JPH0720161U - Dishwasher - Google Patents

Abstract

(57) [Abstract] [Purpose] Providing a dishwasher capable of suitably preventing scattering of residue and the like collected by a filter [Configuration] Time t1 (from the time when the operation of the washing pump 26 is stopped during washing or rinsing processing) Before t2 and t3), the drainage pump 35 is operated to start draining. Then,
Even if the washing pump 26 is stopped, the circulating water in the circulating pipe 28 or the like does not flow back into the dish washing tank 20 via the residual food filter 27a, and the drainage pump 35 is used at the same time as the washing water in the washing water tank 27. Drained and once leftover filter 2
It is possible to prevent the leftovers and the like collected in 7a from being dissipated in the dish washing tank 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dishwasher for washing dishes by circulating a washing liquid with a washing pump.

[0002]

[Prior art]

 Conventionally, a dishwasher as shown in FIG. 6 has been known. That is, a dish basket 3 containing the dishes 2 is stored in the dish washing tank 1, while a washing water tank 4 provided at the bottom of the dish washing tank 1 stores washing water. In the washing process, the washing pump 5 is arranged on the bottom side of the dish washing tank 1 to pass through the concavity-type filter 6 for collecting the leftover dishes disposed at the bottom of the dish washing tank 1 and the circulation pipe 7. The pressure is fed to the cleaning nozzles 8 and 9. The cleaning liquid sent under pressure is sprayed from the cleaning nozzles 8 and 9 onto the dishes 2 to wash the dishes 2. In the subsequent drainage process, the cleaning liquid or rinsing liquid after cleaning is drained to the outside through the drainage hype 10 and the drainage pump 11. In this drainage process, as shown in FIG. 7, the drainage pump 11 was operated at the time when the operation (washing or rinsing) of the washing pump 5 was finished, and the washing liquid or the rinsing liquid was drained.

Here, the drainage pump 11 is operated after the washing pump 5 is stopped, but when the washing pump 5 is stopped, the washing water in the circulation pipe 7 flows back to the bottom of the dish washing tank 1 from the washing water tank 4. There was a case where the food was washed out, and the residual foods collected by the filter 6 were scattered in the dish washing tank 1 along with this. As a countermeasure against such inconvenience, for example, Japanese Patent Laid-Open No. 61-170427, "Dishwasher" has been proposed. That is, it has a washing pump, a drainage pump, a water level detection means, and a residual food filter, and when the water is drained to a predetermined water level during drainage operation, the washing pump is intermittently or continuously operated to circulate the washing liquid, thereby remaining It is a technology that reliably collects vegetables and the like in the filter for residual foods and makes post-processing of the residual foods easy.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, it is not possible to prevent scattering of the residual foods into the cleaning tank itself due to the backflow of the cleaning water when the cleaning pump is stopped. Therefore, even if the washing pump and the drainage pump are operated in parallel, it is difficult to completely collect the residual food once scattered due to the backflow. Further, since the cleaning pump is operated when the cleaning water has dropped to the predetermined water level, the cleaning pump is operated when the cleaning water is low. Then, it is conceivable that air cannot enter the cleaning pump, making it impossible for the cleaning pump to pump the cleaning liquid. Further, since it is necessary to repeatedly operate the cleaning pump in the drainage process, there is a problem that energy consumption is increased due to unnecessary operation of the cleaning pump. The present invention has been made in view of the above circumstances, and an object thereof is to provide a dishwasher that suitably prevents scattering of leftovers and the like collected by a filter.

[0005]

[Means for Solving the Problems]

 The dishwasher of the present invention made to solve the above-mentioned problems is provided with a cleaning tank, a nozzle provided in the cleaning tank for injecting a cleaning liquid into the cleaning tank, and a nozzle provided at the bottom of the cleaning tank. A filter that filters the cleaning liquid and collects it in the collection tank, a cleaning pump that circulates the cleaning liquid collected in the collection tank to the nozzles through a circulation path when the cleaning process is performed, and a drainage process that is performed. In a dishwasher equipped with a drainage means for draining the cleaning liquid in the collection tank to the outside, the drainage means drains the drainage means before the cleaning pump is stopped during the transition from the cleaning step to the drainage step. It is characterized in that a control means for starting it is provided.

