EP2977502A1 - Method for operating a centrifugal machine and centrifugal machine - Google Patents

Abstract

The invention relates to a method for operating a spinning machine with a container, a drum and a discharge device, wherein in a spin phase laundry is spun in the drum so that washing liquid is expelled from the laundry into the container and led out of the container by means of the drain device , A residual moisture content of the laundry or a residual moisture content dependent residual moisture parameter is determined. The spin phase is terminated as a function of the determined residual moisture content of the laundry or residual moisture parameter. Furthermore, the invention relates to a correspondingly designed centrifugal machine.

Description

The invention relates to a method for operating a centrifugal machine with a container, a drum and a discharge device, wherein in a spin phase laundry is spun in the drum so that wash liquor is expelled from the laundry into the container and led out of the container by means of the drain device ,

In the prior art document which has not been printed, a spin phase has a fixed period of time. The fixed period of time is determined by the program of the manufacturer of the centrifugal machine and deposited in individual programs. If a program loads a non-type-specific load such as slippers or rubber mats with a spin-intensive program for a terry load and / or a partial / reduced load, this has a negative effect on the life of the spinner. In addition, the laundry is unnecessarily burdened and the spin program unnecessarily extended. Depending on the loading situation and type of laundry, the laundry can therefore be thrown too long, whereby the laundry and the spinning machine are unnecessarily burdened. Especially loads with low drainage can generate high unbalance values. On the other hand, the case may occur that the laundry is not thrown long enough and the residual moisture content is too high. A subsequent drying process is then prolonged and uneconomical.

The invention thus raises the problem of providing a method for operating a spinning machine and a spinning machine more economically and / or with the lowest possible load for the spinning machine and / or the laundry.

According to the invention, this problem is solved by a method having the features of patent claim 1 and a spinning machine having the features of patent claim 8. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

A residual moisture content of the laundry or a residual moisture content dependent residual moisture parameter is determined. The spin phase is terminated as a function of the determined residual moisture content of the laundry or residual moisture parameter. This can be used to determine if and how much wash liquor is expelled from the wash, and the spin time can be adjusted to the amount of drainage.

The achievable with the present invention consist in addition to the protection of the laundry and / or the spinner in the achievement of repeatable residual moisture. In addition, shorter spin durations can be achieved depending on the type and quantity of load, which enables shorter overall program run times. The method may favor the dissolution and rinsing of buildup in the tub. Furthermore, the residual moisture content can be influenced via a drainage profile. The method is universally applicable to any spinner because the spinner does not need to be structurally altered. It is only necessary to change the software of the spinner.

The spin phase is preferably a final spin phase, i. a spin phase after which a washing program is completed and / or after which the laundry is provided for final drying, for example for a dryer or for hanging the laundry.

The laundry may not only be laundry of fabric such as clothing, bedding or curtains but also other items to be washed such as floor mats or flip-flops.

In a preferred embodiment, the residual moisture parameter is defined as a time period in which a level of wash liquor expelled from the laundry increases from a first level to a second level in the tub. The period is measured. The increase in wash liquor level over time indicates the amount of wash liquor expelled from the wash during spinning and is used as a drainage measure.

Preferably, the spin phase is terminated when the measured time period is greater than a predetermined time period. The specified period is programmed in the spinner. The specified period is program and machine dependent.

In a preferred embodiment, a drain valve of the drain device is closed in the spin phase so that wash liquor expelled from the wash is accumulated in the tub and the level of wash liquor increases from the first level to the second level in the vessel. The period of the increase is measured. The spin phase is ended when the measured time period is greater than the specified time period. The spin phase and the measurement of the time period between the rise of the wash level between the first and second levels are continued if the measured time is less than or equal to the predetermined time. The height of the first and second levels depends on the construction of the washer-extractor.

Preferably, the drain valve is opened so that the wash liquor is drained out of the tank by the drain when the level of the wash liquor reaches the second level, and the drain valve is closed when the level of the wash liquor reaches the first level. The time between closing and opening the drain valve is measured. The steps of opening and closing the drain valve are repeated until the measured period is greater than the predetermined period, i. as long as it is less than or equal to the given period. If the measured period is greater than the predetermined period, the spin phase is ended. By closing and opening the drain valve at predetermined wash liquor levels in the vessel and starting and stopping the measurement of the time period at the predetermined wash liquor levels in the vessel, the residual moisture content or parameter can be determined under reproducible conditions.

In one embodiment of the method, a speed at which the drum is rotated in the spin phase is constant. Preferably, the constant speed is a maximum spin speed of the spinner. In particular, in this variant, a defined dewatering quotient can be achieved depending on the laundry and load.

