JP2009100985A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the rotation of a rotary tub so as not to abnormally vibrate an outer box and a water tub even when the natural frequency of a washing machine including a floor is changed by the strength of the floor to install the outer box. <P>SOLUTION: The washing machine is provided with an acceleration sensor for detecting the vibration of the water tub and an acceleration sensor for detecting the vibration of the outer box, and the rotation of the rotary tub during spin-drying of a washing operation is controlled by being changed to a pattern according to the detected vibrations of both acceleration sensors for the water tub and for the outer box. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a washing machine in which the rotation of a rotating tub is controlled by the vibration of a water tub provided with a rotating tub and the vibration of an outer box.

In the drum type washing machine, the laundry stored in the rotating tub is dehydrated by rotating the rotating tub (drum) at a high speed. During the dehydration, if the laundry in the rotating tub is unevenly distributed, this becomes an unbalanced load and the rotating tub swings, causing the water tub to vibrate or generating noise. Therefore, conventionally, the vibration of the water tank is detected by a vibration sensor, and the rotation of the rotating tank is controlled according to the vibration amplitude of the water tank detected by the vibration sensor (for example, Patent Document 1).
In addition, the vibration of the aquarium is further transmitted to the outer box of the washing machine. However, if the vibration of the outer box increases, the user may feel uncomfortable. In some cases, the rotation of the drum is controlled according to the size of the drum (for example, Patent Document 2).
Japanese Patent No. 3865791 JP 2006-31886 A

The vibration of the water tank and the outer box is greatly affected by the strength of the floor on which the washing machine is installed. That is, since the outer box of the washing machine is elastically supported via the floor of the building with respect to the ground, the vibration of the outer box is also affected by the strength of the floor. For example, when the floor strength is low, the natural frequency of the outer box including the floor is lower than that of the normal strength floor. The vibration of the outer box should not be so noticeable, but the vibration of the outer box becomes unexpectedly large.
Thus, since the vibration of the washing machine is affected by the floor, as in Patent Document 1, it is not possible to keep the vibration of the outer box low by simply controlling the rotation of the rotating tub taking into account only the vibration of the water tub. Have difficulty.

  Moreover, in patent document 2, the reference value according to the rotation speed of a rotation tank is memorize | stored about the vibration of an outer case, The reference value according to the actual vibration of an outer case and the rotation speed of a rotation tank at that time, Specifically, the balance that controls the rotation of the rotating tub, specifically, when the actual vibration of the outer box exceeds the reference value, the rotational speed of the rotating tub is reduced to correct the laundry bias. When the operation is performed and the unevenness of the laundry is corrected, a configuration is adopted in which the rotational speed of the rotating tub is increased to the final target rotational speed.

  However, the configuration of Patent Document 2 causes the following problems. In other words, if the floor strength is weak, even the slight vibration of the aquarium increases the vibration of the outer box, so even if there is a slight bias in the laundry that cannot be corrected by balance operation, the rotational speed of the rotating tub is relatively low. In some cases, the amplitude of the outer box exceeds the reference value. In such a case, the problem arises that the dehydration operation time elapses without being able to rotate the rotating tank at high speed. On the contrary, in the zone where the rotational speed of the rotating tank is low, even if the water tank is greatly shaken, the vibration of the outer case may be relatively small, and in this case, the noise increases without detecting abnormal vibration, The rotating tank may not be able to sufficiently increase the rotation speed due to a large swing of the water tank.

  The present invention has been made in view of the above circumstances, and its purpose is to make the outer box and the water tank abnormal even if the natural frequency of the washing machine including the floor changes due to the strength of the floor on which the outer box is installed. It is in providing the washing machine which can control rotation of a rotation tank so that it may not vibrate.

  The present invention provides a water tank for detecting vibration of the water tank in a washing machine in which a rotating tank for washing and dewatering is disposed in the water tank to constitute a tank body, and the tank body is elastically supported in an outer box. The vibration detection means, the vibration detection means for the outer box for detecting the vibration of the outer box, and the rotation of the rotating tank during dehydration correspond to the detected vibrations of both the vibration detection means for the water tank and the outer box. There is a washing machine comprising a control means for controlling by changing to a pattern.

