JP6702699B2 - Washing machine - Google Patents

Description

Embodiments of the present invention relate to a washing machine.

For example, in a drum type washing machine, a structure is proposed in which a warm water heater is provided in the lower portion of the water tank, and the wash water stored in the water tank (washing tank) can be heated by the warm water heater. (For example, refer to Patent Document 1). The washing machine of Patent Document 1 has a "wet towel cleaning course". In this towel cleaner course, the rinsing step is executed in a state where the water in the water tank is heated to be warmed. Further, the finishing agent is charged in a state where the hot water heater is in a disconnected state. This makes it possible to obtain a warm towel (steamed towel).

JP 2004-167064 A

By the way, in recent years, an increasing number of users are worried about the generation of odors and yellowing when laundry is dried in the room due to the proliferation of bacteria attached to clothes, and the antibacterial effect of laundry has been demanded. Is coming. Therefore, there is also provided a washing machine in which a slow-dissolving antibacterial agent is placed in the middle of the water supply route and washing is performed with washing water containing the antibacterial agent for easy rinsing. However, some users are not satisfied with the current antibacterial effect, and further improvement of the antibacterial effect is desired.

Therefore, a washing machine capable of executing a washing operation having a high antibacterial effect on laundry is provided.

The washing machine according to the present embodiment includes a washing tub in which laundry is stored and a washing and rinsing process is performed, a hot water heater that heats the washing water in the washing tub to warm it, and a washing in the washing tub. A circulation pump for sprinkling water toward the laundry in the washing tub while circulating water through the circulation path, an antibacterial agent disposed in the circulation path and having a slow solubility for water, and the hot water heater in the rinsing step. by in a heated state of the washing water in the washing tank, and control means for executing the laundry high concentration antibacterial rinsing operation for watering toward the circulating pump is driven detergent had tank, said control means After the final rinsing operation in the rinsing process, the high-concentration antibacterial rinsing operation is performed, and the high-concentration antibacterial rinsing operation is performed at a predetermined water level lower than that of the rinsing rinse with washing water at 35° C. It is carried out by heating in the range of 45°C .

1 is a perspective view schematically showing an external configuration of a washing machine according to the first embodiment. Perspective view schematically showing the internal structure Block diagram showing the electrical configuration of the washing machine The flowchart which shows the control procedure which the control apparatus performs in the washing operation of an automatic course. Time chart showing the on/off status of each part in the main process The figure which shows the result of having investigated the temperature dependence of the solubility of an antibacterial agent. A flow chart which shows a 2nd embodiment and shows a control procedure which a control device performs in a washing operation of an automatic course. Time chart showing the on/off status of each part in the main process

(1) First Embodiment Hereinafter, a first embodiment applied to a drum-type washing machine equipped with a circulation pump will be described with reference to FIGS. 1 to 6. First, the overall configuration of the washing machine 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, this washing machine 1 has an outer box 2 which has a substantially rectangular box shape and constitutes a main body of the washing machine. A base plate 3 is provided at the bottom of the outer box 2. A circular clothing entrance (not shown) is provided at the center of the front surface of the outer box 2, and a door 4 for opening and closing the clothing entrance is provided.

An operation panel 5 is provided on the front portion of the upper surface of the outer box 2. The operation panel 5 is provided with a power-on key 6 and a power-off key 7. Also. Although not shown in detail, the operation panel 5 is provided with various operation keys for performing various settings relating to the washing operation, and various display portions for performing necessary display. Although not shown, the various operation keys include a course selection key for selecting a washing operation course, a manual setting key for performing a manual setting, and the execution of a high-concentration antibacterial rinsing operation described later. An operation setting key for setting the presence or absence of is provided. On the back side of the operation panel 5, a control device 8 (see FIG. 3) is provided as control means for controlling the entire washing machine 1.

FIG. 2 shows the internal structure of the washing machine 1 with the outer case 2 removed, and in the outer case 2, a horizontal axis cylindrical water tub 9 is provided in a state of being slightly inclined rearward and downward. There is. The water tank 9 is supported on the base plate 3 via a plurality of (for example, a pair of left and right) suspensions 10 (only a part is shown). At the front end of the water tank 9, an annular water tank cover 9a is provided. The aquarium cover 9a constitutes a laundry inlet that communicates with the clothes outlet. An outer rotor type motor 11 (illustrated only in FIG. 3), which is, for example, a brushless DC motor, is arranged at the center of the rear end side of the water tank 9.

