ES2373483T3 - POWDER VACUUM WITH A FILTER BAG PROVIDED IN SAID POWDER VACUUM AS WELL AS FILTER BAG FOR IT. - 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

Dust aspirator with a filter bag arranged in said dust aspirator as well as a filter bag for it.

The invention relates to a dust aspirator with a filter bag disposed in said dust aspirator, in which the filter bag has a retention plate with a current inlet hole, whose current inlet hole is associated with a fitting defining a first pressure zone, in which a sealing gasket is arranged between the retention plate and the fitting.

Dust vacuum cleaners of the type in question are known, especially in the form of household vacuum cleaners. These are used for the treatment of surface dust, in particular of floor surfaces, such as hard floors or carpeted floors, but, in addition, also used corresponding supplements for the treatment of surface dust above ground. The filter bag arranged in the dust aspirator is used to filter the suction air stream loaded with dust. For the arrangement and fixation of the filter bag in a filter bag chamber, the filter bag has a retention plate that leaves a hole for admission of the current. The orifice of admission of the current is associated, as regards the circulation, in the operating state to a fitting of the dust aspirator, whose fitting represents the connection of the air circulation between a supplement of the apparatus, which has a mouth of suction, and filter bag. For the sealing of the interface that fits between the retention plate or the inlet hole of the current and the fitting, it is also known to provide a sealing gasket.

With regard to the state of the art, for example, reference is made to EP 532 057 A2. In the known object therefrom, a sealing gasket provided in the retention plate collaborates with the inserted fitting, which is molded by surrounding injection.

Starting from the known state of the art, the invention has set forth the task of further improving a dust aspirator of the type in question as regards the sealing gasket of the inserted filter bag.

This task is solved in the object of claim 1, in which it has been proposed that the retention plate be hermetically sealed by means of a second sealing gasket with respect to a second pressure zone determined by a fixed separation wall in the housing The separation wall is formed, for example, by a section of a filter bag chamber that receives the filter bag and which is tightly closed, especially in the case of an arrangement of a blower motor that provides air circulation in the direction of the circulation behind the filter bag with respect to the pressure zone in the fitting and, in addition, it is also hermetically sealed against the ambient pressure or the pressure zone behind the blower motor. Through the provision of a second sealing element between the retaining plate and this separation wall an additional lock is created. Leaks in one or the other of the sealing joints do not lead directly to a short circuit of the pressure zones. The separation wall is, in another preferred configuration in this context, a wall of the bottom type, comprising the point of intersection between the intake hole of the retention plate current and the fitting, so that both gaskets of sealing can be arranged, for example, concentric with each other, this, in addition, if necessary covering a common separation plane / sealing plane.

In a preferred configuration, it is provided that the two sealing joints are exposed on one side to the pressure of a third pressure zone. This pressure zone differs, in terms of pressure, from the pressure of the other two pressure zones. Thus, in a preferred embodiment, in this third pressure zone is the ambient pressure; alternatively, also the pressure behind the suction blower. Correspondingly, a sealing gasket, more preferably an internal sealing gasket considered from the inlet port of the stream, tightly closes the first pressure zone to the third pressure zone and the second outer gasket seals tightly. the second pressure zone towards the third pressure zone. Correspondingly, a possible leak within one of the sealing joints does not lead to an immediate short circuit between the first and the second pressure zone, so that the so-called raw gas, that is to say suction air loaded with dust, can circulate from the first pressure zone delimited by the fitting towards the side of pure gas after the filter bag. This advantageous effect is still raised in a preferred configuration because the pressure in the third pressure zone is higher than the respective pressure in the first pressure zone and in the second pressure zone. In this way, always the pressure in the first pressure zone, that is, inside the fitting and in the extension thereof, also inside the filter bag is always lower than the pressure in the second pressure zone in the direction of circulation. behind the filter bag, also in the space that fits between the wall of the filter bag and the filter chamber. This pressure in the second pressure zone is again, in a corresponding arrangement of the suction blower as regards the circulation behind the filter bag and the filter chamber always lower than the ambient pressure, also also always less than the pressure behind the suction blower, whose pressure corresponds to that of the third pressure space. Conditioned because the two gaskets as a result of this configuration are exposed, respectively, on one side to the pressure of the third pressure zone, for example to the ambient pressure, in the case of deterioration of one of the gaskets , in particular of the inner seal which closes the side of the raw gas, always the relatively purer ambient air is drawn from the

