JP2000139808A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unreasonable continuity of water supply due to a state where a water feeding valve can not be closed perfectly because of a fault or biting of foreign matters. SOLUTION: This dishwasher is provided with the water feeding valve 10 intermittently receiving water (w) supplied for washing dishes from a water feeding source 7 and a control means automatically open/close-operating the valve 10 according to a set operation program. In this case, as the valve 10, a plurality of valves 10a and 10b for uniformly switch-operating to an opening state and a closing state by automatic operation by the means 23 are inserted to a water feeding path 6 from the source 7 in a serial state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply valve for intermittently receiving water supplied from a water supply source for washing dishes, and a control means for automatically opening and closing the water supply valve according to a set operation program. And a dishwasher comprising:

[0002]

2. Description of the Related Art Conventionally, in this type of dishwasher, a single water supply valve interposed in a water supply path from a water supply source is automatically opened and closed according to an operation program to provide water for dishwashing (water heater). (In some cases, hot water supplied from the company is used) according to a predetermined cleaning procedure.

In addition, a manual on-off valve is interposed in the water supply passage in series upstream of the water supply valve, and when necessary for inspection or repair, the water supply is shut off by manually closing the on-off valve. Some have made it possible.

Further, as a countermeasure against water leakage, it is detected that the level of the cleaning water in the cleaning tank is higher than a predetermined level, or overflow of the cleaning water from the cleaning tank is detected. In some cases, the water supply valve is automatically closed or an alarm is issued.

[0005]

However, in the above-mentioned conventional dishwasher, when the washing operation is advanced in a situation where the user is absent, for example, when the user starts the washing operation and goes out, the water supply is performed. If the valve is unable to close completely due to its own failure or bite of foreign matter, water supply will continue for a long time even if there is an alarm or a manual on-off valve,
For this reason, there has been a problem that a serious water leakage accident may be caused, and even though the water leakage function can be avoided by the drainage function, a large amount of water is consumed.

In particular, in the type in which hot water supplied from a water heater is received as washing water, while the water supply (hot water supply) is continued for a long time as described above, the hot water supply operation of the water heater is also continued for a long time.
There was also a problem that the heat source cost wasted greatly.

[0007] In view of this situation, the main problems of the present invention are:
The present invention is to effectively prevent the water supply from being unduly continued due to the water supply valve being unable to close completely for some reason.

[0008]

According to the first aspect of the present invention, a water supply valve for intermittently receiving water supplied from a water supply source for washing dishes, and the water supply valve according to a set operation program. A control means for automatically opening and closing the water supply source, wherein, as the water supply valve, a plurality of valves for uniformly switching between an open state and a closed state by automatic operation by the control means are connected in series with each other. To be installed in the water supply channel.

According to this configuration, among the plurality of valves that are uniformly opened and closed by the control means in accordance with the operation program, some of the valves cannot be completely closed due to a failure or a bite of foreign matter. Even if it becomes the state, the water supply can be stopped by closing other valves, thereby effectively preventing unfair continuation of water supply because the water supply valve can not be completely closed compared to the conventional dishwasher. In this way, it is possible to avoid a water leakage accident due to the improper continuation of the supply of water and a large waste of a water supply fee, and a large waste of a heat source cost in a case where hot water supplied from a water heater is used as washing water.

[2] According to the second aspect of the present invention, in the above-described first aspect of the invention, the plurality of valves which are uniformly opened and closed by the control means as the water supply valve are different types of valves.

[0011] According to this configuration, by using a plurality of valves having different types as the water supply valves,
Compared to using the same type for these multiple valves,
It is possible to effectively reduce the possibility that all of the plurality of valves cannot be completely closed at the same time due to the same cause, and thereby the water supply valve cannot be completely closed for some reason. Unjust continuation of water supply can be prevented more effectively.

[3] In the invention according to claim 3, the water supply valve for intermittently receiving water supplied from the water supply source for washing dishes, and the water supply valve is automatically opened and closed according to a set operation program. In a dishwasher provided with control means, a cutoff valve for automatically closing when an abnormality is detected is interposed in a water supply path from the water supply source in a state in series with the water supply valve, separately from the water supply valve.

According to this configuration, the water supply valve which is opened / closed by the control means in accordance with the operation program cannot be completely closed due to a failure or a bite of a foreign substance, so that the water supply is not stopped. Even if things happen,
The water supply is stopped by automatically closing the shut-off valve based on the detection of the abnormal situation, thereby making it impossible to completely close the water supply valve as compared with a conventional dishwasher. The continuation can be effectively prevented, and water leakage accidents due to such improper continuation of water supply and large waste of water bills,
Further, large waste of heat source costs in the case of using hot water supplied from a water heater as washing water can be avoided.

