JP2012061160A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dishwasher for suppressing the generation of noise during a draining operation as much as possible.SOLUTION: During the draining operation in which a control means H performing washing processing to wash an object to be washed inside the washing space Q of a washing tub D, rinsing processing to rinse the object, and drying processing to dry the object operates a draining pump 6 for sucking warm water from the bottom of the washing space and for draining the warm water to an external part, the draining pump 6 is operated by a set low draining ability, and then, the draining pump 6 is operated by a set high draining ability which is higher than the set low draining ability when the detection water level of a water level detection means J for detecting the water level of the warm water stored in the washing tub D is not changed even after a set stand-by time elapses.

Description

  The present invention is provided with a control means for executing a cleaning process for cleaning a cleaning object in a cleaning space of a cleaning tank, a rinsing process for the cleaning object, and a drying process for drying the cleaning object, When the control means discharges the hot water stored in the cleaning space, the dish washing is configured to execute a drainage operation that operates a drainage pump that sucks hot water from the bottom of the cleaning space and discharges it to the outside. Related to the machine.

Such dishwashers are used for washing dishes such as dishes and teacups.
That is, the dishwasher is used in various usage forms, and the standard use form is that hot water for washing is contained in the washing space in a state where the object to be washed is accommodated in the washing space. After performing the cleaning process of ejecting the hot water for cleaning as cleaning water from the cleaning nozzle equipped in the cleaning space, and then discharging the hot water stored in the cleaning space Waste water that supplies hot water for rinsing into the cleaning space, performs a rinsing process that ejects the hot water for rinsing from a cleaning nozzle equipped in the cleaning space, and then discharges the hot water stored in the cleaning space In this embodiment, after the operation is performed, the drying process is performed.

In such a dishwasher, the drainage operation for operating the drainage pump that draws hot water from the bottom of the washing space and discharges it to the outside is performed after the washing process and after the rinsing process as described above. (For example, refer to Patent Document 1).
In this patent document 1, the drainage operation is configured to be performed in such a manner that the operation of the drainage pump is stopped when a set time elapses after the drainage pump is operated.
By the way, there is no detailed explanation about the set time for operating the drain pump, but this set time is, for example, the time when the entire amount of hot water stored in the cleaning space can be discharged for the cleaning process or the rinsing process. Will be set.

JP-A-8-131391

  The usage time of the dishwasher is often at night for washing dishes after dinner, etc., and it is desirable to be quiet, but in conventional dishwashers, There is a possibility that noise may occur when performing drainage operation, and improvement has been desired.

That is, the drainage head when the drainage pump is operated to discharge hot water varies depending on the change in the installation form of the external connection hose extended from the dishwasher.
That is, an external connection hose is extended from the dishwasher in order to guide hot water discharged from the drainage pump to the outside, and the external connection hose is arranged in a state extending along the horizontal direction. In many cases, it is connected to the drainage pipe at the installation location where the dishwasher is installed, but depending on the installation location, the drainage pipe is located above, so the external connection hose extends upward. It may be installed and connected to the drain pipe at the installation location. Incidentally, when the external connection hose is disposed in a state of extending upward, the amount of rise may be about 1 meter when it is large.

Therefore, in order to ensure that hot water in the cleaning space can be discharged properly even if the drainage head fluctuates, the drainage capacity of the drainage pump is increased to a high drainage capacity that can drain hot water even when the drainage head is high. It will be determined.
However, in this case, since the drainage pump operates at a high drainage capacity even when the drainage head is low, the drainage pump operates at a high drainage capacity even when the drainage head is low. There is an inconvenience of generating sound.

By the way, when the drainage operation is performed in a form in which the operation of the drainage pump is stopped after the settling time has elapsed after the drainage pump is operated, the settling time for operating the drainage pump is set in the case where the drainage head is high. Also, the time is set so that the entire amount of hot water stored in the cleaning space can be properly discharged.
However, when setting the set time for cleaning drainage in this way, when the drainage head is small, the hot water stored in the cleaning space disappears long before the set time for cleaning drainage elapses. There is an inconvenience that a state where a large amount of noise is generated due to air biting in the pump occurs over a long period of time.

  This invention is made | formed in view of the said situation, The objective is to provide the dishwasher which can suppress generation | occurrence | production of the noise in drain operation as much as possible.

The dishwasher according to the present invention includes a control unit that performs a cleaning process for cleaning a cleaning object in a cleaning space of a cleaning tank, a rinsing process for the cleaning object, and a drying process for drying the cleaning object. Provided,
When the control means discharges hot water stored in the cleaning space, the control means is configured to execute a drainage operation that operates a drainage pump that sucks hot water from the bottom of the cleaning space and discharges it to the outside. The first characteristic configuration is
In the drain operation, the control means operates the drain pump at a set low drainage capacity, and then the detected water level of the water level detecting means for detecting the level of hot water stored in the washing tank has passed a set standby time. If it does not change, the drainage pump is configured to operate at a set high drainage capacity higher than the set low drainage capacity.

That is, when the drainage operation is performed, first, the drainage pump is operated to the set low drainage capacity, and then the water level that detects the level of the hot water stored in the washing tank until the set standby time elapses. When the detection water level of the detection means changes, the operation of the drainage pump is continued with the set low drainage capacity, and the hot water in the cleaning space is drained.
When the water level detection means for detecting the water level of the hot water stored in the washing tank does not change even after the set standby time has elapsed after the drain pump is operated to the set low drainage capacity, the set low drainage is set. The drainage pump is operated with a set high drainage capacity higher than the capacity, and hot water in the cleaning space is drained.

  In other words, after the drain pump is operated at the set low drainage capacity, the detected water level of the water level detecting means for detecting the level of the hot water stored in the washing tank changes until the set standby time elapses. Because the drainage head is low, even if the drainage pump is operated at the set low drainage capacity, the hot water in the cleaning space is properly drained, so continue to operate the drainage pump at the set low drainage capacity. Then, the hot water in the cleaning space is drained.

  And after operating the drainage pump at the set low drainage capacity, even if the set standby time has elapsed, the detection water level of the water level detection means for detecting the level of hot water stored in the washing tank does not change, Since the drainage head is high, even if the drainage pump is operated at the set low drainage capacity, the hot water in the cleaning space is not properly drained. When activated, the hot water in the cleaning space is drained.

  In this way, when the drainage head is low, the drainage pump is operated with a set low drainage capacity that does not generate a loud noise when activated, and only when the drainage head is high, the drainage pump is operated with the set high drainage capacity Since it is a thing, when performing drainage operation, it can suppress generating a loud sound as much as possible.

  In short, according to the first characteristic configuration of the present invention, it is possible to provide a dishwasher that can suppress the generation of noise during drainage operation as much as possible.

The second feature configuration of the present invention is in addition to the first feature configuration described above.
Hot water intermittent means for intermittently supplying hot water to the cleaning space is provided,
The water level detection means is configured to detect that hot water of a cleaning water level is stored in the cleaning space;
In the cleaning process and the rinsing process, the control means is configured to control the hot water intermittent means to store the hot water at the cleaning water level in the cleaning space for cleaning and rinsing, and The drainage operation is characterized in that an operation for discharging hot water at the cleaning water level stored in the cleaning space is performed.

  That is, in the cleaning process and the rinsing process, hot water at the cleaning water level is stored and cleaning and rinsing are performed, and after the cleaning process and the rinsing process, drainage operation is performed in the cleaning space. The stored hot water at the cleaning water level is discharged.

  The drainage operation is performed when the drainage pump is operated at the set low drainage capacity and then the detected water level of the water level detection means for detecting the level of hot water stored in the washing tank does not change even after the set standby time has elapsed. Since the drainage pump is operated with a high drainage capacity that is higher than the drainage capacity, the discharge of hot water at the cleaning water level is suppressed as much as possible after the cleaning and rinsing processes. Can be done in the state.

  In short, according to the second characteristic configuration of the present invention, in addition to the operational effects of the first characteristic configuration described above, it is possible to generate a loud sound after the cleaning process and the rinsing process to discharge the hot water at the cleaning water level. It is possible to provide a dishwasher that can be performed in a state in which it is suppressed as much as possible.

