JP2010142321A - Dishwasher/drier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a difference in a washing degree is generated even when the operation time is the same since the water pressure of a pump motor and a flow rate are not stable when the voltage of input commercial power supply varies in a dishwasher/drier loaded with a pump using a single phase induction motor. <P>SOLUTION: For a commercial power supply voltage input to the single phase induction motor 24, a voltage detection means 12 measures an input voltage after the operation of the single phase induction motor 24 is started after washing is started, and a control means 11 compares it with a rated voltage and sets the washing operation time of a period corresponding to the high or low voltage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dishwasher that varies the washing time in consideration of the pressure of the pressurized water, the amount of water, and the degree of washing according to the power supply voltage input when washing the dishwasher.

  In a conventional dishwasher, the lower the feed water temperature used for washing, the shorter the washing time, and the longer the feed water temperature, the longer. By measuring the water supply temperature at the start of the cleaning process and changing the cleaning time according to the temperature level, the power consumption is optimized by optimizing the total time for the water supply to reach a certain temperature and the cleaning time. I was trying to suppress it.

  For example, the water temperature at the start of washing is detected by the temperature detecting means, and the cleaning continuous operation time after reaching the specified water temperature set in advance according to the level of the detected water temperature is shorter as the detected water temperature is lower, There is a dishwasher provided with control means for setting a predetermined time longer as the detected water temperature is higher (see, for example, Patent Document 1).

  FIG. 4 is a diagram showing the setting of the operation time of the dishwasher, where the water supply temperature indicates the water temperature at the start of the washing process, and the time to the specified water temperature indicates the temperature rise time to the specified temperature of the water temperature by the heater. The continuous operation time indicates the cleaning continuous time after the feed water temperature reaches the specified value. The required time until the specified temperature rise by the heater for each feed water temperature is t1, t2, t3, t4, t5, and the continuous operation time after the specified temperature is α1, α2, α3, α4, α5, and the magnitude relationship is t1 > T2> t3> t4> t5, α1 <α2 <α3 <α4 <α5.

  Further, in FIG. 5, the time from the start of cleaning with the operation time on the horizontal axis and the water supply temperature on the vertical axis until the water temperature reaches the specified temperature and the subsequent operation continuation time are shown.

  The operation will be described below.

  When water supply with a water temperature of 5 ° C. is detected by the temperature detection means at the start of washing, for example, when the temperature rise by the heater is 1 ° C./min and the specified temperature is 45 ° C., the operation time t1 to the specified temperature takes 40 minutes. . Thereafter, the cleaning time at the specified temperature is set as the duration α1.

  Moreover, when the water temperature of 40 ° C. is detected by the temperature detection means at the start of cleaning, the operation time t4 to the specified temperature is 5 minutes, and the subsequent cleaning time at the specified temperature is the continuous operation time α4.

By this method, since the required time to the specified temperature is t1> t4, the continuous operation time is changed to α1 <α4, thereby suppressing excessive operation due to the difference in water temperature, reducing power consumption, and life as a cleaning device. You can avoid wasting it.
JP-A-5-293072

  However, in the above-described dishwasher, although the operation time can be suppressed and optimized due to the difference in water temperature, the water pressure and flow rate during the washing time require stable operation of the pump motor, but in the case of a pump with a single-phase induction motor, Since the voltage of the commercial power supply that is input fluctuates due to the influence of surrounding home appliances at home, the water pressure and flow rate of the pump motor are not stable, and there is a problem that the cleaning degree varies even if the operation time is the same.

  The present invention solves the above-described conventional problems, and by providing detection means for detecting the commercial power supply voltage and frequency and the rotation speed of the pump motor, the operation time is continued according to the voltage drop and the motor rotation speed reduction. In addition, the same cleaning finish is always provided to the user by stabilizing the cleaning level, and the remaining operating time and the remaining time are displayed to notify the user of the extended operating time and the remaining time. The purpose is to provide the operating status to the user.

