WO2014050033A1

WO2014050033A1 - Washing machine

Info

Publication number: WO2014050033A1
Application number: PCT/JP2013/005524
Authority: WO
Inventors: 上崎　昌芳
Original assignee: パナソニック株式会社
Priority date: 2012-09-28
Filing date: 2013-09-19
Publication date: 2014-04-03
Also published as: JP6229168B2; CN104703528A; KR101669378B1; CN104703528B; KR20150048204A; TWI576080B; EP2901909A1; JPWO2014050033A1; EP2901909A4; TW201420058A

Abstract

This washing machine (1) is provided with: a washing tank (2) which houses an object to be washed; a washing device which washes the object to be washed (7) by way of wash water; a heater (8) which heats the wash water; a temperature detection unit (10) which detects the temperature of the wash water; and a control unit (9) which controls a series of washing operations which are a washing step, a rinsing step, a heated rinsing step, and a drying step. The control unit has a configuration which, in the washing step and/or the heated rinsing step, upon detection of a first predetermined temperature by the temperature detection unit, performs heater control which repeatedly powers-on and powers-off the heater on the basis of pre-set setting times until elapse of a predetermined amount of time. As a result, it is possible to achieve a washing machine which maintains high washing performance and is superior in energy-saving performance.

Description

washing machine

The present invention relates to a washing machine that performs washing by spraying washing water toward a washing object such as tableware while heating the washing water.

Conventionally, as this type of washing machine, a washing machine has been proposed in which washing water is heated and sprayed from a washing nozzle toward an object to be washed such as tableware (for example, see Patent Document 1).

Hereinafter, the configuration of the washing machine described in Patent Document 1 will be described with reference to FIGS. 7 and 8.

FIG. 7 is a side sectional view of a conventional washing machine. FIG. 8 is a block diagram showing a control configuration of a conventional washing machine.

As shown in FIG. 7, the conventional washing machine 1 includes at least a washing tub 2, a washing pump 5, a washing nozzle 6, a heater 8, a control unit 9, a thermistor 10, a dish basket 11, and a drainage pump. 13 or the like. The cleaning tank 2 is provided inside the cleaning machine 1. A drain port 3 is provided at the bottom of the cleaning tank 2. The cleaning pump 5 is disposed in a pump chamber communicating with the drain port 3 and is driven by the cleaning motor 4.

Then, the cleaning water is circulated inside the cleaning tank 2 by the cleaning pump 5.

Specifically, first, cleaning water is sucked into the cleaning pump 5 from the drain port 3. The sucked cleaning water is supplied by a cleaning pump 5 to a cleaning nozzle 6 that is rotatably disposed at the inner bottom of the cleaning tank 2. The supplied cleaning water is sprayed from the cleaning nozzle 6 toward the dishes 7. Then, after the tableware 7 is washed with the jetted washing water, the washing water is circulated through a path returning to the drain port 3 again.

The heater 8 is disposed between the cleaning nozzle 6 and the bottom of the cleaning tank 2 and heats the cleaning water. The thermistor 10 is disposed in close contact with the outer bottom of the cleaning tank 2 and detects the temperature of the cleaning water. The control unit 9 detects that the washing water has reached a predetermined temperature by the thermistor 10 and performs control such as stopping energization of the heater 8.

Further, the tableware basket 11 is configured to arrange the tableware 7 in an orderly manner, and is disposed above the cleaning nozzle 6. Thereby, wash water is effectively sprayed with respect to the tableware 7 arrange | positioned at the tableware basket 11, and the tableware 7 is wash | cleaned efficiently.

Further, the cleaning tank 2 is opened forward. A lid 12 that can be opened and closed forward is attached to the front surface of the cleaning tank 2.

The drain pump 13 sucks cleaning water from the drain port 3 of the cleaning tank 2 and discharges the cleaning water to the outside through the drain hose 14.

