EP0032472A1 - Strömungsverteiler und seine Anwendung in elektrischen Haushaltsgeräten, insbesondere in Waschmaschinen - Google Patents

Strömungsverteiler und seine Anwendung in elektrischen Haushaltsgeräten, insbesondere in Waschmaschinen Download PDF

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Publication number
EP0032472A1
EP0032472A1 EP81400028A EP81400028A EP0032472A1 EP 0032472 A1 EP0032472 A1 EP 0032472A1 EP 81400028 A EP81400028 A EP 81400028A EP 81400028 A EP81400028 A EP 81400028A EP 0032472 A1 EP0032472 A1 EP 0032472A1
Authority
EP
European Patent Office
Prior art keywords
fluid
flip
distributor according
fluid distributor
transmission means
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.)
Withdrawn
Application number
EP81400028A
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English (en)
French (fr)
Inventor
Cyrille Pavlin
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.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Publication of EP0032472A1 publication Critical patent/EP0032472A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/04—Control of operations performed in washing machines or washer-dryers  non-electrically
    • D06F33/08—Control of operations performed in washing machines or washer-dryers  non-electrically substantially hydraulically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/003—Circuit elements having no moving parts for process regulation, (e.g. chemical processes, in boilers or the like); for machine tool control (e.g. sewing machines, automatic washing machines); for liquid level control; for controlling various mechanisms; for alarm circuits; for ac-dc transducers for control purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C7/00—Hybrid elements, i.e. circuit elements having features according to groups F15C1/00 and F15C3/00

