ES2402550T3 - Dishwasher and control procedure - Google Patents

Abstract

A dishwasher (1) comprising: a sump (3) A dishwasher (1) comprising: a sump (3) in which water accumulates during the process d in which water accumulates during the washing process; a circulation pump (4) that returns and washes; a circulation pump (4) that returns the water from the sump (3), and that is operated by uel water from the sump (3), and that is driven by an electric motor variable speed; one arm n electric motor with variable speed; a high flow spray arm (12) in which (12) high flow spray in which water is sprayed to the items to be washed at water is sprayed to the items to be washed at a high rate; operating the pump (4) of high flow rate; operating the circulation pump (4) primarily at a high revolution rate primarily at a high rev rate and; a low flow spray arm (112) and; a low flow spray arm (112) in which the water is sprayed at a low flow rate, in which water is sprayed at a low flow rate, operating pump (4) of circulation mainly operating pumping pump (4) of circulation mainly at a low rate of revolutions; and while e at a low rate of revolutions; and while the spray arms (12, 112) are operated the spray arms (12, 112) are operated consecutively, the number of revolutions of the one consecutively, the number of revolutions of the circulation pump (4) remains constant to the pump ( 4) the circulation remains constant at any of said high speed or any of the high speed or low speed, during a period (P) at a low speed, during a period (P) of transition from the arm (12) transition spray from the high flow spray arm (12) to the high flow spray arm (112) to the low flow spray arm (112) and from the low flow spray arm (112) and from the low flow spray arm (112) to the low flow spray arm (12) to the high flow spray arm (12), characterized in that the high flow number or, characterized in that the number of revolutions of the circulation pump (4) is of revolutions of the circulation pump (4) is modified in a range (ΔT1, ΔT2) modified in a predetermined interval (ΔT1, ΔT2) before and / or after a predetermined period of time before and / or after a period (P) of transition from an arm (12, 112), a transition period (P) from one arm (12, 112) of spraying to another. depulverization to another.

Description

Dishwasher and control procedure

The present invention relates to a dishwasher with improved washing performance and a control method thereof.

5 In the dishwasher, the washing process is carried out by spraying water, simultaneously or consecutively, from the lower and upper sprayers to the items to be washed which are placed in the lower and upper baskets. Since, in general, very dirty dishes are placed in the lower basket and slightly dirty dishes in the upper basket, the lower spray is fed with high pressure water, while the upper spray is fed with low pressure water. Usually, the lower and upper sprayers are operated

10 consecutively, and by alternately feeding the sprayers, water and energy are saved, which is used to heat the water.

In European patent application EP 1029496, in a dishwasher, the speed of the circulation pump is reduced during a transition from one sprayer or group of sprayers to another.

In European patent application EP 0943282, in a dishwasher, an interval program can be selected;

In a first interval only the upper spray lever and in a second interval only the lower spray lever are feeding the rinsing liquid and the pump motor speed can be adjusted as a function of the corresponding interval.

In European patent application EP 1029498, in a dishwasher, the speed of the circulation pump is regulated, according to the amount of variant feed, during a transition from a

20 sprayer or group of sprayers to another.

In European patent application EP 1029499, in a dishwasher, during the operation of the sprayer or lower spray group (s), the number of revolutions of the circulation pump is set to a higher value than for the upper sprayers. Another known dishwasher is described in US-A-5 924 432.

The objective of the present invention is the realization of a dishwasher and a control method thereof, in which water is saved and the washing performance is improved.

The dishwasher and the control procedure thereof, performed to achieve the object of the invention mentioned above have been illustrated in the accompanying drawings, in which;

Figure 1 - is a schematic representation of a dishwasher.

Figure 2 - is a graph illustrating the change in the number of revolutions of the circulation pump according

30 with the active periods of the spray arms, in a dishwasher according to the current state of the art.

Figure 3 - is a graph illustrating the change in the number of revolutions of the circulation pump according to the active periods of the spray arms, in a dishwasher according to the application of the present invention.

Figures 4, 5-are graphs illustrating the change in the number of revolutions of the circulation pump according to the active periods of the spray arms, in a dishwasher according to the alternative applications of the present invention.

Figure 6 - is a similar graph, in a dishwasher that is not part of the invention, but which represents the prior art that is useful for understanding the invention.

40 The items shown in the drawings have been listed as follows:

one.

 Dishwasher

2.

Wash tank

3.

 Sink

Four.

 Circulation pump

45 5. Valve

6.

Discharge pump

7.