  According to this configuration, since the vibration of both the water tank and the outer box is detected and the rotation of the rotating tank is controlled in a pattern corresponding to the detected vibration, the outer box vibrates more greatly than the water tank, or the water tank The rotation of the rotary tank can be sufficiently increased while preventing large vibrations compared to the outer box.

  Hereinafter, an embodiment in which the present invention is applied to a drum type washing and drying machine will be described with reference to the drawings. FIG. 1 shows the overall configuration of a drum-type washing / drying machine. As shown in FIG. 1, rubber legs 1 b are attached to the four corners of the bottom surface of the base plate 1 a constituting the bottom of the outer box 1. A water tank 2 is disposed in the outer box 1, and a rotating tank (drum) 3 is disposed in the water tank 2. The water tank 2 and the rotating tank 3 are concentric and constitute a tank body 4. The tank body 4 has a horizontal axis shape in which the rotation center axis C direction of the rotary tank 3 is the front-rear direction, and has an upwardly inclined shape.

  A pair of left and right vibration damping dampers 5 are disposed on the base plate 1 a of the outer box 1, and the water tank 2 is elastically supported by the pair of left and right vibration damping dampers 5. As shown in the figure, the pair of anti-vibration dampers 5 are arranged so as to be inclined so as to form a “C” shape with the lower side expanded in a front view. Moreover, the water tank 2 is elastically supported by the top plate 1c of the outer case 1 in the upper part by the tension coil spring 6 as an elastic member.

  As shown in FIG. 3, the vibration damping damper 5 is disposed concentrically with a friction damper mechanism 7 in which a piston 7b is slidably disposed in a cylinder 7a, and a piston rod 7c of the friction damper mechanism 7. And a compression coil spring (elastic member) 8. In this vibration damping damper 5, the upper end of the cylinder 7a is connected to the water tank 2, the lower end of the piston rod 7c integral with the piston 7b is connected to the base plate 1a, and the compression coil spring 8 is connected to the cylinder 7a. Between the base plate 1a, the water tank 2 is elastically supported via the cylinder 7a.

  Both the water tank 2 and the rotating tank 3 have a cylindrical shape with the front surface portion opened. Among these, the front opening part of the water tank 2 and the laundry entrance / exit 9 formed in the front part of the outer box 1 are connected by a bellows 10. The outer box 1 is provided with a door 11 for opening and closing the entrance 9. The rotating tub 3 in which the laundry put in from the entrance / exit 9 is accommodated is also used as a washing, dehydration and drying tub.

  A water supply case 13 connected to the water supply valve 12 is disposed inside the upper portion of the outer box 1. The water supply valve 12 is connected to a faucet through a hose, and supplies tap water into the water tank 2 through a detergent charging chamber (not shown) in the water supply case 13 at the time of washing. It is comprised so that it may supply in the water tank 2 through a chamber. The water supplied into the water tank 2 is supplied into the rotary tank 3 through a large number of small holes 3 a formed in the peripheral side portion and the rear surface portion of the rotary tank 3.

A drain port 14 is formed at the bottom of the water tank 2, a drain valve 15 is connected to the drain port 14, and a drain hose 16 is connected to the drain valve 15. Then, at the end of washing and at the time of dehydration, washing water and water dehydrated from the laundry are discharged to the outside from the drain port 14 via the drain valve 15 and the drain hose 16.
A washing machine motor 17 is attached to the outside of the rear end surface of the water tank 2. The washing machine motor 17 is composed of a three-phase brushless DC motor, and its rotating shaft 17 a is connected to the rotating tub 3. The washing machine motor 17 is controlled in rotation speed by the PWM method, and rotates the rotating tub 3 at a relatively low speed during washing and drying, and rotates the rotating tub 3 at a high speed during dehydration.

