WO2013131847A1

WO2013131847A1 - Water-bearing domestic appliance having at least a motor-driven pump and a heating device

Info

Publication number: WO2013131847A1
Application number: PCT/EP2013/054256
Authority: WO
Inventors: Stephan Lutz; Bruno Reiter; Markus Wecker
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2012-03-08
Filing date: 2013-03-04
Publication date: 2013-09-12
Also published as: DE102012203715A1

Abstract

A water-bearing domestic appliance (1), in particular a dishwasher, which has wet areas that bear liquid (FW; S) during operation, in particular a processing chamber (2) for cleaning items to be cleaned or washed, wherein at least a circulating part (S) of the liquid (FW; S) can be heated and for this purpose a control device (16) for a motor (13) of a circulating pump (6) is associated with the circulating pump (6), which is provided with a heater (11), wherein the motor (13) is monitored by a security device (15), is designed in such a way that the safety device (15) of the motor (13) and the control electronics (16) of the motor (13) and the control and safety device of the heater (11) are combined with the heating pump (6) to form an approved unit.

Description

Water-conducting household appliance with at least one motor-driven pump and a heating device

The invention relates to a water-conducting household appliance, in particular a dishwasher, which has liquid leading wet areas during operation, in particular a processing space for cleaning rinsing or laundry, wherein at least one circulating part of the liquid is heatable and for this purpose at least one

liquid perfused body, in particular a circulating pump, a

Heater is associated with and wherein a motor of the circulating pump is monitored by a shutdown in case of need safety device according to the preamble of claim 1 and a household appliance according to the preamble of claim 13th

In such water-conducting household appliances, among other external heaters are used, for example, as a thick-film or thin-film heaters generate meandering and current-carrying conductor tracks heat in a wall of a body on which they rest outside, for example on the body of a circulating pump over the Body wall in the interior of the body and the fluid moving there heat introduce heat. Also a heating inside this body is possible. Such a circulating pump, which also includes a heater, is often referred to as a heating pump.

It is also desirable to monitor a motor driving such a pump via a safety device which detects pumping of foam and / or air, for example in the event of an intake to speed mismatch, and a response thereto, such as an indication Alarm or one

Function stop, causes.

The invention is based on the problem to achieve a high level of security with the lowest possible component-side and assembly-side effort.

The invention solves this problem by a water-conducting household appliance, in particular a dishwasher, with the features of claim 1 and 13th Further advantages and features and developments of the invention are in the

Claims 2 to 12 and 14 to 15 indicated, whose features can be implemented individually or in combination with each other.

With the invention is a water-conducting household appliance, such as a

Dishwasher, created the uses of a

Extended safety device of the engine and thereby reduces component and assembly costs. The fact that this safety device of the motor of the circulating pump in a double function also forms a shutdown of the heating effecting safety device if necessary, can be on an additional own

Safety device of the heater are completely dispensed with.

In particular, a control electronics of the motor, a control electronics of the heater and the safety device are united in a common housing for a high integration density. This housing can form an integral part of a housing of a heating pump, so that in this respect the structural complexity is minimized.

If the control electronics of the motor, the control electronics of the heater and the safety device are wirelessly connected to each other, the EMC is improved. There is also no danger of interference from torn or corroded cable connections.

Particularly advantageous are the drive electronics of the motor, the control electronics of the heater and the safety device arranged on a common board. Thus, both the function control of motor and pump on the one hand and the heater on the other hand and also for the so-called. Second Abschaltweg, so the functional safety, said units, only a common board required, which is also an intrinsically safe and tested before installation unit can represent. When the control electronics of the engine, the control electronics of the heater and the safety device are arranged directly on a wall, in particular within the housing, or on, in particular outside on the housing of a motor-driven heating pump and connected wirelessly, not only account for the Connecting cables of the electronic assemblies with each other, but also to the hardware of the pump and heating. Thus, the EMC are improved and potential sources of error avoided.

For such a direct structural connection are low, the control electronics of the engine, the control electronics of the heater and the safety device for both units on a frontal or peripheral wall, especially within the housing, or on, in particular outside on the housing of the motor-driven heating pump arranged directly. For the heating monitoring, the safety device of the motor can receive another input signal from a temperature sensor, which is thereby incorporated as a value to be monitored in the functional safety of the engine.

