JP2005261625A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher minimizing waste drainage for saving energy, even if a water level sensor or water supply electromagnetic valve is broken down. <P>SOLUTION: The dishwasher 1 includes a water level sensor 27 for detecting a predetermined full water level of a rinsing water tank 22, an overflow pipe 25 raised in the rinsing water tank 22 and opened at a position above the full water level, the water supply electromagnetic valve 30 for controlling water supply to the rinsing water tank 22, and a control means for controlling the water supply electromagnetic valve 30 from the output of the water level sensor 27 so as to maintain the full water level in the rinsing water tank 22. The dishwasher is provided with an overflow sensor 26 for sensing overflow from the overflow pipe 25 and a buzzer 36 operated when the overflow sensor 26 detects the overflow from the overflow pipe 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dishwashing machine that supplies rinsing water from a rinsing water tank to a rinsing nozzle by a pump, and discharges the rinsing water into a washing chamber from the rinsing nozzle to rinse dishes and the like.

  In a conventional dishwasher, a washing nozzle and a rinsing nozzle are rotatably arranged above and below a washing chamber, respectively, and washing and rinsing of an object to be washed such as a dish accommodated between them is performed (see Patent Document 1). ). This dishwasher sprays the wash water in the wash water tank downward from the wash nozzle provided in the upper part of the wash chamber and the upward from the wash nozzle provided in the lower part by the wash water pump. Wash the washed items from above and below and perform the washing operation. Thereafter, the rinsing water in the rinsing water tank is fed to the rinsing nozzles provided above and below the cleaning chamber by the rinsing water pump. The rinsing water is sprayed downward from the rinsing nozzle provided at the upper part, and the detergent and washing water adhering to the object to be washed are washed away from above and below by being jetted upward from the rinsing nozzle provided at the lower part. This rinsing operation is performed to complete one cycle of operation. The rinse water sprayed from the rinse water tank is collected in the wash water tank and used as the wash water for the next cycle. Further, the rinsing water tank is provided with a water level sensor, and when the rinsing water is reduced by the rinsing operation as described above and falls below a predetermined water level, the water supply electromagnetic valve is opened and water is supplied.

The washing water tank and the rinsing water tank are each provided with a heater, and the water stored in these tanks is heated to a predetermined temperature by this heater to be hot water. Thereby, the chemical activity of the detergent was increased, and the cleaning efficiency was improved.
JP 2002-28124 A

  In a conventional dishwasher, if a water level sensor that detects the water level in the water supply solenoid valve or the water rinsing water tank that supplies water to the rinsing water tank fails, water will flow into the rinsing water tank more than necessary. Become. Therefore, there is a problem that water overflows from the rinse water tank to the washing room or the washing water tank, and water that cannot be accommodated in the washing room or the washing water tank leaks outside and contaminates the installation location. In order to avoid such inconvenience, the rinse water tank is provided with an overflow pipe.

  However, this overflow pipe does not notify the user of the failure of the water supply solenoid valve or the water level sensor, so the overflow pipe will continue to overflow until the user recognizes these failures, which is unnecessary. Consumption of fresh water will continue to occur. In addition to this, the rinse water tank is provided with a heater for raising the temperature of the water in the tank, so that the temperature of the water discharged without being used is also raised. Energy loss will occur.

  Therefore, there is a demand from the market for the development of a device that can improve the above-described unnecessary water consumption and energy loss when a water supply solenoid valve or water level sensor fails.

  The dishwasher of the present invention supplies rinsing water from a rinsing water tank to a rinsing nozzle by a pump, and discharges the rinsing water into the washing chamber from the rinsing nozzle to rinse the tableware and the like. A water level sensor for detecting the full water level, an overflow pipe standing in the rinse water tank and opened at a position higher than the full water level, a water supply solenoid valve for controlling water supply to the rinse water tank, and a water level sensor An overflow sensor that detects an overflow from the overflow pipe, and an overflow sensor that detects an overflow from the overflow pipe, and a controller that controls the water supply electromagnetic valve so as to maintain the water level in the rinse water tank at a full water level based on the output. A notification device that operates when an overflow is detected is provided.

  A dishwasher according to a second aspect of the present invention is the dishwasher according to the second aspect of the present invention, wherein a valve is provided to prevent water supply to the rinse water tank when the overflow sensor detects an overflow from the overflow pipe.

  In the dishwasher of the invention of claim 3, in each of the above inventions, the overflow sensor operates independently of the control device.

