EP4161341A1 - Distributeur d'agent de lavage pour lave-vaisselles - Google Patents

Distributeur d'agent de lavage pour lave-vaisselles

Info

Publication number
EP4161341A1
EP4161341A1 EP21734226.0A EP21734226A EP4161341A1 EP 4161341 A1 EP4161341 A1 EP 4161341A1 EP 21734226 A EP21734226 A EP 21734226A EP 4161341 A1 EP4161341 A1 EP 4161341A1
Authority
EP
European Patent Office
Prior art keywords
dispenser
washing
tank
electrodes
washing agent
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
EP21734226.0A
Other languages
German (de)
English (en)
Inventor
Marco Pizzi
Paolo BEGNAMINO
Stefano ALLERA
Massimo ZANIN
Costanzo Gadini
Alberto SCIUTTO
Daniele Cerruti
Paolo Savini
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.)
Eltek SpA
Original Assignee
Eltek SpA
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 Eltek SpA filed Critical Eltek SpA
Publication of EP4161341A1 publication Critical patent/EP4161341A1/fr
Pending legal-status Critical Current

Links

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
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids
    • 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
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4445—Detachable 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
    • 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
    • A47L2401/02—Consumable products information, e.g. information on detergent, rinsing aid or salt; Dispensing device information, e.g. information on the type, e.g. detachable, or status of the device
    • A47L2401/023—Quantity or concentration of the consumable product

