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US20090205159A1 - Vacuum cleaner - Google Patents

Vacuum cleaner Download PDF

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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
Authority
US
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
Application number
US12/322,072
Other languages
English (en)
Inventor
Christian Stewen
Daniel Eckstein
Thorsten Langen
Gottfried Benzler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Assigned to ALFRED KAERCHER GMBH & CO. KG reassignment ALFRED KAERCHER GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENZLER, GOTTFRIED, STEWEN, CHRISTIAN, ECKSTEIN, DANIEL, LANGEN, THORSTEN
Publication of US20090205159A1 publication Critical patent/US20090205159A1/en
Abandoned legal-status Critical Current

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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
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Magnetically Actuated Valves (AREA)
US12/322,072 2006-07-29 2009-01-27 Vacuum cleaner Abandoned US20090205159A1 (en)

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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
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
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 (zh) * 2013-02-04 2013-06-26 上海交通大学 基于amoled面板一维分区策略动态调整供电电压的方法
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 (zh) * 2021-01-18 2021-06-04 袁小涵 一种自动恒温补水的捏合机

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PL2046182T3 (pl) 2006-07-29 2014-10-31 Kaercher Gmbh & Co Kg Alfred Odkurzacz z urządzeniem do samooczyszczania filtru
DE102016100780A1 (de) 2016-01-19 2017-07-20 Festool Gmbh Sauggerät
CN118807405B (zh) * 2024-07-16 2025-05-09 深圳市深水生态环境技术有限公司 一种高效循环式除臭设备

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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
US7867304B2 (en) 2005-04-11 2011-01-11 Alfred Kaercher Gmbh & Co. Kg Method for cleaning the filters of a vacuum cleaner and vacuum cleaner for carrying out said method
US8186005B2 (en) * 2005-04-11 2012-05-29 Alfred Kaercher Gmbh & Co. Kg Vacuum cleaning device
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
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
US7976614B2 (en) 2006-07-29 2011-07-12 Alfred Kaercher Gmbh & Co. Kg Method for cleaning the filters of a vacuum cleaner and vacuum cleaner for carrying out the method
US8142554B2 (en) * 2006-07-29 2012-03-27 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
US8510904B2 (en) 2009-04-30 2013-08-20 Alfred Kaercher Gmbh & Co. Kg Suction cleaning apparatus
US8474093B2 (en) 2009-07-07 2013-07-02 Alfred Kaercher Gmbh & Co. Kg Suction appliance for cleaning purposes
US9271620B2 (en) 2012-03-27 2016-03-01 Daryl S. Meredith Vacuum
CN103177688A (zh) * 2013-02-04 2013-06-26 上海交通大学 基于amoled面板一维分区策略动态调整供电电压的方法
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 (zh) * 2021-01-18 2021-06-04 袁小涵 一种自动恒温补水的捏合机

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DK2049001T3 (da) 2014-01-13
EP2049001A1 (de) 2009-04-22
EP2049001B1 (de) 2013-11-13
PL2049001T3 (pl) 2014-04-30

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