US20090205159A1 - Vacuum cleaner - Google Patents
Vacuum cleaner Download PDFInfo
- Publication number
- US20090205159A1 US20090205159A1 US12/322,072 US32207209A US2009205159A1 US 20090205159 A1 US20090205159 A1 US 20090205159A1 US 32207209 A US32207209 A US 32207209A US 2009205159 A1 US2009205159 A1 US 2009205159A1
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- United States
- Prior art keywords
- closing
- vacuum cleaner
- coil
- valve
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 238000000605 extraction Methods 0.000 claims abstract description 9
- 230000015556 catabolic process Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000006698 induction Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
- B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
- F16K31/402—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a diaphragm
- F16K31/404—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a diaphragm the discharge being effected through the diaphragm and being blockable by an electrically-actuated member making contact with the diaphragm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/28—Making use of vacuum or underpressure
Definitions
- the invention relates to a vacuum cleaner with a dirt collection tank which has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one extraction line, and with at least one external air inlet which opens into the extraction line downstream of the at least one filter and can be closed by means of at least one closing valve, wherein the at least one closing valve has a valve member which can be moved back and forth between a closing position, in which it abuts on a valve seat, and an open position, in which it is spaced from the valve seat, wherein it is acted upon permanently by a closing spring with a closing force and in the closing position, in addition, by a magnetic holding device with a magnetic holding force.
- Dirt and, preferably, also liquid can be sucked up from a surface by means of such vacuum cleaners in that the dirt collection tank is acted upon with a vacuum with the aid of at least one suction unit so that a suction flow is formed and dirt and liquid can be sucked into the dirt collection tank.
- the vacuum cleaners have one or more filters which are arranged in the flow path between the dirt collection tank and the at least one suction unit and serve to separate solids from the suction flow. During suction operation, dirt particles are increasingly deposited on the side of the at least one filter facing the dirt collection tank and so the filter or filters need to be cleaned after a certain length of time.
- the side of the filter facing away from the dirt collection tank can be acted upon with external air in that at least one closing valve is opened so that external air can flow into the at least one extraction line from the external air inlet and act upon the side of the at least one filter facing away from the dirt collection tank.
- the object of the present invention is to develop a vacuum cleaner of the generic type further in such a manner that it makes a particularly effective cleaning of the at least one filter possible.
- the magnetic holding device comprises an electromagnet with a magnetic core and a coil which can be acted upon with current for the purpose of closing the closing valve, wherein at least one electrical component, which takes up at least some of the energy stored in the coil when the current acting on the coil ceases, is connected in parallel to the coil.
- At least one closing valve is used, the valve member of which can be moved back and forth between a closing position and an open position. Irrespective of its position, the valve member is acted upon by a closing spring with a closing force in the direction of its closing position. In the closing position, the closing member is acted upon, in addition, by a magnetic holding force, with the aid of which it is ensured that the closed closing valve reliably closes the flow connection between the inlet for external air and the side of the filter facing away from the dirt collection tank. In this position, the normal suction operation of the vacuum cleaner takes place. If the at least one filter is intended to be cleaned, at least one closing valve is opened.
- the closing valve has an electromagnet which can be acted upon with current for the purpose of closing the closing valve.
- the supply of current to the electromagnet is interrupted for a short time so that the holding force acting on the valve member ceases abruptly.
- the valve member is subject to a difference in pressure since the pressure of the external air, i.e., normally atmospheric pressure prevails on its side facing away from the filter whereas the vacuum of the extraction line is present at its side facing the filter.
- the magnetic holding force ceases, this difference in pressure results in the valve member transferring into its open position contrary to the spring force of the closing valve.
- the magnetic holding force In order to bring about as abrupt an action on the filter with external air as possible, it is provided in accordance with the invention for the magnetic holding force to cease after as short a time as possible. For this reason, at least one electrical component, which takes up at least some of the energy stored in the coil when the current acting on the coil ceases, is connected in parallel to the coil.
- the coil forms a large inductivity for the electrical control circuit of the coil. When the supply of current is interrupted, the inductivity results in a high countervoltage on account of self-inductance. This countervoltage is short-circuited via the at least one electrical component connected in parallel to the coil, wherein this component takes up at least some of the energy stored in the coil.
- the freewheeling diode ensures that an induced countervoltage at the coil is short-circuited.
- the freewheeling diode does, however, absorb only very little of the energy originally stored in the magnetic field of the electromagnet when the coil is short-circuited. Therefore, at least one electrical component which takes up energy is connected in series to the freewheeling diode.
- an ohmic resistor may be used, for example, or also a transzorb diode. At least some of the induced countervoltage is passed to the electrical component taking up energy when the current acting on the coil ceases. Therefore, the magnetic field of the electromagnet which prevails during normal suction operation can be broken down within a very short period of time.
- a freewheeling diode and a Zener diode which is polarized in the opposite direction to the freewheeling diode and is connected in series to it, are connected in parallel to the coil.
- an induced countervoltage can be short-circuited via the freewheeling diode. Since this absorbs only a little of the energy originally stored in the coil, a Zener diode, which is polarized in the opposite direction, is connected in series to the coil.
- the Zener diode is, therefore, connected in a reverse direction with respect to the countervoltage of the coil generated by way of self-inductance and so a not inconsiderable voltage drops away at the Zener diode when the supply of current to the coil is switched off.
- the magnetic field of the electromagnet which prevails during normal suction operation, can be returned practically to zero in a particularly short period of time by means of the Zener diode.
- the magnetic holding force which keeps the valve member in its closing position when current acts on the coil, breaks down within a very short period of time and the valve member can lift away from the associated valve seat.
- the Zener diode preferably has a breakdown voltage of more than 50 V. This has the advantage that the induction current of the coil can be returned practically to zero within a very short period of time by means of the Zener diode.
- the breakdown voltage of the Zener diode can, for example, be approximately 56 V.
- the coil and the at least one component connected in parallel to the coil can preferably be connected to a source of AC voltage via an electrical switching unit and a rectifier unit.
- the electrical switching unit makes it possible to carry out the cleaning of the filter as a function of the drop in pressure at the filter and/or dependent on time.
- a pressure sensor may be arranged both upstream and downstream of the filter and for the supply of current to the coil to be interrupted for a short time as a function of the pressures detected by the sensors in order to carry out cleaning of the filter.
- cleaning of the filter may be carried out at preferably uniform time intervals.
- the electromagnet normally has an iron core, onto which the coil is wound.
- the iron core may be statically charged on account of dirt particles flowing past.
- the static charge can assume values which represent a hazard, in particular, for the electrical switching unit connected to the coil.
- the control of the electromagnet may be impaired.
- the iron core is, therefore, connected via a potential equalization line to a reference potential predetermined externally.
- the reference potential can be earth potential or also an external DC or AC voltage potential.
- the potential of the iron core can be balanced with the external reference potential via the potential equalization line. As a result, a static charging of the iron core, which impairs the control of the electromagnet, is avoided. In particular, a very short-time interruption of the supply of current to the electromagnet can be impaired by a static charging of the iron core.
- the potential equalization line connects the iron core to a mains voltage supply connection, wherein at least one ohmic resistor is connected into the potential equalization line.
- the ohmic resistor preferably has resistance values of at least 10 M ⁇ , in particular, resistance values of approximately 15 to 25 M ⁇ .
- a first ohmic resistor can, for example, have a resistance value of approximately 8 M ⁇ and a second ohmic resistor can have a resistance value of approximately 12 M ⁇ .
- the use of different ohmic resistors has the advantage that during assembly of the vacuum cleaner the risk is reduced of two low-impedance resistors being used by mistake. The electrical safety of the vacuum cleaner is improved as a result.
- the movable valve member is held reliably in its closing position with the aid of the electromagnet used in accordance with the invention.
- the supply of current to the electromagnet is interrupted for a short time.
- the electromagnet is arranged on a valve holding device which forms the valve seat and when the valve member has a magnetizable element which is associated with the electromagnet and forms a magnetic circuit with the electromagnet in the closing position of the valve member.
- the magnetizable element for example, an iron-bearing plate bundles the field lines of the electromagnet in the valve member so that it is kept reliably in its closing position due to the action of the magnetic holding force.
- the magnetic circuit is interrupted since the magnetizable element is also at a corresponding distance in relation to the electromagnet.
- the holding force exerted by the electromagnet has only a very short range.
- the valve member thus experiences a magnetic holding force only in the immediate area of the valve seat; the magnetic force is already so slight at a distance of approximately 2 mm between the electromagnet and the magnetizable element that it cannot return the valve member to its closing position.
- the closing spring is used to return the valve member.
- the at least one component which is connected in parallel to the coil and takes up at least some of the energy stored in the coil that the magnetic holding force ceases within a very short period of time, for example, within ten milliseconds when the supply of current to the electromagnet is interrupted.
- a short-time opening movement of the valve member can be achieved which is held in its closing position preferably with the aid of the magnetizable element on the electromagnet. It is of advantage when, in the closing position of the valve member, the magnetizable element abuts on the end side of the electromagnet, thereby forming a gap of air.
- the gap of air is preferably narrower than 1 mm. It can, for example, be less than 0.7 mm, in particular, approximately 0.5 mm.
- a particularly effective cleaning of the filter is achieved in one preferred configuration of the vacuum cleaner according to the invention in that the supply of current to the coil can be interrupted several times one after the other for a period of time of at the most 0.2 seconds at time intervals of less than 1 second. It may, for example, be provided for the supply of current to be interrupted two, three or even four times one after the other for approximately 100 milliseconds each at time intervals of approximately 0.5 seconds.
- the multiple, short-time interruption in the current results in the valve member performing a rapid opening and closing movement several times one after the other so that the at least one filter to be cleaned is acted upon with a pressure surge several times at short time intervals and has external air flowing through it. This results in an alternating mechanical load on the at least one filter, under the influence of which the filter or filters are cleaned effectively.
- the supply of current to the coil can preferably be interrupted several times one after the other for less than 0.2 seconds at time intervals of approximately 10 to approximately 30 seconds. It may be provided, for example, for the supply of current to the coil to be interrupted for a short time at uniform time intervals of, for example, 15 seconds.