Definitions

  • the present invention relates to dispensers of washing agents for washing machines, in particular household dish-washing machines, and more in particular to dispensers that are designed to be mounted on one of the walls that define a washing chamber of a dish-washing machine.
  • the invention has been developed with particular reference to multi-dose dispensers of at least one washing agent in liquid form or semisolid (gel) form, i.e., provided with a rechargeable tank, which is able to contain an amount of the aforesaid washing agent sufficient to execute a plurality of washing programs by the dish-washer.
  • US2006157086 A1 discloses a dispenser device for a dish-washing machine, which comprises a multi-dose tank for a liquid washing agent and a pump housed within the door of the dish-washing machine. Extending through the wall of the door of the dish-washing machine that faces the inside of the corresponding washing chamber are a passage for recharging the tank and a nozzle for delivery of the liquid detergent, with the delivery nozzle that is connected in fluid communication with the tank and with the pump via a duct.
  • the pump is of a reversible type in order to enable flushing of the duct and prevent any possible clogging thereof.
  • US7845361 B1 discloses a dispenser system for a dish-washing machine, comprising a multi-dose tank for a liquid washing agent and a piston dispensing pump that defines a dosing chamber, which is designed to receive from the tank a pre-set amount of the liquid additive, to be delivered in the course of an operating program of the dish-washing machine.
  • the tank and the dispensing pump are mounted in a front recess of the wall of the door of the dish- washing machine that faces the inside of the corresponding washing chamber, and are coupled in a separable way via respective fluidic attachments to enable removal of the tank for the purposes of recharging.
  • EP 2138088 A1 discloses a dispenser device for dish-washing machines having a dispenser body, defined in the front of which is a compartment that is able to contain a tablet of a washing agent.
  • the compartment is provided with a sliding hatch, via which the compartment itself can be closed after the tablet has been inserted.
  • Operatively associated to the hatch is an electrically controlled release system to bring about opening of the hatch in the course of a washing program.
  • the hatch has a substantially grid-shaped lateral extension so that, when the hatch slides into its open position, the lateral extension comes to be located in front of the compartment, to withhold the tablet inside it during continuation of the washing program.
  • EP0691101 A1 discloses an integrated dispenser device for a dish-washing machine, having a dispenser body, which is to be partially inserted into an opening of the inner side of a tiltable door of the dish-washing machine, i.e., the side that is to face the inside of the corresponding washing chamber.
  • the dispenser body defines at the front a housing, hinged in which is a multi-dose containing tank for a powder detergent, mounted for being displaceable between an inclined position of partial extraction, which enables filling of the containing tank, and an insertion position, where the front of the containing tank is substantially aligned with the front of the dispenser body.
  • the containing tank is provided at the front with a transparent window, which enables a visual check on the amount of powder detergent present.
  • the present invention is aimed at providing a dispenser of washing agents for washing machines, in particular dish-washing machines, in which, in a simple and efficient way, the risks of error by a user in use of the dispenser are limited, in particular as regards operations of charging of washing agents.
  • the present invention is aimed at providing a dispenser of washing agents for washing machines, in particular dish-washing machines, in which, even in the presence of displaceable parts that are to contain washing agents, it is possible to make available in a simple and safe way precise information regarding the content of the dispenser and/or of the aforesaid movable parts.
  • FIG. 1 is a schematic perspective view of a dish-washing machine, with a front door in the open position, the dish- washing machine being provided with a dispenser according to possible embodiments of the invention;
  • FIGS. 3 and 4 are schematic perspective views of two parts of a dispenser according to possible embodiments, corresponding, respectively, to an outer side and an inner side of the tub wall illustrated in Figure 2;
  • FIG. 6 is a schematic perspective view of the inner side of a portion of a hollow body belonging to a removable part of a dispenser according to possible embodiments;
  • FIG. 7 is a partially sectioned perspective view of a hollow body belonging to a removable part of a dispenser according to possible embodiments, with possible levels of two different washing agents highlighted;
  • FIG. 8 is a view similar to that of Figure 6, with possible levels of two different washing agents highlighted;
  • FIG. 11 and 12 are schematic perspective views of a front and a back of a fixed part of a dispenser according to possible embodiments;
  • FIGS. 13 and 14 are partial and sectioned perspective views of a removable part and a fixed part, coupled together, of a dispenser according to possible embodiments, in two respective different conditions;
  • FIG. 15 is a schematic perspective view of a removable part and a fixed part, uncoupled from one another, of a dispenser according to possible embodiments;
  • FIGS. 16 and 17 are schematic cross-sectional views of a hollow body belonging to a removable part of a dispenser according to possible embodiments, according to a complex plane of section that passes through two corresponding retention valves;
  • FIG. 18 is a schematic vertical cross-sectional view of a dispenser according to possible embodiments.
  • FIG. 20 is a schematic rear perspective view of a fixed part of a dispenser according to possible embodiments, with some components removed;
  • - Figure 21 is a schematic rear view, in elevation, of a dispenser according to possible embodiments in a first operating condition, with a corresponding component represented only partially;
  • - Figure 22 is a partial schematic perspective view of a portion of the dispenser part of Figure 21, in the aforesaid first operating condition, with a corresponding component removed;
  • Figures 23-24, 25-26, 27-28 and 29-30 are views similar to those of Figures 21-22, respectively, of the dispenser in a second, third, fourth, and fifth operating condition, respectively;
  • FIG. 32 is a schematic partial horizontal cross section of the dispenser of Figure 31, with the corresponding blocking/unblocking arrangement in the aforesaid first condition;
  • Figures 33-34 and 35-36 are views similar to those of Figures 31-32, respectively, of the dispenser in a second condition and a third condition of the corresponding blocking/unblocking arrangement;
  • FIG. 37 is a schematic partial cross-sectional view of a dispenser according to possible embodiments.
  • FIG. 38 is a partial schematic perspective view of a fixed part of a dispenser according to possible embodiments.
  • FIG. 39-40 are schematic perspective views of a dispenser according to possible embodiments.
  • FIG. 42 is a schematic perspective view that shows in isolation some components of a warning system of a dispenser according to possible embodiments
  • FIG. 43 and 44 are schematic partial cross-sectional views, according to different planes of section, of a dispenser according to possible embodiments;
  • FIG. 45 and 46 are schematic partial views, respectively a front view and a sectioned perspective view, of a bottom area of a part of a dispenser according to possible embodiments;
  • FIG. 47 is a schematic partial view in partial cross section of a portion of a dispenser according to possible embodiments.
  • - Figures 48 and 49 are views similar to those of Figures 45-46, regarding a dispenser according to possible alternative embodiments;
  • - Figures 50 and 51 are graphs that exemplify the results of measurements of an electrical quantity made by a sensor device that equips a dispenser according to possible embodiments;
  • FIG. 52 is a simplified diagram of a possible control circuit of a dispenser according to possible embodiments.
  • FIG. 53 is a simplified diagram of a first possible driving circuit of a sensitive element of a sensor device of a dispenser according to possible embodiments;
  • FIG. 54 and 55 are graphs that exemplify the results of further measurements of an electrical quantity made by a sensor device that equips a dispenser according to possible embodiments;
  • FIG. 56 is a simplified diagram of a second possible driving circuit of a sensitive element of a sensor device of a dispenser according to possible embodiments;
  • Figures 57 and 58 are schematic perspective views of a bottom area of a part of a dispenser, equipped with a sensor device according to possible embodiments, Figure 58 being in partial cross section;
  • Figure 59 is a schematic perspective view of a body of a sensor device that equips the dispenser of Figures 57-58;
  • FIG. 60 and 61 are a schematic perspective view and an exploded view, respectively, of a bottom area of a part of a dispenser according to possible embodiments, equipped with a sensor body according to a possible variant;
  • FIG. 62 is schematic perspective view in partial cross section of a bottom area of a part of a dispenser equipped with a sensor device according to possible embodiments;
  • FIG. 63 and 64 are schematic views, respectively a perspective view and an exploded view, of a part of a sensor device according to possible embodiments;
  • Figure 65 is a view similar to that of Figure 63 regarding a possible variant
  • Figures 66-67 are graphs that exemplify the results of measurements of an electrical quantity made by a sensor device provided with a part of the type illustrated in Figures 63-64;
  • Figures 68-69 are graphs that exemplify the results of measurements of an electrical quantity made by a sensor device provided with a part of the type illustrated in Figures 63-64, but with an insulating coating removed;
  • FIG. 70 is a schematic perspective view of a sensor device for a dispenser, according to possible embodiments.
  • Figures 71 and 72 are, respectively, a schematic sectioned perspective view and a schematic exploded view of the sensor device of Figure 70;
  • Figures 73 and 74 are schematic representations aimed at exemplifying a possible principle of operation of a sensor device of the type illustrated in Figures 70- 72;
  • FIGS 75-77 are schematic cross-sectional views of a bottom area of a dispenser equipped with a sensor device according to further possible embodiments;
  • FIG. 78 is a partial schematic perspective view in partial cross section, of a dispenser according to possible embodiments.
  • Figures 79-82 are schematic top plan views of some components of a blocking/unblocking arrangement that equips the dispenser of Figure 71, in as many different conditions.
  • references to “an embodiment” or “one embodiment” in the framework of the present description is intended to indicate that a particular configuration, structure, or characteristic described with reference to the embodiment is comprised in at least one embodiment.
  • phrases such as “in an embodiment”, “in one embodiment”, “in various embodiments”, and the like that may be present in various points of this description do not necessarily refer to one and the same embodiment.
  • particular conformations, structures, or characteristics defined in the framework of the present description may be combined in any adequate way in one or more embodiments, even different from the ones represented.
  • the reference numbers and spatial references (such as “upper”, “lower”, “top”, “bottom”, etc.) used herein are provided merely for convenience and hence do not define the sphere of protection or the scope of the embodiments.
  • detergent is intended to designate a detergent substance to be used during washing steps in a strict sense of an operating program of a dish-washing machine, i.e., steps aimed mainly at removal of dirt from the dishes
  • additive is intended to designate an accessory liquid or semisolid substance, used in steps different from the washing steps or in purposely provided programs, such as a rinsing additive (or brightener), or a perfuming substance, or a water- softening substance, or a hygienizing substance
  • washing agent is intended to designate indifferently the detergent substance or the accessory substance.
  • liquid when associated to terms such as “detergent”, “additive”, “washing agent” (single and plural), is intended in any case to designate - in addition to a liquid substance - also a semiliquid/semisolid substance, such as a gel.
  • FIG. 1 Shown schematically in Figure 1 is a household dish-washer, designated as a whole by 1, equipped with a dispenser of at least one washing agent, which is obtained according to possible embodiments.
  • the machine 1 is intended for washing dishes so that in what follows reference will be made for simplicity to a dish-washing machine, without prejudice to the fact that the invention may be applied also to other types of washing machines, such as laundry washing machines and washer-dryers, in which case the dispenser could be located differently according to the type of machine (top-loading or front-loading machine).
  • the dish-washing machine 1 has a cabinet or structure 2 defining inside it a washtub or washing chamber 3.
  • Designated as a whole by 4 is a front door of the dish washing machine 1, associated to the cabinet 2 so that it can be moved between an open position and a closed position.
  • the door 4 can be moved angularly between the aforesaid positions, preferably but not necessarily about a substantially horizontal axis.
  • the dish-washing machine 1 could, however, be of some other type, for example, with at least one door that can translate or slide on purposely provided guides, for example, as in FR-A-2.674.426 A, or else with a rack for containing the dishes configured as a sliding tray, the front wall of which forms a door of the machine, for example, as in W09833426 A.
  • the inner face of the door 4 includes a movable tub wall 5 (also known as “counter-door”), having an outer side 5a that constitutes the front surface of the tub 3.
  • the tub 3 is also delimited by a plurality of fixed tub walls, one of which designated by 6, which typically comprise two side walls, a rear wall, an upper wall or roof, and a lower wall or bottom.
  • the walls that delimit the tub 1 are plate- like walls, made at least in part of sheet metal, such as stainless steel.
  • walls made at least in part of plastic material for example, via injection moulding of a thermoplastic material.
  • a dispenser of washing agents mounted on one of the walls that delimit the tub 3 - here the wall 5 - is a dispenser of washing agents, designated as a whole by 10 and represented only schematically in Figure 1, obtained according to possible embodiments of the invention.
  • the dispenser 10 is mounted at at least one through opening defined in the mounting wall 5.
  • the dish-washing machine 1 comprises all the elements normally known for its operation, which are irrelevant for the purposes of the invention and will hence not be described herein, amongst which a hydraulic circuit including a sprinkling system, at least one dish rack in the tub, and a control system that superintends operation of the machine.
  • the control system is only represented schematically and designated by CS, and comprises, for example, a controller or control card, preferably including an electronic microcontroller, which can be located inside the door 1.
  • the dispenser 10 installed on the wall 5 of the door 4 is to be understood as being provided merely by way of example in so far as, in other embodiments, the dispenser 10 can be installed on any of the walls of the tub 3, including a stationary wall, such as the side wall designated by 6. Consequently, what is described hereinafter regarding installation of the dispenser 10 on the wall 5 is to be understood as exemplifying also installation of the dispenser 10 on any other wall of the tub 3, in particular a fixed vertical wall thereof.
  • the side 5a defined herein as “outer” side of the mounting wall 5 of the dispenser 10 indicates the surface of the wall that faces the inside of the tub 3, whereas the side defined herein as “inner” side (hereinafter designated by 5b) indicates the surface of the wall itself opposite to the outer side 5a, for example, corresponding to the inner side of a gap of a wall of the machine.
  • the dispenser i.e., its body as a whole, comprises at least two main functional parts, amongst which at least one first removable part that is configured so that it can be coupled in a releasable way to at least one second part, which is fixed on the mounting wall 5, in particular at the aforesaid through opening.
  • Each of the two main parts of the dispenser body in turn comprises a number of elements, described hereinafter.
  • the dispenser 10 is illustrated in an assembled operating condition with respect to the wall 5, with the removable dispenser part coupled on the fixed dispenser part.
  • the dispenser body as a whole has a width dimension X, a height dimension Y, and a depth dimension Z, the latter dimension being identified by a front and a back of the body of the dispenser 10, its front being the one that is designed to be exposed or faces the inside of the tub 3 of the dish-washing machine.
  • the removable dispenser part and the fixed dispenser part which form as a whole the dispenser body, are designated, respectively, by 100 and 200 in Figures 3 and 4, where they are illustrated in a condition where they are uncoupled with respect to the outer side 5a and the inner side 5b of the wall 5, respectively.
  • the parts 100 and 200 are visible in isolation in Figures 5 and 11, in front perspective view.
  • the removable dispenser part 100 comprises a hollow body 101 that mainly performs functions of tank for at least one washing agent in liquid or semisolid form (i.e., in the form of gel).
  • the hollow body 101 defines inside it at least two tanks, designated as a whole in Figure 2 by R1 and R2, each for a respective washing agent of the type referred to.
  • R1 and R2 each for a respective washing agent of the type referred to.
  • the tank Rl of greater capacity, is designed to contain a washing detergent
  • the tank R2 is designed to contain a rinsing additive, in particular a brightener.
  • the tank R2 could on the other hand be designed to contain a different accessory substance, for example, a perfuming substance, or a water- softening substance, or a hygienizing substance. It should in any case be noted that the removable dispenser part 100 could include a single tank , or else three or more tanks, for further washing agents.
  • the at least one tank Rl and/or R2 is preferably of a multi-dose type, i.e., one that is able to contain an amount of the corresponding washing agent sufficient for executing a plurality of operating programs of the dish-washing machine 1.
  • the terms “removable part” or “tank”, when referred to the component designated as a whole by 100, are understood to designate a rechargeable component that stably equips the dispenser, constituting an essential part thereof, and that is provided with at least one loading passage provided with a respective removable closing means to enable a user to top it up periodically.
  • the body part 100 does not hence represent a disposable component, such as a cartridge previously filled with the washing agent in the production stage and marketed in this ready-to-use version, which typically presupposes perforation or tearing of its body for the purposes of use, and then disposal thereof when it is empty.
  • the hollow body 101 is preferentially made of plastic material, for example, a thermoplastic material.
  • the body 101 is made up of at least two pieces or parts sealed together, for example, a front piece 1011 and a rear piece IOI2.
  • the body pieces 1011 and IOI2 may, for example, be moulded using thermoplastic material and sealed together at corresponding interface surfaces, for example, welded using a hot-blade system.
  • identified in the hollow body 101 are an upper portion 101a, that is as a whole deeper (dimension Z) and shorter (dimension Y), and a lower portion 101b, that is as a whole thinner (dimension Z) and taller (dimension Y).
  • the two portions 101a and 101b may have the same width (dimension X).
  • the fact that the portion of the hollow body 101 having a larger surface (i.e., the lower portion 101b) is thinner enables limitation of the front dimensions of the dispenser 10, in particular when it is on the door 4 of the dish-washing machine.
  • the dispenser 10 can advantageously be mounted in a position of the tub wall 5 such that - with the door closed - only the lower portion 101b will come to be located in front of a dish rack housed in the tub 3, thus preventing the need to provide shorter racks and hence ones that have a smaller loading capacity.
  • the presence of a deeper upper portion 101a may prove convenient to facilitate definition of a loading passage for topping-up of the corresponding tank with the washing agent, with a corresponding closing element that is operable by a user, such as a plug or a hatch.
  • Both of the portions 101a and 101b are hollow, at least for a substantial part thereof.
  • the maximum depth (dimension Z) of the hollow body 101 in each area thereof is smaller than its width (dimension X) and its height (dimension Y).
  • the height (dimension Y) of the hollow body 101 is smaller than its width (dimension X).
  • the at least one tank R1 and/or R2 of the removable dispenser part 100 has a respective loading passage, i.e., a respective passage for filling the respective tank, associated to which is a suitable closing element that can be opened and closed by a user, such as a plug or, as in the examples illustrated, a hatch. It is possible to provide also a plug in an area subtended by a movable hatch.
  • both of the tanks Rl, R2 have a respective loading passage, designated as a whole by 103, which includes a through opening 103a in the front wall 102 of the hollow body 101.
  • the opening 103a is defined at a bottom of the passage 103, preferably shaped as a substantially cylindrical recess.
  • each loading passage 103 is a corresponding closing element, here constituted by a hatch 104i, 104 2 , for example, made of moulded plastic material.
  • each hatch 104i, 104 2 is hinged to the hollow body 101 in order to be able to move angularly between an open position (Figure 5), to enable access to the corresponding loading passage 103 for the purposes of topping-up of the corresponding tank Rl or R2 with the washing agent, and a closed position ( Figure 3), where the corresponding loading passage 103 is closed by the hatch.
  • a plug in addition to the hatch.
  • each hatch 104i, 104 2 is hinged, in a lower region thereof (with reference to the dimension Y), to the hollow body 101, but this does not constitute an essential characteristic: at least one hatch could be hinged in a side region thereof, or else it could be a hatch of a type that slides in a direction transverse to the corresponding loading passage, according to known technique in the field of dispensers for dish- washing machines.
  • Designated by 104c in Figure 6 are parts of the hinging means of the hatches 104i, 104 2 .
  • each loading passage 103 has an edge in relief 103b, preferably having a circular profile, upon which a corresponding gasket 104a made of elastomer can bear at the front in order to obtain a seal.
  • the gasket 104a is mounted in a corresponding seat defined in the inner side of the corresponding hatch 104i, 104 2 .
  • a receiving seat defined in the front of the hollow body 101 is a receiving seat, designated by 103c in Figure 5, in particular in the form of a recess of the aforesaid front, in which the loading passage 103 is located.
  • the seat 103c is configured to be occupied at least partially by the corresponding hatch 104i, 104 2 , when the latter is in the respective closed position.
  • the dispenser is mounted on a tiltable door of the dish washing machine, and associated to the at least one tank is a system for taking in the respective washing agent that bases its own operation on the movements of the door.
  • a system for taking in the respective washing agent that bases its own operation on the movements of the door.
  • Such an intake system is preferably associated to the tank of smaller capacity R2, which is in any case able to contain an amount of washing agent sufficient for execution of a number of treatment programs performed by the dish-washing machine 1.
  • R2 is a sub-chamber or intake volume, which is able to contain at least one amount of the washing agent sufficient to execute a single treatment program.
  • the intake system comprises, or has associated to it, valve means, which include, in particular, an open/close element operating at the corresponding outlet passage of the washing agent.
  • the aforesaid valve means can be controlled to enable outflow of at least one dose of washing agent coming from the intake volume towards the inside of the washtub 3 of the dish-washing machine 1, through the outlet passage referred to previously.
  • the intake system is devised so that, when the door 4 of the dish-washing machine 1 is brought into the substantially horizontal open position, the intake volume is filled by a corresponding part of the content of the tank R2, and when the door 4 is subsequently brought into the substantially vertical closed position, the intake volume is able to withhold the corresponding content, at least until activation of the aforesaid valve means.
  • FIG. 6 Partially represented in Figure 6 is a possible internal structure of the hollow body 101, in particular of its front body piece 1011, where some of the elements belonging to the aforesaid intake system are visible.
  • a first set of walls defined as a whole by 106 (see also Figures 16-17), arranged so as to delimit the tank R2 within the internal volume of the hollow body 101, in fluid communication with the opening 103a of the corresponding loading passage 103: in the example illustrated, the remaining part of the internal volume of the hollow body 101 substantially forms the tank R1 of greater capacity.
  • Visible in Figure 6 is just part of the set of walls 106 defined integrally in the front body piece 1011, but of course also the rear body piece IOI2 can define a respective part of said set of walls.
  • a second set of walls designated as a whole by 107 (see also Figures 16-17), arranged so as to delimit, within the tank R2, an intake volume designated by R2a.
  • the intake volume R2a is defined higher up than the bottom of the tank R2 (with reference to the height dimension Y) and is in fluid communication with a discharge outlet of the tank itself (in Figure 6 the aforesaid outlet is not visible, but it is in a position corresponding to the valve member designated by 230 2 , described hereinafter).
  • the volume R2a is sized - in particular via an upper edge 107a thereof - so as to be able to contain a fraction of the washing agent contained in the tank R2, this fraction being preferably greater than a single deliverable dose of the aforesaid washing agent.
  • Figure 6 shows only part of the set of walls 107 defined integrally in the front body piece 1011, but of course also the rear body piece IOI2 can define a respective part of the aforesaid set of walls.
  • the volume R2a is configured for being filled with the aforesaid fraction of the washing agent of the tank R2 when the plane of lie of the dispenser 10 is substantially horizontal (i.e., when the door 4 of the dish-washing machine 1 is open) and withholding the fraction itself when the plane of lie of the dispenser 10 is substantially vertical (i.e., when the door 4 of the dish-washing machine is closed), for the purposes of subsequent delivery, as described hereinafter.
  • the level of filling of the intake volume is defined by an upper edge 107a of the second set of walls, which functions as overflow.
  • the removable dispenser part 100 i.e., the hollow body 101
  • the agent WD may be a washing detergent
  • the agent WA may be a rinsing additive
  • the next Figure 8 shows just the front piece 1011 of the hollow body 101, in the presence of a minimum level of the washing agents WD and WA contained in the tanks R1 and R2 (the representation of the washing agents WD and WA is here merely illustrative, aimed only at exemplifying the condition discussed).
  • a minimum level of the washing agent WA also in the case represented, displacement of the door 4 from the horizontal opening position to the vertical closing position brings about filling of the intake volume R2a substantially up to the level of overflow defined by the upper edge 107a of the second set of walls 107.
  • a constant filling of the intake volume R2a is guaranteed, substantially up to the level of overflow, both in the case minimum level and in the case of maximum or intermediate level of the washing agent WA in the respective tank R2.
  • FIG. 6-8 Also visible in Figures 6-8 is part of a sensor, which, in various embodiments, it can be used for signalling the possible drop in the level of the washing agent WA below a pre-set minimum value.
  • the sensor comprises a floating body 110 constrained within the tank R2 so as to carry out displacements that are a function of the level of the liquid agent WA.
  • the floating body 110 is hinged to a pin 110a, for example, defined integrally by the front piece 1011 of the hollow body 101, so as to be able to oscillate between a raised position, represented in the figures, and a lowered position.
  • the floating body 100 could be constrained in some other way, for example, for being linearly slidable in the direction of height of the dispenser (dimension Y), for example, via purposely provided lateral guides defined in the hollow body 101.
  • an element 110b for excitation of an electrical detector set on the outside of the hollow body 101, in particular mounted on the fixed dispenser part 200 in a position to which the floating body 110 will come to correspond when the removable dispenser part 100 is mounted on the fixed dispenser part 200.
  • a detector is designated by RD only in Figure 3 and is represented in a position set behind a wall of the front of the fixed dispenser part 200.
  • the excitation element 110b is a magnetic element
  • the corresponding detector RD on the outside of the hollow body 101 is a detector of magnetic field, in particular a Hall-effect detector, or a contact or magnetic switch, for example, of a reed type.
  • the walls of the hollow body 101 and of the front of the fixed dispenser part 200 that are set between the floating body 110 and the detector RD are made of a material permeable to the magnetic field generated by the excitation element 110b.
  • the floating body 101 When an amount of washing agent WA higher than a pre-set minimum level is present in the tank R2, the floating body 101 remains in its raised position, consequently exciting (or not exciting) the corresponding external electrical detector RD. Instead, when the amount of the washing agent WA drops below the aforesaid pre-set minimum level, the floating body 110 is brought to assume the corresponding lowered position, consequently no longer exciting (or starting to excite) the corresponding external electrical detector RD.
  • the information on the level thus generated by the level sensor 110-RD may, for example, be used for activating a warning system, aimed at alerting a user of the dish-washing machine 1 to the need for topping-up of the tank R2 with the washing agent WA. After such a topping-up, of course, the floating body 110 will return to the respective raised position, thus causing the warning signal to cease.
  • the principle of detection of the displacement of the floating body 110 may be different from the one based upon detection of a magnetic field; for example, it may be a detection of an inductive or optical type (for example, the wall of the hollow body 101 that separates the floating body 110 from the corresponding external electrical detector may be transparent to optical radiation, at least in an area corresponding to the floating body, and the wall of the front of the fixed dispenser part 200 located behind which is a detector RD of an optical type is likewise transparent or has a transparent window, at least in an area corresponding to the detector).
  • an inductive or optical type for example, the wall of the hollow body 101 that separates the floating body 110 from the corresponding external electrical detector may be transparent to optical radiation, at least in an area corresponding to the floating body, and the wall of the front of the fixed dispenser part 200 located behind which is a detector RD of an optical type is likewise transparent or has a transparent window, at least in an area corresponding to the detector.
  • a floating system of the above sort can be used also for the tank Rl. Measurement of the level in the tank R1 and/or R2 could be made using other detection techniques, such as a system based upon the use of an optoelectronic sensor, including a light emitter and a light receiver.
