DE102005011732A1 - Household appliance used as dishwasher, washing machine or drinks machine, comprises pump for conveying liquids and pump drive formed as single phase synchronous motor - Google Patents

Abstract

Household appliance (1) comprises a pump (2) for conveying liquids and a pump drive formed as a single phase synchronous motor (11). Preferred Features: Two liquid delivery elements (3, 4) are arranged in the appliance to be supplied by the pump. A connection is arranged between the liquid delivery elements and the pump so that the delivery elements can be supplied with liquid independent of the pump. A starting device is included for the synchronous motor with a defined rotating direction.

Description

The The present invention relates to a household appliance according to the preamble of claim 1.

Household machines, especially dishwashers, Washing machines, vending machines or like that will be in big numbers manufactured. On the one hand, their production is subject to high cost pressure and on the other hand the demand for constantly improved functionality. Especially here comes components for promotion of liquids a key role to.

ever more comfortable the home appliance should be, the more components, especially fluid-conveying, are required. Thus, e.g. to achieve a better cleaning effect an increase the pressure or volume of a cleaning medium on a liquid dispenser required be. For example, only one of two in one dishwasher arranged spray arms be supplied with fluid at a certain time.

To But either two different pumps are required or one Combination of a pump with a fixed direction and one of these downstream conveyor jet distributor for the corresponding steering of the conveyed liquid jet.

A another possibility exists in this regard in the use of a high quality pump with two separately controllable Outlets. But this expensive engines are required by the guaranteed is that the respectively to be supplied fluid delivery by the correct direction of rotation of the motor is supplied. For example can to brushless DC motors are used, however, the manufacturing cost increase the household machine.

Task and advantages of Invention:

task The present invention therefore, a household appliance, especially a dishwasher, a washing machine, a vending machine or the like, according to the aforementioned type in cost-reducing Way to educate.

These The object is solved by the features of claim 1.

In the dependent claims are advantageous and expedient developments of the invention.

The Invention is based on a household appliance according to the preamble of claim 1. The essence of the invention is that the Pump drive is a single-phase synchronous motor. Because such engines can be produced very inexpensively, so can the production costs be significantly reduced.

This especially applies to embodiments with at least two liquid delivery elements, the above appropriately trained compounds independently selectable from the Pump can be supplied.

In a preferred embodiment can the selection of the relevant liquid dispensing element by the choice of the pump rotation direction. For this purpose, a commercially available pump housing with direction of rotation dependent controllable outlets Find application with a low-cost single-phase synchronous motor is driven. Other and / or other cost-driving elements for the correct distribution of the liquid to be pumped in the household machine are not required. Especially advantageous it is when with the pump a heater for the liquid to be pumped by her connected or even integrated in it. A particularly advantageous Integration can be achieved by the arrangement of most of the heat-conducting surface the heating directly in the conveyor channel the pump can be realized. To the outside are to increase the Heating efficiency insulating materials around the heating elements to arrange and inward to the best possible heat conduction accordingly good conductive materials.

at a dishwasher can the liquid delivery elements e.g. formed as separately supplied spray arms and / or spray nozzles be. This is e.g. possible, an upper and a lower basket with the full delivery jet to charge the pump while the other spray arm or the other spray nozzle in this one Time no liquid emits.

Either at a dishwasher as well as in a washing machine, the liquid dispensing elements, for example Be also alkali discharge elements, to which the pump, the liquid promotes. Solely by reversing the direction of pump rotation can the same pump e.g. the circulation or the pumping out of the liquor from the detergent container realized become. An additional conveying or distributor is not required.

In a drinks vending machine, the Liquid dispensing elements, for example, the liquid lines for the preparation of a specific, selected by the customer beverage. Or, similar to dishwashers and washing machines, a cleaning nozzle for cleaning the wet area as the first liquid discharge element and the second as a wastewater or alkali drain.

In a particularly preferred embodiment can be a starting device for the start of the single-phase synchronous motor with a defined direction of rotation be provided. This can be guaranteed be that cost-effective Engine, basically a start-up probability of about 50% in the right direction and about 50% in the wrong direction, in the operating case turns in the right direction. In particular, even a defined Direction of rotation selectable be.

Farther it is advantageous if the starting device is a direction of rotation detection device includes. This provides feedback whether the motor turns in the right direction or in the wrong direction For the Case that the motor turns in the wrong direction when starting Is it possible to stop the engine, so that not mistakenly an undesirable Liquid dispensing element is supplied.

Farther it is advantageous if the starting device, the start of the engine can repeat in the wrong start-up direction when previously started up. This can be guaranteed in any case be that the engine can be started until it is in the right direction is running, and for the pump to supply the proper fluid delivery element. Experience has shown this no later than after the third attempt the case.

