JP2014158549A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dishwasher capable of reliably storing water inside a washing tank by an amount required for washing even in the case of low water supply pressure while preventing the damage of water leakage when an abnormality occurs.SOLUTION: A dishwasher 100 includes: a washing tank for storing dishes; water supply means (a water supply valve 2) for supplying water to the inside of the washing tank; water level detection means 16 for detecting the reach of a water level inside the washing tank to a regulation water level; water absence detection means 17 for detecting the absence of water inside the washing tank; and control means (a microcomputer 20) for determining whether the water absence detection means 17 has detected the absence of water inside the washing tank or not when the water level detection means 16 does not detect the regulation water level within a limit time after the start of water supply by the water supply means, and performing water supply time extension control to extend the time of water supply by the water supply means when the water absence detection means 17 does not detect the absence of water inside the washing tank.

Description

  The present invention relates to a dishwasher.

  A dishwasher performs cleaning by accumulating water in a cleaning tank and spraying the water from a nozzle, but a certain amount of water is required for cleaning. For this reason, conventionally, in a dishwasher, a water level detection means for detecting that a certain amount of water has accumulated in the washing tank has been provided, and after opening the water supply valve for supplying water into the washing tank and starting water supply, the water level detection When the specified water level is detected by the means, it is controlled to close the water supply valve and terminate the water supply (for example, refer to Patent Document 1).

JP 2002-536 JP

  In the dishwasher having the above-described configuration, during water supply, water supply is continued until the specified water level can be detected by the water level detection means. At this time, if an abnormality occurs in the water level detection means and the water level detection means does not react, the water supply continues beyond the specified water level, and thus there is a possibility that water will overflow from the cleaning tank. As a measure to prevent the water from overflowing from the washing tank in such an abnormality, a time limit is provided for the water supply time, and the water supply is stopped when the water level detection means does not detect the specified water level within the time limit. It is conceivable to perform control. In order to surely prevent the spread of water leakage damage, the time limit must be several minutes. However, when the feed water pressure is low, the feed water flow rate becomes small, so that water may not accumulate to the specified water level within the time limit. In such a case, there is a problem that the operation of the dishwasher stops even though no abnormality has occurred.

  The present invention has been made in order to solve the above-described problems. The amount of water required for cleaning can be reduced even when the supply water pressure is low while preventing damage from water leakage when an abnormality occurs. An object of the present invention is to provide a dishwasher that can be reliably stored inside.

  The dishwasher according to the present invention includes a washing tank for storing tableware, a water supply means for supplying water into the washing tank, a water level detection means for detecting that the water level in the washing tank has reached a specified water level, and a washing tank. No water detection means for detecting the absence of water, and no water in the washing tank when the water level detection means does not detect the specified water level within the time limit after the start of water supply by the water supply means Control means for performing water supply time extension control for extending the water supply time by the water supply means when the water absence detection means does not detect that there is no water in the washing tank. And.

  According to the present invention, it is possible to reliably store the amount of water required for cleaning in the cleaning tank even when the water supply pressure is low, while preventing damage from water leakage when an abnormality occurs.

It is a block diagram which shows the structure of the dishwasher of Embodiment 1 of this invention. It is a cross-sectional side view which shows the outline of the internal structure of the dishwasher of Embodiment 1 of this invention. It is a figure explaining the structure of the water level detection means with which the dishwasher of Embodiment 1 of this invention is equipped, and a water absence detection means. It is a flowchart explaining the whole operation | movement of the dishwasher of Embodiment 1 of this invention. It is a flowchart explaining the water supply process flow of the dishwasher of Embodiment 1 of this invention. It is a flowchart explaining the water supply process flow of the dishwasher of Embodiment 2 of this invention. It is a flowchart explaining the water supply process flow of the dishwasher of Embodiment 3 of this invention. It is a flowchart explaining the process of the special mode of the dishwasher of Embodiment 4 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of the dishwasher according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional side view showing an outline of the internal structure of the dishwasher according to Embodiment 1 of the present invention. FIG. 3 is a diagram illustrating the configuration of the water level detection means and the absence of water detection means included in the dishwasher according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the dishwasher 100 according to the first embodiment includes a washing tank 1 that houses the tableware 7. A water supply valve 2 as a water supply means for supplying the cleaning water 3 into the cleaning tank 1 is provided on the upper part of the cleaning tank 1. A cleaning pump 4 that pumps the cleaning water 3 to the cleaning nozzle 5 is provided below the cleaning tank 1. The cleaning nozzle 5 is provided with a plurality of injection holes 6 for injecting the cleaning water 3.