A hot air outlet 18 is formed on the upper front side of the water tank 2, and a hot air inlet 19 is formed on the upper end of the rear end surface. The warm air outlet 18 and the warm air inlet 19 are connected by a ventilation path 20. The ventilation path 20 has bellows tubes 21 and 22 at both front and rear ends, and the water tank 2 and the ventilation path 20 are connected by connecting the bellows tubes 21 and 22 to the warm air outlet 18 side and the warm air inlet 19 side, respectively. The transmission of vibration between them is reduced.
A circulation fan 23 is disposed at the rear of the ventilation path 20. This circulation blower 23 is activated during the drying operation, sucks air in the water tank 2 (rotary tank 3) from the hot air outlet 18 into the ventilation path 20, and passes through the ventilation path 20 in front of the outer box 1. Circulate from the side to the rear side and return from the hot air inlet 19 back into the water tank 2 (rotating tank 3).

  In the ventilation path 20, an evaporator 24 is disposed on the front side that is the upstream side, and a condenser 25 is disposed on the rear side that is the downstream side. The evaporator 24 and the condenser 25 exchange heat with air flowing through the ventilation path 20. The evaporator 24 and the condenser 25 constitute a heat pump 27 together with the compressor 26 disposed on the base plate 1a. The heat pump 27 is activated during the drying operation, dehumidifies the air sucked into the ventilation path 20 by the evaporator 24, and then heats it by the condenser 25 to return it to the water tank 2. Thereby, the laundry in the rotating tub 3 is dried.

Now, in order to detect the vibration which generate | occur | produces in this in the water tank 2, the two acceleration sensors 28 and 29 are provided as a vibration detection means for water tanks, for example. These acceleration sensors 28 and 29 are the outer peripheral part of the water tank 2 and are spaced forward and backward in the direction of the rotation center axis C at a position inclined 45 degrees upward with respect to a horizontal line orthogonal to the rotation center axis C of the rotation tank 3. Arranged.
In addition, the outer box 1 is provided with, for example, one acceleration sensor 30 as outer box vibration detection means in order to detect vibrations generated in the outer box 1. The acceleration sensor 30 is disposed on the upper inner surface of the outer box 1.

  The acceleration sensors 28 to 30 can detect vibrations in a three-dimensional direction, and the vibration detection configuration includes a support portion provided with a weight, and a resistance value of the strain at the time of bending deformation of the support portion. And detecting the magnitude of acceleration in the direction of each detection axis based on a change in resistance value of the piezoresistance element caused by acceleration in the detection axis X, Y, and Z directions applied to the weight. Is. In the following description, the acceleration sensors 28 and 29 are referred to as a water tank front acceleration sensor 28 and a water tank rear acceleration sensor 29, respectively, and the acceleration sensor 30 is referred to as an outer box acceleration sensor 30.

FIG. 2 shows a control device 31 of the washing / drying machine. The control device 31 is mainly composed of a microcomputer, and functions as a control means for controlling the overall operation of the washing / drying machine. The control device 31 has a water level detection from a water level sensor 33 provided to detect various operation signals and a water level in the water tank 2 from an operation input unit 32 including various key switches provided on an operation panel (not shown). A rotation number detection signal from a rotation number detection unit (rotation number detection means) 34 provided to detect the rotation number of the washing machine motor 17, vibration detection signals from both the front and rear acceleration sensors 28 and 29 for the aquarium, A vibration detection signal or the like from the outer box acceleration sensor 30 is input. In addition, the control apparatus 31 is provided in the upper front side in the outer case 1 (refer FIG. 1).
Then, the control device 31 drives the water supply valve 12, the drain valve 15, the washing machine motor 17, the circulation fan 23, and the compressor 26 through the drive circuit 35 based on the various input signals and the control program stored in advance. The display 36 and the buzzer 37 serving as notification means are controlled via the drive circuit 35.

