JP2019130197A - Washing machine - Google Patents

Abstract

【Task】
In the case of high humidity, the temperature around the potting material is reduced, and the progress of hydrolysis of the potting material is reduced to provide a highly reliable washing machine.
[Solution]
When the humidity detected by the humidity sensor is equal to or higher than a preset humidity threshold, if the temperature detected by the temperature sensor is equal to or higher than a preset temperature threshold, the motor speed of the washing tub is decreased. Thus, by reducing the heat generation of the motor and the heat generation of the motor drive element in the control device, the progress of hydrolysis is suppressed by lowering the ambient temperature of the potting material in the control device.
[Selection] Figure 5

Description

  The present invention relates to a washing machine.

  Washing machines used in general households are often placed in high-humidity environments such as in the vicinity of bathrooms, in addition to being electrical appliances that use water. For this reason, it is common to perform a moisture-proof treatment on a control board on which electronic components for controlling the operation of a motor or the like mounted on a washing machine are mounted. As an example of the moisture-proof treatment, there is potting resin processing, the control board is built in the control board case, and a potting material is injected into the control board case and cured to form a control device integrated with the control board. Improve electrical insulation and waterproof function of parts. As the above-mentioned potting material, for example, an inexpensive urethane resin is often used and is generally known.

  However, the urethane resin generally used as a potting material is a material that undergoes hydrolysis. It is also known that the higher the humidity and temperature, the faster the hydrolysis proceeds. As the hydrolysis proceeds, there is a possibility that the insulation performance of the control device is lowered, leading to a failure of the control device and finally a failure of the washing machine. That is, when using a potting material, it is originally desirable to avoid high temperature and high humidity.

  As a prior art in this technical field, there is, for example, Japanese Patent No. 3820711. In this document, there is a description to prevent deterioration of the potting agent due to hydrolysis. “The controller's protective case is filled with a potting material made of urethane resin, etc. Construct and attach the protective case integrated controller to the washing machine body with the front side inclined downward, and provide a drain opening hole on the lower side of the protective case that communicates with the surface of the potting material In addition, a concave running water guide is integrally formed extending from the lower end surface of the drain hole opening hole in the direction of draining, and the tip of the concave running water guide is a process of filling the potting material in the protective case. The potting material has a surface above the lower end surface of the drain opening hole. , And filled in the protective case so as to be less than or equal to the tip of the concave running water guide '', the water adhering to the surface of the potting material from the tip of the concave running water guide, It is described that the liquid is dropped in the front lower direction of the washing machine main body to prevent deterioration due to hydrolysis of the potting material against water adhesion.

Japanese Patent No. 3820711

  Although the above-mentioned technique describes measures against water and high humidity by the treatment of water adhering to the surface of the potting material, it does not touch the problem with respect to temperature.

  In recent washing machines, a large capacity is required due to market demand, and a large-capacity washing tub is rotated. However, a large force is required to rotate a large-capacity washing tub. The torque is generated with a large current, or the washing tub is rotated using a large motor.

However, although a large capacity is required, increasing the outer shape of the washing machine leads to an increase in residential space, which is disadvantageous for the user. Therefore, the motor and the control device described above are installed in a small space in the washing machine. It is necessary to arrange.
In this case, the temperature of the ambient temperature rises due to the heat generated by the motor and the motor drive element mounted on the control device, and the hot air in a small space in the washing machine tends to stay, so that the potting material is also exposed to a high temperature state. Will be. In this case, the urethane resin, which is a potting material, accelerates the hydrolysis at high humidity and high temperature as described above.

  On the other hand, in the case of white goods such as washing machines, the product life must be ensured for a long period of time over multiple years. In other words, it is desirable to avoid high temperature and high humidity, but in recent washing machines, it is placed in a high humidity state such as near the bathroom, and the potting material in the control device is often exposed to a high temperature state. The environment is very severe.

  Therefore, an object of the present invention is to provide a highly reliable washing machine by reducing the temperature around the potting material in the case of high humidity and reducing the progress of hydrolysis of the potting material.

