JP2018134139A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of performing an optimum washing according to a water temperature of washing water.SOLUTION: The washing machine comprises: a rotary drum 3; a laundry weight detection part 26 for detecting an amount of laundry fed in the rotary drum 3; a dirt detection part 13 for detecting dirt of laundry; a detergent automatic feeding device 15 for automatically feeding a detergent during a washing step; a water temperature detection part 29 for detecting a temperature of washing water; and a control part 18 for sequentially controlling each step of washing, rinsing and dewatering, etc. The control part 18 determines a standard detergent amount and a standard washing time according to an amount of laundry and feeds an amount of a detergent smaller than a standard detergent amount corresponding to the amount of laundry by the detergent automatic feeding device 15, and after feeding a prescribed amount of water, detects a temperature of washing water by the water temperature detection part 29, and when the detected water temperature is not more than a prescribed value, feeds a prescribed amount of the detergent additionally.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washing machine that puts laundry into a washing tub and performs washing by sequentially controlling each process such as washing and rinsing.

  Conventionally, in a washing machine, as shown in Patent Document 1, a user selects whether the laundry is “terrible dirt”, “standard”, or “slightly dirty”, and initially, depending on the result and the amount of laundry The amount of detergent input is determined. Then, during the subsequent washing process, the soil sensor determines whether the laundry has been soiled, and if it is determined that the laundry is insufficient, based on the user's selection result of “severe soiling”, “standard” or “lightly soiling”. An additional amount of detergent was determined.

JP-A 61-172593

  However, in the conventional washing machine shown in Patent Document 1, since the user must input the data by judging the degree of dirt by looking at the laundry, there is a problem that this series of operations is troublesome. there were. In addition, it is left to the user to determine the degree of contamination. Therefore, individual differences greatly affect the determination and the selection of the degree of contamination based on the determination. Some of the users who choose “severe dirt” when there is a laundry that is heavily soiled with oil, mud, fruit juice, etc., in laundry that is hardly soiled. At this time, the amount of detergent supplied by the washing machine is large. If the dirt sensor determines that dirt removal is insufficient during the subsequent washing process, the detergent is additionally added, leading to waste of the detergent and further increasing dirty household wastewater. In addition, the amount of detergent remaining in the laundry increases with the same rinsing, and there is a problem that adverse effects such as rough skin due to the influence of the detergent may occur on the wearer of the clothes.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a washing machine that can perform optimal washing in accordance with the dirt level of the laundry and the temperature of the washing water.

  In order to solve the above-described conventional problems, a washing machine according to the present invention includes a laundry tub for storing laundry, a laundry weight detection unit for detecting the amount of laundry put into the laundry tub, and dirt on the laundry. Detecting stain detection unit, automatic detergent introduction device that automatically puts detergent during the washing process, water temperature detection unit that detects the temperature of the washing water, and control unit that sequentially controls each process such as washing, rinsing and dehydration The control unit determines a standard detergent amount and a standard washing time according to the amount of laundry detected by the laundry weight detection unit, and has a detergent amount smaller than the standard detergent amount corresponding to the laundry amount. After the water is charged by the detergent automatic charging device and a predetermined amount of water is supplied, the temperature of the washing water is detected by the water temperature detection unit, and when the detected water temperature is below a predetermined value, a predetermined amount of the detergent is added. is there. With this configuration, it is possible to obtain an effect of performing optimum washing in accordance with the water temperature of the washing water.

  The washing machine of the present invention can detect the water temperature of the washing water, can perform optimum washing according to the water temperature of the washing water, and can optimize the finish of the laundry.

Side surface sectional drawing of the washing machine in Embodiment 1 of this invention Block circuit diagram of the washing machine in Embodiment 1 of the present invention The flowchart which shows the washing driving | operation operation | movement of the washing machine in Embodiment 1 of this invention.

