EP2966216A1

EP2966216A1 - Dehumidifier

Info

Publication number: EP2966216A1
Application number: EP14760701.4A
Authority: EP
Inventors: Toshiyuki YANAI; Noriyoshi Kabeta; Hideo Shibata; Yoshiyuki Fujita
Original assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Priority date: 2013-03-05
Filing date: 2014-02-13
Publication date: 2016-01-13
Also published as: TW201502447A; CN105026636B; WO2014136544A1; CN105026636A; TWI588423B; JP5999250B2; HK1211633A1; EP2966216A4; JPWO2014136544A1

Abstract

In a dehumidifier which performs clothes drying, there are problems such as a problem that evaluation information on a user being satisfied with a degree of dryness of washed clothes is not reflected on the operation control. In order to solve the problem, the dehumidifier includes a casing, a blowing fan that sucks indoor air into the casing and blows out the air, dehumidification means for removing moisture from the indoor air taken into the casing by the blowing fan and control means for controlling the blowing fan and the dehumidification means. The dehumidifier is configured such that the control means performs a clothes drying operation for drying clothes, and an operation time of the clothes drying operation is determined based on evaluation information on a degree of dryness of clothes in a clothes drying operation formerly performed.

Description

Technical Field

The present invention relates to a dehumidifier that removes moisture in a room, and more particularly to a dehumidifier having a function of drying laundry such as clothes to be dried hung in a room.

Background Art

Conventionally, there is a dehumidifier including: an inlet provided in a body; an evaporator and a condenser provided in the body; a sirocco fan that blows out dry air from an outlet provided in the body; an air direction plate rotatably provided in the outlet of the body for multidirectionally blowing out dry air; and a motor that rotationally drives the air direction plate, wherein the dry air dehumidified and heated by the evaporator and the condenser is blown out from the outlet into a room by a blower to efficiently dehumidify the room, and uniformly dry clothes when the dehumidifier is used for drying clothes (for example, see Patent Literature 1).

Citation List

Patent Literature

Patent Literature 1: Japanese Patent Laid-Open No. 7-139759 (Figure 1)

Summary of Invention

Technical Problem

However, the configuration described in Patent Literature 1 does not perform appropriate operation control of air blowing or dehumidification according to a humidity or a temperature around the dehumidifier, but has a problem in energy saving. Also, evaluation information on a user being satisfied with a degree of dryness of washed clothes is not reflected on the operation control.
The present invention solves the above described problems, and has an object to provide a dehumidifier that performs appropriate dehumidification control according to a user's usage pattern.

Means for Solving the Problems

In order to solve the above described problems, the dehumidifier includes a casing, a blowing fan that sucks indoor air into the casing and blows out the air, dehumidification means for removing moisture from the indoor air taken into the casing by the blowing fan and control means for controlling the blowing fan and the dehumidification means. The dehumidifier is configured such that the control means performs a clothes drying operation for drying clothes, and an operation time of the clothes drying operation is determined based on evaluation information on a degree of dryness of clothes in a clothes drying operation formerly performed.

Advantageous Effects of Invention

According to the present invention, a dehumidifier can be obtained capable of reflecting evaluation on a degree of dryness of clothes for every clothes drying performed, as evaluation information on an operation, and performing a clothes drying operation to suit to a preference of an individual user.

Brief Description of Drawings

[Figure 1] Figure 1 is a perspective view of an appearance of a dehumidifier according to Embodiment 1.
[Figure 2] Figure 2 is a schematic configuration diagram of an inner structure of the dehumidifier according to Embodiment 1.
[Figure 3] Figure 3 is a schematic perspective view of air direction variable means.
[Figure 4] Figure 4 is a control block diagram of the dehumidifier according to Embodiment 1.
[Figure 5] Figure 5 is a flowchart of an operation during a clothes drying operation of the dehumidifier according to Embodiment 1.
[Figure 6] Figure 6 is a table showing target degrees of dryness and coefficients of the dehumidifier according to Embodiment 1.

