JPH0112697Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention is a water supply device for rationally supplying rinsing water to a hot water storage tank in a dishwasher that washes dishes by sequentially performing a washing operation in which a cleaning liquid is injected and a rinsing operation in which rinsing water is injected. Regarding.

[Prior art]

It has a cleaning liquid tank and a hot water storage tank, and in the cleaning process, the cleaning liquid in the cleaning liquid tank is sprayed onto dishes placed above the tank and collected in the cleaning liquid tank, and in the next rinsing process, the rinsing water in the hot water storage tank is Most dishwashers that spray water onto the dishes and collect it in the cleaning liquid tank store a fixed amount of rinsing water in the hot water storage tank in preparation for rinsing operation, but if the water is stored too early, the heat dissipates. The problem is that the temperature of the hot water decreases, requiring a heating device and requiring an insulating structure for the tank, leading to higher costs. On the other hand, in order to reduce heat dissipation loss, it is natural that the hot water supply to the hot water storage tank should end at the time of switching to rinsing operation, so such a hot water supply method may be used. In this case, if the timing is incorrect, the rinsing operation will begin before a sufficient amount of hot water is obtained, causing problems with the cleaning effect. It is also difficult to implement such control, and it is virtually impossible to realize such control, and even if it were possible, the problem would be that the device would be complicated.

[Purpose of invention]

The present invention was devised in response to the problems that conventional washing machines of this type had in terms of hot water supply, as mentioned above, and was designed to rationalize the timing of hot water supply for rinsing. Therefore, an object of the present invention is to reduce heat radiation loss and simplify the structure of the device, thereby making it suitable as a practical device.

[Structure of the idea]

Therefore, the present invention is a water supply device for this type of washing machine having the form described above, which detects the water level in the hot water storage tank and issues a full water level signal when the water level reaches a predetermined water level, and a low water level signal when the water level has not reached the predetermined water level. The vessel and
It consists of an initial hot water supply switch, an operation switch, a hot water pipe with a hot water supply port facing the hot water storage tank, a solenoid valve installed in the hot water pipe, and a control circuit for opening and closing the solenoid valve. be. Furthermore, the present invention operates the control circuit in a state where the water level detector is emitting a low water level signal, and the switch is operated by the initial hot water supply switch, or the switch is operated by the operation switch and the cleaning operation is in progress. Depending on the situation, an opening output is issued to the solenoid valve, and a closing output is issued to the solenoid valve depending on whether the water level detector is issuing a full water level signal or whether the switch is operated by the operation switch and is in the rinsing operation. It is formed in the circuit that emits the signal. With this configuration, the initial hot water supply for the first cleaning of the day can be performed at any time by operating a switch, and for the second and subsequent cleanings, the next cycle of cleaning operation starts at the same time. Also, without prematurely supplying hot water to the hot water tank,
A predetermined amount of rinsing hot water can be stored without too much delay, and even if a water level detector installed in the hot water storage tank detects a low water level during rinsing operation, it is possible to prevent hot water from being supplied. can achieve the intended purpose.

【Example】

An embodiment of the present invention will be described in detail below based on the drawings. In FIG. 1, 1 is a casing of the main body of the washing machine, and inside thereof, a tableware storage section 2 and a washing liquid tank 3 are arranged vertically, and a hot water storage tank 7 is arranged on the side of the washing liquid tank 3. It is stored. The tableware storage section 2 has a space in which a wire-mesh-like rack 15 for storing tableware can be horizontally fixed or rotatably accommodated around its central vertical axis, and the rack 15 is provided above and below the space. Cleaning/rinsing nozzle that can spray liquid toward

[Hereinafter abbreviated as nozzle] 4 is installed horizontally. In addition, in the case of a system in which the rack is rotated, a nozzle is additionally provided that sprays water in the horizontal direction and rotates the rack using water jet pressure. On the other hand, the cleaning liquid tank 3 has the shape of a flat, deep dish with an open top, and is installed horizontally directly below the tableware storage section 2 so as to receive the entire amount of liquid sprayed toward the rack 15. 6 at a predetermined level is provided, and is formed to store a predetermined amount of cleaning liquid and drain any excess water from the overflow port 6. Next, the hot water storage tank 7 is located at a position where falling water from the tableware storage section 2 will not enter, by making the side wall higher or by interposing a shield plate between it and the tableware storage section 2. It is placed on the side. The cleaning liquid tank 3 and the hot water storage tank 7 are provided with an outlet at the bottom, and each outlet is provided with a solenoid valve 10 and 11, and each outlet is connected to the suction part of the circulation pump 5. A cleaning liquid suction line 8 connecting the outlet of the tank 3 and the suction section
A rinsing water suction line 9 is formed which connects the outlet of the hot water storage tank 7 and the suction section. The above circulation pump

