CN102747587B - Roller type washing machine - Google Patents

Abstract

Provided is a roller type washing machine, comprising a damper capable of further effectively suppressing vibration and noises. The roller type washing machine in an embodiment comprises: a casing; a water tank arranged inside the casing; a roller rotatably arranged inside the water tank; the damper arranged between the casing and the water tank and used for damping the vibration of the water tank; and a control unit used for performing variable control for a damping force of the damper. The control unit is configured to perform the control as follows, the control unit changes the damping force of the damper during the period that the roller rotates a circle, and periodically repeats the variable control according to the rotation of the roller.

Description

Tumbling-box washing machine

Technical field

Present embodiment relates to tumbling-box washing machine.

Background technology

Such as in tumbling-box washing machine, by the multiple suspensions configured between housing and tank, elastic bearing is carried out to the tank arranged in the enclosure, thus reduce the vibration of the tank that drum rotating causes.

As this suspension, in recent years, there is the idea using the damper of damping force variable, in damper, filled the magneto-rheological fluid (for example, referring to patent document 1) as functional fluid.

Such as, specifically, in cylinder body, while reciprocally bar is set, on the piston of this bar front end, arrange the coil for generation of magnetic field.The magneto-rheological fluid be housed in piston periphery and cylinder body in the space between enclosing can flow.Then, when tank vibrates at above-below direction, piston and cylinder body Relative Vibration, and also the resistance produced due to the viscosity of magneto-rheological fluid gives damping force, thus the vibration of decay tank.

At this, when being energized to coil, produce magnetic field and give magnetic field to magneto-rheological fluid, thus the viscosity of magneto-rheological fluid improving.Thus, the resistance between piston and cylinder body increases, thus piston is relative to being difficult to move, and strengthens damping force.

At first technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2008-295906 publication

Summary of the invention

In tumbling-box washing machine, there is multiple resonance point (resonant frequency), along with the rising of drum rotation speed, tank occurs mainly in the resonance of above-below direction vibration and the resonance etc. in left and right directions vibration.

But, in tumbling-box washing machine in the past, there is no the vibration mode of complete corresponding tank, so be not adequate by the vibration of damper or the inhibition of noise.

Therefore, object is to provide a kind of tumbling-box washing machine with damper, more effectively can suppress vibration or noise.

The tumbling-box washing machine of present embodiment, it possesses: shell; Tank, is located in above-mentioned shell; Cylinder, is rotatably located in above-mentioned tank; Damper, is located between above-mentioned shell and above-mentioned tank, for the vibration of above-mentioned tank of decaying; Control unit, carries out variable control to the damping force of above-mentioned damper.Control unit can control as follows, changes the damping force of above-mentioned damper in the process that above-mentioned drum rotating one encloses, and according to the rotation of above-mentioned cylinder, periodically repeats this variable control.

Thus, can provide tumbling-box washing machine, the periodicity cogging that can cause with drum rotating accordingly, is carried out the precise hard_drawn tuhes changing damping force in the process of enclosing at drum rotating one, thus can be improved the inhibition of vibration and noise.

Accompanying drawing explanation

Fig. 1 represents the first embodiment, represents the schematic diagram of the relation between the swing circle of cylinder and the damping force of left and right damper.

Fig. 2 is the longitudinal cross-sectional side view of tumbling-box washing machine.

Fig. 3 is the longitudinal section of suspension entirety.

Fig. 4 is the block diagram representing electrical configurations.

Fig. 5 is the schematic diagram of the relation represented between the phase place of unbalance position and q shaft current.

The a of Fig. 6 is the schematic diagram for illustration of the relation between cylinder revolution and the left and right directions amplitude of tank, and the b of Fig. 6 is the ideograph representing this left and right directions amplitude in washing machine.

The a of Fig. 7 is the schematic diagram for illustration of the relation between cylinder revolution and the above-below direction amplitude of tank, and the b of Fig. 7 is the ideograph representing this above-below direction amplitude in washing machine.

Fig. 8 is the schematic diagram for illustration of the left and right directions of tank and the switching time of above-below direction amplitude and control model.

Fig. 9 is Fig. 1 isoboles of the damping force representing the damper switched after control model.

Figure 10 represents the second embodiment, the ideograph of the relation between the phase place of unbalance position and vibration detecting unit export.

Figure 11 be export for illustration of the phase place of unbalance position and q shaft current and vibration detecting unit between the schematic diagram of relation, a of Figure 11 be represent cylinder rotate to be 100rpm time state diagram, the b of Figure 11 be represent cylinder rotate to be 200rpm time state diagram.

Reference numeral:

1: shell 5: control unit (swing circle detecting unit) 6: tank

7a, 7b: suspension 10: cylinder 23: damper 20a, 20b: swing circle detecting unit (vibration detecting unit ... vibrating sensor) 54: swing circle detecting unit (cogging detecting unit ... current sensor)

Detailed description of the invention

First embodiment

Below, referring to figs. 1 through Fig. 9, the first embodiment is described.Fig. 2 is the integrally-built schematic diagram representing tumbling-box washing machine (hereinafter referred to as washing machine).As shown in the drawing, shell 1 is the box like forming washing machine shell layer, at the central portion on this front face side (right side of this figure), while being formed with washings gateway 2, is provided with the door 3 for opening and closing gateway 2.And, be provided with guidance panel 4 on the top of shell 1 front face, be provided with the control device 5 running and control in its inboard.