Description of Embodiments

Embodiment

1

Now, with reference to the drawings, Embodiment 1 of the present invention will be described.
Figure 1 is a perspective view of an appearance of a dehumidifier according to this embodiment. Figure 2 is a schematic configuration diagram of an inner structure of the dehumidifier according to this embodiment. Figure 3 is a schematic perspective view of air direction variable means. Figure 4 is a control block diagram of the dehumidifier according to this embodiment. Figure 5 is a flowchart of an operation during a clothes drying operation of the dehumidifier according to this embodiment.
With reference to Figure 1, an outer shell of a dehumidifier J is constituted by a self-supporting dehumidifier casing 100 (hereinafter referred to as a casing 100).
The casing 100 has an inlet 101 for taking in indoor air A, and an outlet 103 for discharging dry air B from which moisture is removed from the casing 100 into a room. The casing 100 includes therein a water storage tank 102 that stores moisture removed from air taken into the inlet 101.
The inlet 101 opens in a back surface of the casing 100, and a filter for preventing dust from entering the casing 100 is provided in the opening.
Air direction variable means 1 capable of varying an air direction of the dry air B is provided in the outlet 103. The air direction variable means 1 includes a vertical louver 1a capable of varying a vertical air direction, and a horizontal louver 1b capable of varying a horizontal air direction.
The water storage tank 102 is mounted removably from the casing 100.
Further, with reference to Figure 2, the dehumidifier J includes therein a blowing fan 2 that generates an airflow for sucking the indoor air A from the inlet 101 and discharging the dry air B from the outlet 103, a fan motor 2a for rotating the blowing fan 2, a temperature sensor 3 (temperature detection means) for detecting a temperature of the indoor air A sucked from the inlet 101, a humidity sensor 4 (humidity detection means) for detecting a humidity of the indoor air A, dehumidification means 5 for removing moisture contained in the indoor air A and generating the dry air B, a vertically variable motor 1c capable of vertically varying the vertical louver 1a, a horizontally variable motor 1d capable of horizontally varying the horizontal louver 1b, an infrared sensor 6 as surface temperature detection means, and a control circuit 7 as control means for controlling each portion.
The dehumidification means 5 is located in an air trunk from the inlet 101 to the outlet 103, and removes and condenses moisture in air. An example of a system used in the dehumidification means 5 includes a system in which a heat pump circuit is configured to condense moisture in air using an evaporator, or a desiccant system in which moisture in air removed by an absorbent is condensed using a heat exchanger.
The moisture removed from the indoor air A by the dehumidification means 5 is stored as condensed water C in the water storage tank 102, and the air from which the moisture is removed is the dry air B.
Next, with reference to Figure 3, the vertical louver 1a that constitutes the air direction variable means 1 has a rectangular opening extending widthwise of the casing 100, and is vertically variable substantially around a rotary shaft of the vertically variable motor 1c described above.
Thus, an air direction is variable vertically (upward and downward).
The horizontal louvers 1b are placed at regular intervals in the vertical louver 1a, and horizontally variably journaled on a back opposite to an opening of the vertical louver 1a so as to be operated by driving the horizontally variable motor 1d described above.
Thus, an air direction is variable horizontally (leftward and rightward).
The infrared sensor 6 is mounted to one surface of the horizontal louver 1b substantially at a middle placed in the vertical louver 1a.