In the water tub 9, a cylindrical rotating tub (drum) 12 as a washing tub for containing laundry (clothes) is rotatably supported. The rotary tank 12 is configured to rotate about an inclined shaft extending in the front-rear direction and slightly inclined rearward and downward. The rotation shaft of the motor 11 penetrates the back surface of the water tank 9 and is connected to the central portion of the rear end side of the rotation tank 12. As a result, the rotary tank 12 is directly driven to rotate by the motor 11. A large number of holes 12a for water passage and ventilation are formed in the peripheral wall of the rotary tub 12, and a plurality of, for example, 3 for scraping laundry (for stirring) are provided on the inner peripheral surface of the rotary tub 12. A single baffle 13 is provided. The front opening of the rotary tank 12 faces the inlet of the water tank cover 9a. A rotation sensor 14 (shown only in FIG. 3) for detecting the position of the motor 11 is provided in the motor 11 portion.

Then, in the present embodiment, as shown in FIG. 2, a recess 15 is provided in a portion of the bottom of the water tub 9 where the washing water is stored so as to be located at a leftward position so as to be convex downward. A hot water heater 16 for generating hot water in the water tank 9 is provided in the recess 15. Although not shown in detail, the hot water heater 16 is, for example, a sheathed heater, and is provided so as to be held by a heater holder. In the recess 15, a water temperature sensor 17 (see FIG. 3), which is formed of, for example, a thermistor and serves as a water temperature detecting means for detecting the temperature of the washing water at the bottom of the water tank 9.

A water supply mechanism 18 for supplying water to the inside of the water tank 9 is provided at the upper left part of the water tank 9 in the upper part of the outer box 2. The water supply mechanism 18 includes a water supply valve 19 and a water injection case 20. A hose connection port 19a is provided at the inlet of the water supply valve 19 so as to be connected to water. The outlet of the water supply valve 19 is connected to the inlet of the water injection case 20, and the outlet of the water injection case 20 is connected to the water tank 9. Although not shown, inside the water injection case 20, a detergent storage portion and the like are provided. As a result, when the water supply valve 19 is opened, tap water is supplied from the hose connection port 19a to the water tank 9 through the water supply valve 19 and the water injection case 20 in this order.

On the other hand, a drain port (not shown) is formed at the bottom of the water tank 9, and the base end of the in-machine drain hose 21 is connected to the drain port. The antibacterial agent unit 22 and the lint filter 23 are sequentially connected to the tip end side of the in-machine drainage hose 21. The outlet side of the lint filter 23 is connected to the inlet side of the circulation pump 24. A drain valve 25 is connected to the downstream side of the circulation pump 24, and a drain pipe 26 for draining water outside the machine is connected to the outlet side of the drain valve 25. One end of the circulation hose 27 is connected to the discharge port of the circulation pump 24, and the other end of the circulation hose 27 is connected to a fountain nozzle (not shown) provided on the water tank cover 9a.

Here, although detailed illustration is omitted, the antibacterial agent unit 22 will be briefly described. As is well known, the antibacterial agent unit 22 is configured to accommodate a required amount of a slowly dissolving antibacterial agent in a water-permeable case having an inlet and an outlet. What is called antibacterial glass is adopted as the antibacterial agent. That is, the antibacterial agent is formed in a granular shape (cube shape) in which, for example, phosphoric acid-based glass or boric acid-based glass as a soluble glass is loaded with an antibacterial component (for example, silver oxide) mainly containing silver ions. .. When water passes through and contacts this antibacterial agent, silver ions are gradually dissolved in the water, and antibacterial water can be obtained. The function and amount of the antibacterial agent are adjusted so that it can be used without replacement, for example, for 10 years.

As a result, when the circulation pump 24 is driven with the drain valve 25 closed, the washing water in the water tank 9 passes through the drain port, the in-machine drain hose 21, the antibacterial agent unit 22, and the lint filter 23. Be sucked. Then, the suctioned wash water passes through the circulation hose 27, and is sprayed from the fountain nozzle into the rotary tub 12 in a shower shape. Therefore, the in-machine drainage hose 21, the circulation hose 27, etc. constitute a circulation path for the wash water. At this time, when the wash water passes through the antibacterial agent unit 22 in the circulation path, the antibacterial component is dissolved in the wash water to become antibacterial water, which is poured into the laundry in the rotary tub 12.