The third feature configuration of the present invention is in addition to the second feature configuration described above.
In the drainage operation, the control means is configured to operate the drainage pump when a detection water level of the water level detection means changes from the cleaning water level until a set time for cleaning drainage elapses from that point. It is characterized by that.

  That is, after the drainage pump is activated and the discharge of hot water in the cleaning space is started, if the detected water level of the water level detecting means for detecting the level of hot water stored in the cleaning space changes from the cleaning water level, the cleaning drainage from that point The drainage operation is performed in such a manner that the drainage pump is operated until the set time for use has elapsed.

Thus, when the detection water level of the water level detection means changes from the cleaning water level, the drainage operation is performed in a form in which the drainage pump is operated until the set time for cleaning drainage elapses from that point, While simplifying the configuration, the hot water at the cleaning water level can be discharged accurately.
That is, for example, when the water level detecting means detects that the amount of hot water stored in the cleaning space is an empty water level corresponding to a state close to the sky, and the water level detecting means detects the empty water level, Although it is conceivable to perform the drainage operation in such a form that the pump is stopped, in this case, there is a disadvantage that the configuration of the water level detection means becomes complicated in order to detect the air level, but such a disadvantage Can be avoided.

  In this way, when the detection water level of the water level detection means changes from the cleaning water level, the drainage operation is performed in such a manner that the drainage pump is operated until the set time for cleaning drainage elapses from that point. However, since the drainage capacity of the drainage pump is adjusted to the set low drainage capacity or the set high drainage capacity according to the drainage head, it is stored in the cleaning space until the set time for cleaning drainage elapses. Even if the hot water may run out, the timing of running out of the hot water can be controlled from greatly differing from the time when the set time for cleaning and drainage elapses. Even if there is, the state does not continue for a long time.

  In short, according to the third characteristic configuration of the present invention, in addition to the operational effects of the second characteristic configuration described above, hot water at the cleaning water level can be discharged accurately while simplifying the configuration, Even if air catching occurs in the drainage pump and noise is generated, it is possible to provide a dishwasher that can prevent the state from continuing for a long time.

In addition to any of the first to third feature configurations described above, the fourth feature configuration of the present invention includes:
By cooling the air in the cleaning space circulated by the ventilation means through the ventilation path extending from the air suction port to the cleaning space and the air supply port to the cleaning space by contact with hot water for dehumidification, A dehumidifying part configured to condense and dehumidify moisture in the air, and flow the dehumidified hot water and condensed water into the cleaning space; and a heating means for heating the air in the cleaning space. Provided,
The hot water intermittent means for interrupting the supply of hot water for dehumidification to the dehumidifying part is provided,
The water level detection means is configured to detect that hot water of a hot water increase water level is stored at the bottom of the cleaning space,
In the drying process, the control means heats the air in the cleaning space by the heating means, and brings the hot water for dehumidification and the air passing through the ventilation path into contact with each other. And the hot water intermittent means, and when the hot water to be stored at the bottom of the cleaning space in the drying operation becomes the hot water increase level as the drain operation, It is characterized by being configured to discharge hot water at an increased water level.

  That is, as the drying process, while the air in the cleaning space is heated by the heating means, the air passing through the ventilation path is cooled by contact with hot water for dehumidification, so that moisture in the air is condensed and dehumidified. When performing a drying process, moist air is not exhausted outside the machine, so moist air is present where users and dishwashers are installed. It is possible to suppress spraying on other devices, and the usability is improved.

Further, when performing the drying process, the hot water and condensed water after the dehumidifying process from the dehumidifying part is flowed into the cleaning tank, and the hot water stored at the bottom of the cleaning space in the cleaning tank becomes the hot water increase level, The drainage operation is repeated.
Incidentally, the hot water increased water level is determined to be a water level that does not immerse the object to be cleaned and the heating means in the cleaning tank.

In this way, hot water and condensed water after dehumidifying treatment from the dehumidifying part are flowed into the washing tank and discharged to the outside using the drain pump, so using the discharge capacity of the drain pump, The hot water and condensed water after the dehumidifying treatment from the dehumidifying section can be accurately discharged to the outside.
In other words, using the drainage pump provided to discharge hot water stored in the cleaning space for cleaning and rinsing, discharge hot water and condensed water from the dehumidifying section to the outside Therefore, the hot water and the condensed water after the dehumidifying treatment from the dehumidifying part can be accurately discharged to the outside with a simple configuration that effectively uses the original configuration.

  In addition, when the hot water stored at the bottom of the cleaning space in the cleaning tank reaches the level of increased hot water, the drainage operation for drying is repeated.For example, during the drying process, After dehumidifying from the dehumidifying part that flows into the washing tank while continuously operating the drain pump with the discharge capacity that matches the flow rate per unit time that the hot water and condensed water after dehumidifying flow into the washing tank The running cost can be reduced as compared with the case where the hot water and condensed water are continuously discharged.

  Furthermore, the drainage operation, when the drainage pump is operated at the set low drainage capacity, and then the detected water level of the water level detecting means for detecting the water level of the hot water stored in the washing tank does not change even after the set standby time has elapsed, Since the drainage pump is operated with a set high drainage capacity that is higher than the set low drainage capacity, it is possible to discharge hot water at a hot water discharge level while suppressing the generation of loud noises as much as possible. .

  In short, according to the fourth characteristic configuration of the present invention, in addition to the operational effects of any of the first to third characteristic configurations, moist air is not discharged outside the apparatus, and is in a state that is easy to use. In addition, the hot water and the condensed water after the dehumidifying treatment that occurs in the drying process can be performed in a simple configuration that effectively uses the original configuration, and in a form that reduces the running cost, It is possible to provide a dishwasher that can be discharged to the outside accurately, and in addition, the hot water and condensed water after the dehumidifying treatment can be discharged in a state where generation of loud noise is suppressed as much as possible.

In addition to the fourth feature configuration, the fifth feature configuration of the present invention includes:
In the drainage operation, the control means is configured to operate the drainage pump until a set time for dry drainage elapses from that point when the detected water level of the water level detection means changes from the hot water increased water level. It is characterized by that.

  In other words, after starting the drainage of hot water in the cleaning space by operating the drain pump, if the detected water level of the water level detecting means for detecting the level of hot water stored in the cleaning space changes from the hot water increased water level, dry drainage from that point The drainage operation is performed in such a manner that the drainage pump is operated until the set time for use has elapsed.

In this way, when the detected water level of the water level detecting means changes from the hot water increased water level, the drainage operation is performed in a form in which the drainage pump is operated until the set time for dry drainage elapses from that point, Hot water at the hot water discharge water level can be discharged accurately while simplifying the configuration.
That is, for example, when the water level detecting means detects that the amount of hot water stored in the cleaning space is an empty water level corresponding to a state close to the sky, and the water level detecting means detects the empty water level, Although it is conceivable to perform the drainage operation in such a form that the pump is stopped, in this case, there is a disadvantage that the configuration of the water level detection means becomes complicated in order to detect the air level, but such a disadvantage Can be avoided.

  In this way, when the detected water level of the water level detecting means changes from the hot water increased water level, the drainage operation is performed in such a manner that the drainage pump is operated until the set time for dry drainage elapses from that point. However, since the drainage capacity of the drainage pump is adjusted to the set low drainage capacity or the set high drainage capacity according to the drainage head, it is stored in the washing space until the set time for dry drainage elapses. Even if the hot water may run out, the timing of the running out of hot water can be controlled from greatly differing from the time when the set time for dry drainage elapses. Even if there is, the state does not continue for a long time.

  In short, according to the fifth characteristic configuration of the present invention, in addition to the operational effect of the fourth characteristic configuration described above, the hot water at the level of the hot water discharge water level can be accurately discharged while simplifying the configuration, Even if air catching occurs in the drainage pump and noise is generated, it is possible to provide a dishwasher that can prevent the state from continuing for a long time.

