CN116324079A

CN116324079A - Washing drier

Info

Publication number: CN116324079A
Application number: CN202180068306.9A
Authority: CN
Inventors: 吉野知也; 渡边光; 北慎勇希; 曾我丈; 飞田达成; 高田健太郎; 林炳
Original assignee: Hitachi Global Life Solutions Inc
Current assignee: Hitachi Global Life Solutions Inc
Priority date: 2020-10-23
Filing date: 2021-07-29
Publication date: 2023-06-23
Also published as: JP7377184B2; JP2022068944A; WO2022085266A1

Abstract

The invention provides a washing dryer which can output high-speed wind at a maximum current value without demagnetizing and can realize a drying operation for inhibiting insufficient drying or overdrying. The washing dryer of the invention comprises: a rotary tub (3) for accommodating laundry; an air supply fan for supplying dry air into the rotary barrel (3); a blower fan motor (11) for driving the blower fan; a current detection unit for detecting a current flowing through the blower fan motor (11); and a control device (100) for controlling the fan motor (11) for air supply. When the current detected by the current detection unit is equal to or greater than a predetermined threshold value, the control device (100) rotates the blower fan motor (11) at a rotation speed fixed at a time point exceeding the threshold value.

Description

Washing drier

Technical Field

The present invention relates to a washing dryer for washing laundry.

Background

Washing and drying machines are known, comprising: an air supply fan for supplying air into the washing tub in the drying process; a fan motor for driving the air supply fan; and a control device for controlling the fan motor for air supply.

Patent document 1 is known as a washing and drying machine provided with the control device. Patent document 1 discloses that: "to circulate and thereby dry in the following manner: the air supply fan is operated, hot air is blown into the washing tub from the hot air blowing opening by the heater, the clothes are heated to evaporate water, the air which becomes high temperature and high humidity is sucked into the drying pipe, the low temperature air which becomes dry by cooling and dehumidifying by the cooling water flowing down by the dehumidifying mechanism is heated again by the heater, and the air is blown into the washing tub. And is configured as ' a hot air blowing port for blowing hot air from a drying mechanism arranged at the upper part of the washing tub ', and blowing high-speed hot air with the product of the air quantity and the air speed of more than 1.6 (N) to the clothes in the washing tub, so as to smooth wrinkles of the clothes '.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2020-10863

Disclosure of Invention

Technical problem to be solved by the invention

As shown in patent document 1, when high-speed hot air is blown to laundry in a washing tub, the rotational speed of the blower fan motor gradually increases, and the current flowing through the blower fan motor also increases.

In this way, in the drying step, when the rotational speed is gradually increased, the temperature characteristics in the washing tub may change, and the drying may become insufficient or the drying may become overdry and the operation may end.

The invention aims to provide a washing and drying machine which can output high-speed wind with the maximum current value without demagnetizing and inhibit insufficient drying or overdrying.

Means for solving the problems

In order to achieve the above object, the washing and drying machine of the present invention comprises: an inner tub for accommodating washings; an air supply fan for conveying dry air into the inner barrel; a fan motor for driving the air supply fan; a current detection unit for detecting a current flowing through the blower fan motor; and a control unit that controls the blower fan motor, wherein the control unit rotates the blower fan motor at a rotation speed fixed at a time point exceeding a predetermined threshold value when the current detected by the current detection unit is equal to or greater than the predetermined threshold value.

Effects of the invention

According to the present invention, it is possible to provide a washing and drying machine capable of performing a drying operation of outputting high-speed air at a maximum current value without demagnetization and suppressing insufficient drying or overdrying.

Drawings

Fig. 1 is a diagram showing a configuration example of a washing and drying machine according to an embodiment of the present invention.

Fig. 2 is a diagram showing a configuration example of a control device in the washing and drying machine.

Fig. 3 is a diagram showing a control flow of the drying operation of the control device.

Fig. 4 is a diagram showing a relationship between the rotational speed of the blower fan motor and the current value at the time of the drying operation.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the washing dryer S is described as an example of a vertical washing dryer, but the fan 22 may be applied to a drum-type washing dryer or other equipment in which a drum rotates about a substantially horizontal axis and an inlet and outlet for laundry is formed on the front surface side.

