JP2014079487A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of grasping a bias situation of laundry during a rotation at a resonance rotation speed or below and adjusting a rotation control device in accordance with the situation to suppress a vibration when the rotation speed passes the resonance rotation speed, and solve the problem that it is not able to start up dewatering since a displacement by vibration is large due to a bias of laundry in a rotary tub when the rotation speed of the rotary tub of the machine body passes a resonance speed at a start-up of dewatering of the washing machine.SOLUTION: There is provided a drum type washing machine capable of minimizing a vibration when the rotation speed of a rotary tub passes a resonance rotation speed by detecting the displacement of optional two axes of a vibration detection part 10 provided at a front upper part of a washing tub 22 in a state where the rotary tub is rotated at a rotation speed lower than the resonance rotation speed, and precisely grasping the amount of bias and the bias position (in front and back directions) of laundry 18 from the amount of the displacement value and driving the rotation control device 10 (ball balancer) with an optimal condition at a start-up of dewatering.

Description

  The present invention accurately grasps the unbalanced state due to the laundry clothes and the like being biased in the drum when shifting from the washing process to the dewatering process of the drum type washing machine equipped with the rotating body control device (ball balancer), The present invention relates to a drum type washing machine that suppresses vibrations at the time of start-up by shifting to a dehydration process by a start-up method according to the grasped state.

  Conventionally, in this type of drum-type washing machine, clothes in the drum are unevenly distributed in a state where wet clothes are accommodated in the drum. For this reason, when it rotates at high speed around the horizontal axis, it becomes in an unbalanced state, has a maximum resonance point from about 200 to 400 r / min after startup, and generates power consumption loss due to vibration, noise and vibration. Therefore, high-speed rotation cannot be easily performed.

  For this purpose, a rotating body control device (ball balancer) is provided, and when the rotational speed of the drum is higher than the natural frequency of the drum, the ball in the ball balancer moves to a position opposite to the clothing bias. By utilizing this action, the ball balancer ball moves in the opposite direction to the bias of the clothes in the drum, thereby eliminating the unbalanced state.

  However, when moving the ball in the ball balancer, if the drum rotates at a low speed, the drum does not move upward due to gravity at the bottom of the ball balancer. In addition, when the rotational speed of the drum becomes a constant rotational speed at which rotational acceleration exceeding the gravity of the ball is applied, the ball moves upward. By controlling this operation, vibration can be suppressed depending on where the ball is arranged with respect to the bias of the clothing.

  However, unless it is possible to grasp how the laundry clothes and the like are biased in the drum, the position of the ball cannot be set to the optimum position according to the bias. In order to grasp the bias of the clothing, a method for grasping the bias of the clothing by the vibration displacement of the vibration detecting means provided in the washing tub is shown (for example, see Patent Document 1).

  As an example of a conventional drum type washing machine, the washing machine described in Patent Document 1 will be described with reference to FIGS. FIG. 8 shows a configuration diagram of a conventional drum-type washing machine. FIG. 9 shows a control block diagram of a conventional drum-type washing machine.

  As shown in FIG. 8, a washing tub 20A fixed to the washing machine main body 10A is provided. The washing tub 20A houses the drum 30A, and a motor 40A that drives the drum 30A is located on the back of the washing tub 20A. On the front surface of the drum 30A, a door 70A provided at a clothes insertion port is disposed, and the washing tub 20A is supported by a damper 220 from the bottom of the main body, and is supported by suspension springs 180 and 190 disposed at the top of the main body. A vibration detection means 50A for detecting the vibration of the washing tub 20A is provided on the bottom of the rear portion of the washing tub 20A, and a control device 60A for driving the drum 30A based on the detection signal is provided.

  As shown in FIG. 9, the control block inside the control device 60 </ b> A takes the signal from the vibration detection means 50 </ b> A that detects the vibration of the washing tub 20 </ b> A by the filter circuit 502 and calculates only the signal component and calculates it by the microcomputer 60. Is provided with an unbalance position detecting means 5-9 for calculating the unbalance amount and an unbalance amount detecting means 508 for calculating the unbalance amount, and controls the motor control circuit 504 according to the vibration of the vibration detecting means 50A to drive the motor 40A. Thus, the drum 30A is rotationally controlled.

  In the conventional drum-type washing machine, the vibration of the vibration detecting means 5 is detected in a state where the rotation speed of the drum 3 is maintained at 300 rpm, and the ratio of the signal values in the three axial directions of the detection signal is obtained. The unbalance position detection means 59 identifies the unbalance position from the rank, and the unbalance amount detection means 58 calculates the unbalance amount from the unbalance amount for each unbalance position.