By the observance of a break between the shutdown and the renewed Starting the engine can damage to the engine even under critical operating conditions the pump or other mechanical elements are avoided.

to Direction of rotation determination can in a particularly advantageous manner the direction of rotation detection device the evaluation of a parameter the motor supply voltage may be provided, for example the Zero crossing of the supply voltage. Of course they are but also other parameters of the supply voltage for evaluation suitable.

Of Furthermore, a sensor for detecting the direction of rotation may be provided be. Especially in the combined evaluation of the parameter the motor supply voltage and the sensor signal is a unique one Determining the direction of rotation of the motor shaft possible. By attraction the parameter of the motor supply voltage may otherwise be additionally required saved second sensor. As a sensor, for example, a Hall sensor can be used, which is inexpensive on the one hand and on the other hand delivers ready-to-process output signals.

Farther It is advantageous if one of these two or both signals as well as based on their evaluation, further signals to tap from the outside to disposal stand. With that you can other components of the household machine are supplied. For example can be tested whether a particular fluid delivery element just with liquid is supplied. Of course But other applications are possible, such as a Indication that a detergent chamber is being flushed through or that a liquor is pumped out.

Around ensure that the direction of rotation is detected correctly the direction of rotation detection device, the sensor signal and / or the parameter of the motor supply voltage via an offset of the Polradwinkels between 0 ° and Evaluate 90 °. Under Polradwinkel while the angle is understood as the offset between the caused by the supply voltage magnetic Alternating field and the magnetic field of the rotor occurs, and load-dependent between Move 0 ° and 90 ° can.

Preferably However, the loads occurring during operation must be interpreted as that never a 90 ° going Pole angle can occur. Otherwise there is a risk that the direction of rotation of the motor jumps in the opposite direction and this continues to go wrong or even a claim occurs.

Drawings:

Two embodiments The invention is illustrated in the following drawings and further details below, giving further details.

It demonstrate:

1 + 2 two household appliances in a schematic representation,

3 a schematic structure of an engine for a pump of a household appliance according to the invention,

4 Characteristics of the motor at high load and

5 Characteristics of the engine at idle.

1 and 2 each show a household machine 1 in a schematic representation. In this case, only the components are shown, also only schematically, which are essential for the functionality of the invention.

In the 1 represents the household machine 1 Accordingly, a dishwasher. A pump 2 promotes liquid to two liquid discharge elements 3 . 4 , The drive for the pump according to the invention is a single-phase synchronous motor 11 intended.

In order to achieve the best possible cleaning effect, the two liquid discharge elements exemplified here can be used 3 . 4 preferably be supplied independently of the pump with liquid.

Of course you can To achieve a better cleaning effect even more liquid delivery elements be combined with these two. However, one is preferred tier-wise combination, so as to be as good and concentrated Cleaning effect with the full pumping capacity for one chosen Crockery basket can be achieved.

The Selection of the relevant liquid dispensing element or an optionally existing liquid discharge element group can at a such structure quite simply, only by the choice of the pump rotation, respectively. Other liquid handling and / or Deflection means are not required to achieve this effect.

In the present example, this is called spray arm 3 formed liquid discharge element 3 the dishwasher 1 from the pump 2 supplied with liquid. This drives the single-phase synchronous motor 11 the pump 2 according to the direction of rotation of the arrow indicated by a solid line 10b at. In a similar way, that of the spray arm 3 discharged liquid is shown schematically by solid lines.

To distinguish the temporally separate control of the spray arm 4 is both the arrow 10a for the opposite direction of rotation of the pump 2 as well as the symbolically represented liquid delivery by the spray arm 4 shown in dashed lines.

In the 2 the household machine is symbolically represented as a washing machine. Again, only the essential elements of the invention, also schematically shown. The numbered 1 to 11 provided elements correspond to the elements in the 1 , wherein the two liquid discharge elements 3 . 4 In the washing machine realize further exemplary functions.

The liquid delivery element 3 is here designed as a liquor distributor or the like, which corresponds to the pump rotation direction according to arrow 10b supplied with the liquid to be pumped during the circulation program. With the same pump can be reversed the direction of rotation, according to the direction of the arrow 10a , the lye of the washing machine are pumped out. For this sucks the pump 2 this from the tub 8th and conveys them via the pump outlet 6 to the trained as a hose end liquid discharge element 4 , This is in a known manner as Laugenschlauchende in a sewage siphon. Again, no further Flüssigkeitsförder- and / or deflection are required to realize this functionality.

This structure thus also allows a combination of functions, which has previously been realized by several Flüssigkeitsförder- and / or deflection. It integrates the function of a circulation pump and the function of a Laubabsaugpumpe. This is again possible through the use of a single-phase synchronous motor 11 as a drive for the pump 2 with the pump outlets 5 . 6 , Due to their preferably tangential arrangement on the pump housing passes through them only from the pump 2 pumped liquid out when the single-phase synchronous motor 11 the pump 2 in the appropriate direction 10a respectively. 10b drives.

