JP2013240405A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dishwasher that can accurately determine an amount of dishes and efficiently operate without being affected by variation in supply voltage, a temperature around the dishwasher, and further variation in a heater.SOLUTION: A control means 70 carries out a preheating step of applying an electric current to a heater 14 without injection of washing water prior to a heat washing step and heating the washing water; and varies an operating hour of a heat rinsing step on the basis of a degree of an increase in a temperature of the washing water in the preheating step detected by a temperature detection means 17 and a degree of an increase in a temperature of the washing water in the heat rinsing step carried out after a rinsing step. As a result, an amount of dishes can be accurately determined and a heating rinse or drying can be efficiently carried out in response to the amount of the dishes without being affected by variation in supply voltage, a temperature around a dishwasher 1, and further variation in the heater 14.

Description

  The present invention relates to a dishwasher that heats washing water or air with a heater to wash and dry objects to be washed such as dishes.

  In a dishwasher that cleans dishes by spraying wash water on the dishes contained in the washing tub and dries them with a heater, taking into account the effects of variations in power supply voltage in the general household and the ambient temperature of the dishwasher, There is a dishwasher in which a stable drying performance can be obtained according to the amount of the above (for example, see Patent Document 1).

  The dishwasher described in Patent Document 1 calculates the time required for drying from the temperature detected by the temperature detection means immediately after the start of operation and the degree of temperature increase detected by the temperature detection means in the heating rinse process. The operation time is determined.

JP 07-265251 A

  However, the dishwasher of Patent Document 1 considers only the influence of the power supply voltage variation in the general household and the temperature around the dishwasher, and does not support the heater power variation. There was a problem that occurred.

  An object of the present invention is to accurately determine the amount of tableware without being affected by variations in power supply voltage and temperature around the dishwasher in general households, and even variations in heaters, and rinsing with the amount of tableware. It is an object of the present invention to provide a dishwasher capable of varying the time and drying time.

  (1) A dishwasher according to the present invention detects a temperature of the washing water, a washing tank that accommodates an object to be washed, a heater that heats the washing water in the washing tank or that dries the washing object, and the washing water. Temperature detection means and control means for controlling each of the heating and washing process, the rinsing process, and the drying process of the object to be cleaned, and the control means sprays the washing water before performing the heating and washing process. A preheating step of heating the washing water by energizing the heater without being accompanied is performed after the rinsing step and the degree of increase in the temperature of the washing water during the preheating step detected by the temperature detecting means. The operation time of the heating and rinsing process is controlled to be variable from the degree of temperature rise of the washing water during the heating and rinsing process. This makes it possible to accurately determine the amount of tableware without being affected by variations in power supply voltage and the ambient temperature of the dishwasher in general households, and variations in heaters. It becomes possible to efficiently operate by shortening the operation time of the rinsing process.

(2) The control means varies the operation time of the drying step from the degree of temperature rise of the washing water during the preliminary heating step and the degree of temperature rise of the washing water during the heating rinsing step. To control. As a result, the amount of tableware is judged accurately without being affected by variations in power supply voltage and the temperature around the dishwasher in general households, and variations in heaters. It becomes possible to shorten the operation time of the process and to operate efficiently.

  According to the present invention, the amount of tableware is accurately determined without being affected by variations in power supply voltage and the ambient temperature of the dishwasher in a general household, and variations in heaters. Can efficiently operate by shortening the operation time of the heating rinsing process and the drying process.

The side view which shows the structure of the dishwasher which concerns on one embodiment of this invention Block diagram showing the configuration of the control system of the dishwasher Flow chart showing the operation outline of the dishwasher Timing indicating the change in temperature of washing water from the start of operation to the heating washing process when the heater power and the power supply voltage of the dishwasher are constant and the ambient temperature of the dishwasher is different by the control means of the dishwasher chart Timing indicating the change in temperature of the washing water from the start of operation to the heating washing process when the ambient temperature of the dishwasher is constant and the power supply voltage of the dishwasher and the power of the heater vary by the control means of the dishwasher chart The flowchart which shows the process which determines the threshold value for determining the quantity of tableware from the temperature rise value of the wash water in the preheating process by the control means of the same dishwasher Timing chart showing the operation from the end of the rinsing process to the end of the drying process when the amount of tableware is large, by the control means of the dishwasher Timing chart showing the operation from the end of the rinsing process to the end of the drying process when the amount of tableware is small, by the control means of the dishwasher The flowchart which shows the operation | movement for determining the quantity of the tableware at the time of a heating rinse process by the control means of the same dishwasher Threshold characteristic diagram for determining the amount of tableware by the control means

  Hereinafter, a dishwasher according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In the following description, a liquid used for cleaning and rinsing an object to be cleaned such as tableware is referred to as cleaning water.

