EP4193901A1 - Dispositif de nettoyage avec surveillance de rotation de bras de lavage et de rinçage - Google Patents

Dispositif de nettoyage avec surveillance de rotation de bras de lavage et de rinçage Download PDF

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Publication number
EP4193901A1
EP4193901A1 EP22211284.9A EP22211284A EP4193901A1 EP 4193901 A1 EP4193901 A1 EP 4193901A1 EP 22211284 A EP22211284 A EP 22211284A EP 4193901 A1 EP4193901 A1 EP 4193901A1
Authority
EP
European Patent Office
Prior art keywords
magnet
spray arm
measuring device
cleaning device
effective area
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.)
Pending
Application number
EP22211284.9A
Other languages
German (de)
English (en)
Inventor
Ivo Amrein
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.)
Gehrig Group Ag
Original Assignee
Gehrig Group Ag
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 Gehrig Group Ag filed Critical Gehrig Group Ag
Publication of EP4193901A1 publication Critical patent/EP4193901A1/fr
Pending 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0076—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals
    • A47L15/0078—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals with a plurality of fluid recirculation arrangements, e.g. with separated washing liquid and rinsing liquid recirculation circuits
    • 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0076—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals
    • A47L15/0081—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals with vertical sliding closing doors, e.g. hood-type dishwashers
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/24—Spray arms status, e.g. detection of spray arm rotation
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/26—Indication or alarm to the controlling device or to the user