third pressure zone, successively to the raw gas zone and the pure gas zone, respectively, of the second pressure zone in the event of deterioration of the other sealing gasket. According to the pressure ratios, no raw gas arrives, that is, suction air loaded with sucked material, on the side of pure gas. To achieve this effect, a communication orifice with the third pressure zone is provided between the sealing joints, whose opening surface is selected greater than an opening surface of a possible leak. Thus, for example, the intended communication hole should preferably be selected greater than 2 mm2. In the case of a concentric arrangement of the two sealing seals as well as, in addition, the inlet hole of the current and the fitting or of the connection plane of the fitting, in a preferred configuration, also the orifice of communication with the third Pressure zone is configured as a concentric orifice, also in relation to the fitting that crosses it, it is formed as a concentric annular orifice.

The two sealing gaskets can be fixedly connected to the retention plate, so that it can be a component of the replaceable filter bag. Alternatively, there is also the possibility of connecting both sealing joints fixedly with the fitting or alternatively with the separation wall, this taking into account in each case the communication hole provided towards the surfaces of the two sealing joints that they converge more preferably in a cross section.

In another alternative configuration, one sealing gasket can be fixedly connected to the retention plate and the other retention gasket can be fixedly connected to the fitting. Alternatively to this arrangement, the other seal may also be fixedly connected to the separation wall. In another configuration, one sealing gasket is connected to the fitting and the other sealing gasket is connected to the separation wall. In an arrangement of a sealing gasket or also of the two sealing gaskets on the retention plate, the advantageous effect of a consequent replacement of one or both sealing gaskets results during the usual change of the filter bag.

The fixed connection of the sealing gasket with the fitting and / or of the retaining plate and / or of the separation wall is achieved in a configuration of the object of the invention by means of an insert fixing bracket. Such an insert fixing bracket is especially advantageous in connection with the fitting or with the separation wall. Through the loosening of the insertion fixing support, a sealing gasket arranged in this way can be replaced, if necessary both sealing gaskets arranged in this way, in case of damage. Furthermore, alternatively, the fixed joint of the sealing gasket with the fitting and / or with the retaining plate and / or with the separation wall can be achieved through an integral formation, in addition, for example, in the case of a configuration of the support sections (fitting, retaining plate or separation wall) of a plastic material, by injection molding of the joint or of the sealing joints. In addition, there is also the possibility of gluing or welding one or both together with the respective part.

As a seal, conventional lip seals are contemplated, but, in addition, also, for example, O-rings or sealing rings, which are constituted in each case of a rubber material or of a rubber-like material such as TPE .

In another preferred configuration, the first sealing gasket, in particular the internal sealing gasket, which separates the first pressure zone delimited by the third pressure zone fitting, is configured with respect to the fitting so that it widens radially towards outside. This leads in connection with the higher pressure that is formed outside to an improved sealing support. In this way, the first seal can be concave, seen in the cross section from the inside, that is, from the fitting. This widening of the first sealing gasket is provided in any case adjacent to the sealing zone; correspondingly it does not necessarily have to extend in the cross section over the entire length of the seal.

In a development of the object of the invention, the second sealing gasket is configured so that it widens radially in relation to the fitting; This is described with the same effect as in relation to the first seal. Correspondingly, also here on the inner side of the second sealing gasket there is a higher pressure than on the outer side (second pressure zone), which correspondingly raises the sealing support. Considered from the inside, that is, from the fitting, the second seal can be provided convexly arched in the cross section. The widening of the second sealing gasket is provided in any case adjacent to the sealing zone, but it can also be formed over the entire length of the sealing gasket.

