Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/20—Means for cleaning filters
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L5/00—Structural features of suction cleaners
  • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
  • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
  • A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
  • A47L5/365—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back of the vertical type, e.g. tank or bucket type
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
  • A47L9/12—Dry filters
  • A47L9/122—Dry filters flat

Definitions

• the invention relates to a vacuum cleaner with a dirt collecting container having a suction inlet and at least one filter and a
• Suction line is in flow communication with a suction unit, and with a scavenging air supply means for supplying scavenging air into the suction line downstream of the filter, wherein the scavenging air supply means comprises at least one scavenging air opening and a closing body with a suction side facing the end side and a suction line facing away from the rear, between a closed position in which it closes the scavenging air opening, and a release position in which it releases the scavenging air, is movable back and forth.
• the vacuum cleaner has at least one filter which is arranged in the flow path between the dirt collecting container and the suction unit. At the side of the at least one filter facing the dirt collecting container, dirt particles gradually accumulate during the suction operation of the vacuum cleaner. It is therefore necessary to clean off the at least one filter from time to time, since otherwise the suction flow generated by the suction unit in the region of the filter experiences a strong pressure loss, so that an effective suction operation of the vacuum cleaner is no longer guaranteed.
• the at least one filter can be charged with purging air.
• the vacuum cleaner on a scavenging air supply means for supplying scavenging air into the suction downstream of the filter.
• the scavenging air supply device comprises at least one scavenging air opening, which is in flow communication with the suction line.
• the scavenging air opening can optionally be closed and released by means of a closing body.
• the closing body has an end side facing the suction line and a rear side facing away from the suction line. In its closed position, the closing body closes the scavenging air opening and in its release position, the closing body releases the scavenging air opening. It can be moved back and forth between the closed position and the release position.
• the closing body During normal suction operation of the vacuum cleaner, the closing body assumes its closed position. To clean the filter, the closing body is moved to the release position. In the release position, scavenging air can flow into the suction line and act on the side of the at least one filter remote from the dirt collecting container. This mechanically shakes the filter. At least part of the inflowing purging air can flow through the at least one filter in the counterflow direction, that is to say counter to the direction of the suction flow prevailing during normal suction operation. Adhesive particles adhering to the filter are detached by the mechanical vibration of the filter caused by the scavenging air and by the scavenging air flowing through the filter in the countercurrent direction.
• the vacuum cleaner described therein comprises a scavenging air supply device with a tubular housing, in which a sleeve-shaped closing body is manually displaceable in the longitudinal direction against the action of a return spring.
• the closing body has side openings in a similar manner as the tubular housing.
• the lateral openings of the closing body can be aligned in a release position in alignment with the scavenging air openings of the housing, so that scavenging air can flow via the scavenging air openings and the sleeve-shaped closing body into the area of the suction line downstream of the filter for cleaning the filter.
• the closing body assumes a closed position, in which its lateral openings are arranged axially offset from the scavenging air openings and thus the flow connection between the scavenging air openings and the suction line is interrupted.
• the transition of the closing body from its closed position in the release position takes place in that it is moved by the user of the vacuum cleaner coaxially with the longitudinal axis of the housing of the scavenging air supply.
• the filter can be applied for cleaning in countercurrent direction with scavenging air.
• the purge air supply device used for this purpose comprises a hood-shaped closing body whose rear side facing away from the suction line is exposed to atmospheric pressure and on whose end face facing the suction line the pressure prevailing in the suction line acts. With the aid of a permanent magnet, the closing body is held in its closed position. For filter cleaning, the prevailing at the end of the closing body vacuum is increased. This has the consequence that the closing body is displaced against the magnetic holding force acting on it in the direction facing the filter. In doing so, he releases the purging air opening, so that purging air can act on the filter in the countercurrent direction.
• the scavenging air supply means comprises a plate-shaped closing body, which is held by means of an electromagnet in its closed position. After switching off the exciting current of the electromagnet of the closing body is due to the rear side acting on it atmospheric pressure in its release position, by being moved in the direction of the filter facing.
• Object of the present invention is to develop a vacuum cleaner of the type mentioned in such a way that it enables effective cleaning of the at least one filter with low production costs.
• the closing body is movable by acting on its rear side facing away from the suction with negative pressure against a restoring force in its release position.