[Hereafter abbreviated as pump]5
The discharge portion thereof is connected to the inlet portions of the nozzles 4, 4 through piping. Reference numeral 12 denotes a hot water supply port formed at the end of the hot water supply pipe, which faces above the hot water storage tank 7 to supply rinsing hot water to the tank 7. A solenoid valve 14 is interposed in the middle of the hot water supply pipe, and the hot water storage tank 7 is located at a position where the water level can be filled to a level slightly lower than the level of the overflow port 6. At the same time, a water level detector 13 is attached inside the tank. The water level detector 13 detects the water level in the hot water storage tank 7 and issues a full water level signal when the water level reaches a predetermined level, and operates to open an output contact, for example,
On the other hand, at a low water level that has not yet reached the full water level, a low water level signal is generated, for example, an output contact is closed, and the solenoid valve 14 is controlled to open and close, thereby allowing automatic water supply. In this case, the full water level is several times higher than the level of the overflow port 6 in order to absorb variations in the operating value of the detector 13 and enable reliable control of the solenoid valve 14.
It is important to set the level to a level as low as 1 mm, thereby eliminating troubles during detection. The electric control circuit for the washing machine with the above structure is shown in Fig. 2, and the sequence of operation by this circuit is shown in Fig. 3.
is the motor for the pump 5, and the relay 20 for cleaning operation.
It is driven when either one of the rinse operation relays 23 is energized. 14s is a solenoid for the electromagnetic valve 14, which is energized and opened when either the initial hot water supply relay 18 or the automatic hot water supply relay 21 is energized, thereby opening the hot water supply pipe having the hot water supply port 12. 10S is a solenoid of the electromagnetic valve 10, which is energized and opened when either the initial hot water supply relay 18 or the cleaning operation relay 20 is energized, thereby opening the cleaning liquid suction line 8. 11S is a solenoid for the electromagnetic valve 11, which is energized and opened when either the initial hot water supply relay 18 or the rinse operation relay 23 is energized, thereby opening the rinse water suction line 9. The initial hot water supply relay 18 operates when the liquid level detector 13 is inactive when the selection switch 24, which has three notches: operation switch, stop switch, and initial hot water supply switch, is operated to the initial hot water supply switch.

It is energized while [the water level of the hot water storage tank 7 has not reached the full water level]. Reference numeral 19 denotes an operation holding relay which is energized from when the push button 25 is pressed with the selection switch 24 set to the operation switch until the stop relay 22 is energized, that is, a series of cleaning and rinsing processes are performed. It is something. Reference numeral 16 denotes a timer for cleaning operation, which is an on-delay/off-reset type timer that is energized in synchronization with the operation holding relay, switches the output contact 16C when the set time required for the cleaning operation has elapsed, and maintains this until de-energized. . Reference numeral 17 denotes a rinse operation timer, which is energized when the output contact 16C of the timer 16 switches after a predetermined period of time has elapsed, and is kept energized until the operation holding relay 19 is deenergized. When the set time has passed, the output contact 17C is switched and held until de-energized.
This is an off-reset type timer. The cleaning operation relay 20 is connected to the timer 16.
The output contact 16C is energized until a predetermined time elapses after the output contact 16C is switched. The automatic hot water supply relay 21 is the washing operation relay 20
It is energized during the cleaning operation when the liquid level detector 13 is energized and while the liquid level detector 13 is inactive. The stop relay 22 closes the output contact 17 after a predetermined time elapses after the rinse operation timer 17 is activated.
When C is switched, it is energized and the energization is maintained only for a short time until the operation holding relay 19 is deenergized. The rinsing operation relay 23 is energized until a predetermined time has elapsed after the rinsing operation timer 17 is energized and the output contact 17C is switched. It is clear from the above explanation of the operation of each device, as shown in the diagram in FIG. 3, by operating the selection switch 24 to the initial hot water supply switch, The valve 14, the solenoid valve 10 of the cleaning liquid tank 3, and the solenoid valve 11 of the hot water storage tank 7 are all opened, and hot water is simultaneously supplied to both the tanks 3 and 7, which are connected by the suction lines 8 and 9, and the hot water storage tank When the liquid level at No. 7 reaches the full water level, the three solenoid valves 14, 3, and 10 close, and hot water supply ends. At that time, the hot water storage tank 7 becomes full of water just before it overflows from the overflow port 6, and the water level detector 13 detects the full water level and closes the solenoid valve 14, so that a predetermined amount of liquid is supplied into the cleaning liquid tank 3. possible at the same time. In addition, since the level with a predetermined difference from the overflow port 6 is set as the full water level detection level, it is possible to eliminate malfunctions such as failure to detect. When this hot water supply is completed, operate the selection switch 24 to the operation switch and press the push button switch 25. During the time set by the washing operation timer 16,
The solenoid valve 10 opens, the pump 5 is driven, and the cleaning operation begins. When the timer 16 reaches the set time and switches the output contact 16C, the solenoid valve 10 closes.
1 opens, it switches to rinsing operation, and after continuing this for the time set by the rinsing operation timer 17,
By the operation of the stop relay 22, the pump 5 is stopped, the solenoid valve 11 is closed, and one cleaning cycle is completed. In this case, during the rinsing operation, the hot water in the hot water storage tank 7 is used and the hot water after rinsing is collected in the cleaning liquid tank 3, so the amount of water in the cleaning liquid tank 3 is maintained at a predetermined value. When the water level falls, the water level detector 13 emits a low water level signal.