In another embodiment of the method, a speed at which the drum is rotated in the spin phase is increased stepwise. Preferably, the speed is increased stepwise up to the maximum spin speed of the spinner. In particular, in this variant, the machine protection can be increased compared to conventional methods.

The invention further relates to a spinning machine with a container, a rotatable drum mounted in the container for receiving laundry, a motor for rotating the drum, a drain device for removing liquor from the container, means for determining a residual moisture content of the laundry or one of the residual moisture content dependent residual moisture parameter and a control device, wherein the control device is arranged to control a spin phase according to the method described above in its embodiments and further developments.

The drain device preferably has a drain valve and a drain pipe. When the drain valve is opened, washing liquid driven out of the laundry by means of the drainage device in the spin phase is led out of the container into the drain pipe, which usually discharges into a sewer. When the drain valve is closed, washing liquid driven out of the laundry in the spin phase accumulates in the container because it can not be led out of the container by means of the drain device. The drain device is preferably at the bottom of the container, arranged based on the operating position of the spin machine. If the spinner is a washing machine, the container is the tub.

The control device is preferably designed to reduce the activity of the drain device, i. to control the opening and closing of the drain valve. Furthermore, it is preferably designed to control the motor for rotating the drum.

In a preferred embodiment, the means for determining a residual moisture content of the laundry or a residual moisture content dependent residual moisture parameter comprises sensor means for detecting a level of the washing liquid in the container and means for detecting a period of time in which the level of washing liquid driven out of the laundry is from a first Level rises to a second level in the container. The sensor means for detecting the level of the washing liquid in the container and the means for detecting the period may be formed separately or as a unit. They can also be part of the control device.

The spinning machine can be a machine used in the commercial sector or a domestic sling machine. The spinner can only be designed for spinning like a laundry centrifuge. Alternatively, the spinner may be designed for washing and spinning laundry such as a washing machine. The spinner may also be a combination device of a washing / spinning and / or drying machine.

Fig. 1

ein erfindungsgemäßes Verfahren im zeitlichen Ablauf; und

Fig. 2

einen Teilausschnitt aus Fig. 1.

An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. It shows

Fig. 1

an inventive method in time; and

Fig. 2

a partial section Fig. 1 ,

Fig. 1 shows a method according to the invention in the time sequence on the basis of a liquid level-time diagram. A level of wash fluid expelled from the wash during spinning is shown as a function of time during spinning. A line 2 shows a progression of the level of washing liquid driven out of the laundry in the container of the centrifugal machine during a spin-drying phase. A characteristic curve K represents the course of the level of washing liquid driven out of the laundry in the container of the centrifugal machine during the spin phase. A speed line D represents the course of the rotational speed of the drum during the spin phase. The spin phase begins at an initial time t _a . At the beginning of the spin phase, the speed is at a maximum spin speed elevated. The drain valve is open at the beginning of the spin phase, so that washing liquid can drain from the container. After the washing liquid has largely drained off, the drain valve is preferably closed after falling below a first level of the washing liquid, so that washing liquid driven out of the laundry accumulates in the container. After reaching a second level of the washing liquid, the drain valve is opened, so that the accumulated in the container washing liquid can run out of the container. If the level of the washing liquid falls below the first level, the drain valve is closed again until so much washing liquid accumulates in the tank that the washing liquid level reaches the second level. The drain valve is then reopened. That is, during the spin phase, the drain valve is closed when the wash liquid falls below the first level and opened when the wash liquid reaches the second level.

How out Fig. 1 As can be seen, the period between the opening and closing of the drain valve is relatively low. The spinner is designed so that the accumulated washing liquid from the container when you open the drain valve can flow quickly. The time between closing and opening the drain valve is measured. If the measured period is less than or equal to a predetermined period of time, the spin phase is continued, ie the steps closing and opening the drain valve alternate with the washing liquid in response to the first and second levels being reached and measuring the time between Closing and opening the drain valve will continue. If the measured period is greater than the predetermined period, the spin phase is ended. As can be seen in the characteristic curve K and the measured line 2, the discharge valve is opened and closed relatively frequently at the beginning of the spin phase because the level of the washing liquid expelled from the laundry rises relatively quickly from the first to the second level.

