JP4121812B2 - Dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dishwasher that cleans an object to be cleaned by spraying cleaning water from a cleaning nozzle provided in a cleaning chamber.
[0002]
[Prior art]
Conventionally, this type of dishwasher has a cleaning nozzle rotatably disposed above and below a cleaning chamber formed in the upper part of the main body, and sprays cleaning water to place dishes (such as dishes and bowls) between them. It is comprised so that the to-be-washed | cleaned object may be wash | cleaned.
[0003]
In this case, a cleaning tank for storing cleaning water is provided below the cleaning chamber, and this cleaning water is supplied to the cleaning nozzle by a pump. A heater is provided in the cleaning tank, and the cleaning water is stored in a predetermined amount. The temperature is kept warm. In addition, the cleaning tank is provided with a water level switch for detecting the water level. The water level switch keeps the inside of the cleaning tank at a predetermined full water level, and the heating of the heater starts when the water level switch detects the full water level. (For example, refer to Patent Document 1 or Patent Document 2).
[0004]
[Patent Document 1]
Utility Model Registration No. 2581334 (pages 3 to 6)
[Patent Document 2]
Japanese Utility Model Publication No. 6-46661 (pages 3 to 7)
[0005]
[Problems to be solved by the invention]
Here, as described above, the water level switch for detecting the full water level in the cleaning tank is usually an electrode type, capacitance sensor type, pressure switch type, etc. Since dirt drops from the object to be cleaned, the cleaning water in the cleaning tank is dirty. Therefore, the water level switch is always exposed to such dirt, and malfunction (false detection) tends to occur due to the dirt.
[0006]
In particular, when the water level switch detects a full water level when there is no cleaning water in the cleaning tank, the heater is in an empty state. On the other hand, since the inside of the cleaning tank is dirty as described above, there is a problem that smoke or a foul odor is generated by such emptying, which is a very undesirable situation in the store.
[0007]
The present invention has been made to solve the conventional technical problem, and provides a dishwasher that can effectively prevent the heating of a heater for heating a washing tank.
[0008]
[Means for Solving the Problems]
A dishwasher according to the present invention performs a washing operation for washing an object to be washed by spraying washing water stored in a washing tank from a washing nozzle provided in a washing chamber. A water level detecting means for detecting the water level in the cleaning tank, a heating means for heating the cleaning water in the cleaning tank, and a control means. When the full water level is detected, heating by the heating means is prohibited.
[0009]
According to the present invention, in a dishwasher that performs a cleaning operation for cleaning an object to be cleaned by spraying cleaning water stored in the cleaning tank from a cleaning nozzle provided in the cleaning chamber, The water level detection means for detecting the water level, the heating means for heating the cleaning water in the cleaning tank, and the control means, the control means, when the power is turned on, the water level detection means is a predetermined full water in the cleaning tank When the position is detected, heating by the heating means is prohibited, so the water level detection means malfunctions due to dirt, etc., and when the full water level is detected from the time the power is turned on when the cleaning tank is normally empty In other words, heating by the heating means is prohibited, and so-called emptying of the cleaning tank can be prevented.
[0010]
A dishwasher according to a second aspect of the present invention comprises temperature detection means for detecting the temperature of the washing water in the washing tank as described above, and the control means is configured such that when the power is turned on, the water level detection means is When the full water level is detected and the temperature of the cleaning water is equal to or higher than a predetermined temperature, heating by the heating means is allowed.
[0011]
According to the invention of claim 2, in addition to the above, the temperature detecting means for detecting the temperature of the cleaning water in the cleaning tank is provided, and the control means is configured so that the water level detecting means is turned on when the power is turned on based on the output of the temperature detecting means. When the full water level is detected and the temperature of the washing water is higher than the predetermined temperature, heating by the heating means is allowed, so the temperature was kept in the washing tank after the previous operation. If the power is turned off without draining the washing water and the washing water is turned on again while it is warm, the water level detection means will not malfunction, and heating by the heating means will be resumed to resume good washing operation. Will be able to.
