JPS592764Y2 - Water level control device in dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water level control device for a dishwasher that has a simple configuration and can improve reliability.

Traditionally, dishwashers are always equipped with a water level control device, and the water level control devices are: ■ A pressure switch that only detects the water level during washing ■ A float that only detects the water level during washing What it does ■ Uses a single float to detect the water level during cleaning and temporary water level detection ■ Uses an overflow tank separate from the cleaning tank and a pressure switch to detect the water level during cleaning and detects the water level during overflow. There was a device that detected the water level in the event of overflow.

However, in cases ① and ③ above, if there is a large amount of leftover food, the filter will become clogged, and the pressure switch or float will not be able to operate correctly, resulting in overflow and the possibility of water leakage. In addition, in the case of (①) above, the water level during washing and the water level at the time of overflow can be detected, so there is no need to worry about water leakage even if there are a lot of leftovers, but if there is a float If there is a failure, it becomes impossible to detect any water level, so there is a high possibility of water leakage due to a misfire.

In case (1) above, reliability is significantly higher than in cases (2), (2), and (3) above, but since it is necessary to provide a separate overflow tank, it becomes bulky and causes an increase in cost.

In the case of (■), the overflowing cleaning water flows into the overflow tank, and the water supply is cut off due to the weight of this overflow tank, but the water level in the cleaning tank does not exceed the water level during cleaning. Even in some cases, the rotation of the nozzle during cleaning causes a waving phenomenon on the surface of the cleaning water, causing the cleaning water to gradually flow into the overflow tank. ,
Even if an overflow is detected by the overflow tank and water supply is stopped, the cleaning operation continues and the cleaning water continues to flow into the overflow tank, resulting in water leakage from the overflow tank.

The present invention solves the above-mentioned drawbacks by providing two tanks, each equipped with a water level detection means, to detect the water level during cleaning and to detect the water level during overflow. A water level control device for a dishwasher will be described in detail with reference to the accompanying drawings showing embodiments.

Fig. 1 is a partially cutaway front view of a dishwasher implementing the present invention, and Fig. 2 is a sectional view taken along line II-II of Fig. 1. A protective cover 3 is provided below the iron door 2.

An inner tank 4 with an open front surface is set inside the main body 1 close to one side wall surface, and a tableware basket 5 is provided at a predetermined height position of the inner tank 4 so that it can be taken in and out. A filter 7 is provided at a predetermined position below the tank 4, and a water storage tank 6 is formed below the filter 7.

Further, a water level control device 8, which is the main feature of the present invention, is provided between the inner tank 4 and the side wall of the main body 1, as well as a cleaning pump 9 and a drainage pump 10.

In addition, 11 is a lower nozzle located slightly lower than the tableware basket 5;
2 is an upper nozzle located above the tableware basket 5; 13 is a filter basket vertically disposed in the center of the filter 7; and 14 is a heater, which is separated from the inside of the water storage tank 6 by a heater cover 15.

Further, 16 is a water supply port communicating with a water faucet etc., 17 is a water supply valve driven by the water level control device 8, 18 is an exhaust port, 19 is a bottom plate, 20 is a handle of the door 2, and 21 is a controller. .

The water level control device 8, as shown in FIGS. 3 to 6,
Washing water level tank 2 with built-in flow) 21 and 22 respectively
3, overflow tank 24 and said flow) 21
．． It consists of normally open microswitches 25 and 26 that are activated by the rising of the water level tank 2.
3 is communicated with the water storage tank 6 via the rubber hose A, and the lowest holding position of the float 21 is formed below the filter 7, and furthermore, the cleaning water level tank 23
A shaft 27 erected in the center of a float 21 built into the tank 23 is made to protrude above the washing water level tank 23, and the shaft 27
A float cap 28 is integrally fixed to the protruding upper end of 7.

Reference numeral 29 denotes an L-shaped float lever for actuating the microswitch 26, one end of which is engaged with the float cap 28 and the other end engaged with the actuation piece of the microswitch 26, as shown in FIG. ing.

Furthermore, this float lever 29 is rotatably supported and is biased counterclockwise (in FIG. 7) by a spring (not shown); If not, the weight of the float 21 presses the operating piece of the microswitch 26 and holds it in the on state.

Further, as shown in FIGS. 3 to 6, the overflow tank 24 is connected to the upper part of the filter 7 in the inner tank 4 via a rubber hose B, and the lowest holding position of the float 22 is lower than the filter 7. formed above,
Furthermore, the float 22 built into the overflow tank 24 has a shaft 30, a float cap 31 . The normally open microswitch 25 is configured to be actuated via the float lever 32 and the float lever 32.

Note that 33 is a lid that closes the upper surfaces of the wash water level tank 23 and the overflow tank 24, and has a hole 34.35 at a predetermined position through which the shaft 27.30 can be inserted.

Reference numeral 36 denotes a communicating portion that communicates the tanks 23, 24 with each other at the top, and in this embodiment, the communicating wall 37 is formed integrally with each tank 23, 24 at the bottom.

Note that the communication wall 37 may be provided at the same height as the bottom wall of the overflow tank 24 to communicate the bottom of the overflow tank 24 and the wash water level tank 23.

Further, in FIG. 4, 38 is the door interior, and 39 is the inner tank gasket.

The operation of the dishwasher having the above configuration is as follows.