In order to solve the above-mentioned problems,
A laundry tub for loading laundry such as clothes, a motor for rotating the laundry tub, a control board having a function of controlling the rotational operation and the number of rotations of the motor, and a board for arranging the control board A control board case, a control apparatus in which urethane resin is injected into the control board case for the purpose of moisture prevention of the control board, and a temperature detection apparatus (hereinafter, temperature sensor) capable of detecting the temperature in the vicinity of the control apparatus, In a washing machine equipped with a humidity detection device (hereinafter referred to as a humidity sensor) capable of detecting humidity in the vicinity of the control device, when the humidity detected by the humidity sensor is equal to or higher than a preset humidity threshold, the temperature sensor When the detected temperature is equal to or higher than a preset temperature threshold, the motor speed of the washing tub is decreased.

  By reducing the heat generation of the motor and the heat generation of the motor drive element in the control device by the above-described means, the ambient temperature of the potting material in the control device is reduced.

  According to the present invention, in the environmental conditions to which the potting material is exposed, it is avoided that the potting material is exposed to a high temperature state in a high humidity state, the progress of hydrolysis of the potting material is suppressed, and the reliability of the potted processing control device And can provide a high-quality washing machine.

It is an external view which shows the drum type washing-drying machine of an Example. It is a perspective view which cut | disconnects some housings | casings of a drum type washing-drying machine, and shows an internal structure. It is a side view which shows the internal structure of a drum type washing-drying machine. It is a figure regarding the control apparatus mounted in a washing machine. It is a flowchart which shows the procedure until it reduces motor rotation speed from the detected value of humidity and temperature. It is the figure which showed the detected value transition of a humidity sensor and a temperature sensor, and the rotation speed operating state of a motor.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, an example of a drum type washing and drying machine will be described.

  FIG. 1 is an external view of a drum type washing / drying machine 100 according to the embodiment. FIG. 2 is a perspective view in which a part of the housing is cut to show the internal structure, and FIG. 3 is a side view showing the internal structure.

  The drum-type washing / drying machine 100 of this embodiment includes a drum 3 that stores clothes, performs washing, dehydration, and drying, a motor 4 that rotates the drum 3, and a casing 1 that supports the drum 3. Here, the casing 1 constituting the outer shell is mounted on a base 1h, and includes left and right side plates 1a and 1b, a front cover 1c, a back cover 1d, a top cover 1e, and a lower front cover 1f. . The left and right side plates 1a and 1b are connected by a U-shaped upper reinforcing material (not shown), a front reinforcing material 37, and a rear reinforcing material (not shown), and a box-shaped housing including the base 1h. The body 1 is formed and has sufficient strength as a housing.

  Also, a door 9 that closes the slot for putting in and out the clothes is provided at the approximate center of the front cover 1c, and is supported by a hinge 9c provided on the front reinforcing member so as to be opened and closed. By pulling the door opening lever 9b, the lock mechanism (not shown) is released and the door is opened. When the door is pressed against the front cover 1c, the door is locked and closed. The front reinforcing member 37 has a circular opening for putting clothes in and out concentrically with an opening of the outer tub described later. The part which closes the outer tank opening part of the door 9 is made of the concave glass 9a so that it can endure the heat at the time of drying.

  Further, an operation panel 6 is provided on the right side of the upper front surface of the housing 1, and includes a power switch 11, operation switches 12 and 13, and a display 14.

  An operation display control device 61 is incorporated in the operation panel 6 and is detected by a function for controlling the motor 4 for rotating the washing tub, a humidity sensor, and a temperature sensor provided on the back side of the upper portion of the housing 1. It is electrically connected to a control device 38 provided with a control board for reading the humidity and temperature. A humidity sensor (not shown) for detecting humidity and a temperature sensor (not shown) for temperature detection are disposed near the control device 38.

  The drum 3 has a cylindrical shape that is rotatably supported. The drum 3 has a large number of through-holes for water flow and ventilation on the cylindrical surface and the back surface, and an opening 3a for putting clothes in and out on the front end surface. is there. A fluid balancer 3 c integrated with the drum 3 is provided at the front end of the drum 3 concentrically with the drum 3. A plurality of lifters 3b extending in the axial direction are provided on the inner surface of the cylindrical surface. When the drum 3 is rotated during washing and drying, the clothes are lifted along the cylindrical surface by the lifter 3b and centrifugal force so as to fall by gravity. Repeat the movement. The rotation center axis of the drum 3 is inclined so that the horizontal or opening 3a side becomes higher.