Further, the cleaning water stored in the cleaning tank 2 is supplied from the water supply hose 15. When the control unit 9 detects that the cleaning water has been supplied up to a predetermined water level by the water level detection unit 16 communicating with the cleaning tank 2, the control unit 9 closes the water supply valve 17 and stops the supply of the cleaning water.

The blower fan 18 for drying blows air into the cleaning tank 2. Then, water vapor generated from the surface of the tableware 7 and the like is discharged out of the cleaning tank 2 through an exhaust port 19 provided in the lid 12. Thereby, the tableware 7 is dried.

Further, as shown in FIG. 8, the control unit 9 is connected to the cleaning pump 5, the heater 8, the drainage pump 13, the water supply valve 17 and the blower fan 18 via the load control unit, and controls them. Thereby, the control part 9 controls the washing | cleaning driving | operation which consists of a series of steps, such as washing, rinsing, heating rinse, and drying.

Hereinafter, the operation and action of the conventional washing machine will be described with reference to FIG. 9 and FIG.

FIG. 9 is an explanatory diagram showing a cleaning water temperature and an operation program of a conventional cleaning machine. FIG. 10 is a flowchart of a heating rinse step of a conventional washing machine.

As shown in FIG. 9, the washing operation of a general washing machine is composed of four steps: washing, rinsing, heating rinsing, and drying.

First, in the washing step, the control unit 9 operates the water supply valve 17 to supply cleaning water from the water supply hose 15. Thereafter, the cleaning pump 5 and the heater 8 are energized and operated until the cleaning water temperature reaches a predetermined cleaning temperature (for example, 57 ° C.). Then, at the end of the washing step, the control unit 9 drains the washing water by the drain pump 13.

Next, in the rinsing step, the control unit 9 operates the water supply valve 17 to accumulate new cleaning water in the cleaning tank 2. Thereafter, the heater 8 is not energized, only the cleaning pump 5 is energized, and the rinsing operation of the tableware 7 is repeatedly executed twice for a predetermined time. Then, at the end of the rinsing step, the control unit 9 drains the cleaning water by the drain pump 13.

Next, in the heating rinsing step, the control unit 9 operates the water supply valve 17 to accumulate new cleaning water in the cleaning tank 2. Thereafter, the cleaning pump 5 and the heater 8 are energized to set the temperature of the cleaning water to a predetermined temperature (for example, 80 ° C. to 85 ° C.). At this time, the heater 8 is intermittently operated so that the cleaning water has a predetermined temperature. Rinse tableware 7 in this state.

In the heating rinsing step, an operation of maintaining the washing water for a certain period of time (for example, 10 minutes) after the washing water has reached a predetermined maximum temperature (for example, 80 ° C. or higher) is usually performed due to the recent increase in hygiene awareness. To do.

Specific control operation will be described with reference to FIG.

As shown in FIG. 10, first, the controller 9 supplies water to the cleaning tank 2 to a predetermined amount of water (step S1), turns on the cleaning pump 5 (step S2), and turns on the heater 8 (step S3). ). Thus, the cleaning water is circulated and heated.

Next, it is determined whether or not the temperature of the cleaning water has reached a first maximum temperature (for example, 85 ° C.) (step S4). When the first maximum temperature is reached (Yes in step S4), energization to the heater 8 is stopped (step S5).

Next, it is determined whether or not the temperature of the washing water has decreased to a second maximum temperature (for example, 80 ° C.) lower than the first maximum temperature (step S6). When the second maximum temperature is reached (Yes in step S6), energization to the heater 8 is started (step S7).

Next, as in step S4, it is determined whether or not the temperature of the washing water has reached a first maximum temperature (for example, 85 ° C.) (step S8). When the first maximum temperature is reached (Yes in step S8), the power supply to the heater 8 is stopped (step S9).

