Washing machine

Abstract

To provide a washing machine which suppresses vibration and noise according to a temperature characteristic, by simultaneously performing vibration detection and temperature detection and by controlling the rotational frequency of a motor.SOLUTION: A washing machine includes: a housing; a water tub supported in a vibration-proof manner by being elastically supported inside the housing; an inner tub rotatably disposed inside the water tub; a rotary shaft fixed to the bottom part of the inner tub, and protruding at the back surface side bottom part of the water tub; a pulley provided at the rotary shaft; a motor for rotationally driving the inner tub by rotating the rotary shaft via a belt wound around the pulley; vibration detection means for detecting vibration; temperature detection means for detecting a temperature; and control means for inputting information from the vibration detection means and the temperature detection means, and for controlling the motor. The control means sets a vibration threshold value corresponding to the rotational frequency from the vibration detection result from the vibration detection means, and performs an unbalance determination based on the vibration threshold value. The vibration threshold value corrects the vibration threshold value based on the temperature detection result from the temperature detection means.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to washing machines. [Background technology]

[0002] Patent Document 1 discloses a washing machine with a vibration detection means attached to its housing. This washing machine includes a drum, a tub that contains the drum and stores wash water, a motor that drives the drum to rotate, a housing that houses the tub, a vibration detection device that is composed of a digital output acceleration sensor that can detect vibrations of the tub in multiple directions and switch between multiple acceleration detection ranges, and control means that controls the motor and vibration detection device based on the output of this vibration detection. The control means performs vibration detection by switching the acceleration detection range for each direction or for all directions depending on the detected acceleration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-134214 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a washing machine that suppresses vibration and noise of the housing at each temperature. [Means for solving the problem]

[0005] The washing machine of the present disclosure comprises a housing, a water tub that is elastically supported inside the housing from above by a suspension and connected to the inside of the housing at the bottom by a damper to provide vibration-proof support, an inner tub that is rotatably arranged inside the water tub, a rotating shaft that is fixed to the bottom of the inner tub and protrudes from the bottom on the back side of the water tub, a pulley provided at the rear tip of the rotating shaft, a motor that rotates the rotating shaft via a belt that is attached to the pulley, vibration detection means that detects vibrations, temperature detection means that detects temperature, and control means that inputs information from the vibration detection means and temperature detection means and controls the motor, the control means sets a vibration threshold corresponding to the rotation speed based on the vibration detection result from the vibration detection means and performs imbalance judgment based on the vibration threshold, and corrects the vibration threshold based on the temperature detection result from the temperature detection means. [Effects of the Invention]

[0006] The washing machine of the present disclosure can suppress vibration and noise according to temperature characteristics by simultaneously detecting vibration and temperature and controlling the motor rotation speed, thereby achieving low vibration and low noise in the washing machine. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a washing machine according to a first embodiment; [Figure 2] FIG. 1 is a perspective view showing a front side of a water tub unit of a washing machine according to a first embodiment; [Figure 3] FIG. 1 is a perspective view showing a rear side of a water tub unit of a washing machine according to a first embodiment; [Figure 4] FIG. 1 is a schematic diagram showing a vibration and temperature detection device for a washing machine according to a first embodiment; [Figure 5] Graph showing amplitude for each drum rotation speed in a dehydration process of the washing machine according to the first embodiment. [Figure 6] Flowchart of vibration detection and determination when spin-drying of the washing machine is started in the first embodiment DETAILED DESCRIPTION OF THE INVENTION

[0008] (Findings that formed the basis of this disclosure) When the inventors came up with the idea for the present disclosure, they discovered that conventional vibration detection methods were unable to detect variations in vibration due to the temperatures of the components of a washing machine, and that vibrations and noise varied greatly depending on the ambient temperature of use. In order to solve this problem, they came up with the subject matter of the present disclosure. Therefore, the present disclosure provides a washing machine that suppresses vibration and noise of the housing at each temperature.

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of well-known matters or redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

[0010] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0012] [1-1.Configuration] [1-1-1. Washing machine configuration] The washing machine in this embodiment is configured as a drum type washing machine 100.