Fig. 1 shows a configuration example of a washing and drying machine according to an embodiment of the present invention. Fig. 1 is a right side cross-sectional view showing a washer-dryer S equipped with a fan 22. Right and left are set as seen from the use side (front side) toward the washing dryer S.

As shown in fig. 1, the washing and drying machine S includes an outer frame 1 of a casing, an outer tub 2 storing washing water, a rotary tub (inner tub, washing tub) 3 storing laundry, a driving motor 10 as a main motor driving the rotary tub, and a blower fan 22. The fan 22 of the present embodiment has a function of generating drying air in the drying process of the washing and drying machine S.

The outer tub 2 is made of, for example, synthetic resin, and is supported in a vibration-proof manner in the center of the outer frame 1 and accommodated in the outer frame 1.

The spin basket 3 is a washing and dehydrating basket for storing washed, dehydrated and dried laundry. The rotary tub 3 is provided at the inner center of the outer tub 2. The rotary tub 3 has a rotation axis in the vertical direction, and is rotatably supported in the outer tub 2.

At the bottom of the rotary tub 3, a stirring blade 4 for stirring the washing water to perform washing and rinsing is rotatably provided. The stirring blade 4 repeatedly performs forward/reverse rotation during the washing operation and the drying operation. The stirring blade 4 rotates at a high speed together with the rotary tub 3 and the laundry in the rotary tub 3 during the dewatering operation, and dewaters the water contained in the laundry by centrifugal force.

The driving motor 10 is provided in the outer frame 1 and rotationally drives the stirring blade 4 and the rotary tub 3. The driving motor 10 uses, for example, a DC brushless motor. The DC brushless motor is controlled by vector control. The driving motor 10 may directly drive the stirring blade 4 and the rotary tub 3, or may drive the stirring blade and the rotary tub by using a speed reduction mechanism such as a belt.

An openable and closable outer cover 5 is provided at an upper portion of the outer frame 1. The rear side of the cover 5 is supported by a top cover 6 provided on the upper portion of the outer frame 1. An inner lid 34 is provided under the outer lid 5 at the upper part of the outer tub 2 so as to be openable and closable about a rear axis. The washing is taken out and put in with respect to the rotary tub 3 by opening the outer lid 5 and the inner lid 34.

Inside the outer frame 1, a water supply unit 7 is provided at the rear side of the outer cover 5 of the top cover 6. The water supply unit 7 has a water supply tank (not shown) having a plurality of water paths therein. The water supply unit 7 injects tap water or bath water supplied from a water supply hose connection port 8 into the inside of the outer tub 2, and the water supply hose connection port 8 protrudes upward from the top cover 6. A detergent/care agent dispensing device 35 is provided on the front side of the top cover 6. The detergent and the care agent are injected between the outer tub 2 and the rotary tub 3 through the injection hose 36.

The washing dryer S further includes a drying mechanism 9 for drying the laundry. The drying means 9 circulates air for drying to dry the laundry in the rotary tub 3, and dehumidifies the laundry. Most of the drying mechanism 9 is occupied by the drying air circulation passage. The drying air circulation passage includes: a bottom circulation path 20 communicating with the bottom of the outer tub 2; and a vertical dehumidification passage 21 extending upward from the bottom circulation passage 20.

The suction side of the lower portion of the fan 22 is connected to the upper end portion of the vertical dehumidification passage 21. A dry filter 45 is disposed between the fan 22 and the vertical channel 21 for dehumidification so that foreign matter does not flow into the fan 22. The discharge side of the front portion of the blower 22 is connected to and communicates with the return connection circulation passage 25. The fan 22 includes a fan for air blowing (blower fan) and a blower fan motor (blower motor) 11 for driving the fan.

The return connection circulation path 25 communicates with the upper portion of the outer tub 2 via an upper bellows 23 of a part thereof. The bottom circulation path 20 communicates with the bottom of the outer tub 2 via a lower bellows 26 of a part thereof.