Next, it is determined whether or not a predetermined time has elapsed (step S10). If the predetermined time has not elapsed (No in step S10), the process returns to step S6. Then, the temperature of the cleaning water is maintained between the first maximum temperature and the second maximum temperature by executing the steps after the energization of the heater 8 is repeated.

On the other hand, when the predetermined time has elapsed (Yes in step S10), the power of the cleaning pump 5 and the heater 8 is turned off (step S11). Further, the drain pump 13 is turned on (step S12), and the washing water is drained from the washing tank 2.

As described above, the temperature of the washing water in the heating rinse step is controlled.

Next, as shown in FIG. 9, in the drying step, the control unit 9 drains the cleaning water by the drain pump 13. Thereafter, an operation of intermittently energizing the heater 8 is performed for a predetermined time while energizing the blower fan 18. Thereby, the tableware 7 is dried.

Thus, the operation of the conventional washing machine 1 is executed.

However, the conventional washing machine 1 sets the temperature fluctuation width (difference between the first highest temperature and the second highest temperature) as large as about 5 ° C. when the washing water is kept at a high temperature for a certain period of time. And control. This is because the heat transfer delay of the cleaning tank 2 interposed between the thermistor 10 and the cleaning water is taken into consideration. Therefore, there is always a temperature difference between the actual temperature of the cleaning water and the temperature detected by the thermistor 10 during a transition period such as during a temperature rise due to continuous energization of the heater 8. Therefore, the controller 9 estimates and controls the temperature of the wash water by adding a temperature difference to the output value of the thermistor 10. For example, when it is desired to keep the temperature of the cleaning water at 80 ° C. or higher, control is performed to stop the energization of the heater 8 after heating the cleaning water to, for example, 85 ° C. in consideration of the magnitude of the temperature fluctuation of the cleaning water. I was going. Therefore, there is a problem that extra power consumption is required.

JP 2006-288925 A

In order to solve the above problems, a cleaning machine of the present invention includes a cleaning tank for storing an object to be cleaned, a cleaning device for cleaning an object to be cleaned with cleaning water in the cleaning tank, a heater for heating the cleaning water, A temperature detection unit that is disposed on the outer bottom surface of the cleaning tank and detects the temperature of the cleaning water, and a control unit that controls a series of cleaning operations of a washing step, a rinsing step, a heating rinsing step, and a drying step. When at least one of the washing step and the heating rinsing step, the control unit detects that the first predetermined temperature is detected, the controller turns on the heater based on a preset set time until a predetermined time elapses. It has a configuration for performing heater control that repeatedly turns off the power.

This makes it possible to suppress the temperature fluctuation of the cleaning water while maintaining a high temperature and to prevent the cleaning water from being overheated. As a result, it is possible to realize a cleaning machine that can stably maintain the cleaning water at a high temperature and has more energy saving performance.

FIG. 1 is a side sectional view of a washing machine according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control configuration of the washer according to the embodiment. FIG. 3 is an explanatory diagram showing a cleaning water temperature and an operation program of the cleaning machine of the embodiment. FIG. 4 is a flowchart of a heating rinsing step of the washing machine of the same embodiment. FIG. 5 is a flowchart showing the heater control in detail in the flowchart of FIG. FIG. 6 is a diagram showing the contents of ranking of heater control of the washing machine of the same embodiment. FIG. 7 is a side sectional view of a conventional cleaning machine. FIG. 8 is a block diagram showing a control configuration of a conventional washing machine. FIG. 9 is an explanatory diagram showing a cleaning water temperature and an operation program of a conventional cleaning machine. FIG. 10 is a flowchart of a heating rinse step of a conventional washing machine.

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)
Hereinafter, the washing machine in the embodiment of the present invention will be described. In addition, although the structure of a dishwasher is demonstrated to an example as a washing machine below, it cannot be overemphasized that it is not restricted to this. Also, the same components as those of the conventional cleaning machine described with reference to FIGS.

First, the configuration of the washer according to the present embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a side sectional view of a washing machine according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control configuration of the washer according to the embodiment.