[0012]
A dishwasher according to a third aspect of the present invention is characterized in that, in each of the above inventions, the control means allows heating by the heating means when the washing operation is executed a predetermined number of times.
[0013]
According to the invention of claim 3, in addition to the above inventions, the control means allows heating by the heating means when the washing operation is executed a predetermined number of times. Even when there is no malfunction, when the cleaning operation is performed a predetermined number of times, it is assumed that there is no malfunction, and heating is performed by the heating means, and thereafter a good cleaning operation can be performed.
[0014]
A dishwasher according to a fourth aspect of the present invention is the dishwasher according to the first aspect of the present invention, wherein the control means supplies water until the inside of the washing tank reaches the full water level when the water level detecting means does not detect the full water level when the power is turned on. When the water level detection means detects the full water level after the start of the water supply operation and the number of executions of the water supply operation is less than the predetermined number of times, heating by the heating means is prohibited. It is characterized by doing.
[0015]
According to the invention of claim 4, in addition to the invention of claim 1, the control means supplies water until the inside of the washing tank reaches the full water level when the water level detecting means does not detect the full water level when the power is turned on. When the water level detection means detects the full water level after the start of the water supply operation and the number of executions of the water supply operation is less than the predetermined number of times, heating by the heating means is prohibited. Therefore, even if the power level is normal when the power is turned on, the water level detection means subsequently malfunctions, and the water supply operation is stopped due to the detection of the full water level even though the water level in the cleaning tank is low. However, heating by the heating means is prohibited, and the cleaning tank can be prevented from emptying.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of a dishwasher 1 according to the present invention. In this figure, a back plate (not shown) is erected on the rear part of the main body 2 of the dishwasher 1, and a cleaning chamber 3 is defined on the front side of the back plate and located on the upper portion of the main body 2. The upper surface, front surface, and left and right side surfaces of the cleaning chamber 3 are closed by a box-shaped door 17, and the door 17 moves up and down and is opened and closed.
[0017]
An upper cleaning nozzle 4 having a plurality of cleaning nozzle ports for spraying cleaning water downward is rotatably disposed above the cleaning chamber 3, and the upper cleaning nozzle 4 is slightly below the upper cleaning nozzle 4. And an upper rinse nozzle 5 that rotates concentrically with each other. The upper rinsing nozzle 5 has a plurality of rinsing nozzle ports for injecting rinsing water downward.
[0018]
A lower cleaning nozzle 6 having a plurality of cleaning nozzle ports for spraying cleaning water upward is rotatably disposed in the lower portion of the cleaning chamber 3. Rinse water is directed upward slightly above the lower cleaning nozzle 6. A lower rinsing nozzle 7 having a plurality of rinsing nozzle ports for spraying is disposed concentrically with the lower cleaning nozzle 6.
[0019]
A rack rail 8 is provided between the upper and lower cleaning nozzles 4 and 6 and the rinsing nozzles 5 and 7 for placing a rack for storing dishes to be cleaned.
[0020]
Further, at the lower part of the main body 2, a booster tank 10 for heating water supplied from an external water supply via a water supply electromagnetic valve 9 (this booster tank 10 is also provided with a temperature sensor and a water level switch not shown), A heater (electric heater) 11 for heating the water in the booster tank 10, a rinse water pipe 12 for feeding the rinse water heated in the booster tank 10 to the rinse nozzles 5 and 7, and the rinse water A rinsing pump 13 that pumps water to the rinsing nozzles 5 and 7 through the pipe 12, a cleaning tank 14 that stores the cleaning water ejected from the rinsing nozzles 5 and 7, and a heater for heating the cleaning water in the cleaning tank 14 (Electric heater as heating means) 16 and cleaning water in the cleaning tank 14 (warm water of about + 60 ° C. to + 65 ° C. mixed with detergent) And Kyusuru washing pump 15 feeding through a wash water pipe 18 to the cleaning nozzle 4,6, and a control panel (not shown) for controlling the operation of the dishwasher 1.