• the transition of the closing body from its closed position to its release position is characterized in that the closing body is acted upon on its back with negative pressure, under the action of which it is movable against an acting restoring force in its release position.
• the closing body In the normal suction operation, in which the closing body assumes its closed position, can act on the back of a pressure which is greater than the prevailing pressure in the suction line, for example atmospheric pressure, whereas its end facing the filter also in the suction line downstream of the filter prevailing pressure acts.
• the closing body is thereby reliably held in its closed position, without additional retaining elements must be used.
• the transition of the closing body of the closed position in its release position is effected in that the rear side of the closing body is subjected to negative pressure. Under the effect of the negative pressure, the closing body can be moved in the direction away from the filter, so that it releases the purging air opening and purging air can flow into the suction line.
• the rear side of the closing body can be brought into fluid communication with the suction unit for applying negative pressure, wherein the area of the rear side of the closing body which can be acted upon by negative pressure is greater than the area of the end face of the closing body which can be acted upon by the pressure prevailing in the suction line.
• a flow connection is made to trigger a filter cleaning between the suction unit and the back of the closing body, so that the closing body can be acted upon at the back with the negative pressure provided by the suction unit.
• On the front side of the closing body of the prevailing downstream of the filter negative pressure of the suction which is also in communication with the suction unit acts.
• the closing body acts at the transition of the closing body from the closed position to the release position both the front side and a negative pressure at the back.
• the closing body is configured such that the area of the closing body which can be acted upon with negative pressure on the rear side is greater than the area of the closing body which can be subjected to negative pressure on the front side.
• the area differences ensure that the closing body reliably passes into its release position due to the back-loading with negative pressure.
• purging air can flow into the suction line downstream of the filter via the at least one purging air opening and the filter can flow through in the countercurrent direction.
• the scavenging air flowing into the suction line increases the pressure in the suction line and this in turn supports the transition of the closing body from its closed position into its release position, since at that time the back of the
• Closing body of the vacuum generated by the suction unit acts. If the closing body, after the filter has been cleaned, should return to its closed position, it is only necessary to interrupt the flow connection between the suction unit and the rear side of the closing body. As a result, the pressure acting in the rear on the closing body can increase, whereas the pressure in the suction line downstream of the filter, which also acts on the closing body on the front side, is reduced due to the continued operation of the suction unit. The pressure difference acting on the closing body is thus directed again in the direction of its closed position, so that the closing body assumes its closed position and the normal suction operation of the vacuum cleaner can be continued.
• housing in which the closing body is movably supported, wherein it defines a pressure chamber of the housing, which is brought via a connecting device with the suction unit in flow communication.
• the housing of the scavenging air supply device in combination with the closing body movably held in the housing defines a pressure chamber.
• the pressure prevailing in the pressure chamber, the back on acts in combination with the end face acting on the closing body pressure of the suction line determines the position occupied by the closing body the closing body.
• a higher pressure can prevail in the pressure chamber than in the suction line, in particular atmospheric pressure.
• the pressure chamber via a connecting device with the suction unit is brought into flow communication, so that the pressure chamber is sucked from the suction unit and thereby the back acting on the closing body pressure is reduced.
• This has the consequence that the closing body transitions into its release position and purging air can flow into the suction line downstream of the filter via the at least one purging air opening in order to flow through the filter in the counterflow direction.
• a suction hose which is connected at one end to the suction inlet of the dirt collecting and the other end can be brought into flow communication with the pressure chamber.
• a suction hose is connected to the suction inlet of the dirt collecting container, which can carry a suction nozzle, for example a floor nozzle or a crevice nozzle, at its free end facing away from the dirt collecting container. If a filter cleaning to be triggered, it is only necessary for this that the free end of the suction hose is brought into flow communication with the pressure chamber.
• the pressure chamber has a suction connection, for example a suction connection, which can be detachably connected to the free end of the suction hose or a suction nozzle mounted on the free end of the suction hose. It can be provided, for example, that the free end of the suction hose can be inserted into a suction nozzle or placed on a suction nozzle, which opens into the pressure chamber.
• the flow connection between the pressure chamber and the suction unit is produced via the suction hose and the dirt collecting container of the vacuum cleaner.