  A table basket 8 for storing tableware 7 is disposed above the cleaning nozzle 5 in the cleaning tank 1. Below the cleaning nozzle 5, a cleaning heater 9 for heating the cleaning water 3 and a drain pump 10 as a draining means for draining the cleaning water 3 to the outside are disposed. Further, a filter 11 is provided in the lower part of the cleaning tank 1 and downstream of the cleaning pump 4. A control device 12 is provided on the front side of the lower portion of the cleaning tank 1. A blower fan 13 is provided on the rear side of the upper portion of the cleaning tank 1. An exhaust port 14 is provided on the front side of the upper portion of the cleaning tank 1. Furthermore, the dishwasher 100 includes a temperature detection device 15 that detects the temperature of the washing water 3, a float chamber 29 that communicates with the washing tank 1, a water level detection means 16 and a no water detection means 17 that are provided in the float chamber 29. It has.

  As shown in FIG. 1, the dishwasher 100 includes a microcomputer (hereinafter referred to as “microcomputer”) 20 as control means that constitutes a part of the control device 12. On the input side of the microcomputer 20, a temperature detection device 15, a water level detection unit 16, a water absence detection unit 17, and a switch input unit 21 are connected. Further, on the output side of the microcomputer 20, a water supply valve driving circuit 24 for driving the water supply valve 2, a cleaning pump driving circuit 25 for driving the cleaning pump 4, a cleaning heater driving circuit 19 for driving the cleaning heater 9, The blower fan drive circuit 27 that drives the fan 13, the drain pump drive circuit 26 that drives the drain pump 10, the display unit drive circuit 23 that drives the display unit 22, and the notification unit 33 that performs notification by voice or the like are driven. The notification unit drive circuit 32 is connected.

  As shown in FIG. 3, the float chamber 29 includes a float 31 including a magnet 30, a guide member 36 that guides the float 31 to move in the vertical direction according to fluctuations in the water level, and an upper portion of the guide member 36. A water level detection means 16 disposed in the vicinity and a water absence detection means 17 disposed near the lower portion of the guide member 36 are provided. The water level detection means 16 and the absence of water detection means 17 are configured by, for example, a reed switch that is turned on when the magnet 30 of the float 31 approaches. FIG. 3 (3) shows a state in which the water level detection means 16 is turned on. The water level detection means 16 is turned on when the water level in the cleaning tank 1 reaches a certain water level (hereinafter referred to as “specified water level”) at which a cleaning process, a rinsing process, or a heating rinsing process described later can be performed. It is arranged in such a position. Therefore, if the water level detection means 16 is on, it can be determined that the water level in the cleaning tank 1 has reached the specified water level. If the water level detection means 16 is off, the water level in the cleaning tank 1 has reached the specified water level. It can be judged that there is no.

  FIG. 3 (2) shows a state where the waterless detection means 17 is turned on. The no-water detection means 17 is arranged at a position where it is turned on when there is no cleaning water 3 in the cleaning tank 1. Therefore, it can be determined that there is no cleaning water 3 in the cleaning tank 1 if the waterless detection means 17 is on, and it is determined that there is cleaning water 3 in the cleaning tank 1 if the waterless detection means 17 is off. it can. FIG. 3A shows a state in which the water level in the cleaning tank 1 is between a threshold value at which the water level detection means 16 is turned on and a threshold value at which the water absence detection means 17 is turned on. In the first embodiment, the water level detection means 16 and the no water detection means 17 are configured to share the float 31 and the magnet 30, but the present invention is not limited to such a configuration, and in the present invention, the water level is determined. The detection means 16 and the waterless detection means 17 may be provided completely independently.

  Next, operation | movement of the dishwasher 100 of this Embodiment 1 is demonstrated. FIG. 4 is a flowchart for explaining the overall operation of the dishwasher 100 according to the first embodiment. In FIG. 4, when the user places the tableware 7 in the tableware basket 8 in the cleaning tank 1 and then presses the start switch of the switch input unit 21, the cleaning process is started (step S <b> 1). When the cleaning process is started, the microcomputer 20 starts a water supply processing flow for storing a washable amount 3 of washable water in the cleaning tank 1 (step S2). This water supply processing flow will be described with reference to FIG.