  By the way, as is well known, in the washing operation, after the detergent washing operation and the rinsing washing operation, a dehydration operation for rotating the rotating tub 3 at a high speed is performed. During the dehydration operation, if the laundry in the rotating tub 3 is unevenly distributed, this becomes an unbalanced load, and the rotating tub 3 vibrates the water tank 2, and the outer box 1 also vibrates due to the vibration of the water tank 2. . Since the rotation of the rotary tank 3 is very slow at the start of the dehydration operation, the rotary tank 3 swings around due to the unbalanced load and shakes the outer box 1. At this time, vibration noise is not a problem, but if the outer box 1 or the rotating tank 3 swings abnormally greatly, the rotating tank 3 hits the outer box 1 or the rotating tank 3 sufficiently increases the rotation speed. Or the outer box 1 hits adjacent furniture. Further, in the process in which the rotating tub 3 increases the rotational speed toward the final target rotational speed, the outer case 1 vibrates in resonance with the vibration of the rotating tub 3 and generates an harsh vibration sound. The vibration of the outer case 1 and the water tank 2 during such dehydration operation is affected by the strength of the floor on which the washing / drying machine is installed.

  That is, as shown in FIG. 3 showing the vibration system of the washing and drying machine as a model, the outer box 1 has rubber legs 1b and floors F (including a plastic waterproof pan on which the washing machine is placed) provided at the lower four corners. The tank body 4 (the water tank 2 and the rotating tank 3) is elastically supported by the outer box 1 by means of an anti-vibration damper 5 and a tension coil spring 6. For this reason, the vibration of the outer box 1 and the water tank 3 is affected by the strength of the floor F, and the lower the strength of the floor F (the more easily the floor F is bent), the lower the natural frequency of the outer box 1 is.

  On the other hand, the vibrations of the outer box 1 and the water tub 2 are caused by the unbalanced distribution of the laundry in the rotating tub 3, so that the vibration frequency substantially matches the rotational speed of the rotating tub 3. Therefore, in order to suppress the vibration of the outer case 1 and the water tank 3, particularly the vibration amplitude when the rotating tank 3 increases the rotational speed toward the final target rotational speed, the rotational speed of the rotating tank 3 is inherent to them. What is necessary is just to let it pass rapidly through the rotation speed zone | band which corresponds to a frequency. Therefore, in the present embodiment, the strength of the floor F is determined, the natural frequency of the outer box 1 corresponding to the determined floor strength is obtained, and the rotation speed band that matches the natural frequency of the outer box 1 is determined. The number of rotations of the rotating tank 3 was controlled so as to pass quickly.

  In order to perform such control, the inventor installed the washer / dryer on a model floor with three levels of strength, “very weak floor”, “weak floor”, and “normal floor”, and rotated the unbalanced load. A vibration amplitude measurement test was performed in which the rotating tank 3 was rotationally driven by being attached to the tank 3. From this measurement result, the resonance frequency of the outer box 1 in each strength model floor and the amplitude threshold (predetermined amplitude) Bn common to the three levels of the model floor are obtained, and the amplitude of the outer box 1 is the amplitude Bn. The resonance frequency of the outer box 1 for each model floor was determined from the number of rotations of the rotating tank 3 when exceeding. As described above, the lower the strength of the floor F is, the lower the natural frequency of the outer box 1 is. Therefore, when the amplitude of the outer box 1 exceeds the predetermined amplitude Bn, the number of rotations of the rotary tank 3 is low. The floor becomes weak.

Here, the amplitudes of the outer casing 1 and the water tank 2 are obtained from the detected accelerations of the respective acceleration sensors 28 to 30. Since the physical quantity actually detected by each of the acceleration sensors 28 to 30 is acceleration, the control device 31 is used. Calculates the amplitude based on the acceleration detected by the acceleration sensors 28 to 30 and the rotational speed of the washing machine motor 17 detected by the rotational speed detector 34 at that time. In the following, description will be made as if the acceleration sensors 28 to 30 directly detect the vibration amplitude. Further, in the present embodiment, since the rotary tub 3 is directly connected to the rotary shaft 17a of the washing machine motor 17, the rotational speed detected by the rotational speed detector 34 becomes the rotational speed of the rotary tub 3 as it is.
The relationship between the strength of the floor F thus obtained and the rotation speed range of the rotating tub 3 that is passed quickly according to the floor of each strength is “normal floor”, “weak floor”, “very weak floor”. On the other hand, it is 600-700 rpm, 500-600 rpm, 400-500 rpm, for example.