Thus, a range of a surface temperature detected by the infrared sensor 6 is substantially the same as the direction of the dry air B variable by the air direction variable means 1. Specifically, the infrared sensor 6 can detect a surface temperature of the entire region within a range to which the air direction variable means 1 can blow air.
The infrared sensor 6 uses, for example, an effect of a thermoelectromotive force, and includes an infrared absorbing film 6a that receives heat (infrared) emitted from a surface of a predetermined region, and a thermistor 6b that detects a temperature of the infrared absorbing film 6a (see Figure 3).
The infrared sensor 6 converts a difference between a temperature of a thermal portion (hot junction) of the infrared absorbing film 6a that absorbs emitted heat and is thus increased in temperature and a temperature of the infrared absorbing film 6a (cold junction) detected by the thermistor 6b into an electric signal such as a voltage, and inputs the electric signal to a control circuit 7 described below. A surface temperature of a predetermined region can be determined from a magnitude of the electric signal.
When the control circuit 7 detects that a dehumidification mode is selected by a switch operation of an operation portion (not shown), the control circuit 7 drives the air direction variable means 1 to allow air blowing from the outlet 103, drives the fan motor 2a to rotate the blowing fan 2, and drives the dehumidification means 5 so as to provide an optimum humidity in the room.
Also, the control circuit 7 drives the vertically variable motor 1c and the horizontally variable motor 1d of the air direction variable means 1 so as to blow air toward a desired region in the room.
Thus, the indoor air A is taken from the inlet 101 into the dehumidifier casing 100, the temperature sensor 3 and the humidity sensor 4 detect a temperature and a humidity in the room, respectively, and then the dehumidification means 5 dehumidifies the indoor air A into the dry air B, which is blown out from the outlet 103 into the room.
Next, with reference to Figure 4, the control circuit 7 and various sensors and electronic components connected to the control circuit will be described.
The control circuit 7 controls an operation of the entire dehumidifier J by inputs from various sensors and switches and predetermined algorithms, and includes an input circuit 7a, an output circuit 7b, a CPU 7c, a storage portion 7d, and a timer portion 7e as operation time measuring means for measuring an operation time from a start of the operation.
Also, the storage portion 7d stores the algorithms described above for controlling the components of the dehumidifier J. The algorithms include an operation control program for determining operation control based on inputs from various sensors or switches, and an operation time determination program for determining a subsequent operation time based on detection signals from the temperature sensor 9 and the humidity sensor 10 and an output of the timer portion.
To the control circuit 7 thus configured, various sensors and switches such as the operation switch 8 for turning on/off the operation of the dehumidifier J, the temperature sensor 9, the humidity sensor 10, the infrared sensor 6, and a dryness evaluation switch 11 as evaluation input means for the user to input evaluation on a degree of dryness of laundry are connected through the input circuit 7a.
The dryness evaluation switch 11 may be replaced by the operation switch 8 as in a later description of an operation (step S11 and subsequent steps). For example, evaluation on the degree of dryness may be estimated from timing when the user operates the operation switch 8.