As shown in FIG. 1 and FIG. 2, the washing machine 1 of the present embodiment includes at least a washing tank 2, a washing pump 5, a washing nozzle 6, a heater 8, a control unit 9, a thermistor 10, and tableware. The car 11 is composed of a drainage pump 13 and the like. The tableware basket 11 is provided in the cleaning tank 2. The cleaning pump 5 and the cleaning nozzle 6 are provided as a cleaning device for cleaning the tableware 7 accommodated in the tableware basket 11. The cleaning nozzle 6 is rotatably provided in the cleaning tank 2. The cleaning pump 5 pumps the cleaning water to the cleaning nozzle 6 and injects the cleaning water from the cleaning nozzle 6 toward the dishes 7 stored in the tableware basket 11.

At this time, the cleaning water in the cleaning tank 2 is heated by the heater 8. The temperature of the heated cleaning water is measured by a thermistor 10 that functions as a temperature detection unit attached to the outer bottom surface of the cleaning tank 2.

And the control part 9 detects the output voltage of the thermistor 10, and measures the temperature of wash water.

Further, as shown in FIG. 2, the control unit 9 is connected to the cleaning pump 5, the heater 8, the drainage pump 13, the water supply valve 17, and the blower fan 18 through the load control unit, and controls them. Thereby, the control part 9 controls and performs the washing | cleaning driving | operation which consists of a series of steps, such as washing, a rinse, a heating rinse, and drying.

Hereinafter, the operation and action of the cleaning machine of the present embodiment will be described with reference to FIGS.

FIG. 3 is an explanatory diagram showing a cleaning water temperature and an operation program of the cleaning machine of the embodiment. FIG. 4 is a flowchart of a heating rinsing step of the washing machine of the same embodiment. FIG. 5 is a flowchart showing the heater control in detail in the flowchart of FIG.

Basically, the operation of the washing machine for washing the dishes 7 using loads such as the washing pump 5, the washing nozzle 6 and the heater 8 is the same as that of the conventional washing machine.

Therefore, in the following, the operation and action of the washer, which is a feature of the present embodiment, which is different from the conventional washer will be described in detail.

As shown in FIG. 3, the washing operation of the washing machine of the present embodiment is composed of four steps of washing, rinsing, heating rinsing, and drying, as in the conventional washing machine.

Next, in the rinsing step, the control unit 9 operates the water supply valve 17 to accumulate new cleaning water in the cleaning tank 2. Thereafter, the heater 8 is not energized, only the cleaning pump 5 is energized, and the rinsing operation of the tableware 7 is repeatedly executed, for example, twice for a predetermined time. Then, at the end of the rinsing step, the control unit 9 drains the cleaning water by the drain pump 13. This completes the rinsing step.

Next, the operation and action of the heating rinse step, which is a feature of the present embodiment, will be described in detail with reference to FIGS.

4 and 5, when the washing step and the rinsing step are completed, the heating rinsing step is started (step S1).

Then, the control unit 9 energizes the water supply valve 17 again, and supplies cleaning water from the water supply hose 15 to the cleaning tank 2 up to a predetermined amount of water (step S2). When the control unit 9 detects that the cleaning water has been supplied to the predetermined water level by the water level detection unit 16, the control unit 9 stops the power supply to the water supply valve 17 and stops the supply of the cleaning water. Thereafter, the cleaning motor 4 is energized to drive the cleaning pump 5 (step S3) and perform a cleaning operation.

At the same time, the controller 9 energizes the heater 8 continuously (step S4) and heats the wash water to raise the temperature of the wash water. At this time, the controller 9 sets the time until the second temperature increase temperature Tb (for example, 68 ° C.) is reached from the first temperature increase temperature Ta (for example, 50 ° C.) shown in FIG. (Step S5). The temperatures of the first temperature rise temperature Ta and the second temperature rise temperature Tb are measured from the output of the thermistor 10 that detects the temperature of the washing water.