The lower bellows 26 is connected to a bottom recess 31 of the outer tub 2. The bottom recess 31 communicates with a wash water drain path 42 for drain and a wash water circulation path 43 for circulation via a lower communication pipe 41. The wash water drain line 42 is provided with a normally closed drain valve 44 that opens only when draining.

The drain valve 44 is closed during the washing operation and the drying operation. The drain valve 44 is opened when draining the washing water, and the washing water or rinse water stored in the outer tub 2 is discharged from the washing water drain passage 42 to the outside (outside) of the washing dryer S. The washing water circulation path 43 is provided with a foreign matter removal catcher 32 for removing a thread head and the like.

The washing water circulation water path 43 is connected to the washing water circulation water vertical path 46. The washing water circulating water path 46 extends upward along the outer surface of the outer tub 2 to the upper side of the rotary tub 3, and communicates with the washing thread end removing device 33 provided at the upper side of the rotary tub 3.

The washing water or rinsing water stored in the outer tub 2 flows through the washing water circulating water passage 46, and is injected from the washing thread end removing device 33 into the rotary tub 3 so as to be dispersed therein. Since the washing or rinsing is performed while the water injection is continuously performed, the washing or rinsing can be performed with a small amount of water.

The washing and drying machine S has a water level sensor 47 for detecting the water level of the washing water or the rinsing water stored in the outer tub 2. An air catcher 50 is provided near the bottom of the outer tub 2. An air tube 49 is connected in communication with the air catcher 50. The water level sensor 47 is connected to the upper end of the air pipe 49 in communication therewith.

The washer-dryer S of fig. 1 includes a control device 100 as a control unit, and an example thereof is shown in fig. 2. The control device 100 is configured by using a microcomputer CPU, power supply units PM1 and PM2, and a power supply unit cooling fan 103 as main components, and the power supply units PM1 and PM2 convert power supply to direct current of appropriate values and supply power to a drive motor (main motor) 10 and a blower fan motor (blower motor) 11, respectively. Further, power is supplied to the motor of the power module cooling fan 103.

The microcomputer CPU obtains signals from and supplies control signals to the respective parts in order to appropriately control the operation processing steps in the washing and drying machine S. In fig. 2, the relationship between the power supply units PM1 and PM2 and the power supply unit cooling fan 103 is described.

Based on fig. 2, the microcomputer CPU internally generates an instruction such as a rotational speed instruction value, converts the generated rotational speed instruction value into a current instruction value, gives a control signal Sg1 (instruction value) to the power module PM1, gives a control signal Sg3 (instruction value) to the power module PM2, and gives a control signal Sg2 (instruction value) to the power module cooling fan 103. Further, the microcomputer CPU acquires temperature signals Sg4, sg5 detected by

thermistors

111, 112 provided in the power supply modules PM1, PM 2.

Fig. 3 shows an example of a control flow of the blower fan motor 11 in the drying process in the control device 100. The flow from START to END in fig. 3 is referred to as an update flow.

In this control device 100, in step S1, regarding the rotational speed of the blower fan motor 11 (hereinafter referred to as a fan rotational speed), a current flowing through the blower fan motor 11 is detected by a current detection unit (such as a shunt resistor), and it is determined whether or not the fan rotational speed estimated by a rotational speed estimation unit based on the detected current estimated rotational speed is equal to or greater than a predetermined threshold (for example, 23000 rpm). If the fan rotation speed is equal to or higher than the threshold value (Y), the routine proceeds to step S2. If the fan rotation speed is smaller than the threshold value (N), the process ends. The rotational speed estimating unit may detect the rotational speed by a sensor that detects the rotational speed. Here, the threshold value is set to the lowest rotational speed that can be set to a satisfactory degree of completion of drying.

Then, the process proceeds to step S2, and step S3 is performed by skipping step S2 only initially. In the following, a control flow after the second time when the command value of the rotation speed is updated will be described.

The command value (voltage command) of the fan rotation speed is sequentially outputted from the microcomputer CPU and updated.

