DE7246024U - DEVICE WITH ELECTROMAGNETIC CONTROL FOR MONITORING THE WATER LEVEL IN WASHING MACHINES - Google Patents

Description

iPÄTCENTAMWALTSÖRO TlEDTKE - BOHLING - KlNNE

TEL. 10811) 539653-56 TELEXt 524 845 tipat CABLE ADDRESS: Germaniapatent Munich

8000 Munich 2 Bavariaring 4 15. ne ζ embe r 1972 P.O. Box 202403

ELBI S.p.A.

Regina Margherita-Collegno Turin (Italy)

"Device with electromagnetic control for monitoring the water level in washing machines"

The invention relates to the problem of controlling the Water level in washing machines (washing machines for laundry or dishes), which is intended to prevent any damage the water overflows from the washing tub or comes out of the machine.

With automatic washing machines that are constantly connected to the water pipe network the filling of the washing tub to a predetermined level can be obtained by opening the inlet electrovalve, the

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Let water run in or interrupt the flow with a pressure switch connected by the effect of hydrostatic pressure due to the water level causes the solenoid valve to close. With other systems the solenoid valve is timed and in this case the program setup operates the closing of the inlet solenoid valve after a predetermined, Time calculated in such a way that the water reaches the desired level if the delivery rate is precisely adhered to.

However, damage to the aforementioned components can occur, as a result of which the water supply is not interrupted in time, which can lead to flooding.

The failure of the input electrovalve can, apart from electrical Damage, diaphragm rupture or incorrect operation of the sealing element or the clogging of the bore, which is provided in the membrane.

On the other hand, the pressure switch can fail, which is why the solenoid valve does not operate if the through hole is clogged by dirt or rust from the pipe, or the error can be caused by shifting the calibration exist too far upwards, or else in the perforation of the membrane or in losses in the line between the air trap and the sealed chamber of the pressostat.

When the solenoid valve is controlled by the programmer and if timed, the overflow of the liquid may be due to damage to the timer which was not set in advance Time the power supply to the electrovalve is interrupted, or for poor functioning of the feed regulator inside the electrovalve, which allows a larger amount of water to flow through, or for damage to the electric valve, as mentioned.

: The purpose of the novelty is to remedy these disadvantages, whereby a con-

partial facility is created, which is independent of the failure possibility

] possibilities of the individual components and which is able to

interruption of the water supply when a predetermined level is reached to enable, regardless of the good or bad radio

tion of the other components.

Another task of the innovation is the creation of a control device of the aforementioned type that can be used to start up the machine instead of the traditional pressostat.

Another object of the invention is to create a control device of the aforementioned type, which apart from the simple and robust design and the precise and safe functioning has a very small footprint and easily between the tub and the housing of the washing machine can be accommodated.

The main feature of the water level control device after the innovation lies in the fact that a water inlet valve is provided, which has two sealing elements working in series, which are connected by two separate parallel-connected Electromagnets are controlled in a uniform circuit, in which the program facilities are also available as well as a Microswitch controlled by a float in an auxiliary tub, which is attached to the side of the main tub and goes through with it an opening is in communication, which is at the height of the maximum permissible water level, wherein the aforementioned microswitch is closed is while the machine is working normally, so that the opening or closing of the timer - program switch at the electromagnets the two closing elements becomes effective; a rise in the water in the tub lifts the float and causes the microswitch to switch, which interrupts the flow of current to the two electromagnets

and thus causes the two sealing elements to close at the same time, and so interrupts the running of water into the tub.

Further features and advantages of the innovation emerge from the following Description of the embodiments shown in the accompanying drawings. Here are:

1 shows a schematic side elevation view in partial sectional illustration with the function of a device to control the water level in washing machines according to the innovation,

Fig. 2 is a side elevation drawing on an enlarged scale with partial Sectional view of the double valve of the device,

Fig. 3 is a cross-sectional view of the main organs of the device, Fig. 4 is a longitudinal section along the line IV-IV of Fig. 3, and Fig. 5 is a longitudinal section of the microswitch of the device.

1 is the washing tub of a washing machine (for dishes or laundry), where the water inlet pipe is controlled by a double solenoid valve 2, which is connected to a program device 13 and a Microswitch 14, which is part of the control part according to the innovation, which controls the water level in the tub.

As shown in FIG. 2, the double valve 2 has a single body 3 on, the top has a threaded inlet nozzle 4, which is via a pipeline 5 is in communication with a first chamber 6, which in turn is in communication with a second chamber 7, which is flush with a discharge nozzle 8 is connected. The pass between the said, in series

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one below the other arranged chambers is made by two deformable membranes 9 and 10 controlled, which are known per se and with stiff support luminaires are connected, the control being carried out by two separate electromagnets 11, 12. When the electromagnets are in the rest position, the two are The diaphragms are held in the closed position by the water pressure, while in the excited state the diaphragms are removed from the corresponding valve seats Loosen and let water run from the inlet connection 4 to the outlet connection 8. The use of two separate series of solenoid valves reduces the Flooding hazards due to solenoid valve damage, because if one valve fails the other will remain in effect and it is very unlikely to that both fail at the same time.