  A washing machine according to a first aspect of the present invention includes a washing tub that accommodates laundry, a laundry weight detection unit that detects the amount of laundry put in the laundry tub, a stain detection unit that detects stains on the laundry, An automatic detergent loading device that automatically feeds detergent during the process, a water temperature detection unit that detects the temperature of the washing water, and a control unit that sequentially controls each step of washing, rinsing, dehydration, etc. The standard detergent amount and the standard washing time are determined according to the laundry amount detected by the laundry weight detection unit, and a detergent amount smaller than the standard detergent amount corresponding to the laundry amount is charged by the detergent automatic charging device. After the predetermined amount of water is supplied, the temperature of the washing water is detected by the water temperature detection unit, and when the detected water temperature is equal to or lower than the predetermined value, a predetermined amount of detergent is added.

  The finishing level of the laundry washed by the washing machine is greatly affected by the temperature of the washing water used. When the amount of laundry and the amount of detergent used are the same, a large amount of dirt can be removed from the laundry when the temperature of the washing water is high, but the level of dirt removal from the laundry is greatly reduced when the water temperature is low. However, in conventional washing machines, when the amount of laundry is the same rank, the amount of detergent to be added is the same, and the amount of detergent is increased or decreased depending on the temperature of the washing water used. Adjustment was impossible. Therefore, there has been a problem that the washing of the laundry becomes insufficient, or on the contrary, an excessive amount of detergent is consumed, and the washing time becomes long.

  On the other hand, the washing machine of the present invention configured as described above can control the amount of detergent to be added in accordance with the temperature of the washing water. As a result, regardless of the temperature of the washing water used, the effect of performing the optimum washing according to the water temperature can be obtained.

  According to a second aspect of the invention, the control unit performs a washing process for a predetermined time after the temperature of the washing water is detected by the water temperature detection unit, and then determines the level of the laundry based on a signal from the stain detection unit. When the level is equal to or higher than a predetermined value, a predetermined amount of detergent is additionally added and the washing time is extended beyond the standard washing time.

  The level of dirt on the laundry varies greatly depending on the person wearing the laundry and how it is used, but in conventional washing machines, the amount of detergent and the washing time are slightly changed depending on the amount of laundry. It was nothing more than optimal laundry for laundry. Further, when the level of laundry is detected by a soil sensor or the like and washing is performed in accordance with the level of the laundry, there is a problem with the amount of detergent to be supplied for detecting the soil level. In other words, if the amount of detergent that is input for detecting the soil level is the standard amount of detergent corresponding to the amount of laundry, an excessive amount of detergent is input when the soil level is lower than the standard, and the detergent is wasted. There was a problem of becoming.

  On the other hand, the washing machine of the present invention having the above configuration can control the amount of detergent and the washing time to be added according to the dirt level of the laundry after performing the washing process for a predetermined time according to the temperature of the washing water. it can. Thereby, in addition to the detergency that matches the water temperature, the detergency that also matches the dirt level can be applied to the laundry. Therefore, it is possible to obtain the effect of performing optimum washing in accordance with the dirt level of the laundry and the water temperature of the washing water.

In a third aspect of the invention, when the dirt level is less than a predetermined value, the control unit does not add a detergent and does not extend the washing time from the standard washing time. As a result, when the dirt level is less than the predetermined value, unnecessary detergent is not introduced and the amount of detergent used can be reduced. Furthermore, the effect which can improve a rinse performance is acquired. Moreover, it becomes possible to implement | achieve reduction of the amount of water used for a rinse, and the rinse time by the improvement in a rinse performance.

  4th invention uses the turbidity sensor which detects the stain | concentration density | concentration of wash water as said stain | pollution | contamination detection part. The effect of being able to detect the degree of dirt on the laundry in real time and in a timely and accurate manner by detecting the degree of dirt on the laundry by detecting the dirt concentration of the washing water using a turbidity sensor Is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, what is called washing water in the following embodiments indicates water containing a detergent component used in the washing step.