[0021]
A water level switch (electrode type, capacitance type, etc.) 21 as a water level detecting means for detecting a predetermined full water level in the cleaning tank 14 is provided at a predetermined full water level position of the cleaning tank 14. Is provided. Further, the temperature of the cleaning water in the cleaning tank 14 is detected by a temperature sensor 22 as temperature detecting means. Reference numeral 23 denotes an overflow pipe provided upright in the cleaning tank 14.
[0022]
The outputs of the water level switch 21 and the temperature sensor 22 are input to a control device (control means) (not shown) provided on the control panel, and the operation of the dishwasher 1 is controlled by this control device as will be described later. .
[0023]
The operation of the dishwasher 1 according to the embodiment will be described with reference to the flowchart of FIG. FIG. 2 shows a flowchart of the operation of a part of the control device. When the power switch (not shown) of the dishwasher 1 is turned on in step S1 and the power is turned on, the control device first determines whether the water level switch 21 is turned on or off in step S2. If the cleaning tank 14 is not at the full water level and the water level switch 21 is OFF, the process proceeds to step S3 to execute a hot water supply operation as a water supply operation.
[0024]
In this hot water supply operation, the control device opens the water supply electromagnetic valve 9 connected to an external water pipe, and supplies rinse water to the booster tank 10. When the booster tank 10 becomes full, the water supply electromagnetic valve 9 is closed and the heater 11 provided in the booster tank 10 is operated to heat the rinse water in the booster tank 10. When the rinse water is heated to a predetermined temperature, the rinse pump 13 is operated to feed the rinse water in the booster tank 10 to the upper and lower rinse nozzles 5 and 7 via the rinse water pipe 12.
[0025]
The rinsing water supplied from the rinsing water pipe 12 is supplied into the rinsing nozzles 5 and 7 and is jetted into the cleaning chamber 3 from a plurality of nozzle openings formed in the rinsing nozzles 5 and 7. Thereafter, the rinse water is stored in the washing tank 14 and becomes washing water.
[0026]
Since the water supply to the booster tank 10 is not in time, in the embodiment, the hot water supply operation is performed about 10 times, and the cleaning tank 14 becomes full. Therefore, when the first hot water supply operation is completed, the control device proceeds to step S4, determines whether or not the current number of hot water supply operations is within two times, and if within two times, proceeds to step S5. It is determined whether the water level switch 21 is ON. Normally, at this time, the water level is not full, so the water level switch 21 is OFF and the process returns to step S3.
[0027]
Then, the hot water supply operation is performed again. When the process proceeds to step S4 and the hot water supply operation is performed more than twice, the process proceeds to step S6 and it is determined whether the water level switch 21 is ON or OFF. If the inside of the washing tank 14 is not full and the water level switch 21 is OFF, the control device returns to step S3 and executes the hot water supply operation again.
[0028]
In this way, when the hot water supply operation is performed a plurality of times (for example, 10 times) and the cleaning tank 14 is full and the water level switch 21 is turned on, the control device proceeds from step S6 to step S7 and energizes the heater 16. Heating of the cleaning water stored in the cleaning tank 14 is started, and a standby state is entered.
[0029]
In step S7, the control device controls energization to the heater 16 and keeps the cleaning water in the cleaning tank 14 at the set temperature of + 60 ° C to + 65 ° C.
[0030]
In such a standby state, the door 17 is opened, and an object to be cleaned such as dishes such as dishes is stored in the cleaning chamber 3 between the upper and lower rinse nozzles 5 and 7 (upper and lower cleaning nozzles 4 and 6), and the door 17 is closed. Then, the control device starts the cleaning operation of the dishwasher 1.
