JP3861437B2 - dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dishwasher for cleaning dishes by spraying washing water from a washing nozzle toward the dishes.
[0002]
[Prior art]
2. Description of the Related Art In recent years, dishwashers that wash tableware stored in a tableware basket with washing water sprayed from a nozzle that rotates in a washing tank have become mainstream.
[0003]
Conventionally, this type of dishwasher has been configured as shown in FIG. Hereinafter, the configuration will be described.
[0004]
As shown in FIG. 3, the cleaning tank 1 has an opening in the front, the opening 2 is opened and closed by a door 2, and a cleaning nozzle 3 for injecting cleaning water is rotatably provided therein. A table basket 5 for storing tableware 4 is disposed in the tank 1. As shown in FIG. 4A, the cleaning nozzle 3 has an inflow port 6 below the central axis and is in a position where it abuts on the outflow port 8 of the nozzle support portion 7. Is provided with a plurality of injection ports 9. The operation is controlled by the control means 10 and proceeds automatically.
[0005]
The washing water in the washing tank 1 is warmed by the heater 11, sucked from the residual filter 14 provided in the drain port 13 by the washing pump 12, pumped to the washing nozzle 3, and jetted from the jet port 9.
[0006]
At this time, the washing nozzle 3 is pressed downward by the reaction force of the washing water jetted from the jet port 9, and the inlet 6 and the outlet 8 come into contact with each other to form a water guide pipe portion 15. The tableware 4 stored in the basket 5 is washed with washing water jetted from the jetting port 9 vigorously.
[0007]
[Problems to be solved by the invention]
In such a conventional dishwasher, when the operation is stopped, the washing nozzle 3 is positioned at the lowest position by its own weight, and the inlet 6 and the outlet 8 are in contact with each other. When the cleaning pump 12 starts from this state and the cleaning water enters the cleaning nozzle 3 through the inlet 6, the cleaning nozzle 3 rises by water hammer.
[0008]
At this time, if the reaction force F in the downward direction due to the washing water ejected from the ejection port 9 is insufficient, the washing nozzle 3 rotates without settling as shown in FIG. Since cleaning water leaks from the gap between the inflow port 6 and the outflow port 8, a sufficient water pressure of the cleaning water cannot be obtained, and the cleaning performance may deteriorate.
[0009]
The present invention solves the above-mentioned problems, and ensures that the cleaning nozzle and the nozzle support are brought into contact with each other to prevent the leakage of cleaning water and to obtain a sufficient water pressure of the cleaning water, thereby obtaining more stable cleaning performance. The purpose is that.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a cleaning nozzle that sprays cleaning water while rotating in the horizontal direction substantially at the center of the bottom of the cleaning tank, and is pumped from the cleaning pump and sprayed upward from the cleaning nozzle. The control unit for driving the cleaning pump is configured so that the cleaning nozzle and the nozzle support portion are contacted in the axial direction by the reaction force of the cleaning water. The cleaning pump is stopped for a short time after it has been almost filled , so that the cleaning nozzle is brought into contact with the nozzle support portion in the axial direction to form a water conduit, and then the cleaning pump is started again to start the cleaning water. Is ejected from the washing nozzle through the water conduit .
[0011]
Thereby, the washing nozzle and the nozzle support portion can be reliably brought into contact with each other to prevent washing water from leaking, and by obtaining a sufficient washing water pressure, more stable washing performance can be obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, there is provided a cleaning tank, a cleaning nozzle that is disposed substantially at the center of the bottom of the cleaning tank and sprays cleaning water while rotating in the horizontal direction, and the cleaning nozzle sprays substantially upward. A nozzle support portion that forms an aqueduct pipe portion in axial contact with the cleaning nozzle by a reaction force of the cleaning water, a cleaning pump that pumps the cleaning water to the cleaning nozzle, and a control means that drives the cleaning pump And the control means performs a short stop of the cleaning pump after the cleaning nozzle is almost filled with cleaning water by the activation of the cleaning pump, so that the cleaning nozzle is attached to the nozzle support section. in the axial direction by abutment to form said water conduit portion, which is configured to inject from the cleaning nozzle through said conduit portion to the wash water by activating then the washing pump again, washed After the pump is started, the cleaning nozzle settles due to the weight of the cleaning nozzle and the cleaning water, and the inlet and outlet are in contact with each other by stopping for a short time while the cleaning nozzle is filled with the cleaning water. Since the cleaning nozzle rotates and jets the cleaning water, leakage of the cleaning water can be prevented, and a more stable cleaning performance can be obtained by sufficiently obtaining the water pressure of the cleaning water.
