JP5077313B2 - Drum washing machine - Google Patents

Description

  The present invention is a water tank in which a rotating drum formed in a bottomed cylindrical shape is elastically supported so that the rotation axis direction is inclined horizontally or downward from the horizontal direction from the opening front side toward the back side as the bottom. The present invention relates to a drum-type washing machine installed inside and driven by a motor fixed to the back of a water tank.

  The configuration of a conventional drum-type washing machine will be described with reference to FIG. 1 showing an embodiment of the present invention.

  In the water tank 3 elastically supported by the vibration isolating damper 70 as a suspension structure in the washing machine casing 6, the rotating drum 2 in which many holes are formed rotates from the front side to the back side which is the bottom. The rotating drum 4 is arranged such that the axial direction is horizontal or inclined downward from the horizontal direction, and the rotating drum 4 comprises a water tank unit 7 that is driven to rotate by a motor 5 fixed to the back of the water tank 3. The laundry 9 can be taken in and out of the rotary drum 4 through the front opening of the water tub 3 and the front opening of the rotary drum 2 by opening a door 9 that can be opened and closed on the front side of the rotary drum 2.

  As described above, since the rotating drum is horizontal or inclined as described above, when the laundry is stored in the rotating drum and rotated, the laundry and water tend to be biased downward, and vibration is likely to occur. Become. In particular, when performing a dehydration process in which the rotating drum is rotated at a high speed to dehydrate the laundry, the laundry containing water is stored in the rotating drum after the washing or rinsing process is completed. Depending on the type, dough, or shape, there is a state where the rotating drum tends to gather at a biased position during the spin-drying process. When the laundry is biased, a large vibration is generated in the water tank that houses the rotating drum, and abnormal vibration and abnormal noise are generated in the washing machine.

  Patent Document 1 discloses a drum-type washing machine of this type, in which the rotational speed of the rotating drum is operated over a wide rotational speed range from a low speed to a high speed in a dehydration process, and at that time the laundry is moved in the front-rear direction along the rotational axis. If there is an unbalance, there may be a problem such as a large swinging of the rotating drum depending on the rotational speed, which may cause problems such as collision with the water tank and generating noise, especially on the front side along the rotation axis. If there is an unbalance, it is said that the swinging is more likely to occur than when there is an unbalance on the rear side.

  As a technique corresponding to this, in Patent Document 1, the unbalanced position of the laundry is detected based on the output signal of the vibration component in the plurality of directions output by the vibration detection means capable of detecting the vibration component in the plurality of directions of the water tank. It is designed to deal with the front imbalance abnormality.

JP 2006-311884 A

  As disclosed in Patent Document 1, since the vibration detecting means is mounted on the upper part of the water tank, the drum-type washing machine in which the water tank is also a resonance object with respect to the vibration source of the rotating drum has a considerable degree of accuracy. It is possible to detect the vibration and execute the rotation control of the rotating drum with respect to the resonance point of the water tank. However, the resonance point (referred to as product resonance point) exists not only in the water tank but also in the washing machine casing itself, and the vibration of the entire washing machine casing increases, so the product resonance point must be accurately detected and dealt with. Is important.

  The object of the present invention is to detect and estimate the vibration of the product resonance point in advance, determine whether or not to increase the rotation of the rotating drum, and provide a drum type washing machine with less vibration when passing through the product resonance point. It is to provide.

In order to achieve the above object, a drum-type washing machine according to the present invention is configured such that a rotating drum formed in a bottomed cylindrical shape has a horizontal or horizontal rotation axis direction from an opening front side toward a back side as a bottom. as a downwardly inclined from the elastic support was placed in the water tank, in a drum type washing machine which is adapted to drive a motor fixed to the back of the tub, and a control means for controlling the rotation of said motor, said Vibration detection means provided at the front of the water tank, the vibration detection means outputs signals corresponding to vibration components in the front left / right direction, front vertical direction, front / rear direction of the water tank, the control means, The rotating drum is controlled by comparing the magnitude relationship between the output signals in the front left / right direction and the front up / down direction and the output signal in the front / rear direction at a predetermined rotation speed .

  With such a configuration, the vibration at the product resonance point can be detected and estimated in advance, and the vibration when passing through the product resonance point can be accurately estimated. be able to.

  The features of the present invention can be employed alone or in combination as much as possible.