• the connecting device has a connecting line which connects the suction line to the pressure chamber, wherein in the connecting line an actuatable blocking element is connected for selectively opening and closing the connecting line.
• the closing body can be acted upon at the back with negative pressure by the User releases a connection line between the suction line and the pressure chamber.
• it can actuate a shut-off member, which is connected in the connecting line, so that the flow connection between the suction line and the pressure chamber is released via the connecting line.
• the back of the closing body can be acted upon by the connection line and the pressure chamber with negative pressure.
• a throttle element is connected in the connecting line.
• the throttle element ensures that at the transition of the closing body in its release position which takes place by the influx of purging air pressure increase in the suction downstream of the filter acts only with a time delay via the connecting line in the pressure chamber and thus on the back of the closing body. If the closing body releases the at least one purging air opening, the pressure in the suction line and thus also the pressure in the pressure chamber increase via the connecting line.
• a throttling element is connected in the connecting line, the pressure in the pressure chamber increases more slowly than in the suction line, so that the closing body initially remains in its release position despite the existing over the connecting line flow connection between the pressure chamber and the suction and the filter accordingly can be effectively cleaned.
• pressure equalization occurs between the pressure chamber and the suction line. This has the consequence that the closing body passes into its closed position due to the restoring force acting on it, in which it closes the at least one scavenging air opening.
• the connecting device comprises a valve which connects the pressure chamber with the environment of the vacuum cleaner in a first valve position and that connects the pressure chamber with the suction unit in a second valve position.
• the valve can be operated by the user. During the normal paint suction operation, the valve assumes its first valve position, in which it provides a flow connection between the pressure chamber and the surroundings of the suction unit, so that the back of the closing body can be acted upon with atmospheric pressure.
• the user can operate the valve so that it assumes its second valve position, in which it establishes a flow connection between the pressure chamber and the suction unit. As a result, the pressure in the pressure chamber is lowered and the closing body can pass into its release position.
• the valve can be operated again so that it again assumes its first valve position and releases the flow connection between the pressure chamber and the surroundings of the vacuum cleaner.
• valve is connected in the connecting line, via which the pressure chamber is connected to the suction line, as has already been explained above.
• the valve can assume the function of the shut-off in such an embodiment.
• the housing of the scavenging air supply device has a housing wall, on which the closing body is movably supported with the interposition of a sealing device.
• the sealing device can be designed as a gap seal, in which the closing body and the housing wall each form a gap surface, which are arranged at the smallest possible distance from each other. The smaller the distance between the gap surfaces and the longer the gap formed between them, the greater the sealing effect achievable by means of the gap seal.
• the sealing device has a sealing ring and an associated sealing surface.
• the sealing ring may be configured, for example, in the form of a piston ring, which is arranged in an annular groove of the closing body and slidably abuts against a sealing wall arranged on the housing wall.
• the closing body is preferably designed as a piston, which is held displaceably in the housing.
• the piston comprises a cylindrical piston wall which slidably bears against a cylindrical housing wall with the interposition of a sealing device.
• the sealing device arranged between the housing wall and the closing body has a membrane via which the closing body is connected to the housing wall.
• the membrane allows a reliable sealing of the closing body relative to the housing of the scavenging air supply device, wherein the closing body, however, can be moved back and forth between the closed position and the release position.
• the membrane is integrally connected to a sealing ring fixed to the closing body, which in the closed position of the closing body sealingly against a surrounding the scavenging air sealing surface, which is preferably designed as a sealing edge, can be applied.
• the closing body is plate-shaped in a preferred embodiment.
• the closing body In order to avoid that the closing body canted in its movement between the closed position and the release position, it is advantageous if the closing body is guided displaceably in a guide member.
• the closing body is positively connected to the guide member.
• the guide part has a guide sleeve into which the closing body dips with a guide pin. It is advantageous if the closing body, including the guide pin, is configured in the form of a one-piece component. The manufacturing and assembly costs can be further reduced.
• the closing body is in the closed position at an edge of the scavenging air opening sealingly and outside the edge of the scavenging air at the front can be acted upon by a pressure which is higher than the prevailing during the suction in the suction pressure, for example atmospheric pressure ,
• the end face of the closing body is divided in the closed position into a first area and a second area. The subdivision is effected by the edge of the scavenging air opening, against which the closing body bears in a sealing manner.