(1) Structure of dishwasher FIG. 1: is a side view which shows the structure of the dishwasher which concerns on one embodiment of this invention. In the side view of FIG. 1, the inside of the dishwasher 1 is shown in a transparent manner.

  As shown in FIG. 1, the dishwasher 1 includes a housing 1a. A door 6 that can be opened and closed is provided on the front surface of the housing 1a. A window portion 6 a is formed in a part of the door 6. A cleaning tank 2 is provided in the housing 1a for storing and cleaning the object 10 such as tableware. An upper table basket 8 is provided at the upper stage of the cleaning tank 2 so as to be movable in the front-rear direction. A lower table basket 9 is provided at the lower part of the cleaning tank 2 so as to be movable in the front-rear direction. Various objects to be cleaned 10 are accommodated in the upper table basket 8 and the lower table basket 9.

A substantially cross-shaped fixed cleaning nozzle 5 is disposed on the back surface of the cleaning tank 2. On one side of the cleaning tank 2, a water conduit 7 a is attached so as to extend forward from the fixed cleaning nozzle 5. A rotary cleaning nozzle 7 is attached to the tip of the water guide pipe 7a so as to be rotatable around the vertical axis. The rotary cleaning nozzle 7 has blade portions extending in one direction and in the opposite direction from the rotation center, and a plurality of liquid injection ports (not shown) are formed on the upper surfaces of the blade portions. The rotary cleaning nozzle 7 is disposed below the upper table basket 8. A rotary cleaning nozzle 3 is attached to the bottom of the cleaning tank 2 so as to be rotatable around the vertical axis. Similar to the rotary cleaning nozzle 7, the rotary cleaning nozzle 3 has blade portions extending in one direction and the opposite direction from the center of rotation, and a plurality of liquid ejection ports (not shown) are formed on the upper surfaces of the blade portions. Has been.

  On the front side of the washing tub 2 below the lower table basket 9, there is formed a reservoir 12 for temporarily storing washing water used for washing or rinsing the article to be washed 10. The reservoir 12 is provided with a heater 14 for heating the stored cleaning water and for heating the atmosphere inside the cleaning tank 2. Further, the storage unit 12 is provided with temperature detection means 17 such as a temperature sensor for detecting the temperature of the stored cleaning water and the temperature of the atmosphere inside the cleaning tank 2. A drain port 12 a is formed at the bottom of the storage unit 12. A leftover filter 13 for collecting the leftovers removed from the object to be cleaned 10 is detachably mounted immediately above the drain port 12a. In the present embodiment, the leftovers refer to solid substances in the dirt removed from the object to be cleaned 10 by washing or rinsing.

  A washing water introduction / derivation portion G is formed at the lower portion of the drain port 12a. One end of a water supply pipe 31 is connected to the cleaning water introduction / derivation part G. The water supply pipe 31 extends to the outside of the housing 1a, and the other end is connected to a water pipe (not shown). A water supply valve 31 a is inserted in the water supply pipe 31 inside the housing 1 a. When the water supply valve 31a is opened, tap water is introduced into the cleaning water introduction / derivation section G as cleaning water.

  Moreover, the pump 11 is connected to the washing water introduction / derivation part G via the piping 11a. As a result, the internal space of the pump 11 communicates with the internal space of the cleaning water introduction / derivation part G and the water supply pipe 31. A drain pipe 32 extending to the outside of the housing 1 a and a water diversion mechanism 16 are attached to the pump 11. In the present embodiment, a reversible rotary pump is used as the cleaning and draining pump 11.

  A fan 28 is provided on the side of the pump 11. The fan 28 supplies gas into the cleaning tank 2 from the back surface of the cleaning tank 2 through a gas introduction pipe (not shown). Thereby, an air flow is generated in the internal space of the cleaning tank 2 in the drying process of the object to be cleaned 10 described later.

  In the dishwasher 1, when the object to be cleaned 10 is washed or rinsed, first, the water supply valve 31 a is opened, and then the washing water 12 is washed into the storage part 12 through the washing water introduction / derivation part G and the drain port 12 a. Water (tap water) is supplied.