The tank 6 of transverse axis cylindrical shape is equipped, this tank 6 orientation of its axis fore-and-aft direction in the inside of shell 1.Tank 6 is by multiple (such as pairing left and right) suspension (only illustrate one in fig. 2, represent with Reference numeral 7b), and the acclivitous state in former side is resiliently supported on the base plate 1a of shell 1.Further, the concrete formation about suspension 7a, 7b of present embodiment is aftermentioned.

At the rear end side central part of tank 6, be equipped with the motor 8 be such as made up of DC brushless motor.Motor 8 is external-rotor motors, by being arranged on the not shown rotating shaft of this rotor 8a central part, inserting in the inside of tank 6, and be connected with the rear end side central portion of cylinder 10 via bearing block 9.

Cylinder 10 is disposed in the inside of tank 6, and as accommodating the Wash tub of washings.Cylinder 10 transverse axis in orientation of its axis fore-and-aft direction is cylindric, and be connected with the rotating shaft of motor 8 and supported with and the acclivitous state in front side concentric with tank 6, motor 8 is driven directly as driver element by cylinder 10.

Cylinder 10 on its week sidepiece (main part), whole region is formed multiple can the aperture 11 of water flowing and ventilation, tank 6 is configured to almost aporate can retaining in addition.In addition, cylinder 10 and tank 6, each comfortable front face has opening portion 12 and 13.

Between the opening portion 13 and washings gateway 2 of tank 6, the retractable sack 14 of ring-type is installed.Thus, washings gateway 2, by retractable sack 14, the opening portion 13 of tank 6 and the opening portion 12 of cylinder 10, is communicated to the inside of cylinder 10.Further, on the minimum position of tank 6, drainpipe 15 is connected with by draining valve 15a.

In washing machine, from the rear side of tank 6 upward and, be equipped with the drying device 16 as drying unit forward.This drying device 16 is made up of air-supply arrangement 18, heater 19 and the circulation airduct 17 with not shown Dehumidifying element etc., by repeatedly carrying out dehumidifying to the moisture in the air of discharging in tank 6, heating, the circulation returned in tank 6, thus the washings in drying drum 10.

At front part and the rear quadrate part on tank 6 top, be equipped with vibrating sensor 20a, 20b (with reference to Fig. 2, Fig. 4) respectively.This vibrating sensor 20a, 20b are such as made up of acceleration sensor, as unbalance in occurred when cylinder 10 rotates, then the vibration of the tank 6 that the vibration that can detect this cylinder 10 causes.

In detail as aftermentioned, vibrating sensor 20a, 20b and control device 5, while detecting swing circle when cylinder 10 rotates, as the device of the vibration for detecting tank 6.

Secondly the formation of above-mentioned suspension 7a, 7b is described.

As shown in Figure 2, suspension 7a, 7b possess: cylinder apparatus 30, are arranged on the installing plate 21 of base plate 1a side of shell 1; Axle 24, can insert in this cylinder apparatus 30 up or down, and upper end is arranged on the installing plate 6a of tank 6 side; Helical spring 25, is arranged between this axle 24 and cylinder apparatus 30.

Cylinder apparatus 30 and axle 24 form the damper 23 of present embodiment, with helical spring 25 together, (with reference to the b of Fig. 6) in symmetric configuration relative to tank 6.Thus, pairing left and right suspension 7a, 7b of above-below direction connected with outer casing 1 and tank 6 is formed in.

In detail, as shown in Figure 3, above-mentioned cylinder apparatus 30 possesses: iron cylinder body 22 cylindrically; Be embedded in the cylinder body connecting portion 30a of this cylinder body 22 bottom; Be disposed in the magnetic field generation device described later 40 etc. of cylinder body 22 inside.

Cylinder body connecting portion 30a is fastened on (with reference to Fig. 2) on the installing plate 21 of base plate 1a across nut such as the elastic seat boards such as rubber 26 grade 27, thus is fixed on the installing plate 21 of base plate 1a by cylinder apparatus 30.

On the other hand, axle 24 possesses: axle main part 24a, is inserted in the inside of cylinder apparatus 30; Axle connecting portion 24b, is connected to the upper end of axle 24 integratedly.In axle 24, at least axle main part 24a is made up of magnetic material made of iron.

Axle connecting portion 24b is fastened on the installing plate 6a of tank 6 across nut such as the elastic seat boards such as rubber 28 grade 29, thus forms the syndeton of axle 24 one vibration on above-below direction or left and right directions etc. along with the vibration of tank 6.

As shown in Figure 3, its bottom of helical spring 25 is supported by the upper end of cylinder apparatus 30, and the discoideus spring stop portion 49 that upper end is configured in axle 24 top stops.Thus, helical spring 25 is configured to, to the state that axle 24 exerts a force from cylinder apparatus 30 mode that namely top is drawn outward.

