JPS6115790Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a dishwasher that forcibly drains the washing water in the washing tank using a drain pump, and in particular, prevents the siphon phenomenon by preventing unexpected washing water from being drained to the outside due to the siphon phenomenon. It's about structure.

Embodiments of the present invention shown in the drawings will be described in detail below. First, in FIG. 1, 1 is the main body of the washing machine, 2 is a washing tank that is housed in the main body 1 and forms a washing chamber for washing dishes, 3 is a door that opens and closes the opening of the washing tank 2, and 4 is a door that opens and closes the opening of the washing tank 2. This is a filter placed inside the cleaning tank 2. Note that the washing water injection nozzle, washing pump, and dish basket for storing the dishes necessary for washing the dishes are omitted in the drawing.

Reference numeral 5 denotes a drainage path which opens one end to the bottom of the cleaning tank 2 and the other end to the outside of the main body 1. A drainage pump 6 is interposed at a position below the cleaning tank 2, and the downstream side of the pump 6 is connected to the cleaning tank. It is located at a higher place than the specified water level a of 2, and an external drainage hose 7 is installed at its outer end.
is connected. Reference numeral 8 denotes a normally open valve device for preventing the siphon phenomenon, which is provided in a part of the drainage path 5 at a location higher than the specified water level a, and is constructed as shown in FIG.

In FIG. 2, reference numeral 9 has a valve holder 10 in its midsection, and a valve chamber 9' is formed below the valve holder 10, and the lower end of the valve chamber 9' is opened into the drainage path 5. A valve cylinder 11 is formed in the valve holder 10 and communicates the valve chamber 9' with the atmosphere. A valve hole 12 is located in the valve chamber 9' and connects the valve hole 11. It is a plate-shaped valve body that opens and closes, and the valve hole 11 is always opened by its own weight.The valve cylinder 9, valve chamber 9', valve hole 11, valve body 12, etc. constitute the valve device 8 for preventing the siphon phenomenon. do. The above valve holder 10
The valve seat 10' that comes into contact with and separates from the valve body 12 is formed to be appropriately inclined with respect to the horizontal plane. Reference numeral 13 indicates a fine-mesh filter stretched over the lower end of the valve cylinder 9, that is, the communicating portion between the valve device 8 and the drainage path 5.

Next, the operation of the above embodiment will be explained. Normally, the valve device 8 is in an open state, with the valve body 12 separating from the valve seat 10' due to its own weight, as shown in FIG. 2b.

Now, when water is started to be supplied to the cleaning tank 2, the supplied water accumulates in the cleaning tank 2 and gradually rises in water level, and also flows into the drainage path 5, discharging the air in the drainage pump 6. Become. This expelled air passes through the drainage path 5 and reaches the valve device 8.
The water passes through the filter 13 and the valve hole 11 as indicated by the dotted arrow in FIG. 2b and exits out of the drainage path 5. Then, the water supply operation is stopped when the water level in the cleaning tank 2 reaches the specified water level a.

Next, when the cleaning operation is finished and the draining operation begins,
The cleaning water in the cleaning tank 2 is forcibly drained to the outside via the drainage path 5 and the external drainage hose 7 by the action of the drainage pump 6. At this time, drain pump 6
A part of the washing water pumped by the filter 13
The liquid flows into the valve cylinder 9 through the air, pushing up the valve body 12, bringing the valve body 12 into contact with the valve seat 10', and closing the valve device 8 as shown in FIG. 2a. Therefore, there is no risk of wash water flowing out through the valve hole 11 during the drain operation. The filter 13 removes kitchen waste such as rice grains from the washing water and prevents the kitchen waste from adhering to the valve body 12 or valve seat 10'.
This ensures that the valve hole 11 is closed by the valve body 12.

When the drainage is completed and the drainage pump 6 is stopped, the water pressure in the drainage path 5 decreases and the water level decreases, and the valve body 12 descends due to its own weight and the gravitational force of the water, causing the valve hole 11 to fall. to open. Then, air enters the drainage path 5 as shown by the solid arrow in FIG. 2b through the valve device 8 which is in the open state. In addition, since the valve body 12 is made so that the valve seat 10' is appropriately inclined with respect to the horizontal plane so that water can be drained easily, the water does not remain in contact with the valve seat 10' due to the surface tension of the water, and the water level is lowered. Valve seat 1 as it decreases
0' to open the valve hole 11.

Therefore, even if the next stage water supply operation is started following the stop of the drain pump 6, the inconvenience of washing water being drained to the outside due to the siphon phenomenon will not occur.

In the above-mentioned embodiment, air is vented from the drain pump 6 by the siphon prevention valve device 8, and there is no need to provide an air vent means in the drain pump 6, which is advantageous in terms of the structure of the drain pump.

According to the present invention as described above, the valve seat is appropriately inclined with respect to the horizontal plane so that water can be easily drained between the valve seat and the valve body, so that the surface tension of the water causes the valve body to close to the valve seat during the opening operation. There is no risk of it remaining stuck to the side, and the opening operation can be performed reliably.
This is extremely useful in practice because it can reliably prevent unexpected drainage of washing water to the outside due to the siphon phenomenon.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the dishwasher according to the present invention, and FIGS. 2a and 2b are sectional views showing different states of the valve device. 5...Drainage route, 6...Drainage pump, 8...Valve device for preventing siphon phenomenon, 10'...Valve seat.

Claims (1)

[Scope of utility model registration request] A valve device for preventing siphon phenomenon is provided, in which a valve hole is formed in the upper part of the valve chamber to communicate the valve chamber with the atmosphere, and a plate-shaped valve body is provided in the valve chamber to keep the valve hole open at all times by its own weight. On the other hand, a part of the drainage path that includes the drainage pump is located at a higher place than the specified water level of the cleaning tank, and the high part of this water supply path communicates the inside of the water path with the lower part of the valve chamber of the valve device. The inside of the drainage path is configured to communicate with the atmosphere through the valve chamber and the valve hole, and the valve body is pushed up by water pressure to block the valve hole when the drainage pump is forced to drain water. A dishwasher characterized in that a valve seat in contact with a valve body is appropriately inclined with respect to a horizontal plane.