JPH0625260Y2 - Control circuit for dishwasher and water heater - Google Patents

Description

[Detailed Description of the Invention] a. Industrial field of application The present invention relates to a dishwasher, and in particular, dishware that automatically supplies hot water from a water heater to a wash water tank by operating a rinsing hot water pump during hot water supply. The present invention relates to a control circuit for a washing machine and a water heater.

b. Conventional technology In the past, hot water was supplied to the dishwasher all at once by continuously operating the rinsing hot water pump until the water level detection switch in the wash water tank detected a shortage It was common practice. Therefore, only the water level detection switch in the wash water tank controls the rinsing hot water pump during automatic hot water supply. In addition to such a hot water supply method, there is also a method of split hot water supply using a timer time for cleaning and rinsing. A typical example thereof is disclosed in JP-A-54-33669.

c. Problems to be solved by the invention In the former automatic hot water supply method, the washing water tank is in an empty state as a preparation before the start of washing work or when a large amount of washing is performed and the dirty washing water is totally replaced. Since the hot water is supplied all at once until the predetermined water level is reached, it is necessary to make the tank water amount of the water heater approximately equal to the predetermined water amount of the washing water tank of the dishwasher. This hinders the downsizing of the water heater and hence the dishwasher, making it difficult to secure an installation space and increasing the cost.

On the other hand, the latter method of dividing hot water supply by using the washing process and the rinsing process of the timer-controlled washing cycle can realize the above-mentioned compactification because of the divided hot water supply, but generally, the washing process time and the rinsing process time are Since the user can change the type and the degree of dirt, the washing process is used to heat the water in the hot water supply device during the washing cycle time (hence, the hot water supply is stopped during this period). If the rinsing process is used as it is for hot water supply from the hot water supply device to the cleaning tank, for example, if the user sets the cleaning process time to be long, the hot water supply pause time will inevitably become long, so that The time until the hot water supply is completed becomes longer by the time of the hot water supply pause in one cleaning process multiplied by the number of times of divided hot water supply, and conversely, the cleaning process time is set shorter. When hot water supply pause time is reduced, without a certain time until the hot water supply is completed, there is a concern that impair the operation reliability of the operator with respect to the dishwasher.

Therefore, an object of the present invention is to provide a control circuit for a dishwasher and a water heater, which makes it possible to downsize the water heater and thus the dishwasher while keeping the hot water supply completion time constant.

d. Means for Solving Problems In order to solve the problems of the prior art as described above, the present invention operates a rinsing hot water pump to supply hot water from a water heater to a dishwasher. In the control circuit of the dishwasher and the water heater that automatically supply the hot water tank, the hot water tank is equipped with a water level detection switch to detect the predetermined water level of the hot water tank, and the water heater has a high water level. Provided with a detection switch and a low water level detection switch, when hot water is supplied from the water heater to the wash water tank, if the water level in the wash water tank does not reach the prescribed level, the water is detected via the water level detection switch in the wash water tank. When the high water level detection switch of the water heater operates, the rinsing hot water pump is energized, and when the low water level detection switch in the water heater operates, the hot water supply circuit is configured to turn off the rinsing hot water pump. Within the prescribed Position is characterized in that it has configured to operate until switched water level detecting switch in the washing water tank is filled.

e. Operation According to the above configuration, hot water is not supplied all at once, and when the water level of the water heater reaches a high water level, hot water supply is started, and when the water level becomes low, hot water supply is stopped and the high water level is set again. When the water temperature becomes low, the rinsing hot water pump is controlled so as to perform the water level detection divided quantitative hot water supply in which the hot water supply is repeated.

f. Embodiment An embodiment of the present invention will be described with reference to the drawings. In order to facilitate understanding of the present invention, first, the structures of the dishwasher 1 and the water heater 13 controlled by the control circuit according to the present invention will be described with reference to FIG.

In the dishwasher 1, a washing chamber 2 having an appropriate volume is formed,
A large number of dishes 11 are juxtaposed on a rack 12 provided at the substantially central portion of the washing room 2. Further, at the top and bottom of the cleaning chamber 2, a rinsing nozzle 4 facing the rack 12 is provided.
A cleaning nozzle 3 is provided as shown in the drawing, and when hot water is sprayed from these nozzles 3 and 4, these nozzles rotate. At the bottom of the dishwasher 1, there is provided a wash water tank 9 which communicates with the wash chamber 2 through a filter 8. The wash water tank 9 has an overflow pipe 10 for flowing excess wash water.
And a water level detection switch 38 for detecting the water level. The wash water tank 9 is connected to the wash nozzle 3 through an intake filter 7, a wash water pump 17, and a wash water pipe 5 provided near the bottom of the tank. On the other hand, the rinse nozzle 4 is connected to a water heater 13 described later through a rinse water pipe 6 and a rinse water pump 18.