  Further, a cylindrical outer tub 2 for storing washing water is supported by the housing 1, includes a drum 3 on the same axis, opens on the front surface, and attaches a motor 4 to the outer center of the back surface. The rotating shaft 4 a of the motor 4 passes through the outer tub 2 and is coupled to the central portion on the back surface of the drum 3. An outer tub cover 2d is provided at the front opening of the outer tub 3 so that water can be stored in the outer tub. In the center of the front side of the outer tub cover 2d, there is an opening 2c for taking in and out clothing. The opening provided in the main opening 2c and the front reinforcing member 37 is connected by a rubber bellows 10. When the door 9 is closed, the glass 9a of the door 9 comes into contact with the lip of the bellows 10, and the outer tank 2 is sealed with water. When the door 9 is closed, the tip of the concave glass 9a closes the opening 2c of the outer tank cover 2d and the opening 3a of the drum 3. At this time, the axial position of the front end of the glass 9a and the front end of the drum 3 (the front end of the fluid balancer 3c) is substantially matched, and the laundry enters between the outer periphery of the glass 9a and the outer tub cover 2d. There is no consideration.

  A drain port 2b is provided at the lowermost part of the recess 2e, and a drain hose 26 is connected thereto. A circulation pump 22, a lint filter 23, and a drain valve 21 are provided in the middle of the drain hose 26. By closing the drain valve 21 and supplying water, water is stored in the outer tub 2, and the drain valve 21 is opened to open the outer tub. Drain the water in 2 out of the machine.

  A detergent container 7 is provided on the upper left side in the housing 1. As shown by a two-dot chain line in FIG. 1, an openable lid 7 a is opened to put detergents. The interior of the detergent container 7 is divided into a plurality of rooms so that powder detergent, liquid detergent, softener and the like can be separately charged.

  Components related to water supply such as a water supply electromagnetic valve 16, a bath water supply pump 17, and a water level sensor 18 are provided at the upper rear in the housing 1. The top cover 1e is provided with a water supply hose connection port 16a from a water tap and a water absorption hose connection port 17a for remaining hot water in the bath. The water supply electromagnetic valve 16, the bath water supply pump 17, and the detergent container 7 are connected by a water supply pipe (not shown). The detergent container 7 is connected to the outer tub 2 by a bellows hose 19, and tap water or water is supplied to the outer tub 2 via the detergent container 7 by opening the water supply electromagnetic valve 16 or operating the bath water supply pump 17. Supply bath water. Detergents put into the detergent container 7 by the user are supplied to the bottom of the outer tub 2 along the inner wall surface of the outer tub 2 together with water, and are undissolved powder detergent or high-concentration liquid detergent. The soft finish is applied directly to the clothes in the drum 3 so that discoloration and uneven color do not occur.

  The circulation pump 22 has two discharge ports, and the discharge port can be switched by switching the rotation direction of the circulation pump 22. Thereby, it is possible to disperse the detergent and the washing water on the laundry. When dissolving the detergent, the circulation pump 22 is rotated in the reverse direction. A small amount of water containing undissolved powder detergent supplied to the bottom of the outer tub 2 enters the circulation pump 22 from the drain port 2b through the lint filter 23, and passes through the circulating water hose 25b from the discharge port 22b. 2 circulates back to the bottom of the tank cover 2d. At this time, undissolved detergent and water are vigorously stirred in the circulation pump 22, and the detergent can be efficiently dissolved to produce a high-concentration detergent liquid. On the other hand, the water circulation pump 22 is rotated forward during washing. The washing water collected at the bottom of the outer tub 2 passes from the drain port 2b through the lint filter 23 to the circulation pump 22, and from the discharge port 22a through the circulation water hose 25a to the water spray port (not shown). To the drum 3 and circulates back to the bottom of the outer tub 2. The water spout is formed so that the water spray reaches from the back side to the front side of the drum 3 as indicated by an arrow S in FIG. Accordingly, since the washing water can be uniformly applied to the laundry, high washing power and rinsing performance can be obtained, and water can be saved because the washing water is circulated by the circulation pump 22 and repeatedly used.

  The lint filter 23 can be easily attached and detached by opening the door 1g provided on the lower front cover 1f.

  An air trap 24 is provided at the lowermost part of the rear part of the outer tub 9, and is connected to the water level sensor 18 by a tube 18a to detect the water level in the outer tub 2.