  • such an optoelectronic sensor can be set on the fixed dispenser part 200 (for example, in a position corresponding to a transparent window provided in the front of the part 200) so that, when the removable dispenser part 100 is in the respective operating position, the optoelectronic sensor is in a position facing an optical prism defined by a transparent wall of the hollow body 101 (for example, its rear wall) that delimits a side of the corresponding tank Rl and/or R2.
  • the prism when the prism is immersed in the liquid washing agent, the light beam emitted by the emitter is in part reflected and in part refracted at the inclined walls of the prism immersed in the liquid, not reaching the receiver, or reaching it with limited intensity: in this way, the presence of the liquid washing agent at a level corresponding to the position of the sensor can be inferred.
  • the prism when the prism is not immersed in the liquid washing agent, the light beam will be substantially completely reflected at the inclined walls of the prism, reaching the receiver, or reaching it with high intensity: in this way, the absence of the liquid washing agent at a level corresponding to the position of the sensor can be inferred.
  • the dispenser comprises at least one corresponding latching/releasing device, which can be switched manually between a latching position and releasing position, to enable displacement of the hatch itself between the closed position and the open position.
  • latching/releasing device which can be switched manually between a latching position and releasing position, to enable displacement of the hatch itself between the closed position and the open position.
  • each hatch 104i, 104 2 is a corresponding latching/releasing device 105i, 105 2 , respectively.
  • the two devices designated by 105i, 105 2 preferentially have a similar structure and are mounted in a substantially specular way with respect to one another.
  • the at least one latching/releasing device 105i, 105 2 is mounted on the hollow body 101, in particular so as to have an accessible portion, designated by 105a, which is manually operable, for example, displaceable with an angular movement.
  • 105a an accessible portion
  • the portion that is operable projects beyond the upper edge (with reference to the dimension Y) of the hollow body 101, and the device 105i, 105 2 is mounted at the back of the hollow body 101.
  • the operable portion 105a defines, or has associated to it, a latching element 105b, which is able to co-operate with the corresponding hatch in order to keep it in the closed position.
  • the body of the hatch 104i and/or 104 2 defines a seat 104b, in an area thereof opposite to the hinging side, where the engagement element 105b engages when the corresponding hatch is closed (see Figure 3).
  • the at least one latching/releasing device 1051 and/or 105 2 basically consists of a lever element, which is hinged to turn about a respective axis that substantially extends in the depth direction (dimension Z) of the dispenser 10.
  • the axis of rotation can be defined by a pin 105c defined or associated to the back of the hollow body 101, and the lever element 1051 and/or 105 2 comprises a lever arm 105d that defines or has associated thereto the operable portion 105a, with the corresponding latching element 105b ( Figures 3, 5).
  • lever element 1051 and/or 105 2 there can also be associated to the lever element 1051 and/or 105 2 a spring or similar elastic element, according to a technique in itself known, operative for urging the element itself towards the respective latching position relative to the corresponding hatch 104i and/or 104 2 .
  • the lever element 1051 and/or 105 2 is substantially in the form of a first-class lever, and hence also has another lever arm 105e, which extends at the part generally opposite to the lever arm 105d.
  • the function of this possible further lever arm 105e will be explained hereinafter in relation to a locking/unlocking arrangement that can equip the dispenser according to various embodiments.
  • a housing configured to receive a tablet including one or more washing agents, and hence also tablets of the type known as “two-in-one” or “three-in-one”.
  • tablette is intended to designate both tablets in solid form and tablets - also known as “tabs” or “pods” - of the type in which one or more washing agents in liquid or semisolid form are enclosed in a casing consisting of a water-soluble film (typically a polymer, such as polyvinyl acetate - PVA).
  • the housing referred to is directly exposed as a whole, at the front of the dispenser, i.e., without hatches or similar movable closing elements.
  • the housing has a front containment portion that is directly exposed at the front of the dispenser body, and has a bottom that extends in a direction transverse to the height dimension Y and that has at least one drainage passage.
  • the at least one drainage passage is defined between the front containment portion and the bottom of the housing.
  • the front containment portion has a perforated structure, i.e., defining one or more openings, for example, a grid structure.
  • the containment portion defines a front of the housing and, preferentially, also at least part of at least one of two opposite lateral sides of the housing.
  • the housing has an upper opening, i.e., generally opposite to the bottom, configured to enable insertion of a tablet in the housing itself. This facilitates considerably loading and dissolving of a tablet.
  • Such a housing is designated by 300 in Figures 2-5, whereas designated by 301, 302 and 303 are the respective front containment structure, the respective bottom, and a respective drainage channel (see also Figure 18).
  • a tablet of one or more washing agents is exemplified only in Figure 5, where it is designated by T.
  • the housing 300 is open at the top, to enable convenient insertion of the tablet T.
  • a tablet T can be inserted in the housing 300 prior to execution of a washing program.
  • part of the water sprayed into the tub 3 of the dish-washing machine 1 for example, by means of a known rotating- sprinkler system, can reach the housing 300, favouring dissolving of the tablet T and outflow of the corresponding mixture of water and washing agent towards the inside of the tub 3.
  • This effect is made possible by the presence of the at least one drainage passage 303, defined between the front containment portion 301 and the bottom 302.
  • the effect of dissolving the tablet T and pouring the washing agent into the tub is further favoured by the presence of the front containment portion 301 provided with openings, preferably comprising an alternation of full and empty spaces, such as a substantially grid-like structure, as in the case exemplified.
  • the presence of one or more openings at the front of the housing 300 facilitates the passage of the water sprayed at inlet and of the water-detergent mixture at outlet.
  • One or more jets of water can also arrive with a certain energy at the opening or openings of the portion 301, hitting directly part of the tablet T with a certain energy, which favours dissolving thereof.
  • a rotating sprinkler of the dish-washing machine 1 can be pre arranged for directing at least one jet of water to a height corresponding to that of the housing 300 (for this purpose, a thrust nozzle of the sprinkler could, for example, be used).
  • a thrust nozzle of the sprinkler could, for example, be used.
  • the jets of water can strike the tablet T directly via the upper opening or at the top of the containment portion 301, when this forms a sort of “parapet” for the tablet itself.
  • the front containment portion can have a height (dimension Y) even smaller than the overall height of the housing 300 or of the tablets of various shapes that it can receive, and in particular a height sufficient to withhold effectively a tablet T within the housing 300 notwithstanding the typical vibrations of the dish washing machine 1 during operation and notwithstanding the energy of the possible incident jets of water.
  • the withholding function is performed by the portion 301 also in the course of the movement of closing and engagement of the door 3 of the dish washing machine 1, when the dispenser 10 is mounted on the wall 5.
  • the presence of one or more drainage passages 303 between the containment portion and the bottom 302 is likewise aimed at enabling outflow of the water and/or of the mixture of water and washing agent from the housing 300 in order to prevent any stagnation inside the housing itself.
  • the bottom 302 of the housing 300 extends generally inclined downwards from its back towards its front (see also Figure 18).
  • the bottom 302 can be made inclined in the production stage, or else its inclination can be obtained by mounting the dispenser 10 on the corresponding mounting wall 5.
  • transverse and upright parts - some of which are designated in Figure 18 by 301a and 301b, respectively - are preferably in the form of small rods or bars. More in general, the structure described for the housing 300 and/or for the front containment portion 301 as a whole makes it possible to obtain these elements via moulding of plastic material, preferably of a single piece with the corresponding part of the dispenser body, without requiring fixing of separate parts.
  • each recess 116 extends from the peripheral surface 114b of the recess 114 as far as the upper edge of the hollow body 101 and houses part of a respective latching/releasing device 105i, 105 2 as described previously.
  • the fixed dispenser part 200 is visible in Figures 3 and 4, as regards the outer side 5a and the inner side 5b of the corresponding mounting wall 5, in partial exploded view in Figures 9-10, and in isolation in Figures 11 and 12.
  • the fixed dispenser part 200 includes a main body 201, which is designed to be mounted in a through opening of the wall 5, preferably an opening having a substantially circular profile.
  • the main body 201 may be made of plastic material, for example, via moulding; if necessary, also the body 201 may be formed by a number of parts joined together, for example, welded together or coupled in a separable way, possibly with interposition of sealing elements.
  • a front portion of the main body 201 projects at the front with respect to the outer side 5a of the wall 5, in particular for being received in the recess 114 described above ( Figure 4), of the back of the removable dispenser part 100.
  • This projecting portion 203 of the main body 201 is formed by the bottom wall 201a and by the part of peripheral wall 201bi that extends in front of the flange 201c.
  • the bottom wall 201a is substantially circular
  • the peripheral wall 201bi-201b 2 or at least its part 201bi, is substantially cylindrical.
  • the at least one first functional element is accessible in the front area of the fixed dispenser part so that it can be operatively coupled to, or uncoupled from, the at least one second functional element.
  • the front portion of the fixed dispenser part can be shaped for supporting and/or guiding and/or positioning an aforesaid first functional element.
  • each formation 205 performs functions of positioning and/or guiding for at least one locking element, belonging to the aforesaid locking/unlocking arrangement, and for at least one light-transmitting element, belonging to the aforesaid signalling arrangement, which are preferably substantially parallel to one another and extend axially in the height dimension Y of the dispenser; in Figure 11, two of the aforesaid locking elements are designated by 206i and 200 2 , whereas two of the aforesaid light-transmitting elements are designated by 207.
  • At the front of the fixed dispenser part 200 i.e., of the bottom wall 201a of its main body 201 at least one inlet for a washing agent opens, this inlet being designed for connection with a corresponding outlet of a tank defined in the removable dispenser part 100.
  • a first inlet 210 and a second inlet 211 are provided, preferably defined by positioned tubular ducts, to which the outlets 112 and 113 ( Figure 4) of the tanks R1 and R2, respectively, are couplable in a separable way.
  • At the front of the fixed dispenser part 200 i.e., of the wall 201a of its main body 201 at least one passage 212 for dispensing a washing agent opens.
  • this passage 212 opens at a grooves or recess 213 of the front surface of the bottom wall 201a, which extends downwards (with reference to the dimension Y) at least between the passage 212 itself and the part of peripheral wall 201bi of the main body 201, for the purpose described hereinafter.
  • the passage 212 is associated to an arrangement for dispensing the washing agent coming from the tank R2.
  • the dispenser has a dispensing arrangement for the washing agent contained in a tank of the removable dispenser part, comprising a pump that is preferably mounted on the fixed dispenser part.
  • a pump that is preferably mounted on the fixed dispenser part.
  • at least part of the pump is set within a corresponding housing defined at the front of the fixed dispenser part.
  • at least part of this housing extends towards the inside of the washtub 3; i.e., it extends beyond a plane identified by the mounting wall 5 of the dispenser 10. In this way, the housing, and hence at least part of the pump, can be located on the outside of the door 3 of the dish washing machine 1 or in any case in an easily accessible position, which proves useful, for example, for the purposes of maintenance/repair/cleaning.
  • such a housing is designated by 214 and is defined in the wall 201a of the main body part 201. As may be noted, at least part of the housing extends at the front beyond the flange 201c used for mounting the fixed dispenser part 200.
  • the housing 214 is preferentially closed by a corresponding removable lid, designated by 215, for example, in Figures 3 and 9-10, with possible interposition of sealing means, not represented.
  • the lid 215 is mounted in a removable way to facilitate cleaning of the housing 214 and/or of the pump; in particular, the lid 215 can then be removed from the tub side.
  • the lid 215 is shaped in order to define a passage 215 for the inlet 210.
  • defined on the outer surface of the bottom wall 201a of the main body 201 is a seat 216 for the lid 215.
  • At least part of the pump is mounted or accessible at a front portion of the fixed dispenser part, which in the example is represented by the front projecting portion 203 (as has been seen, the portion 203 can be received in the corresponding seat 114 defined in the back of the removable dispenser part 100).
  • the part of peripheral wall 201t> 2 of the main body 201 which extends behind the flange 201c and is to be inserted through the corresponding through opening of the mounting wall 5, is pre-arranged for coupling with at least one retention element for fixing the fixed dispenser part 200 to the wall itself.
  • the part of peripheral wall 2011 3 ⁇ 4 has a male thread (not shown) on its outer surface, on which a retention ring-nut, designated as a whole by 217, provided with a corresponding female thread 217a, is to be screwed (see also Figure 4, for the assembled condition of the two parts in question).
  • the part of peripheral wall 201b 2 of the main body 201 and the retention element - here represented by the ring-nut 217 - could have some other shape and/or be provided with other means of mutual coupling, for example, in the form of an attachment of the bayonet type and/or means at least in part elastic for mutual engagement and/or provided with holes and corresponding fixing screws.
  • the retention element 217 may be made of plastic material.
  • the bottom wall 201a and the peripheral wall 201bi-201bi of the main body 201 define a cavity, designated as a whole by C, for example, in Figures 4, 9, and 12, mounted or defined in which are one or more functional elements of the dispenser 10, described hereinafter.
  • the dispenser comprises an arrangement operable by a user to cause coupling and uncoupling of the removable dispenser part to/from the fixed dispenser part.
  • the coupling/uncoupling arrangement comprises at least one element that, albeit mounted on the fixed dispenser part, is operable in the front area of the dispenser, i.e., its part that is designed to project towards the inside of the washtub of the machine 1.
  • the member 220 has a ring-shaped body, including a generally cylindrical peripheral wall 220a, from which - preferably but not necessarily - a flange 220b projects radially outwards.
  • the ring-shaped body 220a-220b has an internal diameter slightly greater than the part of peripheral wall 201bi, so that it can be constrained thereon in a rotatable way.
  • a purposely designed seat (not represented), in which the rotating member 220 can be engaged via snap action, with the possibility of rotation.
  • the rotating member 220 has at least two coupling elements 220c, in particular in the form of wings, preferably in opposite diametral positions, which project in a radial direction, preferably starting from the peripheral wall 220a.
  • radially projecting from the rotating member 220, in particular from its flange 220b if envisaged is a manually operable element, like a lever, designated by 220d.
  • the operable element 220d extends downwards (with reference to the dimension Y) substantially at its bottom dead centre, at an angular distance of approximately 90° with respect to each coupling element 220c.
  • the element 220d has a length and conformation such that it can be operated from the front of the dispenser 10 even when the removable dispenser part 100 is coupled on the fixed dispenser part 200 (see, for example, Figures 2 and 18).
  • the member 220 has one or more undercuts or recesses in order to prevent, in the course of its angular displacement, possible interference with one or more corresponding fixed elements of the main body part 201. These recesses can extend on the peripheral wall 220a and/or on the flange 220b.
  • 220e are two recesses, which are designed to be located at the formations 205 that extend from the part of peripheral wall 201bi of the main body 201.
  • the recesses 220e have an angular extension greater than that of the formations 205 and are arranged with respect thereto in order to enable angular movement of the rotating member 220.
  • a recess having a similar function, designated by 220f, is provided in the lower area of the rotating member 220, in particular to prevent interference of movement with a delivery outlet (see the elements designated by 219 and 403ci in Figure 11, described hereinafter), which extends beyond the outer surface of the part of peripheral wall 201bi of the main body 201 of the fixed dispenser part 200.
  • 220g designated finally by 220g is a recess that, in the operating condition of the dispenser 10, i.e., with the removable dispenser part 100 coupled on the fixed dispenser part 200, is aligned with the outlet end of the discharge recess 213 described previously, in order to enable outflow by gravity of a dose of washing agent delivered.
  • Exemplified in Figures 13 and 14 is the mode of operation of the coupling/uncoupling arrangement including the rotating member 220.
  • the coupling elements 220c of the rotating member 220 are engaged in the respective shaped seats defined in the peripheral surface 114b of the recess 114, in particular in their engagement area 117a (see also Figure 4): in this way, firm coupling between the removable dispenser part 100 and the fixed dispenser part 200 is guaranteed.
  • the seats referred to are shaped to obtain a coupling substantially of the bayonet type, and hence each have an engagement area 117a and a release area 117b (not visible in Figures 13-14 but represented in Figure 4) for the coupling elements 220c.
  • the movements for coupling and uncoupling the removable dispenser part and the fixed dispenser part occur in a substantially linear direction, in particular in the dimension of depth Z of the dispenser.
  • a coupling/uncoupling arrangement of the type exemplified is particularly advantageous in view of its simplicity.
  • the coupling/uncoupling arrangement operating between the parts 100 and 200 of the dispenser 10 may be different from the one exemplified, according to modalities that will appear clear to the person skilled in the field. It is pointed out, for example, that a mechanism with bayonet coupling could have an opposite configuration with respect to the one exemplified, i.e., with a rotating member functionally similar to the one designated by 220 that is mounted on the back of the movable dispenser body part 100 and with the respective coupling seats defined at the front of the fixed dispenser part.
  • FIG. 16 and 17 is a schematic cross-sectional illustration of just the hollow body 101.
  • the valve member 231 has a first portion 233 generally opposite to the spring 232, which extends axially through the corresponding tubular outlet part 112a or 113a and defines an actuation end 233a of the valve member 230.
  • the first portion 233 of the member 231 has a series of radial wings (not designated by any reference number, but clearly visible, for example, in Figure 6), in order to facilitate centring and/or guiding of the member itself within the corresponding tubular outlet, enabling, however, axial sliding thereof and passage of the washing agent.
  • the actuation end 233a of the valve member 231 projects beyond the proximal edge of the corresponding tubular outlet part 112a or 113a.
  • the member 231 of the non-return valve 230 2 has a second portion 236, which extends axially from the flange 234, in the direction opposite to the first portion 233, on which a part of the corresponding spring 232 can be conveniently fitted, and consequently guided, the second end of the spring preferably bearing upon the side of the flange opposite to the corresponding gasket 235.
  • the flange 234 of the member 231 defines, on its side opposite to the gasket 235, a seat - not indicated - received, and hence guided, in which is a part of the corresponding spring 232, the second end of the spring bearing upon the bottom of the seat.
  • valve 230i and 230 2 could also be built in a similar way.
  • the reason for the different embodiment is that the valve 230 2 is mounted in a deeper area (dimension Z) of the hollow body, i.e., of the tank R2, with the valve member 231 that is axially longer and for which it is thus advisable to envisage an axially extended portion 236 for guiding the spring 232.
  • the sealing means including the gasket 235 are spaced apart from the inner surface of the tank R1 or R2 that surrounds the mouth of the tubular outlet part 112a or 133a, thus enabling passage of the washing agent into the corresponding inlet 210 or 211 of the fixed dispenser part 200.
  • the contrast surface bearing upon which is the actuation end 233a of the valve member 231 is preferably defined within the corresponding inlet 210 or 211 of the fixed dispenser part 200.
  • this surface may be represented by the inner surface of a bottom of the inlet 210 or 211 (the bottom of the inlets 210 and 211 is visible in Figure 12, where it is designated by 210b and 211b, respectively), or else defined by a purposely provided element defined within the inlet 210 or the inlet 211: this second case is exemplified in Figure 18 for the non-return valve 230i, where extending within the inlet 210 is a contrast element 210c, bearing upon the front surface of which is the actuation end of the respective valve member, thus keeping it in the retracted position of opening of the outlet 112 or 113, in a compressed condition of the corresponding spring.
  • the removable dispenser part includes a first tank and a second tank for a first washing agent and a second washing agent, respectively, and the dispenser includes a first dispensing arrangement and a second delivery arrangement, each configured for dispensing dosed amounts of the respective first washing agent or second washing agent, respectively.
  • the first dispensing arrangement comprises a peristaltic pump, which has associated to it a command arrangement of the second dispensing arrangement, the peristaltic pump being configured to be driven in a first direction to cause dispensing of first dosed amounts of the first washing agent, and to be driven in a second direction to drive the command arrangement so as to cause dispensing of second dosed amounts of the second washing agent, in particular via the second dispensing arrangement.
  • a possible embodiment of such a peristaltic pump is visible, for example, in Figures 11, 12, and 18, in the latter figure the dispenser 10 being illustrated in an operating condition.
  • the intermediate portion of tube 403a is defined between a first portion of tube 403b, here defined as “ascending”, and a second portion of tube 403c here defined as “descending”, these two portions of tube 403b, 403c preferentially extending at least in part substantially parallel, in particular in the height dimension Y of the dispenser 10.
  • the delivery capacity o flow-rate of the pump 400, or the amount of washing agent delivered can be determined according to a technique in itself known, as a function of parameters such as the number of compression elements 402, the dimensions of the circumference according to which the elements are arranged, the section of passage of the deformable tube 403, the r.p.m. of the motor 404, and/or the number of revolutions of the motor 404.
  • the lower end of the ascending portion of tube 403b is coupled to a corresponding attachment 218 defined by the main body 201 of the fixed dispenser part 200, in particular within the housing 214, with the attachment 218 that is in fluid communication with the tubular inlet 210, via the opening designated by 218a, defined on the tubular wall of the aforesaid inlet (see, for example, also Figures 46 and 49).
  • the lower end of the descending portion of tube 403c defines, instead, a dispensing opening 219 for the first washing agent.
  • the portion of tube 403c passes through the peripheral wall 201bi of the main body 201, which is provided for this purpose with a corresponding recess, not indicated, with the stretch of tube 403ci projecting beyond the peripheral wall that is designed to be at least partially received in the recess 118a of the back of the hollow body 101 (see Figure 4).
  • the outlet 219 could also be defined by a tubular element associated or defined integrally by the main body 201 (like the attachment 218), connected to which is a lower end of the portion of tube 403c.
  • rotation of the assembly 401 causes pumping of the first washing agent through the tube 403, with the compression elements 402 that squeeze and release progressively consecutive stretches of the portion of tube 403a, with respect to the curved contact surface 214a.
  • the motor 404 has a drive shaft that is able to rotate according to an axis substantially parallel to an axis of rotation of the rotary assembly 401, there being provided one or more transmission members between the drive shaft and the rotating assembly.
  • the drive shaft of the motor 404 is partially visible in Figure 18, designated by 404a, with the corresponding axis of rotation designated by 404b, and designated by 401b in the same figure is a shaft of the rotating assembly 401, which identifies the respective axis of rotation thereof, designated by 401c.
  • the shaft 401b of the rotating assembly 401 is mounted passing through a corresponding opening defined on the bottom of the housing 214; at this opening, projecting from the bottom of the housing 214 towards the inside of the cavity C of the main body 201, is a corresponding cylindrical seat 214b, for supporting and guiding the shaft 401b.
  • a seal ring mounted in an intermediate stretch of the shaft 401b housed in the corresponding cylindrical seat 214b is a seal ring (not indicated).
  • the wheel 405 has a diameter, and hence a number of teeth, that is smaller than the diameter, and hence the number of teeth, of the wheel 406.
  • the pump 400 belongs to the arrangement for dispensing the first washing agent, which likewise includes a dispensing duct, which extends between the outlet of the corresponding tank R1 and the delivery outlet 219.
  • the dispensing duct is defined on the fixed dispenser part 200 and includes the inlet 210, the attachment 218, and the deformable tube 403.
  • the dispensing outlet of the duct could be defined by a tubular part of the main body 201, to which the outlet of the tube 403 is connected.
  • the dispensing arrangement for the second washing agent contained in the second tank i.e., the tank R2 includes a dosing valve, which is operative along the respective dispensing duct.
  • a dosing valve is designated as a whole by 410.
  • a possible embodiment of the dosing valve 410 is exemplified in Figure 19.
  • designated by 411 is a dosing chamber, defined by the main body 201 of the fixed dispenser part 200, partially housed in which in a linearly slidable way is a valve member designated as a whole by 412.
  • a portion of the valve member, designated by 412a extends always on the outside of the chamber 411, through a through hole of a front lid 41 la of the chamber itself.
  • the lid 41 la is preferably fixed at a front opening of the chamber 411 via screws (one of which is designated by 411b), with possible interposition of a seal gasket, but in possible variants (as may be seen, for example, in Figure 12), the screws may be absent and the lid directly welded at the aforesaid front opening.
  • the outer portion 412a of the member 412 is preferably provided with a widened head 412b, via which a pulling force can be imparted on the member itself.
  • a sealing element 413 Fitted on at least part of the portion of the member 412 that extends in the dosing chamber 411 is a sealing element 413 made of resilient material, for example, an elastomer.
  • the sealing element 413 includes a flange portion 413a, designed to provide a seal with respect to a valve seat 411 defined within the chamber 411.
  • An end portion 413b of the sealing element 413 coats, instead, the end of the member 412 opposite to the lid 411a in order to close in a sealed way an inlet 41 le of the dosing chamber 411.
  • This inlet is formed by a through opening of a wall that belongs to a lower hollow extension 411c of the rear part of the inlet 211 defined in the fixed dispenser part 200.
  • the sealing element 413 is likewise shaped to define a bellows portion 413c, at the end opposite to the portion 413b.
  • the bellows portion 413c has the purpose of providing a seal with respect to the inner side of the lid 411a (and thus prevent outlet of liquid from the opening of the lid 411 passing through which is the valve member), and at the same time enabling linear displacements of the valve member 412.
  • Housed within the bellows portion 413c is a spring (not visible), which tends to push the member 422 into a closed position of the valve seat 41 le.
  • the dosing chamber 411 likewise has an outlet 41 If, which is defined in a peripheral wall thereof and is in fluid communication with a corresponding duct 240 present on the main body 201 of the fixed dispenser part 200.
  • the outside of this duct 240 is partially visible in Figures 12 and 20 (see also Figure 71, where the duct 240 is partially sectioned), and preferentially comprises a part 240a defined integrally with the main body 201 and a corresponding lid 240b that is fixed in a fluid-tight way, for example, welded.
  • the duct 240 extends at least between the outlet 41 If of the dosing chamber of Figure 19 and the delivery passage 212 that opens on the front of the main body 201 ( Figure 11).
  • a part of the duct 240 extends also at the top as far as the outlet 41 le of the dosing chamber 411 to perform a venting function.
  • Figure 19 illustrates the aforesaid first position of the dosing valve 410, where the valve member 412 with the corresponding sealing element 413 is pushed by the corresponding spring - present within the bellows portion 413c - to close the inlet 41 le.
  • the chamber 411 is empty and that present in the inlet 211 and in the corresponding lower extension 211c - which are in direct fluid communication with the second tank R2, and more in particular with its intake volume R2a of Figures 6-8 - is the second washing liquid.
  • the flange portion 413a of the sealing element 413 is set at a distance from the corresponding valve seat 41 Id.
  • valve member 412 is made to recede countering the action of the corresponding bellows portion in such a way that the inlet 41 le of the chamber 411 is opened, and at the same time the flange portion 413a of the sealing element displaces towards the corresponding valve seat 41 Id. In this way, a certain amount of the second washing agent can penetrate into the dosing chamber 411.
  • the dose of the second washing agent consequently flows downwards along the duct 240, until it reaches the discharge passage 212 ( Figure 11), and hence the recess 213 and the recess 220g that enable passage thereof towards the inside of the washtub 3 of the dish-washing machine 1.
  • the delivery duct of the second delivery arrangement is defined on the fixed dispenser part 200 and includes the inlet 211, the extension 211c, the dosing chamber 411 of the valve 410, the duct 240, as well as - preferably - the recess 213 and the recess 220g.