[0006]

[Action]

 According to the above configuration, when shifting from the cleaning process to the drainage process, the control means causes the drainage means to start draining of the cleaning liquid prior to the stop of the cleaning pump, so that the cleaning liquid is washed from the circulation path when the cleaning pump is stopped. Even if an attempt is made to flow back into the tank, the drain means drains the water to the outside, so that the cleaning liquid can be prevented from flowing back into the cleaning tank from the circulation path through the filter.

[0007]

[Effect of device]

 As described above, according to the dishwasher of the present invention, at the time of shifting from the washing process to the draining process, the washing liquid does not flow back into the washing tank through the filter from the circulation path. The leftovers collected in the filter do not scatter in the washing tank again, and the leftovers can be efficiently collected, and the inside of the washing tank can be kept clean. Further, since the operation of the cleaning pump is stopped when the cleaning liquid is sufficient, it is possible to prevent the occurrence of troubles due to the mixing of air into the cleaning pump. Furthermore, energy consumption can be reduced because the washing pump is not repeatedly used in vain.

[0008]

【Example】

 Next, specific embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the dishwasher 20 a includes a dishwashing tank 20 inside. Hot water is supplied from the water supply pipe 31 to the dish washing tank 20 in accordance with the opening / closing control of the water supply valve 32 provided in the middle thereof. A dish basket 23 containing dishes 22 is accommodated inside the dish washing tank 20, and a wash water tank 27 provided at the bottom of the dish washing tank 20 holds wash water prepared by mixing hot water and detergent supplied from a water supply pipe 31. It is stored. The washing pump 26 is provided on the bottom side of the dish washing tank 20 and sucks the washing water through a concave type residual food filter 27 a interposed between the dish washing tank 20 and the washing water tank 27 to circulate the washing water. The cleaning water is pressure-fed to the cleaning nozzles 24 and 25 that rotate through the ip 28 and sprayed onto the dishes 22 to perform cleaning and rinsing. The wash water after washing and rinsing is drained to the outside from the drain pipe 33 by the drain pump 35. The washing water tank 27 is also connected to a sub tank 36 by a sub tank pipe 34, and the water level of the washing water, that is, the supply amount of the washing water is detected by the float switch 37 in the sub tank 36.

The dishwasher 20a having the above configuration is controlled by the control circuit shown in FIG. 2 executing a control process described later. The control circuit 40 is a logical operation circuit in which a CPU, ROM, and RAM are connected by a common bus. The signals of the power switch 41, the start switch 42, and the float switch 37 are input to the control circuit 40. Further, the control circuit 40 outputs a control signal to the water supply valve drive circuit 44 to output the water supply valve 32, a control signal to the cleaning pump drive circuit 45 to control the cleaning pump 26, and a drain pump drive circuit 46 to the control signal. Is output to control the drainage pumps 35, respectively. A buzzer 47 and a lamp 48 are also connected to the control circuit 40, and these are also controlled.

Next, the processing executed by the control circuit 40 will be described with reference to the flowcharts of FIGS. 3 and 4 and the timing chart of FIG. FIG. 3 shows the main control process, which is started when the start switch 42 is turned on. First, in step 100, hot water supply processing is performed. That is, at time T10, the water supply valve 32 is opened and hot water is injected into the dish washing tank 20 through the water supply pipe 31. When it is detected that a predetermined amount of hot water has been injected based on the signal of the float switch 37 provided in the sub tank 36, the water supply valve 32 is closed at time T11, and the hot water supply process ends.