JP 2011-030972 A

  However, in the conventional configuration, the vibration detection means 5 for detecting the unbalance position and amount due to the bias of the laundry in the drum 3 is performed while maintaining the rotation speed of the drum 3 at 300 rpm. Since the resonance rotational speed of the washing machine is at a drum rotational speed of about 120 to 400 rpm, detection is performed at the resonance point when the dehydration process is started.

  Therefore, the vibration at the resonance point is large, and it may not be possible to start, so the unbalance amount and unbalance position may not be specified. Therefore, although detection is possible under conditions where the vibration displacement at the resonance point at the time of activation is below a certain level, there is a problem that it is not possible to detect whether the dehydration process can be activated. For this reason, the dehydration process is repeated while increasing the number of rotations to 300 rpm, and the dehydration process is repeated again.

  Further, it is necessary to calculate the signal from the vibration detecting means 5 from the ratio of the three-axis signals and their ranks, the error factor becomes large, and complicated calculation is required.

  The present invention solves the above-mentioned conventional problems, and specifies an unbalance amount and an unbalance position before the resonance rotational speed, and by performing the specification, a ball in a ball balancer that is a rotating body control device is activated at the time of activation. An object of the present invention is to provide a drum-type washing machine that can suppress vibrations of the drum by controlling, smoothly start up, and prevent the dehydration process from being repeated.

  In order to solve the conventional problems, a drum-type washing machine according to the present invention includes a housing, a laundry tub elastically supported in the housing, and a rotatable tub stored in the laundry tub. A drive unit that rotationally drives the rotary tub, a ball balancer provided on a circumference of the rotary tub, a vibration detection unit provided in the washing tub, and the drive unit based on an output from the vibration detection unit A drum-type washing machine including a control unit that controls the clothes, and the control unit is configured to apply clothing from any two-axis output of the vibration detection unit in a state where the rotating tub is maintained at a predetermined number of rotations equal to or less than a resonance number of rotations. An unbalance determining unit that calculates an unbalance amount that is a bias amount and an unbalance position that is a bias position of clothing.

  As a result, when the rotational speed of the rotating tank is accelerated from the biaxial vibration value, the unbalance position and the unbalance amount in the rotating tank can be grasped, and the rotation control device is controlled according to the situation. Thus, it is possible to suppress the occurrence of vibrations in the rotating tank.

  Accurately grasp the unbalance position and unbalance amount of the laundry in the drum before the resonance point rotation speed, and control the rotation control device according to the amount and position to suppress the vibration of the washing tub and further dewatering It is possible to prevent a stable operation at the time of start-up and repeated start-up of the start-up.

  Furthermore, it is possible to grasp the unbalance amount and unbalance position of the laundry only with any two-axis output of the multi-axis vibration detection unit, simplify the detection method for performing the control, and improve the responsiveness easily. be able to.

Configuration diagram of drum-type washing machine in Embodiment 1 of the present invention Control block diagram of the drum type washing machine (A) The figure which shows the unbalanced state on the circumference of the rotation tank of the laundry of the drum type washing machine (b) The figure which shows the front unbalanced state in the depth direction of the rotation tank (c) The depth of the rotation tank The figure which shows the back side unbalanced state in a direction (d) The figure which shows the middle side unbalanced state in the depth direction of the rotation tank (e) The figure which shows the diagonal unbalanced state in the depth direction of the rotation tank Characteristics of motor current and circumferential unbalanced position Characteristic diagram of unbalance amount and signal of vibration detector of the drum type washing machine Characteristics diagram of unbalanced position and signal of vibration detector of the drum type washing machine (A) Comparison diagram of vibration displacement output of vibration detection unit of fluid balancer of drum type washing machine (b) Comparison diagram of vibration displacement output of vibration detection unit of ball balancer of drum type washing machine Configuration diagram of a conventional drum-type washing machine Control block diagram of a conventional drum type washing machine

  A drum-type washing machine according to a first aspect of the present invention is a housing, a laundry tub elastically supported in the housing, a rotatable tub accommodated in the laundry tub, and a rotary tub that rotates. A driving unit; a ball balancer provided on a circumference of the rotating tub; a vibration detecting unit provided in the washing tub; and a control unit that controls the driving unit based on an output from the vibration detecting unit. In the drum-type washing machine, the control unit maintains an unbalance amount that is a bias amount of clothing from any two-axis output of the vibration detection unit in a state where the rotating tub is maintained at a predetermined number of rotations equal to or less than a resonance number of rotations. And an unbalance determination unit that calculates an unbalance position that is a biased position of clothing.