(Embodiment 1)
FIG. 1 is a side sectional view of a washing machine according to Embodiment 1 of the present invention. FIG. 2 is a block circuit diagram of the washing machine according to Embodiment 1 of the present invention. FIG. 3 is a flowchart showing a washing operation of the washing machine according to Embodiment 1 of the present invention.

  The washing machine according to the present embodiment is a drum type washing machine that performs washing by rotating, rotating, and rotating the rotating drum in which the laundry is stored. As shown in FIG. 1, a water receiving tank 2 is disposed inside a drum type washing machine 1. A rotating drum 3 serving as a washing tub is disposed inside the water receiving tub 2 so as to be rotatable around a horizontal rotation axis. The rotating drum 3 is rotated by a motor 4 connected to the back surface.

  Each of the water receiving tank 2 and the rotating drum 3 is formed in a bottomed cylindrical shape having an opening on the front surface. An opening / closing door 27 is provided on the front surface of the drum type washing machine 1 so as to face the front opening of the water receiving tub 2 and the rotating drum 3. The user opens the door 27 and puts the laundry in and out of the rotary drum 3.

  The rotating drum 3 is provided with a plurality of through holes (not shown) on the outer peripheral surface, and water and air circulate therethrough. In addition, several protruding plates (not shown) are provided on the inner wall surface, and the laundry is lifted and stirred when the rotary drum 3 rotates. The rotating drum 3 functions not only as a washing tub, but also as a dehydrating tub and a drying tub depending on the process to be executed.

  A water intake 5 is connected to the lowest part on the rear side of the water receiving tank 2. The water intake 5 is connected to a drain pipe 7 that is opened and closed by a drain valve 6. A circulation path 9 is provided from between the water intake 5 and the drain valve 6. A discharge port 8 is formed at the tip of the circulation path 9 and is opened from the front lower portion of the water receiving tank 2 into the rotary drum 3. A circulation pump 10 is incorporated in the circulation path 9. By driving the circulation pump 10, the wash water in the water receiving tub 2 passes through the circulation path 9 and is discharged into the rotary drum 3 as a circulation shower. In this way, circulating water can be applied to the laundry in the rotating drum 3.

Above the water receiving tank 2, a water supply valve 11 that controls water supply into the water receiving tank 2 is provided. A water level detection unit 12 is provided in communication with the water receiving tank 2. The water level detector 12 detects the water level in the water receiving tank 2. Further, a dirt detection unit 13 is provided in the circulation path 9. The dirt detection unit 13 is configured by a turbidity sensor or the like, and detects the dirt concentration of the wash water flowing in the circulation path 9. By this detection, the dirt detector 13 detects the dirt of the laundry. A water temperature detector 29 is provided in the water receiving tank 2 below the rotary drum 3.
The water temperature detection part 29 is comprised by the water temperature sensor etc., and measures the water temperature of the wash water in the water receiving tank 2. As shown in FIG.

  The detergent storage unit 14 is used for charging a detergent used during the washing process and a softening agent used during the rinsing process. The detergent storage unit 14 includes an automatic detergent charging device 15 having storage units (not shown) for liquid detergent and softener. The detergent storage part 14 is provided with a receiving part 14a for receiving a liquid detergent and a softening agent introduced from the insertion port 16 of the automatic detergent introduction apparatus 15. The water that has passed through the water supply valve 11 passes through the receiving portion 14a of the detergent storage portion 14, and at this time, the liquid detergent or softening agent introduced into the receiving portion 14a is poured into the water receiving tank 2 together with the supplied water.

  As shown in FIG. 2, the control device 17 includes a control unit 18 configured with a microcomputer. The control unit 18 controls operations of the motor 4, the drain valve 6, the circulation pump 10, the water supply valve 11 and the like via the power switching unit 19, and sequentially controls a series of processes such as washing, rinsing, and dehydration.

