to a given by a housing-fixed partition wall of the vacuum cleaner second pressure range. The partition wall is formed, for example, from a section of the filter bag receiving filter bag chamber, in particular in an arrangement of an air flow fan motor in the flow direction behind the filter bag against the pressure area in the nozzle and beyond also to the ambient pressure or the pressure range behind the blower motor is sealed. The arrangement of a second sealing element between the holding plate and this partition additional security is created. Leaks at one or the other seal do not lead directly to a short circuit of the pressure ranges. The partition is in a further preferred embodiment in this context, an interface between the holding plate inlet and nozzle comprehensive, bottom-like wall, so that both seals can, for example, be arranged concentrically to each other, this further, if necessary, by clamping a common separation / sealing plane.

In a preferred embodiment, it is provided that both seals are exposed on one side to the pressure of a third pressure range. This pressure range differs in terms of pressure from the pressure of the other two pressure ranges. Thus, in a preferred embodiment, the ambient pressure is present in this third pressure range; Alternatively, the pressure behind the suction fan. Accordingly, a seal, more preferably an inner seal viewed from the inflow port seals the first pressure range to the third pressure range and the second, outer seal seals the second pressure range to the third pressure range. Correspondingly, a possible leakage within one of the seals does not lead to an immediate short circuit between the first and the second pressure region, so that so-called raw gas, ie dust-laden suction air, can flow from the first pressure region delimited by the nozzle to the clean gas side after the filter bag. This advantageous effect is further increased in a preferred embodiment in that the pressure in the third pressure range is higher than the respective pressure in the first pressure range and in the second pressure range. So is always the pressure in the first pressure range, ie within the nozzle and in continuation of the same always within the filter bag always lower than the pressure in the second pressure range in the flow direction behind the filter bag, further in the adjusting between Filterbeutelwandung and filter chamber space. This pressure in the second pressure range, in turn, with a corresponding arrangement of the suction fan in terms of flow behind the filter bag and the filter chamber is always lower than the ambient pressure, further always lower than the pressure behind the suction fan, which pressure of the third pressure chamber equivalent. Due to the fact that both seals according to this embodiment are exposed to the pressure of the third pressure range, eg. The ambient pressure on damage, one of the seals, in particular the inner, the raw gas side sealing seal, always the relatively clean ambient air from the sucked third pressure range, so on in the raw gas area or in the clean gas area of the second pressure range in case of damage to the other seal. According to the pressure conditions, no raw gas, ie suction laden with suction material, reaches the clean gas side. Between the seals, a connection opening to the third pressure area is provided to achieve this effect, the opening area is selected to be larger than an opening area of a possible leakage. Thus, the connection opening to be provided is preferably selected to be greater than 2 mm ² . In a concentric arrangement of the two seals and further the inflow opening and the nozzle or the nozzle connection plane is formed in a preferred embodiment, the connection opening to the third pressure region as a concentric opening, further in connection with this passing through the nozzle as a concentric annular opening. By Anformung by injection molding a firm connection between the seals and the retaining plate is achieved.

In a further preferred embodiment, the first seal, further in particular the inner, the first pressure region bounded by the neck of the third pressure region sealing with respect to the neck is formed widening radially outward. This leads in connection with the outside pending higher pressure to an improved sealing system. Thus, the first seal in cross section from the inside, ie viewed from the neck, be concave. Anyway, this extension of the first seal is provided adjacent to the sealing area, must not extend correspondingly in cross section over the entire seal length.

Also, in a development of the subject invention, the second seal with respect to the neck is formed widening radially inwardly, this described with the same effect as with respect to the first seal. Accordingly, a higher pressure also applies here on the inner side of the second seal than on the outer side (second pressure region), which correspondingly increases the sealing system. Seen from the inside, i. viewed from the nozzle, the second seal may be provided in convexly curved cross-section. The extension of the second seal is in any case provided adjacent to the sealing area, but can also be formed over the entire extension length of the seal. The one-piece design of the seals is both production as well as easy mounting. The double seal thus created may be fixedly connected to the holding plate, i. be sprayed. The two sealing sections of this double seal can in this case be rooted in a common base region, for example in a base region connected to the retaining plate. From this then extend the sealing portions respectively in the direction of the sealing region of the partition or the nozzle, leaving the connection opening in the region of the partition. If the seals are connected to one another via, for example, transverse webs, corresponding connecting openings are provided in order to connect the facing sealing surfaces to the third pressure region.