Definitions

  • the invention relates to a cleaning device, in particular a commercial dishwasher or a cleaning and disinfecting device.
  • the cleaning device includes a lavatory, a first movable spray arm and a second movable spray arm. Both spray arms are arranged in the washroom and can be moved independently of each other.
  • a first magnet is arranged on the first spray arm and a second magnet is arranged on the second spray arm.
  • the cleaning device also includes a measuring device with an effective range in which an electromagnetic variable can be measured.
  • the spray arms are blocked when the user places crockery, such as cutlery or tall glasses, within the range of movement of the spray arms. In this case, the spray arms hit the dishes and stop rotating.
  • a commercial dishwasher or a cleaning and disinfection device in the medical sector can have different spray arms for the washing suds and the rinse water.
  • the task is to provide a cleaning device that delivers a reliable cleaning result.
  • the cleaning device includes a washroom in which the objects to be cleaned, for example dishes or laboratory materials, are arranged.
  • the cleaning device is in particular a commercial dishwasher or a cleaning and disinfection device that is used in the medical field.
  • the cleaning device comprises a first movable spray arm and a second movable spray arm. Both spray arms are arranged in the washroom and can be moved independently of each other.
  • the cleaning device sprays suds onto the objects to be cleaned by means of the first spray arm and rinse water onto the objects to be cleaned by means of the second spray arm.
  • a cleaning program can be designed in such a way that, in a first step, the first spray arm rotates and this sprays detergent onto the objects to be cleaned. During washing, the second spray arm is at rest. In a second step, the first spray arm is at rest and the second spray arm rotates. Through this will Rinse water sprayed on the objects to be cleaned.
  • the cleaning device also includes a first magnet and a second magnet. Both magnets are in particular permanent magnets.
  • the first magnet is arranged on the first spray arm and the second magnet is arranged on the second spray arm.
  • the cleaning device also includes a measuring device with an effective area. If the first magnet or the second magnet moves through the effective area during operation, the measuring device can detect this movement.
  • the cleaning device described has the advantage that both the movement of the first spray arm, in particular the detergent spray arm, and the movement of the second spray arm, in particular the rinse water spray arm, can be detected.
  • the cleaning device can thus monitor for both spray arms whether they are blocked in their movement. As a result of the monitoring, a reliable cleaning result can be achieved and malfunctions can be recognized and reported immediately.
  • the measuring device advantageously includes exactly one single sensor.
  • This sensor precisely measures a physical variable, in particular an electromagnetic variable. With it, the movement of the first magnet and the movement of the second magnet can be detected.
  • the production costs are correspondingly low if only a single sensor is used to be able to detect the movement of two different spray arms.
  • the measuring device is designed as follows: If the first magnet moves through the effective range of the measuring device, this movement of the first magnet or the movement of the first spray arm can be detected. This detection is also always possible when the second magnet is not moving or rests, regardless of the position at which the second magnet rests. Even when the second magnet is resting in the effective range of the measuring device, the measuring device can detect the movement of the first magnet. In other words, the second magnet cannot disturb the measuring device in such a way that the measuring device can no longer detect the first magnet.
  • the measuring device is designed as follows: If the first spray arm and the first magnet are at rest and the second spray arm moves with the second magnet, the measuring device can measure this movement independently of the stationary position of the first Detect spray arms.
  • the configuration described has the advantage that the spray arm movements can be monitored permanently and reliably. Due to its rest position, a spray arm cannot disturb the measuring device in such a way that the measuring device can no longer detect the other spray arm.
  • the measuring device is arranged outside the washroom.
  • the housing of the washroom is thus arranged between the measuring device and the two magnets.
  • detection is still possible.
  • the arrangement of the measuring device outside of the washroom has the advantage that the measuring device does not have to be protected from the effects of the washing suds.
  • the fact that the housing of the washroom must be able to be opened does not have to be taken into account for the arrangement and design of the measuring device. This is because the arrangement of a measuring device is associated with difficulties, particularly in the case of commercial hood dishwashers, because the entire hood must be able to be opened.
  • the measuring device includes a sensor with adaptive threshold value adjustment. This has the advantage that the measuring device can detect differently spaced magnets equally well.
  • the threshold value of the measuring device can be adjusted if a magnet is resting in the effective range of the measuring device and the movement of a second magnet through the effective range of the measuring device has to be detected.
  • the measuring device is advantageously a fluxgate sensor or a geomagnetic sensor (e.g. type Bosch BMM150), which comprises a Flipcor magnetic field sensor and a Hall sensor.
  • a fluxgate sensor or a geomagnetic sensor (e.g. type Bosch BMM150), which comprises a Flipcor magnetic field sensor and a Hall sensor.
  • the sensors mentioned are known to those skilled in the art and are associated with relatively low production costs.
  • the movement of the first spray arm and the second spray arm is a rotational movement.
  • the first magnet is located at the outer end of the first spray arm and the second magnet is located at the outer end of the second spray arm.
  • “Outer end” means that the magnets on the spray arms are located farthest from the center of rotation.
  • first magnet and the second magnet are each arranged within a housing, in particular consisting of a plastic.
  • the housing can be coupled to and decoupled from the first and second spray arms.
  • the plastic housing protects the magnets from the effects of the washing and rinsing water.
  • the ability to be coupled has the advantage that a magnet can be replaced.
  • the first magnet and the second magnet cause a magnetic field of the same size.