[0013] In FIG. 1, water tub 102 is disposed inside washing machine housing 110. Water tub 102 is formed in a cylindrical shape with a bottom that opens to the front, and is configured to be able to store water inside. A water supply path (not shown) that supplies tap water and a drain path 112 that drains water from inside water tub 102 are connected to water tub 102. Water is supplied to water tub 102 via the water supply path when a water supply valve (not shown) is open, and water is drained via drain path 112 when a drain valve (not shown) is open.

[0014] Rotating drum 101 is formed in a cylindrical shape with a bottom that opens forward, and is contained within water tub 102 so as to face the opening of water tub 102. Rotating drum 101 is configured to be rotated inside water tub 102 by drum drive motor 108, which will be described later.

[0015] A bearing case 103 having bearings 104 supporting rotating shaft 105 is provided at the bottom on the rear side of water tub 102. Rotating shaft 105 is provided at the rotation center of rotating drum 101, with its axis tilting downward from the front side to the rear side. A drum pulley 106 is provided at the bottom on the rear side of water tub 102, where rotating shaft 105 is located, and a drum drive motor 108 is provided below water tub 102. Drum drive motor 108 is connected to rotating shaft 105 via belt 107 and drum pulley 106, and drives rotating drum 101 to rotate in both forward and reverse directions.

[0016] Rotating drum 101, water tub 102, drum drive motor 108, bearing case 103, belt 107, drum pulley 106, etc. constitute water tub unit 109. Water tub unit 109 is a vibrating body that vibrates integrally with water tub 102 as it vibrates.

[0017] Water tub unit 109 is elastically supported within washing machine housing 110 by a plurality of suspensions 111. The lower ends of suspensions 111 are connected to the top of water tub 102, and the upper ends of suspensions 111 are connected to the top of washing machine housing 110.

[0018] The base 113, which is the lower part of the washing machine housing 110, is provided with housing connection parts 114 at four locations. The water tub unit 109 has two first dampers 115 and two second dampers 116. Water tank unit 109 is connected to base 113 by damper 116, i.e., four dampers. In this embodiment, four water tank connectors 118 and housing connectors 114 are arranged downwards toward the rear side. The four dampers connect water tank connectors 118 and housing connectors 114 to suppress vibration of water tank unit 109.

[0019] Furthermore, installation legs 117 are provided at the four corners of the bottom of base 113 at the bottom of washing machine housing 110.

[0020] 2 and 3, a water tank cover 119 is attached to the front side of the water tank 102. A vibration and temperature detection device 120 is attached to the top of the water tank cover 119.

[0021] [1-1-2. Configuration of vibration and temperature detection device] Next, the configuration of the vibration and temperature detection device 120 will be described with reference to Fig. 4. The vibration and temperature detection device 120 includes a printed circuit board 125, a water level detection means 123, a vibration and temperature detection means 124, and a controller cover 122.

[0022] The water level detection means 123 is composed of a MEMS (Micro Electro Mechanical Systems) sensor, which is a piezoresistive pressure sensor using silicon. The vibration and temperature detection means 124 is composed of a MEMS sensor, which is a three-axis acceleration sensor, and is a digital output type that can switch the acceleration detection range and has a built-in temperature sensor function.

[0023] The printed circuit board 125 is connected to the control means 127 via lead wires 126, and performs power supply control and transmits and receives communication signals. The lead wires 126 are, for example, a power supply line, a GND line, a pressure detection serial communication line, a vibration detection serial communication line, etc. The water level detection means 123 and the vibration and temperature detection means 124 are mounted on the printed circuit board 125. The printed circuit board 125 is enclosed by the controller cover 122 so that the surface on which the water level detection means 123 is mounted faces downward, and the downward direction of the vibration and temperature detection means 124 is the Z axis. The X axis and Y axis are as shown in FIG. 4.

[0024] In this embodiment, the vibration and temperature detection device 120 is equipped with vibration detection and temperature detection. If vibration detection means and temperature detection means were provided independently, it would be necessary to add electronic components such as a thermistor and resistor. Furthermore, by completing vibration detection and temperature detection within the same MEMS, it is possible to obtain a means for determining temperature variations in the vibration sensor itself while reducing the number of components and mounting area.

[0025] [1-2. Operation] The operation of the drum type washing machine 100 configured as above will be described below.

[0026] [1-2-1. Washing operation] The washing operation will be described below.