  After a predetermined amount of washing water is stored in the storage unit 12, the motor of the pump 11 rotates in the forward direction. Thereby, the cleaning water stored in the storage unit 12 is sucked by the pump 11 and is pumped to each cleaning nozzle via the water diversion mechanism 16. Washing water is sprayed from the liquid spraying port of the rotary cleaning nozzle 3 toward the object to be cleaned 10 accommodated in the lower tableware basket 9. At this time, the pump 11 operates as a cleaning pump 11b. Further, the cleaning water is sprayed from the liquid injection port of the rotary cleaning nozzle 7 toward the object to be cleaned 10 accommodated in the upper table basket 8. When cleaning water is ejected from the rotary cleaning nozzles 3 and 7, the rotary cleaning nozzles 3 and 7 rotate around the vertical axis due to a reaction force that acts on the blades as the cleaning water is injected. Further, the cleaning water is also ejected from the liquid ejection port of the fixed cleaning nozzle 5 disposed on the back surface of the cleaning tank 2.

  In the dishwasher 1 described above, when the washing or rinsing of the object to be cleaned 10 is completed, the motor of the pump 11 rotates in the reverse direction. Accordingly, the cleaning water stored in the storage unit 12 and the cleaning water remaining in the water diversion mechanism 16 are sucked by the pump 11 through the drain port 12a and the cleaning water introduction / derivation unit G, and the outside of the cleaning tank 2 through the drain pipe 32. To be discharged. At this time, the pump 11 operates as a drainage pump 11c.

  FIG. 2 is a block diagram showing the configuration of the control system of the dishwasher according to one embodiment of the present invention. As shown in FIG. 2, the dishwasher 1 includes control means 70. The control means 70 is connected to the water level detection means 4, the temperature detection means 17, the notification means 18, the display means 15, and the load driving means 27. The control means 70 controls each of these connected means, and performs a preheating process, a heat washing process, a rinse process, a heating rinse process, and a drying process.

  The control means 70 can notify the user when the dishwasher 1 breaks down by the display means 15 such as a lamp or the notification means 18 such as a buzzer. The control means 70 detects the temperature of the cleaning water in the cleaning tank 2 by the temperature detection means 17. The control means 70 uses the load driving means 27 to heat the washing pump 11b, the drainage pump 11c, the water supply valve 31a, the washing water as a load, and the heater 14 for drying the dishes and the dishes to dry the dishes. The fan 28 is turned on and off. The control means 70 supplies water by opening and closing the water supply valve 31a in the cleaning tank 2, and supplies water until the water level detecting means 4 reaches a predetermined water level. The predetermined water level is set to a water level at which the heater 14 is sufficiently below the water surface. The commercial power supply 26 is supplied to the control means 70 and the load.

(2) Outline of Operation of Dishwasher An outline of operation of the dishwasher 1 will be described. FIG. 3 is a flowchart showing an outline of the operation of the dishwasher 1.

  As shown in FIG. 3, first, the cleaning water remaining in the cleaning tank 2 is discharged, and tap water is supplied from the water supply pipe 31 into the reservoir 12 by opening the water supply valve 31a (step S1: drainage). / Water supply process).

  Thereafter, cleaning water is obtained by a detergent added to the tap water supplied into the cleaning tank 2, and the cleaning water is heated by turning on the heater 14 for a predetermined time. This gradually increases the temperature of the cleaning water. At this time, the cleaning pump 11b is not operated (step S2: preheating step).

  Next, the washing water is pumped to each washing nozzle by the pump 11 (washing pump 11b) via the water diversion mechanism 16. As a result, cleaning water is jetted from the rotary cleaning nozzles 3 and 7 and the fixed cleaning nozzle 5 to the object to be cleaned 10, and the object to be cleaned 10 is cleaned. Further, the cleaning water is heated to a predetermined temperature by the heater 14 (step S3: heating cleaning process). In this case, the cleaning water sprayed on the article to be cleaned 10 flows into the storage unit 12 through the wall surface of the cleaning tank 2 and is stored in the storage unit 12 again. The cleaning water stored in the storage unit 12 is again pumped by the pump 11 and sprayed from the cleaning nozzles 3, 5, 7 to the object to be cleaned 10. As described above, the cleaning water circulates inside the cleaning tank 2 when the object to be cleaned 10 is cleaned.

