DE20014038U1 - Spray device for a dishwasher - Google Patents

Description

:: : ga-i999/084

' *' . Hl/Re

15.08.2000

AEG Hausgeräte GmbH D-90429 Nuremberg

Description ,

Spray device for a dishwasher

Spray devices for dishwashers consist of a spray arm that is rotatably attached to the water supply pipe, the so-called connecting pipe.

The water jet is fed into the spray arm via the connecting pipe at the end of which is the water inlet. Outlet nozzles are distributed over the spray arm through which the water or cleaning fluid is sprayed onto the dishes in the dish rack. In order to reach all the dishes, the spray arm is set in rotation. This rotation of the spray arm around the axis of the water inlet is usually achieved via one or more drive nozzles that are located on the periphery of the spray arm and generate a water jet essentially tangentially against the direction of rotation of the spray arm.

In conventional spray devices for dishwashers, the drive nozzles provided on the periphery are disadvantageous because the water emerging from them is essentially only needed to drive the spray arm and is not available for cleaning the dishes.

Particularly in pulse mode, i.e. in the operating state in which water is sprayed at relatively high pressure for only a very short time, conventional spray devices have the disadvantage that hardly any rotary movement occurs via the drive nozzles because the water pulse has already subsided before the rotary pulse has become properly effective.

^# * *&iacgr; ^: GA-1999/084

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Hl/Re 15.08.2000

The object of the present invention is to provide a drive for a spray arm so that the conventional drive nozzles can be dispensed with completely or at least partially and almost all of the water can be used for cleaning.

This object is achieved by a spray device for a dishwasher comprising a spray arm which is rotatably attached to a water inlet, wherein the water inlet has turbine blades.

An advantageous embodiment of the invention consists in the fact that guide vanes (LS) are mounted in the spray arm.15 This allows the efficiency with regard to the angular momentum to be further increased. __ ·. . .

In addition, the spray arm can also have drive nozzles, which can advantageously be smaller than before.

An embodiment of the invention is described below with reference to the drawing.

Figure 1 is a sectional view of a spray device. Figure 2 is the top view according to Figure 1.

The illustration in FIG. 1 shows a section through a spray device of a dishwasher, which consists of the connecting pipe VR and the spray arm SA. The spray arm SA is mounted via a plain bearing GL so that it can rotate around the water inlet WE, which is usually angled perpendicularly from the connecting pipe VR.

GA-1999/084

Hi/Re

15..08.2000

Water is pumped into the spray arm SA in the direction of the arrow via the connecting pipe VR at the end of which is the water inlet WE. Distributed over the spray arm SA are cleaning nozzles RD by means of which the water or cleaning liquid is sprayed onto the dishes in the dish basket. The rotational movement of the spray arm around the axis A of the water inlet nozzle WE is conventionally implemented via one or more drive nozzles AD, which are located on the periphery of the spray arm SA and generate a water jet against the direction of rotation of the spray arm SA.

According to the invention, turbine blades TS are provided in the area of the water inlet, in which the water is sprayed into the spray arm SA, which are also shown in the plan view according to FIG 2. '

In the following, the fixed blades of the water inlet WE are referred to as turbine blades TS and the blades in the spray arm SA which rotate relative to the turbine blades TS are referred to as guide blades LS.

The turbine blades TS are curved here, but can also have a different shape. The expert

Turbine technology provides appropriate suggestions for the design of the blade shapes for optimized operation. This also applies to the guide vanes LS. The only important thing is that the blades LS, TS are shaped in such a way that the water flowing into the spray arm exerts a torque on the

the spray arm produces. . ' _ ■

In the illustration according to FIG 2, curved arrows indicate how the cleaning fluid flows between the door

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GA-1999/084 .:.'..· '.. .· . ·· ·· Hl/R

15.08.2000

turbine blades TS. Since the turbine blades TS are stationary, the water is pressed against the guide vanes LS located in the spray arm SA, so that a torque is generated in the direction of rotation DR indicated by the arrow.

..5 is generated. The LS guide vanes are not necessarily provided, since a torque can also be generated via the side walls of the spray arm. However, they improve the angular momentum accordingly. Instead of the curved LS guide vane, straight guide vanes or differently shaped LS guide vanes can of course also be used.

Of course, drive nozzles AD can also be provided, although these can usually be dimensioned much smaller than is the case with conventional spray devices. Depending on the design of the spray device and the spray arm, the drive nozzles* may be completely unnecessary. ;

Claims (3)

1. Spray device for a dishwasher, consisting of a spray arm (SA) which is rotatably attached to a water inlet (WE), the water inlet (WE) having turbine blades (TS). 2. Spray device according to claim 1, characterized in that guide vanes (LS) are mounted in the spray arm (SA). 3. Spray device according to one of the preceding claims, wherein the spray arm (SA) has drive nozzles (AD).