- the current can, in particular, be interrupted three times one after the other for approximately 0.1 seconds at intervals of 0.5 seconds each.
- a flexible stop element is associated with the valve member and this acts on the valve member with a repulsion force in a position spaced in relation to the valve seat.
- a very short opening movement of the valve member can be achieved in a constructionally simple manner as a result of the flexible stop element, wherein the valve member is acted upon first of all only with the closing force of the closing spring, proceeding from its closing position. Only when the valve member has a certain distance in relation to the valve seat, will the flexible stop element become effective and act on the valve member with a repulsion force.
- the flexible stop element absorbs the movement energy of the valve member and accelerates it back in the direction of the valve seat.
- the closing valve can be closed again within a very short period of time, in particular, after a period of time of less than 0.2 seconds.
- the normal suction operation of the vacuum cleaner can, as it were, be carried on continuously and, nevertheless, an effective cleaning of the filter can be achieved.
- External air enters the dirt collection tank only for a very short period of time and so the suction flow in the area of the suction inlet of the dirt collection tank is not noticeably interrupted.
- the vacuum cleaner is, consequently, characterized by a constructively simple construction, wherein all the filters present can have suction air flowing through them at the same time during suction operation and wherein the entire side of the at least one filter which faces away from the dirt collection tank can be acted upon with external air due to a short-time opening of the at least one closing valve.
- the external air is supplied to the filter in an impact-like manner, wherein the at least one suction unit is permanently in flow connection with the filter, i.e., also during the time of its cleaning.
- the flexible stop element can be designed in different forms. It is preferably designed as a stop spring. This has a greater spring constant than the closing spring in one preferred configuration.
- the stop spring is, therefore, harder than the closing spring, i.e., a greater force is necessary to compress the stop spring than is the case for the closing spring.
- the stop spring can, like the closing spring, have a linear or also a non-linear characteristic. For example, it may be provided for the stop spring and/or the closing spring to become harder with increasing travel of the spring.
- the closing spring and the stop spring are designed as helical springs with different diameters, wherein one of the two helical springs surrounds the other helical spring in circumferential direction.
- the closing spring preferably surrounds the stop spring in circumferential direction. This has the advantage that the valve member abuts on the closing spring at a relatively large contact surface and is guided back into the closing position by the closing spring. The tilting stability of the valve member is improved as a result.
- an electromagnet in the freewheeling circuit of which at least one component taking up energy, for example, a freewheeling diode and a Zener diode, which is polarized in the opposite direction thereto, are connected in series to one another, with a closing spring which acts on the valve member permanently with a closing force and with a flexible stop element is of particular advantage since, as a result, the valve member can be reliably held in a sealing manner on the valve seat in its closing position and as a result of a very short-time interruption in the current the valve member can lift away from the valve seat for a period of time of less than 0.2 seconds on account of the difference in pressure acting on it and so the closing valve is opened.
- the valve member At a distance from the valve seat, the valve member meets the flexible stop element which acts on the valve member with a repulsion force in the direction towards the valve seat.
- the valve member again reaches the valve seat within a very short period of time.
- the closing spring has, in this respect, the function of returning the valve member to the area of the magnetic field of the electromagnet so that the valve member can be held on the valve seat during normal suction operation by the electromagnet which is again acted upon with current.
- the vacuum cleaner can have several filters. It has proven to be particularly advantageous when the vacuum cleaner comprises a single filter. It may, in particular, be provided for the filter to be acted upon with external air over its entire surface area as a result of simultaneous opening of all the closing valves.
- this merely has a single closing valve which is positioned on the side of a filter holding device with flow passages which faces away from the single filter.
- the closing valve being opened, the single filter is acted upon with external air over its entire surface area.
- the configuration of the vacuum cleaner according to the invention makes it possible for external air to act on the side of the at least one filter, which faces away from the dirt collection tank, for a short time during normal suction operation and for this air to be removed by suction within a short time by means of the suction unit which is in flow connection with the filter even when the closing valve is opened. It is favorable when the valve member carries out a continuous movement back into its closing position via its open position, proceeding from its closing position, during the cleaning of the filter.
- valve member will, first of all, be accelerated powerfully in the direction away from the valve seat when the closing valve is opened and, subsequently, braked powerfully with the aid of the closing spring and, preferably, with the aid of the flexible stop element and reversed in its direction of movement in order to be accelerated again in the direction towards the valve seat.
- the entire movement of the valve member proceeding from its closing position via the open position back into the closing position can take place in fractions of a second, in particular, in a period of time of less than 200 milliseconds.
- the at least one filter can preferably be acted upon with external air by means of the at least one closing valve whilst a vacuum is maintained in the opening area of a suction hose opening into the suction inlet. If the at least one closing valve is opened, the pressure on the side of the filter facing away from the dirt collection tank rises abruptly and is then reduced again. The abrupt rise in pressure causes an effective cleaning of the filter; since the rise in pressure does, however, drop again immediately due to the at least one suction unit, it does not lead to a complete interruption in the vacuum in the opening area of the suction hose opening into the suction inlet. On the contrary, a more or less continuous suction operation can be maintained.
- FIG. 1 shows a schematic sectional view of a vacuum cleaner according to the invention
- FIG. 2 shows an enlarged illustration of detail A from FIG. 1 and
- FIG. 3 shows a block diagram of a supply circuit for an electromagnet of the vacuum cleaner.
- a vacuum cleaner 10 is illustrated schematically with a lower part which forms a dirt collection tank 12 and with an upper part 14 which is placed on the lower part and accommodates a suction unit 16 .
- the dirt collection tank 12 comprises a suction inlet 18 , to which a suction hose 20 can be connected.
- a suction nozzle can be connected to the free end of the suction hose 20 which is not illustrated in the drawings in order to achieve a better overview.
- the upper part 14 forms a suction outlet 22 for the dirt collection tank 12 .
- a folded filter 24 is held on the suction outlet 22 and an extraction line in the form of a suction channel 26 is connected to the filter.
- the folded filter 24 is permanently in flow connection with the suction unit 16 via the suction channel 26 .
- the dirt collection tank 12 can be acted upon with a vacuum by the suction unit 16 via the suction channel 26 and the folded filter 24 and so a suction flow symbolized in FIG. 1 by the arrows 28 is formed, due to the action of which dirt can be sucked into the dirt collection tank 12 .
- the dirt particles can be separated from the suction flow 28 by means of the folded filter 24 .
- a closing valve 30 is arranged in the upper part 14 above the folded filter 24 and is illustrated in FIG. 2 on an enlarged scale. It comprises a valve holding device 32 which is arranged stationarily in the upper part 14 , forms a valve seat and interacts with a valve member in the form of a circular valve plate 34 .
- the valve plate 34 is acted upon with a closing force in the direction towards the valve holding device 32 by means of a closing spring 36 .
- the closing spring 36 has a linear characteristic and is clamped between the valve plate 34 and a plate-like filter holding device 38 which has a plurality of flow passages and is arranged stationarily in the upper part 14 .
- the filter holding device 38 has an outer annular collar 40 , which surrounds the adjacent end area of the closing spring 36 designed as a helical spring in circumferential direction, on its upper side facing the closing valve 30 .
- the valve plate 34 has an annular bead 41 , on which the closing spring 36 abuts on the outer side, on its underside facing the filter holding device 38 .
- the filter holding device 38 has a flexible stop element in the form of a stop spring 43 which, like the closing spring 36 , is designed as a helical spring and has a linear characteristic.
- the filter holding device 38 comprises on its upper side facing the closing valve 30 an inner annular collar 44 which is arranged concentrically to the outer collar 40 and in which the stop spring 43 engages with an end section.
- a guiding pin 46 is integrally formed on the valve plate 34 on the under side, aligned with the inner annular collar 44 , this guiding pin being surrounded by an end area of the stop spring 43 in the closing position of the valve plate 34 illustrated in FIG. 2 .
- the stop spring 43 is not subject to tensioning in the closing position of the valve plate, in contrast to the closing spring. Only when the valve plate 34 has lifted away from the valve seat of the valve holding device 32 will the stop spring 43 come to rest on the underside of the valve plate 34 and will be compressed somewhat during further movement of the valve plate 34 .
- the valve holding device 32 has a plurality of openings which are not illustrated in the drawings and which open into the valve seat, on which the valve plate 34 sealingly abuts when it takes up its closing position.
- the upper part 14 has a lateral opening 48 . External air can flow into the openings in the valve holding device 32 via the lateral opening 48 . If the valve plate 34 takes up a position which is spaced in relation to the valve holding device 32 and, therefore, also in relation to the valve seat, the lateral opening 48 is in flow connection with the suction channel 26 via the openings in the valve holding device 32 and external air can act on the side of the filter 24 facing away from the dirt collection tank 12 . If the valve plate 34 takes up its closing position, the flow connection between the suction channel 26 and the lateral opening 48 is interrupted.
- the valve holding device 32 has a magnetic holding device in the form of an electromagnet 50 with a magnetic core 51 which is surrounded by a magnetic coil 52 .
- the end of the electromagnet 50 on the outer side is formed by a cylindrical casing 53 which, like the magnetic core 51 , is produced from a magnetizable material.
- the casing 53 is surrounded in the circumferential direction by a guiding receptacle in the form of an annular space 55 , in which a guiding sleeve 56 engages which is integrally formed on the valve plate 34 on the upper side.
- the annular space 55 and the guiding sleeve 56 form guiding elements for the displaceable mounting of the valve plate 34 .
- the guiding sleeve 56 accommodates a magnetizable element in the form of an iron plate 58 which abuts on the free end side of the electromagnet 50 in the closing position of the valve plate 34 and forms a closed magnetic circuit in combination with the magnetic core 51 and the casing 53 .
- the closed magnetic circuit bundles the magnetic field lines of the electromagnet 50 .
- the supply of current to the electromagnet 50 is illustrated schematically in FIG. 3 .
