JPH0628626B2 - Operation control device for dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention controls a cleaning operation of injecting cleaning water in a cleaning tank from a cleaning nozzle and a rinsing operation of injecting hot water of a booster from a rinsing nozzle with a timer. The present invention relates to a dishwasher that sprays hot water from a booster from a tin nozzle to supply hot water to a cleaning tank, and more particularly to a device that controls operations of cleaning, rinsing, and hot water supply.

(B) Prior Art As for the operation control device for washing, rinsing and hot water supply in the conventional dishwasher of this kind, as disclosed in Japanese Patent Publication No. 54-33669, the operation switch has a cleaning side contact and a hot water supply side contact. First, position the operation switch on the hot water supply side contact to supply the hot water from the water heater to the cleaning tank, and after the hot water supply is completed, switch the operation switch to the cleaning side contact to perform cleaning and rinsing operations in sequence. The disadvantage of switching switches is that the washing pump operates when the operation switch is positioned at the washing side contact even when hot water is not being supplied to the washing tank, causing the pump to run dry and adversely affecting the pump seal and other parts. Was played.

(C) Object of the present invention The present invention addresses the drawbacks of the prior art, eliminates the trouble of switching operation switches, simplifies the operation, and prevents malfunction of the cleaning operation when hot water is not supplied to the cleaning tank. The purpose is to improve operational reliability.

(D) Configuration of the invention The present invention is a manual operation switch, a door switch that is closed when the door is closing the cleaning chamber, a liquid level detection device for detecting the water level of the cleaning tank, and the cleaning tank A cleaning pump that pumps the cleaning water to the cleaning nozzle, a rinse pump that pumps the hot water from the booster to the rinse nozzle, and a timer that is energized based on the closing of the operation switch and door switch to control the operating time of the cleaning and rinse pump Device,
A cleaning control relay device that is excited by the cleaning time based on the timer device to operate the cleaning pump, a rinsing control relay device that is excited by the rinsing time based on the timer device to operate the rinse pump, and the liquid level detection device. Is an operation control device for a dishwasher, which is provided with a relay device for holding the cleaning control relay device in a non-excited state and controlling the operation of the cleaning pump in a stopped state when the predetermined water level is not detected.

(E) Example FIG. 1 is a vertical cross-sectional view showing the internal structure of a dishwasher embodying the present invention, in which a door body (2) which can be raised and lowered is provided above a main body (1) having an open top surface. A cleaning chamber (3) whose front surface is open is defined and formed, and a cleaning nozzle (4A) is provided above and below the cleaning chamber (3).
And (4B) and rinsing nozzles (5A) and (5B) are rotatably arranged, and a rack (7) accommodating the object to be cleaned (6) between them.
Are mounted on the support rail (8). Also a washing room (3)
A cleaning tank (11) having an upper surface covered with a removable filter (9) and having an overflow pipe (10) communicating with the outside is formed in the lower lower part of the main body.

Thus, a cleaning pump (12) is installed between the cleaning nozzles (4A) and (4B) and the cleaning tank (11), and the rinse nozzles (5A) and (5B) and the main body (1) are installed side by side. By installing the rinse pump (14) between the boosters (13)
2) is for cleaning water in the cleaning tank (11) with the cleaning nozzles (4A) and (4
The rinsing pump (14) is configured to pump the hot water stored in the booster (13) to the rinsing nozzles (5A) and (5B). Further, the cleaning tank (11) is provided with a pressure detecting type liquid level detecting device (15).