  • the peristaltic pump or else at least one of its parts, is used to obtain delivery of both of the washing agents, and for this purpose the pump is of a reversible type; i.e., its actuator can be driven in a first direction to enable delivery of the first washing agent, and can be driven in a second, opposite, direction to enable delivery of the second washing agent, thanks to the command arrangement set between the pump and the second dispensing arrangement, which in the example includes the dosing valve 410.
  • the command arrangement can be driven by a corresponding rotating member associated to the pump, as in the example described hereinafter, or else the command arrangement can be shaped so as to be driven by, or comprise, one of the parts of the pump 400, for example, its rotating assembly 401 and/or one of its compression elements 402 and/or one of its transmission members set between the rotating assembly 401 and the motor 404.
  • the transmission lever could be driven by one of the parts of the peristaltic pump, such as its rotary assembly or one of its compression elements.
  • driving of the aforesaid dosing valve could be obtained by way of a member associated to the peristaltic pump, such as a cam member that defines a cam profile and that is able to be set in rotation by means by the actuator of the pump.
  • the cam member 420 is coaxial and fixed in rotation with respect to the rotary assembly 411 of the peristaltic pump 400, even though this does not constitute an essential characteristic.
  • the cam member 420 - visible in isolation in Figure 20 and in Figures 22, 24, 26, 28, and 30 - can be defined integrally by the gear wheel 406, or associated thereto, at the back thereof (see Figure 18).
  • Figures 21-30 The concept is exemplified in Figures 21-30.
  • Figures 21-22 exemplify a possible condition that precedes start of rotation of the motor 400 - i.e., of the corresponding shaft and of the gear wheel 405 associated thereto - in a clockwise direction, corresponding to which is a rotation in the counter-clockwise direction of the gear wheel 406, and hence of the cam member 420 associated thereto.
  • the transmission lever 430 is preferably made of substantially rigid polymeric material or plastic material. However, with a particular shape and type of the material, the lever itself could possibly be able to bend slightly in an elastic way and then return to its original shape.
  • the substantially rigid structure of the transmission lever 430 may be such as to enable the corresponding driving function, but can allow, if so required, slight elastic bending, for example, to compensate for dimensional tolerances which might cause mechanical interference.
  • the latter and/or the lever arm 430b
  • the lever arm 430b could be temporarily bent in an elastic way, in the case where the opposite end of the lever arm 430b were to be pressed on the lid 41 la of the valve 410.
  • the motor 404 of the pump is driven in a direction opposite to the previous one, i.e., in a counter-clockwise direction.
  • the cam- follower end of the lever arm 430a comes into contact with a rectilinear stretch of the cam profile 420a such as to induce an angular movement in the counter-clockwise direction of the transmission lever 430: the end of the lever arm 430b then comes back to resting on the widened head 412b of the valve member 412, without causing movement of the latter.
  • This condition is illustrated in Figures 25-26.
  • valve member 412 frees the inlet 41 le of the dosing chamber 411 ( Figure 19), enabling inflow into the chamber itself of a certain amount of the second washing agent, while the contact of the sealing flange 413a carried by the member 412 with the corresponding valve seat 41 Id prevents outflow of this amount of washing agent through the outlet 41 If of the dosing chamber 411 (see once again Figure 19).
  • the function of re balancing of the pressure inside the tank and/or of emptying the dispensing tube of a dispensing arrangement is obtained simultaneously with driving of another dispensing arrangement, in particular thereby enabling overall reduction of the times of activation of the pump, also with the advantage of a reduction in energy consumption.
  • the rotating assembly 401 of the pump 400 and in particular at least one element 402 thereof, is configured so as to keep a portion of the deformable tube 403 constantly compressed even when the pump 400 is inactive, in this way preventing risks of faults, such as an undesired passage of the washing agent WD.
  • This characteristic prevents, for example, any accidental emptying of the tank Rl and/or consequent washing anomalies due to the excess of agents WD accidentally poured into the washtub.
  • Continuous compression of the tube 403 also prevents the undesired inlet of air into the tank, which may prove useful for reducing the risks of degradation of the washing agent.
  • the actuator 404 of the pump 400 is hence preferentially a reversible electric motor, operation of which can be managed by means of a suitable circuit arrangement, for example, a control circuit or controller, in itself known, implemented on an electronic card mounted on the fixed dispenser part 200, in particular within the cavity C of its main body 201.
  • a suitable circuit arrangement for example, a control circuit or controller, in itself known, implemented on an electronic card mounted on the fixed dispenser part 200, in particular within the cavity C of its main body 201.
  • a suitable circuit arrangement for example, a control circuit or controller, in itself known, implemented on an electronic card mounted on the fixed dispenser part 200, in particular within the cavity C of its main body 201.
  • a suitable circuit arrangement for example, a control circuit or controller, in itself known, implemented on an electronic card mounted on the fixed dispenser part 200, in particular within the cavity C of its main body 201.
  • Such a card is, for example, designated by 250 in Figure 12, and may comprise a microcontroller 251.
  • the motor 404 may be
  • the controller or card 250 may include memory means, which may contain data and parameters for controlling the motor 404, for the purposes of dosing of the first washing agent, with rotation in the primary direction, and of the second washing agent, with rotation in the secondary direction.
  • the card 250 of the dispenser 10 may be provided with communication means in order to receive and/or transmit electrical signals from/to a controller of the control system CS of the dish-washing machine 1, for example, to receive data and parameters for controlling the motor 404, for the purposes of dosage of the washing agents, and/or to send electrical signals supplied by sensor devices on board the dispenser, and/or receive commands for other actuation devices on board the dispenser.
  • the circuit arrangement on board the dispenser could in any case include even just a wiring and/or electrical connectors, electrically connected to at least one actuation device and/or a sensor device on board the dispenser, for direct control of the dish-washing machine 1 by the control system CS.
  • the dispenser has a dispenser body, defined in which is at least one containment volume, which is able to contain a washing agent in liquid or semisolid form, as well as a dispensing arrangement, configured to dispense one or more dosed amounts of the washing agent, as well as a circuit arrangement, configured for connection to a control system of a dish washer on which the dispenser itself can be installed.
  • the dispenser further comprises at least one operable part, configured to be displaced manually by a user at least from a first position to a second position.
  • such an operable part may be represented by a plug or a hatch for opening or closing the inlet passage of a tank Rl, R2, or by a driving element 220 ( Figures 9-11) belonging to the coupling/uncoupling arrangement described above operating between the removable dispenser part 100 and the fixed dispenser part 200.
  • the dispenser further comprises a locking/unlocking arrangement, which includes a locking mechanism that can be driven by a corresponding electric actuator to assume at least one operative condition and at least one inoperative condition, in which the locking mechanism prevents or enables, respectively, displacement of the aforesaid operable part from its first position to its second position.
  • the aforementioned electric actuator is configured to be controllable as a function of an electrical signal supplied by at least one of a sensor device belonging to the circuit arrangement of the dispenser and the control system of the dish-washer on which the dispenser is installed, in order to cause passage of the locking mechanism from the at least one operative condition to the at least one inoperative condition.
  • the electrical signal used for managing the locking/unlocking arrangement may, for example, be a signal representing a level of the washing agent in the corresponding containment volume, supplied by a purposely provided sensor of the dispenser 10, or else representing a purposely provided command generated by the control system CS of the machine 1 (for example, a purposely provided key on the control panel of the dish washing machine for enabling or preventing removal of the dispenser part 100 from the dispenser part 200 via the coupling/uncoupling arrangement described above).
  • the at least one volume for containing the washing agent such as one of the tanks Rl, R2 has a loading passage
  • the aforesaid operable part may comprise a closing element associated to the loading passage.
  • This closing element may be a plug or else, as in the examples illustrated, a hatch associated to which is an latching/releasing device.
  • a possible embodiment of a locking/unlocking arrangement will now therefore be described with reference to a dispenser 10 according to various examples so far described, where the removable part 100 of the dispenser 10 includes two tanks R1 and R2, each having a loading passage 103 of its own provided with a corresponding hatch 104i and 104 2 , respectively, associated to which is a respective latching/releasing device 1051 and 105 2 .
  • respective level sensors for example, of the type described with reference to Figures 6-8, or of some other type (such as those described hereinafter).
  • the locking/unlocking arrangement includes a locking mechanism, which can be driven by the electric actuator designated by 450 in Figure 31, in particular a motor or an electromagnetic actuator, having an angularly movable drive shaft 450a, here set substantially according to the height dimension Y of the dispenser 10.
  • Designated by 451 is a cam member, which is designed to be set in rotation through the shaft 450a of the motor 450; for this purpose, the member 451 can be keyed to the aforesaid shaft 450a.
  • the cam member 451 defines a peripheral cam profile 452a-452b.
  • Designated by 4531 and 453 2 are a first mechanism member and a second mechanism member, each of which defines at an end thereof a corresponding cam- follower 453a.
  • the members 4531 and 453 2 will also be defined as “sliders”.
  • the two sliders 4531 and 453 2 are arranged with the respective cam-follower in opposed positions, corresponding to the cam profile 452a-452b.
  • the cam profile is defined by two opposite stretches that extend each according to a respective arc of circumference, the two circumferences being one larger than the other; for example, the stretch of a profile 452a may extend for more than 180° of a respective smaller circumference, whereas the stretch of a profile 452b may extend for less of 180° of a larger circumference.
  • the cam member 451 has at least one part of its peripheral cam profile that is suitable for bringing about displacement of at least one slider 453 io 453 2 , and at least one other part of the peripheral cam profile that is suitable for not bringing about displacements of the sliders 4531 and 453 2 .
  • the cam member 451 could hence also be of a lobed type, for example, with three similar lobes, two of which opposite to one another and the third at 90° with respect to each of the others.
  • Each slider 453 1 and 453 2 is urged by a corresponding elastic element, such as a helical spring 454 (see Figures 33 and 35), towards the member 450 so that each cam- follower 453a is constantly in contact with the cam profile 452a-452b in the course of rotation of the member 450.
  • each slider 453 1 and 453 2 is constrained to carry out linear displacements, here according to the width dimension X of the dispenser 10; for this purpose, provided in the main body 201 of the fixed dispenser part 200 are suitable guiding supports (not indicated).
  • Each slider may be made up of a number of parts.
  • the slider 453 1 is made up of two parts coupled together, designated by 453 i and 453 i b only in Figure 31, where the part 453 i a has a structure similar to that of the slider 453 2 and the part 453i b , which defines the corresponding cam-follower 453a, is conveniently shaped so as to be able to slide without finding any hindrance in other components of the removable dispenser part (such as the motor of the peristaltic pump described previously).
  • the locking mechanism further comprises a locking member, configured to interact with a respective movable member of the latching/releasing device 105 1 or 105 2 of a corresponding hatch 104i or 104 2 .
  • a locking member configured to interact with a respective movable member of the latching/releasing device 105 1 or 105 2 of a corresponding hatch 104i or 104 2 .
  • the locking members 206i and 2O6 2 hence preferably extend in the height dimension Y of the dispenser 10, i.e., in a direction substantially perpendicular to the direction of displacement of the sliders 453 1 and 453 2 .
  • each blocking member 206i and 2O6 2 is displaceable between a blocking position and an unblocking position, with respect the respective movable member, here represented by the latching/releasing device 105 1 and 105 2 that are manually operable.
  • each latching/releasing device 105 1 and 105 2 basically consists of a lever member that can be turned through an angle about a respective fulcrum or axis 105c and that defines a first lever arm 105e and a second lever arm 105d, the second lever arm defining or having associated to it a respective element that is operable by a user.
  • each locking member 206i and 200 2 has an end - designated by 206a in the figures - configured to interact with an end portion of a respective first lever arm 105e, to prevent or enable, respectively, an angular movement of the lever member that forms the latching/releasing device 105 1 and 105 2.
  • the aforesaid end 206a of the locking member 206 1 or 2O6 2 is an upper end.
  • each locking member 206 1 and 2O6 2 is mounted so that it can turn about the respective longitudinal axis.
  • each member 206i and 2O6 2 is constrained in a rotatable way in a through seat defined in the respective positioning and/or guiding formation 205, with its upper end portion 206a and its lower end portion that project at the two ends of the formation 205.
  • the locking mechanism in order to obtain rotation of the locking member, includes a transmission comprising toothed parts meshing with one another, preferably for a transmission of a pinion-rack type.
  • each member 206i and 2O6 2 includes a respective toothing that extends according to a circumference or a part thereof and that meshes with a corresponding toothing of a respective slider 453 1 or 453 2 .
  • the lower end portion of each locking member 206 1 and 2O6 2 has a respective gear wheel 206b that meshes with a lateral toothing 453b of the respective slider 453 1 or 453 2 , substantially with a transmission of a pinion-rack type.
  • a linear displacement of each slider 453 1 or 453 2 causes rotation of the respective locking member 206 1 and 2O6 2 about the respective longitudinal axis.
  • each locking member 206i and 2O6 2 designed to interact with the respective first lever arm 105e of the corresponding latching/releasing device 105 1 or 105 2 , has a substantially semi- cylindrical profile, with the locking member that presents an angular travel between the blocking position and the unblocking position of approximately 90°.
  • each locking member 206i and 2O6 2 is to be understood as being provided merely by way of preferential example in so far as the end portion could also have a profile having the shape of a circular sector with an extension of less than 180° (for example, an extension of just 90°), without prejudice to the lunctions described hereinafter.
  • the locking/unlocking arrangement is illustrated in a condition such that opening of both of the hatches 104i and 104 2 is prevented; i.e., switching of both of the latching/releasing devices 105 1 and 105 2 is prevented.
  • the cam member 451 in this condition the cam member 451 is in an angular position such that both sliders 453 1 and 453 2 are held by the member itself in the respective retracted conditions, with a maximum compression of the corresponding springs 454.
  • the simultaneous retracted position is determined by the fact that the cam- followers 453a of both of the sliders 453 1 and 453 2 interact with one and the same stretch of the cam profile, namely its more extensive stretch 452a of smaller radius.
  • the condition illustrated is obtained via appropriate positioning of the shaft 450a of the electric motor 450, which may, for example, be a stepper motor, or else a different motor, possibly provided with a position sensor, such as a sensor of an encoder or resolver type.
  • the circuit or card 250 may comprise a circuit for control of the motor 405 and/or a circuit for control of the corresponding position sensor.
  • Control of the motor 405, i.e., of the cam member 451, in the position illustrated in Figures 31-32 is preferably determined by the electrical signal supplied by sensors that equip the two tanks R1 and R2, in particular the level sensors. More in particular, in the specific case illustrated, these signals will be indicative of the presence within both of the tanks R1 and R2 of an amount of washing agent that exceeds a pre-set minimum level, or a level indicating the need to top up the tank.
  • FIGS 33-34 the locking/unlocking arrangement is illustrated in a condition such that opening of the hatch 104 2 is prevented and opening of the hatch 104i is, instead, enabled; i.e., switching of the latching/releasing device 105 2 is prevented and switching of the latching/releasing device 105 1 is enabled.
  • This condition arises when the amount of washing agent contained in the tank R1 drops below the pre-set minimum level, with the signal supplied by the corresponding level sensor that represents this condition. Assume that, at the same time, the amount of washing agent contained in the tank R2 exceeds, instead, the corresponding minimum topping-up level, and that the corresponding level sensor supplies a corresponding signal.
  • the cam member 451 in this condition the cam member 451 is in an angular position such that the slider 453 2 is held by the member itself in the respective retracted condition, with a maximum compression of the corresponding spring 454. Instead, the slider 453 1 is pushed by the action of the corresponding spring 454 into a respective advanced condition.
  • These different positions are determined by the fact that the cam-followers of the two sliders interact with different stretches of the cam profile: in particular, the cam-follower 453a of the slider 453 2 interacts with the stretch of profile 452a that is more extensive and of smaller radius, whereas the cam-follower 453a of the slider 453 1 interacts with the stretch of a profile 452b that is less extensive an of greater radius.
  • the condition illustrated is obtained via appropriate positioning of the shaft 405a of the electric motor 450, as a function of the signal supplied by the level sensors that equip the two tanks R1 and R2.
  • the signal of the sensor that equips the tank R2 will be indicative of the presence within the tank itself of an amount of washing agent that exceeds the corresponding pre-set minimum level
  • the signal of the sensor that equips the tank R1 will be indicative the presence inside the tank itself of an amount of washing agent lower than the corresponding pre-set minimum level.
  • the hatch 104i of the tank R1 can thus be opened by acting on the latching/releasing device 105 1 and topping-up with the corresponding washing agent can be carried out.
  • FIGs 35-36 the locking/unlocking arrangement is illustrated in a condition opposite to the one illustrated in Figures 33-34, i.e., such that opening of the hatch 104i is prevented and opening of the hatch 104 2 is, instead, enabled, i.e., a condition in which the amounts of washing agents contained in the tanks R1 and R2 are above and below, respectively, the corresponding pre-set minimum levels, as indicated by the signals supplied by the corresponding level sensors.
  • the cam member 451 is in an angular position opposite to that of Figures 33-34, with the sliders 453 1 and 453 2 held in the retracted condition and in the advanced condition, respectively.
  • Corresponding to this position of the sliders 453 1 and 453 2 is an angular position of the locking members 206i and 2O6 2 such that the upper end 206a of the member 206i is set with its semi- cylindrical portion that extends underneath the end area of the lever arm 105e of the engagement/release device 105i, whereas the upper end 206a of the member 2O6 2 is set with its semi-cylindrical portion that is staggered with respect to the end area of the lever arm 105e of the engagement/release device 105 2 .
  • the device 105 1 cannot be operated manually, whereas the device 105 2 can be operated manually to enable opening of the corresponding hatch 104 2 .
  • this condition illustrated can be obtained via appropriate positioning of the shaft 450a of the electric motor 450 as a limction of the electrical signal supplied by the level sensors.
  • the signal of the sensor that equips the tank R1 will be indicative of the presence within the tank itself of an amount of liquid that exceeds the corresponding pre-set minimum level
  • the signal of the sensor that equips the tank R2 will be indicative of the presence within the tank itself of an amount of liquid lower than the corresponding pre-set minimum level.
  • the hatch 104 2 of the tank R2 can thus be opened by acting on the latching/releasing device 105 2 and topping- up with the corresponding washing agent can be carried out.
  • the closing element that equips the loading passage of a tank i.e., the part that can be operated with which the locking/unlocking arrangement interacts
  • the locking/unlocking arrangement could be of a conception similar to the one described above: for example, a latching/releasing system similar to one of those designated by 105 1 and 105 2 may be provided, where an latching element of the type designated by 105b in Figure 3 is configured to interact with the plug (for example, partially sliding over it or penetrating into a peripheral seat or toothing thereof) in order to prevent rotation or removal thereof.
  • the dispenser comprises a fixed dispenser part and a removable dispenser part, which is couplable in a removable way to the fixed dispenser part and defines at least one tank for a washing agent.
  • the dispenser may also comprise a signalling arrangement, which includes at least one emitter device mounted on the fixed dispenser part, which is able to emit visible radiation and includes a light source, as well as at least one light- guide element configured to transfer the visible radiation emitted by the emitter device towards an area of the dispenser designed to face inside the washing chamber, the at least one light-guide element being on the removable dispenser part and being optically coupled in a separable way to the emitter device mounted on the fixed dispenser part.
  • the light-guide element extends between a front and a back of the removable dispenser part, very preferably within a corresponding passage or mounting seat defined in the hollow body.
  • the dispenser may comprise at least one sensor device, configured to supply an electrical signal representing at least one condition of the content of the at least one tank, such as a level thereof or, as described also hereinafter, a characteristic different from the level thereof, in particular a qualitative characteristic thereof, such as a chemico-physical characteristic or a characteristic linked to its composition and/or type.
  • the signalling arrangement may be controllable as a function of the electrical signal supplied by the at least one sensor device.
  • the signalling arrangement may belong to a circuit arrangement of the dispenser, which is configured for connection with a control system of a dish-washer on which the dispenser itself can be installed: in these cases, the circuit arrangement on board the dispenser may be configured to enable control of the signalling arrangement as a function of an electrical signal supplied by the aforesaid control system of the dish washer.
  • a possible embodiment of the aforesaid signalling arrangement will be described with reference to a dispenser 10 according to various examples described so far, where the removable part 100 of the dispenser 10 includes two tanks R1 and R2, associated to which are respective level sensors, for example, of the type described with reference to Figures 6-8, or of some other type (for example, of the types described hereinafter).
  • each emitter device comprises a respective light source, designated by 260, for example, a source of a LED type.
  • the light source 260 may, for example, be mounted on a control card of the dispenser, such as the electronic card designated previously by 205.
  • each emitter device may also comprise a respective light-transmitting element on the fixed dispenser part 200, such as the elements already designated previously by 207, for example, in Figure 11.
  • each light-transmitting element 207 may be mounted in a respective housing defined in the positioning and/or guiding formations 205.
  • Each element 207 may be made of any material suitable for transmission of light, for example, polycarbonate.
  • such a light-transmitting element 207 may extend axially according to the height dimension (Y) of the dispenser 10, above the light source 260.
  • the light-transmitting element has an entry end 207a facing the light source 260 and an exit end 207b, through which the emitter device - here constituted by the source 260 and by the element 207 - emits visible radiation.
  • the signalling arrangement includes a first light-guide element, designated as a whole by 261 in Figure 37 (see also Figures 3 and 5), which is configured to transfer the visible radiation emitted by the emitter device 260, 207 towards the front area of the dispenser 10 designed to face the inside of the washtub 3 of the dish-washing machine 1.
  • each element 261 may be made of any material suitable for transmission of light, for example, polycarbonate.
  • the light-guide elements 261 are preferentially mounted in the upper portion 101a ( Figures 3 and 5) of the hollow body 101.
  • Each first light-guide element 261 is mounted on the removable dispenser part 100, and in particular on its hollow body 101.
  • a corresponding through mounting seat preferably substantially cylindrical, which extends between the front and the back of the hollow body 101.
  • a seat is designated by 262a-262b in Figure 37.
  • the hollow body 101 is formed by the union of at least one front piece and one rear piece (see, for example, Figure 3, where these pieces are designated by 1011 and IOI2): it should consequently be assumed that the seat part 262a is defined in the aforesaid front piece, whereas the seat part 262b is defined in the aforesaid rear piece.
  • the seat parts 262a are visible also in Figures 6-8.
  • each first light-guide element 261 is designed to be optically coupled in a separable way with respect to the emitter device 260, 207.
  • the exit end 207b of each light-transmitting element 207 faces the entry end 261a of the corresponding light-guide element 261, preferably at a certain distance therefrom.
  • the exit end 261b of the light-guide element 261 faces frontally towards the outside of the corresponding mounting seat 262a-262b, preferably but not necessarily substantially flush with a front surface of the removable dispenser part 100, i.e., of its hollow body 101.
  • the entry end 261a of the first light-guide element 261 is preferably an inclined surface in the case where the axis of emission of the emitter device extends in a direction transverse with respect to the axis of the light-guide element.
  • the emitter 260, 207 has an axis of emission that extends as a whole substantially vertically, whereas the light-guide element 261 substantially extends horizontally between its entry end and its exit end: for such a case, the exit end 207b of the element 207 may be substantially plane, and the entry end 261a of the element 261 may have an inclination of approximately 45°.
  • the transmission element 207 were to extend further up than the case represented in the figures, and the light-guide element 261 were at the same time shorter than what is represented, a reverse configuration would be possible, i.e., with the exit end 207b of the element 207 inclined and the entry end 261a of the element 261 substantially plane.
  • the exit end 207b and the entry end 261a could also both be inclined.
  • at least one of the entry end 261a and the exit end 207b is shaped to enable optical coupling between the element 261 and the element 207.
  • each light-guide element 261 is optically coupled in a separable way with respect to the emitter device 260, 207 enables free removal of the removable dispenser part 100 from the fixed dispenser part 200, ensuring, instead, an efficient and precise transmission of light indications when the two parts in question are, instead, coupled together.
  • management of the light source 260 of the emitter device can be carried out by a controller that equips the dispenser 10, such as the card 250 referred to previously, as a function of the signals supplied by the level sensor and/or quality sensor that equips each tank R1 and/or R2, or else can be carried out by the control system CS of the dish-washing machine 1.
  • the source 260 of the emitter device may be controllable for emission of radiation at different frequencies and/or different intensities, and hence with different colours and/or different light intensities in order to supply indications of a diversified type according to the information that is to be made available to a user of the dish-washing machine.
  • emission of a green light could be understood as meaning the presence of an amount of washing agent greater than a pre-set minimum level and/or the presence of a proper washing agent in the tank (in the case where the sensor that equips the tank is able to detect the quality and/or type of washing agent), emission of a yellow light could be understood as meaning the need to top up with the washing agent, and emission of a red light could be understood as meaning the presence within the tank of a wrong washing agent and/or a washing agent that is contaminated (consider the case where a user fills or tops up the tank R1 dedicated for a washing detergent with a rinsing additive).
  • lights of the same colour that vary in intensity, for example, with more or less intense lights or flashing lights, or else that alternatively increase and decrease the light intensity.
  • one and the same signalling arrangement may be used for carrying information of a different type, via at least two different signalling modes (colours/flashing).
  • the signalling arrangement that equips the dispenser comprises at least one second light-guide element, preferably located at a front of the removable dispenser part, with the second light-guide element that is optically coupled to the at least one first light-guide element and is configured to diffuse the visible radiation received by the at least one first light-guide element.
  • FIG. 39-44 An embodiment of this sort is illustrated in Figures 39-44 for a dispenser 10, the removable part 100 of which is provided with at least one hatch, in particular two hatches 104i and 104 2 .
  • reception seats 103c Figure 40
  • the aforesaid second light-guide element designed for diffusion of visible radiation designated as a whole by 263 is at least partially set within an aforesaid seat 103c and preferentially extends along at least part of a perimetral area of the seat itself that is not occupied by the hatch.
  • the second light-guide element may be at least in part set underneath a corresponding hatch 104i, 104 2 , with the latter made at least in part of transparent material and/or provided with an opening designed to enable vision of the optical signal.
  • the light-guide elements could also be set in positions different from the ones exemplified, such as a position in any case close to a charging opening of a tank, for example, located in the proximity or alongside a seat of the type designated by 103c and/or of a hatch of the type designated by 104i or 104 2 , or again alongside a plug that closes a charging opening.