  FIG. 5 is a flowchart for explaining a water supply process flow of the dishwasher 100 according to the first embodiment. As shown in FIG. 5, when the water supply processing flow is started, first, the microcomputer 20 indicates that the waterless detection means 17 has no cleaning water 3 in the cleaning tank 1 (hereinafter simply referred to as “no water”). Is detected, that is, whether or not the no water detection means 17 is turned on (step S100). As a result, when the water absence detecting means 17 does not detect the absence of water, it is considered that the washing water 3 remains in the washing tank 1, so the microcomputer 20 operates the drain pump driving circuit 26. Then, the drain pump 10 is driven to drain the cleaning water 3 in the cleaning tank 1 (step S101). On the other hand, when no water is detected in step S100, the microcomputer 20 starts the water supply to the cleaning tank 1 by operating the water supply valve drive circuit 24 and opening the water supply valve 2 (step S102). . When the water supply is started, the cleaning water 3 flows into the cleaning tank 1 from the water supply valve 2, whereby the cleaning water 3 accumulates in the cleaning tank 1.

  Next, the microcomputer 20 determines whether or not the elapsed time after the start of water supply is within a preset time limit (for example, about several minutes) (step S103). When the elapsed time after the start of water supply is within the time limit, it is subsequently determined whether or not it has been detected that the water level in the cleaning tank 1 has reached the specified water level, that is, whether or not the water level detection means 16 has been turned on. (Step S104). As a result, if it is not detected that the specified water level has been reached, the process returns to step S103. On the other hand, if it is detected in step S104 that the water level in the cleaning tank 1 has reached the specified water level, the microcomputer 20 stops the operation of the water supply valve drive circuit 24 and closes the water supply valve 2 to perform cleaning. Water supply to the tank 1 is terminated (step S105). When the water supply to the cleaning tank 1 is finished, the cleaning pump drive circuit 25 is operated to drive the cleaning pump 4 (step S106).

  On the other hand, if it is not detected in step S103 that the water level in the cleaning tank 1 has reached the specified water level even if the elapsed time after the start of water supply exceeds the time limit, the microcomputer 20 detects that there is no water. Whether or not water is detected, that is, whether or not the water-less detecting means 17 is turned on (step S107). As a result, when the water absence detecting means 17 detects the absence of water, it is considered that an abnormality has occurred. Therefore, the microcomputer 20 first stops the operation of the water supply valve drive circuit 24 and supplies the water supply valve. 2 is closed (step S108). Subsequently, predetermined abnormality processing is executed (step S109). As the abnormal time processing, for example, the display unit drive circuit 23 is operated to display the occurrence of abnormality on the display unit 22, and the notification unit drive circuit 32 is operated to notify the occurrence of abnormality by the notification unit 33 by voice or the like. Examples of the processing include a process of operating the drain pump driving circuit 26 to drive the drain pump 10 to drain the cleaning tank 1.

  On the other hand, in step S107, if the no water detection means 17 does not detect the absence of water, that is, if it is considered that there is the cleaning water 3 in the cleaning tank 1, the microcomputer 20 supplies the water to extend the water supply time. Perform time extension control. When performing the water supply time extension control, the microcomputer 20 determines whether the elapsed time after starting the water supply extension is within a preset extension time (for example, about 1 minute to several minutes). (Step S110). If the elapsed time after the start of extension of the water supply is within the extension time, subsequently, it is detected whether the water level in the cleaning tank 1 has reached the specified water level, that is, whether the water level detection means 16 is turned on. Is determined (step S111). As a result, when it is not detected that the specified water level has been reached, the process returns to step S110. On the other hand, if it is detected in step S111 that the water level in the cleaning tank 1 has reached the specified water level, the microcomputer 20 stops the operation of the water supply valve drive circuit 24 and closes the water supply valve 2 to perform cleaning. Water supply to the tank 1 is terminated (step S112). When the water supply to the cleaning tank 1 is finished, the cleaning pump drive circuit 25 is operated to drive the cleaning pump 4 (step S113).

  As described above, in the dishwasher 100 of the first embodiment, when it is not detected that the water level in the washing tub 1 has reached the specified water level even if the elapsed time after the start of water supply exceeds the time limit, It is determined whether or not the no water detection means 17 detects the absence of water, and when the no water detection means 17 does not detect the absence of water, the water supply time extension control for extending the water supply time may be executed. it can. For this reason, even when the feed water flow rate is reduced due to a low feed water pressure, the wash water 3 can be reliably stored in the washing tank 1 up to the specified water level, and the dishwasher 100 is stopped abnormally. Can be avoided.