  With such a configuration, the rotation speed of the rotating tank is maintained at a predetermined rotation speed that is equal to or less than the resonance rotation speed, and the unbalance determination unit calculates the unbalance amount based on an arbitrary uniaxial output displacement value of the vibration detection unit. Then, by calculating the unbalance position based on another arbitrary uniaxial output displacement value according to the calculated unbalance amount, it is possible to accurately grasp the laundry bias in the rotating tub accurately. By controlling the ball position of the rotating body control device (ball balancer) according to the situation, it is possible to suppress the vibration of the washing tub when passing through the resonance rotational speed.

  According to a second aspect of the present invention, the unbalance determining unit according to the first aspect of the present invention unbalances the rotational speed of the rotating tub within a range equal to or lower than the resonance rotational speed and above the minimum rotational speed at which clothing in the rotating tank sticks to the inner wall of the rotating tub. The balance amount and the unbalance position are determined. Thus, by changing the number of rotations of the rotating tub while maintaining the state where the laundry is stuck in the rotating tub, the rotation tub can be controlled to the number of rotations detected by the vibration detection unit with higher accuracy. It is possible to grasp the unbalance amount and the unbalance position with higher accuracy.

  In a third aspect of the invention, the unbalance determination unit of the first or second aspect of the invention calculates an unbalance amount and an unbalance position from the biaxial outputs of the left and right vibrations and the longitudinal vibrations of the vibration detection unit. As a result, the unbalance amount can be calculated from the lateral vibration displacement of the washing tub, and the unbalance position can be accurately grasped by the longitudinal vibration displacement according to the calculated unbalance amount.

  4th invention provides the said vibration detection part of any one of 1st-3rd invention in the front upper part of the said washing tub. Thereby, it is possible to easily detect vibration by providing a vibration detection unit at a position farthest from the rotation tank axis, and it is possible to grasp the unbalance amount by the left and right vibration displacement in front of the rotation tank, Furthermore, according to the unbalance amount, the unbalance position can be accurately grasped by the longitudinal vibration displacement in front of the upper part of the rotating tub, and more accurate unbalance determination can be performed.

  Embodiment 1 of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a drum-type washing machine according to Embodiment 1 of the present invention. FIG. 2 is a control block diagram of the drum type washing machine in the first embodiment of the present invention.

  FIG. 3D is a perspective view as seen from the side of the drum 3 and is a middle unbalance position diagram in which the unbalance position A is on the drum inner side. FIG. 3E is a perspective view as seen from the side of the drum 3, and is a diagonal unbalance position diagram in which the unbalance position A is diagonal to the drum.

  In FIG. 1, the washing machine main body (housing) 1 includes a drum 3 for storing laundry 18, a washing tub 22 for storing the drum 3 therein, and a damper 19 for supporting the washing tub 22. The inner peripheral wall of the drum 3 is provided with baffles 7 (three in this case) for lifting and stirring the laundry 18 when the drum 3 rotates. A ball balancer 8 that is a rotation control device that encloses a plurality of balls 9 (for example, iron balls) and oil of a predetermined viscosity is provided on the laundry input port side on the front side of the drum 3. The ball balancer 8 rotates together with the drum 3, and the balls 9 arranged in a line in the ball balancer 8 are configured to be freely movable in the rotation direction due to the oil viscosity inside.

  Further, a vibration detecting means (multi-axis vibration sensor) 10 is provided at the upper front side of the washing tub 22 to grasp the vibration of the left / right displacement, the front / rear displacement and the vertical displacement of the upper portion of the front side (front side) of the washing tub 22. The control unit 13 performs control such as increasing, stopping, or maintaining the number of rotations of the drum 3 depending on the magnitude of the displacement.

  A drum pulley 4 provided on the same axis as the drum 3 is provided on the back side of the drum 3. The drum 3 is rotated by transmitting the drive of the motor 12 to the drum pulley 4 via the belt 6.

  The motor 12 is provided with a rotor position detector 15 that detects the rotor position of the motor 12. The rotor position detection unit 15 detects the rotor position, and the control unit 13 performs control to drive the motor 12. Since the motor 12 is a permanent magnet synchronous motor, the rotor position of the motor 12 is determined by the rotor position detector 15 and input to the controller 13 so that the motor 12 rotates without being stepped out.