  The control unit 18 has a database of dirt levels of washing water. The control unit 18 compares the washing water stain level database with the signal from the stain detection unit 13, so that the stain concentration of the wash water, that is, the stain level of the laundry is determined in a stepwise manner. Determine which level you are in. In the drum type washing machine 1 of the present embodiment, four levels are set as the dirt level defined in stages.

  The input setting unit 20 is for the user to input and set a driving course or the like. The control unit 18 receives information from the input setting unit 20 and displays the information on the display unit 21 based on the information to notify the user. The storage unit 22 stores data necessary for the control unit 18 to control the washing operation. The power switch 24 turns on and off the commercial power source 23 supplied to the drum type washing machine 1.

  The drum type washing machine 1 is provided with a rotation speed detection unit 25 that detects the rotation speed of the rotary drum 3. Information of the rotational speed detection unit 25 is sent to the control unit 18, and the control unit 18 controls the rotation of the motor 4 through the power switching unit 19 to drive the rotary drum 3. In addition, the drum type washing machine 1 is provided with a laundry weight detection unit 26 that detects the weight (amount of laundry) of the laundry accommodated in the rotary drum 3.

  About the drum-type washing machine 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated using FIG.

  When the user puts laundry into the rotary drum 3 and presses the power switch 24, the washing operation of the drum type washing machine 1 starts (step 1). As a result, the user can input a washing course or the like to the input setting unit 20.

  The user selects a washing course, for example, an “auto care course” by the input setting unit 20 (step 2). Then, the control unit 18 notifies the user by displaying on the display unit 21 that the “auto care course” has been selected based on the information from the input setting unit 20.

  Next, when the washing process is started in the “auto care course” selected by the user pressing the laundry start button, the laundry weight detection unit 26 detects the weight of the laundry (step 3). The laundry weight detection is performed by detecting the magnitude of the drive current signal of the motor 4 when the control unit 18 controls the motor 4 to rotate the rotating drum 3 together with the laundry.

  The control unit 18 determines which of the plurality of ranks in which the amount of the laundry is preset corresponds to the detected weight of the laundry. Then, the control unit 18 determines the washing time, the washing time, and the detergent input amount in accordance with the laundry amount determination result (step 4). The control unit 18 notifies the user by displaying the determined washing time and washing time on the display unit 21 (step 5).

  Prior to water supply, the control unit 18 operates the automatic detergent charging device 15 so that the liquid detergent is automatically charged into the receiving part 14a of the detergent storage unit 14 (step 6). For this reason, it is not necessary for the user to put the detergent into the detergent container 14. At this time, the amount of liquid detergent introduced by the automatic detergent feeder 15 is less than the standard amount of detergent corresponding to the amount of laundry at the start of the course operation, that is, the laundry level is the same as the standard with the same amount of laundry. The value of the amount of detergent when it is smaller is also applied.

  After adding the liquid detergent, the control unit 18 immediately starts water supply to the water receiving tank 2. The control unit 18 opens the water supply valve 11, and the water that has passed through the water supply valve 11 passes through the detergent storage unit 14. As a result, the amount of liquid detergent introduced into the receiving portion 14a of the detergent container 14 from the inlet 16 of the detergent automatic charging device 15 when the dirt level is smaller than the standard is received together with the supplied water. It is poured into the tank 2 (step 7).

  Thereafter, the control unit 18 starts pre-washing with washing water in which a detergent amount smaller than the standard detergent amount corresponding to the laundry amount is dissolved (step 8). The control unit 18 drives the rotary drum 3 according to the sequence of “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”. The control unit 18 further drives the circulation pump 10. As a result, the wash water in the water receiving tub 2 passes through the circulation path 9 and is discharged into the rotary drum 3 as a circulation shower. When the water level detector 12 detects that the water level in the water receiving tank 2 has reached the predetermined water level, the control unit 18 starts counting the washing time and sends a signal to the water supply valve 11 to supply the water receiving tank 2 to the water receiving tank 2. Water supply is stopped and the circulation pump 10 is stopped.