It has been revealed that this favorable in terms of manufacturing and assembly a configuration, in which both gaskets are configured in one piece with each other. The double sealing gasket created in this way can be fixedly connected to the retaining plate or to the fitting or to the separation wall, for example connected by insertion or it can be injection molded. The two sealing sections of this double sealing gasket can in this case be rooted in a common socket area, such as for example in a socket area that is connected to the retaining plate. The sealing sections are then extended from this socket area, respectively, in the direction of the sealing area of the separation wall or

of the fitting, leaving the communication hole in the area of the separation wall. If the sealing joints are joined together, for example by means of transverse ribs, then corresponding communication holes are provided to connect the sealing surfaces associated with the third pressure zone.

Additional sealing of the seal can be achieved because a surrounding sealing rib is formed on the retaining plate and / or on the fixed separation wall in the housing, against which a sealing joint is supported in the direction of fall of the pressure. In this case, it is preferably a flex-resistant sealing rib, which is further formed, for example, from the material of the retaining plate or the material of the separation wall. Such a sealing lip may be satiated only to a sealing joint. Alternatively, two sealing ribs can also be provided, for collaboration with the associated sealing gasket in each case, such as for example a sealing rib in the retaining plate and a sealing rib in the opposite separation wall. .

The invention is explained in detail below with the help of the accompanying drawing, which represents only embodiments. In this case:

Figure 1 shows a dust aspirator of the type in question in the form of a manual guided dust aspirator with handle, which receives a filter bag.

Figure 2 shows in schematic representation the arrangement of the filter bag in a filter chamber in association with a fitting on the side of the dust aspirator, with reference to a first embodiment of the sealing arrangement.

Figure 3 shows a representation of the cross section through the connection area of the retention plate on the side of the filter bag and the fitting, with reference to a second embodiment.

Figure 4 shows a schematic representation of the arrangement according to Figure 3, with reference to a third embodiment of the sealing arrangement.

Figures 5 to 10 show other schematic representations of the cross section corresponding to Figure 4, with sealing gasket arrangements in different embodiments.

First of all, a dust vacuum 1, in particular domestic dust vacuum cleaner, which is realized as a manual guided handle apparatus, is represented and described with reference to FIG. This handle apparatus first features a base device 2, with an electric motor not shown for a suction / blower unit. In the base device 2 an air-tight filter box 3 is connected, intended for the reception of the sucked dust material. This filter box contains a filter bag 4.

The power supply of the electric motor integrated in the base device 2 is carried out by means of an electric cable 5.

In addition, the base apparatus 2 has a projection in the form of a dovetail, which extends over the area of the filter box 3. In the area of the free end, this projection forms an insertion housing for a handle 6 of the vacuum cleaner dust 1. An activation handle 7 is provided in the area of the free end of the handle 6. It has an adjustment unit that can be activated with the thumb in the form of a cursor switch, through which the electric motor power housed in the base device 2.

For the treatment of the floor, the base apparatus 2 is connected as regards the circulation with an additional apparatus 8. This supplementary apparatus may be a suction nozzle having a rotating brush.

The suction port not shown in the supplementary device 8 is, as regards the circulation, in connection with the filter bag 4 received in the filter box 3, for which purpose a circulation channel 12 passes through the base device 2. In On the extreme side, this circulation channel 12 passes to a fitting 13.

This fitting 13 is located in a box housing that is configured in a separation plane T between the filter box 3 and the base apparatus 2. This housing housing forms a bottom 14 crossed by the fitting 13, for forming of a separation wall 15 between the base apparatus 2 or the area surrounding the fitting 13 and the connected filter box 3 or the annular space 16 that fits between the filter box 3 and the inserted filter bag 4 .

