CN103924418A

CN103924418A - Dewatering control method of twin-tub washer

Info

Publication number: CN103924418A
Application number: CN201410167854.9A
Authority: CN
Inventors: 张湘建
Original assignee: Hefei Midea Laundry Appliance Co Ltd
Current assignee: Hefei Midea Laundry Appliance Co Ltd
Priority date: 2014-04-24
Filing date: 2014-04-24
Publication date: 2014-07-16
Anticipated expiration: 2034-04-24
Also published as: CN103924418B

Abstract

The invention discloses an intermittent-dewatering type dewatering control method of a twin-tub washer. The dewatering control method is characterized in that when a washing mode is finished and before a dewatering mode is executed, a dewatering preprocessing stage is set for the twin-tub washer; the dewatering preprocessing stage proceeds in the mode that in a first start and stop stage, after a dewatering tub is powered on and operates for 40 +/- 5 seconds, an outage lasts for 20 +/- 5 seconds, and a second start and stop stage is executed; in the second start and stop stage, after the dewatering tub is powered on and operates for 30 +/- 5 seconds, an outage lasts for 30 +/- 5 seconds, and a third start and stop stage is executed; in the third start and stop stage, after the dewatering tub is powered on and operates for 20 +/- 5 seconds, an outage lasts for 40 +/- 5 seconds, and the dewatering mode is executed. According to the dewatering control method of the twin-tub washer, violent resonance in the dewatering process can be effectively mitigated, so that the service life of the twin-tub washer is prolonged.

Description

A kind of two-tub washing machine dehydration control mode

Technical field

The present invention relates to a kind of water management mode of two-tub washing machine.

Background technology

Dewatering system in double-tube washing machine is made up of staving, dehydration barrel, safety head, water seal, dehydration electric motor, spin-drying timer etc., staving is square, for the framework of whole system, dehydration barrel is circular, bucket wall surrounding is evenly equipped with the circular hole that leaks, and starts timer when work, and dehydration electric motor energising running drives dehydration barrel to do High Rotation Speed, centrifugal force throws away the moisture on clothing by the circular hole that leaks of bucket wall surrounding, remove fast moisture content in clothing to reach the function of dehydration.

As shown in Figure 1, dehydration start-up course is divided two stages:

First stage is the start-up course of driven by motor load, this stage is that driven by motor dehydration barrel completes from zero transition to rated speed, in this process, in the time that the rotating speed of dehydration barrel and the intrinsic frequency of system approach or are equal (being that dehydrating speed is in 400-450 rev/min of interval through this state of experimental test), mechanical system will be in resonance state, amplitude obviously increases, but because toggle speed is very fast, dehydration barrel is shorter running time under resonance state, amplitude increases limited, and while being generally normal work, the 3-5 of amplitude doubly.

Second stage is to have excited system to have the stack of the free and forced vibration under certain initial displacement and initial velocity condition in the first stage, primary condition depends on the speed that the first stage starts, start soon, initial displacement and initial velocity are just little, the transient process of second stage is also just short, otherwise contrary.

Dehydration stopped process is also divided into two stages:

Although first stage motor power cuts off, dehydration barrel is under moment of inertia and damping torque effect, in speed reducing rotation state, below rotating speed is reduced to system frequency time, because rotating speed is low, centrifugal force is also very little, system has not been played to exciting effect, in speed reducing rotation process, in the time that excited frequency moves closer to system frequency (being that dehydrating speed is in 80-120 rev/min of interval through this state of experimental test), amplitude will increase, because damping torque is less, so dehydration stopped process is longer by the resonance region time compared with start-up course by resonance region, when amplitude while simultaneously crossing resonance region can reach the normal work of machinery conventionally, the 5-7 of amplitude doubly, amplitude is very big,

Second stage is decay free vibration, this free vibration decay speed depends primarily on the damping of system, damping comprises vibration damping and dehydration barrel gyrodaming, the time that gyrodaming affects the deceleration of rotor and crosses resonance region, also just mean the primary condition that affects second stage, the rate of decay of vibration damping impact vibration, if the initial displacement of second stage and initial velocity are little, when vibration damping is larger again, the second stage resonance time is little compared with short amplitude.

When user uses, clothing can not completely be folded and keep flat in dehydration barrel, clothing will present uneven distribution in dehydration barrel, cause the support system of washing machine to bear the excitation of complicated centrifugal force, this unbalanced centrifugal force excitation will cause washing machine high vibration, washing machine is because the restriction of complete machine structure and realize the performance requirement of high speed dewatering, the appearance of oscillation phenomenon can not be avoided, the frequency of exciting force is during close to system frequency, to there is violent resonance in system, this vibration is as eliminated not in time, will be to water seal of washing machine, shock-absorbing spring, the parts such as dehydration electric motor damage, cause mechanical disorder, affect service life.

Summary of the invention

The present invention is for evading the existing weak point of existing technology, propose a kind of two-tub washing machine between de-formula dehydration control mode, can effectively reduce the violent covibration in dehydration, thereby extend the service life of washing machine.