[0013]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
[0014]
As shown in FIG. 1, the control means 16 is configured to drive the cleaning pump 12, control the operation, and perform a short stop after the cleaning pump 12 is started. That is, as shown in FIG. 2, the signal for operating the cleaning pump 12 by the control means 16 starts the cleaning pump 12 at time T0, first turns it on for t1 seconds, turns it off for t2 seconds, and then turns it on again. It becomes. This time t2 seconds is a very short time and is set to the time from when the washing water from the injection port 9 of the washing nozzle 3 stops to the time when the washing water starts to flow downward from the inlet 6 of the washing nozzle 3. is doing.
[0015]
The operation of the above configuration will be described. When the cleaning pump 12 is started, the cleaning nozzle 3 is once lifted and rotated by the water hammer of the cleaning water. At this time, there is a gap between the inlet 6 and the outlet 8, and the washing water leaks. Next, when it stops after t1 seconds, the injection of the cleaning water from the injection port 9 stops, and then the cleaning nozzle 3 is not cleaned with water for t2 seconds until the cleaning water starts to escape from the inlet 6 of the cleaning nozzle 3. The cleaning nozzle 3 is in its heaviest state.
[0016]
For this reason, the washing nozzle 3 sinks to the lowermost position in the nozzle support portion 7, and the inflow port 6 and the outflow port 8 come into contact with each other reliably. When the cleaning pump 12 is activated again, the water nozzle into the cleaning nozzle 3 is alleviated by the fact that the cleaning nozzle 3 is in the heaviest state and the cleaning nozzle 3 is filled with cleaning water. Therefore, the cleaning nozzle 3 does not float and starts rotating with the inlet 6 and the outlet 8 in contact with each other. For this reason, leakage of washing water can be prevented, and more stable washing performance can be obtained by sufficiently obtaining the washing water pressure.
[0017]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cleaning tank, the cleaning nozzle that is disposed substantially at the center of the bottom of the cleaning tank and injects cleaning water while rotating in the horizontal direction, and the cleaning A nozzle support portion that forms an aqueduct tube portion in axial contact with the cleaning nozzle by a reaction force of cleaning water sprayed substantially upward from the nozzle, a cleaning pump that pumps cleaning water to the cleaning nozzle, and the cleaning and control means for driving the pump, said control means, by performing a brief stop of the wash pump after substantially is filled with washing water in the washing nozzle by activation of the wash pump, the cleaning nozzle the nozzle support by contact in the axial direction to form the conduit portion and the cleaning water adapted to inject from the cleaning nozzle through said conduit section by activating then the washing pump again Since the cleaning nozzle rotates and the cleaning water is jetted with the cleaning nozzle and the nozzle support portion in contact with each other reliably, the leakage of the cleaning water can be prevented, and the water pressure of the cleaning water can be sufficiently obtained. More stable cleaning performance can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a dishwasher according to an embodiment of the present invention. FIG. 2 is a time chart of operation of a washing pump of the dishwasher. FIG. 3 is a longitudinal sectional view of a conventional dishwasher. Cross-sectional view of relevant parts during normal operation of the dishwasher (b) Cross-sectional view of relevant parts during abnormal operation of the dishwasher [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Washing tank 3 Washing nozzle 7 Nozzle support part 12 Washing pump 15 Water conveyance pipe part 16 Control means

Claims (1)

A cleaning tank, a cleaning nozzle that is disposed substantially at the center of the bottom of the cleaning tank and that sprays cleaning water while rotating in the horizontal direction, and the cleaning nozzle is caused by a reaction force of the cleaning water sprayed substantially upward from the cleaning nozzle. A nozzle support that forms an aqueduct tube by abutting in the axial direction; a cleaning pump that pumps cleaning water to the cleaning nozzle; and a control unit that drives the cleaning pump, the control unit including the cleaning pump The cleaning nozzle is substantially filled with the cleaning water by the activation of the cleaning pump, and then the cleaning pump is stopped for a short time so that the cleaning nozzle is brought into contact with the nozzle support portion in the axial direction to A dishwasher configured to spray the cleaning water from the cleaning nozzle through the water conduit by forming and then restarting the cleaning pump .

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