 Heater

8. Filter

11, 111. Basket

12, 112. Spray arm

The dishwasher (1) comprises a washing tank (2), in which the items to be washed are placed in a sump (3) in the lower part of the washing tank (2), in which the water in the tank (2) washing is accumulated during the washing process, a heater (7) used to heat the washing water, which preferably operates during the circulation of the washing water, a circulation pump (4) that feeds the water into the sump (3) back to the wash tank (2) and, is operated by an electric motor with variable speed, a multi-way valve (5) at the outlet of the circulation pump (4) that establishes that the water that It will be sent to both or any of the lower and upper feed lines, a discharge pump (6) through which water, accumulated in the sump

(3)

 At the end of the washing process, a dishwasher (1) is discharged from the dishwasher (1) that prevents dirt particles from reducing the washing efficiency by introducing more than one basket (11, 111) into the circulation. that the items that are washed are placed, a high flow spray arm (12) used for very dirty dishes, in which water is sprayed at a high flow operating the circulation pump (4) mainly at a high rate of revolutions and, a low flow spray arm (112) used for slightly dirty dishes, in which water is sprayed at a low flow operating the circulation pump (4) primarily at a low revolution rate.

In the dishwasher (1), while the spray arms (12, 112) are operated consecutively, the number of revolutions of the circulation pump (4) remains constant during a transition of the high flow spray arm (12) to the low flow spray arm (112) and the low flow spray arm (112) to the high flow spray arm (12), while the number of pump revolutions

(4)

 Circulation is changed before or after a transition from one spray arm (12, 112) to another, at a different time than the transition period.

To explain the control procedure of the dishwasher (1), object of the present invention, the revolutions numbers of the circulation pump (4), the cycle times and the quantities of water used in these times, during the consecutive operation of the spray arms (12, 112) are indicated as follows;

N1: is the number of revolutions of the circulation pump (4), so that the spray arms (12, 112) spray water at a high flow rate.

N2: is the number of revolutions of the circulation pump (4), so that the spray arms (12, 112) spray water at a low flow rate.

T1: is the predetermined cycle time of the spray arm (12) that mainly sprays water at a high flow rate, during consecutive operation.

T2: is the predetermined cycle time of the spray arm (112) that mainly sprays water at a low flow rate, during consecutive operation.

P: is the transition period when the cycle time of one of the spray arms (12, 112) ends and the cycle time of the other begins.

ΔT1: is the predetermined time interval in a cycle time (T1) of the high flow spray arm (12) when said spray arm is fed with water at a low flow, during the consecutive operation.

ΔT2: is the predetermined time interval in a cycle time (T2) of the low flow spray arm (112) when said spray arm is fed with water at a high flow rate, during the consecutive operation.

According to the dishwasher (1), the control procedure with respect to the present invention, while the spray arms (12, 112) are operated consecutively, the circulation pump (4) is operated at a high rate (N1 ) of revolutions of revolution during a period T1-ΔT1 while operating at a low rate (N2) of revolutions during a period ΔT1, taking into account the high-flow spray arm (12). In the transition period (P), while the circulation pump (4) continues to operate at a low rate (N2) of revolutions, the cycle time (T1) of the high flow spray arm (12) ends and the cycle time (T2) of the low flow spray arm (112) begins. The circulation pump (4) is operated at a low rate (N2) of revolutions during a period T2-ΔT2, while it is operated at a high rate (N1) of revolutions during a period ΔT2. In the transition period (P), while the circulation pump (4) continues to operate at a high rate (N1) of revolutions, the cycle time (T2) of the low flow spray arm (112) ends and the Cycle time (T1) of the high flow spray arm (12) begins (Figure 3).

Vibration and noise are avoided as a result of the fact that the transition between the spray arms (12, 112) and the change in the number of revolutions of the circulation pump (4) are carried out at different times; it is also achieved that the water in the sump (3) does not fall below a certain level, reducing the number of revolutions of the circulation pump (4) during a period of # T1 within the time (T1) of the arm cycle (12) high flow spray and that the filter (8) be washed as a result of the increase in the level of water during said period (T1) and that the efficiency of the water jet increase as dirt removal increases the number of revolutions of the circulation pump (4) during a period of # T2 within the cycle time (T2) of the high flow spray arm (112) and, since said period (T2) is kept short, it prevents The fragile load is damaged.

In another application of the present invention, while the number of revolutions of the circulation pump (4) is modified in the cycle time (T1) of the high flow spray arm (12), it remains constant for the time ( T2) cycle of the low flow spray arm (112). In this application, the high flow spray arm (12) is operated while the circulation pump (4) is at a high rate (N1) of revolutions, while the revolution rate is decreased (N2) at the end of the cycle time (T1) during a period ΔT1 and, at the transition point (P), while the circulation pump (4) continues to operate at a low rate (N2) of revolutions, the cycle time (T2) of the Low flow spray arm (112) begins and ends with the same rate (N2) of revolutions (Figure 4).