Further, to the control circuit 7, electric components such as a display portion 12 for indicating a state of the dehumidifier, the dehumidification device 5, the fan motor 2a, the vertically variable motor 1c, and the horizontally variable motor 1d are connected through the output circuit 7b.
Next, with reference to Figure 5, the operation during the clothes drying operation of the dehumidifier J with the components configured as described above will be described.
In the description below, time measurement, humidity measurement, and temperature measurement are performed by the timer portion 7e, the humidity sensor 10, and the temperature sensor 9, respectively, described above, and various arithmetic processings are performed by the control circuit 7.
In step S1, when the control circuit 7 of the dehumidifier detects that the clothes drying operation is started, the control circuit 7 starts driving components required for the dehumidifying operation such as the dehumidification device 5 and the fan motor 2a, and the process moves to step S2. In step S2, measurement of an operation time t is started, and the process moves to step S3.
In step S3, during a preset time (core time), the dehumidifying operation is continued, and when the core time is reached, the process moves to step S4. In this embodiment, the core time is set to 70 minutes. The core time is a time for drying clothes to some extent before moving to a next step.
In step S4, after a lapse of the core time, an atmospheric relative humidity detected by the humidity sensor 10 is determined at predetermined time intervals (every 10 minutes in this embodiment), and humidity detection is continued until a preset relative humidity (50% or lower in this example) is detected (step S5). Then, when the preset relative humidity is reached, the process moves to step S6.
In step S6, an operation time t1 from the start of the operation when the atmospheric relative humidity (a humidity of the indoor air) becomes less than 50% and a detection temperature T as an atmospheric temperature (a temperature of the indoor air) detected by the temperature sensor 9 are obtained, and the process moves to step S7. Then, in step S7, a product of the detection temperature T and the operation time t1 is calculated, and the process moves to step S8.
Then, in step S8, a coefficient D is calculated, and the process moves to step S9.
The coefficient D is one of variables that change a drying operation time of the clothes drying operation, and calculated by an expression below obtained by experiment: $D = a \times {(T \times t 1)}^{\land} b (ʺ \land ʺ refers to a power) .$
With reference to Figure 6, coefficients a and b are set for each application rank Dx.
As the application ranks Dx, D1 to D5 are set according to target degrees of dryness, and each application rank has corresponding coefficients a and b, which are obtained by processes in step S 11 and subsequent steps described later in former operations and applied.
In this embodiment, five application ranks Dx are set. However, if the operation time of the clothes drying operation needs to be more finely changed, five or more application ranks may be set, and if there is no need for finely changing the operation time, less than five application ranks may be set.
In the first operation, an initial value D3 is set. Target degrees of dryness of higher values show higher degrees of dryness. Specifically, in this example, D5 is a rank with the longest operation time, and D1 is a rank with the shortest operation time.
The coefficients a and b for each application rank Dx are stored in the storage portion 7d in the control circuit 7, and when the rank is increased or reduced by user's evaluation information described later, the coefficients a and b in an applied rank are read and used for calculation.
Then, in step S9, the coefficient D obtained in step S8 is used to calculate a remaining dehumidifying operation time Y by an expression obtained by experiment: $Y = t 1 \times (D - T / 100),$