- the magnetic coil 52 is in electrical connection with a rectifier unit 65 via a first current supply line 61 and a second current supply line 62 , the rectifier unit being connected to mains connections 71 and 72 via a first connection line 67 and a second connection line 68 .
- a source of AC voltage can be connected in a customary manner to the mains connections.
- An electrically controllable switching unit 74 is connected into the first current supply line 61 ; the supply of current to the magnetic coil 52 can be interrupted with the aid of this switching unit as a function of a control signal which is made available by a control unit of the vacuum cleaner 10 , which is not illustrated in the drawings, via a control connection 75 of the switching unit 74 .
- a freewheeling diode 79 and a Zener diode 80 connected in series to one another are connected in parallel to the magnetic coil 52 in a free-running line 77 , wherein the Zener diode 80 is polarized in the opposite direction to the freewheeling diode 79 .
- the magnetic core 51 and the casing 53 of the electromagnet 50 form a housing of the electromagnet 50 which is given the reference numeral 82 in FIG. 3 . It is produced from an electrically conductive material, in particular, from an iron material and is in electrical connection with the first connection line 67 via a potential equalization line 84 .
- a first ohmic resistor 86 and a second ohmic resistor 87 are connected into the potential equalization line 84 in series to one another.
- the resistance value of the first ohmic resistor is, for example, approximately 8 M ⁇ whereas the resistance value of the second ohmic resistor can, for example, be 12 M ⁇ .
- the magnetic coil 52 can be acted upon with current via the rectifier unit 65 and the switching unit 74 for the purpose of forming a magnetic holding force which keeps the valve plate 34 in its closing position.
- the supply of current can be interrupted for a short period of time by means of the switching unit 74 , for example, for a period of time of approximately 100 milliseconds.
- This induction voltage will be short-circuited via the freewheeling diode 79 and the Zener diode 80 so that the associated induction current of the magnetic coil 52 drops away practically completely within a very short time, for example, within approximately 10 milliseconds after the supply of current has been switched off, i.e., within approximately 10 milliseconds the magnetic field of the electromagnet 50 which prevails during normal suction operation breaks down completely.
- the Zener diode 80 is polarized in the opposite direction to the freewheeling diode 79 and is, therefore, operated in a reverse direction so that the breakdown voltage, which is approximately 56 V in the embodiment illustrated, drops away at the Zener diode.
- the suction unit 16 If the user switches the vacuum cleaner 10 on, the suction unit 16 is started and, at the same time, the magnetic coil 52 is supplied with current via the switching unit 74 and the rectifier unit 65 so that the valve plate 34 is acted upon by the electromagnet 50 with a magnetic holding force which keeps it reliably in its closing position.
- the suction unit 16 acts on the dirt collection tank 12 and the suction channel 26 with a vacuum so that dirt particles, like drops of liquid, can be sucked into the dirt collection tank 12 . Dirt particles are deposited at the filter 24 and so this gradually becomes clogged during normal suction operation.
- the supply of current to the magnetic coil 52 is therefore interrupted by means of the switching unit 74 several times for a short period of time at time intervals of, for example, 10 to 30 seconds, in particular, at time intervals of approximately 15 seconds. It may, for example, be provided for the supply of current to the magnetic coil 52 to be interrupted three times one after the other for approximately 0.1 seconds at intervals of 0.5 seconds each and for the normal suction operation to then be restarted for 15 seconds.
- the interruption in the supply of current results in the magnetic field of the electromagnet breaking down within a very short time, for example, within approximately 10 milliseconds on account of the use of the Zener diode 80 and, therefore, the magnetic holding force for the valve plate 34 ceases.
- this causes the valve plate 34 to lift away from the valve seat contrary to the action of the closing spring 36 on account of the difference in pressure acting on it which results from the external pressure of the external air present in the area of the valve holding device 32 and the internal pressure within the suction channel 26 . External air can then flow into the suction channel 26 abruptly through the opening in the valve holding device 32 .
- the filter 24 is, therefore, acted upon in an impact-like manner with external air on its side facing away from the dirt collection tank 12 . This leads to a mechanical jarring of the filter 24 .
- the filter 24 has external air flowing through it in a counterflow direction. This results, altogether, in an effective cleaning of the filter 24 .
- the valve plate 34 lifting away from the valve seat abuts on the stop spring 43 , which acts on the valve plate 34 with a repulsion force in the direction towards the valve holding device 32 , with its underside after a short lifting movement.
- the stop spring 43 absorbs the movement energy of the valve plate 34 .
- the latter is accelerated by the stop spring 43 in the direction towards the valve seat. If the valve plate 34 approaches the valve seat, the stop spring 43 releases the valve plate 34 .
- the latter is returned as far as the valve seat by the closing spring 36 so that the iron plate 58 again comes to rest on the end side of the electromagnet 50 , wherein a gap of air of approximately 0.5 mm is formed, however, between the end side of the electromagnet 50 and the iron plate 58 .
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- Engineering & Computer Science (AREA)
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- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to a vacuum cleaner with a dirt collection tank which has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one extraction line, and with at least one external air inlet which opens into the extraction line downstream of the at least one filter and can be closed by means of at least one closing valve, wherein the at least one closing valve has a valve member which can be moved back and forth between a closing position and an open position, wherein it is acted upon permanently by a closing spring with a closing force and in the closing position, in addition, by a magnetic holding device with a magnetic holding force. In order to develop the vacuum cleaner further in such a manner that it makes a particularly effective cleaning of the at least one filter possible, it is suggested in accordance with the invention that the magnetic holding device comprise an electromagnet with a magnetic core and a coil which can be acted upon with current for the purpose of closing the closing valve, wherein at least one electrical component, which takes up at least some of the energy stored in the coil when the current acting on the coil ceases, is connected in parallel to the coil.
Description
- This application is a continuation of International application No. PCT/EP2006/007541 filed on Jul. 29, 2006.
- The present disclosure relates to the subject matter disclosed in International application No. PCT/EP2006/007541 of Jul. 29, 2006, which is incorporated herein by reference in its entirety and for all purposes.
- The invention relates to a vacuum cleaner with a dirt collection tank which has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one extraction line, and with at least one external air inlet which opens into the extraction line downstream of the at least one filter and can be closed by means of at least one closing valve, wherein the at least one closing valve has a valve member which can be moved back and forth between a closing position, in which it abuts on a valve seat, and an open position, in which it is spaced from the valve seat, wherein it is acted upon permanently by a closing spring with a closing force and in the closing position, in addition, by a magnetic holding device with a magnetic holding force.
- Dirt and, preferably, also liquid can be sucked up from a surface by means of such vacuum cleaners in that the dirt collection tank is acted upon with a vacuum with the aid of at least one suction unit so that a suction flow is formed and dirt and liquid can be sucked into the dirt collection tank. The vacuum cleaners have one or more filters which are arranged in the flow path between the dirt collection tank and the at least one suction unit and serve to separate solids from the suction flow. During suction operation, dirt particles are increasingly deposited on the side of the at least one filter facing the dirt collection tank and so the filter or filters need to be cleaned after a certain length of time. For the purpose of cleaning, the side of the filter facing away from the dirt collection tank can be acted upon with external air in that at least one closing valve is opened so that external air can flow into the at least one extraction line from the external air inlet and act upon the side of the at least one filter facing away from the dirt collection tank.
- In the German Utility Model DE 298 411 U1, it is suggested for the purpose of cleaning a filter that a suction hose, which is connected to the suction inlet of the dirt collection tank, be closed for a short time so that a strong vacuum is formed in the dirt collection tank on account of the action of the suction unit and, subsequently, a closing valve is intended to be opened for a short time. The filter then has external air flowing through it in a counterflow direction, i.e., contrary to the direction of the suction flow prevailing during normal suction operation and so dirt particles adhering to the filter become detached.
- The use of two filters, which are cleaned alternatingly, is suggested in DE 199 49 095 A1, wherein, during the cleaning of one filter, suction operation can be maintained via the other filter to a limited extent.
- The object of the present invention is to develop a vacuum cleaner of the generic type further in such a manner that it makes a particularly effective cleaning of the at least one filter possible.
- This object is accomplished in accordance with the invention, in a vacuum cleaner of the type specified at the outset, in that the magnetic holding device comprises an electromagnet with a magnetic core and a coil which can be acted upon with current for the purpose of closing the closing valve, wherein at least one electrical component, which takes up at least some of the energy stored in the coil when the current acting on the coil ceases, is connected in parallel to the coil.
- In the case of the vacuum cleaner according to the invention, at least one closing valve is used, the valve member of which can be moved back and forth between a closing position and an open position. Irrespective of its position, the valve member is acted upon by a closing spring with a closing force in the direction of its closing position. In the closing position, the closing member is acted upon, in addition, by a magnetic holding force, with the aid of which it is ensured that the closed closing valve reliably closes the flow connection between the inlet for external air and the side of the filter facing away from the dirt collection tank. In this position, the normal suction operation of the vacuum cleaner takes place. If the at least one filter is intended to be cleaned, at least one closing valve is opened. In accordance with the invention, the closing valve has an electromagnet which can be acted upon with current for the purpose of closing the closing valve. For the purpose of opening the closing valve, the supply of current to the electromagnet is interrupted for a short time so that the holding force acting on the valve member ceases abruptly. During normal suction operation, the valve member is subject to a difference in pressure since the pressure of the external air, i.e., normally atmospheric pressure prevails on its side facing away from the filter whereas the vacuum of the extraction line is present at its side facing the filter. When the magnetic holding force ceases, this difference in pressure results in the valve member transferring into its open position contrary to the spring force of the closing valve. With increasing distance from the valve seat, which is associated with the valve member, the restoring force of the closing spring increases and so the valve member is returned to its closing position again by the closing spring. The opening of the closing valve results in the side of the filter, which faces away from the dirt collection tank, being acted upon with external air for a short time. This leads, on the one hand, to a pressure surge which mechanically jars the at least one filter; on the other hand, the at least one filter has external air flowing through it in a counterflow direction.