The water heater 13 is provided with a high water level detection switch 48 and a low water level detection switch 49 for detecting the water level, the water level is kept constant by the ball tap 14, and an appropriate heater (second B
The water in the water heater 13 is heated by the reference numeral "53" in the figure).

In the cleaning operation, the wash water in the wash water tank 9 is pressure-fed to the wash nozzle 3 through the wash water pipe 5 by the wash water pump 17 through the suction filter 7. For this reason, the pressurized wash water is jetted from the rotating washing nozzle 3 as a jet jet, and the jet collides with the dirt on the rack 12, so that the dirt is removed from the dishes 11 and flows to the lower part of the washing chamber 2 together with the washing water. It falls and is collected by the filter 8. The washing water from which the dirt has been removed in this way is collected in the tank 9 and circulated through the passage again to be reused for washing the dishes 11.

In the rinsing operation, the hot water in the water heater 13 is pumped to the rinsing nozzle 4 by the rinsing hot water pump 18 through the rinsing hot water pipe 6. The pressurized rinse water is jetted from the rotating nozzle 4 to rinse the dishes. The rinsed hot water is
It is collected in the lower wash water tank 9. The excess hot water in the tank 9 is drained from the overflow pipe 10.

Next, a control circuit according to the present invention will be described with reference to FIGS. 2A and 2B.

As shown in FIG. 2A, in the control circuit of the dishwasher 1,
Lines 100 and 101 are connected to an appropriate power line via an earth leakage breaker 15. Between these lines 100 and 101, the heat retention heater 16, the normally open contact 21a ₁ of the relay 21, and the relay
The 29 normally closed contacts 29b ₁ are connected in series, the hot water pump 17 and the normally open contact 29a ₁ of the relay 29 are connected in series, and the rinse water pump 18 and the normally open contact 40a _{1 of the} relay 40 are connected in series. ing.

Line 100 is the normally open contact 51a of the power switch 19 and relay 51.
Connected to line 102 through ₁ and also contact of switch 38
It is connected to line 105 through 38b and to line 103 through contact 38a. The switch 38 is a water level detection switch provided in the wash water tank 9, and is connected to the contact 38a side when the water level is above a predetermined level in the tank 9, and is connected to the contact 38b side when the water level is below the predetermined level. .

On the other hand, the line 101 is connected to the line 104 via the door switch 23, and the line 104 is further connected to the contact 41b of the rinse timer 41.
It is connected to the line 107 via ₂ .

The power lamp 20 is connected between the connection point of the power switch 19 and the contact 51a ₁ and the line 101.

A relay 21 and a thermostat 22 are connected in series between lines 103 and 104, and a washable lamp 24 is connected between these lines.

The normally closed contact 28b ₁ of the relay 28, the relay 25, and its normally open contact 25a ₂ are connected in series between the lines 103 and 107.
A normally closed contact 27a is connected between the connection point of 25 and the contact 25a ₂ and the line 107. Furthermore, between lines 103 and 107, normally closed contact 25b ₁ of relay 25, relay 28, start switch
26 and the normally closed contact 27b are connected in series. The contacts 27a and 27b are interlocked with each other, and when one contact is closed, the other contact is opened. A relay 29 and a contact 37b ₁ of a cleaning timer 37 connected in series are connected to both ends of the relay 28 in parallel with the relay 28, and a contact 28a ₃ is provided between the connection point of the relay 28 and the switch 26 and the line 107. Are connected. Further, between the line 103 and the line 107, the contact 28a ₂ , the diode 31, and the operation lamp 30 are connected in series, and the cleaning timer
37 is connected, the contact 37a ₁ and the rest timer 39 are connected in series, and further the contact 39a ₁ , contact 50b ₁ and the relay 40 are connected in series. As shown, the contacts 37b ₁ and 37a ₁ are interlocked and operate complementarily. Resistors 34, 35, 36 connected in series are connected to the timer 37, and the resistance can be switched by the changeover switch 33 to adjust the timer time.

A contact 50a ₁ is connected between the connection point of the contact 50b ₁ and the relay 40 and the line 105, and a diode is further provided between the connection point of the contact 50b ₁ and the relay 40 and the connection point of the diode 31 and the lamp 30. 32 is connected.

Contact 25a ₁ between lines 103 and 107 and rinse timer 41
And a contact 41b ₁ are connected in series, and a resistor 42, a capacitor 43, a diode connected in series are connected to both ends of the timer 41.
44 and the contact 41a ₁ are connected, and the diode 45 is connected between the connection point of the capacitor 43 and the diode 44 and the line 107. Contact 41a operates complementarily to contacts 41b ₁ and 41b ₂ .