In addition to any of the first to fifth feature configurations described above, the sixth feature configuration of the present invention includes:
The air supply port and the air supply port are formed at lower positions in the side wall portion of the cleaning space,
The ventilation path is configured in an inverted U shape including an upward path portion extending upward from the air suction port and a downward path portion extending downward from the upper end portion of the upward path portion toward the air supply port. ,
The dehumidifying part is
Ejecting means for ejecting dehumidified hot water downward with respect to the air passing through the ascending path portion in the ventilation path, and air venting the ascending path portion upward by the ejecting means. It is configured to dehumidify by condensing moisture in the air by cooling with contact with dehumidified hot water sprayed downward, and the dehumidified hot water and condensed hot water are the air. It is characterized by being configured to flow into the cleaning space through a suction port.

  That is, the air suction port and the air supply port are formed at lower positions in the side wall portion of the cleaning space, and the ventilation path extends from the air suction port to the upper side and the upper end portion of the lift path portion. Since it is configured in an inverted U shape including a downward path portion extending downward toward the air supply port, it is possible to suppress clogging of leftovers in the cleaning space in the ventilation path.

  In addition, there is a risk that leftovers attached to the object to be cleaned may be scattered in the ventilation path through the air suction port or air supply port during the rinsing process or the rinsing process. The air suction port extends in the vertical direction with the air suction port positioned at the lowest position, and the descending path portion extends in the vertical direction with the air supply port positioned at the lowest position. The scattered leftovers do not move to the upper side of the ventilation path, and the leftovers scattered in the ventilation path fall into the washing space by their own weight and return to the washing space. It becomes possible to suppress the clogging of vegetables in the ventilation path.

  In addition, since the air suction port and the air supply port are formed at lower positions in the side wall portion of the cleaning space, the air flow path configured in an inverted U shape composed of the ascending path part and the descending path part is used as the air path. Ventilation means and dehumidifying parts that can be easily caught by leftovers can be formed from the location where the suction port and the air supply port are formed, and greatly upward from the air suction port and the air supply port. It can arrange | position in a distant position, and can make it easy to avoid that the vegetables left in the ventilation path penetrate | invade and adhere to a ventilation means or a dehumidification part.

  Then, the dehumidifying section causes the dehumidifying water to be ejected downward by the ejecting means with respect to the air passing upward through the ascending path portion by the ventilation operation of the ventilating means, and the air passing upward through the ascending path portion. Since the water in the air is condensed by being cooled by contact with the dehumidifying water that ejects the air, it is possible to dehumidify the air in the cleaning space while reducing the amount of the dehumidifying water used.

  In other words, since the air passing upward and the dehumidifying water ejected downward by the ejecting means are brought into contact with each other to condense moisture in the air, the dehumidifying hot water to be ejected is The dehumidifying hot water that is sprayed downward and in contact with the air before dehumidification that is vented upward will be sequentially contacted while moving in the opposite direction. The state where hot water for hot water comes into contact with air and condenses moisture in the air continues over a long region.

  As a result, when performing the drying process, it is possible to dehumidify the air in the cleaning space while reducing the amount of hot water used for dehumidification.

  Therefore, according to the sixth feature configuration of the present invention, in addition to the operational effects of any of the first to fifth feature configurations, it is avoided that the leftovers scattered in the cleaning process and the rinsing process are clogged in the ventilation path. In addition, it is possible to provide a dishwasher that can be used satisfactorily over a long period of time and that can dehumidify the air in the washing space while reducing the amount of hot water used for dehumidification. .

Perspective view of dishwasher Notched side view with the cleaning tank stored The perspective view which looked at the washing tank which removed the front door from the front side Perspective view of the cleaning tank as seen from the back Schematic diagram of dishwasher Schematic perspective view showing the flow state of drying air Notched perspective view of water level detection sensor Perspective view of the sensor Perspective view of the sensor Longitudinal side view of detection state of hot water discharge water level and hot water increase water level Longitudinal side view of cleaning water level detection state Vertical side view of abnormal water level detection Float perspective view Block diagram showing control configuration Flow chart showing control operation Flow chart showing control operation Flow chart showing control operation

Embodiment
Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1 to FIG. 4, a main body 1 is provided as a main body case with an opening on the front surface, and a drawer 2 including a cleaning tank D having a square shape in plan view is provided on the main body 1. On the other hand, the drawer-type dishwasher as an example of the dishwasher is provided so that it can be pulled out and stored along the horizontal direction.
Although not illustrated, a slide-type rail mechanism is provided that supports the drawer portion 2 so as to be movable with respect to the main body portion 1, and the drawer portion 2 exposes most of the main body portion 1 to the outside. It is configured so that it can be pulled out to the state.

The inner lid 3 that closes the upper surface of the cleaning tank D when the drawer 2 is housed in the main body 1 opens the upper surface of the cleaning tank D when the drawer 2 is pulled out from the main body 1. Thus, it is provided in a form that is automatically opened and closed as the drawer part 2 is pulled out and stored, and an openable and closable cleaning space Q is configured in the internal space of the cleaning tank D.
As shown in FIG. 2, a drain pan 14 for receiving water leakage is provided at the bottom of the main body 1. Although not illustrated, the presence or absence of water received and collected by the drain pan 14 is detected. It will be equipped with a leak sensor.

The front part of the drawer part 2 is provided with a door body A that opens and closes the opening of the front part of the main body part 1, and the door body A is gripped when the drawer part 2 is pulled out from the main body part 1 or stored. A holding part B is provided. Although not described in detail, an engaging means P that engages with the engaging portion Pa of the main body 1 as the drawer 2 is housed in the main body 1 is provided at the inner side portion of the grip B. When the engaging means P is engaged with the engaging portion Pa, the drawer portion 2 is held in the state of being housed in the main body portion 1. Then, the engaging means P can be operated in a released state in which the engagement is released with the fingers supporting the gripping part B when the drawer part 2 is pulled out from the main body part 1.
Further, the door body A is provided with an operation unit SS for performing various operations for driving.

As shown in FIG. 5, a water supply channel 4A connected to a water supply source such as a water supply, a washing tank branch channel 4B branched from the water supply channel 4A, and a dehumidifying branch channel 4C branched from the water supply channel 4A are provided. Is provided.
The washing tank branch 4B is connected to a water supply port 5 for supplying hot water for cleaning and rinsing into the washing space Q of the washing tank D, and the dehumidifying branch 4C is connected to the front side wall Df of the washing tank D. It is connected to a dehumidifying part G to be described later.

  The first on-off valve V1 that opens and closes the water supply path 4A, the second on-off valve V2 that opens and closes the washing tank branch path 4B, and the dehumidification branch path 4C are equipped with the first on-off valve V1 and the second on-off valve. A constant flow valve V3 for limiting the flow rate of hot water flowing through the dehumidification branch 4C to be smaller than the flow rate of hot water flowing through the washing tank branch 4B in the open state of the on-off valve; Hot water / interrupting means E, which is provided and performs intermittent connection of hot water supply to the water supply port 5 and intermittent supply of hot water to the dehumidifying part G from the first open / close valve V1, the second open / close valve V2, and the constant flow valve V3. Is configured.

That is, when hot water is supplied to the cleaning space Q, the first on-off valve V1 and the second on-off valve V2 are opened, and when hot water is supplied only to the dehumidifying section G, the first on-off valve V1 is opened. As a result, the second on-off valve V2 is closed.
The first on-off valve V1 has a flow rate of hot water flowing through the washing tank branch 4B sufficiently higher than a flow rate of hot water flowing through the dehumidification branch 4C (for example, 200 ml / min). Although it is a large flow rate, a constant flow valve V4 that restricts the excessive flow rate to be suppressed is provided in a state of being integrally incorporated.

  In addition, a first on-off valve V1, a second on-off valve V2, and a constant flow valve V3 are arranged at the back side portion of the main body 1, and the second on-off valve V2 and the water supply port 5 in the washing tank branch 4B. Are connected by a flexible hose R1, and a portion connecting the constant flow valve V3 and the dehumidifying part G in the dehumidifying branch 4C is formed by a flexible hose R2.

  Further, as shown in FIGS. 2 and 5, a dual-purpose pump 6 that functions as a cleaning pump in the forward direction and functions as a drainage pump in the reverse direction is provided below the bottom of the cleaning tank D in the drawer 2. In the cleaning space Q of D, a cleaning nozzle 8 and an electric heater 9 as a heating means are arranged, and a cleaning basket 10 for storing and placing an object to be cleaned such as tableware is a cleaning tank. It is detachably mounted inside D.