- In order to bring about as abrupt an action on the filter with external air as possible, it is provided in accordance with the invention for the magnetic holding force to cease after as short a time as possible. For this reason, at least one electrical component, which takes up at least some of the energy stored in the coil when the current acting on the coil ceases, is connected in parallel to the coil. The coil forms a large inductivity for the electrical control circuit of the coil. When the supply of current is interrupted, the inductivity results in a high countervoltage on account of self-inductance. This countervoltage is short-circuited via the at least one electrical component connected in parallel to the coil, wherein this component takes up at least some of the energy stored in the coil. This makes it possible to return the magnetic field of the electromagnet, which prevails during normal suction operation, practically to zero within a very short period of time, preferably within less than 20 milliseconds, in particular, within a period of time of less than 10 milliseconds. The energy of the magnetic field will be taken up by the at least one electrical component connected in parallel to the coil when the supply of current to the coil is interrupted.
- The use according to the invention of at least one electrical component which is connected in parallel to the coil and takes up at least some of the energy stored in the coil makes it possible for the magnetic holding force to drop practically to zero within a very short period of time. Subsequently, the electromagnet can again be acted upon with current so that the valve member, which has been returned to its closing position again by the closing spring, can be held sealingly on the valve seat by means of the renewed magnetic holding force.
- The use according to the invention of at least one electrical component which is connected in parallel to the coil and takes up at least some of the energy stored in the coil when the supply of current to the coil is switched off therefore makes a very short opening of the closing valve possible. External air can, therefore, be supplied in an impact-like manner to the filter to be cleaned and can then also be discharged again immediately by the suction unit which is constantly in flow connection with the filter. The filter cleaning process is, therefore, carried out in fractions of a second. This has the advantage that there is no complete equalization of pressure between the vacuum prevailing in the dirt collection tank and the atmospheric pressure during the cleaning of the filter. On the contrary, a vacuum can also be maintained in the opening area of a suction hose connected to the suction inlet during the cleaning of the filter and so a more or less continuous suction operation results for the user despite the cleaning of the filter.
- It is favorable when a freewheeling diode and at least one electrical component, which takes up energy and is connected in series thereto, are connected in parallel to the coil. The freewheeling diode ensures that an induced countervoltage at the coil is short-circuited. The freewheeling diode does, however, absorb only very little of the energy originally stored in the magnetic field of the electromagnet when the coil is short-circuited. Therefore, at least one electrical component which takes up energy is connected in series to the freewheeling diode. In this respect, an ohmic resistor may be used, for example, or also a transzorb diode. At least some of the induced countervoltage is passed to the electrical component taking up energy when the current acting on the coil ceases. Therefore, the magnetic field of the electromagnet which prevails during normal suction operation can be broken down within a very short period of time.
- In one preferred configuration, a freewheeling diode and a Zener diode, which is polarized in the opposite direction to the freewheeling diode and is connected in series to it, are connected in parallel to the coil. As already explained, an induced countervoltage can be short-circuited via the freewheeling diode. Since this absorbs only a little of the energy originally stored in the coil, a Zener diode, which is polarized in the opposite direction, is connected in series to the coil. The Zener diode is, therefore, connected in a reverse direction with respect to the countervoltage of the coil generated by way of self-inductance and so a not inconsiderable voltage drops away at the Zener diode when the supply of current to the coil is switched off. The magnetic field of the electromagnet, which prevails during normal suction operation, can be returned practically to zero in a particularly short period of time by means of the Zener diode. As a result, the magnetic holding force, which keeps the valve member in its closing position when current acts on the coil, breaks down within a very short period of time and the valve member can lift away from the associated valve seat.
- The Zener diode preferably has a breakdown voltage of more than 50 V. This has the advantage that the induction current of the coil can be returned practically to zero within a very short period of time by means of the Zener diode. The breakdown voltage of the Zener diode can, for example, be approximately 56 V.
- The coil and the at least one component connected in parallel to the coil, i.e., for example, the freewheeling diode and the Zener diode polarized in the opposite direction to it, can preferably be connected to a source of AC voltage via an electrical switching unit and a rectifier unit. The electrical switching unit makes it possible to carry out the cleaning of the filter as a function of the drop in pressure at the filter and/or dependent on time. For example, it may be provided for a pressure sensor to be arranged both upstream and downstream of the filter and for the supply of current to the coil to be interrupted for a short time as a function of the pressures detected by the sensors in order to carry out cleaning of the filter. Alternatively, cleaning of the filter may be carried out at preferably uniform time intervals.
- The electromagnet normally has an iron core, onto which the coil is wound. During normal suction operation, it may be possible for the iron core to be statically charged on account of dirt particles flowing past. The static charge can assume values which represent a hazard, in particular, for the electrical switching unit connected to the coil. As a result, the control of the electromagnet may be impaired. In one preferred configuration of the vacuum cleaner according to the invention, the iron core is, therefore, connected via a potential equalization line to a reference potential predetermined externally.
- The reference potential can be earth potential or also an external DC or AC voltage potential. The potential of the iron core can be balanced with the external reference potential via the potential equalization line. As a result, a static charging of the iron core, which impairs the control of the electromagnet, is avoided. In particular, a very short-time interruption of the supply of current to the electromagnet can be impaired by a static charging of the iron core.
- It is favorable when the potential equalization line connects the iron core to a mains voltage supply connection, wherein at least one ohmic resistor is connected into the potential equalization line. The ohmic resistor preferably has resistance values of at least 10 MΩ, in particular, resistance values of approximately 15 to 25 MΩ.
- It is of particular advantage when at least two ohmic resistors with different resistance values are connected into the potential equalization line in series to one another. As a result, a first ohmic resistor can, for example, have a resistance value of approximately 8 MΩ and a second ohmic resistor can have a resistance value of approximately 12 MΩ. The use of different ohmic resistors has the advantage that during assembly of the vacuum cleaner the risk is reduced of two low-impedance resistors being used by mistake. The electrical safety of the vacuum cleaner is improved as a result.
- The movable valve member is held reliably in its closing position with the aid of the electromagnet used in accordance with the invention. In order to open the closing valve, the supply of current to the electromagnet is interrupted for a short time. It is of advantage when the electromagnet is arranged on a valve holding device which forms the valve seat and when the valve member has a magnetizable element which is associated with the electromagnet and forms a magnetic circuit with the electromagnet in the closing position of the valve member. The magnetizable element, for example, an iron-bearing plate bundles the field lines of the electromagnet in the valve member so that it is kept reliably in its closing position due to the action of the magnetic holding force. If the valve member is, however, at a relatively slight distance of, for example, two millimeters from the valve seat, the magnetic circuit is interrupted since the magnetizable element is also at a corresponding distance in relation to the electromagnet. As a result, the holding force exerted by the electromagnet has only a very short range. During an opening movement, the valve member thus experiences a magnetic holding force only in the immediate area of the valve seat; the magnetic force is already so slight at a distance of approximately 2 mm between the electromagnet and the magnetizable element that it cannot return the valve member to its closing position. On the contrary, the closing spring is used to return the valve member.
- As already explained, it can be ensured by means of the at least one component which is connected in parallel to the coil and takes up at least some of the energy stored in the coil that the magnetic holding force ceases within a very short period of time, for example, within ten milliseconds when the supply of current to the electromagnet is interrupted. As a result, a short-time opening movement of the valve member can be achieved which is held in its closing position preferably with the aid of the magnetizable element on the electromagnet. It is of advantage when, in the closing position of the valve member, the magnetizable element abuts on the end side of the electromagnet, thereby forming a gap of air. It has been shown that the influence of a residual magnetization of the magnetizable element on the opening movement of the valve member can be kept particularly small by making a gap of air available between the magnetizable element and the electromagnet. Such a residual magnetization would result in the valve member still being held, first of all, on the electromagnet on account of the magnetization of the magnetizable element which has taken place, despite a drop in the magnetic holding force of the coil. Such a residual magnetization can be counteracted, for example, by a special alloy of the magnetizable element. This does, however, entail not inconsiderable costs. Instead of using such an alloy, a gap of air between the magnetizable element and the electromagnet is provided in accordance with the invention. It has been shown that a very short-time opening movement of the valve member can be achieved due to such a gap of air being made available.
- The gap of air is preferably narrower than 1 mm. It can, for example, be less than 0.7 mm, in particular, approximately 0.5 mm.
- A particularly effective cleaning of the filter is achieved in one preferred configuration of the vacuum cleaner according to the invention in that the supply of current to the coil can be interrupted several times one after the other for a period of time of at the most 0.2 seconds at time intervals of less than 1 second. It may, for example, be provided for the supply of current to be interrupted two, three or even four times one after the other for approximately 100 milliseconds each at time intervals of approximately 0.5 seconds. The multiple, short-time interruption in the current results in the valve member performing a rapid opening and closing movement several times one after the other so that the at least one filter to be cleaned is acted upon with a pressure surge several times at short time intervals and has external air flowing through it. This results in an alternating mechanical load on the at least one filter, under the influence of which the filter or filters are cleaned effectively.
- The supply of current to the coil can preferably be interrupted several times one after the other for less than 0.2 seconds at time intervals of approximately 10 to approximately 30 seconds. It may be provided, for example, for the supply of current to the coil to be interrupted for a short time at uniform time intervals of, for example, 15 seconds. The current can, in particular, be interrupted three times one after the other for approximately 0.1 seconds at intervals of 0.5 seconds each.