A further increase in the tightness can be achieved in that a circumferential sealing rib is formed on the holding plate and / or on the partition wall fixed to the housing against which a seal bears in the direction of pressure drop. This is preferably a rigid sealing rib, the further example. Is formed out of the holding plate or partition wall material. It can be associated with only one seal such a sealing rib. Alternatively, two sealing ribs may be provided, for cooperation with the respective associated seal, so for example. A sealing rib on the retaining plate and a sealing rib on the opposite partition.

Fig. 1

einen Staubsauger der in Rede stehenden Art in Form eines stielgeführten Handstaubsaugers, aufnehmend einen Filterbeutel;

Fig. 2

in schematischer Darstellung die Anordnung des Filterbeutels in einer Filterkammer bei Zuordnung zu einem staubsaugerseitigen Stutzen, eine erste Ausführungsform der Dichtanordnung betreffend;

Fig. 3

eine Querschnittdarstellung durch den Anschlussbereich von filterbeutelseitiger Halteplatte und Stutzen, eine zweite Ausführungsform betreffend;

Fig. 4

eine schematische Darstellung der Anordnung gemäß Fig. 3, eine dritte Ausführungsform der Dichtanordnung betreffend (keine Ausführungsform gemäß der Erfindung);

Fig. 5 - Fig. 10

weitere der Fig. 4 entsprechende schematische Querschnittdarstellungen mit Dichtungsanordnungen in verschiedenen Ausführungsformen (hierunter Fig. 5 bis 7 und 9 keine Ausführungsformen gemäß der Erfindung).

Below, the invention with reference to the accompanying drawings, which illustrates only exemplary embodiments, explained in more detail. It shows:

Fig. 1

a vacuum cleaner of the type in question in the form of a stalk-guided hand vacuum cleaner, receiving a filter bag;

Fig. 2

a schematic representation of the arrangement of the filter bag in a filter chamber when assigned to a vacuum cleaner side nozzle, a first embodiment of the sealing arrangement regarding;

Fig. 3

a cross-sectional view through the connection region of filter bag side retaining plate and nozzle, a second embodiment concerning;

Fig. 4

a schematic representation of the arrangement according to Fig. 3 a third embodiment of the sealing arrangement concerning (not an embodiment according to the invention);

Fig. 5 - Fig. 10

more of the Fig. 4 corresponding schematic cross-sectional views with sealing arrangements in various embodiments (hereunder Fig. 5 to 7 and 9 no embodiments according to the invention).

Shown and described is first with reference to Fig. 1 a vacuum cleaner 1, in particular household vacuum cleaner, which is designed as a hand-held handle device. This first comprises a base unit 2, with an electric motor, not shown, for a suction / blower unit. At the base unit 2 a provided for receiving the sucked-up dust, air-impermeable filter cartridge 3 is docked. This includes a filter bag 4.

The power supply of the integrated in the base unit 2 electric motor via an electric cable. 5

Next, the base unit 2 has a gooseneck-shaped extension, which extends over the region of the filter cartridge 3. In the area of the free end, this extension forms a plug-in receptacle for a handle 6 of the vacuum cleaner 1. In the region of the free end of the stem 6, an actuating handle 7 is provided. This has a thumb-actuatable setting unit in the form of a slide switch, via which the power of the recorded in the base unit 2 electric motor is adjustable.

For tillage the base unit 2 is fluidly connected to a header 8. This can be a, a rotating brush having suction nozzle.

The suction mouth, not shown, of the attachment 8 is in fluid communication with the filter bag 4 accommodated in the filter cassette 3, for which a flow channel 12 passes through the base unit 2. End side of this flow channel 12 is in a socket 13 via.

This connection piece 13 is placed in a cassette receptacle formed in a parting plane T between the filter cassette 3 and the base unit 2. This cassette receptacle forms a bottom 14 penetrated by the connecting piece 13 to form a dividing wall 15 between the base unit 2 or the area surrounding the connecting piece 13 and the connected filter cassette 3 or the annular space 16 which is established between the filter cassette 3 and the filter bag 4 used.

