SE457916B - LEVEL REGULATORY AND SAFETY DEVICE FOR DISC AND WASHING MACHINES - Google Patents

Description

40 457 916 2 and thereby transfers the shut-off valve to its open position. In order to also detect leaks in the machine, at the bottom side of the machine a leakage water collecting trough is arranged with a float arranged therein, which is directly connected to the diaphragm of the shut-off valve pressure box in such a way that in case of leaking water the raised float via the diaphragm .

The invention is based on the task of designing a level control and safety device of this kind simpler. J This task is solved by the features specified in claim 1.

Since, according to the invention, the mechanically non-magnetically operated shut-off valve is arranged for regulation, -perm- level- while the controlled water supply-electromagnetic valve, which can be switched for time bridging, forms the safety part, can without adversely affect the accuracy of level control or overfill safety. of the tub the overall device is considerably simplified, since the second air drop chamber for safety level, with overflow edge and suction siphon as well as the operating level monitor - its function according to the invention takes over the pressure box of the shut-off valve - with its contacts and connections.

Advantageous embodiments of the invention are set out in claims 2 and 3.

The invention is explained in more detail below with the aid of an exemplary embodiment shown in the drawing. Fig. 1 shows a functional diagram of a dishwasher equipped with the level control and safety device according to the invention, and Fig. 2 shows in detail the level control vessel connected between the bottom and the shut-off valve with air drop chamber, overflow edge and suction siphon.

From the dishwasher only partially shown, in the bottom of the tub 1 an outlet trough 2 is arranged, shown emptying and a circulation pu for the storage container S, n 6 arranged by a salt container 3 and a softening device, leading to salt containers, to which a non-mp is connected . Upper ion exchanger 4 consisting of one at the vessel side wall from the bottom of which an outlet conductor. The dishwasher is connected via a water supply solenoid valve 7 to a water supply line 8.

From the water supply electric 10 15 20 ZS 30 35 40 457 916 the solenoid valve 7 leads a fresh water line 9 via a free flow section 10 present in the storage container S and a raw water valve 18 to the ion exchanger 4, from which a line 11 is branched to the outlet trough 2. From a overflow drain 12 of the storage container 5 leads a pipe connection 13, 11 to the tub.

In the exemplary embodiment shown, the salt container 3 has a closable filling sleeve 14 and an aeration hose 15 and in the connecting line 16 to the ion exchanger 4 there is a regeneration valve 17. For monitoring a normal filling level 19, at the vessel 1 or its outlet trough Z by means of a sleeve 20 a level control vessel 21 connected, which has an air drop chamber 2% a housing chamber 23, a partition wall 24 with an overflow edge 25 lying at a height above the normal filling level and an air drop chamber emptying suction siphon 26.

The air trap chamber 22 is connected via a control line Z7 to a shut-off valve 28, which is arranged after the water supply solenoid valve 7 in the water supply line 8 and is described in more detail in DE patent specification 31 14 664.

The level control and safety device works as follows: During trouble-free operation of the household appliance, the shut-off valve 28 is open through its permanent magnets. The water supply in the tank 1 takes place by opening the water supply electromagnet valve 7 switched by the program control. When the normal filling level 19 is reached, the level control vessel 21 in the communicating connection thus leads to an overflow of a small amount of water. over the overflow drain edge 25 in the air fall chamber 22. A small amount of water is sufficient to build up in the air fall chamber 22 a pressure which via the control line 27 affects a pressure box 29 of the shut-off valve 28 in such a way that the shut-off valve is transferred to its closed position and blocks the further supply of water.

The water supply solenoid valve 7 connected via a time link of the device control is also closed after the lapse of its predetermined opening time.

During the emptying of the tank and / or after the connection of the circulation pump, the water level is lowered and the suction lever 26 can start for the emptying of the air drop chamber 22, whereby the pressure effect of the pressure box 29 is built up and the shut-off valve 28 is transferred back to its open position. Due to this mode of operation of the mechanically-permanently mechanically operated shut-off valve, a fastening of the valve is prevented. In addition, depending on the design of the level control vessel and the opening time of the water supply solenoid valve 7 after the start of the circulation pump, when the shut-off valve 28 is reopened, a dynamic filling of water is possible in the vessel.

If due to a disturbance, e.g. clogging of the level control vessel or strike of the pressure box, the water supply to the tank is not interrupted when the normal filling level 19 is reached, then water flows to the tank as long as the opening time of the water supply electric solenoid valve 7 allows.

This opening time is so adjustable that in the event of a safety event, the tank is only insignificantly filled above the normal filling level. In order to also be able to check for leaks in the tub or at the other water-conducting parts of the household machine by means of the level control and safety device, leakage water can be collected in a collecting trough on the bottom side.

A float is arranged in the collecting trough, which is so interconnectable with the pressure box 29 of the shut-off valve 28 that it causes the shut-off valve to close even with a small amount of leaking water in the collecting trough.

Instead of the overflow drain edge 25 of the partition wall 24, the partition wall can be designed raised and the bottom 30 of the suction siphon 26 is arranged at the level height for the normal filling level 19 and at the same time at the water inflow into the tank 1 take over the function of the overflow drain edge.

Claims (3)

10 15 20 25 30 5 457 916 P e v Level control and safety device for dishwashers and washing machines, with a shut-off valve connected in series with the programmed water-to-solenoid valve, which holds a permanent magnet in the open rest position and which can be closed by a pressure box which is connected to a liquid level in the vessel of the machine monitoring, via a overflow edge lying on the liquid level and fillable through a suction siphon emptying air fall chamber, characterized in that the shut-off valve (28) through its pressure box (29) can be closed when a normal filling level (19) in the tub (1), that by means of a time link in the program control device an opening time of the water inlet solenoid valve (7) is stored, which is adapted for a water flow filling at least the tub to the normal filling level (19), and that after During the opening time determined by the time link, the water inlet solenoid valve is also closable, in order to counteract a clogging of the check valve (28). Device according to Claim 1, characterized in that in the case of a membrane of the pressure box (29) a float arranged at least in a leakage water collecting trough of the machine is directly linked and by the leakage water occurring the float membrane membrane and the pressure box are communicated. of the shut-off valve (28) closing bar. Device according to claim 1, characterized in that the bag (30) on the suction siphon (26) arranged for emptying the air filling chamber (22) is arranged at the level height of the normal filling level (19) in the tub (1) and at the same time forms the spout drainage edge. for the filling of the air fall chamber.