DE8503434U1 - Level control device - Google Patents

Description

EBHZ-81/27 - 3 - 6.2.1985

L i c e η t i a

Patent-Verwaltungs-GmbH Frankf u rt / M si η

Level control device

The innovation concerns a level control device according to the preamble of

Claim 1. 1

In a known level control device of this type (DE-OS 29 07 269) |

a control chamber separated from a feed vessel by a partition, |

wherein the upper edge of the partition forms an overflow edge and the |

Inlet vessel in the lower area communicates with a container in which a |

certain water level is controlled. This level is by the height |

the overflow edge of the partition is determined. The control chamber is a |

Air trap chamber assigned, at the outlets of which pneumatic switches |

are connected. If the level rises in the feed vessel and thus in the |

connected container above the level of the over rl on edge, then flows liquid |

over the overflow edge into the control chamber and builds a

of the liquid level in the control chamber. This increases the f

Pressure in the air trap chamber very quickly to a value that is one |

Allows normal level switch to respond. This is a by a §

Electromagnet controlled valve closed, which in the water inlet away to the i

Container lies. If this valve or the associated normal level | fails

switch, then generates the water that continues to flow in the air trap |

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EBHZ-81/27

6.2.1985

chamber 10 an increased pressure, which a safety level switch can address. In this way, a further solenoid valve, preferably installed on the tap, can be closed and / or one of the container in a Washer or dishwasher assigned emptying pump switched on will . The effort for pneumatic pressure switches and an electromagnetically controlled valve is relatively expensive.

The innovation is based on the task of a level control device according to the preamble of claim 1 to take measures that allow a simplified control of the water supply to the container.

The solution to this problem is carried out according to the innovation by the characterizing Features of claim 1.

In a construction of a level control device according to the invention can thus an attached diaphragm valve can be controlled directly, which controls the supply to the container. There is no need for any electrical components to be controlled and no pneumatically operated electrical switching means to be provided.

The innovation is shown below with reference to the drawings of exemplary embodiments explained in more detail.

It shows: FIG. 1 FIG. 2

Figure 3

Figure 4 Figure 5

a level control device with an attached membrane valve, an additional electro-optical control device on the level control device according to Figure 1,

an electrical switching device controlled by the magnet in the float,

a switching device controlled directly by the float and a switching device controlled directly by the float in cross-section.

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EBHZ-81 / 27-5 - 6.2.1985

In the case of a level control device according to FIG. 1, a feed vessel 1 protrudes a connection piece 2 in connection with the washing container of a dishwasher or washing machine. The feed vessel 1, which is open at the top, assigns an adjacent control chamber 3 towards a partition 4, the upper edge of which 5 is lower than the free edge of a ventilation opening 6. The overflow edge 5 determines the level indicated at 7 by its height, up to which the liquid level should rise. In the opposite of the overflow edge 5 recessed control chamber 3, which is designed as a vertical pipe section, there is a float 8 on which a permanent magnet 9 is provided. The permanent magnet 9 lies within the float 8 on its bottom and is thus protected against wetting with liquid. Of the Permanent magnet 9 has a central opening through which a hat-shaped indentation 10 of the housing of the float 8 extends. That The lower end of the control chamber 3 is opposite one directly to it adjoining valve chamber 11 is divided off by a partition wall 12, which has a hollow cone-shaped recess 13 that engages coaxially in the recess 10 having. Within the formation 13 there is a guide shaft 14, which has a control cone 15 at its end protruding into the valve chamber 11. The opposite end of the shaft 14 supports a compression spring 16, which on the other hand rests against the closed bottom of the formation 13. The guide shaft 14 and possibly the control cone 15 are made of soft magnetic material and are seated on the partition wall 12 The float 8 is raised into the raised position shown by the force of the permanent magnet 9. In this position, the control cone 15 is with Distance from a control bore 17 in the reinforced part 18 of a membrane © he reinforced part 18 of the membrane 19 is parallel to the free edge of a Drain connection 20 wherein the free edge of the drain connection 20 in an inflow chamber 21 protrudes into which a feed line 22 for water opens. The outlet connection 20 opens into the container, not shown, whose filling level is to be controlled. Between the valve chamber 11 and the inflow chamber 21 is located outside the reinforced part 18 in the membrane 19 Compensating bore 23. From the control chamber 3 leads in the rest of the area

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EBHZ-81/27 - 6 - 6.2.1985

a suction lifter 24 away from the partition wall 12, via which into the control chamber 3 inflowing liquid can be sucked off.