In another application of the present invention, while the number of revolutions of the circulation pump (4) is modified in the cycle time (T2) of the low flow spray arm (112), it is kept constant for the time ( T1) of the high flow spray arm (12) cycle. In this application, the low flow spray arm (112) is operated while the circulation pump (4) is at a low rate (N2) of revolutions, while the rate of revolutions increases (N1) at the end of time (T2) cycle during a period ΔT2 and, at the transition point (P), while the circulation pump (4) continues to operate at a high rate (N1) of revolutions, the cycle time (T1) of the arm (12) high flow spray starts and ends with the same rate (N1) of revolutions (Figure 5).

In an embodiment that is not part of the present invention, it is achieved that during the period ΔT1, the spray arms (12, 112) are operated simultaneously at the same rate (N2) of revolutions by also feeding the spray arm (112) low flow through a multi-way valve (5) during period # T1 when the flow of water sprayed by the high flow spray arm (12) is reduced, and similarly, that during the period ΔT2, the spray arms (12, 112) are operated simultaneously at the same rate (N1) of revolutions by also feeding the high flow spray arm (12) through a multi-way valve (5) during the period ΔT2 when the water flow sprayed by the high flow spray arm (12) is increased, and thereby avoiding the noise generated in the multi-way valve (5) and in the pipes carrying the water as result of the sudden acceleration of flow at the time of a transition from one spray arm (12, 112) to another during consecutive operation (Figure 6).

In the dishwasher (1), object of the present invention, it is possible to avoid the noise generated as a result of the sudden acceleration of flow at the time of a transition from one spray arm (12, 112) to another, by setting the number of revolutions of the circulation pump (4) during the transition and, increase the washing performance by changing the revolution rate of the circulation pump (4) at predetermined time intervals within the cycle times of the arms (12, 112) Spray

Claims (2)

1. A dishwasher (1) comprising: a sump (3) in which water accumulates during the washing process; a circulation pump (4) that returns the water from the sump (3), and that is driven by an electric motor with variable speed; a high flow spray arm (12) in which water is sprayed to articles 5 to be washed at a high flow rate; operating the circulation pump (4) mainly at a high speed and; a low flow spray arm (112) in which the water is sprayed at a low flow, the circulation pump (4) operating primarily at a low speed; and while the spray arms (12, 112) are operated consecutively, the number of revolutions of the circulation pump (4) is kept constant at any of said high speed or low speed, during a 10 transition period (P) from the high flow spray arm (12) to the low flow spray arm (112) and from the low flow spray arm (112) to the high flow spray arm (12) , characterized in that the number of revolutions of the circulation pump (4) is modified in a predetermined interval (ΔT1, ΔT2) before and / or after a transition period (P) from an arm (12, 112) of spray to another. A control procedure for a dishwasher (1) comprising: a sump (3) in which water accumulates during the washing process; a circulation pump (4) that returns the water from the sump (3) and is driven by an electric motor with variable speed; a high flow spray arm (12) in which water is sprayed to the items to be washed at a high flow rate; operating the circulation pump (4) mainly at a high speed and; a low flow spray arm (112) in which the water 20 is sprayed at a low flow operating the circulation pump (4) mainly at a low speed, so that the procedure, while the spray arms (12, 112) are operated consecutively, comprises the steps of

-

keeping the number of revolutions of the pump (4) of constant circulation at any of said high speed or said low speed during a period (P) of transition from arm (12) of

25 high flow spray to the low flow spray arm (112) and from low flow spray arm (112) to the high flow spray arm (12), and -modify the pump speed (4) of circulation in a predetermined interval (ΔT1, ΔT2) before and / or after a period (P) of transition from one spray arm (12, 112) to another. A control procedure for a dishwasher (1) according to claim 2, comprising the following steps: while the spray arms (12, 112) are operated consecutively, the circulation pump (4) is operated at a high rate (N1) of revolutions during a period T1 -ΔT1, taking into account the high-flow spray arm (12), while the circulation pump (4) is operated at a low rate (N2) of revolutions during a period ΔT1; in the transition period (P), while the pump (4) of The circulation continues to operate at a low rate (N2) of revolutions, the cycle time (T1) of the high flow spray arm (12) ends, the cycle time (T2) of the low flow spray arm (112) begins; the circulation pump (4) is operated at a low rate (N2) of revolutions during a period T2 -ΔT2, while the circulation pump (4) is operated at a high rate (N1) of revolutions during a period ΔT2; in the transition period (P), while the circulation pump (4) continues to operate at a high rate (N1) of 40 revolutions, the cycle time (T2) of the low flow spray arm (112) ends, and the cycle time (T1) of the high flow spray arm (12) begins. 4. A control procedure for a dishwasher (1) according to claim 2, wherein the number of revolutions of the circulation pump (4) is kept constant during the cycle time (T2) of the arm (112) Low flow spray. A control procedure for a dishwasher (1) according to claim 2, wherein the number of revolutions of the circulation pump (4) is kept constant during the cycle time (T1) of the arm (12 ) high flow spray.