  In order to solve the above-described problems, the present invention has a washing tank for storing tableware, a pump for supplying pressurized water into the washing tank, a single-phase induction motor for driving the pump, and a drying means for performing drying. In a dishwasher that pressurizes and sprays hot water or supply water from a nozzle provided in the washing tank to wash and rinse dishes, and then dry with a drying means, commercial input to a single-phase induction motor The voltage detection means for detecting the power supply voltage, and after the cleaning process starts, the voltage detection means measures the input voltage after the operation of the single-phase induction motor starts, and sets it in advance according to the level compared with the rated voltage. And a control means for setting the cleaning operation time to a predetermined time longer as the detection voltage is lower and shorter as the detection voltage is higher.

  As a result, the voltage detection means measures the voltage input to the single-phase induction motor, and the control means sets the cleaning operation time according to the voltage compared with the rated voltage, so that the single-phase induction motor is set. The degree of cleaning can be stabilized by changing the cleaning time in consideration of the water pressure and flow rate of the cleaning pump driven by the motor.

  As described above, according to the present invention, when the commercial power supply voltage input to the single-phase induction motor fluctuates, the voltage detection means measures the input voltage, and the control means determines the measured voltage and Compare with the rated voltage.If it is low, set the cleaning operation time longer, and if it is higher, set the cleaning operation time shorter. The degree of cleaning can be stabilized and the user can always be provided with the same cleaning finish. Further, it is possible to improve energy saving performance without performing unnecessary cleaning operation in order to provide a stable cleaning degree.

  1st invention has the washing tank which stores tableware, the pump which supplies pressurized water in a washing tank, the single phase induction motor which drives a pump, and the drying means which performs drying, and is provided in a washing tank Voltage detection that detects the commercial power supply voltage input to a single-phase induction motor in a dishwasher that pressurizes and injects hot or supplied water from the nozzles that are used to wash and rinse dishes, and then uses drying means to dry. And after the start of cleaning, the voltage detection means measures the input voltage after the operation of the single-phase induction motor is started, and the cleaning operation time set in advance according to the level in comparison with the rated voltage, The control means is configured to set the predetermined time to be longer as the detection voltage is lower and shorter as the detection voltage is higher, so that the control means can determine the cleaning operation time from the comparison between the input voltage and the rated voltage. Adjusted.

  As a result, when the commercial power supply voltage input to the single-phase induction motor fluctuates, the voltage detection means measures the input voltage, and the control means compares the measured voltage with the rated voltage. If the cleaning operation time is long and high, the cleaning operation time is set to a short time so that the flow rate to compensate for the water pressure required for cleaning can be corrected with time, and the degree of cleaning can be stabilized. And can always provide the same cleaning finish to the user. Further, it is possible to improve energy saving performance without performing unnecessary cleaning operation in order to provide a stable cleaning degree.

  2nd invention has the washing tank which stores tableware, the pump which supplies pressurized water in a washing tank, the single phase induction motor which drives a pump, and the drying means which performs drying, and is provided in a washing tank Voltage detection that detects the commercial power supply voltage input to a single-phase induction motor in a dishwasher that pressurizes and injects hot or supplied water from the nozzles that are used to wash and rinse dishes, and then uses drying means to dry. A rotation speed detection means for detecting the rotation speed of the single-phase induction motor; after the start of cleaning, the voltage detection means measures an input voltage after the operation of the single-phase induction motor is started, and is compared with a rated voltage. When the rotational speed detection means measures the rotational speed of the single-phase induction motor when the voltage is below a certain voltage, and the detected rotational speed is lower than the rated rotational speed, a predetermined cleaning operation time is set to be longer. time of By providing the control means for setting, the control means measures the rotation speed of the single-phase induction motor with the rotation speed detection means when the input voltage is below a certain value than the rated voltage, and compares it with the rated rotation speed. Adjust the cleaning operation time.

  As a result, the control means can more accurately calculate the water pressure required for cleaning from the input voltage and rotation speed of the single-phase induction motor even when the commercial power supply voltage input to the single-phase induction motor fluctuates. The supplemented flow rate can be corrected by the cleaning operation time, and the cleaning degree can be further stabilized.