  When the cleaning of the object to be cleaned 10 is completed, the cleaning water used for cleaning the object to be cleaned 10 is discharged through the drain pipe 32 by the pump 11 (drainage pump 11c). And tap water is again supplied to the storage part 12 of the washing tank 2 by opening the water supply valve 31a (step S4: drainage / water supply process).

  Next, the tap water supplied into the cleaning tank 2 is pumped by the pump 11 as cleaning water. As a result, the cleaning water is sprayed from the cleaning nozzles 3, 5, and 7 to the object 10 to be cleaned, and the object 10 to be cleaned is rinsed (step S5: rinsing step).

  When rinsing of the object to be cleaned 10 is finished, the cleaning water used for rinsing is discharged through the drain pipe 32 by the pump 11. And tap water is again supplied to the storage part 12 of the washing tank 2 by opening the water supply valve 31a (step S6: drainage / water supply process).

  Next, by operating the heater 14, the tap water stored in the storage unit 12 is heated to a predetermined temperature. And the heated tap water is pumped by the pump 11 as washing water. As a result, the cleaning water heated to a predetermined temperature is jetted from the cleaning nozzles 3, 5, and 7 to the object to be cleaned 10, and the object 10 to be cleaned is rinsed (step S7: heating rinse process). In this case, the object to be cleaned 10 can be sterilized by heat, and the drying efficiency of the object to be cleaned 10 in the subsequent drying process can be increased.

  When the heat rinsing of the article to be cleaned 10 is finished, the cleaning water used for the heat rinsing is discharged through the drain pipe 32 by the pump 11 (step S8: drainage process).

  Finally, the operation of the pump 11 is stopped and the fan 28 in FIG. 1 is operated. The fan 28 introduces outside air into the internal space of the cleaning tank 2 and generates an air flow. Thereby, the atmosphere heated to a predetermined temperature by the heater 14 circulates inside the cleaning tank 2, and high-humidity air is exhausted from the cleaning tank 2. Thereby, the to-be-cleaned object 10 is dried (step S9: drying process). A series of operation | movement in the dishwasher 1 is complete | finished when drying of the to-be-cleaned object 10 is completed.

(3) Details of the operation during the preheating step First, the power of the heater 14 and the power supply voltage of the commercial power supply 26 supplied to the dishwasher 1 are constant, and the ambient temperature of the dishwasher 1 (including the temperature of tap water) is included. The temperature rise of the cleaning water in the cleaning tank 2 in the preheating step in the case of different) will be described. FIG. 4 is a timing chart showing changes in the temperature of the washing water from the start of operation by the control means 70 to the heating washing step when the power and the power supply voltage of the heater 14 are constant and the ambient temperature of the dishwasher 1 is different. It is. FIG. 6 is a flowchart showing a process for determining a threshold value for determining the amount of tableware (object to be cleaned 10) from the temperature rise value of the cleaning water in the preheating step by the control means 70.

  As shown in FIG. 6, after the operation is started, after the drainage process (step S101) and the water supply process (step S102) are performed, the preheating process is performed. In the preheating step, the heater 14 is turned on (step S103), and the temperature of the cleaning water is measured by the temperature detection means 17 (step S104). Here, as shown to (a) in FIG. 4, when the ambient temperature of the dishwasher 1 is high (summer etc.), the temperature of washing water also becomes high. As shown in FIG. 4B, when the ambient temperature of the dishwasher 1 is low (eg, in winter), the temperature of the washing water is also low. However, in the preliminary heating process, the temperature increase value ΔT of the washing water that rises when the heater 14 is turned on depends on the power of the heater 14 and the value of the power supply voltage of the commercial power supply supplied to the dishwasher 1. If the power and the power supply voltage of the heater 14 are constant, the value of the temperature increase value ΔT is substantially equal regardless of the temperature around the dishwasher 1 (ΔTa = ΔTb in FIG. 4). This is because, even if a heater with a rated power of 1000 W is used, the heater 14 generally has an element variation of about ± 100 W.

  By measuring this temperature rise value ΔT, it is possible to estimate the power of the heater 14 and the magnitude of the power supply voltage without being affected by the temperature around the dishwasher 1.

  When the preheating step is completed (Yes in step S105), a threshold value for determining the amount of tableware is determined from the temperature increase value ΔT (step S106). This threshold value is as shown in FIG. 10 and will be described in detail later. When the threshold value is determined, the heater 14 is turned off (step S107), a heat cleaning process is performed (step S108), and the process proceeds to the next process.