A relay 46 is connected between the line 105 and the line 104. This relay 46 is a relay that opens the contact 46a ₁ by energization and starts the operation of the automatic hot water supply control circuit of the water heater 13.

Referring now to FIG. 2B, this figure shows the control circuit for a water heater. In this figure, line 110 and line 111 are connected to a suitable power supply via an earth leakage breaker 47. The line 110 is connected to the line 112 via the low water level detection switch 49. A contact 46a ₁ , a relay 50 and a high water level detection switch 48 are connected in series between the lines 112 and 111, and a contact 50a ₂ is connected in parallel to the switch 48. Further, a relay 51 is connected between the lines 112 and 111, and a thermostat 52 and a heater 53 are connected in series. The high water level detection switch 48 is a switch that energizes the relay 50 to self-hold the relay 50 through the contact 50a ₂ when the water level of the water heater 13 becomes high, and the low water level detection switch 49 is the water heater 13 of the water heater 13. When the water level becomes low, the relay 51 is turned off, and the contact 51a ₁ is opened to turn off all the control circuits of the dishwasher 1 and the water heater. The relay 50 is turned on. The contact 50a ₁ is closed and the contact 50b ₁ is opened to energize the relay 40 and the operation lamp 30.

Next, the operation of the automatic hot water supply control circuit will be described.
Since the water supply is controlled by the ball tap 14, when the water level drops, the water is supplied to reach a predetermined water level.

2A, 2B, and 3, when the water heater 13 is filled with water, the high water level detection switch 48 and the low water level detection switch 49 are shown.
Is on, and when the earth leakage breaker 47 is turned on, the heater 53 and the relay 51 are energized and the contact 51a ₁ is closed. Further, if the earth leakage breaker 15 and the power switch 19 of the dishwasher 1 are turned on and the door switch 23 is turned on, the earth leakage breaker is turned off from the power source.
Since there is no water level through 15 and the power switch 19 and contact 51a ₁ , pass through the water level detection switch 38b side in the hot water tank and relay 4
6, the contact 46a ₁ is closed, the relay 50 self-holds, the contact 50a ₁ is closed, and the relay 40 and the operation lamp 30 are energized. Therefore, the hot water of the water heater 13 is supplied to the dishwasher 1 by starting the operation of the rinse water pump 18. Hereinafter, this is referred to as hot water supply operation.

The high water level detection switch 48 is immediately turned off, but the relay 50 continues to hold itself, so the relay 40 remains energized and the rinse water pump 18 continues to operate. Next, low water level detection switch
When 49 is turned off, the relay 51 is de-energized, all the control circuits are de-energized, and the rinse water pump 18 is stopped. However, since the water heater 13 is under water supply control by the ball tap 14, the low water level detection switch 49 is immediately turned on, and the relay 51, the heater 53, and the relay 46 are energized, but the high water level detection switch 48 does not operate for a while. From water heater 13
When the water level becomes high, the relay is turned on and the relay 50 again holds itself and the rinsing hot water pump 18 operates in the same manner as described above to start the hot water supply operation. By repeating the hot water supply operation in this manner, the water level in the wash water tank 9 eventually reaches a predetermined water level, and when the water level detection switch 38 in the wash water tank is switched to the contact 38a side, hot water supply is completed.

The relay 21 and the washable lamp 24 are energized by switching the water level detection switch in the wash water tank to the contact 38a side. Since the relay 21 is energized through the thermostat 22, the hot water in the hot water tank 9 is kept warm by energizing the heater 16 through the contact 21a ₁ .

The washing water tank 9 is filled with an appropriate amount of detergent, the rack 12 on which the dishes 11 are arranged is placed in the washing chamber 2, and the door is closed.

Here, in order to clarify the explanation, the changeover switch 33 for time adjustment and the cleaning timer 37 combined with the semi-fixed resistance 34, the resistance 35, and the resistance 36 are set to the delay time t _37A , and the pause timer 39 is set to the delay time t _39A. And a resistor to delay the return
The rinsing timer 41 combined with 42, the capacitor 43, the discharging diode 44, the charging diode 45, the contact 41a ₁ and the contact 41b ₁ has a delay time t _41A and a recovery time t _41B .