The dishwashing preparation is completed by holding the handle 20 to open the door 2, supporting the tableware basket 5 on which tableware such as plates and bowls is placed at a predetermined position in the inner tank 4, and then closing the door 2.

After completing preparations for washing dishes, when a switch (not shown) is turned on, water is supplied into the inner tank 4 from the water supply port 16 via the water supply valve 17, and gradually accumulates in the water storage tank 6.

The water level in the water storage tank 6 is the same as that in the cleaning water level tank 2 as described above.
3, the float 21 also rises as the water level in the water storage tank 6 rises, and the float lever 29 rotates counterclockwise accordingly.

When the water level in the water storage tank 6 reaches a predetermined level (slightly higher than the filter 7), the float lever 29 disengages from the actuating piece of the microswitch 26, and the microswitch 26 is turned off.

When the microswitch 26 is turned off, the water supply valve 17 is closed and the subsequent water supply is stopped, and the cleaning pump 9 is activated to start the cleaning operation.

When the washing/floating operation is pre-washing, the water in the water storage tank 6 is simply sprayed from the lower nozzle 11 and the upper nozzle 12 by the pump 9 to wash the dishes, but in the case of steam washing, the heater 1
4 to generate steam.

During this time, no water is flowing into the overflow tank 24, so the microswitch 25 is still ON, and the drain pump 10 is not operating, so it is operating normally. When the amount of adhering leftover food increases, the leftover food accumulates on the filter 7 and becomes more likely to cause clogging.

If the filter 7 becomes clogged with leftover food, the water level in the water storage tank 6 will not rise and water will accumulate at the top of the filter 7.

In other words, since the amount of water sucked up by the pump 9 is quite large, if the filter 7 becomes clogged, the amount of water sucked up will be greater than the amount of water that returns to the water storage tank 6 via the filter reflex, and the water storage tank 6 will actually be sucked up. The water level inside will drop and water will accumulate on the filter 7.

Therefore, the water level in the cleaning water level tank 23 does not rise and the micro switch 26 is turned on.
The water supply continues, and the water level on the filter 7 gradually rises.

When the water level on the filter 7 rises, the water level in the overflow tank 24 also rises, causing the float 22 to rise.

When the water level on the filter 7 reaches a predetermined water level, the amount of rise of the float 22 reaches a predetermined amount and the microswitch 25 is turned off, thereby operating the drainage pump 10 to drain the water on the filter 7. It is possible to reliably prevent wash water from overflowing.

Further, even if the float 21 in the wash water level tank 23 breaks down for some reason, overflow of the wash water can be reliably prevented by performing the same action.

In addition, if the rubber hose B for inflowing water into the overflow tank 24 is blocked for some reason (for example, by leftover food, etc.) and if the float 21° microswitch 26, etc. for controlling the water level is malfunctioning, the water will flow through the rubber hose B. Since no water flows in, the water level in the overflow tank 24 hardly rises even if the water level on the filter 7 reaches a predetermined water level.

However, as the water level on the filter 7 rises, more water falls into the water storage tank 6 through the filter 7, the water level in the water storage tank 6 rises, and the water level in the cleaning water level tank 23 rises through the rubber hose A. However, it finally flows over the guide wall 37 into the overflow tank 24.

As a result, the overflow float 22 floats up, turns off the microswitch 25, and operates the drainage pump 10 to drain the water in the inner tank, so overflow can be minimized and stopped.

Furthermore, since each tank 23, 24 is connected at the top, even if the water level in the water storage tank 6 fluctuates by about 1 to 2 cm due to the suction action when the cleaning pump 9 operates,
The displacement does not affect the water level in the overflow tank 24, and overflow is accurately detected.

In addition, if the bottom of the overflow tank 24 is extended and communicated with the cleaning water level tank 23, even if water flows into the overflow tank 24 through the rubber hose B due to a waving phenomenon on the surface of the cleaning water due to rotation of the nozzle, etc. Since the water flows into the washing water level tank 23 side, there is no possibility of overflow or erroneous detection due to the above-mentioned waving phenomenon.

As described above, according to the water level control device for a dishwasher of the present invention, it is possible to reliably prevent water leakage due to filter clogging, failure of the washing water level detection means, etc.

In addition, even if the communication part between the top of the aquarium filter and the overflow tank becomes clogged for some reason, the overflow tank is internally connected to the water level control tank, so overflow can be reliably detected and the water in the aquarium can be drained. Drainage can be carried out almost without overflowing, and water leakage is more reliably prevented.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing a dishwasher equipped with the device of the present invention, Fig. 2 is a sectional view taken along line II-II of Fig. 1, and Fig.
The figure is an enlarged longitudinal sectional rear view of the main parts of the water level control device, Fig. 4 is a sectional view taken along IV-IV in Fig. 3, Fig. 5 is a plan view of the main parts of the water level control device, and Fig. 6 is the main parts of the water level control device. a perspective view showing the part;
FIG. 7 is an enlarged view showing the microswitch drive section.

Claims (1)

[Scope of Claim for Utility Model Registration] A dishwasher in which a dish basket is provided at a predetermined height of an inner tank, a filter is provided below the dish basket, and the lower part of the inner tank is formed into a water tank. A cleaning water level tank that communicates with the water storage tank and an overflow tank that communicates with an inner tank above the filter are provided, and the cleaning water level tank and the overflow tank are communicated with each other. A water level control device for a dishwasher, characterized in that it is provided with a water level detection means.