Next, the electric circuit of the present invention will be described with reference to FIG. (1
6) is a manual operation switch that repeats ON / OFF each time it is pressed, (17) is a door switch that closes the contact when the door (2) closes the cleaning chamber (3), (18) Is the lower contact (18
A) and the pressure switch of the liquid level detection device (15) having the upper contact (18B), (19) is a timer for controlling the cleaning operation time and the rinse operation time, 90 seconds is one cycle, 75 seconds cleaning It has a rinsing contact (19A) and a rinsing contact (19B) which switch the contacts with time and a rinsing time of 15 seconds. (2
0) is the first relay for controlling the cleaning pump (12) connected to the cleaning contact (19A) side of the timer (19), and is the normally open first relay contact (20A) connected in series with the cleaning pump (12). ) Has.
(21) is a second relay for controlling the rinsing pump (14) connected to the rinsing contact (19B) side of the timer (19), and is a normally open second relay contact ((2) connected in series with the rinsing pump (14). In addition to 21A), it has two normally open second relay contacts (21B) and (21C). (22) is the upper contact (18B) of the pressure switch (18)
The third relay connected to the side has a normally open third relay contact (22A) connected in series with the first relay (20), and the liquid level detection device (15) detects a predetermined upper level. If not, the first relay (20) is kept non-excited and the operation of the cleaning pump (12) is controlled to a stopped state. (23) is a fourth relay, which has a normally open fourth relay contact (23A) and a normally closed fourth relay contacts (23B) and (23C).

Next, the hot water supply, cleaning and rinsing operations of the present invention will be described. When the door body (2) is closed, the door switch (17) is closed, and the operation switch (16) is turned on, the timer (19)
However, since the cleaning tank (11) is empty, the pressure switch (18) is located at the lower contact (18A), and the third relay (22) is not energized and is normally open. contact
(22A) is open circuit. Therefore, since the first relay (20) is not excited and the normally open first relay contact (20A) is opened, the cleaning pump (12) does not operate. Therefore, the cleaning time is 7
After 5 seconds, the contact of the timer (19) will be
9B) to excite the second relay (21) to close the normally open second relay contact (21A) to operate the rinse pump (14) and also to the normally open second relay contact (21B) and ( 21C)
To close the normally open fourth relay contact (23A) to energize the fourth relay (23) and close the normally closed fourth relay contact (23B).
And (23C) are opened to form a self-holding circuit for the fourth relay (23). As a result, the rinse pump (14) pumps the hot water of the booster (13) to the rinse nozzles (5A) and (5B),
Hot water sprayed from the nozzles (5A) and (5B) falls into the washing tank (11) and is supplied with hot water.

As described above, when the cleaning tank (11) is empty, the cleaning pump (12) does not operate for 75 seconds corresponding to the cleaning time, and the rinsing pump (14) operates for 15 seconds corresponding to the rinsing time. Fill the wash tank (11) with hot water from the pusher (13). This hot water supply operation is performed until the water level in the cleaning tank (11) reaches a predetermined water level, and when the liquid level detection device (15) detects a predetermined upper level, the pressure switch (18) switches the lower contact (18A) to the upper contact. Switch to (18B). This allows the third relay
(22) is excited and the normally open third relay contact (22A) is closed. On the other hand, the timer (1
When the contact of 9) is switched to the cleaning contact (19A), the second relay (2
When the excitation of 1) is released, the normally open second relay contact (21A) is opened, the rinse pump (14) is stopped, hot water supply is terminated, and the normally open second relay contact (21B) is opened.
Power to (19) is cut off. Even if the contact of the timer (19) is switched to the cleaning contact (19A), the normally closed fourth relay contact (23C) is open because the fourth relay (23) is held by itself. The 1 relay (20) is not excited, and the washing pump (12) is not continuously operated after the hot water supply is completed.

After the hot water is supplied, open the door body (2) to open the door switch (1
When 7) is opened, the self-holding of the fourth relay (23) is released and the normally open fourth relay contact (23A) is opened and the normally closed fourth relay contacts (23B) and (23C) are opened. Make a circuit. Then, a rack (7) accommodating the object to be cleaned (6) is installed in the cleaning chamber (3), and at the same time, the detergent is put into the cleaning tank (11), and then the door body (2) is closed again. And the door switch (17) are closed, the third relay (22) is excited and the normally open third relay contact (2
2A) is closed, and the contact of the timer (19) is the cleaning contact at this time.
Since it is located at (19A), the first relay (20) is excited and the normally open first relay contact (20A) is closed. As a result, the cleaning pump (12) is operated to pump the cleaning water in the cleaning tank (11) to the cleaning nozzles (4A) and (4B), and the nozzle (4A)
And the cleaning operation is started by spraying the cleaning water from (4B) to the object to be cleaned (6).