In Fig. 2A and Fig. 4, when the start switch 26 is pressed, the operation of the cleaning cycle is such that the relay 29 is energized, the relay 28 holds itself through the contact 28a ₃ , and the cleaning timer 37 and the operation lamp through the contact 28a _2. 30 is energized. Therefore, when the contact 29a ₁ is closed, the wash water pump 17 is operated to perform washing. contacts 37b ₁ is opened in operation of the washing timer 37 after t _37A, washed water pump 17 for the energization of the relay 29 is broken will stop, since the contact point 37a ₁ is closed, is energized in a rest timer 39. Contact 39a _{1 by} the operation of the pause timer 39 after time t _{39A 1}
Is closed, the relay 40 and the rinse timer 41 are energized, and the contact 40a ₁ is closed to operate the rinse water pump 18 for rinsing. Since the contact 41b ₂ is opened by operation of the rinse timer 41 after t _41A relay 28, the washing timer 37, Inactivity Timer
39, the rinse timer 41, the relay 40, and the operation lamp 30 are de-energized, and the rinse water pump 18 is stopped. After t _41B , the rinsing timer 41 returns and the cleaning cycle is completed.

Incidentally, the contacts 28a ₁ to serve as a retention for advancing regardless wash cycle the water level after the cleaning start.

Next, in the case of rinsing only in FIGS. 2A and 5, when the rinsing switch 27a is pressed, the relay 25 holds itself through the contact 25a ₂ and closes the contact 25a ₁ , thereby causing the relay 40, the rinsing timer 41, and the operation. Rinse hot water pump energized by lamp 30
18 is driving and rinsing. The rest is the same as the rinse of the cleaning cycle.

g. Effect of the Invention According to the present invention, since the divided hot water is supplied, the tank capacity of the water heater can be reduced, which allows the overall size of the water heater to be reduced in size and weight, which leads to cost reduction and cost reduction. The installation space can be reduced, the heat dissipation area can be reduced and the heat insulation efficiency can be improved by downsizing the water heater, so that the energy for heating and keeping heat can be saved.

Moreover, the split hot water supply according to the present invention is a washing hot water tank when a certain amount of hot water detected by the high water level detection switch and the low water level detection switch attached to the water heater accumulates in the water heater. The water is supplied to the washing water tank and is repeated until the water level detection switch attached to the washing water tank is activated.Therefore, the time until the hot water supply to the washing water tank is completed is constant, and the operation reliability of the operator for the dishwasher is constant. It will not hurt you.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the structure of a dishwasher and a water heater controlled by a control circuit according to the present invention and the relationship between them, and FIG. 2A is a circuit diagram showing a circuit for a dishwasher, 2B. FIG. 3 is a circuit diagram showing a water heater circuit, FIG. 3 is a time chart of a hot water supply cycle, FIG. 4 is a time chart of a cleaning cycle, and FIG. 5 is a time chart of a cycle of rinsing only. 1 ... Dishwasher, 2 ... Washing room 3 ... Washing nozzle, 4 ... Rinse nozzle 5 ... Washing water pipe, 6 ... Rinsing water pipe 7 ... Suction filter, 8 ... Filter 9 ... Washing Tank, 11 …… Tableware 12 …… Rack, 13 …… Water heater 14 …… Ball tap (water supply equipment) 15 …… Short circuit breaker, 16 …… Heat insulation heater 17 …… Washing hot water pump, 18 …… Rinsing hot water pump 19 …… power switch, 20 …… power lamp 21, 25 …… relay, 22 …… thermostat 23 …… door switch, 24 …… washable lamp 26 …… start switch 27 …… rinse switch, 28, 29, 40 ...... Relay 31, 32, 44, 45 ...... Diode 33 ...... Switch, 34 ...... Semi-fixed resistance 35, 36, 42 ...... Resistance, 37 …… Washing timer 38 …… Water level detection switch, 39 …… Pause Timer 41 …… Rinse timer, 43 …… Condenser 48 …… High water level detection switch Pitch 49 ...... low water level detection switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Microfilm (JP, U), which is a photograph of the contents of the specification and drawings attached to the application for Japanese Patent Application No. 50-148099 (No. 52-59469). A microfilm (JP, U) of the contents of the specification and drawings attached to the application of Japanese Utility Model Application No. 59-23698 (Japanese Utility Model Application No. 60-149373).

Claims (1)

[Scope of utility model registration request] 1. A dishwasher and water heater control circuit for automatically supplying hot water of a water heater to a washing water tank of a dishwasher by operating a rinsing hot water pump at the time of hot water supply. A water level detection switch for detecting a predetermined water level of the hot water in the wash water tank is provided, a high water level detection switch and a low water level detection switch are provided in the water heater, and hot water from the water heater to the wash water tank is provided. When the water level in the wash water tank does not reach a predetermined water level at the time of supplying, the high water level detection switch of the water heater operates via the water level detection switch of the wash water tank, and the rinse water pump Is supplied to the hot water tank, the hot water supply circuit configured to cut off the power supply to the rinse water pump when the low water level detection switch in the water heater operates, and the predetermined water level in the wash water tank is filled. A control circuit for a dishwasher and a water heater, which is configured to operate until the water level detection switch in the washing water tank is switched.