- In one advantageous configuration, a flexible stop element is associated with the valve member and this acts on the valve member with a repulsion force in a position spaced in relation to the valve seat. A very short opening movement of the valve member can be achieved in a constructionally simple manner as a result of the flexible stop element, wherein the valve member is acted upon first of all only with the closing force of the closing spring, proceeding from its closing position. Only when the valve member has a certain distance in relation to the valve seat, will the flexible stop element become effective and act on the valve member with a repulsion force. The flexible stop element absorbs the movement energy of the valve member and accelerates it back in the direction of the valve seat. With the aid of the flexible stop element, the closing valve can be closed again within a very short period of time, in particular, after a period of time of less than 0.2 seconds. The normal suction operation of the vacuum cleaner can, as it were, be carried on continuously and, nevertheless, an effective cleaning of the filter can be achieved. External air enters the dirt collection tank only for a very short period of time and so the suction flow in the area of the suction inlet of the dirt collection tank is not noticeably interrupted. The vacuum cleaner is, consequently, characterized by a constructively simple construction, wherein all the filters present can have suction air flowing through them at the same time during suction operation and wherein the entire side of the at least one filter which faces away from the dirt collection tank can be acted upon with external air due to a short-time opening of the at least one closing valve. The external air is supplied to the filter in an impact-like manner, wherein the at least one suction unit is permanently in flow connection with the filter, i.e., also during the time of its cleaning.
- The flexible stop element can be designed in different forms. It is preferably designed as a stop spring. This has a greater spring constant than the closing spring in one preferred configuration. The stop spring is, therefore, harder than the closing spring, i.e., a greater force is necessary to compress the stop spring than is the case for the closing spring. The stop spring can, like the closing spring, have a linear or also a non-linear characteristic. For example, it may be provided for the stop spring and/or the closing spring to become harder with increasing travel of the spring.
- In one preferred configuration of the vacuum cleaner according to the invention, the closing spring and the stop spring are designed as helical springs with different diameters, wherein one of the two helical springs surrounds the other helical spring in circumferential direction. This makes a space-saving arrangement of the closing spring and the stop spring possible and, in addition, makes a simple assembly possible.
- The closing spring preferably surrounds the stop spring in circumferential direction. This has the advantage that the valve member abuts on the closing spring at a relatively large contact surface and is guided back into the closing position by the closing spring. The tilting stability of the valve member is improved as a result.
- The combined use of an electromagnet, in the freewheeling circuit of which at least one component taking up energy, for example, a freewheeling diode and a Zener diode, which is polarized in the opposite direction thereto, are connected in series to one another, with a closing spring which acts on the valve member permanently with a closing force and with a flexible stop element is of particular advantage since, as a result, the valve member can be reliably held in a sealing manner on the valve seat in its closing position and as a result of a very short-time interruption in the current the valve member can lift away from the valve seat for a period of time of less than 0.2 seconds on account of the difference in pressure acting on it and so the closing valve is opened. At a distance from the valve seat, the valve member meets the flexible stop element which acts on the valve member with a repulsion force in the direction towards the valve seat. As a result of the action of the repulsion force and the closing force exerted by the closing spring, the valve member again reaches the valve seat within a very short period of time. The closing spring has, in this respect, the function of returning the valve member to the area of the magnetic field of the electromagnet so that the valve member can be held on the valve seat during normal suction operation by the electromagnet which is again acted upon with current.
- The vacuum cleaner can have several filters. It has proven to be particularly advantageous when the vacuum cleaner comprises a single filter. It may, in particular, be provided for the filter to be acted upon with external air over its entire surface area as a result of simultaneous opening of all the closing valves.
- In a constructionally particularly simple configuration of the vacuum cleaner according to the invention, this merely has a single closing valve which is positioned on the side of a filter holding device with flow passages which faces away from the single filter. As a result of the closing valve being opened, the single filter is acted upon with external air over its entire surface area.
- The configuration of the vacuum cleaner according to the invention makes it possible for external air to act on the side of the at least one filter, which faces away from the dirt collection tank, for a short time during normal suction operation and for this air to be removed by suction within a short time by means of the suction unit which is in flow connection with the filter even when the closing valve is opened. It is favorable when the valve member carries out a continuous movement back into its closing position via its open position, proceeding from its closing position, during the cleaning of the filter. With such a configuration, the valve member will, first of all, be accelerated powerfully in the direction away from the valve seat when the closing valve is opened and, subsequently, braked powerfully with the aid of the closing spring and, preferably, with the aid of the flexible stop element and reversed in its direction of movement in order to be accelerated again in the direction towards the valve seat. The entire movement of the valve member proceeding from its closing position via the open position back into the closing position can take place in fractions of a second, in particular, in a period of time of less than 200 milliseconds.
- The at least one filter can preferably be acted upon with external air by means of the at least one closing valve whilst a vacuum is maintained in the opening area of a suction hose opening into the suction inlet. If the at least one closing valve is opened, the pressure on the side of the filter facing away from the dirt collection tank rises abruptly and is then reduced again. The abrupt rise in pressure causes an effective cleaning of the filter; since the rise in pressure does, however, drop again immediately due to the at least one suction unit, it does not lead to a complete interruption in the vacuum in the opening area of the suction hose opening into the suction inlet. On the contrary, a more or less continuous suction operation can be maintained.
- The following description of one preferred embodiment of the invention serves to explain the invention in greater detail in conjunction with the drawings.
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FIG. 1 : shows a schematic sectional view of a vacuum cleaner according to the invention; -
FIG. 2 : shows an enlarged illustration of detail A fromFIG. 1 and -
FIG. 3 : shows a block diagram of a supply circuit for an electromagnet of the vacuum cleaner. - In the drawings, a
vacuum cleaner 10 is illustrated schematically with a lower part which forms adirt collection tank 12 and with anupper part 14 which is placed on the lower part and accommodates asuction unit 16. Thedirt collection tank 12 comprises asuction inlet 18, to which asuction hose 20 can be connected. A suction nozzle can be connected to the free end of thesuction hose 20 which is not illustrated in the drawings in order to achieve a better overview. Alternatively, it may be provided for thesuction hose 20 to be connected to a machining tool, for example, a drilling unit or a milling unit so that dust which occurs during operation of the machining tool can be sucked in. - The
upper part 14 forms asuction outlet 22 for thedirt collection tank 12. A foldedfilter 24 is held on thesuction outlet 22 and an extraction line in the form of asuction channel 26 is connected to the filter. The foldedfilter 24 is permanently in flow connection with thesuction unit 16 via thesuction channel 26. Thedirt collection tank 12 can be acted upon with a vacuum by thesuction unit 16 via thesuction channel 26 and the foldedfilter 24 and so a suction flow symbolized inFIG. 1 by thearrows 28 is formed, due to the action of which dirt can be sucked into thedirt collection tank 12. The dirt particles can be separated from thesuction flow 28 by means of the foldedfilter 24. - A closing
valve 30 is arranged in theupper part 14 above the foldedfilter 24 and is illustrated inFIG. 2 on an enlarged scale. It comprises avalve holding device 32 which is arranged stationarily in theupper part 14, forms a valve seat and interacts with a valve member in the form of acircular valve plate 34. Thevalve plate 34 is acted upon with a closing force in the direction towards thevalve holding device 32 by means of aclosing spring 36. The closingspring 36 has a linear characteristic and is clamped between thevalve plate 34 and a plate-likefilter holding device 38 which has a plurality of flow passages and is arranged stationarily in theupper part 14. Thefilter holding device 38 has an outerannular collar 40, which surrounds the adjacent end area of theclosing spring 36 designed as a helical spring in circumferential direction, on its upper side facing the closingvalve 30. Thevalve plate 34 has anannular bead 41, on which theclosing spring 36 abuts on the outer side, on its underside facing thefilter holding device 38. - In addition to the
closing spring 36, thefilter holding device 38 has a flexible stop element in the form of astop spring 43 which, like theclosing spring 36, is designed as a helical spring and has a linear characteristic. In order to hold thestop spring 43, thefilter holding device 38 comprises on its upper side facing the closingvalve 30 an innerannular collar 44 which is arranged concentrically to theouter collar 40 and in which thestop spring 43 engages with an end section. A guidingpin 46 is integrally formed on thevalve plate 34 on the under side, aligned with the innerannular collar 44, this guiding pin being surrounded by an end area of thestop spring 43 in the closing position of thevalve plate 34 illustrated inFIG. 2 . Thestop spring 43 is not subject to tensioning in the closing position of the valve plate, in contrast to the closing spring. Only when thevalve plate 34 has lifted away from the valve seat of thevalve holding device 32 will thestop spring 43 come to rest on the underside of thevalve plate 34 and will be compressed somewhat during further movement of thevalve plate 34. - The
valve holding device 32 has a plurality of openings which are not illustrated in the drawings and which open into the valve seat, on which thevalve plate 34 sealingly abuts when it takes up its closing position. At the level of thevalve holding device 32, theupper part 14 has alateral opening 48. External air can flow into the openings in thevalve holding device 32 via thelateral opening 48. If thevalve plate 34 takes up a position which is spaced in relation to thevalve holding device 32 and, therefore, also in relation to the valve seat, thelateral opening 48 is in flow connection with thesuction channel 26 via the openings in thevalve holding device 32 and external air can act on the side of thefilter 24 facing away from thedirt collection tank 12. If thevalve plate 34 takes up its closing position, the flow connection between thesuction channel 26 and thelateral opening 48 is interrupted. - In a central area, the