The dual-purpose pump 6 is connected to a water storage recess S formed at the bottom of the cleaning tank D by a suction pipe 11 and a drain pipe 12 is connected thereto.
That is, in the forward rotation state, the dual-purpose pump 6 pumps hot water stored at the bottom of the cleaning space Q to the cleaning nozzle 8 and jets hot water from the cleaning nozzle 8. In the reverse rotation state, The hot water stored in the cleaning space Q is discharged to the outside through the drain pipe 12.

The configuration for discharging hot water to the outside will be described. The drain pipe 12 is provided in the drawer 2, the drain trap 12 </ b> B is disposed at the back side portion of the main body 1, and the tip of the drain pipe 12. The drainage trap 12B is connected by a drainage hose 12A, and an external connection hose 12C is connected to the drainage trap 12B.
Therefore, the external connection hose 12C is connected to the drain pipe of the installation location equipped in the location where the dishwasher is installed, so that hot water in the cleaning space Q can be drained to the outside.
When the drain pipe at the installation location is arranged at a low position, the external connection hose 12C is arranged in a state extending in the horizontal direction, but the drain pipe at the installation location is arranged at a high position. In this case, the external connection hose 12C is disposed in a state of extending upward, and as a result, the drainage head when the hot water in the cleaning space Q is discharged changes.

Further, as shown in FIG. 5, a water level detection sensor J as a water level detection means is connected to the water storage recess S through a guide tube 13 as a communication path.
As will be described later, the water level detection sensor J stores the water level in the cleaning space Q of the cleaning tub D in the cleaning space Q of the cleaning tub D and the water level Y2 (see FIG. 11). The level of the hot and cold water to be discharged corresponds to a state in which most of the hot water is discharged from the cleaning space Q, and the hot water discharge level Y1a (see FIG. 10) is low enough to expose the heater 9, and the cleaning tank It is configured to detect that the hot water stored in D is an abnormal water level Y3 (see FIG. 12) that is higher than the cleaning water level Y2 by a set amount.
Further, as shown in FIG. 10, the water level detection sensor J is configured to detect a hot water increased water level Y1b in which the hot water level has changed from a hot water discharge water level Y1a to a slightly higher water level, the details of which will be described later.

As shown in FIGS. 2, 3 and 5, of the four side walls forming the cleaning space Q in the cleaning tank D, the front side wall Df corresponding to the front side of the machine body, that is, the front side of the drawer part, A drying unit K is attached.
That is, as shown in FIG. 6, the air supply port 21 that supplies the air from the drying unit K to the cleaning space Q and the drying unit K suck the air in the cleaning space Q into the front side wall portion Df. The air suction port 22 is formed at a position corresponding to the lower side of the cleaning space Q and at positions separated on both the left and right sides. Specifically, the air supply port 21 and the air suction port 22 are formed so as to be positioned below the cleaning basket 10 and above the above-described water storage recess S, and in this embodiment, Has the air supply port 21 on the right side and the air suction port 22 on the left side.

The drying unit K circulates the air in the cleaning space Q through the ventilation path F extending between the air suction port 22 and the air supply port 21 inside the casing 20 fixed to the front side wall portion Df of the cleaning tank D. And the above-mentioned dehumidifying part G for dehumidifying the air circulated through the ventilation path F.
The ventilation path F has an inverted U-shape composed of an ascending path part f1 extending upward from the air suction port 22 and a descending path part f2 extending downward from the upper end of the ascending path part f1 toward the air supply port 21. The dehumidifying part G is disposed in the ascending path part f1, and the circulation fan 23 is disposed in the descending path part f2.

The dehumidifying part G includes a plurality of heat transfer plates 24 juxtaposed at intervals along the plate thickness direction and ejects hot water for dehumidification from the ejection nozzle 25 toward the heat transfer plates 24. The air flowing upward through the heat transfer plates 24 is cooled by contact with dehumidification water flowing down the surface of the heat transfer plate 24 and contact with dehumidification water flowing down between the heat transfer plates 24. Thus, the moisture in the air is condensed and dehumidified.
The dehumidified hot water and condensed hot water ejected from the ejection nozzle 25 flow into the cleaning space Q of the cleaning tank D through the air suction port 22 and are stored in the water storage recess S.

  Then, in a state where the electric heater 9 is heated, the circulation fan 23 is ventilated and hot water for dehumidification is ejected from the ejection nozzle 25, so that the air sucked from the cleaning space Q is supplied to the dehumidifying part G. After the dehumidification, the drying air is supplied to the cleaning space Q as drying air, and the supplied air is heated by the electric heater 9 to dry the cleaning object in the cleaning space Q. It is configured to do so.

  Further, the odor in the air sucked from the cleaning space Q is obtained by performing the ventilation operation of the circulation fan 23 and the ejection operation of hot water for dehumidification from the ejection nozzle 25 with the electric heater 9 stopped. The components are absorbed in dehumidifying water by the dehumidifying unit G and then supplied to the cleaning space Q so that a deodorizing operation for deodorizing the cleaning space Q can be performed.

The air flow in the drying operation will be described. As shown in FIG. 6, the air supplied to the cleaning space Q from the air supply port 21 formed in the front side wall portion Df of the cleaning tank D rises as a main flow. While flowing toward the rear side wall, and then moving downward toward the air suction port 22 formed on the lower side of the front side wall Df and at a position separated from the air supply port 21 in the left-right direction. It flows and flows in a form discharged from the air suction port 22, and air easily flows also to a lower portion of the cleaning tank where the air suction port 22 is located.
Therefore, it is possible to shorten the drying time by allowing air to flow through the entire cleaning object in the cleaning tank and drying the cleaning object efficiently.

As shown in FIG. 5, the drawer unit 2 is equipped with a control unit H as a control means for controlling operation.
Then, as shown in FIG. 14, the control unit H, based on a command input from the operation unit SS, a DC motor 6a that drives the dual-purpose pump 6, an electric heater 9, a circulation fan 23, and The operation of the hot water intermittent means E is controlled to perform a cleaning operation as a cleaning process for cleaning the cleaning object in the cleaning space Q formed inside the cleaning tank D, and a rinsing process for rinsing the cleaning object. From the rinsing operation, the drainage operation as a drainage treatment for draining hot water stored in the cleaning space Q of the cleaning tank D, the ventilation operation of the circulation fan 23 and the ejection nozzle 25 in a state where the electric heater 9 is heated. In the drying operation as a drying process for performing the dehumidifying hot water jetting operation and the electric heater 9 being stopped, the circulation fan 23 is ventilated and the dehumidifying hot water from the jet nozzle 25 is used. It is configured to perform deodorization operation of a deodorizing process to perform the ejection operation.

In FIG. 14, 6A is a DC motor drive circuit that adjusts the drive voltage applied to the DC motor 6a that drives the dual-purpose pump 6. The drive voltage of the DC motor 6a is adjusted to a command voltage commanded from the control unit H. Is configured to do.
L1 is an alarm lamp provided in the operation unit SS, L2 is an alarm buzzer built in the operation unit SS, L3 is a display unit provided in the operation unit SS, these alarm lamp L1, alarm buzzer L2, and In the display portion L3, the alarm means L that operates when an abnormality occurs is configured. Incidentally, a code corresponding to the content of the abnormality that has occurred is displayed on the display unit L3.
In FIG. 14, N is a storage switch that detects that the drawer 2 is stored in the storage position of the main body 1, 9 A is a drive circuit for the heater 9, and 23 A is a drive voltage for the circulation fan 23. It is the drive fan drive circuit to adjust.

Next, the operation performed by the control unit H will be described. Note that the operation unit SS is operated in the order of the cleaning operation, the rinsing operation, the drying operation, and the deodorizing operation, or the drying only course for operating only the drying operation. In addition, in the present embodiment, it is configured such that a standard driving course, a careful driving course, a speedy driving course, and a fast driving course can be selected as a continuous driving course. Will explain only the standard driving course of the continuous course.