When the heater protection is fully achieved through the engine safety device and its functional-safety functions, any additional heater monitoring units are completely dispensable, optimizing the degree of integration and component efficiency.

In addition, it is possible, in particular, for the safety device of the motor to fulfill all functional-safety functions of the domestic appliance, that is to say also to monitor additional technical units via this safety device.

For a high security, the security device of the heating suitably comprises two individually switchable relay ^'for phases the one hand and the neutral conductor on the other.

In particular, it is possible by the development of two software-implemented PEC (Protective electronic circuits) for the engine and the heater to perform this VDE-tested as functional safety for engine and heating. The component cost is particularly low due to the software implementation.

In the embodiment according to claim 13 is characterized in that the safety device of the motor and the control electronics or control device of the motor and a Control and safety device of the heating are combined with the heating pump to a approbierten unit, this unit tested for themselves and in particular requires no approved bus control in water-conducting household appliance, ie in the respective machine.

This can be sufficient for this unit from the outside only an input signal to the currently desired speed and heating power and a return for an error message, whereby the cost of integrating this modular unit in the machine and for the connection to the central engine control is conceivable low. In particular, this also contributes to the fact that no approved bus is required for the external connection of the approved unit.

Other advantageous developments of the invention are given in the dependent claims.

The above-described and / or reproduced in the subclaims advantageous embodiments and developments of the invention can thereby - except, for example. in cases of clear dependencies or incompatible alternatives - - individually or in any combination with each other.

The invention and its advantageous embodiments and further developments and advantages thereof are explained in more detail below with reference to drawings.

They show, in each case in a schematic outline sketch:

Fig. 1 shows an exemplary water-conducting household appliance, here as

Dishwasher formed, in a schematic and partially broken side view, wherein a washing container is provided, which has in its lower part a so-called. Pumping pot from which in the washing container is conveyable lei,

Fig. 2 is a drawn out and exemplary detail of a

heated circulating pump in a schematic side view, and Fig. 3 is an exploded perspective view of the heatable circulating pump with a heating device arranged outside it.

Elements with the same function and mode of operation are provided with the same reference numerals in the figures. In the figures, only those components of a dishwasher as an advantageous embodiment of a household appliance according to the invention are provided with reference numerals and explained, which are necessary for the understanding of the invention. It goes without saying that the dishwasher can comprise further parts and assemblies.

The dishwashing machine 1 shown schematically in FIG. 1 is a water-conducting domestic appliance and is embodied here by way of example as a domestic dishwasher. It has at least one washing container 2 for receiving ware to be processed such as dishes, pots, cutlery, glasses, cooking utensils u. on.

The washing container 2 is in particular on its front side of a door 3 tightly closed. This door 3 is shown in Figure 1 in the closed position and

for example, swung around a lower horizontal axis forward and downward. Another, different from the pivoting opening movement is possible.

The rinse tank 2 is via a fresh water inlet with fresh water FW

acted upon. The fresh water FW is in particular in its circulation with

Provided cleaning, drying and / or brightening agents and / or other additives and can flow in the area of the bottom 4 in a sump 5. From there it passes through a circulation pump 6 again as a rinse S into circulation and can, for example, via sprayers 7, 8, here rotatable spray arms, again be used to hold the Spülkörben 9, 10 halterable items or flows over at the end a further pump as wastewater AW from the device 1. At least one circulating part S of the liquid FW; S can be heated in certain phases of the cleaning. In the embodiment shown here, a heating device 11 is provided for this purpose at least on a body 12 through which liquid flows. This heatable and liquid perfused body 12 is formed here by the circulation pump 6, which thus assumes the function of a heating pump. A heating arrangement on another body 12 through which fluid flows, for example also a pipe section, is additionally or alternatively possible. In such a case, the

liquid perfused body 12 with its associated heating device is preferably arranged separately from the circulating pump 6.

The pump 6 comprises, for example, an axial inlet 6a, a tangential outlet 6b and an impeller 6c as a conveying element arranged on the axis 13a of a motor 13.

The heater 1 1 may be formed differently and form, for example, an external thin-film heating or a thick-film heating or pipe heating.