  In FIG. 2, the control unit 13 that performs drive control of the washing machine main body (housing) 1 includes a determination unit 131 and a rotation control unit 132. The determination unit 131 includes a current detection unit 101 that detects a current flowing through the motor 12, and a rotational position detection unit 103 that detects an unbalanced position in the circumferential direction in the drum 3 due to the bias of the laundry 18, The unbalance amount calculating means 31 for detecting the unbalance amount of the laundry 18 in the drum 3 from the lateral displacement of the vibration detecting means (multi-axis vibration sensor) 10, and the unbalance amount calculated by the unbalance amount calculating means 31. Accordingly, the unbalance position calculation means 30 for calculating the unbalance position of the laundry 18 in the depth direction of the drum 3 from the longitudinal displacement of the vibration detection means (multi-axis vibration sensor) 10 and the capacity of the laundry 18 in the drum 3 are calculated. It is comprised from the clothing amount determination part 102 to detect.

  The rotation control unit 132 includes a drive unit 133 that drives the motor 12 therein, and the drive unit 133 drives the motor 12 in synchronization with the rotor position signal of the rotor position detection unit 15 that detects the rotor position of the motor 12. To do. The motor 12 rotates the drum 3 via the drum pulley 4 and the belt 6 as a speed reduction mechanism, and a vibration detecting means is provided at the upper part on the front side (front side) of the washing tub 22 so that the washing tub 22 vibrates by the rotation. (Multi-axis vibration sensor) 10 detects the displacement.

  Next, FIG. 3A is a front view showing a front side view of the drum 3 where the unbalanced position A is generated with the laundry 18 stuck to the inner wall of the drum 3. FIG. 3B is a perspective view as seen from the side of the drum 3, and is a front unbalance position diagram in which the unbalance position A is on the front side (front side). FIG. 3C is a perspective view seen from the side of the drum 3 and is a rear unbalance position diagram in which the unbalance position A is on the rear side. FIG. 4 is a current characteristic diagram of the motor in a state where the drum type washing machine is unbalanced. FIG. 5 is an unbalance amount characteristic diagram showing the relationship between the left-right displacement of the multi-axis vibration sensor provided on the upper front side of the washing tub and the unbalance amount. FIG. 6 is an unbalance position characteristic diagram showing the longitudinal vibration displacement and the unbalance position for each unbalance amount. FIG. 7A is a left-right displacement diagram of the fluid balancer showing the left-right vibration displacement when the drum-type washing machine provided with the conventional fluid balancer is rotated at 120 rpm. FIG. 7B is a left-right displacement diagram of the ball balancer showing left-right vibration displacement when the drum-type washing machine equipped with the ball balancer of the present invention is rotated at 120 rpm.

  3 (a) and 4 (a), FIG. 3 (a) shows that the unbalanced position A when viewed from the front side of the drum 3 rotates on the circumference of the drum 3 and is provided on the outer periphery of the drum 3. 3 shows a state in which the ball 9 of the rotation control device (ball balancer 8) is biased toward the bottom, and the minimum rotation speed at which the laundry 18 sticks to the inner wall of the drum 3 (the gravity applied to the laundry and the centrifugal force of the drum 3) The rotation speed at which the force is balanced (for example, about 60 to 70 rpm) or more, and the oil having a predetermined viscosity in the ball balancer 8 causes the ball 9 to be biased to the bottom and does not rotate with the drum 3 (for example, In the case of about 80 rpm, it changes depending on the viscosity of the oil, but here, it shows that the ball is in the following state when the rotation speed is 80 rpm or more and the drum 3 rotates asynchronously with the rotation of the drum 3.

  Accordingly, in this state, the laundry 18 in the drum 3 rotates, and only the unbalance position A is detected as a change in motor current by the current detection unit 101 as an unbalance. When the current change is detected in the state shown in FIG. 4 and the unbalanced position A of the laundry 18 moves from the bottom to the top of the drum 3, the motor current value is defined as the minimum current value b to the maximum current value a. It is detected. The repetition period is detected while the drum 3 is driven at the same rotation speed.

  3 (b) to 3 (e), the unbalance position is generated in a complicated manner depending on the actual position of the laundry 18, but it can be grasped by the following four classifications. FIG. 3B shows the case where the unbalance position A in the depth direction of the drum 3 is in front of the drum 3, and FIG. 3C shows that it is on the rear side. Further, FIG. 3D shows that the drum 3 is at an intermediate position, and FIG. 3E shows that the unbalance position A is located at a diagonal position (180 degrees) on the front side and the rear side of the drum 3. Show.