The windings of the two coils are connected in parallel and are used by the Time delay 13 of the program switch controlled, with a microswitch 14, which in turn is controlled by a float, interposed is.

In correspondence with the maximum water level in the washing tub 1 is a lateral Opening provided in the same, to which a body 15 is applied, which is preferably molded from plastic material; the said body forms an auxiliary trough which has a threaded connector 16 at the side, which is inserted into the opening provided in the wall of the washing tub is and is tightly connected to this wall by means of an external seal 17 is attached and leash threaded sleeve 18, which also acts as a coarse filter. A line filter 19 is provided inside the sleeve, to hold back the foreign bodies with reduced dimensions.

The connecting piece communicates with the inner cavity of the tub body 15 a channel 20; the body 15 is internally provided with protrusions 21 and has at one end a console-shaped appendix 22, on one side wall 22a of which the microswitch 14 is provided, which is on a pin

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23 rests, which allows the switch to swing back and forth, with a screw 24 is guided in a curved sleeve 25 of the wall. This makes it possible to mikrometriech the position of the microswitch as a function of set the water level at which you want the action of the device.

The aforementioned microswitch is provided with a control lever 26 which extends towards the tub 15 and at its end has a float 27 which is connected to the lever by reinforced solid pins 28, 29 ; the float lies in the rest position on the lower protrusions 21 of the tub

The lever 26 acts on a control switch 30, which in turn is able to provide a rapid oscillation of the movable switch member to effect 31 of the micro switch so as to cause the electrical connection between the contacts AB in the rest position to the position of AC in the working position.

If the machine is functioning normally, i.e. with the float lowered, the Mu-roswitch is arranged so that the contacts A and B in are electrical connection, which is why the current can reach the electromagnets 11, 12 of the double electrovalve and the water flow enables. If for any reason the water in the tub rises above the predetermined value and reaches the auxiliary tub 15, the float rises and triggers the switching element 31, which interrupts the flow of current between contacts A and B, whereby the two electromagnets which cause the two sealing elements 9, 10 to close. This is how the water inlet into the tub interrupted and the danger of flooding averted. The functioning of the float device gives maximum reliability, at least a larger one than the electrical components on which the water level control is normally based.

11/17/77

The aforementioned microswitch can possibly be the pressostat for actuation of the machine for initiating the work cycle, using the third contact C in this case. However, it is necessary that the microswitch does not return to the initial position when the lever something shifts in the opposite direction: at the beginning of the work cycle the pump lowers the water level in the machine slightly and this lowering must not be sufficient to switch the microswitch to effect or to return it to its normal operating position, which is to prevent additional water from running into the warning.

Of course, without prejudice to the principle of innovation, the embodiment
and the construction details are changed in the broadest sense of what has been described and illustrated without departing from the scope of novelty.

Claims (6)

Sayings: 1. Control device for the water level in washing machines, characterized in that there is an inlet water valve (2) with two sealing elements (9,10) which work in series and are controlled by two separate electromagnets (11, 12) which are parallel in one work unitary circuit, which also includes the program device (13) of the machine and a microswitch (14), which is controlled by a float (27) in an auxiliary tub (15), which is arranged laterally next to the main tub (1) and communicates with this via an opening that is at the height of the maximum permissible water level. The said microswitch is closed as long as the machine is functioning normally, in order to effectively activate the opening and closing controls of the timer - program switch via the electromagnets of the two sealing elements obtain; the rise of the water level in the tub causes the float (27) to rise and the microswitch to switch, which interrupts the flow of current to the two electromagnets, which means that the two sealing elements close at the same time, thus preventing further water inflow. 2. Apparatus according to claim 1, characterized in that the microswitch (14) has three contacts (A, B, C), two of which are included in the circuit of the electromagnets of the double solenoid valve and the third is used to initiate the machine's duty cycle. ί 3. Device according to claim 2, characterized in that the mi ] micro switch is designed so that the stroke of the lever that opens the ; opening and closing of the contacts, what is to be avoided is very great is intended to ensure that when the pump starts up, the - 2 - 11/17/77 • 111 ' ¹ ' _f t Water level in the tub, the renewed closing of the contacts and the causes further inflow of water into the tub. 4. Apparatus according to claim 1, characterized in that the mi crowitch is mounted on a support member, which is connected to the auxiliary tub (15) is firmly connected so that the angular position can be regulated and accordingly precisely the point can be set at which the water level development in the tub is affected. 5. Apparatus according to claim 1, characterized .ge characterized, that the auxiliary tub (15) is provided with a threaded connector (16) which is suitable for inserting into the lateral opening of the tub (1) to be introduced and onto which a threaded sleeve (18) is screwed to attach the auxiliary tub (15) to the tub To attach washing machine. 6. Apparatus according to claim 5, characterized in that the threaded sleeve (18) which the auxiliary trough (15) on the Wash tub (1) attached, has a perforated surface, which acts as a coarse filter and in that a filter (19) is arranged inside the connector (16) which does the job has to hold back foreign bodies of small dimensions.