DE1628518A1 - Dishwasher - Google Patents

Description

Annex to the patent and
Utility model registration

ROBERT BOSCH HAUSGERÄTE GMBH, 7927 Giengen, Robert Bosch Strasse

Dishwasher machine

The invention relates to a dishwasher with a spray arm rotating during operation, which is mounted on a stationary, at the same time serving to supply the rinsing liquid is mounted in his, the cavity of the spray arm penetrating wall section openings for the passage of water to the spray arm.

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In known dishwashers, all are in one over the crockery basket located on the spray arm flushed with one and the same jet pressure.

Is the jet pressure chosen so that heavy soiling occurs Plates or pots are rinsed, this pressure is too strong for light parts such as cups or glasses.

In order to avoid damage to these sensitive parts, an opener is used in a known dishwasher Shunt path provided for the flushing water »By opening or closing the shunt path, the water pressure for the spray arm and thus the jet pressure of the nozzles can be changed. After the setting has been made, however, the jet pressure is constant, so that sensitive or hard-to-clean insensitive parts after each setting of the shunt path must be treated in a cumbersome manner in separate operations. Simultaneous treatment of Sensitive parts and heavily soiled, insensitive parts in one operation is not possible.

In another known dishwasher, the sensitive parts are placed on removable baffle plates. This second arrangement is also cumbersome and unsatisfactory.

The object of the invention is to provide a dishwasher create that at the same time sensitive parts and heavily soiled can clean insensitive parts in one operation. 109818/03 22

This task is thereby achieved in a simple manner according to the invention solved ^ "that the openings have different Durchtfittsqunitte and change the jet pressure of the rotating spray arm in sections.

The fact that on the spray nozzles when rotating the spray arm different water pressures prevail is achieved that simultaneously sensitive for each operation of the machine and insensitive crockery items can be arranged side by side with the appropriate jet pressure be treated.

In the drawing, the subject matter of the invention is based on two exemplary embodiments illustrated. Show it:

Fig. 1 is a diagram of a dishwasher with the door open so that the crockery basket with a spray arm arranged below is visible, Pig. 2 the spray arm as a second embodiment after Pig. 1 on a larger scale,

Pig. 3 shows a cross section along line III-III in Pig. 2, Pig. 4 shows a second example of a spray arm in section, FIG. 5 shows a cross section along line V-V in Pig. 4, Pig. 6 shows a schematically illustrated loaded crockery basket and

Pig. 7 is a diagram of the printing process in the nozzles of a spray arm half as a function of Rotation angle.

The dishwasher 1 according to Pig. 1 has a crockery basket 2 and one arranged underneath and rotating during operation

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Spray arm 3. The spray arm 3 is provided with spray nozzles 4, through which the washing liquid exits into the washing chamber.

The spray arm 3 is in the first example after the Pig. 2 and 3 rotatably mounted on a tube 5 open at the top, which serves as a feed tube for the rinsing liquid into the spray arm. That The supply pipe 5 is inserted through a hole in the floor 6 of the washing area from the inside of the washing area and is supported with it a collar 7 on a sealing ring 8 which rests on the floor 6. Under the collar 7, the feed pipe has an external thread 9j on which a nut 10 is screwed, which the Feed pipe clamped tightly to the bottom 6 in a liquid-tight manner. In the interior of the feed pipe is a central one formed on ribs 11 Pin 12 is provided with an internal thread. In this pin 12 is a fastening bolt 13 for the spray arm that extends through the spray arm from above is screwed in, which at the same time serves to guide the rotatable spray arm.

The upper section of the feed tube protruding into the spray arm 5 is closed at the top by the spray arm resting on it and has differently sized diameters distributed over its circumference. Breaks 14 through which the rinsing liquid arriving through the feed tube flows into the two spray arm halves.

In the second exemplary embodiment according to FIGS. 4 and 5, the ^{feed pipe 5 'inserted in the spray arm 3 1} is closed at the top and protrudes with this end through a hole in the upper spray arm wall. On the outside, the feed pipe 5 ^{1 has} a collar 15 on which the spray arm 3 ¹ rests with its lower wall.

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The section of the feed tube stuck in the spray arm has, like in the first example, perforations 14 of different sizes distributed over its circumference for the passage of the rinsing liquid in the spray arm. As shown in FIG. 1, the openings 14 have a larger cross section at the bottom than at the top. By this shape can avoid vortex formation in the spray arm and an advantageous laminar flow can be achieved.

6 shows a schematic plan view of a crockery basket 2, which is loaded with various items of crockery. The orbit of the spray arm located under the crockery basket is divided into 360 degrees. In the example shown, the zone from 0 is at 90 ° with glasses 16, the zone from 90 to 270 ° with heavy plates 17 and the zone from 270 to 360 ° loaded with light plates 18. Above these light plates can be in the zone from 270 to 360 ° in a not shown, Additional basket to be arranged above basket 2. Cups or the like. Be housed.

FIG. 7 shows a diagram, belonging to the loading example shown in FIG. 6, of the pressure profile in the nozzles of a Spray arm half. From 0 to 90 ° there is quite a bit in the nozzles 4 weak pressure, which is achieved in that the opening 14 provided in this section is quite narrow.

Due to the low water flow and the resulting: If the jet pressure at the nozzles is low, the glasses arranged in this zone cannot be damaged. In the zone of

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90 to 270 °, the pressure rises fairly quickly due to the large openings 14 'and maintains a very high level up to 270 ° high value, so that even heavily soiled dishes can be cleaned. The zone from 270 ° to 360 ° is a transition zone in which in the example shown, two smaller openings 14 '* are provided by which it is achieved that the pressure slowly drops to its lower starting value. In this. Area can so lighter, but not quite as sensitive parts can be accommodated. Delicate parts like cups can be in this Zone above the lower washing level in a second additional basket. The jet pressure -is in this second Level already partially degraded by the dishes arranged below, so that damage cannot occur.

In the second embodiment according to Pig. 5 are the different sized openings. 14 are arranged somewhat differently. These different sized openings can be according to the division of the crockery basket in different sizes and Sequence be arranged in the feed pipe 5.

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Claims (1)

Claim Dishwasher with a spray arm rotating during operation, which is rotatably mounted on a stationary tube which is also used to supply the washing liquid and which has openings for the passage of water to the spray arm in its wall section penetrating the cavity of the spray arm, characterized in that the openings (14, 14 ¹ , 14 ") have different passage cross-sections and change the jet pressure of the rotating spray arm (3» 3 ') in sections., » 109818/0322 , Empties