  According to the present invention, the vibration at the time of product resonance can be accurately estimated because the vibration at the product resonance point can be detected and estimated in advance. be able to.

Sectional drawing which shows the principal part structure of the drum type washing machine which concerns on Embodiment 1 of this invention. Block diagram of control circuit of the drum type washing machine An explanatory graph of unbalance determination and unbalance abnormality determination showing the rotation speed change of the rotating drum in the dehydration process Waveform diagram showing the magnitude and rotation speed of the washing machine housing of the front and the diagonal FIG. 3 is a flowchart showing a control example including abnormal response at the product resonance point during the dehydration process shown in FIG.

According to a first aspect of the present invention, a rotating drum formed in a bottomed cylindrical shape is elastically supported so that the rotation axis direction is inclined horizontally or downward from the horizontal direction from the front side to the opening side to the back side as the bottom. and was placed in the water tank, in a drum type washing machine which is adapted to drive a motor fixed to the back of the tub, and a control means for controlling the rotation of said motor, a vibration detecting means provided at a front portion of the tub wherein the vibration detection means, the left and right front direction of the tub, before the vertical direction, prior to output a signal corresponding to the vibration component in the longitudinal direction, said control means, said rotary drum at a predetermined rotational speed, prior to By comparing the output signal in the left / right direction, front / up / down direction and output signal in the front / rear direction, the vibration of the product resonance point can be detected and estimated in advance by controlling the rotating drum. When passing Since the dynamic can be inferred accurately, it is possible to respond appropriately to the abnormal vibration during product resonance.

The second invention is the first invention, the control means, the rotary drum Oite is a predetermined rotation speed, front left-front vertical, before at least the predetermined sum of the front and rear direction of the output signal when it is, the left and right front direction, by comparing the magnitude relation of the front vertical output signal and a front rear direction of the output signal, by controlling the rotating drum, detects the vibration of the product resonance point in advance Since the vibration when passing through the product resonance point can be accurately estimated, it is possible to accurately cope with the abnormal vibration at the time of product resonance.

  Hereinafter, a drum type washing machine according to an embodiment of the present invention will be described with reference to the drawings for understanding of the present invention. In addition, the following description is a specific example of this invention, Comprising: The content of description of a claim is not limited.

(Embodiment 1)
A drum type washing machine 1 according to the present embodiment shown in FIG. 1 houses a water tank unit 7 in a washing machine casing 6. The water tank unit 7 accommodates the rotating drum 2 in the water tank 3, and the rotating shaft 2a of the rotating drum 2 is supported by a bearing 68 provided on the back surface of the water tank 3, and the drum driving motor 5 is supported on the rotating shaft 2a by a bearing 68. Linked above. The rotating drum 2 is arranged together with the water tank 3 such that the direction of the rotating shaft 2a is inclined downward from the horizontal or horizontal direction from the front side to the back side to the bottom side.

  Since the water tank unit 7 is attached with heavy components such as the bearing 68 and the motor 5 on the back side thereof, the position of the center of gravity G becomes closer to the back side and becomes unstable. Therefore, the water tank unit 7 is supported by the vibration-proof damper 70 below the position of the center of gravity G and closer to the front side, and between the upper support fitting 75 fixed to the upper part of the tank 3 and the upper surface of the washing machine casing 6. The water tank unit 7 is urged toward the front side by the first coil spring 71 installed on the front side, and further between the back surface below the support height position by the vibration damping damper 70 and the back surface of the washing machine housing 6. By installing the second coil spring 72, it is corrected that the aquarium unit 7 supported by the anti-vibration damper 70 nearer to the front side than the position of the center of gravity G falls to the back side, and a support structure having a high damping effect. It is configured.

  The drum type washing machine 1 of the present embodiment is not shown in the drawing, but the drum type washing machine having a drying function provided with a blower fan for blowing warm air, a heater for generating warm air, etc. in the rotating drum 2. A control means 20 as shown in FIG. 2 is provided to control a series of operation operations including a dryer, washing, rinsing, dewatering, and drying based on an instruction input from the user and an operation state monitoring of each part. Yes.