  • the design of the cleaning device is special as a result simply.
  • the measuring device cannot distinguish whether the first spray arm or the second spray arm is rotating. However, this is not relevant since the control of the cleaning device knows which spray arm is rotating by activating the corresponding pump.
  • the first magnet and/or the second magnet is a neodymium magnet.
  • the first magnet and the second magnet are spaced at least 50 mm, in particular at least 80 mm, in particular at least 90 mm, and/or at most 150 mm from the measuring device during movement through the effective range.
  • the greater distance between the measuring device and the permanent magnet allows the measuring device to be placed outside the washroom.
  • a correspondingly sensitive measuring device must be provided accordingly.
  • the lowest frequency of the frequency band is greater than 5 revolutions per minute, in particular greater than 10 revolutions per minute, in particular greater than 20 revolutions per minute. If the specified frequency is not reached, there is a fault in the system. An error message is issued.
  • the first spray arm and/or the second spray arm include a counterweight to the first magnet and/or to the second magnet, to prevent an imbalance in the rotational movement of the first spray arm and/or the second spray arm.
  • the magnet is arranged, for example, at a first end of a spray arm, the counterweight is to be arranged at the opposite end in order to achieve weight symmetry with respect to the axis of rotation.
  • the commercial dishwasher according to the Figures 1a and 1b has an equipment room 1 below.
  • a washroom 2 and a hood 3 are arranged above it.
  • the hood 3 forms the housing of the washroom 2.
  • the hood 3 is connected to the equipment compartment 1 via a rear wall 4 of the equipment.
  • the hood 3 is adjustable in height and can move up and down along the rear wall 4 .
  • Fig. 1a the guard room 2 is closed.
  • the hood 3 is in the lowest position. If the user wants to open the washroom 2 in order to remove or fill in dishes, he lifts the hood 3 by the handle 31 .
  • the hood 3 moves upwards along the rear wall 4 to a maximum of the uppermost position, as shown in Fig. 1b is shown.
  • crockery baskets 5 can be inserted into and removed from the device.
  • each spray means consists of a first spray arm 61 and a second spray arm 62.
  • a suds tank 11 can be seen schematically below the wash space 2 and a first pump 12 to guide cleaning liquid from the wash suds tank 11 upwards into the spray means 6a and 6b, from where it enters the wash space 2 and, for example, flows back into the wash suds tank 11.
  • a second pump 13 is provided in order to pump rinse water from a fresh water tank 14 into the spray means 6a and 6b.
  • the 2 shows the spray means 6a viewed from below.
  • the spraying means 6a comprises a first spray arm 61 and a second spray arm 62.
  • the first spray arm 61 sprays detergent onto the dishes to wash them.
  • the second spray arm 62 sprays rinse water onto the dishes to rinse them after washing.
  • the wash water sprays through openings 63, which are arranged on the first spray arm 61, and the rinse water sprays through openings 64, which are arranged on the second spray arm 62.
  • the first spray arm 61 and the second spray arm 61 rotate about the same center of rotation 65. However, the rotation of the two spray arms 61 and 62 is independent of each other. In the present embodiment, only one of the first spray arm 61 and the second spray arm 62 rotates. While the first spray arm 61 rotates, the second spray arm 62 rests at an arbitrary position. While the second spray arm 62 rotates, the first spray arm 61 rests at an arbitrary position.
  • a first permanent magnet 71 is arranged on the first spray arm 61 at the outer end.
  • a second permanent magnet 72 is arranged at the outer end of the second spray arm 62 .
  • Both permanent magnets 71 and 72 are protected by a plastic housing 73 and 74, respectively.
  • the plastic housings 73 and 74 with the permanent magnets 71 and 72 can be removed from the spray arms 61 and 62.
  • the permanent magnets 71 and 72 are the same size and are neodymium magnets, for example.
  • hood 3 which encloses the lavatory 2.
  • the hood 3 thus forms the housing of the washroom 2.
  • a measuring device 8 is arranged outside the washroom 2 . "Outside the washroom 2" means that between the measuring device 8 and the Washroom 2 the housing of the washroom, ie in the present embodiment the wall of the hood 3 is arranged.
  • the measuring device 8 is designed to detect the movement of the permanent magnets 71 and 72 in its effective range 81 . If the permanent magnets 71 and 72 move through the effective area 81, the minimum distance D between the measuring device 8 and the permanent magnets 71 and 72 is approximately 80 mm.
  • the measuring device 8 includes exactly one single sensor.
  • the present embodiment is a fluxgate sensor, which is an adaptive threshold sensor.
  • the measuring device 8 is suitable for detecting the movement of the two permanent magnets 71 and 72 through the effective range.
  • the measuring device 8 cannot distinguish the two permanent magnets 71 and 72 from one another. With each detection, the measuring device 8 sends a signal to the controller 9, which is shown schematically in Figures 1a and 1b is drawn.
  • the controller 9 uses the signals to determine a rotational frequency of the rotating spray arm 61 or 62 .
  • the detected rotational frequency is compared to a target frequency band, which is predetermined.
  • the frequency band for the present embodiment starts at 20 and ends at 120 rpm. If the spray arms 61 and 62 rotate within these frequencies, a satisfactory cleaning result is expected. However, if the rotational frequency falls below the minimum of 20 revolutions per minute, the controller detects a malfunction in the cleaning device and outputs a visual error message and an acoustic alarm via the display 32 . If the measured rotation frequency is too low, an unsatisfactory cleaning result must be expected.
  • the error message prompts the user to open the hood 3 to check if any dishes are blocking the rotation of the spray arms 61 and 62. Once the user has solved the problem, he closes the hood 3 and the cleaning process can be continued.
  • first spray arm 61 rotates and sprays wash water onto the dishes
  • second spray arm 62 rotates and sprays rinse water onto the dishes.
  • the other spray arm is resting.
  • the measurement of the rotational frequency of the rotating spray arm 61 or 62 is basically unproblematic. However, the situation in which the stationary spray arm rests with its permanent magnet within the effective range 81 of the measuring device 8 is special.
  • the dishwasher can also have additional sprays and simultaneously clean several dish racks.