  In the present invention, in a dishwasher for supplying rinse water from a rinse water tank to a rinse nozzle by a pump and discharging the rinse water into a washing chamber to rinse dishes, a predetermined full water level of the rinse water tank is detected. Based on the output of the water level sensor, the overflow pipe standing in the rinse water tank and opened at a position higher than the full water level, the water supply electromagnetic valve for controlling the water supply to the rinse water tank, and the output of the water level sensor, An overflow sensor that detects an overflow from the overflow pipe, and an overflow sensor that detects an overflow from the overflow pipe, and a controller that controls the water supply solenoid valve to maintain the water level in the rinse water tank at a full water level. For example, a water level sensor or a water supply solenoid valve , Even when such water is supplied continuously to the rinse water tank, it is possible to notify by detecting the overflow from the overflow pipe. As a result, it is possible to minimize wasteful water discharge and contribute to energy saving.

  In the invention of claim 2, in addition to the above, since the valve for preventing the water supply to the rinse water tank is provided when the overflow sensor detects an overflow from the overflow pipe, the overflow of the rinse water can be reliably suppressed. It will be.

  In the invention of claim 3, in addition to the above-mentioned inventions, the overflow sensor operates independently of the control device, so that the rinse water always overflows even when the operation of the dishwasher by the control device is stopped. Can be detected.

  The present invention has been made to solve the conventional technical problems, and even when a water level sensor or a water supply solenoid valve breaks down, the tableware can contribute to energy saving by minimizing the discharge of wasted rinse water. A cleaning machine is provided. Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of the dishwasher 1 of the present invention, FIG. 2 is a sectional view of the dishwasher 1 of the present invention, FIG. 3 is a sectional view of a rinse water tank 22, and FIG. 4 is a control circuit diagram of the dishwasher 1. It is.

  Reference numeral 1 denotes a dishwasher, and an opening 2 </ b> A for storing and taking out a washing rack 5 in which an object to be washed 4 such as tableware is accommodated is formed on the front surface of a main body 2 constituting the dishwasher 1. The cleaning chamber 3 is partitioned. The front opening 2A of the cleaning chamber 3 is closed by the opening / closing door 6 so as to be freely opened and closed. The door 6 is provided with a door switch 7 (only FIG. 4 is shown) for detecting whether the door 6 is opened or closed. An operation panel 33 having a power switch 32 is provided on the upper front surface of the main body 2.

  An upper cleaning arm 8 having a plurality of cleaning nozzles 8A for spraying cleaning water downward is rotatably disposed above the cleaning chamber 3. An upper rinse arm 9 that rotates concentrically with the upper cleaning arm 8 is disposed slightly below the upper cleaning arm 8. The upper rinsing arm 9 has a plurality of rinsing nozzles (not shown) for injecting rinsing water downward. A lower cleaning arm 10 having a plurality of cleaning nozzles 10A for jetting cleaning water upward is rotatably disposed in the lower portion of the cleaning chamber 3. A lower rinsing arm 11 having a plurality of rinsing nozzles (not shown) for jetting rinsing water upward is disposed slightly above the lower cleaning arm 10 so as to be rotatable concentrically with the lower cleaning arm 10.

  On the other hand, a relatively large cleaning water tank 14 is provided below the cleaning chamber 3 and separated from the cleaning chamber 3 by a filter 13. An overflow pipe 15 is erected in the washing water tank 14 and opens into the washing water tank 14 at a position where the washing water surface of the washing water tank 14 is regulated to a predetermined water level. Further, a cleaning water tank heater 16 (only FIG. 4 is shown) is accommodated in the cleaning water tank 14 in order to maintain the cleaning water at a predetermined temperature. Further, in order to detect the water temperature in the cleaning water tank 14, a cleaning water tank temperature sensor 17 (only FIG. 4 is shown) is inserted from the outer wall below the water level. The cleaning water stored in the cleaning water tank 14 is mixed with a detergent. The cleaning water is sucked and pumped by the cleaning water pump 18, and the upper and lower cleaning nozzles are discharged via the discharge pipe 19 and the cleaning pipe 20. It feeds to the upper and lower cleaning arms 8 and 10 where 8A and 10A are formed.

  On the other hand, a rinsing water tank 22 for storing high-temperature rinse water at + 85 ° C. is disposed at the lower part of the main body 2. The stored water in the rinsing water tank 22 is pumped by a rinsing water pump 23 and is fed via a rinsing pipe 24 to upper and lower rinsing arms 9 and 11 in which upper and lower rinsing nozzles are formed. Further, as shown in FIG. 3, an overflow pipe 25 for regulating the water level is connected in the rinse water tank 22 and is constituted by a float switch located at substantially the same height as the position where the overflow pipe 25 is provided. An overflow sensor 26 is provided. In addition to the overflow sensor 26, a rinse water tank water level sensor 27 for detecting the water level in the rinse water tank 22 is provided in the rinse water tank 22.