Upper and lower part in the cylinder body 22 of cylinder apparatus 30, across spacing arrange be fixed with bearing unit 33,39, this bearing unit 33,39 for vertically can straight reciprocating motion ground bolster 24.In the middle part clipped by this upper and lower pair of bearings unit 33,39, contain magnetic field generation device 40 and magneto-rheological fluid etc.

Downside bearing unit 33 possesses: bearing cage part 31, and collecting is fixed on the pars intermedia of the above-below direction in cylinder body 22; Bearing 33a, collecting is fixed in this bearing cage part 31.Bearing cage part 31 is such as formed by the nonmagnetic substance of aluminum, in hollow tube-shape, has the groove portion 32 along the circumferential direction extended at its outer part.

The surrounding wall portion of cylinder body 22, clamps to give prominence to the inside by the part corresponding with groove portion 32, thus is fixed in cylinder body 22 by bearing cage part 31.

Bearing 33a is the sintered oil-retaining bearing in the form of a ring that copper system nonmagnetic substance is formed.Bearing 33a be fitted be fixed on bearing cage part 31 inner peripheral portion on, and form as sliding bearing, this sliding bearing is as reciprocally bolster 24 on axial above-below direction.

On the top side of the bearing 33a in bearing cage part 31, press-in maintains an encapsulant 38c.Further, the bottom of axle 24 is provided with locating snap ring 34, this locating snap ring 34 is by being connected to below bearing cage part 31, and restrictive axes 24 is moved upward and comes off.

Upper shaft bearing unit 39 possesses: bearing cage part 35, and collecting is fixed on the inside of cylinder body 22 upper end; Bearing 39a, collecting is fixed in this bearing cage part 35.Bearing cage part 31 such as nonmagnetic substance by aluminum same with downside bearing cage part 31 is formed, in hollow tube-shape.

Bearing cage part 35 is little stepped in large and first half footpath in Lower Half footpath, on the lateral surface of large cylinder portion, its footpath 35a, has the groove portion 36 along all-round formation.

The surrounding wall portion of cylinder body 22, makes it give prominence to the inside by such as carrying out roll extrusion to the part corresponding with above-mentioned groove portion 36, thus bearing cage part 35 is fixed on the upper end of cylinder body 22.

Further, be provided with in groove portion 36 there is flexible O type ring 37.O type ring 37 by carrying out above-mentioned cramping to groove portion 36 and keeping being close to state, thus reliably can prevent water from immersing in cylinder body 22 while rigid bearing holding member 35.

In the outer part of bearing cage part 35, be formed in the stage portion 35c at the line of demarcation place of footpath little cylinder portion 35b and large cylinder portion, footpath 35a, the bottom of supporting helical spring 25.In addition, bearing cage part 35 also plays a role as spring retaining member, and this spring retaining member is used for the lateral surface of little for footpath cylinder portion 35b to keep from side relative to the bottom diameter of helical spring 25.

The bearing 39a sintered oil-retaining bearing in the form of a ring that by nonmagnetic substance formed same with above-mentioned bearing 33a.

At the empty internal of bearing cage part 35, except bearing 39a, on the downside of it, such as press-in maintains two encapsulants 38a, 38b.Encapsulant 38a, 38b and above-mentioned encapsulant 38c are oil sealing, and this oil sealing is insert molded the what is called of becket without spring-loaded oil seal in the rubber main body with sealing flange.

Above-mentioned becket is different from the ironwork in general oil sealing, such as, be made up of the nonmagnetic substance of aluminum.

And the interior shape of bearing cage part 35, the ladder hollow form that also diametrically size is different, in the footpath large inner 35d corresponding to 35a position, large cylinder portion, footpath, press-in has encapsulant 38a, 38b continuously up and down.At the empty internal of bearing cage part 35, be formed with less than its footpath and for being pressed into bearing 39a the little inner 35e in footpath continuously with the top of footpath large inner 35d.

Further, in bearing cage part 35, be formed with the inserting hole 35f of the further path that can be formed for the stage portion preventing bearing 39a from coming off upward, in this inserting hole 35f, insert axle 24.

Above-mentioned magnetic field generation device 40 possesses: bobbin 43U, 43D, point two sections configuration around axle 24; Coil 41U, 41D, be wrapped on these bobbins 43U, 43D; Three yoke 42a ~ 42c.

At bobbin 43U, 43D and insert between the peripheral surface of the axle 24 of the hollow bulb as its center, be formed with the space of tubular.

On the upside of bobbin 43U and on the downside of bobbin 43D, be configured with yoke 42a and yoke 42c, and be configured with yoke 42b between these bobbins 43U, 43D.There is between the hollow bulb of yoke 42a ~ 42c and the peripheral surface of axle 24 narrow and small space (such as, about 0.4mm), and be communicated with the space be formed on above-mentioned bobbin 43U, 43D, thus be formed in the cylindric space of above-below direction extension.Further, upper lower coil 41U, 41D are one another in series connection.

Magnetic field generation device 40 is on bobbin 43U, 43D while package coil 41U, 41D, under the state of configuration yoke 42a ~ 42c described above, such as, be molded with resin (in figure reference resin forming part 44) by thermoplastic resin (nylon, PBT, PET, PP etc.).