  After that, the control unit 18 performs tumbling on the rotating drum 3 in the same manner as described above in accordance with the sequence of “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”. carry out. The control unit 18 further starts the operation of the circulation pump 10 and sends a signal to the water supply valve 11 by the signal of the water level detection unit 12, restarts the water supply to the water receiving tank 2, performs water supply to a predetermined water level, Complete the water supply.

  After the water supply is completed, the control unit 18 receives water temperature information from the water temperature detection unit 29. The control part 18 determines whether the water temperature of the washing water in the water receiving tub 2 is below a predetermined value (step 9).

  If the water temperature is equal to or lower than the predetermined value, for the purpose of improving the cleaning performance by increasing the amount of detergent, the control unit 18 sends a signal to the detergent automatic input device 15 to operate, and inputs a predetermined amount of detergent. For example, if the water temperature of the washing water is 15 ° C. or less, and the amount of laundry is 4.5 kg, the control unit 18 additionally inputs 3 mL of detergent. Then, the control unit 18 quickly opens the water supply valve 11 for a predetermined time, supplies an appropriate amount of tap water from the tap water, and introduces the additionally supplied detergent into the water receiving tank 2 together with the supplied water (step 10).

  If the water temperature is higher than the predetermined value, the control unit 18 does nothing (step 11).

  Thereafter, the control unit 18 performs pre-washing for a predetermined time (step 12).

When the pre-washing is completed, the control unit 18 detects the stain on the laundry and determines the stain level. The control unit 18 receives a signal relating to the stain concentration of the wash water detected by the stain detection unit 13. And the control part 18 determines the dirt level at that time based on the dirt density database of the washing water which the control part 18 has (step 13). Then, the control unit 18 determines the additional detergent amount and the extended washing time based on the determined dirt level and the laundry amount (step 14 or step 16).

As described above, the dirt levels are set in four levels from the dirt level 1 to the dirt level 4 in ascending order of the dirt density. The dirt level 2 is set as the standard dirt level. The table used for this determination is defined according to the rank of the laundry quantity. In the drum type washing machine 1 of the present embodiment, for example, when the amount of laundry is 4.5 kg, the additional detergent amount and the extended washing time with respect to the dirt level are determined to the following values according to the following table. Is defined.
* Dirt level 1: No detergent added, no washing time extended * Dirt level 2: Additional detergent (standard detergent amount-initial detergent amount) added to the standard detergent amount, extended washing time 4 minutes * Dirt level 3: Add the remaining amount of detergent to the standard detergent amount (standard detergent amount-initial input detergent amount), extend the washing time by 7 minutes * Stain level 4: Detergent of the remaining amount relative to the standard detergent amount (standard detergent amount-initial input detergent amount) Added, washing time extended by 10 minutes

  That is, if the result of determination of the dirt level of the 4.5 kg laundry is the dirt level 2 or higher in the table, the control unit 18 sets the amount of additional detergent and the extended washing time according to the determined dirt level. Next (step 14), the detergent is additionally charged, the additional water is supplied, and the washing time is reset (step 15).

  Specifically, the control unit 18 sends a signal to the automatic detergent charging device 15, and in accordance with the table definition, the remaining amount of detergent (standard detergent amount−initially charged detergent amount) with respect to the standard detergent amount is stored in the detergent storage unit 14. It is added to the receiving part 14a. For example, when the laundry amount is 4.5 kg and the standard detergent amount is 20 mL, the detergent at the start of washing is 16 mL corresponding to the dirt level 1, and this amount of detergent is introduced. However, when the dirt level is 2, 4 mL is insufficient. Therefore, the controller 18 adds 4 mL of liquid detergent, and further opens the water supply valve 11 for a predetermined time to supply water to allow the liquid detergent to reach the water receiving tank 2.