As the spin phase increases, the level of wash fluid expelled from the wash increases more slowly compared to the beginning of the spin phase. The measured period between the closing and opening of the drain valve is thereby greater with increasing spin phase time. At the time t _e , washing liquid driven out of the laundry reaches the second level. The drain valve is opened. The measured period between closing and opening the drain valve is greater than the predetermined period. The spin phase is ended. The speed of the drum is reduced to 0 rpm ^-1. The characteristic K coincides with the measured line 2 in the range of measuring tolerances. The process is reproducible.

Fig. 2 shows a partial section Fig. 1 who in Fig. 1 is indicated by II. In Fig. 2 is not the characteristic K but only the measured line 2 shown. When the drain valve closes, as the level of the washing liquid falls below the first level N ₁ , washing liquid driven out of the laundry begins to collect in the container. The level of the scrubbing liquid increases to the second level N ₂ over the period x ₂ that is measured. As in Fig. 2 can be seen in the spin phase carried out according to the course of the line 2, the second level N ₂ after the measured time x ₂ reached. The measured time duration x ₂ is greater than a predetermined time period x _N , in which, starting from the first level N _1, the second level N ₂ should be reached in order to consider a continuation of the spin phase to be meaningful.

A curve of the washing liquid level from the first level N ₁ to the second level N ₂ in the predetermined time period x _N is shown as a predetermined line N. The spin phase is terminated after measuring the time period x ₂ because it is greater than the predetermined time period x _N. Purely theoretically and only to illustrate the method is in Fig. 2 also a curve of a dashed theoretical line 1 shown. The theoretical line 1 following, the washing liquid level reaches starting from the first level N _1, the second level N ₂ in a period of time x. ₁ The time duration x ₁ is less than the predetermined time period x _N. Therefore, the spin phase would continue after the time period x ₁ .

LIST OF REFERENCE NUMBERS

D

Speed line

K

curve

N

predetermined line

N ₁

first level

N ₂

second level

t _a

Start time

t _e

end time

x _N

predetermined time duration

x ₁

first period of time

x ₂

second period of time

1

theoretical line

2

measured line

Claims (9)

Method for operating a spinning machine with a container, a drum and a discharge device, in which in a spin phase laundry is spun in the drum, so that washing liquid is expelled from the laundry into the container and led out of the container by means of the discharge device, characterized that a residual moisture content of the laundry or a residual moisture content dependent residual moisture parameter is determined and the spin phase is terminated as a function of the determined residual moisture content of the laundry or residual moisture parameter. A method according to claim 1, characterized in that the residual moisture parameter is defined as a period of time (dz, x ₂ ) in which a level of washing liquid expelled from the laundry from a first level (N ₁ ) to a second level (N ₂ ) increases in the container, and the period (x ₁ , x ₂ ) is measured. A method according to claim 2, characterized in that the spin phase is terminated when the measured period (x ₁ , x ₂ ) is greater than a predetermined period of time (x _N ). A method according to claim 3, characterized in that a discharge valve of the discharge device is closed in the spin phase, so that washing liquid driven out of the laundry is accumulated in the container and the level of the washing liquid is changed from the first level (N ₁ ) to the second level (N ₂ ) in the container, and that the spin phase is terminated when the measured time period (x ₂ ) is greater than the predetermined time period (x _N ), and the spin phase and the measurement of the time period (x ₁ ) continue measured period (x ₁ ) is less than or equal to the predetermined period (x _N ). A method according to claim 4, characterized in that the drain valve is opened, so that the washing liquid is led out of the container by means of the drain device when the level of the washing liquid reaches the second level (N ₂ ), and the drain valve is closed when the level the washing liquid reaches the first level (N ₁ ), and the steps of opening and closing the drain valve are repeated until the measured period (x ₁ , x ₂ ) is greater than the predetermined period (x _N ). Method according to one of the preceding claims, characterized in that a speed at which the drum is rotated in the spin phase, is constant. Method according to one of the preceding claims 1 to 5, characterized in that a rotational speed at which the drum is rotated in the spin phase, is gradually increased. Centrifugal machine with a container, a rotatable drum mounted in the container for receiving laundry, a motor for rotating the drum, a discharge device for removing washing liquid from the container, means for determining a residual moisture content of the laundry or a residual moisture content dependent residual moisture parameter and a control device , characterized in that the control device is set up to control a spin phase, according to a method according to one of claims 1 to 7. A spinning machine according to claim 8, characterized in that the means for determining a residual moisture content of the laundry or a residual moisture content dependent residual moisture parameter sensor means for detecting a level of the washing liquid in the container and means for detecting a period (x ₁ , x ₂ ), in the the level of wash fluid expelled from the wash increases from a first level (N ₁ ) to a second level (N ₂ ) in the container.

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