A control operation of the control unit H will be described based on the flowchart of FIG.
First, the storage switch N detects that the drawer 2 is stored in the storage position of the main body 1 (# 1), the power switch of the operation unit SS is turned on (# 2), and the driving course is selected. When the start switch of the operation unit SS is turned on (# 4), the selected driving course is executed.

Hereinafter, the description will be continued assuming that the standard operation course of the continuous course is selected and the start switch of the operation unit SS is turned ON.
After the operation unit SS start switch is turned ON, first, the cleaning operation (# 5) and the drainage operation (# 6) after the cleaning operation are executed, and then the rinsing operation (# 7) and the rinsing operation. The subsequent drain operation (# 8) is executed. Then, it is determined whether or not the rinsing operation has been completed twice (# 9). If the rinsing operation has not been completed twice, the rinsing operation (# 7) and the drain operation (# 8) after the rinsing operation are performed. Will be executed again.

  If it is determined in # 9 that the rinsing operation has been completed twice, the heating rinsing operation (# 10) and the drainage operation (# 11) after the heating rinsing operation are executed, followed by the drying operation (# 12). ) And deodorizing operation (# 13) are sequentially executed.

  In the washing operation, first, the first on-off valve V1 and the second on-off valve V2 are opened, and hot water is supplied into the washing space Q from the water supply port 5 through the water supply passage 4A and the washing tank branch passage 4B. Then, hot water is supplied to the dehumidifying part G through the dehumidifying branch 4C, and hot water is supplied from the dehumidifying part G into the cleaning space Q through the air suction port 22. When the water level detection sensor J detects that the water level in the cleaning space Q has reached the cleaning water level Y2, the first on-off valve V1 and the second on-off valve V2 are closed to supply hot water to the cleaning space Q. Stop supplying.

Thereafter, the cleaning operation of spraying the cleaning water from the cleaning nozzle 8 toward the object to be cleaned is performed until the set time for the cleaning operation elapses by operating the dual-purpose pump 6 in the forward direction and operating the heater 9. Become.
In addition, before the user turns on the start switch of the operation unit SS, the cleaning detergent can be put into the cleaning tank D to perform cleaning using the detergent.

  In the drainage operation after the cleaning operation, the dual-purpose pump 6 is operated in reverse to drain the hot water in the cleaning tank D until the set time for cleaning drainage (for example, 20 seconds) elapses. Details thereof will be described later.

In the rinsing operation, when hot water is supplied to the cleaning space Q and the cleaning water level Y2 is detected by the water level detection sensor J, the supply of hot water is stopped as in the above-described cleaning operation.
Thereafter, the dual-purpose pump 6 and the heater 9 are operated to rinse the object to be cleaned with the rinse water heated by the heater 9 until the set time elapses.

  In the drain operation after the rinsing operation, a set time (for example, 20 seconds) elapses in the drain operation in which the dual-purpose pump 6 is reversely operated to drain the hot water in the cleaning tank D in the same manner as the drain operation after the cleaning operation. Will do until you do.

In the heating rinse operation, when hot water is supplied to the cleaning space Q and the cleaning water level Y2 is detected by the water level detection sensor J, the hot water supply is stopped as in the above-described cleaning operation.
Thereafter, the dual-purpose pump 6 and the heater 9 are operated, and the object to be cleaned is rinsed with the rinse water heated by the heater 9, and the temperature of the rinse water is set by the temperature sensor (not shown). When the set temperature for finishing (for example, 67 ° C.) is reached, the heating rinsing operation is terminated.

  In the drainage operation after the heating rinse operation, the drainage operation for draining the hot water in the cleaning tank D by reversely operating the dual-purpose pump 6 in the same manner as the drainage operation after the cleaning operation has a set time (for example, 20 seconds). It will be done until it passes.

In the drying operation, while the electric heater 9 is heated, the circulation fan 23 is ventilated and the dehumidifying hot water is ejected from the ejection nozzle 25. This state is set for drying. Continue until time (eg, 25 minutes) has elapsed.
During the drying operation, when the water level detection sensor J detects that the above-described increased hot water level Y1b, the drainage operation for drying is performed.
The drainage operation for drying is performed until the set time (20 seconds) elapses, and the drainage operation for draining by reversing the combined pump 6 will be described in detail later.

In this embodiment, the detection of the increased hot water level Y1b by the water level detection sensor J does not detect the state in which the water level detection sensor J detects the hot water discharge water level Y1a. It means that the state has changed.
That is, in the present embodiment, as described later, since the lowest water level that can be detected by the water level detection sensor J is the hot water discharge water level Y1a, the water level detection sensor J does not detect the hot water discharge water level Y1a. In other words, the detection of the hot water increased water level Y1b means that hot water at a level slightly higher than the hot water discharge water level Y1a is stored at the bottom of the cleaning space Q.

  Incidentally, when the lowest water level in the range that can be detected by the water level detection sensor J is configured to be lower than the hot water discharge water level Y1a, the water level detection sensor J has detected the hot water discharge water level Y1a, It can be assumed that hot water of a water level corresponding to the hot water increased water level Y1b is stored at the bottom of the cleaning space Q. That is, the hot water discharge water level Y1a can be used as the hot water increase water level Y1b.

In the deodorizing operation, with the electric heater 9 stopped, the circulation fan 23 is ventilated and the ejection nozzle 25 is ejected with dehumidifying water. Repeat until it has passed.
During the deodorizing operation, when the hot water level Y1b is detected by the water level detection sensor J, the deodorizing drainage operation is performed as in the case of the drying operation.
This deodorizing drainage operation is performed until the set time (for example, 20 seconds) elapses, as is the case with the drying drainage operation.

  Although not illustrated in the flowchart of FIG. 16, the control unit H is more than the hot water supply amount per unit time supplied to the cleaning space Q through the water supply channel 4A, the cleaning tank branch channel 4B, and the dehumidification branch channel 4C. The dual-purpose pump 6 is configured to operate in a state where the amount of drainage per unit time is increased, and the first on-off valve V1 and the second on-off valve V2 are opened in the cleaning operation and the rinsing operation. When the hot water is supplied to the cleaning space Q of the cleaning tank D and the abnormal water level Y3 is detected by the water level detection sensor J, the first on-off valve V1 and the second on-off valve V2 are closed, and It is comprised so that the water leakage prevention driving | operation process which operates the combined use pump 6 for waste_water | drain may be performed.

When the water level detection sensor J detects that the water level is lower than the cleaning water level Y2 when the water leakage prevention operation process is being executed, the control unit H stops the combined pump 6. The water leakage prevention operation process is configured to be stopped.
Incidentally, when the water level detection sensor J detects that the water level is lower than the cleaning water level Y2, the water level detection sensor J does not detect the cleaning water level Y2 from the state in which the cleaning water level Y2 is detected. When it changes to a state.

  Moreover, in this embodiment, the control part H performs the drain operation (henceforth a 1st drain operation) performed after each of washing | cleaning operation, a rinse operation, and a heating rinse operation, a drying operation, and a deodorizing operation. In the drainage operation (hereinafter referred to as the second drainage operation) performed at, when the dual-purpose pump 6 is operated at the set low drainage capacity and then the detected water level of the water level detection sensor J does not change even after the set standby time has elapsed, The dual-purpose pump 6 is configured to operate with a set high drainage capacity higher than the set low drainage capacity.

In the present embodiment, the drainage capacity of the dual-purpose pump 6 is adjusted by changing the rotational speed of the DC motor 6a.
That is, the control unit H sets the dual-purpose pump 6 to the set low discharge capacity or the set high discharge based on the detection information of the rotation speed sensor M (see FIG. 14) as the rotation speed detection means for detecting the rotation speed of the dual-purpose pump 6. In order to drive at a target rotational speed corresponding to the capacity, a drive voltage supplied to the DC motor 6a is obtained by proportional integral control, and the drive voltage is commanded to the DC motor drive circuit 6A as a command voltage. Hereinafter, it is configured to execute FB control.