[Contact 13
Close b ₁ and 13b ₂ . However, since the output contact 16C of the cleaning operation timer 16 has been switched from the state shown in the second figure, the automatic hot water supply relay 21 remains de-energized.
Therefore, the solenoid valve 14 remains closed and does not open. In addition, since the stop relay 22 is energized for a short time upon completion of one cycle, the operation holding relay 1
9 is deenergized and the self-holding contact _19a1 is opened, so that the solenoid valve 14 is not energized. Therefore, hot water is not supplied to the hot water storage tank 7 during the first cycle of washing and rinsing and after the completion of washing. Next, the second and subsequent cleaning cycles are started each time the push button switch 25 is pressed. At this time, the water level detector 13 is emitting a low water level signal, so the automatic hot water supply relay 21 is energized and the solenoid valve 14 is activated. As a result of opening the valve, hot water is supplied. After reaching the full water level, the same operation as in the first cleaning cycle is performed. The above operation is as shown in the time chart of FIG. Incidentally, instead of the rotary type selection switch 24, a switch mechanism may be used in which switches A to C are individually provided and an interlock mechanism is provided between them.

[Effect of the idea]

As explained above, in the present invention, rinsing water is supplied to the hot water storage tank 7 when the next cleaning cycle is started, so the interval between uses of the washer is extended. Even if hot water is heated up, there is no longer any inconvenience caused by supplying hot water too quickly, and it is possible to minimize heat loss and prevent the temperature from dropping. It is possible to eliminate the causes of high costs such as

[Brief explanation of the drawing]

FIG. 1 is a schematic mechanical diagram of an example of the present invention, FIG. 2 is an electric control circuit diagram, and FIG. 3 is a time chart showing the operational relationship of control equipment in the circuit shown in FIG. 3...Cleaning liquid tank, 7...Hot water storage tank, 12
... Hot water inlet, 13 ... Water level detector, 14 ... Solenoid valve, 24 ... Selection switch.

Claims (1)

[Scope of utility model registration request] It has a cleaning liquid tank 3 and a hot water storage tank 7, and in the cleaning process, the cleaning liquid in the cleaning liquid tank 3 is sprayed onto the dishes placed above the tank 3 and collected in the cleaning liquid tank 3, and in the next rinsing process, the cleaning liquid in the hot water storage tank 7 is sprayed onto the dishes placed above the tank 3. In a dishwasher that sprays rinsing water onto the dishes and collects it in a cleaning liquid tank 3, there is a hot water supply pipe provided with a hot water supply port 12 facing the hot water storage tank 7, and an electromagnetic pipe interposed in this hot water supply pipe. Valve 14 and hot water storage tank 7
a water level detector 13 that detects the water level in the water and issues a full water level signal at a predetermined water level and a low water level signal when the water level has not reached the predetermined water level, an initial hot water supply switch that is operated when hot water is first supplied, and a cleaning operation It consists of an operation switch that is operated at the time of operation, and a control circuit that opens and closes the solenoid valve 14, and the control circuit is in a state where the water level detector 13 is emitting a low water level signal,
Depending on whether the initial hot water supply switch is operated or the operation switch is operated and the cleaning operation is in progress, an open output is issued to the solenoid valve 14, and whether the water level detector 13 is issuing a full water level signal or not, the operating switch is operated. A hot water supply device characterized in that the circuit is formed to issue a closing output to a solenoid valve 14 depending on whether a switch is operated and a rinsing operation is in progress.