  In FIG. 5, the left-right vibration displacement of the vibration detecting means (multi-axis vibration sensor) 10 provided in the upper front part of the washing tub 22 is the rotational speed 120 rpm at which the ball 9 of the ball balancer 8 rotates without being fixed to the bottom. (For example, between 90 and 150 rpm), the unbalance position A depends on the unbalance amount regardless of the positional relationship shown in FIGS. Accordingly, there is a characteristic that becomes a relationship diagram with the unbalance amount shown in FIG. The rotation axis of the drum 3 is fixed with the back side of the washing tub 22 as an axis, and the vibration detection means (multi-axis vibration sensor) 10 is provided in the upper part of the front side at a distance, so that the depth direction of the drum 3 The unbalanced position is affected by the longitudinal displacement and the vertical displacement, but the lateral displacement has little effect and is almost unaffected by the unbalanced position in the depth direction, so the relationship between the unbalanced amount and the lateral displacement can be obtained. .

  6 according to the unbalance amount detected in accordance with the vibration displacement from the relationship between the left-right displacement and the unbalance amount shown in FIG. 5, and in the depth direction of the drum 3 from the inclination in each unbalance amount in FIG. There is a characteristic indicating an unbalance position for each unbalance amount and a longitudinal vibration displacement capable of calculating an unbalance position at. The front-rear displacement of the vibration detection means (multi-axis vibration sensor) 10 provided at the front upper part of the washing tub 22 is a rotation speed of 120 rpm (for example, 90 rpm) in which the ball 9 of the ball balancer 8 rotates without being fixed to the bottom. And 150 rpm), it can be detected as longitudinal vibration by the unbalance position in the depth direction of the drum 3 for each unbalance amount. This is because the axis of the drum 3 is the rear part of the washing tub 22, and the vibration detecting means (multi-axis vibration sensor) 10 is provided at the position of the front upper part away from the axis, so that the drum is subjected to the longitudinal vibration displacement. It is shown that the characteristic indicating the depth direction unbalance position of 3 appears from the experimental results.

  In FIG. 7A, when a fluid balancer (liquid is enclosed in the balancer) provided on the front circumference of the drum 3 as a conventional balancer function, vibration detection means (provided at the upper front of the washing tub 22) The left and right vibration displacement of the multi-axis vibration sensor 10 is such that the liquid in the fluid balancer always moves in a diffused or biased manner when the drum 3 is maintained at a rotation speed of 120 rpm (for example, between 90 and 150 rpm). Therefore, the left-right displacement is not constant because the rotation is asynchronous with the rotation of the drum 3 and the deviation is not constant, indicating that the displacement has changed, and that the vibration displacement is not always in the same state. Therefore, it is difficult to calculate the true left-right vibration displacement.

  In FIG. 7B, in the case of the drum 3 on which the ball balancer 8 shown in the first embodiment is mounted, the left-right vibration displacement of the vibration detection means (multi-axis vibration sensor) 10 provided in the upper front portion of the washing tub 22 is When the drum 3 is maintained at a rotational speed of 120 rpm (for example, between 90 and 150 rpm), the ball 9 in the ball balancer 8 is biased to a substantially constant position by oil having a predetermined viscosity. This shows that the left and right vibration displacement fluctuates in accordance with the rotation period of the drum 3 within a certain amplitude range because the drum 3 rotates at a rotation speed delayed by a constant rotation speed from the rotation speed of the drum 3. Therefore, since the drum rotation speed and the ball rotation speed are rotated with a certain rotational speed deviation, the left and right vibration displacement causes the unbalanced position A of the laundry 18 and the bias of the ball 9 to cancel each other or overlap each other at a constant cycle. By repeating, this fluctuation cycle and amplitude fluctuation occur. Therefore, the left / right variation value can be easily calculated from this cycle and the variation range.

  The calculation method is a method in which the amount of displacement of the ball 9 is offset by the difference between the maximum left and right displacements or the minimum displacement, or a method in which the true value of the lateral displacement is calculated by calculating the average of the lateral displacements during the 120 rpm period. There may be.

  Although the left and right vibration displacement by the fluid balancer is shown in FIG. 7 (a), it is not always fixed how the liquid that actually becomes a fluid always operates with respect to the rotation of the drum 3; It does not become like a), and the fluctuation range and the degree of change cannot be determined. Therefore, it is difficult to calculate the actual size of the left / right displacement.

  Here, the vibration detecting means (multi-axis vibration sensor) 10 is a sensor that detects vibration displacement that can detect vibration in X (front-rear direction) Y (left-right direction) Z (vertical direction), but X (front-rear direction) Y It may be an acceleration sensor that can detect the acceleration in the (left-right direction) Z (vertical direction), and the same applies even if the displacement is calculated from the acceleration. Moreover, it is also possible to detect with the same sensor which can detect the vibration of X (front-back direction) Y (left-right direction) Z (up-down direction).