Next, as shown in FIG. 5 between (c) and (d), even if the temperature around the dishwasher 1 (the temperature of tap water) is the same, the power and the power supply voltage of the heater 14 are different. The case will be described. FIG. 5 is a timing chart showing changes in the temperature of the washing water from the start of operation by the control means 70 to the heating washing process when the power supply voltage of the dishwasher 1 and the power of the heater 14 are different.

  When the MAX product with the power variation of the heater 14 or the power supply voltage is high, the amount of heat generated by the heater 14 increases, and thus the temperature rise value ΔT of the cleaning water in the preheating process increases (in FIG. 5 (c)). Show). On the contrary, when the MIN product with the power variation of the heater 14 or the power supply voltage is low, the amount of heat generated by the heater 14 is small, so the temperature increase value ΔT of the cleaning water is small (indicated by (d) in FIG. 5). ). That is, ΔTc> ΔTd in FIG.

  In the preheating step, the cleaning pump 11b is not operated. When the pump 11 is operated, the washing water is sprayed and hits the tableware. Therefore, the temperature rise value of the washing water changes depending on the amount of the tableware, and the power of the heater 14 and the power supply voltage cannot be accurately estimated.

  Moreover, as shown in FIG. 10, when the temperature rise value ΔT of the washing water during the preheating step is less than 30 deg, the threshold value for determining the amount of tableware is set to 4 deg. When the temperature rise value ΔT is 30 deg or more and less than 35 deg, the threshold value for determining the amount of tableware is set to 5 deg. When the temperature rise value ΔT is 35 degrees or more, the threshold value for determining the amount of tableware is set to 6 degrees.

(4) Details of operation during heating rinse process A method for determining the amount of tableware during the heating rinse process will be described. FIG. 7 is a timing chart showing the operation from the end of the rinsing process to the end of the drying process when the amount of tableware by the control means 70 is large. FIG. 8 is a timing chart showing the operation from the end of the rinsing process to the end of the drying process when the amount of tableware by the control means 70 is small. FIG. 9 is a flowchart showing an operation for determining the amount of tableware during the heating rinsing process by the control means 70.

  As shown in FIG. 9, after the rinsing process is completed, the draining process (step S10) and the water supply process (step S11) are performed, and then the heating rinsing process is performed. In the heating rinsing process, the heater 14 is turned on (step S12), the cleaning pump 11b is turned on, and cleaning water is jetted (step S13). After a predetermined time, the temperature rise value ΔS for 1 minute of washing water is measured (step S14).

  Here, as shown in FIG. 7, when the amount of tableware is large, the temperature rise value ΔS <b> 1 of the cleaning water due to the heating of the heater 14 becomes gentle (smaller) in the heating and rinsing process. This is because since the amount of tableware is large, the cleaning water sprayed by the cleaning pump 11b hits the tableware and loses heat. Therefore, as the amount of tableware increases, the temperature rise of the washing water becomes milder. On the other hand, as shown in FIG. 8, when the amount of tableware is small, the temperature increase value ΔS2 of the cleaning water for 1 minute increases rapidly (becomes larger). In this way, the amount of tableware can be determined by the inclination of the temperature rise of the washing water.

  However, the temperature rise value of the cleaning water is greatly influenced by the power of the heater 14 and the power supply voltage. That is, when the power of the heater 14 is large or the power supply voltage is large, the temperature rise value ΔS of the cleaning water also increases, and it is erroneously determined that the amount of tableware is small. Further, when the power of the heater 14 is small or the power supply voltage is small, the temperature rise value ΔS of the washing water is also small, and it is erroneously determined that the amount of tableware is large.

In the present invention, the washing water is heated without operating the washing pump 11b in the preheating step, thereby estimating the power and power supply voltage of the heater 14, and the temperature rise value ΔT of the washing water in the preheating step. The amount of tableware is accurately determined from the temperature rise value ΔS of the washing water in the heating rinse process. An example of this will be specifically described below.

  When the power or power supply voltage of the heater 14 is small, that is, when the temperature rise ΔT during preheating is less than 30 deg, the threshold for determining the amount of tableware is 4 deg (see FIG. 10), and the heating rinsing step If the temperature rise value ΔS of the water at the time exceeds 4 deg, it is determined that the amount of tableware is small, and if the temperature increase value ΔS of the water during the heating rinse process is 4 deg or less, it is determined that the amount of tableware is large. .