Then, when the cleaning time of 75 seconds has passed, the timer (19)
Since the contact of is switched to the rinse contact (19B), the first relay (2
(0) is de-energized, the normally open first relay contact (20A) is opened, the washing pump (12) is stopped, the washing operation is completed, and the second relay (21) is excited and the normally open first 2 relay contacts
(21A), (21B) and (21C) are closed. As a result, the fourth relay (23) is excited to close the normally open fourth relay contact (23A) and to close the normally closed fourth relay contacts (23B) and (23C).
Is opened and the fourth relay (23) forms a self-holding circuit,
At the same time, the rinsing pump (14) is operated to pump hot water from the pusher (13) to the rinsing nozzles (5A) and (5B), and the nozzle (5A)
Also, rinsing operation is started by injecting rinsing water of hot water from (5B) to the article to be cleaned (6).

When the rinsing time of 15 seconds elapses, the timer (1
Since the contact of 9) is switched to the cleaning contact (19A) again, the excitation of the second relay (21) is released and the normally open second relay contact (21A) is opened to stop the rinse pump (14) and rinse operation. To finish. Further, the opening of the normally open second relay contact (21B) cuts off the power supply to the timer (19). The timer (19)
The 4th relay (23) even if the contact of is switched to the cleaning contact (19A)
Is normally held because it is self-holding.
Since C) is open and the first relay (20) is not excited, the cleaning pump (12) is not continuously operated and the cleaning and rinsing operation is stopped in one cycle.

In the present invention, the cleaning time by the timer (19) is 75 seconds,
Although the rinsing time is set to 15 seconds, it can be freely set according to the ability of the washing machine, or may be designed to control the washing and rinsing time by an IC timer.

(F) Effect of the Invention The present invention eliminates the hassle of switching the operation switch at each transition from the hot water supply operation to the cleaning operation, simplifies the operation, and closes the operation switch when there is no cleaning water in the cleaning tank. Also, there is an advantage that the malfunction of the cleaning operation is eliminated and the operational reliability is improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the internal structure of a dishwasher equipped with the device of the present invention, and FIG. 2 is an electric circuit diagram of the present invention. (12) …… wash pump, (14) …… rinse pump, ( 15 ) ……
Liquid level detector, (16) …… Operation switch, (17) …… Door switch, ( 18 ) …… Pressure switch, (18A) …… Lower contact, (18B) …… Upper contact, ( 19 ) …… Timer, (19A)
…… Wash contact, (19B) …… Rinse contact, ( 20 ) …… First relay, (20A) …… Normally open first relay contact, ( 21 ) …… Second
Relay, (21A) ... Normally open second relay contact, ( 22 ) ... Third relay, (22A) ... Normally open third relay contact.

Claims (1)

[Claims] 1. A cleaning operation of injecting cleaning water of a cleaning tank from a cleaning nozzle and a rinsing operation of injecting hot water of a booster from a rinsing nozzle are controlled by a timer, and hot water of a booster is injected from a rinsing nozzle to a cleaning tank. In the dishwasher that supplies hot water, a manual operation switch, a door switch that is closed when the door body closes the cleaning chamber, a liquid level detection device that detects the water level of the cleaning tank, and the cleaning A cleaning pump that pumps the tank cleaning water to the cleaning nozzle, a rinse pump that pumps the hot water of the booster to the rinse nozzle, and the operating switch and the door switch are energized to turn on the operating time of the cleaning and rinse pump. And a cleaning device for controlling the cleaning pump which is excited by the cleaning time based on the timer device to operate the cleaning pump. A control relay device, a rinse control relay device that is excited at a rinse time based on the timer device to operate the rinse pump, and the cleaning control relay device when the liquid level detection device does not detect a predetermined water level. An operation control device for a dishwasher, characterized in that a relay device is provided for controlling the operation of the washing pump to be in a stopped state by keeping the non-excitation state.