the remaining dehumidifying operation time Y is determined, and the process moves to step S10.
Then, if the user does not stop the operation, the clothes drying operation is performed until the remaining dehumidifying operation time Y passes, but in step S10, it is determined whether the operation time reaches Z or not. The operation time Z is a time during which drying of laundry proceeds to some extent and is set by an experimental value. After the operation time Z, the user's evaluation on the degree of dryness of clothes is effective (evaluation on the degree of dryness of clothes is obtained from a user's usage pattern).
When the operation time reaches Z in step S10, the process moves to step S 11.
The processes in step S 11 and subsequent steps are effective after the lapse of the predetermined operation time Z. This is for excluding a stop of the operation due to an incorrect operation of the operation switch 8 or the like during the clothes drying operation from evaluation on the degree of dryness of clothes used for changing the application rank Dx performed in step S11 and subsequent steps. In this embodiment, Y is set to be larger than Z.
For example, with step S10, if the operation is stopped by an incorrect operation immediately after the start of the clothes drying operation, evaluation on the degree of dryness of clothes that are hardly dried can be excluded, thereby preventing incorrect determination and increasing accuracy of determination.
Then, step S11 and subsequent steps are flows of user's evaluation on the degree of dryness of clothes.
In this embodiment, the user's evaluation on the degree of dryness of clothes is estimated from timing when the user stops the operation, that is, timing when the user operates the operation switch 8.
In step S11, it is determined whether or not the user operates the operation switch to stop the operation before the lapse of the dehumidifying operation time Y.
Originally, through step S12 for determining whether or not the remaining dehumidifying operation time Y calculated in step 9 is reached, the clothes drying operation is finished in step S13.
However, if the user checks the degree of dryness of laundry before the lapse of the dehumidifying operation time Y, determines that there is no need for a further drying operation, and stops the operation before moving to step S12, the process moves to step S21.
The storage portion 7d has a determination count, which is increased and reduced according to the user's evaluation on the degree of dryness of clothes estimated as described above. An initial value of the determination count is 0.
In step S21, the determination count is reduced by one point, the result is stored in the storage portion 7d, and the process moves to step S22.
In step S22, it is determined whether an accumulated count number of the determination count is a predetermined number ("-2" in this embodiment) or smaller.
In this embodiment, it is determined whether the user stops the operation twice before the lapse of the remaining dehumidification time Y in this and former clothes drying operations. Specifically, it is determined whether the user has an intention to eliminate the need for the operation until the dehumidification time Y, and also incorrect determination due to an incorrect input or a prank by a person other than the user is prevented.
Then, the process moves to step S23, the application rank Dx described above is reduced by one to determine a rank applied to a next operation. Simultaneously, the determination count is reset.
As described above, the user stops the operation before the lapse of the remaining dehumidifying operation time Y, and thus the dehumidifying operation time Y is corrected to be reduced in subsequent operations.
In this embodiment, the accumulated count number of the determination count is "-2" in step S22, but the accumulated count number may be "-1" if the rank of the coefficient D is changeably set, or less than "-2" if the rank D is less changeably set.
When the operation is stopped before the remaining dehumidification time Y, the determination count is reduced by one point. However, the number of points to be reduced may be changed according to timing of the stop. For example, when the operation is earlier stopped, the number of points to be reduced may be larger, and when the operation is stopped closer to the dehumidification time Y, the number of points to be reduced may be smaller.
Next, in step S11, when the user does not stop the operation before the lapse of the remaining dehumidification time Y, it is determined in step 12 whether or not the time Y calculated in step S9 is reached.
In step S12, when an operation finish condition is satisfied (when the time Y has passed), the process moves to step S 13, and the clothes drying operation is once finished. Then, in step S14, an internal shift to a standby state occurs. The standby state refers to a state where dehumidification and air blowing are stopped.
When the operation finish condition is not satisfied (the time Y has not passed) in step S12, the process moves to step S11.
This standby state has a time limit, and it is determined in step S16 whether a predetermined time has passed. When the predetermined time has passed in the standby state, the process moves to step S17, and the operation is finished. This time limit is five hours in this embodiment.
It is determined in step S15 whether the user again pushes the operation switch 8 to start the clothes drying operation when the dehumidifier is in the standby state. From the user restarting the operation, it is estimated that the user checks the degree of dryness of laundry and determines that the drying operation is again required. When the operation is restarted before moving to step S 17, the process moves to step S31.
In step S31, the determination count is increased by one point, and the process moves to step S32. This result is stored in the storage portion 7d.
In step S32, it is determined whether the accumulated count number of the determination count is a predetermined value ("+2" in this embodiment) or larger.
Thus, in this embodiment, it is determined whether or not the user restarts the operation twice after the lapse of the remaining dehumidification time Y in this and former clothes drying operations. Specifically, it is determined whether or not the user has an intention to again dry the clothes in spite of the operation until the dehumidification time Y, and also incorrect determination due to an incorrect input or a prank by a person other than the user is prevented.
Then, the process moves to S33, the application rank Dx described above is increased by one to determine a rank applied to a next operation. Simultaneously, the determination count is reset, the process moves to step S34, and an additional clothes drying operation is performed.
As described above, the user restarts the operation in the standby state, and thus the operation time is corrected to be increased.
The control flows described above are summarized below.