  In addition, when the power or power supply voltage of the heater 14 is large, that is, when the temperature rise ΔT during preheating is 35 deg or more, the threshold value for determining the amount of tableware is 6 deg. When the temperature rise value ΔS of the water exceeds 6 deg, it is determined that the amount of tableware is small, and when the temperature increase value ΔS of water during the heating rinsing process is 6 deg or less, it is determined that the amount of tableware is large.

  When the power and power supply voltage of the heater 14 are almost standard, that is, when the temperature rise value ΔT during the preheating is 30 deg or more and less than 35 deg, the threshold value for determining the amount of tableware is 5 deg, and the heating rinsing process If the temperature rise value ΔS of water at the time exceeds 5 deg, it is determined that the amount of tableware is small, and if the temperature increase value ΔS of the water during the heating rinse process is 5 deg or less, it is determined that the amount of tableware is large. (Step S15).

  If it is determined that the amount of tableware is large, the heating rinse time is lengthened for 30 minutes (step S16). Thereafter, the heater 14 is turned off (step S17), drainage is performed (step S18), and the drying process is performed. However, since the amount of tableware is large, it is necessary to lengthen the drying time. Therefore, drying is performed for 60 minutes (step S19).

  If it is determined that the amount of tableware is small, the heating rinsing time is shortened for 20 minutes (step S20). Thereafter, the heater 14 is turned off (step S21), drainage is performed (step S22), and the drying process is performed. However, since the amount of tableware is small, the drying can be sufficiently performed even if the drying time is shortened. Therefore, drying is performed for 40 minutes (step S23).

  In this embodiment, the binary determination of whether the amount of tableware is large or small is performed. However, if a plurality of threshold values are provided, the amount of tableware is determined finely, and the heating rinse time and the drying time are set for each. Further, it is possible to perform heating and rinsing with an optimum heating rinsing time, and further to dry the tableware with an optimum drying time.

(5) Effect According to the dishwasher of the present invention, it is possible to accurately determine the amount of tableware without being affected by variations in power supply voltage, ambient temperature of the dishwasher, and heater variations in a general household. Thus, it becomes possible to efficiently perform heating rinsing and drying according to the amount of tableware.

(6) Other Embodiments In the above embodiment, the preheating step and the heat washing step are separated, but the heater 14 is heated without operating the washing pump 11b at the beginning of the heat washing step. But it can be realized.

  In addition, the relationship between the temperature rise value of the water in the preheating process and the threshold value of the amount of tableware was determined by referring to the table, but by determining the threshold value by the relational expression, the threshold value can be set more finely. It is also possible to set.

In addition, the amount of tableware was determined in the heat rinsing step, but the efficiency was further improved by changing the number of times of the heat washing time rinsing step and the heat rinsing step by determining the amount of tableware in the heat washing step as well. It is also possible to make it.

  Further, if the control means 70 detects the power supply voltage, the power of the heater 14 and the power supply voltage can be detected separately, so that the amount of tableware can be determined with higher accuracy.

  INDUSTRIAL APPLICATION This invention can be effectively utilized for the apparatus which wash | cleans to-be-washed objects, such as a dishwasher and a washing dryer, and dries.

DESCRIPTION OF SYMBOLS 1 Dishwasher 2 Washing tank 3, 7 Rotating washing nozzle 5 Fixed washing nozzle 10 To-be-washed object 11 Pump 12 Storage part 14 Heater 15 Display means 17 Temperature detection means 18 Notification means 27 Load drive means 31a Water supply valve 70 Control means

Claims (2)

A dishwasher for cleaning an object to be cleaned, a cleaning tank for storing the object to be cleaned, a heater for heating the cleaning water in the cleaning tank or drying the cleaning object, and detecting the temperature of the cleaning water And a control means for controlling each of the heating and washing process, the rinsing process, and the drying process of the object to be cleaned, and the control means sprays the washing water before performing the heating and washing process. A preheating step of heating the cleaning water by energizing the heater without heating, the degree of increase in temperature of the cleaning water during the preheating step detected by the temperature detection means, and after the rinsing step A dishwasher characterized in that the operation time of the heating and rinsing step is variable based on the degree of temperature rise of the washing water during the heating and rinsing step. The control means is configured to vary the operation time of the drying step from the degree of temperature rise of the washing water during the preheating step and the degree of temperature rise of the washing water during the heating rinsing step. The dishwasher according to claim 1.