  The control means 20 rectifies the AC power 31 by the rectifier 32, and uses the DC power smoothed by the smoothing circuit including the choke coil 33 and the smoothing capacitor 34 as the driving power to rotate the motor 5 by the inverter circuit 26. The rotation of the drum drive motor 5 is controlled based on the operation instruction input from the input setting means 21 and the monitoring information of the operation state detected by each detection means, and the water supply valve 14, the drain valve 13, and the air blow are controlled by the load drive means 37. The operation of necessary loads such as the fan 17 and the heaters 18 and 19 is controlled.

  The motor 5 includes a stator having three-phase windings 5a, 5b, and 5c and a rotor having a two-pole permanent magnet, and is configured as a DC brushless motor provided with three position detection elements 24a, 24b, and 24c. The rotation is controlled by a PWM control inverter circuit 26 constituted by the switching elements 26a to 26f. The rotor position detection signals detected by the position detection elements 24a, 24b, and 24c are input to the control means 20, and the on / off states of the switching elements 26a to 26f are PWM-controlled by the drive circuit 25 based on the rotor position detection signals. Thus, energization of the three-phase windings 5a, 5b and 5c of the stator is controlled to rotate the rotor at a required rotational speed.

  The control means 20 detects the cycle each time the signal state of any of the three position detection means 24a, 24b, 24c changes, and the rotational speed detection means 24 uses the rotational speed of the rotor as an internal function based on the period. Calculated by

  By the way, as described above, the rotating drum 2 of the water tank unit 7 elastically supported as described above has the direction of the rotating shaft 2a being horizontal or inclined, and when the laundry is stored and rotated, Since water tends to be biased downward, vibration is likely to occur, and in the dehydration process in which the laundry drum is dehydrated by rotating the rotating drum 2 at a high speed of 1000 to 1550 r / min shown in FIG. Alternatively, the laundry containing water tends to gather at a biased position of the rotary drum 2 depending on the type, fabric, or shape after the end of the rinsing process. When the laundry is biased, a large vibration is generated in the water tank 3 that accommodates the rotating drum 2, and abnormal vibration and abnormal noise are generated in the washing machine.

  In this state, as disclosed in Patent Document 1, the water tank 3 becomes a resonance object from the rotary drum 2 and is the resonance point of the water tank, which is the first resonance point near 120 r / min, near 250 r / min. When the resonance occurs at the second resonance point in the tank, further at a resonance point of 1000 r / min or more, it causes abnormal vibration of the entire water tank unit 7 and generates abnormal noise. Rotation control is performed by detecting vibration at 40, and a certain degree of response to abnormal noise can be achieved.

  However, the vibration at the product resonance point in the vicinity of 600 r / min is smaller than the output value at the resonance point of the aquarium because the output value of the vibration detection means 40 is small. Since the vibration of the product increases as it approaches the product resonance point, it must be detected before reaching the vicinity of the product resonance point.

  Therefore, in the present embodiment, the vibration detection means 40 that detects vibration components in a plurality of directions in the front left / right direction, the front up / down direction, and the front / rear direction is provided in the upper front portion of the water tank 3. For example, based on the magnitude relationship and sum of output signals of vibration components in multiple directions related to the front left / right direction, front front up / down direction, front front / rear direction at a certain momentary rotation speed before the product resonance point, The rotation control in the dehydration process as shown in FIG. 3 after the completion of the washing and rinsing process is carried out to cope with the abnormal vibration at the product resonance point.

  Thus, the vibration detection means 40 is in the upper front part of the water tank 3 and outputs signals corresponding to vibrations in a plurality of directions of the front and left and right directions, the front and up and down directions, and the front and rear direction of the water tank 3, but the product resonance Regarding the magnitude relationship between the output signals of the vibration components in the front / rear direction and the front / rear direction / front / rear direction at a predetermined rotational speed (for example, 350 r / min) before the point (near 600 r / min), When it is larger than the output signals in the other two directions, there is a feature that the vibration at the product resonance point becomes small.

  FIG. 4 shows the rotational speed in the state of front unbalance (referred to as front unbalance) in which the output signal of the vibration component in the front left / right and front / up / down directions is larger than the output signal of the vibration component in the front / rear direction, The rotational speed of the diagonal unbalance (referred to as diagonal unbalancing) in which the output signal of the vibration component in the front / up / down direction is smaller than the output signal of the vibration component in the front / rear direction, and the upper part of the side surface of the washing machine casing 6 This represents the relationship with the vibration.