  About the drum type washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the washing machine body (housing) 1 operates the drum 3 before the washing process, and the clothes amount determination unit 102 determines the amount of laundry accommodated in the drum 3. Thus, the washing time and the amount of detergent are calculated and used for grasping the unbalanced state before the dehydration process.

  Next, after the washing process and the rinsing process are finished, when the washing water in the washing tub 22 is drained and then dewatered, the state of the laundry 18 is located in the drum 3 in a uniform state. Is almost rare, and most of them generate an unbalanced state.

  Therefore, in general, in order to eliminate the unbalanced state, the drum 3 is rotated slowly after draining, and the laundry 18 is loosened to perform the operation of eliminating the unbalanced state as much as possible. However, even in this state, the unbalanced state remains, and in this state, the dehydration process is started.

  First, during the dehydration process, when the washing tub 22 of the washing machine main body (housing) 1 passes through the resonance speed of the drum 3 (for example, between 220 and 400 rpm here), the vibration is stipulated by a large vibration. When the displacement is exceeded, the rotation of the drum 3 is stopped. After the stop, the loosening process is performed again and dehydration is started again. However, vibration detection means (multiple vibrations) provided at the front upper part of the drum 3 at a rotational speed lower than the resonant rotational speed of the drum 3 so that the dehydration start is successful by suppressing vibration as much as possible at the resonant rotational speed of the drum 3. The unbalanced amount and unbalanced position of the laundry 18 are detected by the vibration displacement of the axial vibration sensor 10, and the rotational speed control device (ball balancer) 8 is controlled from that state, and the resonant rotational speed is passed in that state. Therefore, vibration can be suppressed. The operation will be described below.

  In the dehydration process, the drive unit 133 causes the motor 12 to apply a drive voltage according to a command from the rotation control unit 132 of the control unit 13. Thereby, the motor 12 is gradually operated from the low speed rotation to the high speed rotation, and the rotation speed of the drum 3 is gradually increased.

  Next, the rotation control unit 132 controls the motor 12 so that the number of rotations of the drum 3 is about 120 rpm, and maintains that state. In this state, left and right displacements and longitudinal displacements are detected from vibration detection means (multi-axis vibration sensor) 10 provided at the upper front of the drum 3. Here, since the state is equal to or lower than the resonance rotational speed, stable vibration displacement is detected. However, the ball 9 inside the ball balancer 8 rotates in a state where it deviates from the rotation speed of the drum 3 and deviates from the constant rotation speed while being biased to one place due to oil viscosity. As a result, a lateral vibration displacement (characteristic diagram H2) having a constant period and a constant fluctuation value as shown in FIG. 7B is detected. As a result, a new lateral displacement value can be easily calculated. However, in the case of a conventional fluid balancer, as shown in FIG. 7A, the left and right vibration displacement does not always rotate in a state where the fluid in the fluid balancer is constantly rotated with the rotation of the drum 3, By changing the biased state, the vibration displacement caused by the unbalanced position A caused by the laundry 18 and the vibration displacement caused by the fluid state are overlapped, and the state is always changed. Therefore, the left-right vibration displacement cannot be easily calculated.

  Next, the left and right vibration displacement detected by the vibration detecting means (multi-axis vibration sensor) 10 is input to the unbalance amount calculating means 31, and the left and right vibration displacement can be easily obtained by obtaining the average value of the period maintained at 120 rpm. The true value of can be calculated. From the true lateral displacement value, the unbalance amount is calculated from the characteristic diagram of the lateral displacement and the unbalance amount shown in FIG. 5 (relationship diagram S1 obtained from the experimental values). For example, when the true value of the lateral displacement is 1.0 mm, the unbalance amount at that time is 500 g, and when the lateral displacement is 10 mm, the unbalance amount can be calculated as 1000 g.

  However, here, the unbalance amount is generated even when the unbalance position A of the laundry 18 is in the unbalanced state before, after, inside, and diagonally as shown in FIGS. 3B to 3E. Regardless of the unbalanced amount, if the unbalance amount is the same, the experimental results have shown that the left-right displacement is the same, and the relationship between the left-right displacement and the unbalanced amount maintains the relationship shown in FIG. Therefore, the unbalance amount calculation means 31 can easily calculate the unbalance amount from the left-right displacement value.

