WO2007074024A1

WO2007074024A1 - Dishwasher

Info

Publication number: WO2007074024A1
Application number: PCT/EP2006/069224
Authority: WO
Inventors: Johannes BÜSING; Daniel Delle; Gerhard Fetzer; Peter Geissler; Norbert Gerstner; Hubert Groll; Mathias Herrmann; Dieter Hotz; Stefan Kasbauer
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2005-12-27
Filing date: 2006-12-01
Publication date: 2007-07-05
Also published as: DE102005062480A1; DE102005062480B4

Abstract

A description is given of a dishwasher with a continuous-flow heater (7) through which dishwashing liquor, delivered by a recirculation pump (14), and the air for drying the crockery, which is delivered by a fan (18), flow alternately. A diverter (10) is connected to the outflow side (9) of the continuous-flow heater (7), one arm (13) of this diverter being connected to the recirculation pump (14) and the other arm (16) being connected to the fan (18).

Description

Description Dishwasher

The invention relates to a dishwasher, in particular domestic dishwasher, comprising a washing container for receiving items to be washed, a pump for circulating the rinsing liquor, a fan for circulating drying air for the dishes, a water heater, the alternative funded by the pump Rinsing fluid or through the air supplied by the blower for drying crockery can be flowed through with the same flow path, a switch and an arm of the switch is connected to the blower.

There are known dishwashers in which in a conventional cleaning cycle of the dishwasher first heated rinsing liquor supplied and after completion of the cleaning cycle, the dishes located in the dishwasher is dried under supply of hot air. In the prior art, applications are predominantly known in which a water heater is used for heating the rinsing liquor. For heating the drying air for the items to be washed, a separate heating is usually used. For the drying of the items to be washed, different drying systems are provided in the prior art.

In a device known from DE 38 30 664 A1 for drying dishes in a domestic dishwasher, the rinse liquor is heated by a heater arranged outside the washing container. In this case, electrical water heaters are usually used. Using a substantially closed drying system, the air circulates from the rinse tank via a dryer and from there back into the rinse tank. Desiccant is stored in the dryer. The desiccant largely removes the moisture contained in the hot air supplied from the dishwasher. The comparatively dry air is forced back into the dishwasher via a blow-out opening. However, the drying device requires the cost-intensive use of desiccant, which has only a limited shelf life.

In another known drying device of DE 79 01 761 U1, the media streams for water and air are performed separately. A water flow pipe is surrounded by a two-walled radiator. To this arrangement, a protective tube is arranged in such a manner that the inner wall of the protective tube has a constant distance from the electric heater. The water flow tube is used to hold the rinsing fluid and is heated by the helical tubular heater. Through the space between the protective tube and the radiator, the air required for drying is blown. Due to the helical arrangement of the radiator, the air flow through the axis of the water flow pipe is swirled through, whereby a uniform heating of the air flow is to be achieved. This drying device requires a technically and costly consuming radiator, which is formed helically. The rinsing liquor and the drying air to be supplied are also led separately from each other in separate pipelines.

From DE 80 26 781.8 LM a dishwasher of the aforementioned type is known in which directly or indirectly the air supply or the supply of the rinsing liquor, seen in the flow direction of the water heater, is effected at its front end via two separate accesses , From a circulation pump rinsing liquid, seen in the flow direction of the water heater, introduced into this front and heated by a tubular heater arranged therein. By a second, seen at the flow heater in the direction of flow, front access is the supply of air in the water heater possible.

Another dishwasher is known from EP 1 224 902 A2. Herein, the heating device of the dishwasher is arranged at the lower end of a water tank of the washing container. The heater comprises at least one filter at the bottom of a water tank for receiving and filtering the wash water. The heater has via a catch basin, to receive the purified water and to hold the filter, as well as via a waste water drain. Within the heater, the filter is surrounded by a helical heating element and connected to the bottom of the sump. The heating element serves to heat the rinsing liquor, which is discharged from the filter. About a propeller, which is arranged in the direction of the items to be washed over the heating element, the items to be washed can be dried with hot air. However, such a construction requires a technically complex interaction of heating element, catch basin and filter. This construction presents itself as a relatively expensive solution with respect to the manufacture and maintenance of the device.

DE 102 39 494 A1 finally shows a device for heating liquids in a household appliance that carries water, in particular a dishwasher. The device has a structure which communicates with the liquid. The structure is provided on a surface with an electrical conductor, which is designed such that when current flows through the structure and with it the flowing liquid is heated.

The object of the present invention is therefore to provide a

To provide a dishwasher with the effective and economic aspects simplistic for heating the rinsing liquor and the supplied drying air only one heater is sufficient.

According to the invention the object is achieved by a dishwasher with a water heater, in which the switch is connected to an outlet side for wash liquor of the water heater.