  In addition, when the water absence detecting means 17 detects the absence of water in step S107, or even if the elapsed time after starting the extension of water supply exceeds the extended time in step S110, the water level in the cleaning tank 1 remains at the specified water level. If it is not detected that the water pressure has been reached, the water supply valve 2 is closed (step S108), and the abnormality process is executed (step S109). Thereby, even if an abnormality occurs, it is possible to reliably suppress the overflow of water from the cleaning tank 1, to reliably prevent the expansion of water leakage damage, and to promptly notify the user of the abnormality. .

  In the water supply process flow of FIG. 5 described above, when it is detected that the water level in the cleaning tank 1 has reached the specified water level and the driving of the cleaning pump 4 is started in step S106 or S113, the cleaning pump 4 pumps the water. The washed water 3 is sprayed from the washing nozzle 5 toward the dishes placed in the dish basket 8, and the washing process is started (step S3 in FIG. 4). Hereinafter, description will be made with reference back to FIG. When the driving of the cleaning pump 4 is started in this way, the microcomputer 20 then operates the cleaning heater drive circuit 19 to energize the cleaning heater 9 (step S4). The cleaning water 3 is heated by energizing the cleaning heater 9. When the temperature detection device 15 detects that the cleaning water 3 has reached a predetermined water temperature (for example, 55 ° C.) (step S5), the microcomputer 20 stops the operation of the cleaning heater drive circuit 19. Then, the energization to the cleaning heater 9 is stopped (step S6).

  In this way, while cleaning is performed with the heated cleaning water 3, the microcomputer 20 determines whether or not a predetermined time (for example, 20 minutes) has elapsed from the start of driving of the cleaning pump 4 (step S7). When the predetermined time has elapsed, the operation of the cleaning pump drive circuit 25 is stopped and the cleaning pump 4 is stopped (step S8). Next, the drain pump driving circuit 26 is operated to drive the drain pump 10 to start draining (step S9). When it is determined that all the cleaning water 3 in the cleaning tank 1 has been drained by the drain pump 10 (step S10), the microcomputer 20 stops the operation of the drain pump 10 (step S11). As described above, all the cleaning water 3 in the cleaning tank 1 is drained, and the cleaning process is completed (step S12).

  Next, a rinsing process is started (step S13). When the rinsing process is started, the microcomputer 20 executes again the water supply process flow of FIG. 5 described above (step S14). With this water supply processing flow, new cleaning water 3 is stored in the cleaning tank 1, and the driving of the cleaning pump 4 is started (step S15). As a result, the washing water 3 pumped by the washing pump 4 is sprayed from the washing nozzle 5 toward the dishes arranged in the dish basket 8, and rinsing is started. In this rinsing process, the cleaning heater 9 is not energized.

  Then, when a predetermined time (for example, 2 minutes) elapses from the start of driving of the cleaning pump 4 in the rinsing process (step S16), the operation of the cleaning pump drive circuit 25 is stopped to stop the cleaning pump 4 (step S17), and the waste water is discharged. The pump drive circuit 26 is operated to drive the drain pump 10 to start draining (step S18). When all the washing water 3 in the washing tank 1 is drained by the drain pump 10 (step S19), the operation of the drain pump 10 is stopped (step S20). Thereby, all the washing water 3 in the washing tank 1 is drained, and a rinse process is complete | finished (step S21). The rinsing process may be repeated a plurality of times depending on the course (step S22).

  Next, a heating rinse process is started (step S23). When the heating rinsing process is started, the microcomputer 20 executes again the water supply process flow of FIG. 5 described above (step S24). With this water supply processing flow, new cleaning water 3 is stored in the cleaning tank 1, and the driving of the cleaning pump 4 is started (step S25). As a result, the washing water 3 pumped by the washing pump 4 is sprayed from the washing nozzle 5 toward the dishes arranged in the dish basket 8, and rinsing is started. Subsequently, the microcomputer 20 operates the cleaning heater drive circuit 19 to energize the cleaning heater 9 (step S26). The washing water 3 is heated by energizing the washing heater 9, and the washing water 3 is heated to a predetermined water temperature (for example, 60 ° C.) or higher. Thereby, the tableware 7 is rinsed by heating. When the temperature detector 15 detects that the cleaning water 3 has reached a predetermined water temperature (step S27), the microcomputer 20 stops the operation of the cleaning heater drive circuit 19 and energizes the cleaning heater 9. Is stopped (step S28).