  Furthermore, in the present embodiment, the final target rotational speed of the rotating tub 3 is changed according to the strength of the floor F. For example, 1000 rpm is set for “very weak floor”, 1200 rpm for “weak floor”, and 1300 rpm for “normal floor”. The reason why the final target rotational speed is changed according to the strength of the floor F in this way is that the unbalanced load portion (heavy portion) moves from top to bottom and rises as the rotating tub 3 rotates. A shocking force such as hitting the outer box 1 downward is applied, but this shocking force is finally transmitted from the outer box 1 to the floor F. For this reason, the lower the strength of the floor, the smaller the number of downward impacts transmitted from the outer box 1 is, the better the floor is protected. The rotation speed is lowered.

  As a result, the rotation pattern of the rotating tub 3 for each strength floor during the dehydration operation is as shown in FIG. 6, (a) is “normal floor”, (b) is “weak floor”, ( c) is the case of a “very weak floor”. Note that the rotation pattern in the case of “normal floor” in FIG. 6A is stored as a default program in a ROM (storage means) (not shown) of the control device 31, and in the case of “weak floor” in FIG. The rotation pattern is stored as the program B in the ROM, and the rotation pattern for the “very weak floor” in FIG. 6C is also stored as the program A in the ROM.

By the way, in this embodiment, when the washing / drying machine is installed at the home where the washing / drying machine is purchased, an inspection operation for inspecting whether or not the installation is performed successfully can be performed. And when actually operating the washing and drying machine, the rotation of the rotating tub 3 is controlled while taking into account the strength of the floor to suppress the vibration of the outer case 1 and the water tub 2.
The inspection operation is performed by rotating the rotating tub 3 while fixing a weight provided as an accessory to the washing and drying machine to a predetermined position on the inner peripheral surface of the rotating tub 3. The contents of this inspection operation will be described according to the flowchart shown in FIG.

  A weight is fixed in the rotating tub 3, and the operation input unit 32 is operated to start an inspection operation. Then, the control device 31 energizes the washing machine motor 17 until the rotating tub 3 reaches a final target rotation speed of normal dehydration operation, for example, 1300 rpm, at a predetermined acceleration, for example, acceleration of 100 rotations per 30 seconds (target). Rotate (repetition of steps S1 to S3). During this time, the control device 31 monitors whether or not the detected amplitude of the outer box acceleration sensor 30 exceeds the predetermined amplitude Bm. If the detected amplitude does not exceed the predetermined amplitude Bm, it is determined that the installation is good, and the washing machine motor 17 is turned on. The power is cut off, and this is displayed on, for example, the display 36 provided on the operation panel, and the inspection operation is terminated (“NO” in step S2, “YES” in step S3, steps S4 and S5).

  When the detected amplitude of the outer box acceleration sensor 30 exceeds the predetermined amplitude Bm, the control device 31 cuts off the electric power of the washing machine motor 17 and then displays an improper installation on the display 36 to end the inspection operation ( “YES” in step S2, steps S6 and S7). If the display 36 displays “good installation”, the user moves to use of the washing / drying machine as the installation is completed. If the display unit 36 displays “Fixed installation”, for example, all four rubber legs 1b are in contact with the floor F, or the water tank 2 is fixed so that it does not shake during packing of the washing / drying machine. Check whether the fixing tool is removed, and perform the inspection operation again.