Next, a rank for determining the control content of the subsequent cleaning operation is determined from the length of the measured temperature raising time in accordance with the rank classification set in advance and stored (see FIG. 6) (step S6).

Next, the controller 9 determines whether or not the detection temperature TS of the washing water detected by the thermistor 10 is equal to or higher than the first predetermined temperature T1 (step S7). If the temperature is lower than the first predetermined temperature T1 (No in step S7), the measurement is repeated until the temperature becomes equal to or higher than the first predetermined temperature T1.

On the other hand, if the temperature of the washing water becomes equal to or higher than the first predetermined temperature T1 (Yes in step S7), a first set time for performing the heater control is set, and heater control described later is started (step S8). At this time, the first set time is the time of turning on / off the power to energize the heater 8, and is set based on the rank determined in step S6.

After that, fine heater control is performed according to the change in the temperature of the cleaning water (steps S9 to S16). Details will be described below with reference to FIG.

Next, after the heater control, it is determined whether or not a predetermined time of the heating rinsing step has elapsed (step S17). If the predetermined time has not elapsed (No in step S17), the process returns to step S9, and the subsequent heater control is repeated until the predetermined time elapses.

On the other hand, when the predetermined time has elapsed (Yes in step S17), the heater 8 is turned off (step S18).

Next, the control unit 9 stops the cleaning pump 5 (step S19).

Then, the process proceeds to the drying step shown in FIG. 3 (step S20).

Here, the ranking shown in step S6 of FIG. 4 will be specifically described with reference to FIG.

FIG. 6 is a diagram showing the contents of ranking of heater control of the washing machine of the same embodiment.

In addition, FIG. 6 is an example of a set value that is ranked according to the length of the heating water heating time in the heating rinse step. Specifically, the temperature raising time of the cleaning water is ranked into four types. Then, the first predetermined temperature (target thermistor temperature, target wash water temperature (estimated)) for starting the heater control, and the heater 8 power-on time / power-off first set time and second set time are set. Is.

Normally, the temperature rise time of cleaning water varies depending on the power supply voltage and ambient temperature. Therefore, the actual temperature of the cleaning water is estimated from the temperature detected by the thermistor 10 (detection temperature TS of the thermistor). For example, when the amount of heat generated by the heater 8 is large due to a high power supply voltage or when the ambient temperature is high, the temperature rise time of the cleaning water is short. In this case, the difference between the detected temperature TS of the thermistor and the actual temperature of the cleaning water becomes relatively large due to a delay due to heat conduction in the cleaning tank 2. Therefore, as in rank A shown in FIG. 6, the temperature of the thermistor (first predetermined temperature T1) for starting the heater control for turning on / off the heater 8 is set to 76 ° C., which is lower than the other ranks B to D. is doing.

Conversely, when the amount of heat generated by the heater 8 is small because the power supply voltage is low or when the ambient temperature is low, the temperature rise time of the cleaning water becomes long. Therefore, when the temperature rising time is long, the thermistor temperature (first predetermined temperature T1) for starting the heater control is set to 79 ° C., which is higher than the other ranks A to C, as in rank D shown in FIG. is doing.

Thus, the control unit 9 can start the heater control after the temperature of the cleaning water reaches the target cleaning water temperature, for example, 82 ° C., regardless of fluctuations in the power supply voltage and the ambient temperature. That is, by controlling the temperature of the cleaning water with time, it is possible to control the temperature fluctuation due to factors such as the power supply voltage and the ambient temperature, and to approach a certain target washing water temperature with a small fluctuation range. As a result, the temperature of the washing water can be maintained at a temperature of 80 ° C. or higher at which a high sterilization effect is obtained.

Further, as shown in FIG. 6, in this embodiment, the power on / off time of the heater 8 is set to two types of the first set time and the second set time.