[0027] When the washing operation starts, the washing process is first carried out. In the washing process, after the water supply operation in which water is supplied into the water tub 102 is carried out, an agitation operation in which the rotating drum 101 rotates forward, stops, reverses, and stops repeatedly is carried out for a predetermined time. In the agitation operation, the clothes stored in the rotating drum 101 are lifted in the direction of rotation by several protruding plates for agitating the clothes, and then dropped from the lifted height. This causes a beating wash action to occur on the clothes stored in the rotating drum 101. Then, a spin-drying operation is carried out. In the spin-drying operation, the drain valve is opened, and the water in the water tub 102 is drained to the outside via the drain path 112. The rotating drum 101 is In this state, the water tub unit 109 is rotated at high speed for a predetermined time, whereby the water contained in the clothes is dehydrated by centrifugal force and drained through drain path 112. During the dehydration process, the water tub unit 109 vibrates greatly.

[0028] The rinse cycle is then performed. In the rinse cycle, similar to the wash cycle, a water supply operation is performed, followed by a stirring operation for a predetermined time. This dilutes the detergent components contained in the clothes and rinses them away.

[0029] After that, the dehydration process is performed. In the dehydration process, the final dehydration operation is performed. After the final dehydration operation is completed, the washing operation ends.

[0030] In the case of a drum-type washing machine having a drying function, the drying process may be performed after the spin-drying process is completed. After the drying process is completed, the washing and drying operation is completed.

[0031] [1-2-2. Operation during dehydration process] The operation in the dehydration step will be described below.

[0032] The rotation speed of rotating drum 101 during the spin-drying process increases through rotation speeds corresponding to each vibration mode, which will be described later, until it reaches a maximum rotation speed of 1600 r / min. During the spin-drying process, if the clothes contained in rotating drum 101 stick unevenly to the inner wall of rotating drum 101 due to centrifugal force, an unbalanced load occurs. The unbalanced load acts as a vibration source, causing rotating drum 101 to vibrate. The vibration of rotating drum 101 is transmitted to washing machine housing 110 via suspension 111 and four dampers, and then transmitted to the installation floor via installation legs 117 provided at the bottom of washing machine housing 110.

[0033] The vibration of water tub unit 109 causes the structure to resonate at its natural frequency. Table 1 shows the vibration modes of the spin-drying process. To suppress problems that may be caused by the resonance phenomenon that occurs in each vibration mode, it is necessary to detect the amplitude value in the vibration detection unit in each vibration mode and stop drum drive motor 108 or vary the target rotation speed of drum drive motor 108 in order to control the rotation speed of rotating drum 101.

[0034] [Table 1]

[0035] Furthermore, the behavior of vibrations changes depending on the temperature of the environment the washing machine is used in. For example, at high temperatures, the damping force of the four dampers decreases, and the vibration of the rotating drum 101 becomes maximum.

[0036] At low temperatures, the hardness of belt 107 increases, increasing the transmission of vibration from rotating drum 101 to washing machine housing 110, and the rubber damping performance of mounting legs 117 that connect the drum to the floor also decreases, resulting in maximum vibration of washing machine housing 110. To suppress vibration and noise in each case, it is necessary to install vibration and temperature detection device 120 in a location where it can properly detect the ambient temperature inside the washing machine and where it can properly detect vibration, and it is necessary to correlate the temperature with the vibration and perform temperature correction.

[0037] Table 1 will be used to explain the vibration mode in the dehydration process.

[0038] When the rotation speed of rotating drum 101 reaches a value corresponding to the natural frequency of water tank unit 109, primary resonance of water tank unit 109 occurs. Vibration mode A, which is the primary resonance of water tank unit 109, exists when the rotation speed of rotating drum 101 is in the range of 100 to 160 r / min. In vibration mode A, front-to-back and left-to-right vibration of water tank unit 109 occurs as a resonance phenomenon.

[0039] Vibration mode B, which is the secondary resonance of water tub unit 109, exists when the rotation speed of rotating drum 101 is in the range of 160 to 300 r / min. In vibration mode B, vertical / rotational vibration of water tub unit 109 occurs as a resonance phenomenon, which may cause problems such as water tub unit 109 colliding with washing machine housing 110.