Plane offset from the partition 15 extends in the illustrated embodiment made of a plastic material retaining plate 9 of the filter bag 4, which has associated with the nozzle 13 of the flow channel 12 an inflow opening 10 for introducing the dust-laden suction air. On the holding plate 9 is lower side, i. facing away from the base unit-side partition wall 15, an air-permeable dust bag 11 is attached. In the operating position of the filter bag 4 is in overhead position in the filter cartridge 3 a; Accordingly, in the suction operation is flowed through from below through the inlet opening 10.

The arrangement is further selected so that the dust-laden suction air is sucked through the nozzle 13 passing through the filter bag 4 and passes from here via the annular space 16 between the filter cartridge 3 and filter bag 4 to the downstream fan motor. Accordingly, in the nozzle 13 and further in the bag inside a first pressure range P ₁ , which is smaller than the pressure in the second pressure range P ₂ , which second pressure range P ₂ through the annulus 16 between the filter bag 4 and filter cartridge 3 and further through the partition 15 of the base unit 2 is limited.

Furthermore, the pressure in the second pressure range P ₂ is less than the ambient pressure (third pressure range P ₃ ), which pressure adjusts itself to the nozzle 13, for example, also within the base unit 2.

The pressure in the pressure range P ₃ can also be the pressure immediately behind the suction fan.

The transition from spigot 13 to the inflow opening 10 is sealed off by two seals 17 and 18 which are coaxially aligned coaxially with respect to an inflow opening axis x. Thus, a radially inner seal 17 for sealing between the holding plate 9 and nozzle 13 and a radially outer seal 18 for sealing between the holding plate 9 and the partition wall 15 is provided.

A passage opening 19 in the partition 15 for throughput of the nozzle 13 is formed enlarged relative to the nozzle diameter, so that circumferentially of the nozzle 13, an annular gap 20 is established. This annular gap represents a connection opening 21, for connecting the pressure chamber P ₃ to the annular space 22 left between them by the coaxially arranged seals 17 and 18. Accordingly, the pressure of the pressure region P _{3 is in} each case on one side of the seals 17 and 18, then continue on the facing each other sealing surfaces. According to the above-described pressure conditions is at these facing surfaces of the seals 17 and 18 always higher pressure than on the side facing away from the annulus 22. Thus, in the event of damage to one of the seals 17 and / or 18, the relatively clean ambient air from the pressure region P ₃ , depending on which seal is damaged, is either drawn into the dust-laden pressure region P ₁ or into the clean gas region (pressure region P ₂ ). Thus it is avoided that contaminated air from the pressure range P ₁ enters the dust-cleaned pressure range P ₂ or even into the clean air range of the pressure range P ₃ .

The representations in the FIGS. 2 to 10 show various embodiments of the seals 17 and 18. Thus, according to the schematic representation in Fig. 2 two individual seals 17 and 18 are provided, each viewed from the nozzle 13 from the outer seal in cross section convex and the inner seal 17 are concave in cross section. Correspondingly, the seals 17 and 18 project towards each other in a curved manner, which leads to an improved sealing seat due to the higher pressure applied internally to the pressure region P ₃ .

As an alternative in Fig. 3 shown, the seals 17 and 18 may also be made in one piece, so on, for example, in cross-section forming a U-shape, with a U-opening, which faces the retaining plate 9. In the embodiment of the holding plate 9 as a plastic injection molded part, the double seal 31 thus created can be molded onto the holding plate 9. The seals 17 and 18 are formed by the U-legs, while the seals connecting the seals 17 and 18 U-web faces the annular gap 20 and the connection opening 21. Under sealing support of resting on the partition wall 15 portions of the seals 17 and 18 31 openings 23 are left in the U-web of the double seal, for connecting the created between the seals 17 and 18 annular space 22 with the pressure range P _3rd

The Fig. 4 to 7 and 9 , which are described below, do not relate to embodiments of the invention.

Fig. 4 shows an alternative embodiment, in which the inner seal 17 is molded as a circumferential lip seal the end face of the pipe 13. The free end portion of the seal 17 is sealingly on the facing, the inflow opening 10 surrounding the holding plate surface.

The outer seal 18 is supported on the partition wall 15, so further plugged. This is a separate injection-sealing part, which, starting from a connection portion 24, carries a leg 25 extending in the direction of the associated holding plate surface. The latter is provided with an integrally formed sealing ring 26, for sealing support on the associated holding plate surface.

By the selected plug assignment of the outer seal 18 to the partition wall 15, this is interchangeable in the event of a defect.