In step S2, when a predetermined time, for example, 5 seconds has elapsed since the update of the command value of the fan rotation speed in the first update flow, and the update of the rotation speed has not been stopped (before the update is completed) (Y), the flow proceeds to step S3. If the period (N) is not satisfied, the process ends.

In step S3, the current detecting unit detects a current (hereinafter referred to as a fan current) flowing through the blower fan motor 11 for a predetermined period of time, and determines whether or not the fan current is equal to or greater than a predetermined threshold (for example, 7 a). Wherein the threshold value is a value set in consideration of a maximum current value without demagnetization. When the threshold value is not less than the threshold value (in the case of Y), the update of the fan rotation speed is stopped, the value is fixed (step S4), and the process proceeds to step S4. If the rotation speed is smaller than the threshold value (N), the microcomputer CPU outputs a value obtained by adding a predetermined value, for example, 200 rpm, to the command value of the fan rotation speed as the command value of the rotation speed (step S5).

Next, in step S6, it is determined whether or not the command value of the fan rotation speed is greater than a predetermined upper limit value (for example, 25800 rpm). The upper limit value is set to a value of the rotational speed at which the drying completion degree is good. When the number of rotations is larger than the upper limit value, the microcomputer CPU limits the rotation speed of the fan so that the command value of the rotation speed of the fan becomes the upper limit value (step S7), and then stops updating the rotation speed of the fan (step S8). That is, the fan rotation speed is fixed at the upper limit value.

Fig. 4 shows a relationship between the rotational speed of the blower fan motor 11 and the current value at the time of the drying operation when the control flow of fig. 3 is performed.

As shown in fig. 4 (a), when the fan is driven at a normal voltage and the load of the blower fan is small at normal temperature, that is, from the start of the drying operation, the fan current does not exceed a predetermined threshold value, and therefore the fan rotation speed is fixed at a predetermined upper limit value and the operation is performed at the fixed upper limit value. As shown in fig. 4 (b), since the fan current exceeds the predetermined threshold value when the fan is driven at the normal voltage and in the low temperature state, that is, when the load of the blower fan is large at the start of the drying operation, the fan is operated at the fixed fan rotation speed at the time when the fan current exceeds the predetermined threshold value. The same applies to the case where the fan is driven at a low voltage and at a normal temperature, that is, the fan current is large from the start of the drying operation.

As described above, since the current flowing through the blower fan motor 11 is directly detected, the control can be performed without being affected by the body unevenness such as the load and the pressure loss of the blower fan, and the control can be performed with the fan rotation speed fixed at the time when the detected fan current exceeds the threshold value, and the operation can be performed at the maximum rotation speed without being affected by the power supply voltage and the air temperature in the inner tub. Since the rotational speed is always a constant value, the drying detection based on the thermistor temperature difference (the difference between the temperature in the inner tub after the rise and the temperature in the inner tub at the time of the start of the drying operation) can be accurately performed, and the drying operation can be completed at a correct time.

Description of the reference numerals

3 … … rotary barrel, 10 … … driving motor, 11 … … fan motor for air supply, 100 … … control device, S … … washing drier, CPU … … microcomputer, PM1, PM2 … … power supply assembly.

Claims

1. A washer-dryer, comprising:

an inner tub for accommodating washings;

an air supply fan capable of conveying dry air into the inner barrel;

a fan motor for driving the air supply fan;

a current detection unit for detecting a current flowing through the blower fan motor; and

a control unit for controlling the fan motor for air supply,

the control unit rotates the blower fan motor at a rotation speed fixed at a time point exceeding a predetermined threshold value when the current detected by the current detection unit is equal to or greater than the predetermined threshold value.

2. The washer-dryer as recited in claim 1 wherein:

the control unit increases the rotation speed of the blower fan motor to a predetermined upper limit value when the current detected by the current detection unit is smaller than a predetermined threshold value, and fixes the blower fan motor to the upper limit value when the rotation speed reaches the upper limit value.

3. A washer-dryer as claimed in claim 2, wherein:

the control unit adds a predetermined value to the rotation speed command value when the current detected by the current detection unit is smaller than a predetermined threshold value.