[0040] When the rotation speed of rotating drum 101 reaches a value corresponding to the natural frequency of washing machine housing 110, washing machine housing 110 resonates. Vibration mode C, which is the resonance of washing machine housing 110, exists when the rotation speed of rotating drum 101 is in the range of 500 to 700 r / min. In vibration mode C, washing machine housing 110 vibrates back and forth and left and right as a resonance phenomenon. This resonance phenomenon may cause washing machine housing 110 to shake significantly, generating abnormal noise, or may cause problems such as washing machine housing 110 colliding with objects around drum type washing machine 100.

[0041] When the rotation speed of rotating drum 101 reaches a value corresponding to the natural frequency of the floor on which drum-type washing machine 100 is installed, resonance of the installation floor occurs. Vibration mode D, which is resonance of the installation floor, exists when the rotation speed of rotating drum 101 is in the range of 1000 to 1600 r / min. In vibration mode D, floor vibration occurs as a resonance phenomenon. In vibration mode D, although the amplitude of the vibration of water tub unit 109 itself is small, there is a risk that the resonance phenomenon will cause the floor on which drum-type washing machine 100 is installed to resonate and shake, resulting in a problem. In vibration mode D, the damping force of the four dampers is generated mainly in the horizontal direction, and is transmitted vertically to the floor and waterproof pan on which drum-type washing machine 100 is installed. Because the strength of the floor and waterproof pan to which the force is transmitted varies depending on the user's installation environment, there is a problem in that washing machine housing 110 shakes significantly at the controlled rotation speed of rotating drum 101 in vibration mode D.

[0042] [1-2-3. Vibration and temperature detection operation flow] The operational flow of the vibration and temperature detection will be described.

[0043] Vibration and temperature detection means 124 communicates with control means 127 using SPI (Serial Peripheral Interface) communication, and control means 127 acquires acceleration and temperature information for each of the X, Y, and Z axes. From the acceleration and the number of rotations of rotating drum 101, the difference between the maximum and minimum displacement values ​​for each rotation period for each of the X, Y, and Z axes is calculated as the amplitude.

[0044] The acceleration output of the vibration and temperature detection means 124 has an acceleration detection range (full scale) of 2G up to the rotation speed of the rotating drum 101 being less than 331 r / min, and an acceleration detection range (full scale) of 2G up to 331 r / min or more. The acceleration detection range (full scale) is switched to 8G to detect vibration.

[0045] 5 shows a graph of amplitude values ​​for each rotation speed of rotating drum 101 during the dehydration process. The left vertical axis represents amplitude values, the right vertical axis represents the rotation speed of the drum, and the horizontal axis represents time.

[0046] When checking the amplitude values ​​of each axis X, Y, and Z at room temperature 25°C, low temperature 0°C, and high temperature 40°C, it is clear that the vibration behavior differs depending on the rotation speed. This is due to the temperature variations of the four dampers and belt 107, as mentioned above. It also includes temperature variations of the vibration sensor.

[0047] At high temperatures, vibrations tend to be greater at low rotation speeds compared to room temperature. At low temperatures, vibrations tend to be greater at high rotation speeds compared to room temperature. Because there are differences in vibration values ​​like this, temperature correction is necessary.

[0048] A flowchart of the vibration and temperature detection operation is shown in Fig. 6. Table 2 is a data table of the rotation speed range B1, threshold C1, low temperature correction D1, and high temperature correction E1 in Fig. 6.

[0049] [Table 2]

[0050] When the control means 127 starts the dehydration operation in step S1, it turns on the drum drive motor 108 in step S2.

[0051] In step S3, the current rotation number of the drum drive motor 108 is detected, and in step S4, this is read out as the rotation number H1.

[0052] Next, in step S5, the rotation speed H1 is checked, the rotation speed range B1 in Table 2 is referenced, and the value of the threshold value C1 corresponding to the rotation speed range B1 is read out.

[0053] Next, in step S7, the amplitude values ​​of the X, Y, and Z axes and temperature information acquired by the vibration and temperature detection means 124 are read out, and in step S8, a temperature determination is performed. As shown in Table 2, temperature information is acquired for each rotation speed range.