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  • Washing And Drying Of Tableware (AREA)
EP22211284.9A 2021-12-10 2022-12-05 Dispositif de nettoyage avec surveillance de rotation de bras de lavage et de rinçage Pending EP4193901A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH070699/2021A CH719239A1 (de) 2021-12-10 2021-12-10 Reinigungsvorrichtung mit einer Wasch- und Spülarm-Rotationsüberwachung.

Publications (1)

Publication Number Publication Date
EP4193901A1 true EP4193901A1 (fr) 2023-06-14

Family

ID=84389387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22211284.9A Pending EP4193901A1 (fr) 2021-12-10 2022-12-05 Dispositif de nettoyage avec surveillance de rotation de bras de lavage et de rinçage

Country Status (2)

Country Link
EP (1) EP4193901A1 (fr)
CH (1) CH719239A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442618A1 (fr) * 1978-11-28 1980-06-27 Indesit Machine a laver la vaisselle perfectionnee
EP0534213A1 (fr) * 1991-09-26 1993-03-31 ZANUSSI GRANDI IMPIANTI S.p.A. Dispositif de contrôle des cycles de lavage et rinçage pour machines à laver la vaisselle
EP1743566B1 (fr) * 2005-07-15 2011-05-18 Miele & Cie. KG Machine à rincer
US20120312341A1 (en) * 2010-11-16 2012-12-13 Roman Rieder Apparatus for monitoring the rotation of the spraying arms of a multi-rack trolley of a cleaning machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1136460B (it) * 1980-11-28 1986-08-27 Zanussi Zeltron Inst Lavastoviglie con dispositivo di controllo della rotazione dei mulinelli
DE4018048A1 (de) * 1990-06-06 1991-12-12 Licentia Gmbh Geschirrspuelmaschine
DE102005046803B4 (de) * 2005-09-30 2008-04-03 Electrolux Home Products Corporation N.V. Geschirrspülmaschine mit Sprüharm
DE102012100671A1 (de) * 2012-01-27 2013-08-01 Miele & Cie. Kg Spülmaschine, insbesondere Gewerbespülmaschine
US20140053873A1 (en) * 2012-08-21 2014-02-27 Michael T. Watson Warewash machine system and method for detecting clogged wash arm
DE102014205266A1 (de) * 2014-03-20 2015-09-24 Robert Bosch Gmbh Verfahren und Vorrichtung zum Überwachen einer Spülarm-Funktion eines Spülarms einer Geschirrspülmaschine, Geschirrspülmaschine und Spülarm für eine Geschirrspülmaschine
DE102016217912B3 (de) * 2016-09-19 2018-02-01 BSH Hausgeräte GmbH Haushalts-Geschirrspülmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442618A1 (fr) * 1978-11-28 1980-06-27 Indesit Machine a laver la vaisselle perfectionnee
EP0534213A1 (fr) * 1991-09-26 1993-03-31 ZANUSSI GRANDI IMPIANTI S.p.A. Dispositif de contrôle des cycles de lavage et rinçage pour machines à laver la vaisselle
EP1743566B1 (fr) * 2005-07-15 2011-05-18 Miele & Cie. KG Machine à rincer
US20120312341A1 (en) * 2010-11-16 2012-12-13 Roman Rieder Apparatus for monitoring the rotation of the spraying arms of a multi-rack trolley of a cleaning machine

Also Published As

Publication number Publication date
CH719239A1 (de) 2023-06-15

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