Displaced in the plane with respect to the separation wall 15, a retention plate 9 of the filter bag 4 is extended, which is manufactured in the exemplary embodiment represented of a plastic material and which it has, associated to the channel 13 of circulation 12 an intake port of the current 10 for the introduction of the suction air loaded with dust. On the underside of the retention plate 9, that is, away from the separation wall on the side of the base apparatus, an air permeable dust bag 11 is fixed. In the operating position, the filter bag 4 fits in the position above the head in the filter box 3; agree

with this, in the suction operation, the current attacks from below through the intake hole of the current

10.

In addition, the arrangement that the dust-laden suction air is sucked through the fitting 13 through the filter bag 4 and from there arrives through the annular space 16 between the filter box 3 and the filter bag 4 towards the blower motor connected below. Correspondingly, in the fitting 13 and, also, also inside the bag a first pressure zone P1 is set, which is less than the pressure in the second pressure zone P2, whose second pressure zone P1 is delimited by the annular space 16 between the filter bag 4 and the filter box 3 and, in addition, by the separation wall 15 of the base apparatus 2.

The pressure in the second pressure zone P2 is, in addition, as a consequence of the expected suction circulation, lower than the ambient pressure (third pressure zone P3), whose pressure is adjusted, among others, also outside the base apparatus 2 surrounding the fitting 13.

The pressure in the pressure zone P3 may also be the pressure immediately behind the suction blower.

The transition from the fitting 13 to the inlet port of the current 10 is tightly closed by means of two axially aligned sealing seals 17 and 18, essentially coaxial to an x-axis of the current inlet port. Thus, a radially inner seal 17 is provided for the seal between the retaining plate 9 and the fitting 13 and a radially outer seal 18 is provided for the seal between the retention plate 9 and the separation wall fifteen.

A through hole 19 in the separation wall 15 for crossing the fitting 13 is configured enlarged with respect to the diameter of the fitting, so that an annular gap 20 is fitted in the circumferential of the fitting 13. This annular gap represents a communication hole 21, for the communication of the pressure space P3 with the annular space 22 below by the sealing joints 17 and 18 arranged coaxially between them. Correspondingly, the pressure of the pressure zone P3 appears, respectively, on one side of the sealing joints 17 and 18, also on the sealing surfaces that converge with each other. As a consequence of the pressure ratios described above, a higher pressure is always formed on these associated surfaces of the sealing joints 17 and 18 than on their sides away from the annular space 22. Thus, in the case of a deterioration of one of the sealing gaskets 17 and / or 18 always sucks the relatively cleaner ambient air from the pressure zone P3, according to the sealing gasket that is damaged, or to the pressure zone P1 loaded with dust or the zone of pure gas (pressure zone P2). In this way, air affected by dirt is prevented from reaching from the pressure zone P1 to the pressure zone P2 cleaned of dust or even to the pure air zone of the pressure zone P3.

The representations in Figures 2 to 10 show different embodiments of the sealing joints 17 and 18. Thus, for example, according to the schematic representation in Figure 2, two individual sealing joints 17 and 18 are provided, of so that in each case considered from the fitting 13, the outer sealing gasket is convex arched in the cross section and the inner sealing gasket 17 is concave arched in the cross section. Correspondingly, the sealing joints 17 and 18 are curved directed over each other, which leads to an improved sealing seat, by virtue of the higher pressure existing inside the pressure zone P3.

As shown alternatively in Figure 3, the gaskets 17 and 18 can also be made in one piece, forming, for example, a U-shape in the cross-section, with a U-shaped opening, which is directed towards the retention plate 9. In the case of the configuration of the retention plate 9 as a plastic injection molded part, the double sealing gasket 31 created in this way can be injection molded in the retention plate 9. The gaskets of sealing 17 and 18 are formed by the arms of the U, while the rib of the U, which connects the sealing joints 17 and 18 is directed towards the annular gap 20 or towards the communication hole 21. Under the support of Sealing of the sections of the sealing gaskets 17 and 18, which rest on the separation wall 15, holes in the rib of the U of the double sealing gasket 31 are due, for the connection of the space annular 22, created between the seals 17 and 18, with the pressure zone P3.