  According to a third invention, in particular, in the first or second invention, the voltage detection means includes a frequency detection means for detecting a frequency of a commercial power supply, whereby the frequency detection means determines whether the frequency detection means is 50 Hz or 60 Hz. In the case of a low frequency, the cleaning operation time is further extended in the case of a low frequency, and is set to a predetermined time by the control means.

  Thereby, even if the frequency of the commercial power source input to the single-phase induction motor is different, the water pressure and flow rate of the cleaning pump can be corrected by the cleaning operation time.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the invention, the periodic detection unit is provided with a periodic detection unit that periodically performs the voltage measured by the voltage detection unit during the cleaning operation. When the voltage fluctuates, the minimum voltage value of the measurement voltage is set as a voltage value of the voltage detection means at a predetermined time by the control means.

  As a result, if there is a voltage fluctuation due to factors that are not related to the inside or outside of the device during the cleaning operation, the minimum required cleaning degree is always provided by correcting the cleaning operation time with the minimum voltage value of the voltage drop. be able to.

  According to a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the control means includes notification means for performing a display for notifying a change in the set time when the cleaning operation time is set to a predetermined time. Thus, the notification means notifies the user of the change in the cleaning operation time.

  As a result, the user can easily know the change of the cleaning operation time, which is excellent in convenience.

  In a sixth aspect of the invention, in particular, in any one of the first to fifth aspects of the invention, the notification means includes switching display means for alternately displaying the remaining cleaning time and the extended time, so that the switching display means is a user. The remaining time of the cleaning operation time and the extended time due to the change are alternately switched and notified.

  Thereby, the user can easily know how much the remaining time of the cleaning operation time is extended, and the convenience can be further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a block diagram of the dishwasher according to Embodiment 1 of the present invention.

  In FIG. 1, a dishwasher 10 is a pump that discharges water 232 or discharges water 231 from a faucet 31 and supplies water to the washing tank 21 that stores the dishes, and the washing tank 21. And a single-phase induction motor 24 that drives the pump 23, and the power of the single-phase induction motor 24 is supplied from a commercial power input 32.

  Further, voltage detection means 12 for detecting the voltage of the power supplied from the commercial power input 32, frequency detection means 13 for detecting the frequency, periodic voltage detection means 15 for periodically measuring the voltage of the voltage detection means 12, Control for controlling the rotational speed detecting means 14 for detecting the rotational speed of the single-phase induction motor 24, the single-phase induction motor 24 from these inputs, the notification means 16 for indicating the state, and the switching display means 17 for switching the display. It comprises means 11 and drying means 22 for drying the tableware in the washing tub 21.

  FIG. 2 shows the power supply voltage fluctuation 1 of the commercial power input 32 of the dishwasher 10 in a general household, for example. The vertical axis represents the voltage of the commercial power input 32 and is the same as the voltage detected by the voltage detection means 12. The abscissa indicates the passage of time, and shows the washing operation time 3 from when the dishwasher / dryer 10 performs dishwashing from the stopped state to when the dishwasher / dryer 10 stops after completion.

  The minimum voltage 2 during cleaning indicates a case where the periodic detection means 15 periodically measures the voltage of the voltage detection means 12 during cleaning to reach the minimum voltage during the lapse of time.

  FIG. 3 shows the flow rate-water pressure characteristics (hereinafter referred to as QH characteristics) in the cleaning of the pump 23 of the dishwasher 10. The vertical axis represents the water pressure (kPa) of the pump 23, and the horizontal axis represents the flow rate (L / min) of the pump 23.

  The QH characteristic 1A shows a characteristic when the voltage of the commercial power input 32 is a rated voltage of 100 V and 60 Hz. The QH characteristic 2A shows the characteristic when the voltage of the commercial power input 32 is low voltage 90V and 60Hz, and the QH characteristic 3A shows the characteristic when the voltage of the commercial power input 32 is high voltage 110V and 60Hz.