The invention makes it possible to unify areas of the Spülflottenkreislaufes and areas of the drying air circuit. Instead of providing separate circuits for the heating air supply or for the Spielfleet supply in the dishwasher, the area of the cycle, which lies behind the respective material to be conveyed from the washing container through the pump sump to the instantaneous water heater, may be common to both products be used. Costly and repair prone units that are subject to regular maintenance, such as the pump sump, the water heater and the associated connecting lines, just need to be created easily. This simple system allows a further weight reduction of the dishwasher and a construction with smaller dimensions, which allows the installation preferably in small-volume dishwashers. The drying air flows through the water heater against the flow direction of the wash liquor.

Characterized in that the switch is arranged on the outlet side of the water heater, it is achieved that the respective heating of the air or the Spülflottenstroms a single heater is sufficient.

During the rinsing the rinsing liquor is passed from the pump sump through the water heater to the pump. During the drying process, however, air is sucked from the container interior and passed through the water heater. In this, the air is heated and then returned to the container interior.

According to a preferred feature of the invention, the water heater is a sump for receiving the water heater to be supplied to media, rinsing liquor or dry air upstream. This ensures that both flow media, wash liquor and dry air can be pre-cleaned by additional usable filter in the pump sump, thereby pollution and sustainable damage to the water heater and the subsequent other units is avoided. Additional separate suction devices for the wash liquor or the drying air are not required. The successive monitoring of the common flow aggregates sump (water heater, etc.) causes that in them no moisture or dirt particles can permanently accumulate. The closed drying system thus achieves a certain degree of self-cleaning. In a particularly advantageous manner, the water heater for the two media, wash liquor and dry air, a common inlet from the pump sump and a common drain to the switch. Such a construction eliminates the need for complex water heater with flaps or valves, which should ensure at several separate inlets in the water heater, that only one is open.

A further advantageous embodiment provides that the

Flow path of the two media, wash liquor and dry air, is separated between the switch and the container interior. This ensures that the cycle path, which is alternatively traveled by both media, is maximum. It is ensured that the length of the cycle route that is traveled only by a medium is minimal. This ensures that to save a second heating of the water heater of both media (rinsing and dry air) is traveled. The present invention therefore allows an additional reduction in manufacturing costs, since expensive aggregates can be used together for both media, thus only need to be created once. Using only a single flow heater reduces the number of fuses and thermostats required for each unit. Design variants with and without fan heaters are easy to implement.

After an additional feature of the invention, a circulation pump is used for the promotion of the rinsing water. Instead of this, however, any other suitable pump can be used.

In a particularly advantageous embodiment of the invention, the switch consists of a T-shaped tube. The cross section of the tube is arbitrary. Instead of this, however, any other suitable reusable diverter can be used. It is conceivable that the switch has a suitable valve (ball valve, changeover valve, shut-off valve or the like), which closes one arm of the switch in each case. For example, the respective shut-off of a channel can take place by means of a ball arranged in the valve, which separates the two channels from each other. The switch allows either the circulation pump or the blower is used, whereby it is ensured that the respective other medium does not damage the circulation pump or the blower. The use of the switch also allows easier replacement of the respective unit in the event of damage, which has a favorable effect in case of repair on material and time costs.

According to a further preferred embodiment of the invention, it is possible that the valve is coupled to a controller for the pump and / or the blower. The mentioned different coupling variants allow an exact control of the switch depending on the circulating pump or the blower or both units. The impairment of the circulation pump or the blower by the other medium, air or liquor is avoided by the exact control. This control also has a positive effect on the consumption of the dishwasher on consumables and cleaning agents.

Further features, details and advantages of the invention will become apparent from the following description of a preferred embodiment, and with reference to the schematic drawing. Hereby show:

Fig. 1 in a schematic representation of the invention

Embodiment of a dishwasher,

FIG. 2 is a perspective view of a switch as used in the dishwasher according to the invention according to FIG. 1 and FIG

Fig. 3 in a schematic representation of the invention

Embodiment of a dishwasher in a further embodiment

In Fig. 1, a container interior 1 is enclosed by side walls 2 and is provided with a rinse tank 3.

Under the washing tub 3 is not shown in detail

Pump sump 4 arranged, of a sieve, z. B. a fine screen 5, is covered. The pump sump 4 is connected via a connecting line 6 with a water heater 7, which is flowed through in the longitudinal direction. In the flow direction 8 connects to the outlet 9 of the Durchlauferhitzers 7 a T-shaped manifold 10, whose one arm

11 represents the connection to the instantaneous water heater 7 and in the direction of the arrow

12 is flowed through (Fig. 2). An arm 13 of this switch 10 leads to a circulating pump 14, whose outlet opening is shown at 15. Another arm 16 of the switch 10 is connected via a line 17 to a blower 18, the outlet line 19 of which is e.g. opens into a side wall 2 of the interior 1, which is not shown in detail. In the same way, the outlet opening 15 is connected to the devices arranged therein for washing dishes.