In this case, a motor 13 is provided as a drive of the circulating pump 6, for example a synchronous motor. Here, the motor 13, the circulation pump 6 and the heater 1 1 are held in total in a common housing 14, so that an integral unit is formed.

About the securing device 15 of the motor 13 of the circulation pump 6, the amount of current of the individual phases and the phase position are monitored here. Also, other or alternative parameters can be detected. In any case, in the

If necessary, so when detecting an error, a shutdown of the engine 12 of

Circulating pump 6 and / or at least one alarm message by the safety device 15 are effected in order to avoid a dry running of the circulating pump 6.

This safety device 15 of the motor 13 forms in a dual function also in case of need, a shutdown of the heater 1 1 causing safety device for this. This is a separate safety device for the heating 1 1 dispensable. As can be clearly seen, for example, in FIGS. 2 and 3, there are one

Control electronics or control device 16 of the motor 13, the safety device 15 of the motor 13 and a control electronics or control device 16 ^'of the heater 1 1 in a common housing, namely the housing 14 of the heating pump united. The control electronics 16 of the motor 13, the control electronics 16 ^'of the heater 1 1 and the safety device 15 of the motor 13 are wirelessly connected to each other in order to increase the integration and minimize sources of interference and installation costs. A data bus between the components mentioned is then unnecessary. In particular, as shown here, the control electronics 16 of the motor 13, the control electronics 16 ^'of the heater 1 1 and the safety device 15 are arranged on a common board 17.

The safety device 15 asks to monitor the heater 1 1, for example, two designed as NTC temperature sensor in redundant measurement, which are in contact with the heater 1 1 and determine their current temperature. With these input data, the phases of the neutral conductor via two ^relays on one hand and on the other hand are connected.

It can not only account for the cables between the components mentioned, but the control electronics 16 of the motor 13, the control electronics 16 ^'of the heater 1 1 and the safety device 15 can be arranged directly on a wall 18 of a motor-driven heating pump 6 and thus with this, So the motor 13 and the heater 1 1, wirelessly such as via one or more tracks on the board 17 and / or be connected via direct electrical connections. Overall, therefore, both the connection electronic engine and the

Connection electronic temperature sensor as well as the connection electronics heating are carried out wirelessly, so that a better EMC behavior and a simplified assembly result. Here in the embodiment, the arrangement of the safety device 15, the

Control electronics 16 of the motor, as well as the control electronics 16 ^'of the heater 1 1 realized on a frontal wall 18 in the housing 14. Likewise, alternative would also be an arrangement on a peripheral wall, so a longitudinally extended

Wall, designed as a heating pump circulating pump 6 possible.

It is not necessary that additional components are provided in addition to the mentioned safety device 15 of the motor 13 for the heating protection. Rather, the heating protection is completely achieved via the safety device 15 of the motor 13 and its functional safety functions.

In this case, the functional safety comprises two safety devices PEC (Protective Electronic Circuits) for the motor 13 and the heater 11 which have been removed by an external test point, so that software determines the sequences to be effected for each type of fault.

The control device or drive electronics 16 of the engine and the

Safety device 15 of the motor 13 and the control and

Safety device 15 of the heater 1 1 are summarized by the common functional safety with the heat pump 6 to a approved and already tested before installation for proper operation unit. It is compact and self-contained as well as intrinsically safe. Installation in various devices is also possible if these devices have different central controls with different functional ranges. The unit of the heating pump 6 is therefore independent of the respective

Electronics. Due to the completely usable intrinsically safe unit, the complexity of the device electronics can also be significantly reduced.

This unit or this module is therefore preferably only changed completely in customer service; through the integration is in a possible change, in particular incompatible, connection of a new pump to an old electronics excluded.

This approbierte unit needs only from the outside an input signal to the currently desired speed and heating power and a return line for an error message can therefore be connected without a approbierte Datenbusleitung with a central controller of the household appliance 1. Simple interfaces are sufficient. It is even possible that the safety device of the motor 13 fulfills all functional-safety functions of the household appliance 1, that is not only responsible for the motor 13 and the heater 1 1.