The first set time is a time setting in which the control unit 9 can control the power supply voltage, the ambient temperature, and the like so as to be substantially stabilized at the target cleaning water temperature of 82 ° C. under normal conditions. That is, normally, when the temperature of the cleaning water is maintained at a high temperature, the temperature of the cleaning water is determined by the balance between the temperature increase rate (the amount of heat generated by the heater 8) and the heat dissipation rate from the cleaning tank 2. Therefore, when the temperature rising time is short, as in rank A shown in FIG. 6, the power-on time ratio with respect to power-off is set lower than other ranks B to D. On the contrary, when the temperature rising time is long, the time ratio of turning on the power with respect to turning off the power is set higher than the other ranks A to C as in rank D shown in FIG. Thereby, as shown in FIG. 3, the control part 9 can maintain the temperature of the washing water in the vicinity of the target washing water temperature, regardless of fluctuations in the power supply voltage and the ambient temperature.

However, in any case, it is difficult to maintain the temperature of the washing water completely, for example, at a constant temperature of 82 ° C. Therefore, depending on conditions such as the varying power supply voltage and ambient temperature, the temperature of the cleaning water may gradually deviate from the target cleaning water temperature.

Therefore, in the cleaning machine of the present embodiment, as shown in FIG. 5, more detailed heater control including steps S9 to S16 is executed.

Hereinafter, more detailed heater control operation and action will be described with reference to FIG.

As shown in FIG. 5, after starting the heater control (step S8), the controller 9 determines whether or not the detected temperature TS of the thermistor detected by the thermistor 10 is equal to or higher than a fourth predetermined temperature T4 (step S9). . The fourth predetermined temperature T4 is set, for example, 2 ° C. higher than the first predetermined temperature T1 set for each rank of the temperature raising time.

At this time, when the detected temperature TS of the thermistor is lower than the fourth predetermined temperature T4 (No in step S9), the controller 9 determines that the detected temperature TS of the thermistor is the first predetermined temperature set for each rank of the temperature rising time. It is determined whether or not the temperature is equal to or higher than a second predetermined temperature T2 set, for example, 1 ° C. higher than the temperature T1 (step S11).

At this time, if the detected temperature TS of the thermistor is equal to or higher than the second predetermined temperature T2 (Yes in step S11), it is determined that the temperature of the cleaning water is more likely to rise. In this case, the control unit 9 sets the power-on time ratio shown in FIG. 6 to be lower than the power-on / off time of the heater 8 at the first set time shown in FIG. The operation is changed to the power on / off time of the heater 8 for the set time (step S12). Thereby, the rise in the temperature of the washing water is suppressed, and the temperature of the washing water is stabilized in the vicinity of the first predetermined temperature T1 (target washing water temperature 82 ° C.), so that the dishes can be washed.

Next, when the detected temperature TS of the thermistor is lower than the second predetermined temperature T2 (No in step S11) and after changing to the second set time, the controller 9 increases the detected temperature TS of the thermistor. It is determined whether or not the temperature exceeds a third predetermined temperature T3 set, for example, 1 degree lower than the first predetermined temperature T1 set for each rank of time (step S13).

At this time, when the detected temperature TS of the thermistor exceeds the third predetermined temperature T3 (Yes in step S13), the controller 9 operates by changing the heater control at the first set time shown in FIG. (Step S14).

Next, while the control unit 9 is performing the heater control for the first set time (step S14), and when the detected temperature TS of the thermistor is equal to or lower than the third predetermined temperature T3 (No in step S13). Then, it is determined whether or not the detected temperature TS of the thermistor 10 is equal to or lower than a third predetermined temperature T3 set, for example, one degree lower than the first predetermined temperature T1 (step S15).

At this time, if the detected temperature TS of the thermistor is equal to or lower than the third predetermined temperature T3 (Yes in Step S15), the control unit 9 determines that the cleaning water temperature is more likely to be lowered. Then, the controller 9 heats the cleaning water once the heater 8 is turned on once (the power-off time is zero) (step S16), thereby bringing the temperature of the cleaning water closer to the first predetermined temperature T1. .