  A rinse water tank heater 28 is accommodated in the rinse water tank 22 in order to heat the stored water to the predetermined temperature. Further, in order to detect the water temperature in the rinsing water tank 22, a rinsing water tank temperature sensor 29 (shown only in FIG. 4) is inserted from the outer wall below the water level. The rinsing water tank 22 is supplied with rinsing water from an external water pipe (not shown) through a water supply piping 31 provided with a water supply electromagnetic valve 30, and is also supplied to the rinsing water tank 22 by the water supply electromagnetic valve 30. Water supply control is performed.

  Next, the control circuit of the present invention will be described with reference to FIG. In FIG. 4, reference numeral 42 denotes a cleaning water level sensor (cleaning water tank water level sensor) 43 provided in the cleaning water tank 14, the rinsing water tank water level sensor 27, the rinsing water tank temperature sensor 17, and the rinsing water tank. A control board to which an operation panel 33 provided with a temperature sensor 29 and a power switch 32 is connected. The control board is composed of a general-purpose microcomputer (control means), and an AC power source 35 is obtained from a board transformer 44.

  Reference numeral 36 denotes a buzzer (notification device) that operates when an overflow in the rinse water tank 22 is detected, and is controlled by the overflow sensor 26. The rinse water tank heater 28 is connected in series with a high limit thermostat 37 and is controlled by a switch relay S1. The washing water tank heater 16 is connected in series with a high limit thermostat 38 and is controlled by a switch relay S2. Reference numeral 40 denotes a washing water pump motor for the washing water pump 18, which is controlled by a switch relay S3. Reference numeral 41 denotes a rinse water pump motor for the rinse water pump 23, which is controlled by a switch relay S4. The water supply electromagnetic valve 30 is controlled by a switch relay S5. These are connected in parallel, and are controlled by the control board 42 controlling the switch relays S1, S2, S3, S4, and S5 during automatic operation.

  The door switch 7 is connected via a door relay RL and is connected to the control board 42 from between the door switch 7 and the door relay RL. The door relay RL is for turning on and off the door relay contact 45, and the door relay contact 45 is connected in series to the switch relay S3 and the switch relay S4.

  With the above configuration, the operation of the dishwasher 1 of the present invention will be described. First, when the power switch 32 provided on the operation panel 3 of the dishwasher 1 is turned on, the microcomputer of the control board 42 energizes the switch relay S5, opens the water supply electromagnetic valve 30 from the contact point, and rinses water. Rinsing water is supplied into the tank 22. This rinse water is stored in the rinse water tank 22. At this time, the microcomputer of the control board 42 energizes the switch relay S4 and operates the rinse water pump motor 41 from the contact. Accordingly, the rinsing water is gradually pumped up by the rinsing water pump 23 and is pumped to the upper and lower rinsing nozzles 9 and 11 through the rinsing pipe 24.

  The pumped rinse water is discharged from the upper and lower rinse nozzles and stored in the lower wash water tank 14. When each tank 14 and 22 reaches a predetermined water level based on the outputs of the water level sensors 27 and 43, the microcomputer of the control board 42 cuts off the power supply to the switch relay S5 and closes the water supply electromagnetic valve 30. Further, the switch relays S1 and S2 are energized to energize the washing water tank heater 16 and the rinsing water tank heater 28, and heat the water in the tanks 14 and 22 until the water temperature reaches a predetermined temperature.

  Thereafter, the rinse water in the rinse water tank 22 is maintained at + 85 ° C. by the action of the rinse water tank temperature sensor 29, and the wash water in the wash water tank 14 is maintained at + 65 ° C. by the action of the wash water tank temperature sensor 17. . In addition, a detergent is introduced into the cleaning water tank 14 so as to obtain an appropriate concentration.

  Thereafter, when the user places the cleaning rack 5 on which the object to be cleaned 4 such as a dish is placed in the cleaning chamber 3 and closes the door 6, the microcomputer of the control board 42 energizes the switch relay S3. The cleaning water pump motor 40 is operated by the contact. As a result, the cleaning water pump 18 starts rotating, the cleaning water is pumped to the upper and lower cleaning arms 8 and 10, and the dirt adhering to the object to be cleaned 4 is washed away by the cleaning water sprayed from the cleaning nozzles 8 </ b> A and 10 </ b> A. . Incidentally, the energization of the washing water pump motor 40 and the rinsing water pump motor 41 by the door relay RL is not performed unless the door relay contact 45 is turned on unless the door switch 7 is turned on, so that the door 6 is not closed. Not done.

  The washing water sprayed as described above falls into the washing water tank 14 below, is again sucked into the washing water pump 18, and thereafter circulates through the same route. After performing this operation for a preset time, the microcomputer of the control board 42 cuts off the power supply to the switch relay S3, whereby the power supply to the washing water pump motor 40 is cut off and the washing water pump is turned off. 18 stops.