  According to such a method, the output signal of the vibration component in the front-rear direction output from the vibration detection means 40 at a predetermined rotational speed (for example, 350 r / min) before reaching the product resonance point (around 600 r / min). Is used to predict the vibration state of the product resonance point near 600 r / min, and the output signal of the vibration component in the front / rear direction is the other two. When the output signal is smaller than the direction output signal, it is determined that the vibration at the product resonance point is increased, and the rotary drum 2 is stopped and restarted.

  On the other hand, when the output signal of the vibration component in the front / rear direction is larger than the output signals in the other two directions, it is determined that the vibration at the product resonance point is small, and the rotation speed of the rotary drum 2 is continuously increased. In this way, it is provided for dealing with abnormal vibration at the product resonance point.

  Even if the output signal of the vibration component in the front left / right and front / up / down directions is larger than the output signal of the vibration component in the front / rear direction, if the sum of the output signals in the three directions is extremely small, there is an abnormality at the product resonance point. Since vibration does not occur, it goes without saying that the accuracy is further improved if the condition that the sum of the output signals in the three directions exceeds a predetermined value is added.

  Here, as an example, the first predetermined rotation speed before reaching the product resonance point is 330 to 400 r / min, and output signals of vibration components in the front / rear direction, front / rear direction, and front / rear direction Calculate the sum of. If the sum is greater than a certain value, compare the magnitude relationship between the output signal of the vibration component in the front / rear direction and the output signal of the vibration component in the front / left / right direction and the front / rear direction. When the output signal is smaller than the output signals in the other two directions, it is determined that the vibration at the product resonance point is increased, and the rotary drum 2 is stopped and restarted.

  If the output signal of the vibration component in the front / rear direction is larger than the output signals in the other two directions, it is determined that the vibration at the product resonance point is reduced, and the rotation speed of the rotary drum 2 is continuously increased. In this way, it is provided for dealing with abnormal vibration at the product resonance point.

  In this way, the abnormal vibration at the product resonance point is estimated and used for dealing with the abnormal vibration at the product resonance point.

  Here, an abnormal vibration at the product resonance point is determined while the rotation of the rotary drum 2 is increased, and when there is an abnormal vibration, an example of performing dehydration control corresponding to the abnormal vibration is described with reference to the flowchart shown in FIG. This will be specifically described.

  When the dehydration process starts in step 100, a draining operation for draining the washing water in the water tank 3 is performed in step 101. Thereafter, in order to loosen clothes such as clothes that are biased in step 102, the rotating drum 2 is rotated forward at a second predetermined rotation speed (for example, about 40 r / min), and a reverse operation (unraveling step) is performed.

  Next, in step 103, the laundry is gradually raised to a third predetermined rotational speed (about 70 r / min) to such an extent that the laundry sticks to the inner surface of the rotary drum 2. Thereafter, the rotational speed of the rotary drum 2 is further increased, and control is performed in step 104 to maintain the rotary drum 2 at a fourth predetermined rotational speed (for example, about 80 rpm) lower than the primary resonance rotational speed for a predetermined time. At this time, the rotation unevenness, that is, the presence / absence of initial imbalance, is detected. However, it is only necessary to detect and cope with an imbalance more than the extent that causes an imbalance abnormality in the subsequent high speed operation. It is sufficient to determine the unbalanced state on behalf of the front left / right unbalance, which also reflects. The determination can also be made by not outputting signals from the detected rotational speed detecting means (position detecting means 24a, 24b, 24c) at a predetermined interval.

  Here, if there is an unbalance greater than or equal to a predetermined value, it is determined that the rotation unevenness is large and the balance state is poor, and it is determined in step 105 whether or not N = 4. If N = 4 is not satisfied, the rotating drum 2 is temporarily stopped in the next step 106, and 1 is added to N at the present time in step 107 and the process returns to step 102. If the operation from step 102 to 107 is repeated a predetermined number of times, that is, if N = 4 in step 105, it can be assumed that the bias of the selection will not be eliminated by repeating the solving process in step 102. Give up and move on to the next process. If there is no rotation unevenness, the process proceeds to the next step 108 as it is.

  In step 108, the rotational speed is increased, and an imbalance abnormality at 81 to 329 r / min is determined by the output signal from the vibration detection means 40. If there is an imbalance abnormality, the process returns to step 106, and if no imbalance abnormality has occurred, the process proceeds to step 109.