Definitions

  • the present invention relates to a fluid distributor and its application to household appliances and more particularly those of the washing machine type.
  • a single order distributor is therefore desirable, in order to reduce the size of this request as well as its cost price.
  • separate controls increasing the number of electromagnetic relays, further decrease the reliability of the washing machine in general.
  • the distributors of the prior art responding to this problem of a single order generally have the drawback of not being able to supply each of the channels controlled separately. This is for example the case in the distributor described in French patent 2-285 487. In fact, the distributor described in this patent to supply water to a given channel, is forced to supply water to another channel as well, which can be detrimental to certain washing sequences.
  • the present invention aims to remedy this drawback by the definition of a fluid distributor comprising a set of flip-flops of the bistable type controlled by a single solenoid valve.
  • the fluid distributor comprises at least one fluid flip-flop of the bistable type, one control channel of which is closed, a single solenoid valve supplying the distributor, and for each fluid flip-flop used, pressure transmission means connected to the only control channel and the preferred output channel of this fluid rocker.
  • connection between a pressure transmission means and the preferred outlet channel of the corresponding rocker is located at an outlet of the fluid distributor.
  • the present invention aims to define a fluid distributor making it possible to supply each outlet independently of the others, the choice of a particular outlet being made using a single external control.
  • the prior art uses the attachment property of this jet on a divergent wall.
  • a fluid flip-flop which takes advantage of this property of attachment of the jet on a divergent wall generally has an asymmetry in its geometry which has the aim of favoring, in the absence of transverse flow, an outlet channel during the placing under pressure, by modifying the position, or the value of the angle of inclination with respect to the direction of the jet, of one of the divergent walls with respect to the other; the jet is indeed more difficult to attach to a wall if it is further back or has a greater divergence.
  • Figure l illustrates such a type of flip-flop. It comprises a main supply of fluid 1, a tyere 2 of rectangular section of width e, two separate supplies of so-called control fluid 3, 4 acting at the level of the diffuser 7 by two conduits 5 and 6.
  • the outlet of the diffuser 7 is connected to the two outlet channels 8 and 9, delimited by a blade 14 having an angle of less than 24 °; the distance d, between the edge of the blade 14 and the inlet of the nozzle 2, is in this type of rocker of the order of 6e to 8e.
  • this fluid rocker is as follows: the fluid coming from the main supply 1 is expanded in the nozzle 2 and injected in the form of a jet in the diffuser 7.
  • the outlet of the nozzle 2 being offset with respect to the axis of symmetry of the two outlet channels 8 and 9, the jet attaches to the nearest divergent wall, in the absence of control.
  • the jet thus attaches to the wall corresponding to the exit channel 8 which is called the preferred channel. If now sufficient fluid pressure is applied to the control channel 4, the jet in the diffuser 7 switches over and attaches to the wall corresponding to the outlet channel 9 called the non-preferred channel.
  • This type of flip-flop however presents difficulties of use, in particular when it is desired to mount several in cascade in order to obtain, for example, a fluid distributor with four or more outlets.
  • a first difficulty is then the poor recovery of the dynamic pressure at the outlet of such a flip-flop which is close to 30%, limiting the number of flip-flops mounted in cascade.
  • This pressure loss results from the deterioration of the flow due to the turbulent mixing in the interaction zone (attachment of the jet to the wall of the outlet channel following a double curvature of the fluid jet), and losses in the diffuser 7.
  • a second difficulty comes from the angle ⁇ of the separation plate 14 between the two exit channels 8 and 9 which is small, (less than 24 °) which increases the difficulty of technological realization during the cascading because the small size often required for these scales.
  • FIG. 2 shows a second example of a bistable fluid rocker making it possible to obtain a high yield of dynamic pressure and an almost perfect separation of the unused outlet channel.
  • a single control channel 3 is shown, and then operates by applying a pressure or a vacuum of fluid; a scale provided with two control channels does not, however, depart from the scope of the invention.
  • the diffuser 7 is widened on either side of the axis corresponding to the direction of the jet coming from the nozzle 2, by two recirculation zones 12 and 13.
  • the control 3 is connected directly to the one of these recirculation zones via a conduit 5 of suitable size.
  • This duct 5 opens into the diffuser 7, at the outlet of the jet from the nozzle 2.
  • This configuration allows on the one hand, by creating vortices in these recirculation zones, a greater deflection of the jet, leading to values of the angle ⁇ of the wool 14 close to 45 °, or at least greater than 30 °, and on the other hand a recovery in dynamic pressure at the outlet of the rocker, of the order of 50%.
  • This significant deflection of the jet makes it possible to reduce the distance d to a dimension close to three to four times the width e of the jet.
  • the orifice of the nozzle 2 can be off-center with respect to the axis of symmetry of the diffuser 7, thus favoring an outlet channel (outlet channel 8 in Figure 3), in l 'lack of control pressure.
  • the conventional shape of the recirculation zones 12 and 13, in FIG. 2, constitutes only a particular nonlimiting example of embodiment, in particular the angle of the discontinuity 15 may correspond to any value which must however remain less than or equal at 90 °.
  • This flip-flop also has the advantage that the entrainment of fluid in an unpowered outlet channel is very low, or even zero.
  • the reduction in the distance d reduces the importance of the recirculation vortex in the diffuser 7, which contributes to improving the recovery of the dynamic pressure.
  • FIG. 3 shows an example of a fluid distributor with four outlet channels using three rockers similar to that described in FIG. 2.
  • this type of scale is used in a preferred, but non-limiting, embodiment of the dispenser according to the invention; it in fact makes it possible to obtain a cascading of several fluidic flip-flops due to the large percentage of recovery in dynamic pressure at the outlet of such a flip-flop.
  • a zone 80 comprising divergent walls is provided for each of the output channels 8, 9 of the terminal scales.
  • the purpose of this is to recover in the form of static pressure a fraction of the dynamic pressure of the jet whose velocity profile has been standardized in the part with constant section and determined length of the exit channels 8 or 9.
  • the thickness of the plate in which this dispenser is made depends on the requested flow rate.