  Then, when a predetermined time (for example, 15 minutes) has elapsed from the start of driving of the cleaning pump 4 in the heating rinse step (step S29), the operation of the cleaning pump drive circuit 25 is stopped to stop the cleaning pump 4 (step S30), The drain pump driving circuit 26 is operated to drive the drain pump 10 to start draining (step S31). When the cleaning water 3 in the cleaning tank 1 is all drained by the drain pump 10 (step S32), the operation of the drain pump 10 is stopped (step S33). Thereby, all the washing water 3 in the washing tank 1 is drained, and the heating rinsing process is finished (step S34). Thus, the process for washing the tableware 7 is completed (step S35).

  As described above, according to the dishwasher 100 of the first embodiment, in the cleaning process, the rinsing process, the heating rinsing process, and the like, after the water supply from the water supply valve 2 to the cleaning tank 1 is started, within the time limit. When it is not detected that the water level in the washing tank 1 has reached the specified water level, it is determined whether or not the water absence detecting means 17 detects the absence of water, and the water absence detecting means 17 detects the absence of water. If not, the water supply time extension control for extending the water supply time can be executed. For this reason, even when the feed water flow rate is reduced due to a low feed water pressure, the wash water 3 can be reliably stored in the washing tank 1 up to the specified water level, and the dishwasher 100 is stopped abnormally. Can be avoided. In addition, when it is not detected that the water level in the cleaning tank 1 has reached the specified water level within the time limit and the no water detection means 17 detects no water, or the elapsed time after the start of water supply extension If it is not detected that the water level in the cleaning tank 1 has reached the specified water level even after the predetermined extension time has elapsed, the water supply valve 2 is closed and an abnormality process is executed. Thereby, even if it is a case where abnormality arises, it can suppress that the water overflows from the washing tank 1, can prevent the expansion of a water leak damage reliably, and can notify a user quickly of abnormality.

  Further, in the first embodiment, in the water supply processing flow, before water supply to the cleaning tank 1 is started, it is determined whether or not the water absence detecting unit 17 detects the absence of water. When none is detected, the drain pump 10 is driven to drain the cleaning water 3 in the cleaning tank 1. For this reason, since the time limit for water supply can be calculated from a certain state that the cleaning water 3 does not remain in the cleaning tank 1, the time limit can always be applied appropriately, and the cleaning tank 1 is washed. The overflow of the water 3 can be avoided more reliably.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 6. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 6 is a flowchart illustrating a water supply process flow of the dishwasher 100 according to the second embodiment. The flowchart in FIG. 6 is the same as the flowchart in FIG. 5 except that step S120 is added.

  Although the dishwasher of this Embodiment 2 can perform the water supply time extension control similar to Embodiment 1, it can also set previously so that water supply time extension control may not be performed. It is desirable that the setting of whether to execute the water supply time extension control can be changed by an operation in the special mode in order to prevent the setting from being changed by mistake. The special mode shifts to the special mode by performing an operation key input different from the normal operation or by turning on the power simultaneously with the operation key. After shifting to the special mode as described above, the setting change of whether or not to execute the water supply time extension control is performed by operating the switch input unit 21 or the like.

  As shown in FIG. 6, in the second embodiment, when the microcomputer 20 does not detect that the water level in the cleaning tank 1 has reached the specified water level even when the elapsed time after the start of water supply has passed the time limit, Then, it is determined whether or not the water absence detecting means 17 detects the absence of water (step S107). When the water absence detecting means 17 does not detect the absence of water, the water supply time extension control may be executed. It is determined whether it is set (step S120). As a result, when execution of the water supply time extension control is set, the microcomputer 20 proceeds to step S110 and executes the water supply time extension control. On the other hand, when execution of the water supply time extension control is not set, the microcomputer 20 closes the water supply valve 2 in step S108, and executes an abnormality process in step S109.