valve holding device 32 has a magnetic holding device in the form of anelectromagnet 50 with amagnetic core 51 which is surrounded by amagnetic coil 52. The end of theelectromagnet 50 on the outer side is formed by acylindrical casing 53 which, like themagnetic core 51, is produced from a magnetizable material. Thecasing 53 is surrounded in the circumferential direction by a guiding receptacle in the form of anannular space 55, in which a guidingsleeve 56 engages which is integrally formed on thevalve plate 34 on the upper side. Theannular space 55 and the guidingsleeve 56 form guiding elements for the displaceable mounting of thevalve plate 34. The guidingsleeve 56 accommodates a magnetizable element in the form of aniron plate 58 which abuts on the free end side of theelectromagnet 50 in the closing position of thevalve plate 34 and forms a closed magnetic circuit in combination with themagnetic core 51 and thecasing 53. The closed magnetic circuit bundles the magnetic field lines of theelectromagnet 50. - The supply of current to the
electromagnet 50 is illustrated schematically inFIG. 3 . Themagnetic coil 52 is in electrical connection with arectifier unit 65 via a firstcurrent supply line 61 and a secondcurrent supply line 62, the rectifier unit being connected tomains connections first connection line 67 and asecond connection line 68. A source of AC voltage can be connected in a customary manner to the mains connections. - An electrically
controllable switching unit 74 is connected into the firstcurrent supply line 61; the supply of current to themagnetic coil 52 can be interrupted with the aid of this switching unit as a function of a control signal which is made available by a control unit of thevacuum cleaner 10, which is not illustrated in the drawings, via acontrol connection 75 of the switchingunit 74. A freewheelingdiode 79 and aZener diode 80 connected in series to one another are connected in parallel to themagnetic coil 52 in a free-runningline 77, wherein theZener diode 80 is polarized in the opposite direction to the freewheelingdiode 79. - The
magnetic core 51 and thecasing 53 of theelectromagnet 50 form a housing of theelectromagnet 50 which is given thereference numeral 82 inFIG. 3 . It is produced from an electrically conductive material, in particular, from an iron material and is in electrical connection with thefirst connection line 67 via apotential equalization line 84. A firstohmic resistor 86 and a secondohmic resistor 87 are connected into thepotential equalization line 84 in series to one another. The resistance value of the first ohmic resistor is, for example, approximately 8 MΩ whereas the resistance value of the second ohmic resistor can, for example, be 12 MΩ. - The
magnetic coil 52 can be acted upon with current via therectifier unit 65 and the switchingunit 74 for the purpose of forming a magnetic holding force which keeps thevalve plate 34 in its closing position. The supply of current can be interrupted for a short period of time by means of the switchingunit 74, for example, for a period of time of approximately 100 milliseconds. As a result, an induction voltage which is directed opposite to the original voltage is formed at themagnetic coil 52 as a result of self-inductance. This induction voltage will be short-circuited via the freewheelingdiode 79 and theZener diode 80 so that the associated induction current of themagnetic coil 52 drops away practically completely within a very short time, for example, within approximately 10 milliseconds after the supply of current has been switched off, i.e., within approximately 10 milliseconds the magnetic field of theelectromagnet 50 which prevails during normal suction operation breaks down completely. TheZener diode 80 is polarized in the opposite direction to the freewheelingdiode 79 and is, therefore, operated in a reverse direction so that the breakdown voltage, which is approximately 56 V in the embodiment illustrated, drops away at the Zener diode. As a result, a considerable amount of energy-can be removed from themagnetic coil 52 within a very short period of time and so the induced current drops away practically completely within the specified period of time of approximately 10 milliseconds. - If the user switches the
vacuum cleaner 10 on, thesuction unit 16 is started and, at the same time, themagnetic coil 52 is supplied with current via theswitching unit 74 and therectifier unit 65 so that thevalve plate 34 is acted upon by theelectromagnet 50 with a magnetic holding force which keeps it reliably in its closing position. Thesuction unit 16 acts on thedirt collection tank 12 and thesuction channel 26 with a vacuum so that dirt particles, like drops of liquid, can be sucked into thedirt collection tank 12. Dirt particles are deposited at thefilter 24 and so this gradually becomes clogged during normal suction operation. The supply of current to themagnetic coil 52 is therefore interrupted by means of the switchingunit 74 several times for a short period of time at time intervals of, for example, 10 to 30 seconds, in particular, at time intervals of approximately 15 seconds. It may, for example, be provided for the supply of current to themagnetic coil 52 to be interrupted three times one after the other for approximately 0.1 seconds at intervals of 0.5 seconds each and for the normal suction operation to then be restarted for 15 seconds. The interruption in the supply of current results in the magnetic field of the electromagnet breaking down within a very short time, for example, within approximately 10 milliseconds on account of the use of theZener diode 80 and, therefore, the magnetic holding force for thevalve plate 34 ceases. On the other hand, this causes thevalve plate 34 to lift away from the valve seat contrary to the action of theclosing spring 36 on account of the difference in pressure acting on it which results from the external pressure of the external air present in the area of thevalve holding device 32 and the internal pressure within thesuction channel 26. External air can then flow into thesuction channel 26 abruptly through the opening in thevalve holding device 32. Thefilter 24 is, therefore, acted upon in an impact-like manner with external air on its side facing away from thedirt collection tank 12. This leads to a mechanical jarring of thefilter 24. In addition, thefilter 24 has external air flowing through it in a counterflow direction. This results, altogether, in an effective cleaning of thefilter 24. - The
valve plate 34 lifting away from the valve seat abuts on thestop spring 43, which acts on thevalve plate 34 with a repulsion force in the direction towards thevalve holding device 32, with its underside after a short lifting movement. Thestop spring 43 absorbs the movement energy of thevalve plate 34. The latter is accelerated by thestop spring 43 in the direction towards the valve seat. If thevalve plate 34 approaches the valve seat, thestop spring 43 releases thevalve plate 34. The latter is returned as far as the valve seat by the closingspring 36 so that theiron plate 58 again comes to rest on the end side of theelectromagnet 50, wherein a gap of air of approximately 0.5 mm is formed, however, between the end side of theelectromagnet 50 and theiron plate 58. If theiron plate 58 reaches the end side of theelectromagnet 50, this is again acted upon with current via theswitching unit 74 so that thevalve plate 34 is again held sealingly on the valve seat by theelectromagnet 50. The interruption in the supply of current for theelectromagnet 50 takes place merely for a period of time of approximately 100 milliseconds so that the closingvalve 40 opens only for a very short period of time and external air can reach thefilter 24. Subsequently, theelectromagnet 50 is again acted upon with current and the normal suction operation can be continued. On account of the short opening of the closingvalve 30, a vacuum is also maintained during the cleaning of the filter in the opening area of thesuction hose 20 opening into thesuction inlet 18. As a result, a more or less continuous suction operation is possible for the user and, nevertheless, a reliable cleaning of the filter is guaranteed.
Claims (21)
1. Vacuum cleaner with a dirt collection tank having a suction inlet and being in flow connection with at least one suction unit via at least one filter and at least one extraction line, and with at least one external air inlet opening into the extraction line downstream of the at least one filter, said external air inlet being closable by means of at least one closing valve, wherein the at least one closing valve has a valve member movable back and forth between a closing position, said valve member abutting on a valve seat in said closing position, and an open position, said valve member being spaced from the valve seat in said open position, wherein said valve member is acted upon permanently by a closing spring with a closing force and in the closing position, in addition, by a magnetic holding device with a magnetic holding force, wherein the magnetic holding device comprises an electromagnet with a magnetic core and a coil adapted to be acted upon with current for the purpose of closing the closing valve, wherein at least one electrical component is connected in parallel to the coil, said component taking up at least some of the energy stored in the coil when the current acting on the coil ceases.
2. Vacuum cleaner as defined in claim 1 , wherein a freewheeling diode and at least one electrical component taking up energy and being connected in series thereto are connected in parallel to the coil.
3. Vacuum cleaner as defined in claim 1 , wherein a freewheeling diode and a Zener diode connected in-series thereto are connected in parallel to the coil, said Zener diode being polarized in an opposite direction to the freewheeling diode.
4. Vacuum cleaner as defined in claim 3 , wherein the Zener diode has a breakdown voltage of approximately 50 V.
5. Vacuum cleaner as defined in claim 1 , wherein the coil and the at least one component connected in parallel to the coil are adapted to be connected to a source of AC voltage via an electrical switching unit and a rectifier unit.
6. Vacuum cleaner as defined in claim 1 , wherein the magnetic core is connected via a potential equalization line to a reference potential predetermined externally.
7. Vacuum cleaner as defined in claim 6 , wherein the potential equalization line connects the magnetic core to a mains voltage supply connection, wherein at least one ohmic resistor is connected into the potential equalization line.
8. Vacuum cleaner as defined in claim 7 , wherein two ohmic resistors with different resistance values are connected into the potential equalization line in series to one another.
9. Vacuum cleaner as defined in claim 1 , wherein the electromagnet is arranged on a valve holding device forming the valve seat and wherein the valve member has a magnetizable element associated with the electromagnet, said element forming a magnetic circuit with the electromagnet in the closing position of the valve member.
10. Vacuum cleaner as defined in claim 9 , wherein in the closing position of the valve member the magnetizable element abuts on the end side of the electromagnet, thereby forming a gap of air.
11. Vacuum cleaner as defined in claim 10 , wherein the gap of air is narrower than 1 mm.
12. Vacuum cleaner as defined in claim 1 , wherein the supply of current to the coil is adapted to be interrupted several times one after the other for a period of time of at the most 0.2 seconds at time intervals of less than one second.
13. Vacuum cleaner as defined in claim 1 , wherein the supply of current to the coil is adapted to be interrupted several times one after the other for less than 0.2 seconds at time intervals of 10 to 30 seconds.
14. Vacuum cleaner as defined in claim 1 , wherein a flexible stop element is associated with the valve member, said stop element acting on the valve member with a repulsion force in a position spaced from the valve seat.
15. Vacuum cleaner as defined in claim 14 , wherein the flexible stop element is designed as a stop spring.
16. Vacuum cleaner as defined in claim 15 , wherein the spring constant of the stop spring is greater than the spring constant of the closing spring.
17. Vacuum cleaner as defined in claim 15 , wherein the closing spring and the stop spring are designed as helical springs with different diameters, wherein one of the two helical springs surrounds the other helical spring in circumferential direction.
18. Vacuum cleaner as defined in claim 1 , wherein the vacuum cleaner has a single filter.
19. Vacuum cleaner as defined in claim 18 , wherein the filter is adapted to be acted upon with external air over its entire surface area as a result of the closing valve being opened.
20. Vacuum cleaner as defined in claim 1 , wherein the valve member is movable continuously back into its closing position via its open position, proceeding from its closing position.