  • the second light-guide element 263 hence extends at least in part in a gap existing between lateral facing surfaces of the seat 103c and of the hatch 104i or 104 2 so as to have at least one respective surface directly exposed, even when the hatch is in the closed position within the corresponding seat. It will consequently be appreciated that in embodiments of this sort it is not necessary for the exit end of each first guide element 260 to be directly visible at the front of the removable dispenser part 100, as, instead, in the case represented in Figures 3 and 5.
  • the second light-guide element 263 extends along a number of contiguous sides of the seat 103c and hatch 104i or 104 2 , for example, in the form of a frame.
  • the shape chosen may vary widely with respect to the one exemplified, also according to the position chosen for the second light-guide element 263 (for example, U-shaped, L-shaped, circular, semicircular, polygonal, etc.).
  • Figure 42 illustrates the case of an element 263 shaped like a frame with four sides, including two upright parts 236a and two transverse parts 263b, which are relatively thin to define a substantially quadrangular shape.
  • a frame element 263 is mounted in a fixed position (for example, glued, or engaged, or welded, or interference inserted, or fixed via riveting of parts), within a seat 103c, with the upright parts 263a set up against corresponding lateral surfaces of the seat 103c; preferably, the upright parts 263a have an exposed surface, between the upper portion 101a of the hollow body 101 and the corresponding hatch 104i or 104 2 .
  • the upper transverse part 263b is at the upper end of the seat 103c, set up against its bottom, in any case with an exposed surface at the upper edge of the hollow body 101.
  • the lower transverse part 263b is, instead, at the lower end of the seat 103c, set up against its bottom, which is also with its lower surface possibly exposed between the seat 103c and the hatch 104i or 104 2 , at the step D ( Figure 41) defined between the upper and lower portions 101a, 101b of the hollow body 101.
  • its regions of connection with the upright parts 263a have a suitable shaping 263c to prevent interference with the lower hinging means of the hatch 104i or 104 2 .
  • the first light- guide element 261 may be shorter than in the case illustrated to Figure 37, and it is preferable for its exit end 261b to be inclined in order to direct visible radiation at output into the second light-guide element 263. From Figures 43-44 it may moreover be noted how, in embodiments of this sort, the mounting seat 262a-262b of the first light- guide element 261 may be closed at the front by a corresponding portion of the front wall of the hollow body 101.
  • an internal passage 120 is defined, which enables at least part of the exit end 261b of the first light-guide element 261 to face a corresponding portion (here belonging to an upright part 263a) of the second light-guide element.
  • the first light-guide element 261 and the second light- guide element 263 substantially extend in a direction transverse with respect to one another, as in the case exemplified in Figure 44.
  • the exit end 261b of the first element 261 it is preferable for the exit end 261b of the first element 261 to be inclined, for example, with an inclination of approximately 45°.
  • the first light-guide element 261 will have an outlet end 261b at least partially facing a corresponding portion of the second light- guide element 263, the exit end 261a being in any case shaped to enable an optical coupling between the elements 261 and 263.
  • the two light-guide elements 261 and 263 could, however, also be rendered fixed with respect to one another (for example, engaged via snap action) or made of a single piece.
  • the light emitted by the source 206 impinges on the entry end 207a of the transmission element 207, then coming out of the corresponding exit end 207b to impinge upon the entry end 261a of the first light-guide element 261a.
  • the visible radiation is then directed from the exit end 261b of the first light-guide element 261 towards the second light-guide element 263, thanks to the presence of the internal passage 120 (Figure 44).
  • the radiation preferably a light radiation having a variable colour or intensity, is then propagated within the second element 263 and diffused along at least part of the perimeter of the seat 103c ( Figure 40), i.e., of the hatch 104i or 104 2 in order to be perceivable at the front of the removable dispenser part.
  • the emitter device set on the fixed dispenser part 200 does not necessarily have to include a light-transmitting element of the type designated by 207, in particular if the light source 260 is mounted on the aforesaid fixed part directly facing the entry end 261a of the first light-guide element 261.
  • the light-guide configurations exemplified may be used for highlighting in a clear way possible fault conditions, such as a tank in which the wrong washing agent or a contaminated washing agent has been introduced, in such a way that the user can intervene in a timely way, for example, by removing the tank in question and washing it.
  • the dispenser includes at least one tank, preferentially operatively associated to which is a level sensor; in addition or an alternative, in various preferential embodiments, there may be operatively associated to the at least one tank a sensor for detecting at least one characteristic of the substance contained in the tank other than the level, and in particular a qualitative characteristic thereof.
  • a sensor for detecting at least one characteristic of the substance contained in the tank other than the level, and in particular a qualitative characteristic thereof.
  • by “qualitative characteristic” is meant a characteristic or property linked to the type or composition of the substance, such as a chemical or physical or electrical characteristic. Detection of a qualitative characteristic may prove useful for the purposes of recognition of the type of substance, or of a possible contamination thereof or mixing thereof with another substance, or a possible deterioration thereof. This detection may, for example, enable limitation of possible risks that could derive from incorrect operations carried out by a user when topping up a tank, which could result in damage to the dispenser or in damage to the dish-washer, or in a poor washing result
  • a quality sensor proves, for example, useful for recognising whether the substance contained in the tank is the right one, i.e., whether it corresponds to the one to which the tank in question is effectively dedicated.
  • a liquid rinsing additive (brightener) into a tank dedicated, instead, for a liquid washing detergent: the possible subsequent starting of a dish-washing program in this condition would entail extremely negative effects, both in terms of low washing efficiency and in terms of an abundant production of foam, which is difficult to eliminate, within the tub 3, which could even jeopardise operation of the dish-washing machine 1 (the foam could infiltrate into ventilation ducts, until it penetrates into the door of the dish-washing machine, where the foam formed by an electrically conductive liquid - as is a brightener - could create short-circuits between electrical components of the dish-washing machine, or else this foam could come out into the domestic environment.
  • the signal supplied by a quality sensor of the type referred to can be conveniently used by a circuit arrangement of the dispenser or of the dish-washing machine to provide a suitable indication for the user (obviously with the machine supplied electrically), such as a warning of an audible type (for example, via a buzzer) and/or a warning of a visual type (for example, using a light warning system of the types exemplified previously).
  • the quality-sensor device comprises a sensing element having at least two electrodes, prearranged for being in contact with the respective washing agent, and a circuit arrangement configured to measure the value of at least one electrical quantity between the at least two electrodes.
  • the circuit arrangement implemented on board the dispenser or in the control system of the machine, is configured to compare the value of the at least one electrical quantity measured with at least one respective reference value, and consequently generate information representing a qualitative characteristic of the washing agent.
  • a sensor may possibly be pre-arranged to obtain also a measurement of level, as will be exemplified hereinafter.
  • Figures 45-46 are partial views, respectively a front view and a sectioned perspective view, of a lower area of the fixed dispenser part 200, and in particular of its main body 201.
  • Figures 45-46 are partial views, respectively a front view and a sectioned perspective view, of a lower area of the fixed dispenser part 200, and in particular of its main body 201.
  • Figures 45-46 are partial views, respectively a front view and a sectioned perspective view, of a lower area of the fixed dispenser part 200, and in particular of its main body 201.
  • Figures 45-46 are partial views, respectively a front view and a sectioned perspective view, of a lower area of the fixed dispenser part 200, and in particular of its main body 201.
  • the inlet 210 preferably comprises at least one cylindrical tubular portion, to enable coupling of the corresponding tubular outlet 112 of the tank R1 (see, for example, Figure 4).
  • the inlet 210 is filled with the washing agent coming from the tank Rl.
  • Visible in Figure 46 are the aforesaid cylindrical tubular portion, designated by 210a, as well as a corresponding bottom wall 210b (see also Figure 12).
  • positioned at the inlet 210 is the sensing element 270 of a sensor device configured for detection of at least one qualitative characteristic of the washing agent coming from the tank Rl.
  • the sensing element 270 comprises at least two electrodes 270i and 270 2 , which project into the volume of the inlet 210.
  • the electrodes are preferably made of metal and designed to come into direct contact with the washing agent, for example, when the electrical quantity being detected is the impedance or the conductivity or the capacitance.
  • the at least two electrodes 270i and 270 2 each have a respective axis that substantially extends in the depth dimension Z of the dispenser 10; in these embodiments, the electrodes substantially extend parallel to one another.
  • the axes of the at least two electrodes are preferentially at a distance comprised between 2 and 20 mm from one another, preferably comprised between 3 and 7 mm.
  • the sensing element 270 comprises two electrodes 270i and 270 2 substantially at one and the same height, with reference to the height dimension Y of the dispenser 10.
  • the length and the position the electrodes 270i and 270 2 is such that they occupy in depth (dimension Z) only a part of the inlet 210 in order not to constitute a hindrance to insertion in the inlet itself of the tubular portion (112a, Figure 4) that forms the corresponding outlet of the tank Rl, provided on the back of the removable dispenser part 100.
  • the electrodes 270i and 270 2 are driven in a fluid-tight way into respective through holes provided in the bottom 210b of the inlet, and have for this purpose an abutment flange 271, which can also possibly perform sealing functions.
  • the electrodes 270i and 270 2 could be provided with respective seal rings. Instead of driving, fixing between the body of the dispenser and the electrodes could be obtained by overmoulding the former on the latter.
  • the electrodes 270i and 270 2 could comprise an electrically conductive polymer, such as a polymer with electrically conductive fillers, for example powders or metal fibres and/or containing carbon fibres.
  • the electrodes 270i and 270 2 could also have a shape different from the one exemplified. Possibly, the electrodes could be isolated from the liquid substance, for example, coated with a layer of electrically insulating material, if they are designed for measurement of an electrical quantity that does not imply a direct contact with the substance, for example, a measurement of capacitance: in such a case, it is sufficient for the coated electrodes to be arranged so that they can at least partially be immersed in the substance.
  • the sensing element could be configured like a stand alone module, coupled in a sealed way to the rear part of the inlet, for this purpose provided with a suitable mounting opening (variants of this sort will be described hereinafter).
  • the part of the electrodes 270i and 270 2 that projects at the rear from the inlet 210 can be at least partially surrounded by shaped formations 210c, preferably cylindrical, for example, to define an electrical connector used for connection of the sensing element 270 to the circuit arrangement on board the dispenser 10 or to the control system CS of the dish-washer.
  • the value of the electrical quantity measured between the electrodes 270i and 270 2 of the sensing element 270 is used by the circuit arrangement of the dispenser 10 or by the control system CS of the dish-washing machine 1 for assessing the correctness or quality of the substance present at the inlet 210 or else of the washing agent contained in the corresponding tank.
  • the aforesaid circuit arrangement of the dispenser or of the control system CS of the machine 1 preferentially includes memory means, stored in which are values or ranges of reference values (for example, in tabulated form) of the electrical quantity in question, representing those washing agents that are considered correct for the specific tank, here the tank Rl.
  • the circuit arrangement hence compares the value of the quantity detected via the sensing element 270 with the reference values stored, and consequently controls generation of a suitable audible and/or visual warning, as mentioned previously.
  • the warning system is not activated, or is activated in a first mode (for example, a short intermittent sound or a green light); in the opposite case, the warning system is activated, or is activated in a second mode (for example, a continuous sound or a red light).
  • the aforesaid circuit arrangement may, for example, be implemented in the card previously designated by 250, including the microcontroller 251, or else be implemented in the control system CS of the dish washing machine 1.
  • the electrical quantity detected between the at least two electrodes 2701 and 270 2 of the sensing element 270 is the impedance.
  • the dispenser includes a fixed dispenser part and a removable dispenser part, the latter comprising a hollow body that defines at least one tank, where at least one first wall of the hollow body is designed to face at least partially at least one second wall of the fixed dispenser part, and the dispenser comprises at least one sensor device, configured to supply an electrical signal representing at least one of a level and a qualitative characteristic of the content of the at least one tank.
  • the at least one sensor device is arranged at least in part on the fixed dispenser part. In preferential embodiments, the sensor device is entirely arranged on the fixed dispenser part.
  • the at least one tank has, preferably in a lower part thereof, an outlet in a wall of the hollow body, which can be coupled in a separable way to a respective inlet present in a wall of the fixed dispenser part: in particularly advantageous embodiments, the sensor device is arranged substantially at the inlet, or in a corresponding housing in fluid communication with the inlet.
  • the sensing element 270 does not necessarily have to be mounted at the inlet 210, it being possible for it to be set in fact at least partially in a corresponding housing separate from the inlet 210, for example, a purposely provided a chamber defined by the main body
  • the preferential version with at least one sensor device set on the fixed dispenser part makes it possible to facilitate and/or guarantee reliability of the corresponding electrical connections in so far as a fixed electrical connection is provided (for example, a wiring) between the dish-washer and the fixed dispenser part, albeit enabling detection of the content of the removable dispenser part, i.e., the content of the at least one tank R1 or R2. It is also clear that the concept of mounting of the entire sensor on the fixed dispenser part also applies as regards the already mentioned possibility of mounting a sensing element 270 at the inlet 211, for example, at the back of its tubular part 211c, 211c (see, for example, Figure 47).
  • the solution of providing a sensing element with at least two electrodes, which are designed to be at least partially immersed in the washing agent, can be advantageously used also for the purposes of production of a level sensor.
  • FIG. 47 An embodiment of this sort is exemplified in Figure 47 as regards installation of a sensing element 270 at the inlet 211 for the contents of the tank designated previously by R2.
  • a similar sensing element could be mounted at the inlet 210 for the contents of the tank designated previously by Rl.
  • the sensing element 270 includes two electrodes 270i and 270 3, arranged at the bottom 211b of the inlet 210 and of the corresponding lower extension 211c, already described previously, these electrodes being at different heights, with reference to the height dimension (Y) of the dispenser 10.
  • the electrodes 270i and 270 3 can be built in a way similar to the electrodes already described above, and hence be made, for example, of metal material or other electrically conductive material (possibly coated with an insulator, for example, in the case of capacitive measurement) and each have a respective axis that substantially extends in the depth dimension (Z) of the dispenser 10, preferably parallel to one another and at a distance indicatively comprised between 3 and 7 mm.
  • each electrode 270i and/or 270 3 that extends into the inlet 211 will have a length and a position such as not to constitute a hindrance to insertion of the tubular outlet 113 of the corresponding tank R2 (see Figure 4).
  • the value of the electrical quantity measured between the electrodes 270i and 270 3 of the sensing element 270 is used by a circuit arrangement of the dispenser 10 or of the dish-washing machine 1 for assessing the level of the washing agent present in the inlet 211, which represents a level of the washing agent contained also in the corresponding tank R2, in particular a threshold level.
  • the aforesaid circuit arrangement can hence include memory means, stored in which is at least one reference value of the electrical quantity in question, for example, a value representing the simultaneous contact of both of the electrodes 270i and 270 3 with the washing agent in question (or, more in general, with a liquid or semisolid substance).
  • the value representing the simultaneous contact of both of the electrodes 270i and 270 3 with the washing agent could hence indicate, for example, a level of the washing agent that exceeds a minimum value.
  • the circuit arrangement hence compares the value of the quantity detected via the electrodes 270i and 270 3 of the sensing element 270 with the at least one reference value stored. It will be appreciated that, when both of the electrodes 270i and 270 3 are in contact with the washing agent, the electrical quantity measured will have a first value; instead, when the level of the washing agent within the inlet 211 and the corresponding bottom extension 211c is at a lower height than the electrode 270 3 or comprised between the two electrodes 270i and 270 3 (i.e., with the upper electrode 270 3 in air), or else with both of the electrodes 2701 and 270 3 in air, the electrical quantity measured will have a second value, clearly distinguishable from the first value.
  • This condition of intermediate level between the two electrodes, hence lower than the upper electrode, can be considered as representing a low level of the washing agent in the tank R2 (given that the outlet 113 is located in the lower area of the tank R2), and consequently of the need to proceed to topping-up.
  • the lowest point of the electrode 270 3 with reference to the height dimension (Y) identifies a minimum level of the washing agent, below which it will be necessary to carry out topping-up with the washing agent.
  • the control arrangement On the basis of the comparison may between the measured value and the at least one reference value, the control arrangement will accordingly control generation of a suitable audible and/or visual warning, like the one already mentioned previously.
  • the electrical quantity detected between the at least two electrodes 270i and 270 3 of the sensitive element 270 may be the impedance, or the conductivity, or the capacitance.
  • level sensor described with reference to Figure 47 can be used as an alternative to the float-type level sensor described previously with reference to Figures 6-8. Otherwise, such a float-type level sensor can be used in combination with a quality sensor of the type described with reference to Figures 45-46.
  • the dispenser comprises a body, defined in which is at least one tank, which is able to contain a corresponding washing agent in liquid or semisolid form, and at least one sensor device, configured to provide information representative of at least one of a level and a qualitative characteristic of the washing agent.
  • the sensor device comprises a sensing element that includes at least two electrodes, prearranged for being in contact with the washing agent, and a circuit arrangement, which is configured to measure a value of at least one electrical quantity between the at least two electrodes and compare the value of the at least one electrical quantity measured with at least one respective reference value in order to generate information representative of at least one of a level and a qualitative characteristic of the washing agent.
  • the sensing element of the sensor device includes at least three electrodes, and in particular a first electrode and a second electrode preferably at one and the same height, and a third electrode at a height higher than that of the first and second electrodes.
  • the circuit arrangement associated to the sensing element may be configured to:
  • a sensor device of the above sort can be obtained by combining the concepts expressed previously with reference to Figures 45-46, on the one hand, and Figure 47, on the other.
  • An embodiment of this sort is illustrated, in fact, in Figures 48-49, where the sensitive element 270 of the sensor device includes the electrodes 270i, 270 2 and 270 3, the electrodes at the same height 270i and 270 2 being usable for quality detection, according to the principles explained previously with reference to Figures 45-46, and the upper electrode 270 3 being usable in combination with any one of the lower electrodes 270i and 270 2 for level detection, according to the principles explained previously with reference to Figure 47.
  • the electrodes can be positioned substantially like a triangle, where one side (corresponding to the electrodes 270i and 270 2 ) is set horizontal, whereas the upper vertex (corresponding to the electrode 270 3) is set at a higher level.
  • a first one of the two electrodes 270i and 270 2 at the base vertices, for example, the electrode 270i is used as common or reference electrode, whereas the second electrode set at the other base vertex, for example, the electrode 270 2 , is used with the common or reference electrode for detection of quality; the third electrode, here the electrode 270 3 at the upper vertex is used with the common or reference electrode for level detection.
  • the sensor could envisage at least two distinct electrodes for each of the aforesaid functions.
  • the electrodes of the sensing element 270 can be obtained in various ways, for example, by means of elements as exemplified in the figures.
  • the at least two electrodes of the sensing element can be obtained by means of screen printing with metallic inks on a corresponding electrically insulating substrate (for example, of alumina, plastic, or vetronite), or else by means of typical techniques used in the production of circuits, for example, constituted by multi-layers of photo-etched copper, and vetronite.
  • a suitable electrically insulating substrate for example, constituted by multi-layers of photo-etched copper, and vetronite.
  • the electrodes can also be coated by an electrically insulating layer.
  • the electrical quantity measured between the two pairs of electrodes (270 I -270 2 and 270 I -270 3 ), for example, the impedance, will be different according to the fluid set between them so that the different characteristics of the fluid will cause a different response between the electrodes of each pair.
  • the fluids considered are those typically of interest for a dispenser for dish-washing machines, such as detergent and liquid or semisolid (gel) additives, water, vinegar and air.
  • Figures 50 and 51 exemplify in graphic form the result of measurements of impedance carried out using a structure of sensitive element 270 of the type illustrated in Figures 48-49, with electrodes made of steel having a diameter of approximately 2 mm set at a distance of approximately 5 mm (measured between the central axes of the electrodes).
  • Indicated on the abscissae is the frequency, expressed in hertz, whereas indicated on the ordinates is the impedance, expressed in ohms.
  • the values given cover a wide frequency range, from 200 Hz to 10 MHz.
  • the graphs of Figure 50 presents the results of detections made between the two base electrodes 270i and 270 2 , i.e., a quality detection, for three different substances, namely water (curve H2O), a commercially available liquid detergent (WD), and a commercially available liquid brightener (WA).
  • a quality detection for three different substances, namely water (curve H2O), a commercially available liquid detergent (WD), and a commercially available liquid brightener (WA).
  • the impedance value measured in the three cases makes it possible to distinguish clearly the detergent from the brightener and from water.
  • a curve practically identical to the one designated by WD was obtained by measuring a commercially available detergent in gel form.
  • a possible logic of level detection based upon the use of a sensing element of the type illustrated in Figures 48-49 may envisage first of all a step of measurement of impedance between the electrodes at the same height (270i- 270 2 ), followed by a measurement of impedance between two electrodes at different heights (270 1 -270 3 ), and, in the case where the two values measured differ in a clear way (beyond a certain tolerance), it may be inferred that the level of the substance is in a position intermediate between the two electrodes at different heights.
  • the circuit arrangement associated to the sensitive element 270 may comprise a microcontroller and at least one driving circuit for the sensitive element.
  • the controller or card 250 there may be implemented also two driving circuits 252a and 252b, one for the pair of electrodes 270i and 270 2 and the other for the pair of electrodes 270i and 270 3 .
  • a single driving circuit may be sufficient.
  • Each driving circuit can be obtained in various ways.
  • Figure 53 illustrates schematically a case where the microcontroller used can generate a frequency signal, where the driving element of each pair of electrodes of a sensing element 270 may comprise an operational amplifier OA.
  • the amplifier OA has an input (here, the inverting input -) to which the sensing element 270 is connected in series, and a known reference resistance R r is connected in parallel between the input (-) and the output of the operational amplifier OA.
  • Zx is the unknown impedance to be measured between the pair of electrodes of the sensitive element 270.
  • the effective driving voltage generated by the microcontroller, designated by V s is constant, whereas the voltage value at output from the operational amplifier OA will thus depend upon the value of Zx.
  • the value of V u may, for example, be read using an analog input of the microcontroller, which will calculate the ratio between V s and V u , proportional to Zx.
  • the microcontroller 250 is not pre-arranged for generating a frequency output, it is possible to use an oscillating circuit, the resonance frequency of which is a function of an impedance value measured between the at least two electrodes of the sensing element 270, with the microcontroller pre-arranged to detect the impedance value on the basis of the aforesaid resonance frequency.
  • Such an oscillating circuit can be obtained in any known way, such as an RC network, an LC resonant circuit, or a crystal or dielectric resonator for defining the oscillation frequency thereof.
  • RC oscillators are generally used at low frequency (up to hundreds of kilohertz).
  • Forming part of this category are the following oscillators: Wien-bridge oscillators, bridged-T oscillators, twin-T oscillators network, and phase- shift oscillators (PSO).
  • PSO phase- shift oscillators
  • LC oscillators an LC network determines the oscillation frequency thereof. In this category there may belong, for example, Colpitts, Hartley, Clapp, Armstrong, and Meissner oscillators.
  • the electrical characteristics between two electrodes of the sensing element will cause variation of the resonance frequency of the resonant circuit, which may be read with an analog input or with a digital input of the microcontroller: in this case, the unknown impedance will be read on the basis of a frequency measurement.
  • Figure 55 provides a detail of the graphs of Figure 54 in the frequency range of between 10 kHz and 500 kHz.
  • quartz oscillators In quartz-crystal oscillators a piezoelectric crystal is used, which is distinguished by a natural resonance frequency. The resonance frequency is determined by the type of cut and by the shape of the material in the feedback network. To control frequency stability, the crystal generally used is that of quartz (SiCL), which has the shape of a hexagonal prism and may be natural or artificial.
  • a pair of electrodes of the sensitive element 270 set in series to a fixed and known capacitance, can be connected in parallel to the quartz.
  • the variations of the type of washing agent and of level result in a variation of the oscillation frequency of the circuit.
  • Figure 56 represents a Pierce oscillator that uses a CMOS inverter as amplifier.
  • the Pierce oscillator is a modified version of the Colpitts oscillator, in which, instead of an inductor, a quartz crystal is provided, denoted in the figure by Oq.
  • Oq a quartz crystal
  • the resistances Rf and R1 serve to fix the working point of the CMOS inverter.
  • C3 designates the aforesaid known capacitance connected in series to the sensitive element 270, the capacitance C3 and the element 270 being in parallel to the quartz Oq.
  • a sensing element of any of the types designated previously by 270 may belong to a sensor module designed for being mounted on the body of the dispenser.
  • the at least two electrodes of such a sensitive element can be associated to one and the same sensor body, configured for being mounted in a fluid-tight way on the dispenser body.
  • FIG. 57-59 An example of this sort is illustrated in Figures 57-59, where designated as a whole by 280 is a sensor body 280, preferably made of electrically insulated material, associated to which is a sensing element 270 including three electrodes 270i, 270 2 and 270 3 .
  • a sensing element 270 including three electrodes 270i, 270 2 and 270 3 .
  • such a structure as likewise that of the subsequent Figures 60-61, can be used also in the case of sensing elements 270 having just two electrodes, as in Figures 45-46 and/or in Figure 47.
  • the sensor body 280 has a tubular peripheral wall 280a, here substantially cylindrical, and a bottom wall 280b where the electrodes are mounted.
  • the end of the peripheral wall 280a opposite to the bottom wall 280b may conveniently define a flange 280c radially projecting outwards, possibly provided with one or more polarization and/or coupling elements 280d, i.e., elements configured to enable mounting of the sensor body 280 with a pre-set orientation within the rear portion of the inlet 210 of the body part 201 of the dispenser.
  • the rear portion of the inlet 210 is without a bottom wall of its own and is preferably shaped for receiving a corresponding portion of the sensor body 280, possibly shaped also to define one or more engagement elements.
  • One or more polarization and/or coupling elements can also be provided on the body part 201 that defines the inlet 210.
  • the peripheral wall 280a of the sensor body 280 may conveniently define a seat 280e ( Figure 58) for a corresponding annular sealing element 281 ( Figure 59).
  • the sensor body 280 may be interference fitted into the rear portion of the inlet 210, or else welded or bonded to the back of the inlet 210 at the flange 280c, or fixed via respective fixing means, such as a bayonet attachment.