[0054] If it is a normal temperature, the threshold value C1 is used for judgment; if it is a low temperature, the threshold value C1 is multiplied by the rate of low temperature correction D1 to obtain threshold value J1; if it is a high temperature, the threshold value C1 is multiplied by the rate of high temperature correction E1 to obtain threshold value J1.

[0055] In step S9, it is determined whether the amplitude values ​​of the X, Y, and Z axes acquired by the vibration and temperature detection means 124 are equal to or greater than the temperature-corrected threshold value J1. If they are equal to or greater than the threshold value J1, it is determined in step S10 that an imbalance abnormality has occurred, and in step S12, the drum drive motor 108 is stopped.

[0056] Thereafter, in step S13, the number of unbalance abnormality detections N1 is counted up, and if the number of unbalance abnormality detections N1 is 3 or more in step S14, an abnormality is notified and operation is stopped in step S15. If the number of unbalance abnormality detections N1 is less than 3, the process returns to step S3 in step S16.

[0057] In step S9, if the amplitude values ​​of the X, Y, and Z axes acquired by the vibration and temperature detection means 124 are less than the temperature-corrected threshold value J1, it is determined to be normal in step S11, the number of unbalance abnormality detections N1 is cleared, and normal operation continues.

[0058] In this embodiment, the control means 127 sets threshold values ​​(C1, J1) for determining an imbalance abnormality for each rotation speed of the drum drive motor 108 based on the temperature determination result detected by the vibration and temperature detection device 120. Since the influence of vibration changes depending on the rotation speed of the drum drive motor 108, setting threshold values ​​(C1, J1) for determining an imbalance abnormality for each rotation speed of the drum drive motor 108 makes it possible to suppress vibration with high precision.

[0059] [1-3. Effects, etc.] As described above, in this embodiment, drum type washing machine 100 comprises washing machine housing 110, water tub 102 that is elastically supported from above inside washing machine housing 110 by suspension 111 and that is connected at the bottom to the inside of washing machine housing 110 by first damper 115 and second damper 116, and is thereby supported in a vibration-isolating manner, rotating drum 101 that is rotatably disposed inside water tub 102, rotating shaft 105 that is fixed to the bottom of rotating drum 101 and protrudes from the bottom of the back side of water tub 102, drum pulley 106 that is provided at the rear tip of rotating shaft 105, drum drive motor 108 that rotates rotating shaft 105 via belt 107 that is wound around drum pulley 106, vibration detection means that detects vibrations, temperature detection means that detects temperature, and control means 127 that inputs information from the vibration detection means and the temperature detection means (vibration and temperature detection means 124) and controls drum drive motor 108. The control means 127 sets a vibration threshold corresponding to the rotation speed based on the vibration detection result from the vibration detection means, and performs imbalance judgment based on the vibration threshold, and corrects the vibration threshold based on the temperature detection result from the temperature detection means.

[0060] As a result, the drum-type washing machine 100 controls the motor's rotation speed according to the temperature based on the vibration detection means and temperature detection means through data communication between the vibration detection means and the temperature detection means, thereby suppressing vibration and noise appropriate for each operating environment, including high, normal, and low temperatures. At high temperatures, the damping force of the four dampers decreases, maximizing the vibration of the rotating drum 101. Temperature compensation is performed accordingly, thereby suppressing vibration and noise behavior specific to high temperatures. Furthermore, at low temperatures, the height of the belt 107 increases, increasing the transmission of vibration from the rotating drum 101 to the washing machine housing 110. This also reduces the rubber damping performance of the mounting legs 117 attached to the floor, maximizing the vibration of the washing machine housing 110. Temperature compensation is performed accordingly, thereby suppressing vibration and noise behavior specific to low temperatures. Therefore, vibration and noise can be suppressed at any operating temperature of the washing machine.

[0061] As in the present embodiment, the drum type washing machine 100 has the vibration detection means and the temperature detection means. The control means may be on a single printed circuit board and may be configured by a microcomputer.

[0062] This allows the drum-type washing machine 100 to know the temperature characteristics of the vibration sensor itself, enabling it to set a threshold value accordingly. This allows vibration detection and temperature detection to be performed with an inexpensive configuration that is less susceptible to noise.