Figure 4 shows an alternative configuration, in which the inner seal 17 is injection molded as a circumferential lip seal on the front side of the fitting 13. The free end zone of the seal is resting with a sealing effect on the surface of the associated retention plate and surrounding the inlet hole of the current.

The outer seal 18 is retained in the separation wall 15, also retained by insertion. In this case, it is a separate die-cast sealing part that, starting from a joint section 24, supports an arm 25 that extends in the direction of the surface of the associated retention plate.

Through the selected insertion association of the outer seal 18 in the separation wall

15, this seal can be replaced in the event of a defect.

In this embodiment, three sealing planes have been created, namely a sealing plane between the outer sealing gasket 18 or the sealing ring 26 and the retaining plate 9, a sealing plane between the sealing gasket. exterior 18 or the junction section 24 and the separation wall 15, as well as a sealing plane between the inner seal 17 and the retaining plate 9.

A similar configuration is shown in Figure 5. Also here the inner seal 17 is injection molded as a lip seal in the fitting 13. The outer seal 18 is present as an insert, with a joint section 24, which encompasses the edge of the passage hole 19 and which, directed towards the retaining plate 9, passes to a sealing section 27 that widens radially outward in the cross section. This shutter section is configured linearly in the cross section. Its free end rests circumferentially on the associated surface of the retention plate. Three sealing planes result, namely a sealing plane between the sealing gasket 18 and the retaining plate 9, a sealing plane between the sealing gasket 18 and the separation wall 15 as well as a sealing plane between the sealing gasket 17 injection molded and retaining plate 9.

Figure 6 shows an embodiment, in which the outer sealing gasket 18 is injection molded as a sealing lip in the retaining plate 9, so that it also widens radially inwardly, relative to the fitting 13, for the sealing support on the associated surface of the separation wall 15.

The inner seal 17 is configured in this embodiment as an insert. In this chaos, a circumferential collar 28 surrounds the associated end section of the fitting 13 on the outer side of the wall. The insertion arrangement is secured by an annular bead 29 provided on the side of the outer wall surrounding the fitting 13, which penetrates a corresponding annular recess 30 of the collar 38. Starting from this collar 28, the seal 18 extends in the cross-section, considered from the fitting 13, concavely curved, through the hole 19 of the separation wall 15, so that the free end zone of the sealing gasket 18, considered from the fitting 13, widens radially out for support on the surface of the associated retention plate. The passage through the hole in the separation wall 19 is carried out leaving the annular gap 20 provided, in addition, radially outside the sealing gasket 17.

Through the configuration of the inner seal 17 as an insert, it can be replaced in the event of a defect. The immediate arrangement of the outer seal 18 in the retaining plate 9 offers the advantage of a regular renewal of this seal 18 with each replacement of the filter bag.

In this embodiment, three sealing planes result. In this way, a sealing plane is adjusted between the external sealing gasket 18 and the separation wall 15 and a sealing plane between the internal sealing gasket 17 and the sealing plate. retention 9. The third sealing plane results between the inner sealing gasket 17 or the collar 28 and the fitting 13.

As shown, in addition, in Figures 7 and 8, a double sealing gasket 31 which forms the two sealing gaskets 17 and 18 can also be provided. Thus, for example, first of all with reference to Figure 7, it is configured a double sealing gasket 31 that can be connected by insertion, for the association by insertion to the fitting 13, so that a fixing support according to the embodiment in figure 6 is selected here.