  • the material used can be any, for example glass or a plastic material.
  • a plate, not shown in Figure 3, is disposed over the entire surface A 'of this distributor so as to close all' of the fluid lines. This plate will generally be made of a material similar to that used by the body of the dispenser.
  • Figure 4 shows a diagram explaining the control method used for a fluid scale.
  • the device shown in this figure includes pressure transmission means 22 connected to the control 3 of the fluid rocker 21 and to the preferred outlet channel 8 via a connection 24.
  • the fluid applied to the input E, is transmitted to the supply input 1 of the fluid flip-flop 21, by means of a solenoid valve 30 provided with an external control 20.
  • S 1 and S 2 represent the outputs respectively privileged channels 8 and non-privileged channels 9 of the fluid rocker 21.
  • the pressure transmission means 22 comprise a deformable element which serves as an energy reservoir for controlling the rocker 21.
  • a control signal is applied to the solenoid valve 30 via the control terminal 20.
  • the fluid is then transmitted to the fluid rocker 21. Because of its asymmetrical design and in the absence of a transverse control flow, a permanent flow is established towards the preferred outlet channel 8 after a brief speed transient.
  • the preferential outlet channel 8 comprises a diffuser, not shown here, in which the flow recompresses.
  • the level of recompression is determined by the size of the outlet.
  • This pressure is transmitted via the connection 24 to the pressure transmission means 22 which stores this pressure in the form, for example, of potential mechanical energy. If, now, a signal is applied to the control 20 of the solenoid valve 30 so as to interrupt the supply of fluid to the fluid flip-flop 21 for a time interval of supposedly short duration, the re-pressure will cause the change of state of the fluidic flip-flop 21.
  • the pressure transmission means 22 is reset to the reference static pressure in a time interval of duration assumed to be less at '.
  • the absence of vacuum on the control channel 3 will cause flow to the preferred output channel 8.
  • FIG. 5 shows the use of this type of control for an example of a fluid distributor with four outlet channels S 1 , S 2 , S 3 and S 4 .
  • This distributor comprises three bistable fluidic flip-flops, according to an arrangement, such as that shown in FIG. 3, giving an inlet channel E and four outlet channels S 1 , S 2 , S 3 and S 4 .
  • the flip-flops can be of any type in this example.
  • the use of flip-flops of the type of that shown in FIG. 2 constitutes however a preferred embodiment.
  • the device comprises, in addition to the elements already described for the other figures, three flip-flop flip-flops 210, 211 and 212 three controls comprising three pressure transmission means 220, 221, 222.
  • the control channel 4 is closed, as for the example of FIG. 49, or even completely eliminated, as in the example of a flip-flop in FIG. 2.
  • the output channels A, S 1 and S 3 are assumed to be preferential.
  • a second interruption causes the flow to pass through the channels B and S 3 under the effect of the pulse created by the pressure transmission means 220.
  • the pressure transmission means 220 accumulates energy corresponding to the vacuum established on the control channel 3 of the flip-flop 210, so that a third interruption of suitable duration of the supply E, caused by the solenoid valve 30, leaves the fluid jet on the outlet channel B and the outlet channel S 4 is supplied.
  • the re-pressure supplies the channels output A and 8 1 .
  • the duration of the four pulses mentioned depends on the inertia of the pressure transmission means 220, 221 and 222, that is to say on the time which is necessary for them to return to the equilibrium position.
  • Figures 6 to 10 show some non-limiting examples of embodiment of the aforementioned pressure transmission means.
  • the fluid flip-flops shown diagrammatically in these figures comprise at least one diffuser and one outlet 40 on the preferred outlet channel 8 allowing a rise in pressure at the outlet of this channel 8.
  • FIG. 6 shows a device of the manonetric type comprising a volume of air or gas 43 trapped in an inverted U-shaped section of a tube 45.
  • the reserve is initially distributed in a suitable manner between the two branches of the U-shaped section of the tube ; to maintain this sharing and thus have a suitable functioning of the device, it is preferable, but not necessary, to provide a floating ball 41 of diameter roughly equal to the inside diameter of this tube 45 and of average density less than the density of the fluid used and a stop 42 constituted for example by a localized narrowing of the tube 45, preventing the ball 41 from passing from one branch to the other of this U-shaped section of this tube 45 and sealing this fluid, so to limit the rise of the fluid and therefore the siphoning of the tube 45.
  • FIG. 7 shows a device comprising a chamber 46 separated into two parts by a flexible membrane 48 on which is fixed a ballast 47 of suitable value making it possible to produce a sufficient vacuum at the time of tilting.
  • FIG. 8 shows a variant of the device in FIG. 7.
  • the membrane 48 and the ballast 47 are replaced by a bellows 49 possibly reinforced with a helical spring 51.
  • Another variant of the device in FIG. 7 consists in replacing the ballast by a metal frame possibly comprising a magnet and attracted or repelled by a second fixed magnet.
  • FIG. 9 shows a device making it possible to take account of the possible delay in opening or closing the solenoid valve 30. The dispersion over these times inherent in the solenoid valve 30, leads to lengthening the duration of action of the pressure transmission means. The device of this figure 9 makes it possible to synchronize the action of the pressure transmission means. with the re-pressure of the fluid distributor.
  • FIG. 10 shows a variant of the device with two balls 52 of FIG. 9. It has in the chamber 53, a flexible membrane 60 dividing it into two sealed compartments, the first connected to the supply inlet (1) of the rocker, the second connected to the second chamber (46), this membrane being connected by a rod to a valve 61 which, being in the chamber 46, allows good isolation of the latter with the help of the adapted flanges 62 to the valve 61, and a bellows 49 separating the chamber 46 into two parts.
  • valve 61 the operation of the valve 61 is similar to the two-ball device 52 of FIG. 9; the opening of the valve 61 depends on the pressure difference in the conduits 50 and 45 increased by the flexural strength of the membrane 60.
  • a calibrated leak disposed either between the chamber 46 and the pipe 45, or between the chamber 46 and the control pipe 3, allows the bellows to return to equilibrium after a determined time.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP81400028A 1980-01-11 1981-01-09 Strömungsverteiler und seine Anwendung in elektrischen Haushaltsgeräten, insbesondere in Waschmaschinen Withdrawn EP0032472A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8000617 1980-01-11
FR8000617A FR2473653A1 (fr) 1980-01-11 1980-01-11 Distributeur de fluide et son application aux appareils electromenagers plus particulierement du type lave-linge