[0031]
When this cleaning operation is started, the control device operates the cleaning pump 15 to supply the cleaning water in the cleaning tank 14 to the upper and lower cleaning nozzles 4 and 6 through the cleaning water pipe 18, and the respective cleaning nozzles. The object to be cleaned in the cleaning chamber 3 is cleaned by spraying into the cleaning chamber 3 from the mouth.
[0032]
When a predetermined cleaning time has elapsed, the rinsing pump 13 is operated, and the rinsing water in the booster tank 10 is supplied to the upper and lower rinsing nozzles 5 and 7 through the rinsing water pipe 12. Similarly to the above, the rinse water supplied from the rinse water pipe 12 is supplied to the inside of the rinse nozzles 5 and 7 and is ejected from a plurality of nozzle ports formed in the rinse nozzles 5 and 7.
[0033]
Thus, the object to be cleaned in the cleaning chamber 3 is rinsed with the rinsing water sprayed into the cleaning chamber 3 from the respective rinse nozzle ports. After such a rinsing operation is executed for a predetermined time, the control device stops the rinsing operation and enters a standby state again.
[0034]
Here, if the water level switch 21 becomes dirty due to dirt in the cleaning tank 14 or the like, a malfunction occurs in which the switch is turned on even though there is no cleaning water. When the power switch is turned on in such a malfunction state, the control device proceeds from step S2 to step S8. Then, it is determined whether or not the temperature of the cleaning water in the cleaning tank 14 is + 40 ° C. or higher. If NO, the process proceeds to step S9, the energization of the heater 16 is prohibited (OFF), and the standby state is set.
[0035]
Thereby, emptying of the cleaning tank 14 is prevented. In this case, the control device displays a predetermined alarm (for a service person) inside the main body 2 (may be performed on the control panel for the user). Thereafter, as described above, the cleaning operation and the rinsing operation are executed by the user's operation. In this case, since the operation without the cleaning water is performed, the user easily notices the abnormality. Request maintenance.
[0036]
On the other hand, if the temperature of the cleaning water in the cleaning tank 14 is + 40 ° C. or higher based on the output of the temperature sensor 22 in step S8, the control device proceeds to step S7 and starts energizing the heater 16 and enters a standby state. That is, after the previous operation, the power is turned off without discharging the washing water (full water level) kept in the washing tank 14 and the washing water is at + 40 ° C. or higher (this value is higher than the normal room temperature). When the power is turned on again while it is warm, the water level switch 21 is not malfunctioning. Therefore, in that case, heating by the heater 16 is performed so that a good cleaning operation can be resumed thereafter.
[0037]
In addition, as described above, after the previous operation, the power is turned off without discharging the cleaning water in the cleaning tank 14 and left for a long time, that is, after the temperature of the cleaning water becomes lower than + 40 ° C., the power is turned on again. If it is turned on, the control proceeds from step S2 to step S8 and step S9 even though the water level switch 21 is not malfunctioning. When the multiple cleaning operation is executed, the heater 16 is energized and the above-described control is executed.
[0038]
When the washing operation is started in the standby state in step S9, if the water level switch 21 is normal, the washing operation is performed with washing water having a low temperature. Therefore, in that case, it is determined that there is no malfunction after the washing operation is performed three times, and the heating of the heater 16 is resumed.
[0039]
Even if the water level switch 21 is normal when the power is turned on, a malfunction may occur thereafter. In that case, although the water level in the cleaning tank 14 is low, the full water level is detected and the hot water supply operation is stopped. However, the control device proceeds from step S4 to step S5, and the hot water supply operation is performed within two times. However, if the water level switch 21 is ON, the process proceeds to step S9 to prohibit the energization of the heater 16 and enter the standby state.
[0040]
This similarly prevents emptying of the cleaning tank 14. In this case as well, the control device displays the same alarm as described above. Thereafter, as described above, the washing operation and the rinsing operation are executed by the user's operation. In this case, the operation is performed in a state where there is little or no washing water. The person notices the abnormality and requests maintenance.