  Further, in step 109, the sum of the output signals of the vibration components in the front / rear direction, the front left / right direction, and the front / up / down direction and the vibration component of the front / rear direction in the first predetermined rotation speed range of 330 to 400 r / min. Abnormal vibration at the product resonance point (around 600 r / min) is determined using the magnitude relationship between the output signal and the output signal of the vibration component in each of the front left / right direction and front / up / down direction. If it is determined that the product resonance point is abnormal vibration, the process returns to step 106, and if it is determined that the vibration is normal, the process proceeds to step 110.

  When the cloth bias correction operation in step 102 is performed by forward / reverse arc rotation of the rotating drum 2, the rotational speed of the rotating drum 2 is set to 40 rpm or more so that the rotating drum can be rotated during sudden braking to reverse the normal / reverse direction. Since a strong inertial force is applied to the laundry attached to 2 and peeled off from the rotating drum 2, the laundry is dropped in a direction opposite to the left and right sides, so that the laundry can be effectively peeled off. Also, the peeled laundry can be loosened while being switched left and right by the subsequent forward and reverse arc rotation, and can be distributed evenly in the front and rear and left and right within the rotating drum 2. Such a left-right interchange of the laundry requires that the laundry be lifted higher, and therefore, it is preferable to perform forward and reverse arc rotation of the rotary drum 2 at an angle of, for example, more than 90 ° and less than 180 °.

  On the other hand, in the drum-type washing machine 1 according to the present embodiment, the support position Q and the center of gravity G by the anti-vibration damper 70 as seen in the direction of the rotating shaft 2a with respect to the central position S of the water tank 3 in the direction of the rotating shaft 2a. Both are located on the rear side, and the distance L1 between the center position S and the support position Q is greater than the distance L2 between the center position S and the center of gravity G, and the support position Q is not behind the center of gravity G when viewed in the direction of gravity. In any case, because of the relationship located near the front, the flourwood movement of the aquarium unit 7 greatly affects the front compared to the rear of the aquarium 3, regardless of whether the front or rear imbalance is present. As a result, in addition to the vibration components in the left and right, front and rear, and up and down directions of the front portion of the water tank 3, the vibration components in the rear left and right and rear and up and down are synthesized with high correlation.

  By utilizing these correlations, it is possible to execute simple control to cope with an unbalance abnormality corresponding to the necessary unbalance of each vibration component including the rear unbalance, using only the previous vibration information.

  It is practically used for dehydration in a drum-type washing machine with a rotating drum installed horizontally or inclined, and abnormal vibration at the product resonance point is performed quickly and accurately while the rotation speed of the rotating drum before the product resonance point is increased. Since it can respond accurately to vibrations, it is useful for drum-type washing machines and the like.

DESCRIPTION OF SYMBOLS 1 Drum type washing machine 2 Rotating drum 2a Rotating shaft 3 Water tank 5 Motor 6 Washing machine housing 7 Water tank unit 9 Door 20 Control means 24 Rotational speed detection means 30 Cloth amount detection means 40 Vibration detection means 70 Vibration damping damper

Claims (2)

A rotating drum formed in a cylindrical shape with a bottom is installed in a water tank that is elastically supported so that the axis of rotation is inclined horizontally or horizontally downward from the opening front side to the bottom side. in the drum type washing machine which is adapted to drive a motor fixed to the back of the tub, and a control means for controlling the rotation of said motor, and a vibration detecting means provided at a front portion of the tub, the vibration detection The means outputs signals corresponding to vibration components in the front left / right direction, front front / rear direction, and front / rear direction of the water tank, and the control means is a front / rear direction / front / rear direction at a predetermined rotational speed of the rotating drum. The drum type washing machine is characterized in that the rotary drum is controlled by comparing the magnitude relationship between the output signal of the front and the output signals in the front and rear direction . Said control means, said Oite rotary drum at a predetermined rotation speed, front left and right directions, when before the vertical direction, the sum of the previous front and rear direction of the output signal is equal to or greater than the predetermined value, the left and right front direction, before the vertical direction output signals before comparing the magnitude of the longitudinal direction of the output signal of the drum-type washing machine as claimed in claim 1, characterized in that to control the rotary drum.

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