On the other hand, when the drainage valve 25 is opened while the drive of the circulation pump 24 is stopped, the water in the water tank 9 is drained by the in-machine drainage hose 22, the antibacterial agent unit 22, the lint filter 23, the circulation pump 24, the drainage valve 25, It is discharged to the outside of the machine through the drainage pipe 26. When the wash water passes through the lint filter 23, the lint contained in the wash water is captured. Although not shown in detail, the lint filter 23 is configured to be able to be taken in and out by operating a cap at the tip thereof, and the outer box 2 is provided with an opening for taking in and out (inspecting) the lint filter 23. The opening is closed by a cover 2a (see FIG. 1) so that it can be opened and closed.

Although not shown in detail, an air trap is provided in the lint filter 23 portion, and a water level sensor 28 connected to the air trap and an air tube is provided at the uppermost portion in the outer box 2 (see FIG. 3). Are arranged. Thus, the water level sensor 28 detects the water level in the water tank 9. Further, although not shown, a drying unit for circulating and supplying warm air into the rotary tub 12 to dry the laundry is provided in the outer box 2. The drying unit is composed of a circulation duct provided so as to connect an air supply port and an exhaust port provided in the water tank 9 outside the water tank 9, a blower fan and a heater provided in the circulation duct. ing. A dehumidifying means such as a heat pump may be provided in the circulation duct.

FIG. 3 schematically shows the electrical configuration of the washing machine 1 centering on the control device 8 described above. The control device 8 is mainly composed of a microcomputer including a CPU, a ROM, a RAM, etc., and controls the entire washing machine 1 to execute each step of the washing operation. Further, operation signals from various operation keys of the operation panel 5 are input to the control device 8, and the control device 8 controls display on various display portions of the operation panel 5. Detection signals from the water temperature sensor 17, the water level sensor 28, and the rotation sensor 14 are input to the control device 8. Then, the control device 8 drives and controls the motor 11 via a drive circuit (not shown), and also controls the water supply valve 19, the drain valve 25, the circulation pump 24, the hot water heater 16 and the like, respectively.

With the above configuration, the control device 8 controls each mechanism of the washing machine 1 based on the input signal from each sensor and the control program stored in advance according to the driving course set by the user on the operation panel 5. The washing operation including the well-known washing, rinsing, and dehydrating steps is controlled and automatically executed. At this time, the control device 8 can perform the washing operation of the warm water washing course by advancing the washing process while heating the wash water by the warm water heater 16 to, for example, about 60° C. after supplying water into the water tank 9. It is said that. By washing with this warm water, improvement in washing performance can be expected.

Now, in the present embodiment, when the execution of the high-concentration antibacterial rinse operation is set (turned on) by the operation of the operation setting key of the operation panel 5 by the user, the control device 8 controls the high-concentration in the rinsing process. Perform antibacterial rinse action. As will be described in the following operation explanation (flowchart explanation), this high-concentration antibacterial rinsing operation is performed by driving the circulation pump 24 while the washing water in the water tank 9 is heated to about 40° C. by the warm water heater 16. Sprinkling water toward the laundry in the wash tub 9 is performed for a predetermined time, for example, 5 minutes. Therefore, the control device 8 functions as a control means.

In the present embodiment, the control device 8 executes the high-concentration antibacterial rinsing operation after the rinsing operation, so-called rinsing, is executed during the rinsing stroke. In this case, in the high-concentration antibacterial rinsing operation, the washing water in the water tank 9 is heated to a predetermined temperature higher than room temperature by the warm water heater 16 while the washing water is at a predetermined water level (a predetermined water level lower than that in the case of rinsing). After turning the hot water heater 16 off, the circulation pump 24 is driven for a predetermined time, for example, 5 minutes in the present embodiment. At this time, the predetermined temperature for heating the wash water may be in the range of 35°C to 45°C, for example, and is about 40°C in the present embodiment. Thus, it has been confirmed that when the wash water passes through the antibacterial agent unit 22, the antibacterial component is dissolved in the wash water at a concentration about twice that of the normal time when the wash water at room temperature is used.