In 3 is a single-phase synchronous motor 11 with a rotor 13 and a Hall sensor 12 shown acting as a drive for pumping liquid in a household appliance 1 provided pump 2 serves. For energy and signal management is a starting device 14 provided and over the lines 15 . 16 with the engine 11 and the Hall sensor 12 connected.

The Hall sensor 12 has an electrical output which, depending on the rotor position "0" or "1" as digitized signals to the starting device 14 transmitted, which this can evaluate the direction of rotation detection for the motor, preferably in combination with a parameter of the motor voltage. Furthermore, it may contain units for stopping and restarting the engine after starting in the wrong direction of rotation, preferably while maintaining a sufficient break.

About the entrance 17 and the exit 18 are the supply and the output of energy and signals possible. Optionally, it can be used to make connections to other units of the household appliance.

In the 4 and 5 Several signals or curves are shown. Here, curve I relates to the mains voltage and curve II relates to the digitized mains voltage of the motor 11 , Curve III represents the signal of the Hall sensor 12 Schematic IV shows schematically the start signal for evaluation (edge triggering).

In the 4 and 5 For each flank of the fourth curve IV, the direction of rotation is evaluated. How to compare the two 4 (high load) and 5 (Idle) can be seen well, the evaluation time was set so that the entire possible Polradwinkel (ie the displacement of the third curve III or the corresponding signal between 0 ° and 60 °) is almost no signal change and thus an error-free evaluation is possible.

Preferably in the evaluation of the direction of rotation, the "double evaluation" is used, i. per revolution (360 °) will be twice the direction of rotation is evaluated (on both flanks of curve IV). Possible and usual are however basically one, two and four evaluations per revolution. The evaluation happens in these cases analog.

at all characters is running the engine in the same direction (right). You can tell by this that the Hall signal III at the positive evaluation edge (curve IV goes from "0" to "1") is "1" and at the negative evaluation edge (curve IV goes from "1" to "0") is "0". With counterclockwise rotation is the Hall signal (curve IV) inverted (or twice Polradwinkel shifted, but with clever choice of the evaluation position does not matter). In reverse, this results in the positive evaluation slope a "0" at the Hall signal IV, with the negative evaluation edge a "1" at the Hall signal IV.

1

Appliance

2

pump

3

Liquid dispensing element

4

Liquid dispensing element

5

pump outlet

6

pump outlet

7

pump inlet

8th

tub

9

management

10a

arrow

10b

arrow

11

Single-phase synchronous motor

12

Hall sensor

13

rotor

14

starter

15

management

16

management

17

entrance

18

output

I

Curve

II

Curve

III

Curve

IV

Curve

Claims (18)

Household machine, in particular dishwasher, washing machine, drinks machine or the like, with a pump for conveying liquids, characterized in that the pump drive is a single-phase synchronous motor. Domestic appliance according to claim 1, characterized that at least two to be supplied with the pump liquid discharge elements available. Household machine according to one of the two claims 1 or 2, characterized in that between the at least two to supplying liquid delivery elements and the pump is arranged a connection such that the at least two liquid delivery elements to be supplied independent from each other selectable from the pump with liquid can be supplied. Household machine according to one of the preceding claims, characterized characterized in that the supply of the liquid discharge element of the direction of pump rotation is. Household machine according to one of the preceding claims, characterized characterized in that the liquid dispensing elements spray arms a dishwasher are. Household machine according to one of the preceding claims, characterized characterized in that the liquid dispensing elements Functional elements of a washing machine are. Household machine according to one of the preceding claims, characterized characterized in that the liquid dispensing elements Elements of a drinks vending machine are. Household machine according to one of the preceding claims, characterized characterized in that a starting device for starting the single-phase synchronous motor exists with a defined direction of rotation. Household machine after one of the preceding Henden claims, characterized in that the starting device is designed such that a defined direction of rotation can be selected. Household machine according to one of the preceding claims, characterized characterized in that the starting device is a direction of rotation detecting device includes. Household machine according to one of the preceding claims, characterized characterized in that the starting device for stopping the engine is formed at startup with the wrong direction of rotation. Household machine according to one of the preceding claims, characterized characterized in that the starting device to repeat the starting at is formed prior false start. Household machine according to one of the preceding claims, characterized characterized in that the starting device for maintaining a pause between switching off and restarting the engine is provided. Household machine according to one of the preceding claims, characterized characterized in that the direction of rotation detection device has a parameter evaluates the motor supply voltage. Household machine according to one of the preceding claims, characterized in that a sensor is provided for detecting the direction of rotation is. Household machine according to one of the preceding claims, characterized in that the direction of rotation recognition device is combined Evaluation of the parameter of the motor supply voltage and the sensor signal is trained. Household machine according to one of the preceding claims, characterized characterized in that the direction of rotation detecting device is the sensor signal and / or the parameter of the motor supply voltage via a Offset of the rotor angle between 0 ° and 90 ° evaluates. Household machine according to one of the preceding claims, characterized in that a Hall sensor is provided as the sensor.