• the first region of the end face covers the scavenging air opening, and the second region of the end face is arranged outside the edge of the scavenging air opening.
• the first area is acted upon by the negative pressure prevailing in the suction line, whereas the second area of the front side can be acted on with a higher pressure.
• the pressure prevailing in the second region of the end face assists the movement of the closing body, starting from its closed position in its release position, so that the closing body abruptly assumes its release position.
• the housing of the scavenging air supply device has a scavenging air channel which is connected to the scavenging line via the scavenging air opening, wherein the scavenging air channel surrounds the scavenging air opening in the circumferential direction.
• the scavenging air duct arranged outside the edge of the scavenging air opening frontal region of the closing body can be acted upon, for example, with atmospheric pressure.
• the scavenging air can flow into the suction channel downstream of the filter via the scavenging air channel and the scavenging air opening then released by the closing body and flow through the filter in the countercurrent direction.
• Figure 1 is a schematic partial sectional view of a first embodiment of a vacuum cleaner according to the invention
• Figure 2 is a schematic partial sectional view of a second embodiment of a vacuum cleaner according to the invention.
• Figure 3 is a schematic partial sectional view of a third embodiment of a vacuum cleaner according to the invention.
• FIG. 1 shows a schematic partial sectional view of a first embodiment of a vacuum cleaner according to the invention with a dirt collecting container 10, which has a suction inlet 12 and a suction outlet 14.
• the suction outlet 14 is covered within the dirt collecting container 10 by a filter 16.
• a suction line 18 connects.
• the suction line 18 is shown only partially in FIG. It connects the dirt collecting container 10 with a suction unit, which is known per se and therefore not shown in the drawing, by means of which the suction line 18 and the dirt collecting container 10 are pressurized with negative pressure. can be beat.
• a suction hose 20 is connected, which is shown in Figure 1 partially schematically in the form of a dotted line 21 and at its free, the suction inlet 12 remote end carries an angled pipe section 22, to the conventional manner in a conventional suction nozzle can be connected.
• a suction flow forms, so that dirt and liquid can be sucked into the dirt collecting container 10 via the suction hose 20.
• Suction air then flows through the filter 16 and entrained dirt and liquid droplets are deposited on the filter 16.
• the suction flow is illustrated in FIG. 1 by the arrows 24.
• a scavenging air supply device 26 is arranged with a housing 28, which forms a scavenging air channel 30, which communicates via a scavenging air opening 32 with the suction line 18, and coaxial with the scavenging air 32 comprises a cylindrical housing top 34 with a top wall 36. Inside is formed on the ceiling wall 36, a spring holder in the form of a holding pin 38 and radially offset from the centrally aligned holding pin 38, the top wall 36 has a suction port 40, to the outside of a pipe socket 42 connects.
• a closing body 44 is arranged, which is formed in the form of a stepped piston. It has a filter 12 facing the lower piston portion 46, which dips into the scavenging air opening 32, wherein it occupies a distance from the edge 48 of the scavenging air opening 32.
• the lower piston section 46 merges via a radial extension 50 into an upper piston section 52.
• the upper piston portion 52 slides with the interposition of a sealing ring 54 along an inner side sealing surface of a cylinder wall 56 of the upper housing part 34 along.
• the closing body 44 in the housing 28 defines a pressure chamber 58, which can be acted upon by the suction connection 40 with negative pressure. This will be explained in more detail below.
• the retaining pin 38 is surrounded by a helical return spring 60, which is supported on the one hand on the inside of the top wall 36 and on the other hand on the back 62 of the closing body 44 and thereby acts on the closing body 44 directed to the filter 16 resilient restoring force.
• the edge 48 of the scavenging air opening 32 has, on its upper side facing away from the suction line 18, a collar-shaped sealing edge 76.
• the sealing edge 76 forms a sealing surface, which cooperates with a sealing ring 78, which is arranged on the radial extension 50 of the closing body 44.
• the closing body 44 can between a closed position shown in Figure 1, in which the sealing ring 78 sealingly abuts the sealing edge 76, so that the scavenging air opening 32 is closed, and a release position, not shown in the drawing, in which the closing body 44 in the filter 16 facing away upward direction, so that the sealing ring 78 occupies a distance from the sealing edge 76 and thereby the scavenging air opening 32 is released, are moved back and forth.