Further, in the present embodiment, the first target rotation speed corresponding to the set low drainage capacity and the second target rotation speed corresponding to the set high drainage capacity have different values in the first drainage operation and the second drainage operation. Is set.
That is, in the washing operation, the rinsing operation, and the heating rinsing operation, the operation sound of the dishwasher is loud due to the sound generated by jetting hot water from the washing nozzle 8, while the drying operation and the deodorizing operation are performed. In view of the fact that the operation sound of the dishwasher is small, the combined pump 6 is driven at a higher speed in the first drainage operation than in the second drainage operation.
Specifically, the first target rotation speed in the first drainage operation is 2900 rotations / minute, the second target rotation speed is 3400 rotations / minute, and the first target rotation speed in the second drainage operation is 2400. At a rotation / minute, the second target rotation speed is 2900 rotations / minute.

Hereinafter, the control operation of the first drain operation will be described based on the flowchart of FIG.
First, the dual-purpose pump 6 is started to rotate in reverse at the first target rotational speed corresponding to the set low drainage capacity (# 21). Incidentally, in the flowchart of FIG. 16, in order to describe the control operation in an easy-to-understand manner, the process of # 21 is described to be performed only once at first, but actually, the dual-purpose pump 6 is set to the first target rotational speed. The FB control for driving at the same time is repeated while the dual-purpose pump 6 is driven at the first target rotational speed.
Thereafter, it is detected whether or not the detected water level of the water level detection sensor J changes from the cleaning water level Y2 until a set standby time (for example, 10 seconds) elapses (# 22, # 23).

  In # 22 and # 23, when it is detected that the detection water level of the water level detection sensor J has changed from the cleaning water level Y2 before the set standby time (for example, 10 seconds) elapses, the combined pump 6 In a state where the reverse rotation drive is continued at the first target rotational speed corresponding to the set low drainage capacity, the system waits until a set time for washing drainage (for example, 20 seconds) elapses (# 26). ) When the set time for cleaning drainage (for example, 20 seconds) elapses, the dual-purpose pump 6 is stopped (# 27).

  In # 22 and # 23, when it is not detected that the detected water level of the water level detection sensor J has changed from the cleaning water level Y2 before the set standby time (for example, 10 seconds) elapses, the combined pump 6 is turned on. The reverse rotation is started at the second target rotation speed corresponding to the set high drainage capacity (# 24). Incidentally, in the flowchart of FIG. 16, in order to describe the control operation in an easy-to-understand manner, the process of # 24 is described to be performed only once. However, in actuality, the dual-purpose pump 6 is driven at the second target rotational speed. The FB control for this is repeated while the dual-purpose pump 6 is driven at the second target rotational speed.

  Next, when it is detected that the detection water level of the water level detection sensor J has changed from the cleaning water level Y2 (# 25), it waits until a set time for cleaning drainage (for example, 20 seconds) elapses from that point. (# 26) After that, when a set time for washing and draining (for example, 20 seconds) elapses, the dual-purpose pump 6 is stopped (# 27).

Next, the second drainage operation will be described with the drainage operation in the drying operation as a representative.
That is, the control operation of the second drainage operation will be described based on the flowchart of FIG. 17 while explaining the drying operation.

First, the operation of the heater 9 and the circulation fan 23 is started, and the supply of dehumidified hot water is started (# 31).
Next, it is determined whether or not the combined use pump 6 is in a drainage operation (# 32), and if it is not in a drainage operation, is the detected water level of the water level detection sensor J the hot water increased water level Y1b? It is determined whether or not (# 33). That is, it is determined whether or not the hot water and condensed water after the dehumidifying process are stored up to a water level corresponding to the hot water increased water level Y1b.

If it is determined in # 33 that the water level is not the hot water increase level Y1b, it is determined whether the elapsed time from the start of the drying operation has passed the set time for drying (for example, 25 minutes) (# 41) When the set time for drying has elapsed, the operation of the heater 9, the circulation fan 23, and the combined pump 6 is stopped, and the supply of dehumidifying hot water is stopped (# 42), and the next operation is performed. Will be transferred to.
If it is determined at # 41 that the set time for drying has not elapsed, the process proceeds to # 32.

  When it is determined at # 33 that the hot water level is increased Y1b, the dual-purpose pump 6 is started to reversely rotate at the first target rotational speed corresponding to the set low drainage capacity (# 34). Start drainage operation. Incidentally, in the flowchart of FIG. 17, in order to describe the control operation in an easy-to-understand manner, the process of # 34 is described to be performed only once, but actually, the dual-purpose pump 6 is driven at the first target rotational speed. The FB control for this is repeated while the dual-purpose pump 6 is driven at the first target rotational speed.

  Next, it is detected whether or not the detected water level of the water level detection sensor J changes from the hot water increased water level Y1b before the set standby time (for example, 10 seconds) elapses (# 35, # 36). Incidentally, the fact that the detection water level of the water level detection sensor J changes from the hot water increase water level Y1b corresponds to the detection of the hot water discharge water level Y1a by the water level detection sensor J.

  If it is detected in # 35 and # 36 that the detected water level of the water level detection sensor J has changed from the hot water increased water level Y1b before the set standby time (for example, 10 seconds) elapses, the combined pump 6 Whether or not the elapsed time from that time has passed the set time for dry drainage (for example, 20 seconds) in the state where the reverse rotation drive is continued at the first target rotational speed corresponding to the set low drainage capacity (# 39), and if the set time for dry drainage (for example, 20 seconds) has elapsed, the combined pump 6 is stopped (# 40), and then the process proceeds to # 41.

  In # 35, it is determined that the detected water level of the water level detection sensor J does not change from the hot water discharge water level Y1, and in # 36, it is determined that the set standby time (for example, 10 seconds) has not elapsed. If so, the process proceeds to # 32.

  If it is not detected in # 35 and # 36 that the detected water level of the water level detection sensor J has changed from the hot water increased water level Y1b even after the set standby time (for example, 10 seconds) has elapsed, the combined pump 6 is turned on. The reverse rotation is started at the second target rotation speed corresponding to the set high drainage capacity (# 37). Incidentally, in the flowchart of FIG. 17, in order to describe the control operation in an easy-to-understand manner, the process of # 37 is described to be performed only once, but actually, the dual-purpose pump 6 is driven at the second target rotational speed. The FB control for this is repeated while the dual-purpose pump 6 is driven at the second target rotational speed.

  Next, it is determined whether or not the detected water level of the water level detection sensor J has changed from the hot water increase water level Y1b (# 38), and it is determined that the detection water level of the water level detection sensor J has changed from the hot water increase water level Y1b. Is shifted to the process of # 39, that is, the process of determining whether or not the elapsed time from that time has passed the set time for dry drainage (for example, 20 seconds), in # 38, If it is not determined that the detected water level of the water level detection sensor J has changed from the hot water discharge water level Y1b, the process proceeds to # 32.

If it is determined in # 32 that the drainage operation is being performed, it is determined whether or not the drainage capacity has been set (# 43).
That is, when starting to reversely drive the dual-purpose pump 6 at the first target rotational speed at # 34, the drainage operation is in progress, and then at # 35 and # 36, the set standby time (for example, 10 seconds) It is detected that the detected water level of the water level detection sensor J has changed from the hot water increased water level Y1b before the elapse of time, and the combined pump 6 is driven in reverse at the first target rotational speed corresponding to the set low drainage capacity. When it is continued or at # 35 and # 36, it is not detected that the detected water level of the water level detection sensor J has changed from the hot water increased water level Y1b until the set standby time (for example, 10 seconds) elapses. At 37, when it is started to reversely drive the dual-purpose pump 6 at the second target rotational speed corresponding to the set high drainage capacity, the drainage capacity is already set.

  If it is determined in # 43 that the drainage capacity has not been set, the process proceeds to # 35. If it is determined that the drainage capacity has been set, the target rotational speed of the dual-purpose pump 6 is set to the second target rotation. It is determined whether or not the speed is set (# 44).

When it is determined at # 44 that the target rotational speed of the dual-purpose pump 6 is not the second target rotational speed, the process proceeds to # 39 and it is determined that the target rotational speed of the dual-purpose pump 6 is the second target rotational speed. Sometimes, it is determined whether or not the detected water level of the water level detection sensor J has already changed from the hot water increased water level Y1b (# 45).
If it is determined in # 45 that the hot water increased water level Y1b has already changed, the process proceeds to # 39. If it has been determined that the hot water increased water level Y1b has not been changed, the process proceeds to # 38. Will be migrated.