  The operating point 4A indicates a water pressure 34 (kPa) at a flow rate of 30 L / min when the voltage of the commercial power input 32 is a rated voltage of 100 V and 60 Hz. The operating point 5A indicates a water pressure 32 (kPa) at a flow rate of 30 L / min when the voltage of the commercial power input 32 is low voltage 90V and 60 Hz, and the QH characteristic 3A indicates that the voltage of the commercial power input 32 is 110V. The water pressure 36 (kPa) at a flow rate of 30 L / min at 60 Hz is shown.

  The QH characteristic 1A1 indicates a characteristic when the voltage of the commercial power input 32 is a rated voltage of 100 V and 50 Hz. The QH characteristic 2A1 indicates a characteristic when the voltage of the commercial power input 32 is low voltage 90V and 50Hz, and the QH characteristic 3A1 indicates a characteristic when the voltage of the commercial power input 32 is high voltage 110V and 50Hz.

  The operating point 4A1 indicates a water pressure 34 (kPa) at a flow rate of 30 L / min when the voltage of the commercial power input 32 is a rated voltage of 100 V and 50 Hz. The operating point 5A1 indicates a water pressure 32 (kPa) at a flow rate of 30 L / min when the voltage of the commercial power input 32 is a low voltage of 90 V and 50 Hz, and the QH characteristic 3A1 indicates that the voltage of the commercial power input 32 is a high voltage of 110 V. The water pressure 36 (kPa) at a flow rate of 30 L / min at 50 Hz is shown.

  Next, operation | movement and an effect | action of the dishwasher 10 of such a structure are demonstrated.

  First, the dishwasher / dryer 10 supplies power from the commercial power input 32 to the single-phase induction motor 24 as power input, and supplies water from the water tap 31 to the pump 23 for cleaning. At this time, the commercial power supply voltage is maintained at the rated voltage of 100 V because it is in a stopped state.

  Next, the single-phase induction motor 24 starts rotating according to an operation start command from the control means 11 and drives the pump 23. The water supplied by driving the pump 23 is discharged 231 into the cleaning tank 21. The flow rate gradually increases, and the single-phase induction motor 24 rotates at a constant rotational speed. Thereafter, the cleaning operation into the cleaning tank 21 by the pump 23 is performed until the end of the cleaning operation time 3, and after the completion, the single-phase induction motor 24 is stopped and the cleaning water stored in the cleaning tank 21 is drained 232. For this purpose, the single-phase induction motor 24 is rotated in the reverse direction to drain water, and the single-phase induction motor 24 is stopped when it reaches a predetermined amount or less.

  During the cleaning operation time 3 from the start of cleaning to the end of cleaning, the voltage is periodically measured by the periodic detection means 15 using the voltage detection means 12 at the commercial power input 32 and the voltage change is grasped by the control means 11. To do. When the voltage of the voltage detection means 12 is lower than the rated voltage, the power (product of the QH characteristic flow rate and water pressure) decreases from the operating point 4A at the rated voltage to the operating point 5A as shown in FIG. Moreover, the work amount in the cleaning operation time 3 is also reduced. Therefore, the control means 11 performs the cleaning operation time 3 so as to extend by the rate at which the work rate is reduced. The extension time is calculated from the power at that time using the minimum voltage value 2 from a plurality of voltage values measured by the periodic detection means 15.

  Moreover, when the measurement voltage in the voltage detection means 12 is higher than a rated voltage, the washing operation time 3 is shortened. The shortening method is the same as when the voltage is low. As shown in FIG. 2, the power (product of the QH characteristic flow rate and water pressure) increases from the operating point 4A at the rated voltage to the operating point 6A. The amount of work in 3 also increases, and the control means 11 performs the cleaning operation time 3 so as to shorten the cleaning operation time 3 by the increased work rate.

  At that time, in order to know whether or not the user has extended the cleaning operation time 3, the notification means 16 displays an extension display. Further, in order to clearly notify the user of the cleaning operation time 3 and the extended time, the display of the cleaning operation time 3 and the display of the additional extended time are switched by the switching display means 17 and displayed.