In the following step 102, time setting processing is performed. That is, as parameters to be passed to the subsequent continuous cleaning / drainage treatment, the cleaning time, the drainage time, and the preceding drainage time t that indicates how long before the completion of the cleaning process the cleaning process is started are set. Here, the cleaning time is set to 1 minute, the drainage time is set to 45 seconds, and the drainage preceding time is set to t1 seconds. The drainage leading time t1 second is a value that is appropriately determined, such as 1 to 2 seconds, depending on the height of the circulation pipe 28, the flow path resistance thereof, and the like.

After that, the routine proceeds to step 104, where the cleaning / drainage continuation process is performed from time T11 to time T14. The cleaning wastewater continuous treatment will be described later. In the following step 106, hot water supply processing is performed again in preparation for the rinsing step from time T14 to time T15. When a predetermined amount of warm water is injected, the process then proceeds to step 108 and the time setting process is performed. Here, the rinsing time is set to 30 seconds, the drainage time is set to 45 seconds, and the drainage advance time t for instructing how long before the rinsing step ends the drainage step is set to t2 seconds. In subsequent step 110, continuous rinse drainage processing is performed from time T15 to time T18. In the continuous rinse drainage treatment, the same treatment as the continuous cleaning drainage treatment described below is performed. Next, the routine proceeds to step 112, where hot water supply processing is performed again in preparation for rinsing processing from time T18 to time T19. Also here, when a predetermined amount of hot water is injected, the process proceeds to step 114, and the time setting process is performed again. Here, the rinse time is set to 30 seconds, the drainage time is set to 45 seconds, and the drainage leading time t is set to t3 seconds. In the following step 116, the continuous rinse drainage process is performed from time T18 to time T22, and then the main control process is ended.

Next, the continuous cleaning drainage process will be described with reference to the flowchart of FIG. The main cleaning drainage continuous process is called and executed at a predetermined time in accordance with the main control process described above. As shown in the timing chart of FIG. 5, this continuous cleaning drainage process is performed following the hot water supply process (time T10 to time T11), and the cleaning process (time T11 to time T13) and the drainage process (time T12 to time T14). ) And. First, in step 200, a single cleaning time T1 in which only the cleaning pump 26 is operated without draining water is obtained. This can be calculated by subtracting the drainage leading time t from the cleaning time. The cleaning time and the drainage leading time t, which are the parameters, are set in the time setting process of the main control process.

<Cleaning Step> In the subsequent step 202, processing for starting the cleaning step is performed. That is, the washing pump 26 is operated to pump the washing water to the washing nozzles 24, 25 through the circulation pipe 28, and the washing water is sprayed on the dishes 22. Then, the residual food adhering to the tableware 22 is collected by the residual food filter 27 a while being washed away by the cleaning water and returning to the cleaning water tank 27. At this time, since the cleaning water is sucked by the cleaning pump 26 and circulated, the residual food collected in the residual food filter 27a does not dissipate and is kept attracted to the residual food filter 27a. This state continues from time T11 to time T12.

Next, in step 204, it is determined whether or not the drainage start time T1 calculated in step 200 has elapsed since the cleaning process was started in step 202, and the cleaning process is continued until the time elapses. Continue. If it is determined that the drainage start time T1 has elapsed from the start of the cleaning process, the process proceeds to step 206 and the drainage process is started. That is, the drainage pump 35 is driven and the wash water in the wash water tank 27 is drained to the outside through the drainage pipe 33. Next, in step 208, it is determined whether or not the cleaning time has elapsed since the cleaning process was started in step 202, and the cleaning process and the drainage process are executed in parallel until the cleaning time elapses. That is, the circulation of the cleaning water by the cleaning pump 26 and the drainage of the cleaning water by the drainage pump 35 are simultaneously performed. This state is maintained for t1 hours from time T12 to time T13.