  In addition, since the drainage operation in the deodorizing operation is the same as the drainage operation in the drying operation described above, the description thereof is omitted in this document.

In the dishwasher of this embodiment, as shown in FIG.4 and FIG.5, the pressure adjustment means W which adjusts automatically so that the internal pressure of the washing | cleaning space Q of the closed state may turn into an external pressure is provided.
That is, for example, in the cleaning process, when the electric heater 9 is heated, the temperature in the cleaning space Q becomes a considerably high temperature (for example, 67 ° C.). Thereafter, the washing water is discharged, and the rinsing water is supplied to the washing space Q for the rinsing process, and the rinsing water is ejected from the washing nozzle 8 by the operation of the combined pump 6. The temperature is low (for example, 13 to 17 ° C.). For this reason, when low-temperature rinse water is ejected from the cleaning nozzle 8, the temperature in the cleaning space Q rapidly decreases. As a result, a large amount of air in the cleaning space Q contracts rapidly, and the cleaning space Q In some cases, the internal pressure of Q tends to decrease greatly. In such a case, the internal pressure of the cleaning space Q is automatically adjusted to the external pressure by the action of the pressure adjusting means W.

The pressure adjusting means W is configured to adjust the pressure in the cleaning space Q by communicating with the cleaning space Q in the cleaning tank D through the communication hole 32 formed in the back wall DR of the cleaning tank D. However, in the present embodiment, description of the detailed configuration is omitted.
Note that condensed water may be generated in the pressure adjusting means W, and the condensed water is collected in the cleaning tank D via the water level detection sensor J.

Hereinafter, the water level detection sensor J will be described.
As shown in FIGS. 7 to 13, a hot water storage tank 40 for detecting a water level, which is connected to the bottom of the cleaning tank D by a guide tube 13 and into which hot water in the cleaning tank D is introduced, and a hot water storage tank 40. A float 41 for detecting the water level that moves up and down according to the level of the hot water stored in the hot water storage tank 40 and a shaft portion 41B that extends upward from the main body 41A of the float 41 are guided so as to be raised and lowered. And a pair of a first water level detection unit T1 and a second detection unit T2 that are positioned above the upper end of the hot water storage tank 40 and that detect two up and down positions of the float 41 are provided. It has been.

  The hot water storage tank 40 is formed in a bottomed cylindrical shape having a quadrangular cross-sectional shape, and a connecting cylinder portion 40C is provided at the bottom as a communication port to which the above-described guide tube 13 is connected. The upper opening is covered with a lid body 42 that is formed and is fitted on the upper portion thereof.

Incidentally, the upper end portion of the hot water storage tank 40 is provided with a washing water receiving portion 40A and a dew condensation water receiving portion 40B for receiving dew condensation water from the pressure adjusting means W in a protruding state outward, and a lid 42 is provided. In addition, the opening for connecting with the pressure adjusting means W is formed in the cover 42 so as to cover the storage portion 40A and the condensed water receiving portion 40B for receiving the washing water, and covering the condensed water receiving portion 40B in the lid body 42. Vk is formed.
The function of the washing water receiving unit 40A will be described later.

  The two up and down positions of the float 40 are a lift position (see FIG. 11) for detecting the cleaning water level Y2 and a lift position (see FIG. 10) for detecting the hot water discharge water level Y1a. The water level detection unit T1 detects that the float 41 is located at the elevation position for detecting the higher cleaning water level Y2, and the second water level detection unit T2 is located at the elevation position for detecting the lower hot water discharge water level Y1a. It is configured to detect that the float 41 is located.

  The first water level detection unit T1 and the second detection unit T2 are configured using a photo-interrupter type optical sensor, and the first water level detection unit T1 is provided on the first sensor mounting unit 42a protruding from the upper part of the lid body 42. The second water level detection unit T2 is mounted on the second sensor mounting portion 42b that protrudes from the top of the lid body 42.

Further, the above-described abnormal water level detecting electrode 43 for detecting the abnormal water level is located on the lid body 42 such that the upper end side is positioned above the lid body 42 and the lower end side protrudes into the hot water storage tank 40. Is provided.
That is, as shown in FIG. 12, the abnormal water level detection electrode 43 has a second water level detection unit T1 on the high water level side of the first water level detection unit T1 and the second detection unit T2. When the set amount is higher than the detected water level, the lid 42 is equipped with the hot water stored in the hot water storage tank 40.

As shown in FIGS. 7 and 10, the shaft portion 14B of the float 41 detects the hot water discharge water level Y1a in a state in which the float 14 is located at the lower water level elevating position among the plurality of elevating positions. The upper end portion of the hot water storage tank 40 is positioned below the upper end of the hot water storage tank 40 in the state where the upper and lower positions are located.
In addition, the guide unit U is configured to guide the shaft 40B of the float 40 positioned below the upper end of the hot water storage tank 40 so as to be positioned below the upper end of the hot water storage tank 40. Yes.

And the rocking lever 44 provided with the to-be-detected part 44a detected by the 2nd detection part T2 of the low water level side among the 1st water level detection part T1 and the 2nd detection part T2 is the shaft part 41B of the float 41. It is provided in a state where it is linked to the upper end of the upper and lower parts and swings up and down.
In other words, the swing lever 44 is pivotally supported by the second sensor mounting portion 42b so as to swing up and down around the horizontal axis X, and one end side portion of the horizontal axis X is the above-described detected portion. The other end side portion of the horizontal axis X is formed in the linkage portion 44b with the shaft portion 41B.
The linkage portion 44b is formed in a bifurcated shape, and is configured such that the upper end of the shaft portion 41B is engaged with the linkage portion 44b.

That is, as shown in FIG. 13, a pair of left and right flag bodies 41a project from the upper end portion of the shaft portion 41B and below the upper end, and the upper end of the shaft portion 41B is prevented from coming off. The projecting portion 41b is formed so as to protrude in the same direction as the pair of left and right flag bodies 41a.
Then, the bifurcated linkage portion 44b of the swing lever 44 is inserted between the protrusion 41b for preventing the detachment and the pair of left and right flag bodies 41a, and the upper end of the shaft portion 41 is a bifurcated linkage portion. 44b is configured to penetrate through 44b.

As shown in FIG. 11, in the state where the shaft portion 41B of the float 41 is located at the elevated position on the high water level side among the plurality of elevated positions, that is, in the state where the cleaning water level Y2 is detected, The upper end portion is formed to have a length that is located above the upper end of the hot water storage tank 40.
Then, one of the pair of flag bodies 41a described above is configured to function as a detected portion detected by the first detection portion T1.

The guide portion U is configured as a guide groove U1 that engages one of a pair of flag-like bodies 41a provided at the upper end portion of the shaft portion 41B over the entire lifting / lowering range of the float 41. That is, one of the pair of flag bodies 41a is configured to function as a guided piece engaged with the guide groove U1.
Incidentally, the guide unit U is also configured to include an auxiliary guide groove U2 that engages the flag-like body 41a that functions with the detected part detected by the first detection unit T1 of the pair of flag-like bodies 41a. However, although this auxiliary guide groove U2 exists up to the vicinity of the first detection unit T1, it does not exist at a place where the flag-like body 41a that functions as the detected unit is detected by the first detection unit T1. Therefore, the float 41 is not guided over the entire lifting / lowering range of the float 41.

  When the guide portion U is described further, the cover 42 that covers the upper opening of the hot water storage tank 40 is a downward concave that protrudes downward from the upper end of the water storage tank in a state where the lid 41 is positioned lower as the shaft 41B is inserted. 42A and an upper protruding portion 42B for forming a guide groove are formed, and the guide groove U1 is formed in a state extending over the recessed portion 42A and the upper protruding portion 42B of the lid body. Yes.

  Further, the lid body 42 is formed in a state having an upper protruding portion 42C for forming the auxiliary guide groove for forming the auxiliary guide groove U2, and the auxiliary guide groove U2 is formed in the recessed portion 42A and the lid in the lid body 42. It is formed in a state extending over the upper projecting portion 42 </ b> C of the body 42.