  For example, when the cleaning operation time is 60 minutes and the power at the operating point 4A is 30 (L / min) × 34 (kPa) = 1020 (17 W in actual units) at the rated voltage, At 960 (16 W in actual units), 1080 at voltage 110V (18 W in actual units), the cleaning operation time 3 is extended by about 6% when the voltage is decreased, and is shortened by about 6% when the voltage is increased. The notification means 16 indicates that the cleaning operation time 3 is 64 minutes and the extension time 4 minutes, and the switching display means 17 alternately displays that 4 minutes is the extension time in the total cleaning operation time 64 minutes. . At the time of shortening, the cleaning operation time 3 is displayed as 57 minutes and the shortening time is 3 minutes.

  Further, after the start of the cleaning operation, the voltage detection means 12 detects a voltage lower than the rated voltage, and at that time, the rotation speed of the single-phase induction motor 24 is measured by the rotation speed detection means 14, and the rotation speed is constant. When the rotational speed is lower, the control means 11 performs control so as to extend the cleaning operation time according to the rotational speed. The operations of the notification means 16 and the switching display means 17 in that case are the same as the operations at the time of the voltage drop and the voltage rise, and are omitted.

Further, the frequency of the commercial power input 32 is 50 Hz or 60 Hz in the region, and the single-phase induction motor 24 and the pump 23 have different rotation speeds and QH characteristics depending on the frequencies, and the operating point also varies greatly depending on the frequency as shown in FIG. Therefore, the frequency is detected by the frequency detection means 13, and the cleaning operation time 3 is extended by the frequency. Here, the QH characteristics 1A, 2A, and 3A of 60 Hz are used as a reference, and in the case of 50 Hz, the cleaning operation time 3 is assumed to be extended because the QH characteristics 1A1, 2A1, and 3A1 decrease.

  For the extension time correction, the extension time is calculated according to the difference between the operating point 4A and the operating point 4A1 in FIG. 3, and the calculation method is the same as the operation at the time of the voltage drop and the voltage increase, and is therefore omitted. .

  Therefore, when the power supply frequency is 50 Hz and the voltage value is 90 V during operation, the cleaning operation time is extended and corrected based on the frequency and voltage.

  Here, the water tap 31 is used as an external water supply. However, a water supply tank is provided in the dishwasher 10, the supplied water is stored inside, and the water discharged to the cleaning tank 21 is circulated and cleaned. is there.

  Here, the commercial power supply voltage is described as the rated voltage 100V, but the operation is the same even when the rated voltage is 220V, 200V, and 110V.

  Further, the commercial power supply frequency has been described as being extended at 50 Hz with reference to 60 Hz, but the same is true even when the frequency is shortened at 60 Hz with reference to 50 Hz. Further, even if the frequency is a frequency other than 50 Hz or 60 Hz as the rated frequency, the operation can be made the same by determining the frequency determined by the frequency detecting means 13 in advance.

  Note that the notification means 16 may be a character display by screen display such as a buzzer, a lamp, an LED, a liquid crystal, or a voice notification by voice synthesis as long as it notifies the user of the extension operation. When the cleaning operation time and the extended time are alternately displayed, a 7-segment LED or a liquid crystal party screen display for confirming the time, or voice notification by voice synthesis may be used.

  As described above, the dishwasher according to the present invention uses a single-phase induction motor and has a simple circuit configuration and a low-cost configuration. Can be maintained. Furthermore, extra power and time can be reduced by performing an optimal cleaning time when the voltage rises.

  This can be applied not only to a cleaning pump that uses a single-phase induction motor for home use, but also to equipment such as a pump that uses a single-phase induction motor for industrial use.