  The outer tub 2 is supported in a vibration-proof manner by a suspension 5 (consisting of a coil spring and a damper) whose lower side is fixed to the base 1h. Moreover, the upper side of the outer tank 2 is supported by an auxiliary spring (not shown) attached to the upper reinforcing member to prevent the outer tank 2 from falling in the front-rear direction.

  A drying duct 29 is installed vertically inside the back surface of the housing 1, and a lower portion of the duct is connected to an air inlet 2 a provided below the back surface of the outer tub 2 through a rubber bellows tube 29 a. A water-cooled dehumidifying mechanism (not shown) is built in the drying duct 29, and cooling water is supplied from the water supply electromagnetic valve 16 to the water-cooled dehumidifying mechanism. The cooling water flows down along the wall surface of the drying duct 29, enters the outer tub 2 from the intake port 2a, and is discharged from the drain port 2b.

  The upper part of the drying duct 29 is connected to the drying filter 8 installed at the upper right rear side in the housing 1. The lint from the air that has entered the drying filter 8 from the drying duct 29 is removed by the mesh filter of the drying filter 8. Cleaning of the dry filter 8 is performed by pulling the dry filter 8 upward as shown by a one-dot chain line in FIG. The drying filter 8 is connected to the intake duct 33, and the other end of the intake duct 33 is connected to the intake port of the blower unit 28.

  A means for blowing wind into the drum 3 is provided in the housing 1 at the upper right with respect to the rotation axis of the drum 3 when viewed from the door 9 side, and the drum 3 is rotated clockwise by the motor 4. While rotating counterclockwise, the clothes lifted by the rotation of the drum 3 are blown to dry. Here, the means for blowing the wind includes a blower unit 28, a heater A31 provided on the discharge side of the blower unit 28 to heat the wind, a hot air outlet 32 provided downstream of the heater A31, It is comprised with the air path which connects these.

  FIG. 4 is a diagram relating to a control device mounted on the washing machine. The control device 38 has a function of controlling the rotational operation and the rotational speed of the motor 4, and includes a temperature sensor for detecting the temperature and humidity in the vicinity of the control device, a control board for reading the detection value of the temperature sensor, A control board case for disposing the control board and a moisture-proof treatment by injecting urethane resin into the control board case for the purpose of moisture prevention of the control board.

  Next, regarding the motor rotation of the washing machine, the function of reducing the number of rotations using the humidity detection value and the temperature detection value will be described with reference to FIGS. FIG. 5 is a flowchart showing a procedure from the humidity and temperature detection values until the motor rotation speed is reduced. FIG. 6 is a diagram showing changes in detected values of the humidity sensor and the temperature sensor and the operating state of the rotational speed of the motor.

  After the washing process of the washing machine is started (step S201 in FIG. 5), the motor rotation process included in a part of the washing process is started (step S202 in FIG. 5). At this time, the motor rotation speed N is set to the rotation speed Na set in the process control with motor rotation (step S203 in FIG. 5), and the motor rotation is started (step S204 in FIG. 5).

  Next, the preset high humidity determination threshold Ha is compared with the humidity H detected by the humidity sensor, and the detected humidity H is larger than the high humidity determination threshold Ha, that is, the detected humidity H> high. When it is the humidity determination threshold Ha (Yes in step S205 in FIG. 5), it is determined that the humidity is high, and the process proceeds to a determination step as to whether or not the temperature is high (step S206 in FIG. 5).

  When the detected humidity H is a value equal to or lower than the high humidity determination threshold Ha, that is, when the detected humidity H ≦ the high humidity determination threshold Ha (No in step S205 in FIG. 5), it is determined that the humidity is low, and the motor The rotational speed is not reduced, and the process proceeds to step S208.

  Next, the preset high temperature determination threshold Ta is compared with the temperature T detected by the temperature sensor, and the detected temperature T is larger than the high temperature determination threshold Ta, that is, the detected temperature T> high. If it is the temperature determination threshold Ta (Yes in step S206 in FIG. 5), it is determined that the temperature is high, and the motor rotation speed is reduced by Nm, that is, the motor rotation speed N = Na−Nm (step S207 in FIG. 5). ) If the motor rotation process does not end on control (No in step S208 in FIG. 5), the process proceeds to step S205, and the washing process is continued.

  When the detected temperature T is a value equal to or lower than the high temperature determination threshold Ta, that is, when the detected temperature T ≦ the high temperature determination threshold Ta (No in step S206 in FIG. 5), it is determined that the temperature is low, and the motor The rotational speed is not reduced, and the process proceeds to step S208.