  Then, the control unit 18 resets the washing time to be 4 minutes longer than the standard washing time. For example, when the amount of laundry is 4.5 kg, the standard washing time is 14 minutes, and the predetermined washing time until stain detection is 7 minutes. Accordingly, although the remaining washing time is 7 minutes, the remaining washing time after resetting is 11 minutes (total washing time 18 minutes) because it is longer by 4 minutes.

  Further, when the dirt level is 1, no additional detergent is required and no additional washing time is required. Therefore, the control unit 18 does not add additional detergent and does not extend the washing time, and maintains the initial washing time (step 16). ).

  When the detergent is added and the remaining washing time is set as described above, the control unit 18 performs the main washing (step 17). When the washing time after the resetting has elapsed, the control unit 18 stops the rotation of the rotary drum 3, opens the drain valve 6, and passes the washing water in the water receiving tub 2 out of the drum type washing machine 1 through the drain pipe 7. Then, the washing process is finished (step 18).

When the control unit 18 finishes the washing process, the control unit 18 proceeds to the rinsing process (step 19). The case where it is set that the rinsing process is performed twice in the rinsing process will be described. When the drainage performed at the end of the washing process is completed, first intermediate dehydration of the first rinse is started.

  The control unit 18 rotates the rotating drum 3 and increases the rotation speed of the rotating drum 3 to 900 r / min which is a predetermined rotation speed through balance control, and performs the first intermediate dehydration. By this first intermediate dehydration, the wash water remaining in the laundry is discharged out of the drum type washing machine 1, and the wash water contained in the laundry is reduced. When the rotating drum 3 is rotated at 900 r / min for a predetermined time, the control unit 18 sends a signal to the motor 4 to stop the rotation of the rotating drum 3.

  After the rotary drum 3 stops, the control unit 18 opens the water supply valve 11 and starts water supply. The water that has passed through the water supply valve 11 passes through the detergent container 14 and is stored in the water receiving tank 2.

  The control unit 18 starts the rotation of the rotary drum 3 at, for example, 50 r / min from the middle of water supply. At the same time, the circulation pump 10 is driven. Thereby, the rinse water in the water receiving tank 2 passes through the circulation path 9 and is discharged into the rotating drum 3 as a circulation shower. When the control unit 18 determines that the predetermined water level has been reached by the water level detection unit 12, the control unit 18 stops the water supply to the water receiving tank 2 by closing the water supply valve 11.

  Then, the control unit 18 determines that the first rinsing is completed when a predetermined time has elapsed, and opens the drain valve 6 to drain the rinse water accumulated in the water receiving tank 2.

  When drainage is completed, the second intermediate dehydration of the second rinse is started. The control unit 18 rotates the rotary drum 3 to perform the second intermediate dehydration in the same manner as the first intermediate dehydration. By this second intermediate dehydration, the washing water remaining in the laundry is discharged out of the drum type washing machine 1, and the detergent contained in the laundry is reduced.

  After the rotary drum 3 stops, the control unit 18 opens the water supply valve 11 and starts water supply. The supplied water is stored in the water receiving tank 2 through the detergent container 14. At this time, if the softening agent has been put into the detergent container 14, the softening agent is poured into the water receiving tank 2 together with the supplied water.

  After the end of the second intermediate dehydration, the control unit 18 performs the second rinse in the same manner as the first rinse. The control unit 18 determines that the second rinsing has been completed when a predetermined time has elapsed, and opens the drain valve 6 to drain the rinse water accumulated in the water receiving tank 2.

  In the above rinsing process, the liquid detergent is not charged into the water that has passed through the water supply valve 11 from the detergent automatic charging device 15. The water that has passed through the water supply valve 11 is supplied as it is into the water receiving tub 2 and further into the rotating drum 3 in which the laundry is accommodated, and is used for rinsing.