[0063] As in this embodiment, drum-type washing machine 100 may have water tub unit 109 formed by water tub 102, rotating drum 101, rotating shaft 105, and drum drive motor 108, and vibration detection means and temperature detection means may be attached to water tub unit 109.

[0064] As a result, since the vibration detection means and the temperature detection means are attached to water tub unit 109, which can detect vibrations with high accuracy, it is less susceptible to the influence of temperature from inside the device, and temperature detection can be performed with higher accuracy. Therefore, temperature correction can be performed in response to vibrations, taking into account the temperature characteristics of drum type washing machine 100.

[0065] As in this embodiment, the drum type washing machine 100 may use a MEMS (Micro Electro Mechanical Systems) sensor having both a vibration detection function and a temperature detection function as the vibration detection means and the temperature detection means.

[0066] As a result, vibration detection and temperature detection are packaged as MEMS sensors, allowing for miniaturization on the board and obtaining two pieces of information, vibration and temperature, through serial data communication alone. This reduces the number of microcomputer ports and simplifies software processing. Therefore, there is no need to add electronic components such as thermistors and resistors, which would be necessary if vibration detection means and temperature detection means were provided independently.

[0067] (Other embodiments) As described above, the first embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the first and second embodiments to create new embodiments.

[0068] Therefore, other embodiments will be exemplified below.

[0069] In the first embodiment, a drum-type washing machine has been described as an example of a washing machine. The washing machine is not limited to a drum-type washing machine as long as it generates vibrations as the rotating drum rotates. The washing machine may also be a vertical washing machine.

[0070] In the first embodiment, the vibration detection unit also functions as a temperature detection unit, but it is also possible to use a configuration in which multiple vibration detection units or multiple temperature detection units are attached to various locations and the detection information is combined to suppress vibration and noise in all steps of the washing, rinsing, and spin-drying processes.

[0071] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0072] The present disclosure is applicable to washing machines in which vibrations occur as the rotating drum rotates, specifically to drum-type washing machines, vertical washing machines, and the like. [Explanation of symbols]

[0073] 100 Drum type washing machine (washing machine) 101 Rotating drum (inner tank) 102 Aquarium 103 Bearing case 104 Bearings 105 Rotational Axis 106 Drum pulley (pulley) 107 Belt 108 Drum drive motor (motor) 109 Aquarium Unit 110 Washing machine housing (housing) 111 Suspension 112 Drainage route 113 Base 114 Housing connection part 115 First Damper (Damper) 116 Second Damper (Damper) 117 Installation legs 118 Water tank connection part 119 Aquarium Cover 120 Vibration and temperature detection device 122 Controller Cover 123 Water level detection means 124 Vibration and temperature detection means 125 Printed Circuit Board 126 Lead Wire 127 Control Means

Claims

1. The housing and a water tank that is elastically supported by a suspension from above inside the housing and is connected to the inside of the housing at its bottom by a damper, thereby being vibration-proof; an inner tank rotatably disposed inside the water tank; a rotation shaft fixed to the bottom of the inner tank and protruding from the rear bottom of the water tank; a pulley provided at a rear end of the rotary shaft; a motor that rotates the rotation shaft via a belt that is wound around the pulley, thereby driving the inner tank to rotate; vibration detection means for detecting vibration; a temperature detection means for detecting a temperature; a control means for inputting information from the vibration detection means and the temperature detection means and controlling the motor; the control means sets a vibration threshold value corresponding to the number of rotations based on the vibration detection result from the vibration detection means, and performs unbalance determination based on the vibration threshold value; The vibration threshold is corrected based on the temperature detection result from the temperature detection means. washing machine.

2. the vibration detection means and the temperature detection means are on the same printed wiring board; The control means is configured by a microcomputer. The washing machine according to claim 1.

3. the water tank, the inner tank, the rotating shaft, and the motor constitute a water tank unit; The vibration detection means and the temperature detection means are attached to the water tank unit. The washing machine according to claim 1 or 2.

4. The vibration detection means and the temperature detection means use MEMS (Micro Electro Mechanical Systems) sensors having both a vibration detection function and a temperature detection function. The washing machine according to claim 1 or 2.

5. The vibration detection means and the temperature detection means use MEMS (Micro Electro Mechanical Systems) sensors having both a vibration detection function and a temperature detection function. The washing machine according to claim 3.

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