  As described above, in the second embodiment, it can be set in advance whether to execute the water supply time extension control. For this reason, when there is no need to execute the water supply time extension control, for example, in a use environment where the water supply pressure is high and the water level in the cleaning tank 1 may not reach the specified water level within the time limit. By setting so as not to execute the water supply time extension control, it is possible to more reliably prevent the cleaning water 3 from overflowing from the cleaning tank 1 when an abnormality occurs.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 7. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 7 is a flowchart for explaining a water supply process flow of the dishwasher 100 according to the third embodiment. The flowchart in FIG. 7 is the same as the flowchart in FIG. 5 except that steps S130 to S134 are added.

  The dishwasher 100 of this Embodiment 3 can change the extension time by water supply time extension control. In order to prevent the extension time from being changed by mistake, it is desirable that the extension time can be changed by an operation in the special mode. The special mode shifts to the special mode by performing an operation key input different from the normal operation or by turning on the power simultaneously with the operation key. After shifting to the special mode as described above, the extension time is changed by the water supply time extension control by operating the switch input unit 21 or the like.

  As shown in FIG. 7, in the third embodiment, the microcomputer 20 does not detect that the water level in the cleaning tank 1 has reached the specified water level even if the elapsed time after the start of water supply exceeds the time limit. Then, it is determined whether or not the no water detection means 17 detects the absence of water (step S107). If the no water detection means 17 does not detect the absence of water, the extension time is changed by the water supply time extension control. It is determined whether or not it is performed (step S130). As a result, when the extension time by the water supply time extension control has not been changed, the microcomputer 20 proceeds to step S110 and executes normal water supply time extension control.

  On the other hand, when the extension time by the water supply time extension control is changed in step S130, the water supply time extension control is executed as follows based on the changed extension time. First, the microcomputer 20 determines whether or not the elapsed time after starting the extension of water supply is within the changed extension time (step S131). If the elapsed time after the start of extension of the water supply is within the changed extension time, whether or not it has been detected that the water level in the cleaning tank 1 has reached the specified water level, that is, the water level detection means 16 It is determined whether or not it is turned on (step S132). As a result, when it is not detected that the specified water level has been reached, the process returns to step S131. On the other hand, when it is detected in step S132 that the water level in the cleaning tank 1 has reached the specified water level, the microcomputer 20 stops the operation of the water supply valve drive circuit 24 and closes the water supply valve 2 to perform cleaning. Water supply to the tank 1 is terminated (step S133). When the water supply to the cleaning tank 1 is finished, the cleaning pump drive circuit 25 is operated to drive the cleaning pump 4 (step S134). In addition, if it is not detected that the water level in the cleaning tank 1 has reached the specified water level even after the extended time after the start of extension of the water supply in step S131, the water supply valve 2 is closed ( Step S108), an abnormal time process is executed (step S109).

  As described above, in the third embodiment, the extension time by the water supply time extension control can be changed. For this reason, the extension time by the water supply time extension control can be optimally set according to the use environment such as the water supply pressure. For example, the extension time can be extended in an environment where the feed water pressure is low, and the extension time can be shortened in an environment where the feed water pressure is high. Thereby, it is possible to more reliably prevent the cleaning water 3 from overflowing from the cleaning tank 1 when an abnormality occurs, while increasing the certainty of storing the cleaning water 3 in the cleaning tank 1 to the specified water level when supplying water.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. 8. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be denoted by the same reference numerals. Omitted. FIG. 8 is a flowchart for explaining special mode processing of the dishwasher 100 according to the fourth embodiment.

  As in the second embodiment, the dishwasher 100 according to the fourth embodiment can set in advance whether or not to execute the water supply time extension control. Furthermore, the dishwasher 100 of this Embodiment 4 can change the extension time by water supply time extension control similarly to Embodiment 3. FIG. The setting of whether or not to execute the water supply time extension control and the change of the extension time by the water supply time extension control are performed by operation in the special mode. Hereinafter, the special mode process will be described with reference to FIG.

  The special mode is started when an operation key input different from the normal operation is performed or when a predetermined operation such as turning on the power simultaneously with the operation key is performed (step S200). When the special mode is started, the microcomputer 20 determines whether the setting for executing the water supply time extension control is made or the setting for not executing the water supply time extension control is made (step S201). When the setting not to execute the water supply time extension control is made, the setting not to execute the water supply time extension control is stored in the storage device 34 (step S202), and the special mode is ended (step S207).