  Next, when the drum 3 is kept rotating at the same 120 rpm, the vibration detection means (multi-axis vibration sensor) 10 detects the longitudinal displacement and the vertical displacement in addition to the lateral displacement of the upper front portion of the washing tub 22, By inputting the longitudinal vibration displacement to the unbalance position calculating means 30, the unbalance position calculating means is provided for each unbalance amount shown in FIG. 6 according to the unbalance amount calculated by the unbalance amount calculating means 31. The unbalance position can be calculated from the characteristic diagram of the longitudinal vibration displacement and the unbalance position.

  For example, when the unbalance amount calculation unit 31 calculates the unbalance amount 500 g, the unbalance position calculation unit 30 selects the characteristic Z4 from the characteristic diagram shown in FIG. The unbalance position shown on the horizontal axis is specified depending on where it is located. As a result, an unbalance position is calculated. Here, it is possible to calculate that the unbalance position is located between the front and the middle by detecting that the forward / backward displacement is 1.0 mm when the unbalance amount is 500 g.

  In this way, the unbalanced state of the laundry 18 is specified at a rotational speed lower than the resonant rotational speed of the drum 3 (here, about 120 rpm) by the unbalance amount calculating means 31 and the unbalance position calculating means 30. be able to.

  The characteristic diagrams of the lateral and longitudinal vibration displacement, the unbalance amount, and the unbalance position shown in FIGS. 5 and 6 are diagrams showing the relationship when the drum 3 is rotated at about 120 rpm. It is the obtained characteristic. Accordingly, since the characteristics change when the number of revolutions of the drum 3 is changed, the temperature change, the size and diameter of the drum 3, and the method for supporting the washing tub 22 in the machine body 1 are also taken into consideration by considering the characteristics at the number of revolutions. Even if it changes, it can be easily handled.

  Next, by controlling the ball 9 in the ball balancer 8 by detecting the unbalanced state, it is possible to minimize the vibration at the resonance point rotational speed by passing the resonant rotational speed in an optimal state. it can. Details are described below.

  The state of the laundry 18 in the drum 3 is grasped by detecting the unbalance amount and the unbalance position at about 120 rpm. Thereafter, the drum 3 is operated at a rotational speed lower than the rotational speed at which the vibration displacement is detected by the vibration detecting means (multi-axis vibration sensor) 10, and the ball 9 in the ball balancer 8 is at the bottom with respect to the rotation of the drum 3. The ball 9 is operated at a rotation speed in a state where the ball 9 does not rotate. (This is the rotational speed at which the drum 3 rotates under the condition that the gravity of the ball is larger than the centrifugal force due to the rotation, and the oil viscosity inside the ball balancer 8 is also affected. ing).

  The rotational speed at this time is changed by the oil viscosity in the ball balancer 8, and when the influence of the ambient temperature is assumed, a method of detecting the temperature and varying the rotational speed is also possible. At this time, whether the ball 9 rotates or is biased at the bottom, when rotating as shown in FIG. 7B, the vibration detecting means (multi-axis vibration sensor) with a constant period and a constant fluctuation value. ) It can be detected with 10 left and right vibration displacement. When the ball 9 is biased toward the bottom, it can be easily determined by confirming that the lateral vibration displacement does not periodically change and is stable at a constant value.

  When the drum 9 is in the position of the ball 9 as shown in FIG. 3A where the ball 9 does not rotate at a rotational speed lower than about 120 rpm, the motor 12 is driven. The current value flowing from the drive unit 133 is detected by the current detection unit 101, and the unbalanced position A of the laundry 18 in the drum 3 can be grasped by the current change, and the current value change is as shown in FIG. To change. When the unbalanced position A is at the bottom as seen from the front of the washing machine body as shown in FIG. 3A, the current value is at the position of the current b shown in FIG. When moving to, the current value changes from current b to current a1. Thereafter, as the current value rotates, the unbalanced position A returns to the bottom and the current value also decreases. By detecting this state repeatedly by the current detector 101, the unbalance position A in the rotation circumferential direction of the drum 3 can be easily grasped.

  The unbalance position and amount in the depth direction of the drum 3 from the unbalance amount calculation means 31 and the unbalance position calculation means 30 are already determined from the vibration displacement of the vibration detection means (multi-axis vibration sensor) 10 when the drum 3 rotates at about 120 rpm. Therefore, for each condition of the unbalance position and amount, how the relative position of the position of the ball 9 of the ball balancer 8 and the unbalance position A in the rotational circumferential direction is arranged to determine the drum 3. Since it is obtained from the experimental results that the vibration can be suppressed most by passing the resonance rotational speed of the predetermined number of times, the determination unit 131 is determined from the rotational speed of the drum 3 in a state where the ball 9 is biased to the bottom. The motor 12 is controlled so as to increase to the resonance rotational speed within the time and further rotate the drum 3 to the rotational speed above it (for example, about 500 rpm). That.