Next, it is determined whether or not the cleaning water is heated by the heater control for a predetermined time (step S17). When the predetermined time has elapsed (Yes in step S17), step S18 and subsequent steps shown in FIG. 4 are executed.

If the predetermined time has not elapsed (No in step S17), the process returns to step S9, and detailed heater control is repeatedly executed.

In the period when the heater control shown in FIG. 5 is repeated for a predetermined time, while the heater control is performed for the second set time (step S12), the thermistor 10 has a fourth temperature higher than the second predetermined temperature T2. When the predetermined temperature T4 or higher is detected (Yes in step S9), the control unit 9 determines that the cleaning water temperature is more likely to rise. In this case, the heater 8 is turned off once continuously (the power-on time is zero), and the temperature of the cleaning water is lowered (step S10). Accordingly, the temperature of the cleaning water is brought close to the target cleaning water temperature (for example, 82 ° C.) of the first predetermined temperature T1.

Thereafter, when the temperature of the cleaning water recovers to the vicinity of the first predetermined temperature T1 (step S13), step S13 is executed, and for example, the heater control is returned to the first set time (step S14).

It is possible to gently return the temperature of the cleaning water to the target cleaning water temperature (for example, 82 ° C.) by the above heater control. As a result, the temperature of the cleaning water can be maintained in the vicinity of the first predetermined temperature T1 with a small temperature fluctuation range. As a result, it is possible to realize a washing machine with better energy saving performance.

The target cleaning water temperature and the set temperature of the thermistor 10 (first predetermined temperature T1, second predetermined temperature T2, third predetermined temperature T3, and fourth predetermined temperature T4) in the heater control described in the present embodiment. ) And set time are not limited to the above set values. Needless to say, for example, the heat generation capacity of the heater 8 and the degree of heat insulation from the cleaning tank 2 to the surrounding air may be set for each type of equipment.

In the present embodiment, the four ranks and the first set time and the second set time set to two have been described as examples. However, the present invention is not limited to this. For example, it goes without saying that the number of ranks and the number of set times may be arbitrarily set according to the desired control accuracy.

In the present embodiment, the heater control in the heating rinsing step has been described in detail, but it goes without saying that the same heater control can be performed in the washing step. Thereby, the same effect can be acquired.

In the present embodiment, the dishwasher has been described as an example of the washing machine, but is not limited thereto. For example, you may use for the washing | cleaning apparatus of medical instruments, such as forceps used for an operation. Thereby, the medical instrument for which a high sterilization effect is desired can be washed with washing water at 80 ° C. or higher.

As described above, according to the present embodiment, when the temperature of the cleaning water is maintained at a high temperature for a certain period of time, it is possible to suppress an excessive warming of the cleaning water by suppressing a fluctuation range of the temperature of the cleaning water. As a result, it is possible to realize a washing machine that is more energy saving and can stably maintain washing water at a high temperature.

In addition, when the fluctuation of the temperature of the washing water is large as in the conventional washing machine, the maximum temperature of the washing water that is maintained and washed at a high temperature of 80 ° C. or higher is as high as 85 ° C. Therefore, thermal damage to the materials and parts used in the cleaning machine 1 increases. Therefore, in this embodiment, even if the power supply voltage or the ambient temperature varies, the maximum temperature of the cleaning water maintained at a high temperature is lowered from 85 ° C. to 82 ° C. by controlling the temperature of the cleaning water in detail. it can. As a result, it is possible to reduce damage to materials and parts constituting the cleaning machine 1 and realize a more reliable cleaning machine.