  On the other hand, when the setting for executing the water supply time extension control is made, the setting for executing the water supply time extension control is stored in the storage device 34 (step S203). Subsequently, it is determined whether or not the extension time by the water supply time extension control has been changed (step S204). If the extension time has not been changed, the fact that there is no change in the extension time is stored in the storage device 34 (step S205), and the special mode is terminated (step S207). On the other hand, if the extension time has been changed, the changed extension time is stored in the storage device 34 (step S206), and the special mode is terminated (step S207).

  The dishwasher 100 according to the fourth embodiment executes the water supply process flow based on the information stored in the storage device 34 as described above. Since the content of the water supply process flow is the same as that of the above-described embodiment, the description thereof is omitted.

  As described above, in the fourth embodiment, information for setting whether or not to execute the water supply time extension control and information for setting the extension time by the water supply time extension control are stored in the storage device 34. Can do. Thereby, in this Embodiment 4, when there is no need to perform water supply time extension control, for example, there is no possibility that the water supply pressure is high and the water level in the cleaning tank 1 does not reach the specified water level within the time limit. In such a use environment, by setting so as not to execute the water supply time extension control, it is possible to more reliably prevent the cleaning water 3 from overflowing from the cleaning tank 1 when an abnormality occurs. Moreover, in this Embodiment 4, when it sets to perform water supply time extension control, the extension time by water supply time extension control can be optimally set according to use environments, such as water supply pressure. For example, the extension time can be extended in an environment where the feed water pressure is low, and the extension time can be shortened in an environment where the feed water pressure is high. Thereby, it is possible to more reliably prevent the cleaning water 3 from overflowing from the cleaning tank 1 when an abnormality occurs, while increasing the certainty of storing the cleaning water 3 in the cleaning tank 1 to the specified water level when supplying water.

DESCRIPTION OF SYMBOLS 1 Washing tank, 2 Water supply valve, 3 Washing water, 4 Washing pump, 5 Washing nozzle, 6 Injection hole, 7 Tableware, 9 Washing heater, 10 Drain pump, 11 Filter, 12 Control apparatus, 13 Blower, 14 Exhaust port, DESCRIPTION OF SYMBOLS 15 Temperature detection device, 16 Water level detection means, 17 No water detection means, 19 Washing heater drive circuit, 20 Microcomputer, 21 Switch input part, 22 Display part, 23 Display part drive circuit, 24 Water supply valve drive circuit, 25 Washing pump Drive circuit, 26 Drain pump drive circuit, 27 Blower fan drive circuit, 29 Float chamber, 30 Magnet, 31 Float, 32 Notification unit drive circuit, 33 Notification unit, 34 Storage device, 36 Guide member, 100 Dishwasher

Claims (9)

A washing tank for storing tableware;
Water supply means for supplying water into the washing tank;
Water level detecting means for detecting that the water level in the washing tank has reached a specified water level;
Water-less detection means for detecting the absence of water in the washing tank;
After the start of water supply by the water supply means, when the water level detection means does not detect the specified water level within a time limit, whether or not the water absence detection means has detected that there is no water in the washing tank. Determining, if the no water detection means has not detected that there is no water in the washing tank, a control means for performing a water supply time extension control for extending the time of water supply by the water supply means;
Dishwasher equipped with.   The dishwasher according to claim 1, wherein the control means stops water supply by the water supply means when the water level detection means does not detect the specified water level within the extended time by the water supply time extension control.   3. The dishwasher according to claim 1, wherein the control unit determines that the abnormality is detected when the water level detection unit does not detect the specified water level within an extended time by the water supply time extension control.   The control means is that the water level detection means does not detect the specified water level within the time limit after the water supply by the water supply means is started, and the no water detection means has no water in the washing tank. The dishwasher according to any one of claims 1 to 3, wherein when detected, the dishwasher is determined to be abnormal.   The dishwasher according to any one of claims 1 to 4, wherein whether or not to execute the water supply time extension control can be set in advance.   6. The dishwasher according to claim 5, further comprising storage means for storing information on whether to execute the water supply time extension control.   The dishwasher according to any one of claims 1 to 6, wherein an extension time by the water supply time extension control can be changed.   The dishwasher of Claim 7 provided with the memory | storage means to memorize | store the information of the extended time by the said water supply time extension control. A drainage means for draining the water in the washing tank to the outside;
The control means determines whether or not the water absence detecting means detects that there is no water in the washing tank before the water supply by the water supply means is started, and the water absence detecting means The dishwasher according to any one of claims 1 to 8, wherein drainage by the drainage means is performed when it is not detected that there is no water in the tank.

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