Thus, bobbin 43U, 43D in magnetic field generation device 40, coil 41U, 41D, yoke 42a ~ 42c integralization.Therefore, the while that this magnetic field generation device 40 being interstitial around axle 24, closed the upper and lower end parts in this space by upper-lower seal material 38b, 38c, thus form the resettlement section 50 of tubular.

In addition, the encapsulant 38a of topmost by carrying out dual sealing to the blocked styate of resettlement section 50, thus can realize firm closed while reliably prevent from soaking from upper side.

Magneto-rheological fluid 45 is housed in above-mentioned resettlement section 50, and this magneto-rheological fluid 45 is fluids that viscosity changes along with the applying of electric energy, and viscous characteristics changes according to the intensity in magnetic field.

This magneto-rheological fluid 45 such as the ferromagnetism such as iron, carbonyl iron particle dispersion is formed in the base oil based on polyolefin oil, when applying a magnetic field, and the catenulate cluster of ferromagnetic particles shape, thus there is the characteristic improving apparent viscosity.

Supplying to this resettlement section 50 under magneto-rheological fluid 45 is the state forming resettlement section 50 by inserting magnetic field generation device 40 and bearing unit 33,39 etc. at axle 24, being injected by never illustrated inlet and carrying out.

Although eliminate detailed diagram, the magneto-rheological fluid 45 poured into such as accounts for about 70% ~ 80% of the whole volume in resettlement section 50, and remains 20% ~ 30% and occupied by air 48 (being represented by blank in the drawings).Direction of principal axis length L in resettlement section 50 shared by air 48 is set to, and the stroke of the axle 24 moved up and down than the vibration based on the dehydrating operation initial stage (resonance zone R1 described later) is little.

That is, in order to play the attenuation of magneto-rheological fluid 45 as far as possible, when the stroke of the axle 24 that vibration when supposing dehydration startup causes is 10mm, then above-mentioned direction of principal axis length L is set smaller than and equals 10mm.Like this, although resettlement section 50 was small gap originally, because its upper layer part is occupied by air 48, so the use amount of magneto-rheological fluid 45 can be reduced as far as possible.

And along with the vibration of tank 6, what axle 24 carried out move up and down exceeds the scope that air 48 contacts, so can contact with the magneto-rheological fluid 45 of lower layer side, even if thus the amount of magneto-rheological fluid 45 reduce and also can promote above-mentioned attenuation.

As mentioned above, under the state that axle 24 assembles magnetic field generation device 40 grade, these parts and axle 24 are together inserted into the assigned position of cylinder body 22, in this condition, to carrying out cramping process with the groove portion 32 of each bearing cage part 31,35,36 corresponding parts in cylinder body 22.

Thus, the parts in one stationary housing 22, thus form cylinder apparatus 30.Further, in the bottom of cylinder apparatus 30, be formed with the blank part 30b that connection portion 30a closes, thus guarantee the space of allowing axle 24 movement downwards.

In addition, in this cylinder apparatus 30, insert helical spring 25 and be assembled into suspension 7a, 7b.Now, helical spring 25, between the stage portion 35c and above-mentioned spring stop portion 49 of bearing cage part 35, is installed with the state putting aside elastic force by compressing.

Like this, suspension 7a, 7b, on the above-below direction between the base plate 1a and tank 6 of shell 1 as above, under the state being positioned at shell 1 side, be configured in the left and right sides of tank 6 with cylinder apparatus 30.This suspension 7a, 7b configure approximately towards above-below direction with extending, and strictly speaking, exaggeration describes then narrow from front (b with reference to Fig. 6) upper portion gap ratio lower portion spacing each other, and be namely inclined to, it is larger that more past downside is separated by distance.

Damper 23 is made up of axle 24, cylinder body 22, magnetic field generation device 40, magneto-rheological fluid 45 etc.

Further, respectively from two wires 46 that coil 41U, 41D draw, outside is exported to by the lining 47 be located on cylinder body 22.This wire 46 is connected on control device 5 by not shown drive circuit, thus can carry out energising power-off control to the coil 41 of magnetic field generation device 40.

Dotted arrow A 1 shown in Fig. 3, A2, representing the magnetic circuit produced around coil 41U, 41D along with carrying out being energized to coil 41U, 41D, representing this magnetic direction simultaneously.

Further, form the axle 24 of magnetic circuit A1, A2, yoke 42a ~ 42c, cylinder body 22 each parts formed by magnetic made of iron.

Fig. 4 is the block diagram representing electrical configurations.Control device 5 is formed with microcomputer substantially, is the control unit of the whole action of washing machine of the washing for controlling the washings comprised in cylinder 10, dehydration, dry washing stroke ~ dry trip.

Control device 5 has such as ROM51a, RAM51b and EEPROM51c as memory cell.The control program of the whole services such as the washing operation for controlling washing machine or various data are stored in ROM51a.

Following signal is inputted to control device 5, namely, freely be located at the various operation signals of the operating portion 52 that the various console switch on guidance panel 4 are formed, from the rotation detection signal for detecting the turn-sensitive device 53 that motor 8 rotates, from the vibration detection signal for detecting vibrating sensor 20a, 20b that tank 6 vibrates, further, from the current detection signal etc. of the current sensor 54 for detecting the electric current flowing through motor 8.