There are in this embodiment, three sealing levels created, namely a sealing plane between the outer seal 18 and sealing ring 26 and the holding plate 9, a sealing plane between the outer seal 18 and connecting portion 24 and partition 15, and a sealing plane between inner seal 17 and retaining plate. 9 ,

A similar embodiment is in Fig. 5 shown. Again, the inner seal 17 is molded as a lip seal on the nozzle 13. The outer seal 18 is present as a plug-in part, with an opening portion of the passage opening 19 comprehensive connection portion 24, which, facing the holding plate 9, merges into a radially outwardly widening in cross-section sealing portion 27. This is designed to be rectilinear in cross section. Its free end lies circumferentially on the facing holding plate surface. There are three levels of sealing, namely one between the seal 18 and the holding plate 9, a sealing plane between the seal 18 and the partition wall 15, and a sealing plane between the molded seal 17 and the holding plate. 9

Fig. 6 shows an embodiment in which the outer seal 18 is molded like a lip on the holding plate 9, this further with respect to the nozzle 13 radially inwardly widening, for sealing contact with the facing surface of the partition 15th

The inner seal 17 is formed in this embodiment as a plug-in part. In this case, a circumferential collar 28 comprises the facing end portion of the nozzle 13 outside the wall. The plug assembly is secured by a mantelaußenwandseitig provided on the neck 13 annular bead 29, which enters into a corresponding annular recess 30 of the collar 28. Starting from this collar 28, the gasket 18 extends concavely curved in cross-section from the neck 13, passing through the opening 19 of the partition wall 15, the free end region of the gasket 18 being viewed from the neck 13 extending radially outward to bear against the neck facing holding plate surface. The passage through the partition wall opening 19 takes place while leaving the annular gap 20 provided radially outside the seal 17.

By forming the inner seal 17 as a plug-in part, this can be replaced in the event of a defect. The immediate arrangement of the outer seal 18 on the retaining plate 9 offers the advantage of a regular renewal of this seal 18 with each filter bag change.

In this embodiment, three sealing levels result. Thus, a sealing plane between the outer seal 18 and the partition wall 15 and a

Density level between the inner seal 17 and the holding plate 9 a. The third sealing plane results between inner seal 17 or collar 28 and connecting piece 13.

Also, as further in the FIGS. 7 and 8th shown, a two seals 17 and 18 forming double seal 31 may be provided. So first is related to Fig. 7 a plug-connectable double seal 31 is formed, for plug assignment to the nozzle 13, in which case a holder is selected according to the embodiment in Fig. 6 ,

Here too, starting from the collar 28, the section forming the inner seal 17 initially extends under concave curvature, passing through the partition wall opening 19 until it contacts the facing holding plate surface. The coaxial with the inner seal 17 arranged outer seal 18 is connected in the region between the partition wall 15 and retaining plate 9 via a transverse connection 32 with the inner seal 17. This cross-connection 32 is formed web-like in cross section. Further, the transverse connection 32 is circumferentially provided with openings 33, the pressure-moderately connected between the seals 17 and 18 left annular space 22 with the pressure chamber P _3rd

As well as the seals 17 and 18 in the embodiment according to Fig. 6 are in this embodiment, the seals 17 and 18 in cross-section facing each other arched, which improves the sealing seat of the respective seal against the respective contact surface by the inner higher pressure.

In the case of a possible defect of one or both seals 17 and / or 18, exchanging both seals 17 and 18 is possible by means of the plug arrangement of the double seal 31 on the connecting piece 13.

This results in this embodiment, a total of four sealing levels, namely between inner seal 17 and collar 28 and nozzle 13, between inner seal 17 and retaining plate 9, further between outer seal 18 and retaining plate 9 and finally between the outer seal 18 and partition 15th

When in the Fig. 8 In the embodiment shown, the two seals 17 and 18 are connected to one another in a common root region 34, via which root region 34 the double seal 31 designed in this way is attached to the holding plate 9 by injection molding. Starting from the root region 34, the outer seal 18 extends in cross section from the neck 13 viewed convex toward the associated contact surface of the partition 15. The inner seal 17 extends from the root portion 34 starting concave in the direction of the end edge of the nozzle 13, to Plug connection with this.

Due to the direct attachment of both seals 17 and 18 to the support plate 9 is carried out in an advantageous manner replacement of the seals at each filter bag change.