[0041]
Note that the values of the temperature and the number of times shown in the embodiments are not limited thereto, and are appropriately determined according to the performance and capacity of the device.
[0042]
【The invention's effect】
As described above in detail, according to the present invention, in a dishwasher that performs a cleaning operation for cleaning an object to be cleaned by spraying cleaning water stored in a cleaning tank from a cleaning nozzle provided in the cleaning chamber. And a water level detecting means for detecting the water level in the cleaning tank, a heating means for heating the cleaning water in the cleaning tank, and a control means. When a predetermined full water level is detected, heating by the heating means is prohibited, so that the water level detection means malfunctions due to dirt, etc., and the washing tank is normally empty. When the position is detected, heating by the heating means is prohibited, and so-called emptying of the cleaning tank can be prevented.
[0043]
According to the invention of claim 2, in addition to the above, the temperature detecting means for detecting the temperature of the cleaning water in the cleaning tank is provided, and the control means is configured so that the water level detecting means is turned on when the power is turned on based on the output of the temperature detecting means. When the full water level is detected and the temperature of the washing water is higher than the predetermined temperature, heating by the heating means is allowed, so the temperature was kept in the washing tank after the previous operation. If the power is turned off without draining the washing water and the washing water is turned on again while it is warm, the water level detection means will not malfunction, and heating by the heating means will be resumed to resume good washing operation. Will be able to.
[0044]
According to the invention of claim 3, in addition to the above inventions, the control means allows heating by the heating means when the washing operation is executed a predetermined number of times. Even when there is no malfunction, when the cleaning operation is performed a predetermined number of times, it is assumed that there is no malfunction, and heating is performed by the heating means, and thereafter a good cleaning operation can be performed.
[0045]
According to the invention of claim 4, in addition to the invention of claim 1, the control means supplies water until the inside of the washing tank reaches the full water level when the water level detecting means does not detect the full water level when the power is turned on. When the water level detection means detects the full water level after the start of the water supply operation and the number of executions of the water supply operation is less than the predetermined number of times, heating by the heating means is prohibited. Therefore, even if the power level is normal when the power is turned on, the water level detection means subsequently malfunctions, and the water supply operation is stopped due to the detection of the full water level even though the water level in the cleaning tank is low. However, heating by the heating means is prohibited, and the cleaning tank can be prevented from emptying.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a dishwasher according to an embodiment to which the present invention is applied.
FIG. 2 is an operation flowchart of the control device of the dishwasher of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tableware washing machine 3 Washing room 4 Upper washing nozzle 5 Upper rinsing nozzle 6 Lower washing nozzle 7 Lower rinsing nozzle 10 Booster tank 14 Washing tank 16 Heater 21 Water level switch 22 Temperature sensor

Claims (4)

In a dishwasher that performs a washing operation for washing an object to be washed by spraying washing water stored in a washing tank from a washing nozzle provided in a washing chamber,
A water level detecting means for detecting the water level in the washing tank, a heating means for heating the washing water in the washing tank, and a control means,
The control means prohibits heating by the heating means when the water level detection means detects a predetermined full water level in the washing tank when the power is turned on. Temperature detecting means for detecting the temperature of the cleaning water in the cleaning tank,
The control means is based on the output of the temperature detection means, when the water level detection means detects the full water level when the power is turned on, and the temperature of the washing water is equal to or higher than a predetermined temperature. The dishwasher according to claim 1, wherein heating by the heating means is allowed.   3. The dishwasher according to claim 1, wherein the control unit allows heating by the heating unit when the washing operation is executed a predetermined number of times. The control means, when the water level detection means does not detect the full water level when the power is turned on, performs the water supply operation of supplying water until the inside of the cleaning tank reaches the full water level in a plurality of times, and the water supply operation 2. The dishwashing according to claim 1 , wherein, when the water level detection means detects the full water level after the start, if the number of times of the water supply operation is not more than a predetermined number, heating by the heating means is prohibited. Machine.

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