The present invention is that technical solution problem adopts following technical scheme:

The feature of the dehydration control mode of a kind of two-tub washing machine of the present invention is: complete washing mode and enter before dehydration mode at two-tub washing machine, dehydration pretreatment stage is set, the mode of operation of described dehydration pretreatment stage is:

The first start and stop stage: dehydration barrel energising running is after 40 ± 5 seconds, and power-off 20 ± 5 seconds, entered for the second start and stop stage;

The second start and stop stage: dehydration barrel energising running is after 30 ± 5 seconds, and power-off 30 ± 5 seconds, entered for the 3rd start and stop stage;

The 3rd start and stop stage: energising running is after 20 ± 5 seconds, and power-off 40 ± 5 seconds, enters dehydration mode;

Described dehydration pretreatment stage is for balancing clothing, reducing clothing offset with described the first start and stop stage; With described the second start and stop stage be used for reducing clothing offset, reduce load capacity; Be used for removing clothing moisture with described the 3rd start and stop stage, reduce load capacity and complete dehydration preliminary treatment.

Compared with the prior art, beneficial effect of the present invention is embodied in:

1, the present invention utilizes spin-drying timer that washing machine is set first to start dehydration pretreatment stage entering before normal dehydration mode, utilize the start-stop of different pitch times, balance clothing and removed moisture in clothing, while entering normal lasting dehydrating operation after load quality alleviates, the probability that just can resonate by resonance region the minimizing of system fast, thus the probability that related components lost efficacy reduced.

2, the present invention is entering before dehydration mode, by dehydration pretreatment stage, clothing is moved in dehydration barrel stacking smooth, clothing is evenly distributed in dehydration barrel, clothing offset is little, and load capacity reduces, and when high speed dewatering, system is just more stable, while continuing dehydration, can reduce the probability of resonance or enter high-speed smooth running status by resonance region fast, while shortening follow-up lasting dehydration, clothing be taken off to the dry time, thereby can efficiently complete at short notice the dehydration of clothing.

Brief description of the drawings

Fig. 1 is the displacement curve figure of rotary machine start-up course in prior art;

Fig. 2 is the present invention's the first start and stop stage dehydration barrel undergarment view;

Fig. 3 is the present invention's the second start and stop stage dehydration barrel undergarment view;

Fig. 4 is the present invention's the 3rd start and stop stage dehydration barrel undergarment view;

Number in the figure: 1 dehydration barrel; 2 dehydration clothings; Institute's water content in 3 clothings.

Detailed description of the invention

In the present embodiment, a kind of dehydration control mode of two-tub washing machine, is complete washing mode and enter before dehydration mode at two-tub washing machine, and dehydration pretreatment stage is set, and the mode of operation of dehydration pretreatment stage is:

As shown in Figure 2, the first start and stop stage: dehydration barrel energising running is after 40 ± 5 seconds, and power-off 20 ± 5 seconds, entered for the second start and stop stage; The effect in the first start and stop stage is for balancing clothing; Reduce clothing offset, switch on 40 ± 5 seconds time, its dehydrating speed approaches the frequency of 400 revs/min of system resonance, now timer power-off, dehydration barrel is subject to the effect of inertia, still at rotary dehydration, because there is no the active force of motor, its rotating speed is in continuous decline, and after 20 ± 5 seconds, rotating speed approaches the frequency of 120 revs/min of low speed resonance;

As shown in Figure 3, the second start and stop stage: energising running is after 30 ± 5 seconds, and power-off 30 ± 5 seconds, entered for the 3rd start and stop stage; The effect in the second start and stop stage is for reducing clothing offset, reduces load capacity; After balancing by the first start and stop stage clothing, moisture in clothing reduces, load capacity reduces, and spin-drying timer continues energising 30 ± 5 seconds, and its dehydrating speed approaches the frequency of 400 revs/min of system resonance, timer power-off, dehydration barrel is subject to the effect of inertia, still at rotary dehydration, because there is no the active force of motor, its rotating speed is in continuous decline, and after 30 ± 5 seconds, rotating speed approaches the frequency of 120 revs/min of low speed resonance;

As shown in Figure 4, the 3rd start and stop stage: energising running is after 20 ± 5 seconds, and power-off 40 ± 5 seconds, enters dehydration mode; The effect in the 3rd start and stop stage is for removing clothing moisture, again reducing load capacity; Clothing dewaters by balancing with inertia of the first two start and stop stage, clothing is more smooth in bucket, moisture further reduces, and after timer energising, 20 ± 5 seconds time, dehydrating speed approaches the frequency of 400 revs/min of system resonance, timer power-off, dehydration barrel is subject to the effect of inertia, still at rotary dehydration, because there is no the active force of motor, its rotating speed is in continuous decline, and after 40 ± 5 seconds, rotating speed approaches the frequency of 120 revs/min of low speed resonance.

By first three dehydration pretreatment stage clothing balance and dewater after laundry load in bucket, be uniformly distributed, moisture content reduces, load further reduces, now dehydration barrel is after the 3rd start and stop stage finished, spin-drying timer recycling dehydration electric motor control dehydration barrel directly enters the normal dehydration mode that continues, can quick and stable enter high-speed cruising dewatering state, and complete in the short period of time the dehydration of clothing, the stability of a system is good, in running, there will not be violent resonance, avoid vibration to water seal of washing machine, shock-absorbing spring, the parts such as dehydration electric motor impact destruction, reduce the probability of mechanical disorder, reduce the dehydrating operation time of clothing simultaneously, energy saving.

Claims

1. a two-tub washing machine dehydration control mode, is characterized in that: complete washing mode and enter before dehydration mode at two-tub washing machine, dehydration pretreatment stage is set, the mode of operation of described dehydration pretreatment stage is:

Described dehydration pretreatment stage is to reduce clothing offset with described the first start and stop stage for balancing clothing; With described the second start and stop stage be used for reducing clothing offset, reduce load capacity; Be used for removing clothing moisture with described the 3rd start and stop stage, reduce load capacity and complete dehydration preliminary treatment.