  • FIG. 60-61 A substantially similar embodiment is illustrated in Figures 60-61, where the flange 280c of the sensor body 280 is provided with an extension 280d that, in addition to functioning as polarization element, has a through hole passing through a fixing element 210e, for example, a screw, which is to be received in a corresponding extension 210d of the inlet 210, provided at the back of the inlet itself.
  • a fixing element 210e for example, a screw
  • FIG. 62 Illustrated schematically in Figure 62 is a possible embodiment of a sensor device, the sensing element 270’ of which includes at least one piezoelectric element, designated by 270a, set between two corresponding connection electrodes 270b.
  • the piezoelectric element 270a and the electrodes 270b may be arranged on a corresponding electrically insulating substrate, set within a sensor body 280, here having a substantially cylindrical shape.
  • the sensor body 280 is provided at the front with a dielectric or electrically insulating layer, designated by 270c, which is to come into contact with the liquid and is designed to isolate the electrical parts from the substance undergoing measurement, the layer 270c preferentially coating at least the piezoelectric element 270a and the corresponding terminals.
  • Figure 62 also highlights how, in various embodiments, a sensor device that equips the dispenser does not necessarily have to be arranged at an inlet of a fixed dispenser part, but, instead, may be set in a housing in fluid communication with the inlet.
  • a housing defined in the back of the body 201 of the fixed dispenser part is a housing, designated by 222, here having a generally cylindrical shape that includes a bottom wall 222a (here formed by a stretch of the bottom wall of the housing 214 for the pump) and a peripheral wall 222b, where the sensor body 280 is mounted.
  • the housing 222 is connected in fluid communication with the inlet 210, in particular via an opening in the bottom wall 222a.
  • suitable sealing means in the example, the body 280 is provided at the front with an annular sealing element 290a, to obtain axial or front sealing with respect to a corresponding seat 222c defined within the housing 222; in the example, the housing 222 is moreover shaped to define an annular part 222d bearing or resting on which is the front of the sensor device, here the layer 270c.
  • the sensor body 280 can be fixed in the housing 222 according to any known modality.
  • Figures 63 and 64 illustrate a possible embodiment of the active part of a sensor of the type illustrated in Figure 62.
  • designated by 270d is an electrically insulating substrate, for example, of a ceramic type, preferably having a thickness of less than one millimetre.
  • the substrate may, for example, be made of alumina and have a thickness comprised between 0.5 and 1 mm, in particular between 0.6 and 0.7 mm.
  • the substrate is provided with holes 270e, where respective electrical terminals 270f, preferably made of metal, are mounted or deposited on the rear side of the substrate 270d.
  • a piezoelectric element 270a is provided, set between two electrodes 270b.
  • the element 270a is disk-shaped, and the electrodes 270b have a corresponding disk-shaped part, radially extending from which is a respective connection portion 270bi designed to come into the contact with the terminals 270f, via the holes 270e.
  • the piezoelectric material used to obtain the element 270a may, for example, be a lead-zirconate-titanate (PZT) solid mixture; its thickness may be comprised between 50 and 150 pm, in particular approximately 100 pm; the electrodes 27b are preferentially made of a noble metal, for example, platinum, having a thickness comprised between 5 and 30 pm, preferably approximately 10 pm.
  • PZT lead-zirconate-titanate
  • the set formed by the piezoelectric element and the corresponding electrodes is isolated from the washing agent.
  • the isolation does not necessarily have to involve the entire front side of the substrate: in the case exemplified in Figures 63-64, for this purpose a localized layer 270c of dielectric material is provided, namely, a layer that coats a limited region of the front side of the substrate 270d and under which the element 270a and the electrodes 270b are located.
  • the layer 270c may have a thickness comprised between 10 and 30 pm, in particular approximately 15 pm, and be made of any dielectric material suitable for the purpose, even of a vitreous type.
  • the layer 270c may be made of the material commercially identified by the code “G-485-2”, with base of bismuth, silicon, and boron.
  • the layers that form the piezoelectric element 270a, the electrodes 270b, and the insulating coating 270c can be obtained with any known technique, for example, techniques of deposition normally used in the electronic field.
  • the provision of the dielectric layer 270c is to be understood as optional, in so far as the ensemble formed by the piezoelectric element 270 could be envisaged for direct contact with the washing agent: an example in this sense is illustrated schematically in Figure 65, where associated to the front side of a substrate 270c are two sets - each comprising one piezoelectric element 270a and two electrodes 270b - which are directly exposed. Provision of an insulation must be deemed preferable in the perspective of an increase in the service life of the sensor.
  • a piezoelectric sensor of the type referred to can be used both for the purpose of level detection and for the purpose of quality detection.
  • an electrical value characteristic of the piezoelectric element 270a which is, for example, its impedance, will be affected not only by the electrical characteristics of the medium in which it may be immersed, but also by the mechanical characteristics of the substance being detected, in particular by its viscosity and its density, this in consideration of the fact that the vibration frequency of the element 270a will be different according to whether the layer 270c, which is set up against the element 270a itself, is in contact with the liquid substance or not (in air), and according to the type of substance, i.e., more or less viscous or more or less dense.
  • the frequency of vibration of the piezoelectric element 270a will be different according to whether the front layer 270c of the sensor 270’ is in contact or not (or in contact to a greater or lesser extent) with the liquid substance, it thereby being possible to discriminate whether the level is higher or lower than a given threshold.
  • the frequency of vibration it will also be possible to discriminate whether the aforesaid layer 270c is in contact with a more dense/viscous substance or else with a less dense/viscous substance.
  • Figures 66 and 67 exemplify in graphic form the result of measurements of impedance made using a structure of sensitive element 270’ of the type illustrated in Figures 63-64, having the preferential characteristics referred to above.
  • the abscissae represent the frequency, in hertz, whereas the ordinates represent the impedance, in ohm.
  • the values given cover a wide range of low frequencies from 200 to 300 Hz.
  • the graph of Figure 66 provides the result of detections of quality for the same three liquid substances as those appearing in Figure 50, namely, water (curve H2O), a commercially available liquid detergent (WD), and a commercially available liquid brightener (WA).
  • water curve H2O
  • WD commercially available liquid detergent
  • WA commercially available liquid brightener
  • the graph of Figure 67 shows the result of a detection made with the ensemble formed by the piezoelectric element 270a and the electrodes 270b not immersed in a liquid, i.e., in air: from a comparison between Figures 66 and 67 it is hence easy to note how the sensitive element 270’ makes it possible to distinguish clearly the presence or absence of liquid, i.e., discriminate whether the liquid substance is above or below a threshold level substantially determined by the position of the piezoelectric element.
  • a sensor may be provided, the sensing element 270’ of which exploits both the forward (direct) piezoelectric effect and the inverse piezoelectric effect.
  • the sensing element 270’ of which exploits both the forward (direct) piezoelectric effect and the inverse piezoelectric effect is illustrated schematically in Figure 65, where associated to the substrate 270d are two piezoelectric elements 270a’ with corresponding connection electrodes 270b: a first of the two elements 270a will be supplied with a predefined voltage in order to cause vibration thereof by the inverse piezoelectric effect, whereas the second element 270a will be used for generating, exploiting the forward piezoelectric effect, a potential difference the value of which will depend upon the frequency of vibration of the first element 270a.
  • a sensor of this sort which can be obtained according to circuit modalities in themselves known, can thus be used for obtaining both level information and information regarding a qualitative characteristic of the washing agent.
  • the two sets each formed by the piezoelectric element 270a and the corresponding electrodes 270b is without the layer 270c, but in other versions the layer could be provided.
  • a piezoelectric sensor may, for example, prove advantageous for the purpose of discriminating the type of washing agent on the basis of its physical characteristics, such as the viscosity or density, which, as has been said, affect the response of the sensor.
  • a detergent WD or additive WA is of a liquid type or semisolid (gel) type.
  • Such information may, for example, be used by the control system CS of the dish-washing machine 1 for adapting a washing program previously started by a user (this applies of course for any characteristic of a qualitative type that can be detected via the other types of sensor described herein).
  • a sensor of a piezoelectric type can equip each of the two tanks R1 and R2.
  • At least one sensor device that equips the dispenser is a sensor of an optical type, i.e., having a sensitive element that comprises at least one emitter and at least one receiver of electromagnetic radiation.
  • the optical sensor designated as a whole by 500, is preferably configured in the form of module designed to be installed on the fixed dispenser part 200, for example, at one of the inlets 210 or 211 or of a corresponding housing 222, as described previously, preferably with interposition of at least one annular sealing element.
  • at least part of the sensor body may be integrated or defined by the body of the fixed dispenser part 200.
  • the sensor body comprises two main parts, designated by 501 and 502, coupled together preferably in a sealed way and made, for instance, of plastic material.
  • the body part 501 has a generally cylindrical conformation, possibly provided at a distal end with a flange 501b.
  • a sensing element mounted on the proximal end of the body part 501 is a sensing element, including at least one emitter 270a’ of electromagnetic radiation, such as radiation in the visible, and at least one receiver of the radiation 270b’; the emitter may, for example, be an emitter diode, whereas the at least one receiver may comprise at least two distinct receivers, for example, photodetectors or photodiodes suitable for detecting the light emission generated by the emitter.
  • the receiver 270b’ may be a single receiver of the CMOS-array type, comprising a linear series or array of independent pixels, each constituted by a photo -detector.
  • the body part 502 performs mainly functions of casing, and for this purpose has a hollow cylindrical shape so as to be able to receive inside it the cylindrical portion of the body part 501.
  • the part 502 then has a peripheral wall 502a and a bottom wall 502b, which is provided with a through opening 502c,
  • the two body parts 501 and 502 are coupled together, preferably with interposition of sealing means.
  • the coupling between the two parts is a threaded coupling, and for this purpose the cylindrical portion of the part 501 is provided on the outside with a male thread, designed for engagement with a corresponding female thread (not visible) provided on the inner side of the peripheral wall 502a of the body part 502.
  • an optical element 503 is provided, in particular having functions of optical prism.
  • the body part 501 may be shaped so as to define positioning or spacer elements 501c for the optical element 503.
  • the optical element 503 may, for example, be made of polycarbonate, or of other material transparent to the light radiation emitted by the emitter 270a’.
  • the element 503 has a front wall 503a, a peripheral wall 503b, and a rear wall 503c, the latter being designed to face the emitter 207a’ and the receiver 207b’.
  • the optical element has an at least approximately frustoconical shape, but this does not constitute an essential characteristic.
  • Designated by 504 is a shaped annular sealing element, which is designed to be set between the optical element 503 and the body part 502; the through hole of the sealing element 504 preferably has a profile congruent to that of the peripheral wall 503b of the optical element 503, and hence, in the example, a substantially frustoconical profile.
  • the sealing element 504 in the assembled condition of the sensor 500, is arranged in such a way as to provide a seal between the body parts 501 502 and the optical element 503, so that the front surface 503a of the element 503 can face a liquid, through the opening 502c in the body part 502, without any risks of infiltration towards the inside of the sensor 500.
  • operation of the sensor 500 is based upon the optical laws linked to refraction/reflection of optical radiation, and in particular on the principle of the critical angle of total reflection. More in particular, such an operating principle is based on the dependence of the refractive index of the liquid substance upon its composition or concentration: the measurement is hence based on the jump of index between the liquid to be analysed, i.e., the washing agent, and the solid material of the optical element 503, exploiting the principle of total internal reflection at the interface between the two media.
  • the emitter 270a’ and the receiver 270b’ are arranged in one and the same plane of lie, also for requirements of representation; in this configuration, the optical element 503 may be suitably shaped to define appropriate angles of reflection/refraction between the emitter 270a’, the receiver 270b’, and the interface wall represented by the front surface of the optical element 503.
  • the emitter 270a’ and the receiver 270b’ have, instead, the respective active parts of emission and reception, respectively, that generally face one another, but are set at an angle with respect to one another, preferably in such a way that the respective axes intersect.
  • the concept is illustrated schematically in Figures 73- 74, where the emitter 270a’ and the receiver 270b’ are arranged according to respective planes of lie that form between them an angle a, which is preferably less than 90°; instead, the two planes passing through the axes b of the receiver and of the emitter, respectively (meaning thereby two planes orthogonal to the plane of the sheet of Figure 73-74), form between them an angle that is preferably greater than 90°.
  • the aforesaid angles may be predefined at least on the basis of the plastic material used to obtain the optical element 503 and of the type of emitter, according to a technique in itself known.
  • the rear surface of the body of the optical element 503 defines two faces 503c’, 503c” that are inclined with opposed orientations so that the emitter 207a’, on one side, and the receiver 207b’, on the other side, face and are generally parallel to a respective said inclined face.
  • the inclination of the faces 503c’, 503c” is preferably calculated in such a way that the optical signal traverses it in a direction that is as orthogonal as possible with respect to the surfaces of entry and exit of the light so as to minimize reflection at the air-solid and solid-air interfaces, respectively.
  • the emitter 207a’ illuminates the interface surface - represented by the front surface 503a of the element 503 - at the angles of interest around the critical angle, and hence with an incidence greater and smaller than the critical angle.
  • the emitter 207a’ illuminates the interface surface - represented by the front surface 503a of the element 503 - at the angles of interest around the critical angle, and hence with an incidence greater and smaller than the critical angle.
  • an area affected by the totally reflected rays linked to those with incidence greater than the critical angle
  • an area affected at lower intensity which is illuminated by the partially reflected rays (linked to those with incidence less than the critical angle). It is thus possible to obtain, at the exit, a field of intensity in which separation between the area markedly illuminated by total internal reflection and the area less illuminated (partial reflection) varies as a function of the concentration of the liquid.
  • Figure 74 represents schematically the case of a substance or washing agent having a second composition or concentration (for example, a lower concentration than in the previous case): the rays of the illuminating beam R produced by the emitter 720a’ always impinge at the same angle, whereas the critical angle varies (decreases) depending upon the composition of the substance. Also in this case, the resulting beam R2 will hence include totally reflected rays and partially reflected rays, but with a greater intensity of illumination on the “upper” receiver 270b’.
  • a second composition or concentration for example, a lower concentration than in the previous case
  • the optical element 503 is configured to contribute to propagation of the optical radiation by refraction and/or reflection from the at least one emitter 270a’ to the at least one receiver 270b’, in such a way that the radiation is at least in part propagated through the element 503 towards the at least one receiver 270b’ with an angle and/or with an intensity that varies as a function of a qualitative characteristic of the liquid substance.
  • the optical sensor 500 can also be used as level sensor.
  • the light beam emitted by the emitter 270a’ will be practically completely reflected towards the receiver 270b’, whereas, in the presence of liquid at the interface, part of the light beam will be refracted in the liquid, striking the receiver 270b’ with reduced intensity.
  • the level-detection function could be obtained even without exploiting the principle linked to the critical angle of total reflection; i.e., it could be based upon the simple reflection/refraction of the optical radiation.
  • a device for detecting the level and/or at least one qualitative characteristic of a washing agent is set at least in part at an inlet of a dispenser part, or in a corresponding housing connected in fluid communication with the aforesaid inlet.
  • a sensor device may, instead, be set at least in part in a corresponding detection chamber, even in a remote position with respect to such an inlet, and not directly connected to a corresponding arrangement for delivery of the washing agent.
  • a tank has a detection opening, which may be coupled in a separable and fluid-tight way with respect to an inlet opening present in the fixed dispenser part, the inlet opening being in fluid communication with the detection chamber.
  • the detection opening and the inlet opening of the detection chamber are defined in respective walls of the removable and fixed parts of the dispenser, respectively, which are designed to face one another in the operating condition of the dispenser.
  • Embodiments of this sort are exemplified in Figures 75 and 76, where designated by 112’ are the aforesaid detection openings, preferably defined by tubular portions of the hollow body 101 having a structure similar to the one described previously with reference to the outlets 112 and 113.
  • Designated by 210’ are, instead, the aforesaid detection chambers, which here are not in fluid communication with inlets of the fixed part 200.
  • the chambers 210’ are preferably defined by tubular portions of the body 201 having a structure similar to the one described previously with reference to the inlets 210 and 201, with a peripheral wall part 210a’ and a bottom wall 210b’, at which the sensing element 270 is mounted: in this case, however, the chambers 210’do not belong, and are not directly connected, to an arrangement for dispensing of the washing agent in question.
  • the sensing component 270 of the sensor device includes electrodes 270i, 270 3 (and possibly 270 2 ) of the type already described previously, provided for coming directly into contact with the liquid substance, for example, for measurement of conductivity or impedance
  • the sensitive component 270 includes electrodes 270i, 270 3 (and possibly 270 2 ) that are isolated from the liquid substance via an electrically insulating layer 270 4 , for example, for a measurement of a capacitive type.
  • the openings 210 may be provided with automatically driven non-return valves of the type described previously.
  • a level-sensor device and/or quality- sensor device has a first part mounted on the removable dispenser part and a second part mounted on the fixed dispenser part, the first part and the second part preferably interacting by means of an electromagnetic or inductive signal or field.
  • FIG. 77 An embodiment of this sort is illustrated schematically in Figure 77, where the sensor device represented has a sensing element 270” mounted at a housing 112” defined in the hollow body 101, in particular at a closing bottom 112b”.
  • the element 270” includes, for example, a circuit 270a” connected to electrodes 270i, 270 3 (and possibly 270 2 ), which extend towards the inside of the tank, here the tank Rl.
  • a second communication part of the sensor, designated by 270b” is, instead, mounted on the outer side of a closing bottom 210b” of a housing 210”, defined in the body 201.
  • the communication part 270b” includes a respective circuit and connection terminals 270 5 for electrical connection to a circuit arrangement on board the dispenser or the dish washer.
  • the housings 112” and 210” may have a tubular structure similar to the one described previously with reference to the outlets 112, 113 and to the inlets 210, 2011, and can hence be coupled in a releasable way so that - in the condition where the removable dispenser part 101 and the fixed dispenser part 200 are coupled together - the bottom walls 112b” and 210b” substantially face one another.
  • the housings 112” and 210” are then closed at the rear and, given the presence of the bottom walls 112b” and 210b”, the housings themselves are not connected in fluid communication and do not belong to an arrangement for dispensing of the washing agent contained in the tank Rl.
  • the principle of transmission/reception of data between the sensing element 270”, i.e., its circuit 270a”, and the communication part 270b”, i.e., its circuit, may be of a type similar to that of passive electrical radio -frequency devices without autonomous supply, for example, RFID devices, which, for this purpose, comprise respective antennas.
  • RFID devices which, for this purpose, comprise respective antennas.
  • the supply voltage of the circuit 270a” is supplied by the circuit of the part 270b”, which is operative for generating in a known way an electromagnetic field, for example, via a 125-kHz signal; in practice, the electromagnetic field induces a supply voltage, which can in turn transmit data to the circuit of the part 270b”.
  • level and/or quality detections similar to the ones described previously may be made and communicated in wireless mode to the reading part 270b”, which in turn makes them available to the circuit arrangement on board the dispenser or the dish-washing machine 1.
  • the dispenser includes at least a part that can be operated manually by a user, and a locking/unlocking arrangement, which is controllable to prevent or enable displacement of the operable part between two positions thereof.
  • a locking/unlocking arrangement which is controllable to prevent or enable displacement of the operable part between two positions thereof.
  • the locking mechanism of the arrangement includes at least one retaining element mounted on the fixed dispenser part in a displaceable way between a retaining position and a release position with respect to a retaining counter element present on the removable dispenser part.
  • each element 206i and 200 2 has associated or defines a corresponding retaining element 206c, here exemplified in the form of a hook, which projects at the front (along the dimension Z) beyond the front side of the positioning and/or guiding formations 205.
  • a corresponding retaining element 206c here exemplified in the form of a hook, which projects at the front (along the dimension Z) beyond the front side of the positioning and/or guiding formations 205.
  • defined at the back of the hollow body 101 are corresponding housings or seats 121, which function as retaining counter-elements, with respect to which the elements 206c are able to assume at least a retaining position and a releasing position.
  • the seats 121 are configured and positioned in such a way that, when the movable dispenser part 100 is coupled on the fixed dispenser part 200, at least part of each retaining element 206c can project into the corresponding seat 121, with the possibility of angular movement between the retaining position and the releasing position. This angular movement is obtained through the corresponding angular movement of the locking elements 206i, 2O6 2 , to which the retaining elements are fixed in rotation.
  • an element 206c and the corresponding seat 121, on one side, and the other element 206c, and the corresponding seat 121, on the other side are shaped in a different way, considering that the angular positions of retaining and releasing of the two elements 206c are different.
  • the retaining elements, on one side, and the corresponding retaining counter-elements, on the other side could be the same as one another.
  • the cam member 451 defines a more complex cam profile as compared to the case of Figures 31-36.
  • a profile includes two opposite stretches 452a and 452b that extend each according to a respective arc of circumference, the two circumferences being preferably one greater than the other, and two intermediate connection stretches 452c and 452d, which are longer, of which one (452c) is distinguished by a recess, and the other (452d) is distinguished by a projection.
  • Figure 79 exemplifies a condition corresponding to that of Figures 31-32, with the cam member 451 that is in an angular position such that the locking members 206 1 and 2O6 2 do not enable operation of the latching/releasing devices 105 1 and 105 2 .
  • both of the retaining elements 206c are in an angular position of engagement with respect to the retaining counter-elements represented by the seats 121.
  • the removable dispenser part 100 cannot consequently be removed from the fixed dispenser part 200.
  • Figure 80 exemplifies a condition corresponding to that of Figures 33-34, with the cam member 451 that is in an angular position such that the locking members 206 1 and 2O6 2 prevent operation of the latching/releasing device 105 2 and enable, instead, operation of the latching/releasing device 105 1 , respectively.
  • the retaining element 206c on the left is in an angular position of engagement with respect to the corresponding seat 121
  • the retaining element 206c on the right is in an angular position of release with respect to the corresponding seat 121: consequently, also in this condition, the removable dispenser part 100 cannot be removed from the fixed dispenser part 200.
  • Figure 81 exemplifies a condition corresponding to that of Figures 35-36, with the cam member 451 that is in an angular position such that the locking members 206 1 and 2O6 2 prevent operation of the latching/releasing device 105 1 and enable, instead, operation of the latching/releasing device 105 2 , respectively.
  • the retaining element 206c on the right is in an angular position of release with respect to the corresponding seat 121
  • the retaining element 206c on the left is in an angular position of engagement with respect to the corresponding seat 121: consequently, also in this condition, the removable dispenser part 100 cannot be removed from the fixed dispenser part 200.
  • Figure 82 exemplifies a condition where the cam member 451 is in an angular position such that the locking members 206i and 2O6 2 enable operation of both of the latching/releasing devices 1051 and 105 2 .
  • both of the retaining elements 206c are in an angular position of release with respect to the corresponding counter-elements represented by the seats 121. Consequently, in this condition, the removable dispenser part 100 can be removed from the fixed dispenser part 200.
  • Control of the actuator 450 for the purposes of the obtaining the positions of Figures 79, 80, and 81 can be carried out according to modalities substantially similar to those described previously with reference to Figures 31-36, and hence, for example, as a function of level information obtained by sensor devices that equip the dispenser and/or as a function of signals supplied by the control system CS of the dish-washing machine 1.
  • Reaching of the position of Figure 82 may, for example, be determined when there arises the condition (which on the other hand is statistically rare) where inside both of the tanks R1 and R2 an amount of washing agent is present lower than a corresponding pre-set minimum level, indicative of the need for topping-up.
  • Another condition that can determine reaching of the position of Figure 82 is, for example, detection, by a quality sensor of the dispenser, of an anomalous condition regarding the contents of any of the two tanks, for example, in the case where in the tank R1 for the washing detergent WD there is detected the presence of a rinsing additive WA.
  • a quality sensor of the dispenser detects the presence of a rinsing additive WA.
  • the position of Figure 82 could also be obtained following upon a command imparted by the user, for example, using a key purposely provided in the control panel of the machine 1.
  • the locking/unlocking arrangement is devised to carry out a dual function, corresponding to the possibility of opening of the hatches 104i, 104 2 a and to the possibility of removal of the removable dispenser part 100, preferably in order to use a single electric actuator 450 to obtain both functions. It is, however, clear that the two functions could be separate from one another, for example, using respective electric actuators, or the dispenser could include just the function of blocking/unblocking of the removable dispenser part.
  • the locking/unlocking arrangement could be devised to interact with the coupling/uncoupling arrangement operating between the removable dispenser part and the fixed dispenser part (see, for example, what is described with reference to Figures 13-14), which as has been said can be switched manually at least from a position of engagement to a position of release, to prevent or enable removal of the removable dispenser part.
  • the locking/unlocking arrangement may, for example, be configured in such a way that, in its operative and inoperative conditions, the locking mechanism will prevent and enable, respectively, switching of the coupling/uncoupling arrangement from its position of engagement to its position of release.
  • retaining elements similar to those designated by 206c could be arranged further down with respect to the case exemplified in the figure and mounted movable to assume a first angular blocking position, in which they interfere mechanically with the rotation of the coupling/uncoupling member 220 (see Figures 9-11), for example, at the corresponding recesses 220e, and a second angular unblocking position, where their angular position is such as not to constitute a hindrance to rotation of the member 220.
  • the solution of providing a reversible peristaltic pump, with a command arrangement associated thereto makes it possible to use the pump itself for the purposes of delivery of two different washing agents, via two different dispensing arrangements;
  • the solution of providing a removable dispenser part defining at least one tank, the outlet of which is provided with an automatically driven non-return valve makes it possible to prevent risks of dispersion in the environment of the corresponding washing agent, when the removable dispenser part is removed from a fixed dispenser part;
  • the solution of providing on the front of the dispenser a purposely designed housing for a tablet of washing agent that is directly exposed simplifies production of the dispenser as compared to the prior art and at the same time simplifies the activity of loading-in of the tablet by the user;
  • the solution of providing a signalling system, with a light-generation element on a fixed dispenser part and
  • one and the same sensor device could include both electrodes for detection of an electrical quantity and a piezoelectric element for detection of a physical characteristic (viscosity or density), or else at least one light emitter and at least one light receiver for a detection of an optical type.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