LIST OF REFERENCE NUMBERS

Dishwasher, 13a motor axle,

Washing container, 14 housings,

Door, 15 safety device desa swivel axle, motor,

Bottom of the washing container, 16 control electronics of

Swamp, Motors,

Circulation pump, 17 circuit board,

a inlet, 18 wall,

b outlet,

c impeller,

Spray arm, FW fresh water,

Spray arm, AW wastewater,

Wash basket, S rinse liquor

0 wash basket,

1 heating device,

2 fluid-flowed body,

3 engine,

Claims

Water-conducting household appliance (1), in particular a dishwasher, which has liquid areas (FW; S) in operation, in particular a processing space (2) for cleaning rinsing or laundry, at least one circulating part (S) of the liquid (FW; ) is heated and for this purpose at least one liquid flowing body (12), in particular a circulating pump (6), a heating device (1 1) is associated with and wherein a motor (13) of the

Circulation pump (6) of a shutdown in case of need

Safety device (15) is monitored,

characterized,

that the safety device (15) of the motor (13) in a dual function also in case of need, a shutdown of the heater (1 1) causing

Safety device for these forms.

Water-conducting household appliance (1) according to claim 1,

characterized,

in that a control electronics (16) of the motor (13), a control electronics (16 ^' ) of the heater (11) and the safety device (15) of the motor (13) are combined in a common housing (14).

Household appliance (1) according to claim 2,

characterized,

that the control electronics (16) of the motor (13), the control electronics (16 ^' ) of the heater (1 1) and the safety device (15) of the motor (13) are wirelessly interconnected.

Household appliance (1) according to claim 3,

characterized,

the control electronics (16) of the motor (13), the control electronics (16 ^' ) of the heater (11) and the safety device (15) of the motor (13) are arranged on a common board (17).

5. Household appliance (1) according to claim 4, characterized,

that the control electronics (16) of the motor (13), the control electronics (16 ^' ) of the heater (1 1) and the safety device (15) of the motor (13) directly to a wall (18) of a motor-driven heating pump (6) and arranged connected to this wirelessly.

6. Household appliance (1) according to claim 5,

characterized,

the control electronics (16) of the motor (13), the control electronics (16 ^' ) of the heater (1 1) and the safety device (15) of the motor (13) are arranged on a frontal or peripheral wall of the motor-driven heating pump (6).

7. Household appliance (1) according to one of the preceding claims,

characterized,

the safety device (15) of the motor (13) receives a further input signal from at least one temperature sensor.

8. Household appliance (1) according to one of the preceding claims,

characterized,

that the heating protection is achieved completely via the safety device (15) of the motor (13) and its functional safety functions.

9. Household appliance (1) according to one of the preceding claims,

characterized,

the safety device (15) of the motor (13) fulfills all functional-safety functions of the domestic appliance (1).

10. Household appliance (1) according to one of the preceding claims,

characterized,

the safety device (15) of the heater (11 ⁾ comprises two individually switchable relays.

1 1. Domestic appliance (1) according to one of the preceding claims, characterized,

in that the safety device (15) comprises 2 PECs (Protective electronic circuits) for the motor (13) and the heater (1 1).

12. Household appliance (1) according to one of the preceding claims,

characterized,

that the safety device (15) of the heater (1 1) has a redundant

Temperature measurement via at least two sensors includes.

13. Water-conducting domestic appliance (1), in particular a dishwasher, which has liquid (FW; S) wet areas in operation, in particular a processing space (2) for cleaning rinsing or laundry, wherein at least one circumferential part (S) of the liquid (FW S) is heated and for this purpose a heating device (1 1) provided with a circulation pump (6) for a motor (13) of the circulating pump (6) is assigned, wherein the motor (16) by a safety device (15 ) is monitored, in particular according to

at least one of the preceding claims,

characterized,

that the safety device (15) of the motor (13) and the control electronics (16) of the motor (13) and a control and safety device of the heater (1 1) with the heating pump (6) to a approbierten unit

are summarized.

14. A water-conducting household appliance (1) according to claim 13,

characterized,

that the approved unit only from the outside an input signal to the currently desired speed and heating power and a return line for a

Error message needed.

15. Water-conducting household appliance (1) according to one of claims 13 or 14,

characterized,

that no approved bus is required for the external connection of the approved unit.