  When the drainage performed after the end of the second rinse is completed, the final dehydration process is started (step 20). The control unit 18 rotates the rotating drum 3 and increases the rotation speed of the rotating drum 3 to 900 r / min, which is a predetermined rotation speed for final dehydration, through balance control, and performs the final dehydration process. By this final dehydration step, the washing water remaining in the laundry is discharged out of the drum type washing machine 1, and the detergent contained in the laundry is almost eliminated. When the rotating drum 3 is rotated at 900 r / min for a predetermined time, the control unit 18 sends a signal to the motor 4 to stop the rotation of the rotating drum 3. When the rotary drum 3 stops, the control unit 18 turns off the power switch 24 and ends the washing operation (step 21).

As described above, in the drum type washing machine 1 according to the present embodiment, the control unit 18 detects the level of the laundry, and the liquid detergent to be fed by the detergent automatic feeding device 15 at the start of washing. Set the input amount low. That is, at the start of the washing operation, a detergent amount smaller than the standard detergent amount corresponding to the laundry amount is used. That is, the value of the detergent amount of the soil level 1 when the soil level of the laundry is smaller than the standard soil level 2 with the same laundry amount is used.

  In this case, the dirt level of the laundry is unknown during the washing time until the dirt level is detected. Therefore, the washing process is performed with the amount of detergent of the dirt level 1 smaller than the standard detergent quantity of the dirt level 2. In this state, the cleaning performance until the completion of the cleaning time for detecting the dirt level becomes smaller than usual. And even if the amount of detergent corresponding to the amount of laundry is to be input after the dirt level is detected, the cleaning performance remains low unless the washing time remains unchanged.

  In winter and the like, the temperature of tap water used for washing decreases as the outside air temperature decreases. Therefore, in the winter season and the like, if the washing time is washed with the detergent amount determined according to the amount of laundry, there is a problem that the washing performance is insufficient and the finished quality of the laundry is lowered.

  On the other hand, the drum type washing machine 1 in the present embodiment detects the water temperature of the washing water, and when the water temperature is equal to or lower than the predetermined value, it is possible to prevent the cleaning performance from being deteriorated by additionally introducing a detergent. Is obtained.

  Also, in the drum type washing machine 1 of the present embodiment, after the dirt level is detected, an additional amount of detergent corresponding to the quantity of laundry is input, and the washing time is extended in accordance with the detected dirt level. As a result, the amount of detergent until the level of dirt is detected may not be the amount of detergent that matches the level of dirt, but by correcting this, it is possible to prevent deterioration of the washing performance and improve the washing performance of the washing process. You can be surely up. And the effect which can ensure the optimal finish of the laundry according to the dirt level of the laundry is acquired.

  In addition, in the drum type washing machine 1 of the present embodiment, the amount of detergent input during the washing time for detecting the dirt level is set to be small in many cases. Therefore, there is almost no shortage of detergent for laundry with little soiling, and the cleaning performance is hardly lowered even if the washing time is not extended. In conventional washing machines, even when there are few stains, a greater amount of stain level standard detergent was introduced than required. In the drum type washing machine 1 of the present embodiment, the amount of detergent from the start of washing is an amount corresponding to the case where there is little dirt, and the laundry with little dirt can be sufficiently washed as it is. Therefore, when there is little dirt, the amount of detergent used can be reduced.

  Further, by reducing the amount of detergent, washing is performed without using an unnecessary amount of detergent. Thereby, in addition to the effect of reducing the amount of detergent used, it is possible to substantially eliminate the detergent remaining in the laundry and to improve the rinsing performance. In addition, by improving the rinsing performance, it is possible to reduce the amount of water used for rinsing and reduce the rinsing time.

  Moreover, the drum type washing machine 1 of this Embodiment uses the turbidity sensor which detects the dirt density | concentration of wash water as a dirt detection part. That is, the degree of dirt on the laundry is detected by detecting the dirt concentration of the washing water using a turbidity sensor. As a result, it is possible to obtain an effect that the degree of dirt on the laundry can be detected accurately at low cost in real time and in a timely manner.