  The above steps S205 to S208 are continued until the motor rotation process is ended in control (Yes in step S208 in FIG. 5).

  In addition, an example of transition of detected values of the humidity sensor and the temperature sensor and an operation state of the rotational speed of the motor will be described using FIG.

  After the washing process of the washing machine is started (point A in FIG. 6), a process with motor rotation included in a part of the washing process is started. At this time, the motor rotation speed N is set to the rotation speed Na set in the process control with motor rotation, and the motor rotation is started (point B in FIG. 6).

  The humidity sensor is mainly affected by the environment where the washing machine is placed, but the temperature sensor is controlled by the heat generated by the motor and the motor drive element inside the controller when the washing machine motor rotates. Since the temperature around the apparatus rises, the temperature sensor disposed near the control apparatus also rises in temperature. Therefore, the temperature rise continues from point B where the motor is rotating to point D. At point C, the humidity detected by the humidity sensor exceeds the high humidity determination threshold value Ha, but since the detection temperature T detected by the temperature sensor is equal to or lower than the high temperature determination threshold value, the motor rotation speed is not reduced. Next, since the rotation of the motor is zero (stopped) at point D, the motor and the motor driving element are not heated, the temperature around the control device is lowered, and the temperature sensor detects the temperature. The rotation of the motor starts again at point E and rotates at the rotation speed N = Na, but the detected temperature T of the temperature sensor exceeds the high temperature determination threshold Ta at point F. At this time, the detected humidity H of the humidity sensor continues to exceed the lecturer determination threshold Ha. As described above, since the high temperature is determined during the high humidity determination, the motor rotation speed N is reduced by Nm, and the motor rotation speed N = Na−Nm.

  Thereby, when N = Na is continued, the temperature rise of the detected temperature of the temperature sensor that should have risen to the temperature T2, that is, the ambient temperature of the control device, can be suppressed to the temperature T1. Thereafter, the motor rotation speed N = Na−Nm is maintained, and the temperature rise is continuously suppressed.

  As described above, by reducing the heat generation of the motor and the heat generation of the motor drive element in the control device, it is possible to reduce the ambient temperature of the potting material in the control device, and in high environmental conditions to which the potting material is exposed. It is possible to avoid exposure to a high temperature state in a humidity state, suppress the progress of hydrolysis of the potting material, maintain the reliability of the potted processing control device, and provide a high-quality washing machine.

  As described above, the embodiments of the present invention have been described. However, the preset humidity threshold value has two or more threshold values, and a preset temperature threshold value is provided for each threshold value. If the temperature is equal to or higher than the temperature threshold, the motor speed can be reduced.

  For example, two humidity thresholds are provided, low humidity, medium humidity, and high humidity are divided into three categories, and a high temperature determination threshold is provided for each category, and the temperature rise of the control device is suppressed by the motor rotation speed reduction control described above. If it carries out, the suppression of the progress of hydrolysis of a potting material can also obtain a higher effect.

  Moreover, the temperature sensor mentioned above may be arrange | positioned on the control board in the control apparatus which carried out the potting process.

DESCRIPTION OF SYMBOLS 1 Case 2 Outer tank 3 Drum 4 Motor 6 Operation panel 9 Door 16 Water supply solenoid valve 22 Circulation pump 38 Control device 61 Operation display control device 101 Control board case 102 Control board 103 Motor drive element 104 Control microcomputer 105 Potting material

Claims (2)

A laundry tub for loading laundry such as clothes;
A motor for rotating the washing tub;
A control board having a function of controlling the rotational operation and the rotational speed of the motor;
A control board case for arranging the control board;
A control device in which urethane resin is injected into the control board case for the purpose of moisture prevention of the control board and is moisture-proofed,
A temperature detection device capable of detecting the temperature in the vicinity of the control device;
A humidity detection device capable of detecting the humidity in the vicinity of the control device,
When the humidity detected by the humidity detection device is equal to or higher than a preset humidity threshold value, the motor rotational speed is decreased when the temperature detected by the temperature detection device is equal to or higher than a preset temperature threshold value. A washing machine featuring.   The humidity threshold has two or more thresholds, a temperature threshold set in advance between each threshold is provided, and when the temperature threshold is equal to or higher than the preset temperature threshold, the motor rotation speed is reduced. The washing machine according to claim 1.

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