[0014] Specifically, the above-mentioned abnormality detection includes specifically detecting that the water supply valve cannot be completely closed, or abnormally increasing the water level in the washing tank due to the fact that the water supply is not stopped. Various methods can be adopted, such as detecting overflow of cleaning water from the cleaning tank.

[4] According to a fourth aspect of the present invention, in the above-described third aspect of the present invention, the control means includes:
At the end of a series of washing steps for opening and closing the water supply valve according to an operation program, the shutoff valve is closed together with the water supply valve.

According to this configuration, at the end of a series of washing steps in which the water supply valve is opened and closed according to the operation program,
Since the shutoff valve is closed together with the water supply valve and the water supply path is in a double shutoff state, the water supply after the end of a series of washing steps (that is, when the dishwasher is stopped) can be more reliably shut off. Thereby, it is also possible to effectively prevent the water supply leak from continuing for a very small amount in the operation stop state due to deterioration of the valve due to long-term use.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a dish washer / dryer, in which a washing tank 3 for accommodating a dish basket 2 is provided inside a main body case 1 and a dish basket 2 is put in and out of a front part of the main body case 1. A door 1a is provided, and a sprinkler 4 having a plurality of fountain ports 4a and an electric heater 5 are provided below the tableware basket arrangement portion in the washing tank 3.

Reference numeral 6 denotes a water supply channel for introducing high-temperature water w supplied as cleaning water from a separately provided water heater 7 as a water supply source through a hose 8 into the cleaning tank 3. The water supply channel 6 includes a strainer 9 and a cleaning water. A water supply valve 10 for intermittently receiving the high-temperature water w into the tank 3 is provided. Note that the water heater 7 automatically enters the water-flow heating operation when the water supply is started by opening the water supply valve 10, and automatically performs the water-flow heating operation when the water flow is stopped by closing the water supply valve 10. Stop.

Reference numeral 11 denotes a washing tank 3 via a garbage filter 12.
A circulation path for sending the water discharged from the washing device 4 to the sprinkler 4, a drainage path for discarding the water discharged from the washing tank 3 through the garbage filter 12 to the outside of the case 1, and a circulation pump 14 The drainage passage 13 is provided with a drainage pump 15.

The drain passage 13 is provided with a pipe rising section 13a for preventing backflow, a water sealing trap 13b and a check valve 13c are interposed, and a siphon phenomenon is provided for the pipe rising section 13a. A water level switch 17 that is turned on when the water level in the cleaning tank 3 reaches a predetermined water level for cleaning, and a water level switch 17 that is turned on when the water level in the cleaning tank 3 further rises, Switch 18 that turns on when the water overflows from the door
Is equipped.

Reference numeral 19 denotes an air supply passage through which air outside the case 1 is introduced into the cleaning tank 3 by a fan 20 as drying air, 21 denotes an exhaust passage through which air in the cleaning tank 3 is discharged outside the case, and
Reference numeral 22 denotes a temperature sensor attached to the bottom of the cleaning tank 3.

Reference numeral 23 denotes a controller as a control means for automatically performing dish washing and subsequent dish drying. The controller 23 has an operation switch (not shown) turned on by a user.
When the N operation is performed, a cleaning operation, a predetermined number of rinsing operations, and a drying operation are sequentially performed in accordance with the set operation program. In the cleaning operation and each rinsing operation, first, the water supply valve 10 is opened and the water heater 7 is turned on. Is supplied to the cleaning tank 3, and when the water level in the cleaning tank 3 reaches a predetermined water level for cleaning, the water supply valve 10 is closed based on the ON of the water level switch 17, and the reception of the high temperature water w is stopped.

Then, while controlling the electric heater 5 based on the detection information of the temperature sensor 22 to keep the temperature of the water in the cleaning tank 3 at the set temperature, the water in the cleaning tank 3 is operated by operating the circulation pump 14. Washing and rinsing of tableware is performed by spouting from the fountain port 4a of the sprinkler 4 and watering by the circulating pump operation is continued for a predetermined time.
To drain the water in the washing tank 3 to the outside, and then proceed to the next operation.

In the last rinsing operation, in controlling the electric heater 5, the temperature of the water in the cleaning tank 3 is maintained at a higher set temperature than in the previous cleaning operation and the rinsing operation. In the cleaning and rinsing by the operation of the circulation pump 14, the water sprinkler 4 is rotated around the vertical axis by the recoil of the jet of water to perform the cleaning and rinsing efficiently.