Control device 5, based on the detection signal from turn-sensitive device 53, carries out by motor 8 (cylinder 10) revolution divided by the computing detecting required time, and detects the rotary speed of cylinder 10 based on this operation result.And control device 5 calculates amplitude (vibration values) based on the detected value of vibrating sensor 20a, 20b, or calculates q shaft current described later based on the current detection signal from current sensor 54.

Control device 5 pairs of motors 8 carry out vector controlled.Vector controlled is, will flow through the electric current of armature coil, is divided into the flow direction of the permanent magnet in so-called magnetic field and the direction orthogonal with it, and adjusts separately these electric currents, thus controls the torque of magnetic flux and generation.

Current Control uses the current value represented with the coordinate system, i.e. the d-q coordinate system that together rotate with the rotor 8a of motor 8, and d axle represents that q axle represents the direction orthogonal with d axle by the flow direction being arranged on epitrochanterian permanent magnet and being formed.

Q shaft current as the q axle composition of the electric current of flowing through coil is the composition (moment component electric current) producing rotating torques, and the d shaft current as the d axle composition of the electric current of flowing through coil is the composition (excitation or magnetization composition electric current) forming magnetic flux.

Therefore, when the biased generation non-central load (namely imbalance state) due to the washings in cylinder 10 causes its rotating torques to become large, q shaft current also becomes large.So the size based on q shaft current can detect the cogging size of motor 8.

At this, Fig. 5 represents that the washings W position be biased in cylinder 10 is 0 degree, and the cogging of two circles (360 degree × 2) when such as rotating in a clockwise direction from cylinder 10 viewed from front.

Use curve T in Figure 5 ₁₀₀the torque represented, because washings W exists gravity, maximum when the washings W in cylinder 10 is in 180 degree of uppermost position in fig-ure, and minimum when washings W is in 360 degree (0 degree) put lowermost position.And as shown in Figure 5, torque is often revolved to turn around with cylinder 10 and is just drawn the mode change of cyclic curve, thus can detect unbalance phase place.

As mentioned above, current sensor 54 and control device 5 are as the cogging detecting unit for detecting motor 8 cogging and the swing circle detecting unit for detecting cylinder 10 swing circle.

And, control device 5 based on above-mentioned input signal or detection signal and the control program be stored in advance in ROM51a or EEPROM56c and data, to the display part 55 for display setting content, the feed water valve 56 supplied water in tank 6, motor 8, draining valve 15a, for driving the motor 18b of the blowing fan 18a of air-supply arrangement 18 (with reference to Fig. 1) and sending drive control signal for the drive circuit 57 of drive coil 41U, 41D.

And as shown in Fig. 1, Fig. 6, the control device 5 of present embodiment, while carrying out variable control respectively, performs cylinder 10 and often revolves the periodicity control making damping force increase and decrease when turning around left side suspension 7a and right side suspension 7b.

Specifically, such as, when cylinder 10 revolves clockwise and turns around, in the suspension 7a of left side, as shown in a of Fig. 1, be energized to coil 41U, 41D (hereinafter referred to as coil 41) in the scope that unbalance phase place is 0 degree ~ 90 degree, be also energized to coil 41 in the scope of 180 degree ~ 270 degree.In the suspension 7b of right side, as shown in the b of Fig. 1, be energized to coil 41 in the scope that unbalance phase place is 90 degree ~ 180 degree, be also energized to coil 41 in the scope of 270 degree ~ 360 degree.

That is, control device 5 is based on the current detection signal from current sensor 54, and the ON/OFF of repeatedly carrying out when cylinder 10 often rotates 1/4 circle controls, and the damping force of left side suspension 7a and right side suspension 7b is alternately increased.

Also describe as in Action Specification below, periodically controlled by this, can greatly improve the control effects vibrated in low-speed region.

Secondly, the effect of above-mentioned formation is described with reference to Fig. 7, Fig. 8.

First, user opens the power switch (not shown) in washer operation portion 52, carries out washing the setting operation run, then control device 5 such as carries out washing operation according to washing stroke ~ dry trip order.

Further, the washing of present embodiment runs and refers to, comprises the general designation of the operation of the arbitrary stroke in washing stroke ~ dry trip, comprises various washing and runs.

The energising of the coil 41 of suspension 7a, 7b is controlled, in running with washing the vibration of tank 6 become large during set accordingly.Time below to accelerate in dehydrating stroke, such as cylinder 10 from rotate motor 8 till reaching stabilized (steady-state) speed rotary speed upward stroke be that example is described.

In dehydrating stroke, improve the rotary speed of motor 8 (cylinder 10) gradually, and utilize centrifugal force to throw the water remained in washings away discharge.In this rotary speed upward stroke, particularly in a of Fig. 6, there is the first resonance that tank 6 mainly carries out with left and right directions vibrating in the region represented with R1.

At this, as shown in the pattern of the b of Fig. 6, the side-to-side vibrations of response tank 6, suspension 7a, 7b axle 24 by being connected with tank 6, with the bottom of self (part of installing on above-mentioned base plate 1a) for fulcrum rocks from side to side.Now, due to the viscosity of the magneto-rheological fluid 45 in damper 23, give frictional resistance to the reciprocating motion of axle 24, thus the vibration amplitude of tank 6 of decaying rapidly.