When the dehydration operation is started during the normal washing operation, the control device 31 controls the rotation of the washing machine motor 17 as shown in the flowchart of FIG. That is, when entering the dehydration operation, the control device 31 energizes the washing machine motor 17 to rotate the rotating tub 3 (step A1). At this time, the control device 31 controls the washing machine motor 17 so that the speed of the rotating tub 3 is increased at a rate of 100 rotations in 30 seconds, for example. In this speed increasing process, the control device 31 determines whether or not the detected amplitudes of the front and rear acceleration sensors 28 and 29 for the water tank are equal to or higher than the abnormal amplitudes Ad1 and Ad2, respectively, until the rotating tank 3 reaches a predetermined rotational speed. It is monitored whether or not the detected amplitude of the acceleration sensor 30 is greater than or equal to the abnormal amplitude Bd (steps A2 to A4).
The vibrations on both the front and rear sides of the aquarium 2 are usually larger at the front than at the rear, so that the abnormal amplitude Ad1 for the front aquarium acceleration sensor 28 is larger than the abnormal amplitude Ad2 of the aquarium rear acceleration sensor 29. It has been. Further, the abnormal amplitude Bd of the outer box 1 is a value larger than the predetermined amplitude Bn in the process of increasing the rotational speed of the rotating tub 3 described above.

  The detection amplitude of the front aquarium acceleration sensor 28 is greater than or equal to the abnormal amplitude Ad1, the detection amplitude of the rear aquarium acceleration sensor 29 is greater than or equal to the abnormal amplitude Ad2 (“YES” in step A2), or the acceleration sensor 30 for the outer box When the detected amplitude becomes equal to or greater than the abnormal amplitude Bd (“YES” in step A3), the control device 31 temporarily turns off the washing machine motor 17 to stop the rotating tub 3 and performs an unbalance correction operation ( Steps A5 to A7). The content of the unbalance correction operation is that the speed is gradually increased at an acceleration lower than 100 rotations in 30 seconds in the low-speed rotation range (for example, 50 to 70 rpm) before the laundry sticks to the inner peripheral surface of the rotating tub 3. Is. If the unbalance of the laundry is not corrected even after this unbalance correction operation is performed a predetermined number of times (for example, 5 times), the control device 31 disconnects the washing machine motor 17 to turn off the buzzer 37 or the display device. 36 (“NO” in step A5, steps A8 and A9).

  The detection amplitudes of the front and rear acceleration sensors 28 and 29 for the water tank do not exceed the abnormal amplitudes Ad1 and Ad2, respectively, and the detection amplitude of the outer box acceleration sensor 30 does not exceed the abnormal amplitude Bd and the rotation speed of the rotary tank 3 If the speed increases until the rotation speed exceeds the predetermined rotation speed (“YES” in step A4), the control device 31 then determines that the detected amplitude of the outer box acceleration sensor 30 exceeds the predetermined amplitude Bn (smaller than the abnormal amplitude Bd). It is in a state of monitoring whether or not (“NO” in step A10, “YES” in step A11).

  When the rotation speed of the rotating tub 3 reaches 600 rpm or more without the detection amplitude of the outer box acceleration sensor 30 exceeding the predetermined amplitude Bn (“NO” in step A10, “NO” in step A11), the control device 31 It is determined that F is normal strength (floor strength determining means), and a default program is selected as a program for controlling the rotation of the rotating tub 3 (step A12). And the control apparatus 31 controls the washing machine motor 17 so that the time which the rotation tank 3 speed-rises from 600 rpm to 700 rpm becomes 15 seconds quicker than another speed range, and the rotation speed of the rotation tank 3 is normal intensity | strength. So as to pass through the natural frequency band of the outer box 1 of the floor earlier, and the final target rotational speed is set to 1300 rpm. Thereafter, when the number of rotations of the rotating tub 3 exceeds 700 rpm, the control device 31 controls the washing machine motor 17 with an original acceleration such that the rotating tub 3 increases by 100 rotation speeds in a normal 30 seconds, and then rotates. When the tank 3 reaches the final target rotation speed of 1300 rpm, the rotation speed is maintained until the set dehydration time elapses, and the dehydration operation is terminated when the dehydration time elapses ("YES" in step A17). Step A18).