21. Vacuum cleaner as defined in claim 1 , wherein the at least one filter is adapted to be acted upon with external air by means of the at least one closing valve whilst a vacuum is maintained in the opening area of a suction hose opening into the suction inlet.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2006/007541 WO2008014794A1 (en) | 2006-07-29 | 2006-07-29 | Vacuum cleaner with self-cleaning filter device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/007541 Continuation WO2008014794A1 (en) | 2006-07-29 | 2006-07-29 | Vacuum cleaner with self-cleaning filter device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090205159A1 true US20090205159A1 (en) | 2009-08-20 |
Family
ID=37847089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/322,072 Abandoned US20090205159A1 (en) | 2006-07-29 | 2009-01-27 | Vacuum cleaner |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090205159A1 (en) |
EP (1) | EP2049001B1 (en) |
DK (1) | DK2049001T3 (en) |
PL (1) | PL2049001T3 (en) |
WO (1) | WO2008014794A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080086835A1 (en) * | 2005-04-11 | 2008-04-17 | Alfred Kaercher Gmbh & Co. Kg | Vacuum cleaning device |
US20080092498A1 (en) * | 2005-04-11 | 2008-04-24 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum Cleaner and vacuum cleaner for carrying out said method |
US20090205491A1 (en) * | 2006-07-29 | 2009-08-20 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum cleaner and vacuum cleaner for carrying out the method |
US20090205499A1 (en) * | 2006-07-29 | 2009-08-20 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum cleaner and vacuum cleaner for carrying out the method |
US8393048B2 (en) | 2009-04-22 | 2013-03-12 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning two filters of a suction device for cleaning purposes and suction device for performing the method |
CN103177688A (en) * | 2013-02-04 | 2013-06-26 | 上海交通大学 | Method for dynamically regulating power supply voltage on basis of one-dimension partitioning strategy of AMOLED (active-matrix organic light-emitting diode) panel |
US8474093B2 (en) | 2009-07-07 | 2013-07-02 | Alfred Kaercher Gmbh & Co. Kg | Suction appliance for cleaning purposes |
US8510904B2 (en) | 2009-04-30 | 2013-08-20 | Alfred Kaercher Gmbh & Co. Kg | Suction cleaning apparatus |
US9271620B2 (en) | 2012-03-27 | 2016-03-01 | Daryl S. Meredith | Vacuum |
US10376113B2 (en) * | 2015-01-13 | 2019-08-13 | Alfred Kärcher SE & Co. KG | Suction device and method for operating a suction device |
US10426305B2 (en) * | 2015-01-13 | 2019-10-01 | Alfred Kärcher SE & Co. KG | Suction device |
CN112895190A (en) * | 2021-01-18 | 2021-06-04 | 袁小涵 | Automatic kneading machine of constant temperature moisturizing |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL2046182T3 (en) | 2006-07-29 | 2014-10-31 | Kaercher Gmbh & Co Kg Alfred | Vacuum cleaner with a self-cleaning filter apparatus |
DE102016100780A1 (en) | 2016-01-19 | 2017-07-20 | Festool Gmbh | suction device |
Citations (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2591567A (en) * | 1948-05-29 | 1952-04-01 | Electrolux Corp | Vacuum cleaner |
US3325979A (en) * | 1964-03-18 | 1967-06-20 | Fuller Co | Dust collector |
US3363764A (en) * | 1966-06-10 | 1968-01-16 | Brackston T. Whitaker | Automatic flushing sediment separator |
US3396516A (en) * | 1966-08-02 | 1968-08-13 | Menardi & Company | Baghouse apparatus |
US3431709A (en) * | 1967-09-25 | 1969-03-11 | Sanko Seisakusho Kk | Dust collector |
US3498030A (en) * | 1967-11-01 | 1970-03-03 | John L Wilki | Cleaning devices for gas filtering apparatus |
US3509394A (en) * | 1967-01-11 | 1970-04-28 | Gen Electric | Electromagnetic clutch control |
US3536094A (en) * | 1968-03-12 | 1970-10-27 | Flavious E Manley Jr | Compressor valve |
US3731465A (en) * | 1970-01-19 | 1973-05-08 | Hitachi Ltd | Electric vacuum cleaner |
US3748836A (en) * | 1971-06-03 | 1973-07-31 | Teledyne Inc | Filter cleaning system for internal combustion engine |
US3792569A (en) * | 1969-08-22 | 1974-02-19 | Tennant Co | Filter chamber |
US3868237A (en) * | 1972-05-05 | 1975-02-25 | Wolfgang Berz | Dust filter |
US3945390A (en) * | 1973-04-09 | 1976-03-23 | Klinger Ag | Sealing system for shutoff elements |
US3994067A (en) * | 1972-11-14 | 1976-11-30 | Mcculloch Corporation | Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine |
US4033732A (en) * | 1974-05-02 | 1977-07-05 | Aktiebolaget Svenska Flaktfabriken | Method and apparatus for cleaning fabric filters of bag type or the like |
US4124916A (en) * | 1977-08-04 | 1978-11-14 | The Singer Company | Vacuum cleaner condition indicator and safety device |
US4124915A (en) * | 1977-08-15 | 1978-11-14 | S/V Tool Company, Inc. | Combination scraper and squeegee |
US4171208A (en) * | 1977-10-03 | 1979-10-16 | Clarke-Gravely Corporation | Vacuum cleaner including diverter valve |
US4277265A (en) * | 1978-10-19 | 1981-07-07 | Aktiebolaget Electrolux | Compressing arrangement for a dust container |
US4329161A (en) * | 1981-05-18 | 1982-05-11 | Jack Osborn | Valve system for vacuum cleaner |
USRE31417E (en) * | 1973-04-09 | 1983-10-18 | Klinger Ag | Sealing system for shutoff elements |
US4482129A (en) * | 1982-06-10 | 1984-11-13 | The United States Of America As Represented By The United States Department Of Energy | All metal valve structure for gas systems |
US4581135A (en) * | 1983-08-19 | 1986-04-08 | Henry C. Kova | Self-cleaning fluid filter with a drain |
US4719662A (en) * | 1985-11-16 | 1988-01-19 | W. Schlafhorst & Co. | Dust-removal apparatus for textile machines and machine rooms |
US4733326A (en) * | 1985-05-15 | 1988-03-22 | Robert Bosch Gmbh | Protective arrangement for an electromagnetic load |
US4921510A (en) * | 1984-10-03 | 1990-05-01 | Arnold Plooy | Vacuum cleaner system |
US5002594A (en) * | 1989-08-31 | 1991-03-26 | Ransburg Corporation | Filter pulse-down cartridge cleaning mechanism |
US5178652A (en) * | 1990-09-21 | 1993-01-12 | Huettlin Herbert | Method and apparatus for guiding process gas in a filter |
US5246205A (en) * | 1992-04-06 | 1993-09-21 | Donaldson Company, Inc. | Valve assembly and use |
US5322534A (en) * | 1993-02-11 | 1994-06-21 | Kaiser David M | Self-cleaning upside-down air filter |
US5368060A (en) * | 1992-09-15 | 1994-11-29 | Ab Electrolux | Valves |
US5369839A (en) * | 1992-02-28 | 1994-12-06 | Firma Fedag | Vacuum cleaner |
US5511583A (en) * | 1995-01-24 | 1996-04-30 | Dover Resources, Inc. | Compressor valve |
US5882180A (en) * | 1996-02-01 | 1999-03-16 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Oil mist filter in a variable displacement compressor |
US5951746A (en) * | 1995-11-30 | 1999-09-14 | Alfred Karcher Gmbh & Co. | Suction device for cleaning purposes |
US5975062A (en) * | 1997-03-11 | 1999-11-02 | Pierburg Ag | Apparatus and method for periodically cleaning a charcoal canister and for periodically checking leak-tightness of a fuel system of an internal combustion engine |
US20020066262A1 (en) * | 2000-11-27 | 2002-06-06 | Samsung Kwangju Electronics Co., Ltd. | Cyclone dust collecting device for a vacuum cleaner |
US6406505B1 (en) * | 2000-08-07 | 2002-06-18 | Samsung Kwangju Electronics Co., Ltd. | Vacuum cleaner having a cyclone type dust collecting apparatus |
US20020088078A1 (en) * | 2001-01-10 | 2002-07-11 | Samsung Kwangju Electronics Co., Ltd. | Cyclone dust collecting apparatus for a vacuum cleaner |
US6440191B1 (en) * | 2000-06-14 | 2002-08-27 | Shop Vac Corporation | Vacuum cleaner filter assembly |
US20020124729A1 (en) * | 2001-03-08 | 2002-09-12 | Dudley David Edmond | Self spin-cleaning canister vacuum |
US6458178B1 (en) * | 1999-10-12 | 2002-10-01 | Wap Reinigungssystems Gmbh & Co. | Filter dedusting arrangement in a vacuum cleaner |
US6517325B2 (en) * | 2000-06-30 | 2003-02-11 | Hitachi, Ltd. | Air compressor and method of operating the same |
US20030167590A1 (en) * | 2002-03-05 | 2003-09-11 | Samsung Gwangju Electronics Co., Ltd. | Vacuum cleaner with reusable filter |
US20050011036A1 (en) * | 2003-07-18 | 2005-01-20 | Christy, Inc. | Ambient air backflushed filter vacuum |
US6936161B2 (en) * | 2002-08-21 | 2005-08-30 | Arvin Technologies, Inc. | Fluid filter apparatus |
US20050254270A1 (en) * | 2002-08-02 | 2005-11-17 | Moeller Gmbh | Control circuit for an electromagnetic drive |
US20050251953A1 (en) * | 2002-09-24 | 2005-11-17 | Dayson Technology | Vacuum cleaning head |
US7340797B2 (en) * | 2004-06-25 | 2008-03-11 | The Hoover Company | Recovery tank for a cleaning apparatus |
US20080086835A1 (en) * | 2005-04-11 | 2008-04-17 | Alfred Kaercher Gmbh & Co. Kg | Vacuum cleaning device |