The water supply valve 10, which is opened and closed by the controller 23 in accordance with an operation program in the above-described series of washing steps over a washing operation and a predetermined number of rinsing operations, is opened and closed by the automatic operation of the controller 23. Two electromagnetic valves 10a and 10b that are uniformly switched are interposed in the water supply passage 6 in a serial state, so that the water supply valve 10 is opened and closed according to an operation program.
Even if one of the two solenoid valves 10a and 10b cannot be completely closed due to a failure or a bite of a foreign substance, the water heater 7 can be closed by the other solenoid valve.
The supply of high-temperature water from the plant can be reliably stopped.

The two solenoid valves 10a and 10b used as the water supply valve 10 are of different types, so that the two solenoid valves 10a and 10b can be completely closed simultaneously for the same reason. It is also intended to reduce the possibility that the valve will not be able to be opened.

When a series of washing steps over a washing operation and a predetermined number of rinsing operations are completed, the controller 23 operates the drain pump 15 to drain the water in the washing tank 3 to the outside, and then turns the electric heater 5 on. While the inside of the washing tank 3 is heated by the operation, the fan 20 is operated to introduce external air into the washing tank 3 and to perform a heating and drying operation for discharging the air containing moisture from the washing tank 3. After the heating and drying operation is performed for a predetermined time, an indicator lamp (not shown) indicating the end of the dishwashing and drying operation is turned on to end a series of operations.

When the overflow switch 18 is turned on, the controller 23 automatically closes the two solenoid valves 10a and 10b as the water supply valve 10 and displays an indicator light (not shown) indicating occurrence of an abnormality. ) Lights up to stop driving.

[Another Embodiment] Next, another embodiment of the present invention will be listed.

In the above-described embodiment, two water supply valves are provided in the water supply passage in series in a state in which two valves that are uniformly switched between an open state and a closed state by an automatic opening / closing operation according to an operation program are operated. In this way, three or more valves that are uniformly switched between the open state and the closed state may be interposed in the water supply passage in series as water supply valves.

Further, instead of providing a plurality of valves for uniformly switching between an open state and a closed state as a water supply valve in a water supply path in a serial state, a water supply valve for automatically opening and closing according to an operation program in a series of washing steps. Separately from the valve, a shutoff valve that is automatically closed when an abnormality is detected is interposed in the water supply passage in series with the water supply valve (for example, 10a in the configuration shown in FIG. 1 described above).
Is the water supply valve, whereas 10b is the above shutoff valve)
You may do so.

Further, in the case where the above-described configuration in which the shutoff valve is provided is adopted, the shutoff valve is closed together with the water supply valve by the control means at the end of a series of washing steps for opening and closing the water supply valve according to the operation program. The water supply can be more reliably shut off after the end of a series of washing steps (that is, when the operation of the dishwasher is stopped).

Various types of valves can be used as a plurality of valves and the above-mentioned shut-off valves to be interposed in the water supply path in series as the water supply valve, and to be interposed in the water supply path in series as the water supply valve. Preferably, the plurality of valves are of different types, but may be of the same type.

As a water supply valve, a plurality of valves interposed in the water supply passage in series may be integrated, or a water supply valve and a shut-off valve interposed in the water supply passage in a series state may be integrated into a single unit. You may make it easy to assemble inside.

The water supply source is not limited to the water heater, but may be a general tap. Further, the present invention can be applied to a dishwasher having no dish drying function, and the specific structure for washing dishes is not limited to the structure shown in the above embodiment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a dishwasher and dryer.

[Explanation of symbols]

 Reference Signs List 6 water supply channel 7 water supply source 10 water supply valve 10a valve (water supply valve) 10b valve (shutoff valve) 23 control means w washing water

Claims (4)

[Claims] 1. A dishwasher comprising: a water supply valve for intermittently receiving water supplied from a water supply source for dishwashing; and control means for automatically opening and closing the water supply valve according to a set operation program. A dishwasher in which a plurality of valves for uniformly switching between an open state and a closed state by an automatic operation by the control means are arranged in series in the water supply path from the water supply source as the water supply valve. 2. The dishwasher according to claim 1, wherein said plurality of valves are of different types. 3. A dishwasher comprising: a water supply valve for intermittently receiving water supplied for washing dishes from a water supply source; and control means for automatically opening and closing the water supply valve according to a set operation program. A dishwasher in which, apart from the water supply valve, a shutoff valve for automatically closing when an abnormality is detected is interposed in a water supply path from the water supply source in a state of being in series with the water supply valve. 4. The dishwasher according to claim 3, wherein the control means closes the shutoff valve together with the water supply valve at the end of a series of washing steps for opening and closing the water supply valve according to an operation program. .