  On the other hand, when the detection amplitude of the outer box acceleration sensor 30 exceeds the predetermined amplitude Bn in the state where the rotation tank 3 is less than 600 rpm (“YES” in step A10), the control device 31 detects when the predetermined amplitude Bn is exceeded. When the rotation speed of the rotating tank 3 is acquired from the rotation speed detector 34 and the rotation speed at that time is 400 rpm or less (“YES” in step A13), it is determined that the floor F is very weak (floor strength determination means) When the program A is selected and the washing machine motor 17 is controlled so that the time required for the rotation tank 3 to increase from 400 rpm to 500 rpm is 15 seconds, the rotation speed of the rotation tank 3 is a very weak floor. So as to pass through the natural frequency band of the outer box 1 early, and the final target rotational speed is set to 1000 rpm (step A14).

  Thereafter, when the rotational speed of the rotating tub 3 exceeds 500 rpm, the control device 31 controls the washing machine motor 17 so that the rotating tub 3 increases its speed at an acceleration of 100 rotations in a normal 30 seconds, and the rotating tub 3 3 reaches the final target rotation speed of 1000 rpm, the rotation speed is maintained until the set dehydration time elapses, and the dehydration operation is terminated when the dehydration time elapses ("YES" in step A17, Step A18).

  When the number of rotations when the detected amplitude of the outer box acceleration sensor 30 exceeds the predetermined amplitude Bn exceeds 400 rpm and is 500 rpm or less (“NO” in step A13, “YES” in step A14), the control device 31 The program B is selected as a program for determining that the floor is weak (floor strength determining means) and controlling the rotation of the rotating tank 3, and the time for the rotating tank 3 to rise from 500 rpm to 600 rpm is 15 seconds. The washing machine motor 17 is controlled so as to pass through the natural frequency band of the outer box 1 when the rotational speed of the rotary tub 3 is a weak floor, and the final target rotational speed is set to 1200 rpm (step A16). .

  Thereafter, when the rotational speed of the rotating tub 3 exceeds 600 rpm, the control device 31 controls the washing machine motor 17 so that the speed of the rotating tub 3 increases at an acceleration of 100 rotations in a normal 30 seconds. When 3 reaches the final target rotation speed of 1200 rpm, the rotation speed is maintained until the set dehydration time elapses, and the dehydration operation is terminated when the dehydration time elapses ("YES" in step A17, Step S18).

  When the rotation speed when the detected amplitude of the outer box acceleration sensor 30 exceeds the predetermined amplitude Bn exceeds 500 rpm (“NO” in step A13, “NO” in step A15), the control device 31 It is determined that the floor is strong and the default program is selected, and the washing machine motor 17 is controlled so that the time required for the rotating tub 3 to increase from 600 rpm to 700 rpm is 15 seconds as described above, and the final target is set. The rotational speed is set to 1300 rpm (step A12).

  Thereafter, as described above, when the rotational speed of the rotating tub 3 exceeds 700 rpm, the control device 31 controls the washing machine motor 17 so that the speed of the rotating tub 3 increases at an acceleration of 100 rotations in a normal 30 seconds. When the rotation tank 3 reaches the final target rotation speed of 1300 rpm, the rotation speed is maintained until the set dehydration time elapses, and the dehydration operation is terminated when the dehydration time elapses (step). "YES" at A17, step A18).

  As described above, according to the present embodiment, even when the water tank 2 is greatly touched at the beginning of the dehydration operation and the rotation speed of the rotating tank 3 cannot be increased, or even when the vibration of the water tank 2 is small. When the outer box 1 is abnormally vibrated and shakes greatly, the unbalance correction operation is performed or the dehydration operation is stopped, so that the trouble that the water tank 2 or the outer box 1 vibrates abnormally can be prevented. .

  In addition, since the speed band of the rotary tub 3 that passes at a high acceleration is changed according to the strength of the floor on which the washing / drying machine is installed, the natural frequency of the outer box 1 varies depending on the strength of the floor. However, it is possible to effectively prevent the occurrence of a problem that the outer box 1 vibrates greatly due to a resonance state.