Also here, starting from the collar 28, the section is first extended, which configures the inner seal 17 under concave curvature through the hole in the separation wall 19 until it rests on the surface of the associated retaining plate. The outer sealing gasket 18 coaxially arranged to the inner sealing gasket 17 is connected in the area between the separation wall 15 and the retaining plate 9 by means of a transverse joint 32 with the internal sealing gasket 17. This transverse joint 32 is formed as a rib in the cross section. In addition, the transverse joint 32 is provided in the periphery with holes 33, for connection according to the pressure of the annular space 22 left between the sealing joints 17 and 18 with the pressure space P3.

As also the sealing gaskets 17 and 18 in the embodiment according to figure 6, also in this embodiment, the sealing gaskets 17 and 18 are arched in the cross section directed towards each other, which improves the seating of sealing the respective sealing gasket against the respective bearing surface through the highest internal pressure.

In the event of a possible defect of one or both of the sealing gaskets 17 and / or 18, a replacement of the two sealing gaskets 17 is possible through the insertion arrangement of the double sealing gasket in the fitting 13 and 18.

In this embodiment, four sealing planes result, in general, between the seal

inner 17 or the collar 28 and the fitting 13, between the inner sealing gasket 17 and the retaining plate 9, also between the outer sealing gasket 18 and the retaining plate 9 and finally between the outer sealing gasket 18 and the separation wall 15.

In the embodiment shown in FIG. 8, the two sealing gaskets 17 and 18 are joined together in a common area of the root 34, through which the root seal 34 is fixed the double sealing gasket 31 configured in this way through injection molding on the retaining plate 9. Starting from the root zone 34, the outer sealing gasket 18 extends, considered in the cross section from the fitting 13, in the direction of the surface associated support of the separation wall 15. The inner sealing gasket 17 extends, starting from the area of the root 34, correspondingly concave in the direction of the edge of the front edge of the fitting 13 for attachment by insertion with it.

Through the immediate fixing of the two sealing gaskets 17 and 18 on the retaining plate 9, a replacement of the sealing gaskets is advantageously carried out with each change of the filter bag.

In this embodiment, two sealing planes are achieved, a sealing plane between the external sealing gasket 18 and the separation wall 15 and a sealing plane between the internal sealing gasket 17 and the fitting 13.

As can also be recognized from the representation in Figure 9, there is also the possibility of injection molding both sealing joints 17 and 18, in particular the internal sealing joint 17 on the front side of the fitting 13 and the outer sealing gasket 18 on the surface of the retaining plate 9 which is directed towards the separation wall 1. Also here is the advantage of permanent replacement of the external sealing gasket 18 with each change of the filter bag. Two sealing planes result here, a sealing plane between the outer sealing gasket 18 and the separation wall 15 and a sealing plane between the inner sealing gasket 17 and the retaining plate 9.

Finally, as shown in Figure 10, on the retaining plate 9, associated with the edge of the inlet orifice of the current 10, a sealing rib 35 can be provided, which projects axially in the direction of the fitting 13. This rib The sealing seal is formed, in the embodiment shown, in one piece with the retaining plate 9. This sealing rib 35 radially supports the inner sealing gasket 17 injection molded in this example in the embodiment of the front edge of the fitting 13. Correspondingly, this sealing gasket 17 is supported in the direction of pressure drop, which further elevates the sealing seat.

A sealing rib of this type can also be provided, for example, also by covering the outer sealing gasket 18 in the associated area of the separation wall 15, so as to also achieve a support of the external sealing gasket 18 in the direction of pressure drop.

Through the proposed solutions, it is ensured that in the case of a deterioration of a sealing gasket, raw gas (contaminated air) does not reach pure gas (purified air). Through the arrangement of two sealing seals 17 and 18 arranged essentially coaxially with each other and the annular space 22 which is adjusted in this case a pressure gate is created, which prevents air or dirt from coming from one side to the other of the sealing gasket, since it should move against the pressure drop.