In this embodiment, two sealing levels are achieved, one between the outer seal 18 and the partition wall 15 and one between the inner seal 17 and the stub 13.

As further from the representation in Fig. 9 to recognize, there is also the possibility to inject both seals 17 and 18, in particular the inner seal 17 at the front end of the nozzle 13 and the outer seal 18 on the partition wall 15 facing surface of the holding plate 9. Auch This results in the advantage of a constant replacement of the outer seal 18 with each filter bag change. This results in two sealing levels, one between the outer seal 18 and the partition wall 15 and one between the inner seal 17 and the holding plate. 9

Finally, as in Fig. 10 shown, on the holding plate 9, associated with the edge of the inflow opening 10, an axially projecting in the direction of the nozzle 13 sealing rib 35 may be provided. This is formed in one piece from the holding plate 9 in the illustrated embodiment. This sealing rib 35 supports radially inwardly from the molded in this embodiment, the end edge of the nozzle 13 inner seal 17. Accordingly, this seal 17 is supported in Druckgefällerichtung, which further increases the sealing seat.

Such a sealing rib may be further provided, for example, including the outer seal 18 in the associated region of the partition wall 15 in order to achieve a support of the outer seal 18 in Druckgefällerichtung here.

The proposed solutions ensure that no raw gas (polluted air) gets into the clean gas (cleaned air) even if a seal is damaged. The arrangement of two substantially coaxially arranged seals 17 and 18 and thereby adjusting annular space 22, a pressure lock is provided which prevents air or dirt from one to the other side of the seal passes, as they would have to move against the pressure gradient ,

reference numeral

1

vacuum cleaner

2

basic unit

3

filter cassette

4

filter bag

5

electric cable

6

stalk

7

operating handle

8th

header

9

Retaining plate

10

inflow

11

anther

12

flow channel

13

Support

14

ground

15

partition wall

16

annulus

17

poetry

18

poetry

19

Through opening

20

annular gap

21

connecting opening

22

annulus

23

openings

24

connecting section

25

leg

26

seal

27

sealing portion

28

collar

29

torus

30

annular recess

31

double seal

32

cross-linking

33

openings

34

root area

35

sealing rib

T

parting plane

P ₁

First print area

P ₂

Second pressure range

P ₃

Third pressure range

x

axis

Claims (11)

1. Filter bag (4) for a vacuum cleaner (1) comprising a retaining plate (9) and comprising an inflow opening (10) provided in the retaining plate (9), further comprising a seal (17, 18) attached to the retaining plate (9) for cooperating with a connecting piece (13) on the vacuum cleaner side, characterised in that the retaining plate (9) is formed as a plastics material injection-moulded part, in that two seals (17, 18) are provided on the retaining plate (9), in that the seals (17, 18) are injection-moulded on the retaining plate (9), in that the two seals (17, 18) are formed together in one piece, and in that the seals consist of TPE.
2. Filter bag according to claim 1, characterised in that a seal (17, 18) is formed such that it widens radially outwardly or radially inwardly with respect to the inflow opening (10).
3. Filter bag according to either claim 1 or claim 2, characterised in that a seal (18) is arranged such that it extends on the outside of the associated connecting piece (13) on the vacuum cleaner side.
4. Filter bag according to any of the preceding claims, characterised in that the seals (17, 18) are formed such that they are curved with respect to each other.
5. Filter bag according to any of the preceding claims, characterised in that a circumferential sealing rib is formed on the retaining plate (9), against which a seal (17, 18) can rest in the direction of the pressure gradient.
6. Filter bag according to any of the preceding claims, characterised in that the seals (17, 18) are interconnected via transverse webs.
7. Filter bag according to any of claims 1 to 6, characterised in that the seals (17, 18) are attached to a common base region, which is connected to the retaining plate (9).
8. Filter bag according to any of claims 1 to 7, characterised in that the seals (17, 18) form a U-shape in cross-section.
9. Filter bag according to claim 8, characterised in that the seals (17, 18) are formed by the U-legs.
10. Filter bag according to either claim 8 or claim 9, characterised in that the U-shaped opening faces the retaining plate (9).
11. Filter bag according to any of claims 8 to 10, characterised in that, with regard to a sealing support of the portions of the seals (17, 18) that come into contact with a dividing wall of the vacuum cleaner, openings (23) are left in the U-shaped web of the double seal.

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