When the rinsing operation is repeated a plurality of times, the high-concentration antibacterial rinsing operation is executed after the final rinsing operation is executed. Further, in the present embodiment, when performing the high-concentration antibacterial rinsing operation, the control device 8 rotationally drives the rotary tub 12 in addition to the driving of the circulation pump 24 so that the laundry stirring operation is also performed. Is becoming In the present embodiment, the circulation pump 24 is driven after heating the wash water, but the drive of the circulation pump 24 is started while the warm water heater 16 is on, that is, while the wash water is being heated. You can

Next, the operation of the washing machine 1 having the above configuration will be described with reference to FIGS. 4 to 6. The flowchart of FIG. 4 shows a case where the automatic course washing operation executed by the control device 8 in the state where the execution of the high-concentration antibacterial rinsing operation is set (ON), that is, the steps of washing, rinsing, and dehydration are sequentially performed. , Particularly showing detailed processing steps in the rinsing process. In the time chart of FIG. 5, the rotary tank 12, the water supply valve 19, the drainage valve 25, the circulation pump 24, and the hot water heater 16 are turned on and off with respect to the rinse 2 and the high-concentration antibacterial rinse operation, and the dehydration process. Is shown.

At this time, in the rinsing process, the shower rinsing operation is executed as rinsing 1, then the rinsing operation of pool rinsing is executed as rinsing 2, and then the high-concentration antibacterial rinsing operation is executed. In this case, the rinse is the final rinse operation because of rinse 2. The rinsing process is performed for about 30 minutes as a whole. If the rinsing operation is one rinsing rinse, the rinsing becomes the final rinsing operation because it is once, and then the high-concentration antibacterial rinsing operation is executed.

When the user wants to execute the washing operation, he/she puts the laundry in the rotary tub 12, puts a required amount of detergent in the water injection case 20, and then operates the operation panel 5 to select, for example, an automatic course. At the same time, the execution of the high-concentration antibacterial rinsing operation is set, and the start key 44 is turned on. Then, as shown in FIG. 4, first, in step S1, a washing process is executed. Although detailed description is omitted, in this washing process, the amount of cloth is determined, the water level is set according to the amount of water, the water supply valve 19 is opened, and water is supplied up to the set water level based on the detection of the water level sensor 28. Done. Then, the rotary tank 12 is alternately rotated at a relatively low speed in the forward direction and the reverse direction at predetermined time intervals, and the circulation pump 24 is appropriately driven. When the washing process is completed, the drain valve 25 is operated to drain the water.

When the drainage after the washing step is completed, a detailed explanation is omitted, but in the next step S2, the rinsing 1 step, that is, the shower rinsing step is executed for a predetermined time. After this rinse 1, drainage is performed. In the next steps S3 to S12, the rinsing 2 stroke, that is, the rinsing stroke is executed. That is, the drain valve 25 is closed in step S3, and water supply is started in step S4. In step S5, it is determined whether or not the set water level has been reached, and when the set water level has not been reached yet (No in step S5), the process returns to step S4 and water supply is continued. When the set water level is reached (Yes in step S5), the water supply is stopped in step S6.

In the next step S7, the circulation pump 24 is operated, and in step S8, the stirring operation for rotationally driving the rotary tank 12 in the forward and reverse directions at a low speed is performed. The operations of the circulation pump 24 and the rotary tank 12 are continued for a required time (for example, about 10 minutes) (step S9). When the required time has elapsed (Yes in step S9), the operation of the circulation pump 24 is stopped in step S10, the stirring operation of the rotary tank 12 is stopped in step S11, and the rinsing 2 stroke ( The final rinsing process) ends. In the present embodiment, the next high-concentration antibacterial rinsing operation is performed while the washing water in the water tank 9 is left, but it may be drained once and then newly supplied.

Now, in steps S12 to S24, the high-concentration antibacterial rinsing operation is executed. That is, in step S12, it is determined whether or not the water level in the water tank 9 is the set water level for the high-concentration antibacterial rinse. The water level at this time is set to be lower than that in the case of rinsing. If it is different from the set water level (No in step S12), the water level is adjusted in step S13. The water level is adjusted by water supply or drainage. When the set water level is reached (Yes in step S12), water supply is stopped in step S14.

Then, in step S15, the warm water heater 16 is turned on to heat the wash water. At the same time, in step S16, the circulation pump 24 is driven, and in step S17, the rotary tank 12 is rotated at a low speed to perform the tank stirring operation. In step S18, it is determined based on the detection by the water temperature sensor 17 whether or not the temperature of the wash water in the water tub 9 has risen to a set temperature, in this case 40°C. If the temperature of the wash water in the water tub 9 has not reached the set temperature (No in step S18), the process from step S15 is repeated. During this period, as shown in FIG. 5, the operation of the circulation pump 24 and the stirring operation of the rotary tank 12 are intermittently performed, and the operation and the rest at regular time intervals are repeated. There is.