The water level detection sensor J of the present embodiment is received on the upper surface of the lid 42 when the swing lever 44 swings to a lower position corresponding to the hot water discharge water level Y1a. The lowest water level in the detection range corresponds to the hot water discharge water level Y1a.
The detected portion 44a provided in the swing lever 44 is detected by the second detection portion T2 on the low water level side when the hot water level in the cleaning space Q is the hot water discharge water level Y1a, and the cleaning space Q When the water level of the hot water rises above the hot water discharge water level Y1a, it is configured to change to a state where it is not detected by the second detection unit T2 on the low water level side. Therefore, in the water level detection sensor J of the present embodiment, the water level at which the detected portion 44a changes from the state detected by the second detection unit T2 on the low water level side to the state where it is not detected corresponds to the hot water increased water level Y1b. become.

When the above-described washing water receiving unit 40A is described, as shown in FIG. 5, when performing drainage operation, a part of hot water flowing through the drain pipe 12 passes through the branch pipe 12a to the water level detection sensor J side. The branch pipe 12 is connected to a pipe connecting part 40a provided in the washing water receiving part 40A.
Accordingly, when a drainage operation is performed, a part of hot water drained by the dual-purpose pump 6 flows into the washing water receiving portion 40A and then discharged into the hot water storage tank 40, whereby the hot water storage tank 40 The wall surface can be cleaned.

[Another embodiment]
Next, another embodiment will be described.
(A) In the above embodiment, the hot and cold intermittent means includes a first on-off valve that opens and closes the water supply channel, a second on-off valve that opens and closes the branch for the cleaning tank, and a constant flow valve equipped in the dehumidification branch However, in addition to these valves, an opening / closing valve for opening / closing the dehumidifying branch may be provided.
And when providing the on-off valve which opens and closes the dehumidification branch path, you may implement by the form which abbreviate | omits the 1st on-off valve which opens and closes a water supply path.

(B) In the above embodiment, the drawer type dishwasher in which the cleaning tank is provided so as to be freely drawn out and stored in the horizontal direction with respect to the main body case part is illustrated, but the cleaning tank is stored in the main body case part. The present invention can also be applied to a dishwasher in which the washing space of the washing tub is opened and closed by opening and closing the front door of the main body case.

(C) In the above embodiment, every time the drainage operation is performed, when the drainage pump is once driven with the set low drainage capacity, and then the detected water level of the water level detecting means does not change even after the set standby time has elapsed. The case where the drainage pump is driven with a set high drainage capacity higher than the set low drainage capacity, that is, the case where the operation of measuring the drainage head by driving at the set low drainage capacity is executed is illustrated. When the drainage operation is performed for the first time after installation, the operation to measure the drainage head is executed, and it is determined whether to operate at the set low drainage capacity or the set high drainage capacity. May be configured to operate the drainage pump at the determined drainage capacity.
In other words, once the dishwasher is installed, the drainage head does not change, so whether to operate at the set low drainage capacity or the set high drainage capacity at the first drainage operation. After that, the drainage pump may be operated with the determined drainage capacity.

(D) In the above embodiment, the case where the set low drainage capacity is switched to the set high drainage capacity only once is exemplified, but for example, the water level detection is performed even if the set standby time elapses after switching to the set high drainage capacity. When the detected water level of the means does not change, it may be carried out in a form of repeatedly switching to a larger set high drainage capacity.
In other words, the set high drainage capacity may be set in a plurality of stages, and when the detected water level of the water level detecting means does not change, it may be repeatedly changed to the high drainage capacity side sequentially.

(E) In the above embodiment, the drain pump is driven by a DC motor, but the drain pump may be driven by an AC motor. In this case, for example, the cleaning pump is set to a set target rotational speed. In order to drive the motor, the drive power supplied to the AC motor may be adjusted by phase control, or the frequency and voltage may be adjusted by inverter control.

(F) In the above embodiment, a dual-purpose pump that functions as a washing pump in forward rotation and functions as a drainage pump in reverse rotation is exemplified. However, even if the washing pump and the drainage pump are separately provided, good.

(G) In the above embodiment, the case where the drainage capacity is adjusted by adjusting the rotational speed is exemplified. For example, a variable capacity pump is used as the drainage pump, and the drainage capacity is adjusted by adjusting the capacity. Various adjustment modes of the drainage capacity can be changed.

(H) In practicing the present invention, various forms of water level detection means can be applied instead of the water level detection sensor described in the above embodiment.

6 Drain pump 9 Heating means 21 Air supply port 22 Air suction port 23 Ventilation means 25 Blowing means D Washing tank E Hot water intermittent means F Ventilation path f1 Ascending path part f2 Decreasing path part G Dehumidifying part H Control means J Water level detection means Q Cleaning Space Y1b Increased hot water level Y2 Cleaning water level

Claims (6)

Control means for executing a cleaning process for cleaning a cleaning object in a cleaning space of a cleaning tank, a rinsing process for the cleaning object, and a drying process for drying the cleaning object,
When the control means discharges the hot water stored in the cleaning space, the tableware is configured to execute a drainage operation that operates a drainage pump that draws hot water from the bottom of the cleaning space and discharges it to the outside. A washing machine,
In the drain operation, the control means operates the drain pump at a set low drainage capacity, and then the detected water level of the water level detecting means for detecting the level of hot water stored in the washing tank has passed a set standby time. A dishwasher configured to operate the drainage pump with a set high drainage capacity higher than the set low drainage capacity when it does not change. Hot water intermittent means for intermittently supplying hot water to the cleaning space is provided,
The water level detection means is configured to detect that hot water of a cleaning water level is stored in the cleaning space;
In the cleaning process and the rinsing process, the control means is configured to control the hot water intermittent means to store the hot water at the cleaning water level in the cleaning space for cleaning and rinsing, and The dishwasher of Claim 1 comprised so that the operation | movement which discharges the hot water of the said water level for washing | cleaning stored in the said washing | cleaning space as the said drainage operation may be performed.   In the drainage operation, the control means is configured to operate the drainage pump when a detection water level of the water level detection means changes from the cleaning water level until a set time for cleaning drainage elapses from that point. The dishwasher according to claim 2. By cooling the air in the cleaning space circulated by the ventilation means through the ventilation path extending from the air suction port to the cleaning space and the air supply port to the cleaning space by contact with hot water for dehumidification, A dehumidifying part configured to condense and dehumidify moisture in the air, and flow the dehumidified hot water and condensed water into the cleaning space; and a heating means for heating the air in the cleaning space. Provided,
Hot water intermittent means for intermittently supplying hot water for dehumidification to the dehumidifying part is provided,
The water level detection means is configured to detect that hot water of a hot water increase water level is stored at the bottom of the cleaning space,
In the drying process, the control means heats the air in the cleaning space by the heating means, and brings the hot water for dehumidification and the air passing through the ventilation path into contact with each other. And the hot water intermittent means, and when the hot water to be stored at the bottom of the cleaning space in the drying operation becomes the hot water increase level as the drain operation, The dishwasher according to any one of claims 1 to 3, wherein the dishwasher is configured to discharge hot water at an increased water level.   In the drainage operation, the control means is configured to operate the drainage pump until a set time for dry drainage elapses from that point when the detected water level of the water level detection means changes from the hot water increased water level. The dishwasher according to claim 4. The air supply port and the air supply port are formed at lower positions in the side wall portion of the cleaning space,
The ventilation path is configured in an inverted U shape including an upward path portion extending upward from the air suction port and a downward path portion extending downward from the upper end portion of the upward path portion toward the air supply port. ,
The dehumidifying part is
Ejecting means for ejecting dehumidified hot water downward with respect to the air passing through the ascending path portion in the ventilation path, and air venting the ascending path portion upward by the ejecting means. It is configured to dehumidify by condensing moisture in the air by cooling with contact with dehumidified hot water sprayed downward, and the dehumidified hot water and condensed hot water are the air. The dishwasher according to claim 4 or 5, wherein the dishwasher is configured to flow into the washing space through a suction port.

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