In addition, as shown in Figure 1, at the beginning, control device 5 is energized and power-off control to left and right suspension 7a, 7b based on the current detection signal from current sensor 54 dehydrating stroke, when cylinder 10 often rotates 1/4 circle, to make the energising switching alternating with each other to coil 41.

When coil 41 is energized and produces magnetic field, around coil 41, form magnetic circuit A1, A2, then the viscosity of magneto-rheological fluid 45 improves rapidly, thus increases the resistance to axle 24.

And, now as shown in Figure 1, with unbalance phase place accordingly, cylinder 10 revolve turn around time, twice ON/OFF control is carried out to the coil 41 of left side suspension 7a, and with this on the left of the coil 41 of mode to right side suspension 7b of energising alternate energisation of suspension 7a carry out twice ON/OFF control.

By carrying out this rotation according to cylinder 10 by variable controlling periodic ground control repeatedly, in suspension 7a, 7b, the damping force of each damper 23 alternately increases.Like this, in the present embodiment, perform variable control, when namely rotating clockwise from cylinder 10 viewed from front, every 90 degree, the damping force of each damper 23 of suspension 7a, 7b alternately increases, thus in the scope that unbalance phase place is 0 degree ~ 90 degree, the damping force of left side suspension 7a increases relatively (with reference to Fig. 1 a), and the damping force of right side suspension 7b reduces (b with reference to Fig. 1) relatively.

At this, in a of Fig. 6, represent with the curve S 1c that two-dot chain line represents, the vibration amplitude of the left and right directions of tank 6 when execution cycle property controls.Curve S 2 indicated by the solid line represents, in the rotary speed upward stroke of motor 8, and the vibration amplitude of the above-mentioned left and right directions of (with reference to Fig. 9) when continuing to be energized to the coil 41 of two suspensions 7a, 7b.

From a of Fig. 6, to the vibration of the left and right directions of tank 6, when implementing the periodicity control of curve S 1c, although reduce by half conduction time, be also that of obtaining better attenuating (weakening effect).

This can be understood as, and for the vibration of the left and right directions of tank 6, carries out variable control, by with unbalance phase place accordingly, cylinder 10 revolve turn around during change the damping force of damper 23, its inhibition can be improved.

Further, R1 represents first resonance region in the drawings.

On the other hand, in a of Fig. 7, represent with the curve S 3c that two-dot chain line represents, the vibration amplitude of the above-below direction of tank 6 when execution cycle property controls.The curve S 4 represented with downside solid line represents, in the rotary speed upward stroke of motor 8, and the vibration amplitude of the above-mentioned above-below direction of (with reference to Fig. 9) when continuing to be energized to coil 41U, 41D of two suspensions 7a, 7b.

From a of Fig. 7, to the vibration of the above-below direction of tank 6, continue the high damping force set condition keeping each damper 23, the vibration as the above-below direction of its stroke directions is able to larger suppression.This trend, along with the raising of cylinder 10 rotary speed is more obvious.

In addition, in the Fig. 8 above-mentioned curve S 1c ~ S4 superposition represented, in the R1 of first resonance region, the amplitude of the left and right directions of tank 6 is maximum, and the amplitude of above-below direction is relatively little.Afterwards, along with the raising of cylinder 10 rotary speed, the amplitude of left and right directions progressively declines, and the amplitude of above-below direction increases gradually.

So, in order to effectively suppress left and right directions vibration and the above-below direction vibration of tank 6, control device 5, when reaching the regulation rotary speed represented with Vc in Fig. 8, the control model of switching suspension 7a, 7b.

That is, in ROM51a, be previously stored with the regulation rotary speed Vc for switching control model, this rotary speed Vc is such as set as, the rotary speed (with reference to first resonance region R1) that tank 6 produces left and right directions resonance and the value produced between rotary speed (reference subresonance region R2) that above-below direction vibrates.

Then, control device 5 is based on the detection signal from turn-sensitive device 53, when judging that the rotary speed of cylinder 10 reaches Vc, periodicity according to Fig. 1 controls, coil 41 to two suspensions 7a, 7b is energized, thus switches to the control (with reference to Fig. 9) of this "on" position lasting.

As shown in phantom in fig, in the first resonance region R1 occurring the dehydrating stroke that tank 6 resonates, control device 5, by execution cycle property control system of switching on or off electricity, can reduce the essence conduction time of half, and effectively suppresses left and right directions vibration (with reference to curve S 1c).

In addition, when the rotary speed of cylinder 10 reaches more than Vc, as shown in Figure 9, control device 5 continues to be energized to the coil 41 of suspension 7a, 7b.Thereby, it is possible to be all set to higher by the damping force of the damper 23 of each suspension 7a, 7b, thus the vibration of the above-below direction of tank 6 is made to diminish (curve S 4 with reference to Fig. 8).

Like this, even if the high-speed region after the R2 of subresonance region (rotary speed is the velocity band of more than Vc), also can avoid the resonance that tank 6 occurs, thus improve the performance of cylinder 10 rotary speed rising, can steady rotation speed be risen to.