• the user can connect the pressure chamber 58 via the suction hose 20 with the dirt collecting 10. This is shown in FIG.
• the user leads for this purpose, the free end of the suction hose 20, that is, the pipe section 22, in the pipe socket 42, so that the end face of the pipe section 22 sealingly abuts a disposed within the pipe socket 42 and the suction port 40 surrounding sealing ring 80 sealingly.
• the rear side 62 of the closing body 44 is acted upon by the suction unit 20 of the vacuum cleaner 20, the dirt collecting container 10 and the suction line 18 from the suction unit of the vacuum cleaner.
• the stage design of the closing body 44 has the consequence that the rear side acted upon by the negative pressure prevailing within the pressure chamber 58 of the closing body 44 is greater than the area of the end face 82 of the closing body 44 which is acted upon by the vacuum prevailing inside the suction line 18
• Namely in the suction line 18 prevailing negative pressure applied surface extends namely only over the end wall 64 and the region of the radial extension 50, which is within the surrounded by the sealing edge 76 annular space, whereas the pressure prevailing in the pressure chamber 58 negative pressure surface 62 of the closing body 44 extends over both the back of the end wall 64 and over the back of the complete radial extension 50.
• the different surface expansions have the consequence that the closing body 44 moves under pressure from its closed position shown in Figure 1 in its release position when it exposes its back, in which it releases the flow connection between the purge air duct 30 via the scavenging air opening 32 to the suction line 18. Since the scavenging air duct 30 communicates with the surroundings of the vacuum cleaner via inlet openings 84, flushing air can thus flow into the suction line 18 via the inlet openings 84, the scavenging air duct 30 and the scavenging air opening 32 in the release position of the closing body 44, wherein at least part of the scavenging air flows into the scavenging air Filter 16 flows counter to the direction of the prevailing during the normal suction suction flow 24. In addition, the filter 16 is mechanically shaken by the sudden inflowing scavenging air. This results in an effective cleaning of the filter 16.
• the closing body 44 Since in this position, the scavenging air opening 32 is sealed by the closing body 44, then reduced due to the continued operation of the suction of the end face acting on the closing body 44 pressure and with time delay due to the throttling action of the filter 16, the pressure in the dirt collecting 10 and in the pressure chamber 58, so that the closing body 44 is moved back into its release position. As long as the pressure chamber 58 is in fluid communication with the dirt collecting container 10 via the suction hose 20, the closing body 44 carries out a continuous back and forth movement. movement, wherein the filter 16 is applied at successive times with short pressure pulses, which are caused by the incoming suction air. This supports the cleaning of the filter 16.
• the movement of the closing body 44 from its closed position into its release position is assisted by the atmospheric pressure prevailing inside the scavenging air channel 30, which acts coaxially on the region of the radial extension 50 arranged outside the sealing edge 76.
• the atmospheric pressure acting on the radial extension 50 outside the sealing edge 76 intensifies the movement of the closing body 44 in its release position.
• the fixed to the closing body 44 sealing ring 78 thus lifts abruptly from the sealing edge 76, so that the scavenging air flowing through the scavenging air 32 in the suction 18 flushing the filter 16 impulsively applied.
• the user can cancel the flow connection between the dirt collector 10 and the pressure chamber 58 again by pulling the pipe section 22 out of the pipe socket 42.
• the suction port 40 is then open again and in the pressure chamber 58 is again atmospheric pressure, under the action of the closing body 44 is reliably held in its closed position. The normal suction operation of the vacuum cleaner can therefore be continued again.
• FIG. 2 shows a second embodiment of a vacuum cleaner according to the invention is shown schematically in a partial sectional view.
• This embodiment is similar to the first embodiment explained above with reference to FIG.
• the same reference numerals are used in Figure 2 as in Figure 1.
• reference is made to the foregoing explanations to avoid repetition.
• a plate-shaped closing body 94 is used, which carries the sealing ring 78, wherein the sealing ring 78 is integrally connected in the embodiment shown in Figure 2 with a membrane 96 which is fixed to the housing 28.
