JPS5818832Y2 - Dishwasher - Google Patents

Description

[Detailed description of the invention] The present invention relates to a dishwasher that is equipped with an electric booster that supplies hot water into a washing tank and performs washing using the supplied hot water, and in particular relates to an improved hot water supply circuit. The purpose is to not supply water into the booster tank of the electric booster when the water is being heated, and to always supply hot water at the set water temperature.Also, for safety reasons, the heater, which is the heat source of the electric booster, is turned off during hot water supply. The purpose is to provide a dishwasher that is effective.

An embodiment of the present invention will be described below based on the drawings.

A dishwasher main body 1 and an electric booster 2 are arranged side by side, a washing tank 4 is formed below a washing chamber 3 in the upper part of the main body 1, and a dish storage basket 5 is arranged above the washing tank 4.
A rinsing nozzle 6 is disposed above the rinsing nozzle 6.
is connected to a booster tank 8 constituting the electric booster 2 via a hot water pump 7.

In addition, a washing pump 9 is installed above and below the tableware storage basket 5 in the washing room 3.
A washing nozzle 11 is disposed for spraying hot water in the washing tank 4, which is force-fed by the washing machine, onto the tableware 10 stored in the storage basket 5.

Reference numeral 12 denotes an overflow pipe installed in the cleaning tank 4, and drains overflowing hot water to an appropriate external location.

13 is a water supply pipe connected to a water source via a water supply valve 14;
A float mechanism 16 including a float switch 15 controls the water supply valve 14 as appropriate to control the supply of water into the booster tank 8 at a predetermined level.

17 is a heater that heats the water supplied into the booster tank 8; 18 is a heater 1 that maintains the water temperature at a predetermined temperature;
This is a control thermostat that controls 7.

Next, the electric circuit of the present invention will be explained.

15 is a power switch 19 and a normally closed third relay contact 24
The float switch of the float mechanism 16 is connected through a, the water supply valve 14 is connected through the low water level contact 15A of the switch 15, and the first relay 20 is connected through the predetermined water level contact 15B.

20a is a self-holding contact of the first relay 20.

Further, a second relay 21 is connected via the power switch 19, the normally open contact 20b of the first relay 20, and the control thermostat 18, and the heater 17 is connected via the normally open contact 21a of the relay 21. Ru.

Further, 22 is an operation switch having an OFF contact 22a, a hot water supply contact 22b, and a cleaning contact 22C.
A parallel circuit of the hot water supply pump 7 and the third relay 24 is connected between the cleaning contact 22C and the normally open contact 233 of the timer switch 23.
Between C and the normally closed contact 23b of the timer switch 23, there is a first interlocking switch 27 that is linked to the operation switch 22 and turns ON for cleaning and OFF for hot water supply, a normally closed fourth relay contact 25a, and the cleaning pump 9. A series circuit of is connected.

Further, 26 is linked to the operation switch 22 and is turned off by cleaning.
A timer that controls switching of the timer switch 23 by supplying electricity through a second interlocking switch 28 that is turned on when hot water is supplied, or a normally open third relay contact 24b, or another normally closed fourth relay contact 25b. It's a motor.

Furthermore, 25 is a fourth relay that is energized via another normally open third relay contact 24C or a normally open fourth relay contact 25C.

Next, the operation will be explained based on the above configuration.

First, when the power switch 19 is turned on, if there is no water in the booster tank 8 yet, the float switch 15 is at the low water level side contact 15A, so the water supply valve 14 is turned on and water supply starts.

When a predetermined water level is reached, the float switch 15 switches to the predetermined water level side contact 15B.

Then, the water supply valve 14 is turned OFF, the first relay 20 is energized and self-holds at its self-holding contact 20a, and at the same time, the first relay contact 20b, which is always open, is closed, so that the second relay is turned off via the control thermostat 18. 21 is energized, its contact 21a is closed, and the heater 17 is energized to heat the water supplied into the booster tank 8.

The temperature of the water in the booster tank 8 is controlled to a constant temperature by a control thermostat 18.

Next, when the operation switch 22 is switched from the OFF contact 22a to the hot water supply contact 22b, the timer motor 26 is energized via the other normally closed fourth relay contact 25b.

At this time, the first interlock switch 27 is open, so the cleaning pump 9 is inactive, and when the time switch 23 switches to the normally open contact 23a after a predetermined period of time, the hot water pump 7 operates and the hot water in the booster tank 8 is turned on. Hot water is supplied into the cleaning tank 4 through the rinsing nozzle 6.

Also, at this time, the third relay 24 is energized and its normally closed contact 2
4 a opens.

Therefore, by supplying hot water, the water level in the booster tank 8 decreases and the float switch 15 switches to the predetermined water level side contact 1.
Even if switching from 5B to low water level side contact 15A, water supply valve 1
4 does not operate and does not supply water during hot water supply.

Also, at this time, the first relay 20 is de-energized and its contact 2
In order to open circuit 0b and de-energize the second relay 21,
The heater 1 was energized via the relay contact 21a.
7 is also not energized.

This means that if you supply water while the hot water pump 7 is operating, the water temperature in the booster tank 8 will drop, and the water level in the booster tank 8 will only decrease when the hot water pump 7 is operating. Therefore, it is advantageous for safety to turn off the heater 17 at this time.

By repeating the above steps, a predetermined amount of hot water is stored in the cleaning tank 4.

When the hot water supply is finished, the operation switch 22 is turned to the hot water supply contact 2.
When the cleaning contact 22B is switched to the cleaning contact 22C, the first interlock switch 27 is closed and the second interlock switch 28 is opened.

Therefore, the washing pump 9 operates, and the hot water supplied into the washing tank 4 is injected from the washing nozzle 11 to the tableware 10.
cleaning is performed.

When cleaning is completed, the timer switch 23 switches to the normally open contact 23.
a, the hot water supply pump 7 and the third rule 24 are operated, and the hot water in the booster tank 8 is injected from the rinsing nozzle 6 to rinse the tableware 10.

Note that rinsing at this time is similar to the hot water supply operation described above, and water is not supplied during rinsing.

Further, water is supplied into the booster tank 8 and water is heated when the timer switch 23 is positioned at the normally closed contact 23b.

As described above, the present invention consists of an electric booster that is supplied with water from the outside via a water supply valve and that is equipped with a heater inside, and a dishwasher main body that washes tableware with hot water supplied from the electric booster. The feature is that the water supply valve is maintained in a closed state and the power to the heater is stopped during the process of supplying hot water into the dishwasher main body, so that hot water can always be supplied at a set temperature. It is an excellent dishwasher in terms of safety, and the heater is also turned off when the water level in the booster tank is decreasing due to hot water supply, making it extremely safe.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an inner view of a dishwasher equipped with an electric booster according to the present invention, and FIG. 2 is an electric circuit diagram of the present invention. 2... Electric booster, 14... Water supply valve, 17... Heater.

Claims (1)

[Scope of utility model registration request] In a dishwasher that is equipped with an electric booster that is supplied with water from the outside via a water supply valve and has a heater installed inside, and that washes dishes with hot water supplied from the electric booster, the hot water from the booster is used in the main body of the dishwasher. A dishwasher characterized in that a relay device is provided for stopping energization to the water supply valve and the heater while hot water is being supplied to a washing tank inside the dishwasher.