Further, resonance zone in the present embodiment refers to, the region near the resonance point comprising resonance point (resonant frequency), first resonance region R1 is the resonance zone belonged in the multiple resonance points existed in washing machine compared with lower frequency region.

As mentioned above, the tumbling-box washing machine of present embodiment possesses: to be located between shell 1 and tank 6 and the damper 23 of suspension 7a, 7b of vibrating for tank 6 of decaying, with the control device 5 of the damping force for this damper 23 of variable control, control device 5 can control as follows, the damping force changing damper 23 in the process turned around is revolved at cylinder 10, and according to the rotation of cylinder 10, periodically repeat this variable control.

So the weight due to the washings W in washing machine intermediate roll 10 causes to revolve in the process turned around at cylinder 10 cogging occurs, so according to the damping force of this cyclomorphosis damping force 23, the vibration of tank 6 just effectively can be suppressed.

That is, by rotating the cycle cogging that causes accordingly with cylinder 10, carrying out revolving in the process turned around at cylinder 10 superprecision changing damping force change and controlling, can vibration suppressioning effect be improved.

Further, in general suspension, in order to a raggle, axle is configured to above-below direction, so the vibration of above-below direction to tank, the original effectiveness in vibration suppression of damper can be expected, but vibration (vibration of left and right directions) effectiveness in vibration suppression is in addition not adequate.

This point, as present embodiment, when watching from front (direction of principal axis), tank 6 possesses the structure of pairing left and right suspension 7a, 7b, and controls by carrying out periodicity to the damper 23 about it, effectively can also suppress the vibration of the left and right directions of tank 6.

In addition, possess the swing circle detecting unit for detecting cylinder 10 swing circle, control device 5, based on the swing circle detected by swing circle detecting unit, performs and controls the periodicity of damper 23.

By swing circle detecting unit, accurately according to the swing circle of unbalance phase place and actual drum 10, the damping force of damper 23 can be changed.Thus the inhibition of vibration or noise can be improved further.

Further, swing circle detecting unit is not limited in current sensor 54 or control device 5, as the detailed description of the second embodiment described later, also can adopt vibrating sensor 20a, 20b.

Possess motor 8 that cylinder 10 is rotated and the cogging detecting unit for detecting this motor 8 cogging, control device 5, based on the cogging cycle detected by cogging detecting unit, performs and controls the periodicity of damper 23.

In it is possible to accurately hold unbalance phase place based on cogging, the damping force of damper 23 can be changed according to the actual swing circle of cylinder 10.Further, cogging detecting unit can with relatively low cost and simple structure formed, such as adopt the current sensor 54 etc. for detecting the electric current flowing through motor 8.

Above-mentioned control device 5, at the low-speed region (first resonance region) of tank generation first resonance, namely tank 6 is main when left and right directions vibrates, and performs and controls the periodicity of damper 23.At the high-speed region (subresonance region) higher than this low-speed region, namely tank 6 is main when above-below direction vibrates, and performs the control that the damping force of damper 23 is uprised relatively.

So the vibration due to the above-below direction at high-speed region tank 6 becomes large, so correspondingly relatively improve the damping force of damper 23, thus the inhibition of vibration can be improved.Therefore, be different from the detection vibrated according to tank 6 and and vibrate become large time Variation control formation, the control of the vibration mode of corresponding tank 6 can be carried out in two regions of low-speed region and high-speed region, thus the generation vibrated can be suppressed in advance.

Little than ever in it is possible to the gap between tank 6 and shell 1 to be set to, thus the miniaturization realizing shell 1 maybe can increase the capacity of cylinder 10.

Second embodiment

The b of Figure 10 ~ Figure 11 represents the second embodiment, gives same-sign and omits same explanation, the following describes difference with previously described part same section.

Figure 10 is the output being equivalent to two circles rotations of vibrating sensor 20a, 20b (with reference to Fig. 1, Fig. 4) when representing the position biased in cylinder 10 of washings W cylinder 10 rotates clockwise as 0 degree.That is, shown in Fig. 10 curve P ₁₀₀exaggerate the output representing vibrating sensor 20a, 20b in the rotary speed (100rpm) of the rotary speed lower than the cylinder 10 during first resonance, known curve of output P ₁₀₀change with the cycle identical with cogging illustrated in fig. 5.

Further, as shown in a of Figure 11, when the rotary speed of cylinder 10 is 100rpm, the curve of output P of vibrating sensor 20a, 20b ₁₀₀present than above-mentioned cogging curve T ₁₀₀change little and mild curve.Like this, in vibrating sensor 20a, 20b rotary speed before first resonance occurs, curve of output P ₁₀₀the swing circle of cylinder 10 change little, so may be difficult to detect.

To this, the output of vibrating sensor 20a, 20b when the curve Pf in Fig. 10 represents first resonance, with curve P ₁₀₀(or cogging) compares phase delay 90 degree.Further, curve P ₂₀₀represent the output of vibrating sensor 20a, the 20b in the rotary speed (200rpm) of the rotary speed of the cylinder 10 when exceeding first resonance, with curve P ₁₀₀(or cogging) compares phase delay 180 degree.