The present invention is not limited to the embodiments described above and shown in the drawings, and can be expanded or changed as follows.
The determination of the strength of the floor (steps A10 to A16) is performed only during the first washing after installation, and thereafter, the rotation of the rotating tub 3 is performed at the number of rotations corresponding to the strength of the floor determined during the first washing. You may make it control.
The determination of the strength of the floor (step A10 to step A16) is not performed at the time of washing, but is performed by attaching a weight as an accessory to the rotating tub at the time of installation. The structure which controls rotation of the rotation tank 3 according to the intensity | strength of the floor which was left may be sufficient.

When determining the strength of the floor (step A10 to step A16) only at the time of installation or at the time of the first washing after the installation, the floor is checked every time a certain use interval, for example, the number of washings reaches a predetermined number (for example, 600 times). You may comprise so that the intensity | strength determination may be performed. The number of washings is, for example, detected by turning on / off the power switch of the washing / drying machine and counting the number of washings as one wash. In this case, it is possible to adopt a configuration in which the fact that the number of times of washing has reached 600 is displayed on the display 36 as a notification means.
A drum type washing machine without a drying function may be used. Moreover, the usual dehydrating combined washing machine which has arrange | positioned the rotation tank and the water tank in the vertical axis | shaft type may be sufficient.

1 is a longitudinal side view of a washing / drying machine showing an embodiment of the present invention. Block diagram showing electrical configuration Diagram showing the vibration system of a washing dryer Flowchart showing control contents of pass / fail judgment of installation of washing / drying machine Flow chart showing contents of rotation control of rotating tank in dehydration operation The figure which shows the rotation pattern of the rotation tank according to the strength of the floor

Explanation of symbols

  In the drawings, 1 is an outer box, 2 is a water tank, 3 is a rotating tank, 4 is a tank body, 5 is an anti-vibration damper, 8 is a compression coil spring, 17 is a washing machine motor, and 28 and 29 are front and rear accelerations for the water tank. A sensor (water tank vibration detection means), 30 an outer box acceleration sensor (outer box vibration detection means), 31 a control device (control means), and 34 a rotation speed detection unit.

Claims (4)

In a washing machine formed by arranging a rotating tub for washing and dewatering in a water tub to constitute a tub body, and elastically supporting this tub body in an outer box,
Aquarium vibration detecting means for detecting the vibration of the aquarium;
Vibration detection means for the outer box for detecting the vibration of the outer box;
A washing machine comprising: control means for controlling the rotation of the rotating tub during dehydration by changing to a pattern corresponding to the detected vibration of the vibration detecting means for both the water tub and the outer box. The washing machine according to claim 1, wherein
The control means is a control for increasing the rotational speed of the rotating tank toward the final target rotational speed of the rotating tank when the detected vibration of the water tank vibration detecting means is not more than a predetermined value after the rotation of the rotating tank is started. The washing machine is characterized in that when the detected vibration of the outer case vibration detecting means exceeds the predetermined value, the rotational acceleration of the rotational speed band causing abnormal vibration is changed to be high. The washing machine according to claim 1 or 2,
The control means is a control for increasing the rotational speed of the rotating tank toward the final target rotational speed of the rotating tank when the detected vibration of the water tank vibration detecting means is not more than a predetermined value after the rotation of the rotating tank is started. And when the detected vibration of the outer box vibration detecting means exceeds the predetermined value, the final target rotational speed is changed according to the detected vibration of the outer box vibration detecting means. Washing machine. The washing machine according to any one of claims 1 to 3,
In the first washing operation, the control means controls the rotation of the rotating tub during dehydration by setting the pattern according to the detected vibration of both the water tank and the outer box vibration detecting means, and thereafter The rotation of the rotating tub during dehydration is controlled in the setting pattern until a certain use interval elapses, and thereafter, the rotation during dehydration is performed at the first washing operation every time the fixed use interval elapses. The rotation tank is set to a pattern corresponding to the vibration detected by the vibration detection means for both the water tank and the outer box, and the rotation tank at the time of dehydration in the first washing operation and at the time of dewatering in the subsequent washing operation. The washing machine is configured to repeatedly control the rotation of the washing machine.

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