In the switch 10, a valve (not shown) may be arranged in the region of the branch 20 between the two arms 13 and 16, which alternatively closes the flow path 12 through the switch 10 either to the arm 13 or the arm 16, during the each other arm is open for flow.

The dishwasher has in a known manner to the flow of the entire work process regulating electrical / electronic control, which, as known per se, is not reproduced in the drawing. During operation of the circulating pump 14, ie during the flushing process, this control can close the arm 16 of the switch 10 leading to the fan 18. During the drying process, the control influencing the blower 18 causes the arm 13 of the switch 10 leading to the circulation pump 14 to close.

During operation of the dishwasher, the rinsing liquor is conveyed through the circulating pump 14 into the spraying devices (not shown) in the container interior 1 during the rinsing process. The rinsing liquor collects below the fine sieve 5 in the pump sump 4 and from there passes through the connecting line 6 into the instantaneous water heater 7, where it may be reheated, to the circulating pump 14. This circulation continues throughout the rinsing process. An analogous cycle identifies the drying process following the rinsing process. The fan 18 sucks the drying air through the switch 10 and the water heater 7 from the Pump sump 4 and pushes it back at 21 into the container interior 1. In Fig. 3 is another embodiment of an inventive

Dishwasher shown. The pump 14 is arranged upstream of the instantaneous water heater 7 in the flow direction 8 of the washing liquor and a float valve 22 is arranged in the line to the fan 18 of the switch 10. When operating the circulation pump 14, the float valve 22 closes due to the existing pressure of the wash liquor, because the float valve 22 is arranged on the pressure side of the pump 14. Notwithstanding this, the pump 14 could also be arranged between the switch 10 and the flow heater 7 (not shown). In this embodiment, too, the essential part of the drying air conveyed by the fan 18 flows through the pump sump into the washing compartment, because the flow resistance via the spray arms for the drying air is substantially greater due to the small spray openings in the spray arms.

Bezugszeichenhste

[0029] 1 container interior

2 side wall

3 rinse tank

4 pump sump

5 sieve

6 connecting line

7 water heater

[0036] 8 flow direction

[0037] FIG. 9 expiration

10 turnout

11 arm

[0040] 12 flow direction

13 arm

[0042] 14 circulating pump

[0043] 15 outlet opening

16 arm

17 line

18 blowers

19 outlet line

20 branch

[0049] 21 entry into the container interior

22 float valve

Claims

claims

1. Dishwasher, in particular domestic dishwasher, comprising a washing container for receiving items to be washed, a pump (14) for circulating the rinsing liquor, a blower (18) for circulating drying air for the items to be washed, a water heater (7), the alternative of the through the pump (14) conveyed rinsing water or by the blower (18) conveyed air for drying dishes with the same flow path is flowed through, a switch (10) and an arm (16) of the switch (20) with the blower (18 ), characterized in that the switch (10) connected to an outlet side (9) for rinsing water of the water heater (7).

2. Dishwasher according to claim 1, characterized in that the other arm (13) of the switch (10) with the pump (14) is connected.

3. Dishwasher according to claim 1 or 2, characterized in that in the switch (10) in the region of the branch (20) between the arms (13, 16) a valve, for. B. ball valve, is arranged, which alternatively one arm (13) or the other arm (16) closes and the respective other arm (13, 16) is opened.

4. Dishwasher according to claim 1, characterized in that with a valve, for. As float valve, the blower (18) or in the line (17) to the fan, the connection of the fan (18) can be opened and closed to the line for the rinsing water.

5. Dishwasher according to claim 4, characterized in that the pump (14) in the flow direction (8) of the wash liquor before the switch (10), in particular before the water heater (7) is arranged.

6. Dishwasher according to one of the preceding claims, characterized in that the flow heater (7) is preceded by a pump sump (4) for receiving the continuous flow heater (7) to be supplied medium, wash liquor or dry air.

7. Dishwasher according to one of the preceding claims, characterized in that the dry air is introduced substantially through the pump sump (4) in the washing container.

8. Dishwasher according to one of the preceding claims, characterized in that the water heater (7) for the two media, wash liquor and dry air, a common inlet (6) from the pump sump (4) and a common outlet (9) to the switch (10) having.

9. Dishwasher according to one of the preceding claims, characterized in that the flow path of the two media, rinsing liquor and dry air between the switch (10) and the container interior (1) of the washing compartment is separated.

10. Dishwasher according to one of the preceding claims, characterized in that the switch (10) consists of a T-shaped tube.

11. Dishwasher according to claim 3 or 4, characterized in that the valve is coupled to a controller for the circulating pump (14).

12. Dishwasher according to claim 3, 4 or 10, characterized in that the valve is coupled to a controller for the fan (18).