  Next, the microcomputer of the control board 42 energizes the switch relay S4, energizes the motor 41 through the contact point, rotates the rinse water pump 23, and rotates the high temperature rinse water of + 85 ° C. to the upper and lower rinse arms 9. , 11 to pump. Thereby, the detergent and washing water adhering to the surface of the article to be cleaned 4 are rinsed off by the rinsing water sprayed from the rinsing nozzle.

  After performing this operation for a preset time, the microcomputer of the control board 42 cuts off the energization to the switch relay S4, whereby the energization of the rinse water pump motor 41 is cut off and the rinse water pump is turned off. 23 stops. Thereafter, a buzzer (not shown) is sounded to notify the completion of the cleaning operation. The rinse water falls into the lower wash water tank 14 and is reused as wash water for the next step.

  The rinsing water in the rinsing water tank 22 decreases when rinsing is performed. Therefore, based on the low water level detection by the rinse water tank water level sensor 27, the microcomputer of the control board 42 energizes the switch relay S5, opens the water supply electromagnetic valve 30, and supplies water. Then, based on the detection of the full water level by the rinse water tank water level sensor 27, the microcomputer of the control board 42 cuts off the power supply to the switch relay S5, closes the water supply electromagnetic valve 30, and stops the water supply.

  Here, when a detection failure due to a failure of the rinse water tank water level sensor 27 or a failure of the water supply electromagnetic valve 30 occurs and the water supply electromagnetic valve 30 does not close, water supply to the rinse water tank 22 occurs continuously. The water level rises and the rinse water overflows from the overflow pipe 25.

  At this time, in this embodiment, the overflow sensor 26 provided in the rinsing water tank 22 detects the overflow of the rinsing water, and based on this, the microcomputer of the control board 42 sounds the buzzer 36 as a notification device to rinse the rinsing water. The user is notified that an overflow has occurred in the tank 22. As a result, the user can recognize that an abnormality has occurred in the rinse water tank water level sensor 27 or the water supply electromagnetic valve 30, and therefore can minimize wasteful discharge of rinse water. Further, since it is possible to immediately recognize that the overflow has occurred, it is possible to avoid unnecessary energization to the rinse water tank heater 28 for heating the rinse water in the rinse water tank 22, thereby saving energy. Can also contribute.

  In particular, in this embodiment, the overflow sensor 26 that controls energization to the buzzer 36 as a notification device is provided so as to operate independently of the control board 42, so that the power switch 32 of the operation panel 33 is provided. Even in the OFF state, it is possible to detect an overflow of rinse water at all times. Therefore, even if the water supply electromagnetic valve 30 breaks down while the dishwasher 1 is not used and water is continuously supplied to the rinse water tank 22, the rinse water quickly overflows by the buzzer 36. Therefore, it is possible to further inform the user that the waste water is discharged.

  In addition to the above embodiment, a valve device for blocking water supply to the rinse water tank 22 based on the output of the overflow sensor 26 may be provided upstream or downstream of the water supply electromagnetic valve 30. Thereby, the overflow of rinse water can be suppressed reliably.

It is a perspective view of the dishwasher of this invention. It is sectional drawing of the dishwasher of this invention. It is sectional drawing of a rinse water tank. It is a control circuit diagram of a dishwasher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dishwasher 2 Main body 3 Washing room 7 Door switch 14 Washing water tank 18 Washing water pump 22 Rinsing water tank 23 Rinsing water pump 25 Overflow pipe 26 Overflow sensor 27 Rinsing water tank water level sensor 28 Rinsing water tank heater 29 Rinsing water tank temperature Sensor 30 Water supply solenoid valve 32 Power switch 33 Operation panel 36 Buzzer 40 Washing water pump motor 41 Rinsing water pump motor 42 Control board

Claims (3)

In a dishwasher for supplying rinse water from a rinse water tank to a rinse nozzle by a pump and discharging the rinse water from the rinse nozzle into a washing chamber to rinse dishes, etc.
A water level sensor for detecting a predetermined full water level of the rinse water tank;
An overflow pipe standing in the rinse water tank and opened at a position higher than the full water level;
A water supply solenoid valve for controlling water supply to the rinse water tank;
A control device for controlling the water supply electromagnetic valve so as to maintain the water level in the rinse water tank at the full water level based on the output of the water level sensor;
A dishwasher comprising an overflow sensor for detecting an overflow from the overflow pipe and a notification device that operates when the overflow sensor detects an overflow from the overflow pipe.   2. The dishwasher according to claim 1, further comprising a valve for preventing water supply to the rinse water tank when the overflow sensor detects an overflow from the overflow pipe.   3. The dishwasher according to claim 1, wherein the overflow sensor operates independently of the control device.

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