• the plate-shaped closing body 94 carries on its rear side facing away from the filter 16 62 for holding a closing spring 98, a retaining pin 100, and the front side carries the closing body 94 in a manner similar to the closing body 44 described above with reference to Figure 1, a guide pin 66 of a guide sleeve 68 is recorded.
• the pressure chamber 58 can be subjected to negative pressure via the suction hose 20, as has already been explained above with reference to FIG. Since the front side acted upon by the pressure prevailing in the suction 18 prevailing pressure surface of the closing body 94 is smaller than the rear side acted upon by the pressure prevailing in the pressure chamber 58 vacuum surface, the suction of the pressure chamber 58 leads also in the embodiment shown in Figure 2 to the Closing member 94 is moved from its closed position shown in Figure 2 in the direction away from the filter 16 in a release position in which the sealing body 78 fixed to the closing body 94 occupies a distance from the sealing edge 76, so that via the inlet openings 84, the scavenging air duct 30 and Purging air opening 32 Purging air can flow into the suction line 18 and act on the filter 16, wherein at least a portion of the purging air flows through the filter 16 in the counterflow direction.
• FIG. 3 schematically shows a third embodiment of a vacuum cleaner according to the invention in a partial sectional view. This embodiment is configured similarly to the second embodiment explained above with reference to FIG. For identical components, therefore, the same reference numerals are used in Figure 3 as in Figure 2. With respect to these components, reference is made to the foregoing explanations to avoid repetition.
• the pressurization of the pressure chamber 58 with vacuum is not carried out via the suction hose 20. Rather, the pressure chamber 58 in the embodiment shown in Figure 3 via a connecting line 102 is permanently connected to the suction line 18, wherein in the connecting line 102 a manually operated by the user directional control valve 104 is connected.
• the directional control valve 104 has a first valve position, in which it connects the pressure chamber 58 via a first flow channel 106 with the surroundings of the vacuum cleaner, so that 58 pressure can form in the pressure chamber, under the action of the closing body 94 in his shown in Figure 3 Closed position is held.
• the directional control valve 104 comprises a second valve position, in which it releases the connection between the pressure chamber 58 and the suction line 18 via the connecting line 102 via a second flow channel 108. Since the suction channel 18 is permanently in fluid communication with the suction unit, not shown in the drawing, the directional control valve 104 connects the pressure chamber 58 with the suction unit in its second valve position, so that the rear side of the closing body 94 is subjected to negative pressure by the suction unit in the manner already explained above can be .
• the connecting line 102 has a throttle point 110 in the form of a cross-sectional constriction. If the closing body 94 assumes its release position in the embodiment shown in FIG. 3, then scavenging air can enter into the already described manner Inlet pipe 18 flow. The purge air then passes via the connecting line 102 into the pressure chamber 58. Due to the throttle point 110, however, the pressure equalization takes place with a time delay. This has the consequence that even in the embodiment shown in Figure 3, the closing body 94 performs a continued reciprocating movement between its closed position and its release position.
• the respective closing body 44 or 94 in its closed position is acted upon at the back with atmospheric pressure. This pressurization keeps the closure body 44 and 94 in its closed position.
• the user via the suction hose 20 or via the connecting line 102 and the directional control valve 104 between the suction unit of the vacuum cleaner and the pressure chamber 58, so that the back of the closing body 44 and 94 is subjected to negative pressure and thereby the closing body 44 or 94 passes into its release position.
• the vacuum cleaner according to the invention is characterized by an effective cleaning of the filter 16, wherein the vacuum cleaner is easy to handle and can be produced inexpensively.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Nozzles For Electric Vacuum Cleaners (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Filters For Electric Vacuum Cleaners (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=44119217

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (11)

Citations (5)

Family Cites Families (3)

• 2010
  • 2010-05-31 DE DE102010029524A patent/DE102010029524A1/de not_active Withdrawn
• 2011
  • 2011-05-24 CN CN201180026747.9A patent/CN102917628B/zh not_active Expired - Fee Related
  • 2011-05-24 EP EP11722785.0A patent/EP2575587B1/de not_active Not-in-force
  • 2011-05-24 WO PCT/EP2011/058424 patent/WO2011151219A1/de active Application Filing

Patent Citations (5)

Also Published As

Similar Documents

Legal Events