As described above, according to the cleaning machine of the present invention, the cleaning tank for storing the object to be cleaned, the cleaning device for cleaning the object to be cleaned with the cleaning water in the cleaning tank, the heater for heating the cleaning water, And a temperature detection unit that is disposed on the outer bottom surface of the cleaning tank and detects a temperature of the cleaning water, and a control unit that controls a series of cleaning operations of a washing step, a rinsing step, a heating rinsing step, and a drying step. When at least one of the washing step and the heating rinsing step, the control unit detects that the first predetermined temperature is detected, the controller turns on the heater based on a preset set time until a predetermined time elapses. It has a configuration for performing heater control that repeatedly turns off the power.

Further, according to the cleaning machine of the present invention, the control unit reaches the second temperature increase temperature from the time when the temperature detection unit reaches the first temperature increase predetermined during the heating of the cleaning water. The heater control may be started on the basis of the measurement result by measuring the time until the time point.

Further, according to the cleaning machine of the present invention, the control unit reaches the second temperature increase temperature from the time when the temperature detection unit reaches the first temperature increase predetermined during the heating of the cleaning water. The time up to the point of time may be measured, and the set time for turning on and off the heater control may be changed based on the measurement result.

As a result, even if the power supply voltage or the ambient temperature fluctuates, it is possible to suppress the actual temperature of the cleaning water from maintaining a desired temperature while maintaining a high temperature. As a result, the object to be cleaned can be cleaned at a more constant temperature of the cleaning water.

Further, according to the cleaning machine of the present invention, when the control unit detects that the temperature detection unit has deviated from the first predetermined temperature by a certain temperature or more while performing the heater control, the first predetermined The set time for turning on and off the heater control may be changed so as to approach the temperature.

Thus, even if the power supply voltage, the ambient temperature, etc. fluctuate, it is possible to more reliably suppress the actual temperature of the cleaning water being maintained at a high temperature from deviating from the desired temperature.

The washing machine of the present invention can suppress the fluctuation range of the heating temperature of the washing water. Therefore, it is useful in fields such as a dishwasher where it is desired to suppress dishwashing water from being overheated, and to wash dishes by maintaining energy at a high temperature and stably washing water.

DESCRIPTION OF SYMBOLS 1 Washing machine 2 Washing tank 3 Drain outlet 4 Washing motor 5 Washing pump 6 Washing nozzle 7 Tableware 8 Heater 9 Control part 10 Thermistor (temperature detection part)
DESCRIPTION OF SYMBOLS 11 Tableware basket 12 Cover 13 Drain pump 14 Drain hose 15 Water supply hose 16 Water level detection part 17 Water supply valve 18 Blower fan 19 Exhaust port

Claims

A cleaning tank for storing objects to be cleaned;
A cleaning device for cleaning the object to be cleaned with cleaning water in the cleaning tank;
A heater for heating the washing water;
A temperature detector disposed on an outer bottom surface of the cleaning tank and detecting a temperature of the cleaning water;
A controller that controls a series of washing operations of a washing step, a rinsing step, a heating rinsing step, and a drying step, and
When at least one of the washing step and the heating rinsing step, the control unit detects the first predetermined temperature, until the predetermined time elapses, the control unit is configured based on a preset set time. A washing machine that performs heater control that repeatedly turns the heater on and off.
The control unit measures a time from when the temperature detection unit reaches a predetermined first temperature rise time to when it reaches the second temperature rise temperature during heating of the washing water. The cleaning machine according to claim 1, wherein the setting of the first predetermined temperature at which the heater control is started is changed based on the measured result.
The controller measures the time from the time when the first temperature rising temperature determined in advance of the temperature detection unit is reached to the time when the second temperature rising temperature is reached during the heating of the washing water. The cleaning machine according to claim 1, wherein the set time for turning on and off the heater control is changed based on the measured result.
When the control unit detects that the temperature detection unit has deviated from the first predetermined temperature by a certain temperature or more while performing the heater control, the control unit approaches the first predetermined temperature. The washing machine according to claim 1, wherein the heater control power on / off power setting time is changed.