When the temperature of the wash water reaches the set temperature (Yes in step S18), the hot water heater 16 is turned off in step S19. Thereafter, in step S20, the circulation pump 24 is driven, and in step S21, the rotary tank 12 is rotated at a low speed to perform the tank stirring operation. As shown in FIG. 5, these operations are continuously performed for a predetermined time, for example, 5 minutes in total (step S22).

When the operation for the predetermined time is completed (Yes in step S22), the operation of the circulation pump 24 is stopped in step S23, the stirring operation of the rotary tank 12 is stopped in step S24, and the high-concentration antibacterial rinse operation is performed. Ends and the rinsing process ends. When the operation of the high-concentration antibacterial rinse is completed, the drain valve 25 is opened in step S25, and the dehydration process is executed in step S26. In the dehydration process, the rotating tub 12 is rotated in one direction at a high speed for a predetermined time, and the washing operation is completed.

As described above, by performing the high-concentration antibacterial rinsing operation, the circulation pump 24 is driven while the washing water in the water tank 9 is warm water at about 40° C. After passing through the antibacterial agent unit 22 inside, water is sprinkled toward the laundry in the rotary tub 12. At this time, when the wash water passes through the antibacterial agent unit 22, the antibacterial agent dissolves in the wash water. However, since the wash water is warm water, the antibacterial agent is more antibacterial than the case where normal temperature water is used. The agent will dissolve in high concentration.

Here, FIG. 6 shows the results of examining the temperature dependence of the degree of dissolution of the antibacterial agent called antibacterial glass used in the present embodiment. The horizontal axis represents the water temperature, and the vertical axis represents the amount of decrease in the mass of the antibacterial agent after keeping 22.2 g of the antibacterial agent for 24 hours while maintaining 100 ml of purified water at each temperature. The result is that the decrease amount, that is, the solubility increases proportionally. While the mass reduction amount was 0.0363 g when the water temperature was 20° C. at room temperature, when the water temperature was 40° C., the mass reduction amount was 0.0703 g, which was 1.9 at room temperature. The amount of dissolution will be twice (about twice).

As a result, in the present embodiment, in the high-concentration antibacterial rinsing operation, the antibacterial agent is dissolved in the hot water at a concentration twice as high as that in the normal temperature, and the concentration of the antibacterial agent is higher than that of the laundry. Can be soaked with antibacterial agents. Therefore, the antibacterial effect in the laundry after the washing operation can be further enhanced, and the generation of odor due to the propagation of various bacteria can be effectively prevented. It should be noted that if the temperature of the hot water is made higher, the dissolution concentration of the antibacterial agent can be made higher by that much. However, considering that the user touches the hot water, etc. It is considered that it is desirable to set the temperature to about °C.

As described above, according to this embodiment, the following effects can be obtained. In the washing machine 1 of the present embodiment, in the rinsing process, the circulating pump 24 is driven by the warm water heater 16 to heat the washing water in the water tub 9 to sprinkle water on the laundry in the rotary tub 12 with high concentration. The antibacterial rinsing operation can be executed. As a result, by performing the high-concentration antibacterial rinsing operation, the high-concentration antibacterial agent can be impregnated into the laundry, and the antibacterial effect can be further enhanced. As a result, it is possible to obtain an excellent effect that it is possible to execute a laundry operation having a high antibacterial effect on the laundry.

In particular, in the embodiment, the high-concentration antibacterial rinsing operation is performed after the rinsing operation (trial rinsing) is performed while the washing water in the water tank 9 is at the predetermined water level. As a result, the heating time can be shortened with a relatively low water level, that is, a small amount of water. At the same time, by driving the circulation pump 24 for a certain period of time, water containing a high-concentration antibacterial agent can be permeated into the laundry and a sufficient antibacterial effect can be obtained.

In addition, since the high-concentration antibacterial rinsing operation is performed after the final rinsing, the washing process should be completed with the water containing the high-concentration antibacterial agent being allowed to penetrate the laundry. Therefore, the effect of the high-concentration antibacterial agent can be fully enjoyed. Further, in the present embodiment, in the high-concentration antibacterial rinsing operation, the rotary tub 12 is rotationally driven to perform the stirring operation of the laundry at the same time. The agent can be soaked in, making it even more effective.

(2) Second Embodiment and Other Embodiments FIGS. 7 and 8 show the second embodiment. The difference from the first embodiment is that the controller 8 executes It is in the operation content of the concentration antibacterial rinsing operation. In the second embodiment, the control device 8 omits the processing operation of steps S20 to S22 in the first embodiment (FIG. 5).