US20080092498A1 (en) * | 2005-04-11 | 2008-04-24 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum Cleaner and vacuum cleaner for carrying out said method |
US20090027823A1 (en) * | 2007-07-23 | 2009-01-29 | Schneider Electric Industries Sas | Electromagnetic actuator with at least two windings |
US20090205491A1 (en) * | 2006-07-29 | 2009-08-20 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum cleaner and vacuum cleaner for carrying out the method |
US20090205499A1 (en) * | 2006-07-29 | 2009-08-20 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum cleaner and vacuum cleaner for carrying out the method |
US20090205158A1 (en) * | 2006-07-29 | 2009-08-20 | Alfred Kaercher Gmbh & Co. Kg | Vacuum cleaner |
US7647672B2 (en) * | 2004-07-16 | 2010-01-19 | Lg Electronics Inc. | Vacuum cleaner |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59507757D1 (en) * | 1995-11-30 | 2000-03-09 | Kaercher Gmbh & Co Alfred | SUCTION UNIT FOR CLEANING PURPOSES |
DE29823411U1 (en) * | 1998-05-08 | 1999-05-20 | Alfred Kärcher GmbH & Co, 71364 Winnenden | Suction device for cleaning purposes |
DE10029225C2 (en) * | 2000-06-14 | 2002-10-24 | Wap Reinigungssysteme | Method and device for filter cleaning for vacuum cleaners by means of pressure surge |
DE10321977A1 (en) * | 2003-05-15 | 2004-12-02 | BSH Bosch und Siemens Hausgeräte GmbH | Vacuum cleaner with a compressed air cleaning device for ceramic filters |
-
2006
- 2006-07-29 DK DK06776506.5T patent/DK2049001T3/en active
- 2006-07-29 WO PCT/EP2006/007541 patent/WO2008014794A1/en active Application Filing
- 2006-07-29 EP EP06776506.5A patent/EP2049001B1/en active Active
- 2006-07-29 PL PL06776506T patent/PL2049001T3/en unknown
-
2009
- 2009-01-27 US US12/322,072 patent/US20090205159A1/en not_active Abandoned
Patent Citations (58)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2591567A (en) * | 1948-05-29 | 1952-04-01 | Electrolux Corp | Vacuum cleaner |
US3325979A (en) * | 1964-03-18 | 1967-06-20 | Fuller Co | Dust collector |
US3363764A (en) * | 1966-06-10 | 1968-01-16 | Brackston T. Whitaker | Automatic flushing sediment separator |
US3396516A (en) * | 1966-08-02 | 1968-08-13 | Menardi & Company | Baghouse apparatus |
US3509394A (en) * | 1967-01-11 | 1970-04-28 | Gen Electric | Electromagnetic clutch control |
US3431709A (en) * | 1967-09-25 | 1969-03-11 | Sanko Seisakusho Kk | Dust collector |
US3498030A (en) * | 1967-11-01 | 1970-03-03 | John L Wilki | Cleaning devices for gas filtering apparatus |
US3536094A (en) * | 1968-03-12 | 1970-10-27 | Flavious E Manley Jr | Compressor valve |
US3792569A (en) * | 1969-08-22 | 1974-02-19 | Tennant Co | Filter chamber |
US3731465A (en) * | 1970-01-19 | 1973-05-08 | Hitachi Ltd | Electric vacuum cleaner |
US3748836A (en) * | 1971-06-03 | 1973-07-31 | Teledyne Inc | Filter cleaning system for internal combustion engine |
US3868237A (en) * | 1972-05-05 | 1975-02-25 | Wolfgang Berz | Dust filter |
US3994067A (en) * | 1972-11-14 | 1976-11-30 | Mcculloch Corporation | Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine |
USRE31417E (en) * | 1973-04-09 | 1983-10-18 | Klinger Ag | Sealing system for shutoff elements |
US3945390A (en) * | 1973-04-09 | 1976-03-23 | Klinger Ag | Sealing system for shutoff elements |
US4033732A (en) * | 1974-05-02 | 1977-07-05 | Aktiebolaget Svenska Flaktfabriken | Method and apparatus for cleaning fabric filters of bag type or the like |
US4124916A (en) * | 1977-08-04 | 1978-11-14 | The Singer Company | Vacuum cleaner condition indicator and safety device |
US4124915A (en) * | 1977-08-15 | 1978-11-14 | S/V Tool Company, Inc. | Combination scraper and squeegee |
US4171208A (en) * | 1977-10-03 | 1979-10-16 | Clarke-Gravely Corporation | Vacuum cleaner including diverter valve |
US4277265A (en) * | 1978-10-19 | 1981-07-07 | Aktiebolaget Electrolux | Compressing arrangement for a dust container |
US4329161A (en) * | 1981-05-18 | 1982-05-11 | Jack Osborn | Valve system for vacuum cleaner |
US4482129A (en) * | 1982-06-10 | 1984-11-13 | The United States Of America As Represented By The United States Department Of Energy | All metal valve structure for gas systems |
US4581135A (en) * | 1983-08-19 | 1986-04-08 | Henry C. Kova | Self-cleaning fluid filter with a drain |
US4921510A (en) * | 1984-10-03 | 1990-05-01 | Arnold Plooy | Vacuum cleaner system |
US4733326A (en) * | 1985-05-15 | 1988-03-22 | Robert Bosch Gmbh | Protective arrangement for an electromagnetic load |
US4719662A (en) * | 1985-11-16 | 1988-01-19 | W. Schlafhorst & Co. | Dust-removal apparatus for textile machines and machine rooms |
US5002594A (en) * | 1989-08-31 | 1991-03-26 | Ransburg Corporation | Filter pulse-down cartridge cleaning mechanism |
US5178652A (en) * | 1990-09-21 | 1993-01-12 | Huettlin Herbert | Method and apparatus for guiding process gas in a filter |
US5369839A (en) * | 1992-02-28 | 1994-12-06 | Firma Fedag | Vacuum cleaner |
US5246205A (en) * | 1992-04-06 | 1993-09-21 | Donaldson Company, Inc. | Valve assembly and use |
US5368060A (en) * | 1992-09-15 | 1994-11-29 | Ab Electrolux | Valves |
US5322534A (en) * | 1993-02-11 | 1994-06-21 | Kaiser David M | Self-cleaning upside-down air filter |
US5511583A (en) * | 1995-01-24 | 1996-04-30 | Dover Resources, Inc. | Compressor valve |
US5951746A (en) * | 1995-11-30 | 1999-09-14 | Alfred Karcher Gmbh & Co. | Suction device for cleaning purposes |
US5882180A (en) * | 1996-02-01 | 1999-03-16 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Oil mist filter in a variable displacement compressor |
US5975062A (en) * | 1997-03-11 | 1999-11-02 | Pierburg Ag | Apparatus and method for periodically cleaning a charcoal canister and for periodically checking leak-tightness of a fuel system of an internal combustion engine |
US6458178B1 (en) * | 1999-10-12 | 2002-10-01 | Wap Reinigungssystems Gmbh & Co. | Filter dedusting arrangement in a vacuum cleaner |
US6440191B1 (en) * | 2000-06-14 | 2002-08-27 | Shop Vac Corporation | Vacuum cleaner filter assembly |
US6517325B2 (en) * | 2000-06-30 | 2003-02-11 | Hitachi, Ltd. | Air compressor and method of operating the same |
US6406505B1 (en) * | 2000-08-07 | 2002-06-18 | Samsung Kwangju Electronics Co., Ltd. | Vacuum cleaner having a cyclone type dust collecting apparatus |
US20020066262A1 (en) * | 2000-11-27 | 2002-06-06 | Samsung Kwangju Electronics Co., Ltd. | Cyclone dust collecting device for a vacuum cleaner |
US6782583B2 (en) * | 2000-11-27 | 2004-08-31 | Samsung Kwangju Electronics Co., Ltd. | Cyclone dust collecting device for a vacuum cleaner |
US6640385B2 (en) * | 2001-01-10 | 2003-11-04 | Samsung Kwangju Electronics Co., Ltd. | Cyclone dust collecting apparatus for a vacuum cleaner |
US20020088078A1 (en) * | 2001-01-10 | 2002-07-11 | Samsung Kwangju Electronics Co., Ltd. | Cyclone dust collecting apparatus for a vacuum cleaner |
US20020124729A1 (en) * | 2001-03-08 | 2002-09-12 | Dudley David Edmond | Self spin-cleaning canister vacuum |
US20030167590A1 (en) * | 2002-03-05 | 2003-09-11 | Samsung Gwangju Electronics Co., Ltd. | Vacuum cleaner with reusable filter |
US20050254270A1 (en) * | 2002-08-02 | 2005-11-17 | Moeller Gmbh | Control circuit for an electromagnetic drive |
US6936161B2 (en) * | 2002-08-21 | 2005-08-30 | Arvin Technologies, Inc. | Fluid filter apparatus |
US20050251953A1 (en) * | 2002-09-24 | 2005-11-17 | Dayson Technology | Vacuum cleaning head |
US20050011036A1 (en) * | 2003-07-18 | 2005-01-20 | Christy, Inc. | Ambient air backflushed filter vacuum |
US7340797B2 (en) * | 2004-06-25 | 2008-03-11 | The Hoover Company | Recovery tank for a cleaning apparatus |
US7647672B2 (en) * | 2004-07-16 | 2010-01-19 | Lg Electronics Inc. | Vacuum cleaner |
US20080086835A1 (en) * | 2005-04-11 | 2008-04-17 | Alfred Kaercher Gmbh & Co. Kg | Vacuum cleaning device |
US20080092498A1 (en) * | 2005-04-11 | 2008-04-24 | Alfred Kaercher Gmbh & Co. Kg | Method for cleaning the filters of a vacuum Cleaner and vacuum cleaner for carrying out said method |
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Also Published As
Publication number | Publication date |
---|---|
PL2049001T3 (en) | 2014-04-30 |
EP2049001A1 (en) | 2009-04-22 |
WO2008014794A1 (en) | 2008-02-07 |
DK2049001T3 (en) | 2014-01-13 |
EP2049001B1 (en) | 2013-11-13 |
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Owner name: ALFRED KAERCHER GMBH & CO. KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STEWEN, CHRISTIAN;ECKSTEIN, DANIEL;LANGEN, THORSTEN;AND OTHERS;REEL/FRAME:022581/0960;SIGNING DATES FROM 20090303 TO 20090330 |
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