Now, as shown in the b of Figure 11, because the rotary speed of cylinder 10 is relatively high, so the curve of output P of vibrating sensor 20a, 20b ₂₀₀change also obvious.And, as shown in the drawing, when the rotary speed of cylinder 10 is 200rpm, cogging curve P ₂₀₀variation little.

The b of comprehensive observing Figure 10 ~ Figure 11, when the known rotary speed when cylinder 10 is 100rpm, utilizes cogging (curve) T ₁₀₀, and based on the current detection signal from current sensor 54, can accurately detect unbalance phase place.

In addition, when the rotary speed of cylinder 10 is 200rpm, the curve of output P of vibrating sensor 20a, 20b ₂₀₀and there is the skew of 180 degree between unbalance phase place, but accurately can detect the swing circle of cylinder 10.

Therefore, in ROM51a, store rotary speed (output of such as vibrating sensor 20a, 20b is to the rotary speed in the moment of above-mentioned phase delay 180 degree), this rotary speed is as the index of the unit switched for detecting swing circle.

Then, control device 5, in rotary speed upward stroke, based on the detection signal from turn-sensitive device 53, when judging that the rotary speed of cylinder 10 reaches the rotary speed that delay 180 degree occurs, perform control swing circle detecting unit being switched to vibrating sensor 20a, 20b from current sensor 54.

Also have, when the rotary speed of cylinder 10 is 200rpm, the output of vibrating sensor 20a, 20b is than unbalance phase delay 180 degree, but as shown in Figure 1 with 180 degree of cycles, variable control is carried out to damper 23 time, without the need to the unbalance phase place of output computing based on vibrating sensor 20a, 20b, also can carry out periodicity identically with the first embodiment and control.

As mentioned above, control device 5, as swing circle detecting unit or the unit for detecting unbalance phase place, possesses the current sensor 54 as cogging detecting unit and vibrating sensor 20a, the 20b as vibration detecting unit.

And, the current sensor 54 as cogging detecting unit of the side that choice for use exporting change is large in the relation of the rotary speed with cylinder 10 and vibrating sensor 20a, the 20b as vibration detecting unit.Independently unbalance phase place is accurately detected thereby, it is possible to change with the rotary speed of cylinder 10.

In the present embodiment, " periodically variable control " is not limited in above-mentioned ON/OFF and controls.That is, the size of current of flowing through coil 41 is divided into big current I _land small area analysis I _stime (I _l> I _s), also can be substituted in low-speed region the control (with reference to Fig. 1) repeating "on" position and off-position, and repeat big current I when execution is often revolved turn around according to cylinder 10 _land small area analysis I _s"on" position periodicity control.

And, in high-speed region, perform the control relatively higher than low-speed region of the damping force of damper 23.Specifically, perform in low-speed region at small area analysis I _sthe control of lower repetition "on" position and off-position, and perform in high-speed region at big current I _lthe control of lower repetition "on" position and off-position, thus the vibration in high-speed region R2 and noise can be suppressed.

In addition, although each coil 41 configures with two sections by suspension 7a, 7b, as being made up of a coil, also numerous variations can be carried out.

Above, describe several embodiment of the present invention, these embodiments exemplarily propose, and do not mean at the protection domain limiting invention.These new embodiments can be implemented with other various ways, in the scope not departing from invention aim, can carry out various omission, replacement, change.These embodiments or its distortion, in the protection domain being contained in invention or aim, be also contained in the invention and its equivalent protection domain recorded in claims.

Claims (4)

1. a tumbling-box washing machine, is characterized in that, possesses:

Shell;

Tank, is located in above-mentioned shell;

Cylinder, is rotatably located in above-mentioned tank;

Damper, is located between above-mentioned shell and above-mentioned tank, for the vibration of above-mentioned tank of decaying;

Control unit, carries out variable control to the damping force of above-mentioned damper;

Above-mentioned control unit is configured to control as follows, changes the damping force of above-mentioned damper during above-mentioned drum rotating one encloses, and according to the rotation of above-mentioned cylinder, periodically repeats this variable control,

During above-mentioned drum rotating one encloses, the damping force change of above-mentioned damper, to change accordingly with the unbalance phase range of above-mentioned tank, strengthens the damping force of the above-mentioned damper of side corresponding with unbalance position.

2. tumbling-box washing machine according to claim 1, is characterized in that,

Possess the swing circle detecting unit of the swing circle for detecting above-mentioned cylinder,

The swing circle that above-mentioned control unit detects based on above-mentioned swing circle detecting unit, periodically controls above-mentioned damper.

3. tumbling-box washing machine according to claim 2, is characterized in that,

The formation of above-mentioned swing circle detecting unit comprises: motor, for rotating above-mentioned cylinder; Cogging detecting unit, for detecting the cogging of above-mentioned motor;

In the cogging cycle that above-mentioned control unit detects based on above-mentioned cogging detecting unit, above-mentioned damper is periodically controlled.

4. tumbling-box washing machine according to any one of claim 1 to 3, is characterized in that,

In the low-speed region of above-mentioned tank generation first resonance, above-mentioned control unit periodically controls above-mentioned damper, and in the high-speed region higher than above-mentioned low-speed region, above-mentioned control unit carries out the control that the damping force of above-mentioned damper is uprised relatively.