That is, in the present embodiment, after the rinsing 2, when the high-concentration antibacterial rinsing operation is started from step S12, the wash water in the water tank 9 is at the set water level (steps S12 to S14), and the warm water is supplied. The heater 16 is turned on to heat the wash water (step S15). At the same time, the circulation pump 24 is driven and the rotary tank 12 is rotated at a low speed to perform the tank stirring operation (steps S16 and S17). In step S18, it is determined whether or not the temperature of the wash water in the water tub 9 has risen to a set temperature, for example 40°C. If the set temperature has not been reached (No in step S18), the processing from step S15 is repeated.

When the temperature of the wash water reaches the set temperature (Yes in step S18), the hot water heater 16 is turned off as shown in FIG. 8 (step S19). At the same time, the operation of the circulation pump 24 is stopped in step S23, the stirring operation of the rotary tank 12 is stopped in step S24, and the high-concentration antibacterial rinse operation is completed. After that, drainage is performed (step S25), a dehydration process is executed (step S26), and the washing operation ends.

According to the second embodiment, similarly to the first embodiment, by performing the high-concentration antibacterial rinsing operation, the laundry can be impregnated with the high-concentration antibacterial agent, and the antibacterial effect is obtained. Can be further enhanced. As a result, it is possible to obtain an excellent effect that it is possible to execute a laundry operation having a high antibacterial effect on the laundry. Further, since the high-concentration antibacterial rinsing operation is ended when the temperature of the washing water reaches the set temperature, the time required for the high-concentration antibacterial rinsing operation can be relatively short.

Although not shown, it is possible to configure as other embodiments described below. That is, although the drum type washing machine 1 is applied in the above-described embodiment, the washing machine is not limited to the drum type washing machine, and the central axis of the water tub and the rotary tub is vertically oriented, that is, a so-called vertical type. It can also be applied to washing machines. In this case, using the pump blades provided integrally with the pulsator at the bottom of the rotary tub, the washing water in the water tub is pumped up, and the side wall of the water tub is sprinkled from the upper part of the rotary tub through the flow path extending upward. By providing a hot water heater or an antibacterial agent in the structure for performing the above, the same operation as in the above-described embodiments can be performed. In this configuration, the laundry can be stirred by driving the pulsator.

Further, in each of the above-described embodiments, the high-concentration antibacterial rinse operation is configured to be executed by the user's operation of the operation setting key. However, the high-concentration antibacterial rinse operation is incorporated in the automatic washing operation course. Alternatively, the high-concentration antibacterial rinsing operation may be executed each time the course is executed. In addition, the water temperature such as a predetermined temperature and the specific values of the time such as the drive time of each part are merely examples, and can be appropriately changed, and various values can be used without departing from the gist. It can be modified and implemented.

In the drawings, 1 is a washing machine, 2 is an outer box, 5 is an operation panel, 8 is a control device (control means), 9 is a water tank, 12 is a rotating tank (washing tank), 16 is a hot water heater, 17 is a water temperature sensor, Reference numeral 21 is an in-machine drainage hose (circulation path), 22 is an antibacterial agent unit, 24 is a circulation pump, and 27 is a circulation hose (circulation path).

Claims (3)

A wash tub in which laundry is stored and where the washing and rinsing steps are carried out,
A hot water heater for heating the washing water in the washing tub to make it warm;
A circulation pump for spraying the washing water in the washing tub while circulating it through the circulation path toward the laundry in the washing tub,
An antibacterial agent that is disposed in the circulation path and has a slow solubility in water,
In the rinsing process, the hot water heater controls the circulating pump to drive a high-concentration antibacterial rinse operation of spraying water to the laundry in the washing tub while the washing water in the washing tub is heated. And means
The control means performs the high-concentration antibacterial rinse operation after the final rinse operation in the rinse step,
The washing machine in which the high-concentration antibacterial rinsing operation is performed by heating the washing water in a range of 35°C to 45°C at a predetermined water level lower than that in the case of rinsing. Wherein, in the state of the washing water is a predetermined water level before Symbol wash tank, wherein the washing water is heated by the hot water heater, by the circulation pump is driven a predetermined time to perform a high concentration antibacterial rinsing operation The washing machine according to item 1. The laundry according to claim 1 or 2, wherein the control means performs the high-concentration antibacterial rinse operation by stirring the laundry in the washing tub in addition to driving the hot water heater and the circulation pump. Machine.

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