Distributeur d'agent de lavage pour lave-vaisselles comprenant un corps de distributeur (100) conçu pour être monté sur une paroi (5) délimitant une chambre de lavage de lave-vaisselle, le corps de distributeur (100) étant conçu pour être exposé au moins en partie à l'intérieur de la chambre de lavage du lave-vaisselle. Au moins un réservoir (Rl, R2) apte à contenir une substance correspondante sous forme liquide ou semi-solide est défini dans le corps de distributeur (100), et le distributeur (10) comprend au moins un agencement de distribution qui est conçu pour distribuer de premières quantités dosées de la substance. Le distributeur comprend en outre au moins un dispositif de capteur configuré pour fournir un signal électrique représentatif d'au moins une caractéristique qualitative de la substance contenue à l'intérieur de l'au moins un réservoir (R1, R2).
EP21734226.0A 2020-06-05 2021-06-04 Distributeur d'agent de lavage pour lave-vaisselles Pending EP4161341A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000013468A IT202000013468A1 (it) 2020-06-05 2020-06-05 Dispensatore di agenti di lavaggio per lavastoviglie
PCT/IB2021/054924 WO2021245622A1 (fr) 2020-06-05 2021-06-04 Distributeur d'agent de lavage pour lave-vaisselles

Publications (1)