In addition, description of this Embodiment was demonstrated as an example to the last when the amount of laundry is 4.5 kg. Settings and operations according to the level of dirt, such as the amount of standard detergent, the amount of additional detergent, the predetermined washing time at the start, the extended washing time, and the washing time, are individually set according to the amount of laundry.

  Moreover, in this Embodiment, although the water receiving tank 2 and the rotating drum 3 shall be arrange | positioned horizontally, the water receiving tank 2 and the rotating drum 3 may incline. Moreover, the timing of the water supply in the washing process, the rinsing process, and the final dehydration process, the timing of the circulating shower, the rotational speed of the rotary drum 3 and the like are not particularly limited by the above embodiment. Furthermore, the amount of liquid detergent supplied from the automatic detergent charging device 15, the extended washing time, the level of dirt on the laundry, the temperature of the washing water, etc. are not particularly limited.

  In addition, the automatic loading of the softening agent has been described on the assumption that the detergent storage unit 14 and the automatic detergent charging device 15 common to the liquid detergent are used. However, a storage unit dedicated to the softening agent or an automatic charging device is installed, There is no particular problem with the configuration in which the softening agent is automatically charged by these.

  As described above, in the washing machine according to the present invention, the control unit determines the standard detergent amount and the standard washing time according to the laundry amount, and the detergent amount is smaller than the standard detergent amount corresponding to the laundry amount. After a predetermined amount of water is supplied by the charging device, the temperature of the washing water is detected by the water temperature detection unit, and when the detected water temperature is equal to or lower than the predetermined value, a predetermined amount of detergent is added. The effect that can be washed optimally according to the water temperature is obtained. Therefore, the washing machine according to the present invention is particularly useful as a domestic washing machine and a washing / drying machine, etc., in which tap water is used and laundry having different soil levels is often washed each time washing is performed.

1 Drum-type washing machine 2 Water receiving tank 3 Rotating drum (washing tank)
4 Motor (drive unit)
6 Drain valve 9 Circulation route 10 Circulation pump 11 Water supply valve (water supply section)
DESCRIPTION OF SYMBOLS 12 Water level detection part 13 Dirt detection part 15 Detergent automatic injection | throwing-in apparatus 17 Control apparatus 18 Control part 20 Input setting part 26 Laundry weight detection part 29 Water temperature detection part

Claims (4)

A laundry tub for storing laundry, a laundry weight detection unit for detecting the amount of laundry put in the laundry tub, a stain detection unit for detecting laundry stains, and a detergent is automatically added during the washing process. An automatic detergent loading device, a water temperature detection unit that detects the temperature of the washing water, and a control unit that sequentially controls each process such as washing, rinsing, and dehydration, the control unit is detected by the laundry weight detection unit A standard detergent amount and a standard washing time are determined according to the amount of laundry that has been made, and a detergent amount smaller than the standard detergent amount corresponding to the laundry amount is charged by the detergent automatic charging device, and after supplying a predetermined amount of water, the water temperature A washing machine, wherein a temperature of washing water is detected by a detection unit, and when the detected water temperature is equal to or lower than a predetermined value, a predetermined amount of detergent is added. The control unit performs a washing process for a predetermined time after the temperature of the washing water is detected by the water temperature detection unit, and then determines the level of the laundry based on a signal from the stain detection unit. In this case, the washing machine according to claim 1, wherein a predetermined amount of detergent is additionally added and a washing time is extended beyond the standard washing time. 3. The washing machine according to claim 2, wherein when the dirt level is less than a predetermined value, the control unit does not add a detergent and does not extend a washing time from the standard washing time. 4. The washing machine according to any one of claims 1 to 3, wherein a turbidity sensor that detects a stain concentration of washing water is used as the stain detection unit.

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