The solenoid valve arranged below the control chamber 3 is located in the position shown in the open state, so that liquid through the Zuiaufleitung 22 directly into the outlet nozzle 20 and thus into the can flow into the filling container. When the liquid level in the container reaches the level indicated at 7, the liquid flows over the Overflow edge 5 into the control chamber 3. This makes the float 8 raised, whereby the magnet 9 is removed from the control cone 14, 15.

As a result, the pressure exerted on the control cone 14, 15 by the permanent magnet 9 decreases magnetic force and the spring 16 presses the control cone 15 into the Control bore 17 of the membrane 19 a. By closing the control bore 17, the overflow opening 23 builds up in the valve chamber 11 an increased pressure which presses the membrane 19 with the reinforced part 18 onto the free edge of the drain pipe 20. The control bore 17 opens at the same time into the drain pipe 20. When the diaphragm valve is closed, the further inflow of liquid into the container is also prevented. Will after In the course of a work process in the container, the liquid contained therein is pumped out, then the siphon 24 also removes the liquid in the control boom 3 removed liquid. As a result, the float 8 with the magnet 9 sinks onto the partition wall 12 and the magnet 9 pulls through its force the control cone 14, 15 back up into the position shown. As a result, the control bore 17 is opened, so that a pressure equalization with respect to the Valve chamber 11 is possible. This pushes the prevailing in the inlet line Pressure of the liquid from the membrane 19 with its reinforced part 18 from the edge of the drain pipe 20, so that a renewed flow of liquid into the container is possible. The one assigned to the level control device Diaphragm valve is therefore particularly suitable as an additional safety valve, if a solenoid valve, which is connected upstream of the feed line 22 and controlled by the program switch, becomes leaky or inoperative.

EBHZ-81/27 - 7 - 6.2.1985

At the top of the float 8 there is a plunger 25, which also a control switching device 26 can operate. According to FIG. 4, this switching device has a control lever 27 which is actuated by the plunger 25 is actuated and the free end of which actuates a microswitch 28. Of the However, the plunger 25 can also act directly on the snap control element, as shown in FIG 29 of the snap switch 28 act.

Furthermore, on the float, a reflective surface 29 and on the Wall of the control chamber an optocoupler 30 can be attached. Increases the float 8 reaches the level in the container, then the reflective surface 29 designed as a mirror arrives in the beam path between a light transmitter 31 and a light receiver 32 of the optical coupler 30.

However, it can also be magnetically closed on the wall of the control chamber 3 actuating switch 33 are attached, when floating the float 8 with the magnet 9 by the magnetic force of the magnet 9 is operated.

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Claims (7)

I ι ι ι · · · tilt ■ till III 11 ■ Il Il 1111 ti 111 EE3HZr81 / 27 - 1 - 6.2.1985 Bt / wl L i c e η t i a Patent-Verwaltungs-GmbH Frankfurt / Main claims 1. Level control device, especially for washing machines or dishwashers, with an over- j iaufkante to which a spatially deeper control chamber is assigned, characterized in that in the control chamber (3) a float (8) in the height is guided freely adjustable that with the float (8) a magnet (9) is connected that the magnet (9) separated by a partition (12) a control cone (15) is assigned which is adjustable against the force of a spring (16) and that the free end of the control cone (14, 15) in the adjustment path the control bore (17) of a diaphragm valve (11, 19, 21) is that lies in the liquid feed path to the container. 2. level control device according to claim 1, characterized in that the Magnet (9) is arranged in the cavity of the float (8). 3. Level control device according to claim 1 or 2, characterized in that the magnet (9) has a central opening which is penetrated by a hat-shaped indentation (10) of the float - (8), that the partition (12) has a hollow pin-shaped formation ( 13), which is coaxial with the recess (10) and that a guide shaft (14) of the control cone (15) is displaceably arranged within the recess (13). II itt * II ·· ιιιιιι (•! 111 I I I I I I I II 1111 Il til ΕΒ_ΗΖ _Γ 81/27 - 2 - 6.2.1985 4. Level control device according to claim 1 or one of the following, characterized characterized in that the spring (16) is arranged between the guide shaft (14) and the closed end of the formation (13). 5. level control device according to claim 1 or one of the following, characterized characterized in that a push rod (25) is visible on the float (8), a switch (26) is located in the adjustment path. 6. level control device according to claim 1 or one of the following, characterized characterized in that a mirror (29) is arranged on the float (8), which is in the radiation path between a light transmitter (31) and a light receiver (32) is adjustable. 7. level control device according to claim 1 or one of the following, characterized characterized in that a magnetic switch (33) is arranged next to the adjustment path of the magnet (9).