Publication Number Publication Date
EP4161341A1 true EP4161341A1 (fr) 2023-04-12

Family

ID=72266659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21734226.0A Pending EP4161341A1 (fr) 2020-06-05 2021-06-04 Distributeur d'agent de lavage pour lave-vaisselles

Country Status (5)

Country Link
US (1) US20230233052A1 (fr)
EP (1) EP4161341A1 (fr)
CN (1) CN116075260A (fr)
IT (1) IT202000013468A1 (fr)
WO (1) WO2021245622A1 (fr)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9103636U1 (de) 1991-03-25 1992-07-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Tür für Haushalt-Geschirrspülmaschinen
IT230721Y1 (it) 1994-07-05 1999-06-09 R & D S Srl Dispensatore integrato di detersivi ed additivi in polvere e liquidi per macchine lavatrici, in particolare macchine lavastoviglie domesti
NZ314155A (en) 1997-01-30 1999-07-29 Fisher & Paykel Dishwasher detergent dispenser located in door recess, having open top and being flushed out by overhead nozzle
IT1320649B1 (it) 2000-03-29 2003-12-10 Eltek Spa Dispositivo dispensatore di agenti di lavaggio per una macchina dilavaggio domestica, in particolare una lavastoviglie.
ITTO20010078A1 (it) 2001-01-26 2002-07-26 Eltek Spa Dispositivo dispensatore di agenti di lavaggio per una macchina di lavaggio domestica, in particolare una lavastoviglie.
ITTO20010190A1 (it) 2001-03-02 2002-09-02 Eltek Spa Dispositivo dispensatore di agenti di lavaggio per una macchina lavastoviglie.
US7571734B2 (en) 2005-01-20 2009-08-11 General Electric Company Fluid dispensing system for a washing device
DE102006043973A1 (de) * 2006-09-19 2008-03-27 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltsgerät mit Reinigungsmitteldosiersystem
US7845361B1 (en) 2006-11-08 2010-12-07 Knight, Llc Design and method for a dripless liquid wash aid pumping mechanism
EP2138088B1 (fr) 2008-06-26 2011-09-21 Candy S.p.A. Dispositif distributeur pour comprimé de détergent pour lave-vaisselle
DE102009027950A1 (de) * 2009-07-23 2011-01-27 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltsgerät
WO2015003922A1 (fr) * 2013-07-08 2015-01-15 Arcelik Anonim Sirketi Lave-vaisselle comprenant un système de nettoyage pour une unité de dosage de détergent liquide/en gel et une unité de réceptacle
PL227422B1 (pl) * 2014-12-12 2017-11-30 Bitron Poland Spółka Z Ograniczoną Odpowiedzialnością Urzadzenie do dozowania srodka myjacego i srodka płuczacego, szczególnie do zmywarki do naczyn
DE102018214644A1 (de) * 2018-08-29 2020-03-05 BSH Hausgeräte GmbH Haushalts-Geschirrspülmaschine, Verfahren zum Betreiben einer Haushalts-Geschirrspülmaschine und Computerprogrammprodukt

Also Published As

Publication number Publication date
CN116075260A (zh) 2023-05-05
US20230233052A1 (en) 2023-07-27
WO2021245622A1 (fr) 2021-12-09
IT202000013468A1 (it) 2021-12-05

Similar Documents

Publication Publication Date Title
WO2021245612A1 (fr) Distributeur d'agent de lavage pour lave-vaisselle
EP4161340A1 (fr) Distributeur de produits de lavage pour lave-vaisselle
US8950254B2 (en) Beverage machine with integrated ultrasonic transceiver
US8992694B2 (en) Flow rate sensor and related dishwasher
US6675818B1 (en) Dishwashing machine
US8627984B2 (en) Non-integrated bulk dispenser and method of operating a dishwasher having same
WO1994027489A1 (fr) Alarme pour produits solides detectant la baisse de niveau du produit
CN102573596B (zh) 例如洗碗机或洗衣机的清洗机以及操作清洗机的方法
KR101981679B1 (ko) 식기세척기 및 식기세척기의 센싱 모듈
EP2180816A2 (fr) Dispositif de distribution, en particulier pour appareils domestiques
KR20140089617A (ko) 정전용량 센서 조립체를 갖는 물질 분배 시스템 및 방법
CN102798432A (zh) 水位感测装置、供水软管和具有水位感测装置的洗衣机
WO2021245618A1 (fr) Distributeur d'agent de lavage pour lave-vaisselle
US20190125160A1 (en) Motor Driven In-Door Dishwasher Aid Dispenser
EP4161341A1 (fr) Distributeur d'agent de lavage pour lave-vaisselles
WO2021245613A1 (fr) Distributeur d'agent de lavage pour lave-vaisselle
WO2021245616A1 (fr) Distributeur d'agent de lavage pour des lave-vaisselle
WO2021245617A1 (fr) Distributeur d'agent de lavage pour lave-vaisselles
EP3433411B1 (fr) Machine à laver domestique
US20240156322A1 (en) Dishwashing appliance and filter having a visual fill volume indication
EP0947156A1 (fr) Dispositif pour le dosage et l'approvisionnement en liquide dans une machine à laver en particulier dans un lave-vaisselle
EP3433408A1 (fr) Machine à laver le linge comprenant un dispositif d'adoucissement de l'eau

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20221201

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)