Publications (1)

Publication Number Publication Date
EP0032472A1 true EP0032472A1 (de) 1981-07-22

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EP81400028A Withdrawn EP0032472A1 (de) 1980-01-11 1981-01-09 Strömungsverteiler und seine Anwendung in elektrischen Haushaltsgeräten, insbesondere in Waschmaschinen

Country Status (3)

Country Link
EP (1) EP0032472A1 (de)
ES (1) ES8203120A1 (de)
FR (1) FR2473653A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5826749A (en) * 1996-02-22 1998-10-27 Nova Controls Multiplexed system for dispensing multiple chemicals to multiple destinations

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1313237A (en) * 1970-11-17 1973-04-11 Philips Electronic Associated Automatic washing machin for example for washing textilefabrics

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845777A (en) * 1973-05-25 1974-11-05 P Gilson Bistable flow control valve
DE2810643A1 (de) * 1977-03-15 1978-09-21 Per Svante Bahrton Zur ermoeglichung einer impulslaengenmodulation des im einen ausgang eines fluidikelements liegenden strahls vorgesehene anordnung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1313237A (en) * 1970-11-17 1973-04-11 Philips Electronic Associated Automatic washing machin for example for washing textilefabrics

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MACHINE DESIGN, Vol. 37, No. 5, 4 Mars 1965, pages 119-123 Cleveland, U.S.A. O. LEW WOOD: "Dithering jet over-comes stiction in a high-speed fluid amplifier" * Figures 1,4,7-9; page 120, colonne de droite, ligne 6 - page 122, colonne de droite, ligne 3 * *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5826749A (en) * 1996-02-22 1998-10-27 Nova Controls Multiplexed system for dispensing multiple chemicals to multiple destinations

Also Published As

Publication number Publication date
ES498397A0 (es) 1982-02-16
ES8203120A1 (es) 1982-02-16
FR2473653A1 (fr) 1981-07-17
FR2473653B1 (de) 1983-10-07

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Inventor name: PAVLIN, CYRILLE