DE3114663C2 - Sieve arrangement in the drain pan of the washing compartment of a dishwasher - Google Patents

Abstract

The invention relates to an arrangement of sieves (14, 15, 16, 18) in the drain pan (11) of household dishwashers, in which the drain pan is shell-shaped and on the bottom with the suction connector (12) of an emptying pump and on the side with the suction connector (13 ) is provided with a circulation pump. On the upper side, the drain pan (11) is covered by a funnel-shaped fine sieve (14) with a large opening angle, which merges in its central area into a sleeve-shaped fine sieve part (15) reaching as far as the suction port (12) of the emptying pump and on the circumference of another sieve tube (16) is surrounded. So that even the finest dirt particles are filtered out when the rinsing liquid is circulated in the bypass flow, the sieve tube (16) is designed as a fine sieve, which is at a distance from the sleeve-shaped fine sieve part (15) from the funnel-shaped fine sieve (14) to the tank bottom surrounding the suction nozzle (12) of the drainage pump (17) extends.

Description

The invention relates to a sieve arrangement in the bowl-shaped drain pan of the washing compartment Dishwasher according to the preamble of the patent claim.

In a known sieve arrangement of this type (FR-PS 13 82 742) is disposed the Feinsiefe / ear gt.neinsam with the coarse screen inserted therein in a screen whose screen hole cross-section greater s j of the Feinsiebrohres is. The disadvantage of this sieve arrangement is that the fine sieve tube is not automatically cleaned when the washing compartment or the drain pan is emptied.

From DE-OS 28 32 084 a sieve arrangement is known, which is used to adjust the sieve hole cross-section in addition to a first fine sieve, a congruent second fine sieve which is opposite the first sieve is adjustable and together with this forms a sieve unit. This is intended to be particularly finely distributed Dirt can be filtered out of the flushing liquid. However, the known arrangement is disadvantageous in that the intended adjustment of the two fine sieves against each other requires an additional control element power. In addition, the screen arrangement is largely ineffective if the two screens are not extraordinary Exactly shaped and not made congruent with regard to the sieve holes and in the drain pan the machine are arranged.

DE-OS 26 57 764 also includes a Siebanordniing to the prior art, the only one, the drain pan covering and funnel-shaped There is a fine sieve and a coarse sieve insert passing into a central cylinder.

In the known sieve arrangement according to DE-OS 26 56 557 is to the covering the drain pan Fine sieve directly connected to a cylindrical fine sieve with a coarse sieve insert. The cleaning cycle will the fine sieve tube clogged by the loosened dirt particles after a relatively short time and forms for the Water inflow to the circulation pump a large flow resistance. The sieve arrangement behaves similarly according to DE-OS 24 51 822. In this arrangement, too, the fine filter covering the drain pan goes into a cylindrical fine filter, with an additional one only to collect coarse dirt particles Coarse filter is present

The invention is based on the object of a failure-prone, To create an effective sieve arrangement that also filters out particularly fine dirt particles from the rinsing liquid is suitable without reducing the flow resistance to the circulating pump of the machine to increase significantly, and which cleans itself automatically when the rinsing liquid is pumped out

This object is achieved by the features characterized in the claim. Since the fine sieve in each case only part of the circulating rinsing liquid is passed through, the flow resistance is the The screen arrangement for the circulation pump is relatively small, although the filtering out of particularly fine dirt particles is possible The fine sieve around the fine sieve tube forms a bypass filter, which causes that in the intermediate and final rinse phases, the fine food residues remaining in the liquid cycle are filtered out will. On the other hand, the ultra-fine sieve is arranged in the bypass in such a way that pre-rinsing in the rinsing phases and cleaning the water inflow to the circulation pump through the fine screen is not hindered to the same extent is that the spray pressure drops so far that there is no more food sticks. When emptying the fine sieve and the fine sieve are automatically cleaned by the changed liquid flow the fine dirt particles deposited on the fine sieve the fine sieve to the connection piece of the drainage pump can happen.

An embodiment of the invention is explained in more detail below with reference to the drawing, which is in vertical section the drain pan of a dishwasher with a fine sieve shows its fine sieve tube from is surrounded by a fine screen

The otherwise not shown washing container of a household dishwasher goes in the middle of his Bottom 10 into a bowl-shaped drainage trough 11, to the bottom side of the suction nozzle 12 a drain pump and the side of the suction port 13 is connected to a circulation pump. Upside is the drain pan 11 is covered by a funnel-shaped fine sieve 14 with a large opening angle. This fine sieve 14 goes in its central area into a suction port 12 of the drainage pump reaching fine sieve tube 15 over. On the circumferential side, the fine sieve tube 15 is on a further sieve tube 16 surrounded, which is designed as a fine sieve. This fine sieve tube 16 extends at a distance from the fine sieve tube 15 and extends from the funnel-shaped fine sieve 14 covering the drain pan 11 to the suction nozzle 12 of the emptying pump surrounding tub bottom 17. In the illustrated embodiment, the fine sieve tube 16 is in the shape of a circular cylinder educated. The fine sieve tube should be arranged at a distance around the fine sieve tube, so that versions with cylindrical or funnel-shaped fine or fine screen tubes are possible and thereby the desired shunt effect of the fine sieve is retained. In the upper section of the fine sieve tube 15, a removable, pot-shaped coarse sieve 18 with a handle 19 is inserted

When the circulation pump is in operation, the flushing liquid flows in accordance with the arrows shown Intake manifold 13 closed. The majority of the rinsing liquid takes the path according to the arrow

31 14 663
3 4 5
10 len 20 through the funnel-shaped fine sieve 14, which
coarse and fine particles of dirt from the liquid too
retains These dirt particles migrate into the fine sieve
pipe 15 and are partly stored in the intake port 12
the drain pump. Blocking the duck
coarse dirt residues causing the pump who
retained in the coarse sieve 18.
On the other hand, part of the rinsing liquid takes corresponding
according to the arrows 21 its way through the coarse sieve 18,
the fine sieve tube 15 and the fine sieve tube 16. Here
coarse dirt particles from the coarse sieve 18, fine
Dirt particles from the fine sieve tube 15 and the finest dirt
parts of the fine sieve tube 16 retained. 15th 1 sheet of drawings 20th 25th 30th 35 40 45 50 55 60 65

Claims (1)

Claim: Sieve arrangement in the bowl-shaped drain pan of the washing compartment of a dishwasher, with a drainage pump on the bottom side of the drain pan and a circulation pump on the side are connected and the sieve arrangement consists of a large, funnel-shaped fine sieve, that covers the drain pan and into a tubular, above the suction port of the drain pump The end of the sieve merges into which a sieve with a different sieve hole cross section is added is inserted removably, characterized in that the large-area fine sieve (14) connected sieve tube (15) is also designed as a fine sieve and in the same a coarse sieve (18) is inserted and that at a distance concentrically around the fine sieve tube (15) a fine sieve tube (16) is arranged *, which is from the overlying, the fine sieve (14) covering the waste tarpaulin (11) extends to the tub bottom (17) surrounding the suction nozzle (12) of the drainage pump