The block diagram of the dishwasher of Embodiment 1 of this invention Input voltage change diagram at the time of washing operation of the dishwasher according to Embodiment 1 of the present invention Flow rate-water pressure characteristic diagram of the dishwasher according to Embodiment 1 of the present invention A diagram showing the operating time settings of a conventional dishwasher Conventional dishwasher water temperature-operation time diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply voltage fluctuation waveform 2 Minimum voltage value 3 Washing operation time 10 Dishwasher 11 Control means 12 Voltage detection means 13 Frequency detection means 14 Speed detection means 15 Periodic detection means 21 Washing tank 22 Drying means 23 Pump 231 Discharge 232 Drainage 24 Single-phase induction motor 31 Water tap 32 Commercial power supply input 1A Q-H characteristics at rated voltage 100V, 60Hz 1A1 Q-H characteristics at rated voltage 100V, 50Hz 2A Q-H characteristics at voltage 90V, 60Hz 2A1 Voltage 90V, QH characteristics at 50Hz 3A QH characteristics at 110V and 60Hz 3A1 QH characteristics at 110V and 50Hz 4A Water pressure (operating point) at a rated voltage of 100V and 60Hz at a flow rate of 30L / min
4A1 Water pressure (operating point) at a rated voltage of 100V and 50Hz at a flow rate of 30L / min
5A Water pressure (operating point) at a voltage of 90V and 60Hz at a flow rate of 30L / min
5A1 Water pressure (operating point) at a voltage of 90V and 50Hz at a flow rate of 30L / min
6A Water pressure (operating point) at a voltage of 110V and 60Hz at a flow rate of 30L / min
6A1 Water pressure (operating point) at a voltage of 110V and 50Hz at a flow rate of 30L / min
t1, t2, t3, t4, t5 Required time (minutes) to the specified water temperature for each feed water temperature
α1, α2, α3, α4, α5 Continuous operation time for each feed water temperature (minutes)

Claims (6)

A washing tank for storing tableware, a pump for supplying pressurized water into the washing tank, a single-phase induction motor for driving the pump, and a drying means for performing drying, from a nozzle provided in the washing tank, In the dishwasher that pressurizes and jets the supplied water to wash and rinse the dishes, and the drying means dries, the voltage detection means that detects the commercial power supply voltage input to the single-phase induction motor, and after the start of washing The voltage detection means measures the input voltage after the operation of the single-phase induction motor starts, and the cleaning operation time set in advance according to the comparison with the rated voltage is increased as the detection voltage is lower. And a control means for setting the predetermined time to be shorter as the detection voltage is higher. A washing tank for storing tableware, a pump for supplying pressurized water into the washing tank, a single-phase induction motor for driving the pump, and a drying means for performing drying, from a nozzle provided in the washing tank, In the dishwasher that pressurizes and jets the supplied water to wash and rinse the dishes, and the drying means dries, the voltage detection means that detects the commercial power supply voltage input to the single-phase induction motor, and the single-phase induction Rotation speed detection means for detecting the rotation speed of the motor, and after the start of cleaning, the voltage detection means measures the input voltage after the operation of the single-phase induction motor starts, and when the voltage is below a certain voltage compared to the rated voltage The rotation speed detecting means measures the rotation speed of the single-phase induction motor, and when the detected rotation speed is lower than the rated rotation speed, the control is performed to set the cleaning operation time set in advance to a predetermined time. Dishwasher, characterized in that it comprises a stage. The voltage detection means includes a frequency detection means for detecting the frequency of a commercial power supply, and determines whether the frequency detection means is 50 Hz or 60 Hz, and in the case of a low frequency, further increases the cleaning operation time. The dishwasher according to claim 1 or 2, wherein the dishwasher is set to a predetermined time. Periodic detection means for periodically performing the voltage measured by the voltage detection means during the cleaning operation, and when the measurement voltage of the periodic detection means varies, the minimum voltage value of the measurement voltage is set as the voltage value of the voltage detection means; 4. The dishwasher according to any one of claims 1 to 3, wherein the predetermined time is set by the control means. The dishwashing according to any one of claims 1 to 4, further comprising notification means for displaying a notification of a change in the set time when the control means sets the washing operation time to a predetermined time. Dryer. 6. The dishwasher according to claim 5, wherein the notifying means includes a switching display means for alternately displaying the remaining washing time and the extended time.

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