<Drainage Process> When it is determined in step 208 that the cleaning time has elapsed, the process proceeds to step 210, a process of ending the cleaning process is performed, and the operation of the cleaning pump 26 is stopped. Here, even if the washing pump 26 stops, the drainage pump 35 operates earlier than the drainage leading time t1 seconds, so that the wash water in the wash water tank 27 is discharged to the drain pipe 33 side by the drainage pump 35. Continued to be sucked. Therefore, even if the wash pump 26 stops and the wash water in the circulation pipe 28 returns to the wash water tank 27, a water flow from the wash water tank 27 to the drain pipe 33 is generated, so that the returned wash water is It is drained to the drain pipe 33 side. Therefore, there is no backflow from the circulation pipe 28 to the dish washing tank 20 through the residual food filter 27a of the wash water tank 27. The washing water in the circulation pipe 28 is discharged through the drain pipe 33 by the operation of the drain pump 35. Therefore, it is possible to prevent the leftover food collected in the leftover food filter 27a from being dissipated in the dishwashing tank 20. In the following step 212, it is judged whether or not the drainage time has elapsed since the drainage process was started in step 206, and the drainage process is continued until the drainage time elapses. If it is determined that the drainage time has elapsed, the routine proceeds to step 214, where processing for ending the drainage process is performed. That is, the operation of the drainage pump 35 is stopped. After that, the process returns to the main control process.

As described above, according to the present embodiment, when the drainage process is executed, the drainage pump 35 is operated in advance before the drainage time t before the time when the cleaning pump 26 is stopped to start the drainage. Therefore, even if the washing pump 26 is stopped, the washing water remaining in the circulation pipe 28 is drained from the drain pipe 33, and is passed from the washing water tank 27 through the dish filter 27a to the dish washing tank. Since the backwash water does not flow backward into the dish washing tank 20, it is possible to prevent the dish remaining in the dish washing tank 27a from being scattered into the dish washing tank 20. Therefore, it is possible to efficiently collect the leftover dishes and the like, and it is possible to always keep the dish washing tank 20 clean. Even if the drainage pump 35 is operated before the drainage leading time t, the operation of the wash pump 26 is stopped at the time when the wash water is sufficient. Occurrence can be prevented. Furthermore, since the washing pump 26 is operated only for the washing time or the rinsing time and does not perform the unnecessary operation thereof, and the drainage pump 35 is also operated earlier as much as the required time defined by the drainage leading time t, so both pumps are operated. It is possible to reduce the energy consumption due to.

In this embodiment, the drainage pump 35 is used for draining water. However, for example, when the drainage pipe 33 is arranged at a position where a sufficient drainage pressure is obtained, drainage is performed by opening and closing the drainage valve. It can also be configured as follows. Further, the drainage leading time t may be appropriately set according to the height of the circulation pipe 28 and the flow path resistance thereof, and when a change in the flow path resistance occurs during use, the time setting of the main control processing is performed. By changing the parameters used for processing, various situations can be dealt with and sufficient versatility can be demonstrated.

[Brief description of drawings]

FIG. 1 Device configuration diagram of dishwasher

FIG. 2 is a block diagram of a control circuit

FIG. 3 is a flowchart showing control

FIG. 4 is a flowchart showing control.

FIG. 5 is a timing chart showing control.

FIG. 6 is a device configuration diagram showing a conventional technique.

FIG. 7 is a timing chart showing control in the related art.

[Explanation of symbols]

20a ... Dishwasher, 20 ... Dishwashing tank, 26 ... Washing pump, 27 ... Washing water tank, 27a ... Restaurant filter, 3
5 ... Drain pump, 40 ... Control circuit

Claims (1)

[Scope of utility model registration request] 1. A cleaning tank, a nozzle provided in the cleaning tank for injecting a cleaning liquid into the cleaning tank, and a filter provided in the bottom of the cleaning tank for filtering the injected cleaning liquid and collecting it in a collecting tank. A cleaning pump that circulates the cleaning liquid collected in the liquid collecting tank to the nozzle through a circulation path during the cleaning process, and a drainage that drains the cleaning liquid in the liquid collecting tank to the outside during the draining process. And a control means for starting drainage by the drainage means before stopping the washing pump at the time of transition from the washing step to the drainage step. .