List of reference signs

one

Dust vacuum

2

Basic device

3

Filter box

4

Filter bag

5

Electric cable

6

Mango

7

Activation handle

8

Supplementary device

9

Retention plate

10

Orifice of admission of the current

eleven

Dust bag

12

Circulation channel

13

Fitting

14

Ground

fifteen

Separation wall

16

Annular space

17

Seal

18

Seal

19

Hole

7

twenty

Annular Interstitium

twenty-one

Connection hole

22

Annular space

2. 3

Holes

5

24 Union section

25

Arm

26

Sealing ring

27

Shutter section

28

Necklace

10

29 Annular cord

30

Annular recess

31

Double seal

32

Cross union

33

Holes

fifteen

3. 4 Root zone

35

Sealing rib

T

Separation plane

P1

First pressure zone

twenty

P2 Second pressure zone

P3

Third pressure zone

x

Axis

Claims (15)

1.-Dust vacuum cleaner (1) with a filter bag (4) arranged in said dust vacuum cleaner, in which the filter bag (4) has a retention plate (9) with a current inlet port (10), whose current inlet hole (10) is associated with a fitting (13) that delimits a first pressure zone (P1 ), in which a sealing gasket (17) is arranged between the retention plate (9) and the fitting (13), characterized in that the retention plate (9) is hermetically sealed by means of a second sealing gasket ( 18) towards a second pressure zone (P2) formed by a separation wall (15) fixed in the housing. 2. Powder aspirator according to claim 1, characterized in that both gaskets (17, 18) are exposed on one side to the pressure of a third pressure zone (P3). 3. Powder vacuum according to claim 2, characterized in that the pressure in the third pressure zone (P3) is higher than the respective pressure in the first pressure zone (P1) and in the second pressure zone ( P2). 4. Dust vacuum according to one of the preceding claims, characterized in that one of the sealing gaskets (17, 18) is fixedly connected to the retaining plate (9) and the other sealing gasket (18, 17) It is fixedly connected to the fitting (13). 5. Dust vacuum cleaner according to one of claims 1 to 3, characterized in that one of the sealing gaskets (17, 18) is fixedly connected to the retaining plate (9) and the other sealing gasket (18, 17) is fixedly connected to the separation wall (15). 6. Dust vacuum cleaner according to one of claims 1 to 3, characterized in that one of the sealing gaskets (17, 18) is fixedly connected to the fitting (13) and the other sealing gasket (18, 17) It is fixedly connected to the separation wall (15). 7. Powder vacuum according to one of claims 1 to 3, characterized in that the two sealing gaskets (17, 18) are fixedly connected with the retaining plate (9), with the fitting (13) or with the separation wall (15). 8. Powder vacuum according to one of claims 4 to 7, characterized in that the fixed connection of the sealing gasket (17, 18) with the fitting (13) and / or with the retaining plate (9) and / or with the separation wall (15) is achieved by means of an insert fixing bracket. 9. Powder vacuum according to one of claims 4 to 7, characterized in that the fixed connection of the sealing gasket (17, 18) with the fitting (13) and / or with the retaining plate (9) and / or with the separation wall (15) is achieved through integral shaping. 10. Powder vacuum according to one of the preceding claims, characterized in that the two sealing gaskets (17, 18) are configured in one piece with each other. 11. Powder vacuum according to one or more of the preceding claims, characterized in that the first sealing gasket (17) is configured so that it widens radially outwardly in relation to the fitting (13). 12. Powder vacuum according to claim 11, characterized in that the widening of the first seal (17) is provided in any case adjacent to the sealing area. 13. Powder aspirator according to one of the preceding claims, characterized in that the second sealing gasket (18) is configured so that it widens radially in relation to the fitting (13). 14. Powder aspirator according to claim 13, characterized in that the widening of the second sealing gasket (18) is provided in any case adjacent to the sealing zone. 15. Powder vacuum according to one of the preceding claims, characterized by a park in the retaining plate (9) and / or in the separation wall (15) fixed in the housing a circumferential sealing lip (35) is configured. , against which a seal (17, 18) is supported in the direction of pressure drop.