(1) When the user turns off the operation before the remaining dehumidifying operation time Y passes:
- It is estimated that the user determines that dehumidification is sufficient before the set remaining dehumidifying operation time Y. In the next and subsequent operations, the remaining dehumidifying operation time Y is set to be reduced as compared to this time (the application rank Dx is reduced).
(2) When dehumidification is performed until the remaining dehumidifying operation time Y (the additional operation is not performed):
- It is estimated that the user determines that dehumidification is sufficient in the set remaining dehumidifying operation time Y. Specifically, it is determined that the remaining dehumidification time as set has no problem. In the next and subsequent operations, the dehumidifying operation time Y is obtained from the coefficient used for obtaining the dehumidifying operation time Y set this time (the application rank Dx is not changed).
(3) When the user adds the operation after dehumidification is performed until the remaining dehumidifying operation time Y:
- It is estimated that the user determines that dehumidification is insufficient. In the next and subsequent operations, the remaining dehumidifying operation time Y is set to be increased as compared to this time (the application rank Dx is increased).

In this embodiment, the example has been described in which the user's evaluation on the degree of dryness of clothes is estimated from the timing when the user stops the operation, that is, the timing when the user operates the operation switch 8, the estimation is regarded as an input of evaluation information, which leads to correction of the operation time during the normal operation, but not limited to this. The dryness evaluation switch 11 as shown in Figure 4 may be provided so that the user positively inputs evaluation information.
In the case where the user inputs evaluation on the degree of dryness using the dryness evaluation switch 11, for (1) to (3) above, an evaluation of "excessive drying" corresponds to (1), an evaluation of "moderate" corresponds to (2), and an evaluation of "insufficient drying" corresponds to (3).
As described above, according to this embodiment, the degree of dryness of laundry to be dried is corrected for the operation time determined by the control circuit 7 based on the user's evaluation on the degree of dryness of clothes, and the operation is controlled in the corrected operation time.
Also, the user's evaluation information input from the evaluation information input means may be stored in the storage portion 7d, and an amount of correction of the operation time may be changed by accumulation of user's evaluations. This allows a user's satisfaction level on drying to be reflected as evaluation information on the operation time of the clothes drying operation, and allows a drying operation of laundry to be performed to suit to a preference of an individual user.

Industrial Applicability

The dehumidifier according to the present invention can be used for drying laundry to be dried hung in a room.

Description of Symbols

1 air direction variable means, 1a vertical louver, 1b horizontal louver, 1c vertically variable motor, 1d horizontally variable motor, 2 blowing fan, 2a fan motor, 3 temperature sensor, 4 humidity sensor, 5 dehumidification device, 6 infrared sensor, 6a infrared absorbing film, 6b thermistor, 7 control circuit, 7a input circuit, 7b output circuit, 7c CPU, 7d storage portion, 7e timer portion, 8 operation switch, 9 temperature sensor, 10 humidity sensor, 11 dryness evaluation switch, 12 display portion, 100 dehumidifier casing, 101 inlet, 102 water storage tank, 103 outlet, A indoor air, B dry air

Claims

A dehumidifier comprising:
a casing;

a blowing fan that sucks indoor air into the casing and blows out the air;

dehumidification means for removing moisture from the indoor air taken into the casing by the blowing fan; and

control means for controlling the blowing fan and the dehumidification means,

wherein the control means performs a clothes drying operation for drying clothes, and an operation time of the clothes drying operation is determined based on evaluation information on a degree of dryness of clothes in a clothes drying operation formerly performed.
The dehumidifier according to claim 1, further comprising:
temperature detection means for detecting a temperature of the indoor air;

humidity detection means for detecting a humidity of the indoor air; and

operation time measuring means for measuring an operation time from a start of the clothes drying operation,

wherein the control means determines a subsequent operation time based on outputs of an output signal for the operation time from the operation time measuring means and detection signals from the temperature detection means and the humidity detection means when the detection signal from the humidity detection means is a detection signal corresponding to a predetermined humidity or lower, and further corrects the operation time based on the evaluation information to control the clothes drying operation in the corrected operation time.
The dehumidifier according to claim 2, further comprising storage means,
wherein the storage means stores the evaluation information obtained in each clothes drying operation, and
the control means changes an amount of correction of the operation time based on the evaluation information accumulated in the storage means.
The dehumidifier according to any one of claims 1 to 3, further comprising an operation switch for starting and stopping the clothes drying operation,
wherein the control means obtains the evaluation information based on operation timing of the operation switch in the clothes drying operation.
The dehumidifier according to any one of claims 1 to 3, further comprising evaluation input means with which a user can input the evaluation information,
wherein the control means changes an amount of correction of the operation time based on the evaluation information input by the evaluation input means.