  As a result, the vibration displacement of the washing tub 22 at the resonance rotational speed of the drum 3 can be suppressed to the minimum.

  Here, in the relative position between the unbalanced position A of the ball 9 and the laundry 18 at the time of dehydration start, the rotation control device (ball balancer) 8 is disposed in the front portion of the drum 3 as shown in FIG. In the case of (b) or (d), about 180 degrees, and in the case of FIG. 3 (c), the ball 9 is basically arranged in the ball balancer 8, and the arrangement is further divided according to the amount of unbalance. It has been found that vibration can be minimized by performing the method.

  In the case of FIG. 3E, when the unbalance position A is generated at the diagonal positions of the front side and the rear side, depending on whether the center of gravity position of the unbalance position A is arranged at the front side or the rear side position. Further, the arrangement of the balls 9 can be further divided to suppress vibrations to a minimum.

  Accordingly, the vibration detection means (multi-axis vibration sensor) 10 accurately grasps the displacements of the left and right vibrations and the longitudinal vibrations at a rotation speed of about 120 rpm, and determines the unbalance amount and the unbalance position, thereby determining the vibration at the resonance rotation speed. By grasping the arrangement of the ball 9 in the ball balancer 8 and the relative position of the unbalanced position A in advance from the condition of the unbalanced state so that it can be minimized, it can be activated with an optimum arrangement, and stable dehydration activation. Can be done.

  Further, the vibration displacement of the vibration detecting means (multi-axis vibration sensor) 10 can be detected with a certain level or more by rotation at about 120 rpm, and the ball 9 repeats dispersion and bias due to oil viscosity due to the characteristics of the ball balancer 8. It is possible to accurately detect the left-right vibration and the longitudinal vibration displacement by rotating in a stable arrangement without performing a proper movement, and to accurately detect the unbalance amount and the unbalance position. In the conventional fluid balancer, since the viscosity is only water, the movement is frequently repeated. Therefore, it is difficult to accurately detect the displacement because the arrangement with the unbalanced position A always changes.

  As described above, the drum type washing machine according to the present invention can accurately determine the unbalance amount and unbalance position of the laundry only by arbitrary two-axis vibration displacement of the multi-axis vibration detector disposed in the upper front part of the drum. By grasping and realizing the relative arrangement of the ball balancer's ball and the unbalanced position as the optimum dehydration activation method in that state by driving the motor as a condition obtained from the experiment, vibration when passing through the resonance rotational speed is realized. It can be greatly suppressed, and is useful for home and commercial drum-type washing machines and drum-type washing and drying machines.

1, 10A Washing machine body (housing)
3, 30A drum (rotating tank)
4 Drum pulley 5 Motor pulley 6 Belt 8 Rotation control device (ball balancer)
9 Ball 10, 50A Vibration detection means (multi-axis vibration sensor)
101 Current detector (motor current detection)
DESCRIPTION OF SYMBOLS 102 Clothing amount determination part 12, 40A Motor 13, 60A Control part 131 Determination part 132 Rotation control part 133 Drive part 18 Laundry 22, 20A Washing tub 30 Unbalance position calculation means 31 Unbalance amount calculation means A Unbalance position

Claims (4)

A housing,
A washing tub elastically supported inside the housing;
A rotatable tub stored in the washing tub and rotatable;
A drive unit for rotationally driving the rotary tank;
A ball balancer provided on the circumference of the rotating tank;
A vibration detector provided in the washing tub;
In a drum-type washing machine including a control unit that controls the drive unit based on an output from the vibration detection unit,
The control unit is an unbalance amount and a clothing bias position, which is a clothing bias amount from any two-axis output of the vibration detection unit, with the rotating tub maintained at a predetermined rotational speed equal to or lower than a resonance rotational speed. A drum-type washing machine comprising an unbalance determination unit that calculates an unbalance position. The unbalance determination unit determines an unbalance amount and an unbalance position within a range that is equal to or less than a resonance rotation number of the rotation speed of the rotating tub and a minimum rotation speed at which clothing in the rotation tank sticks to the inner wall of the rotation tank. The drum type washing machine according to claim 1, wherein The drum type washing machine according to claim 1 or 2, wherein the unbalance determination unit calculates an unbalance amount and an unbalance position from a biaxial output of left and right vibrations and front and rear vibrations of the vibration detection unit. The drum type washing machine according to any one of claims 1 to 3, wherein the vibration detection unit is provided at an upper front portion of the washing tub.

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