JPH0543739Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to various types of washing machines such as dishwashers and utensil washers.

[Prior art]

As one type of washing machine, an injection nozzle is arranged in a washing chamber with a tank at the bottom, and washing water from the tank is circulated and supplied to the injection nozzle through a water supply pipe by a circulation pump, and drained by a drainage pump. There are cleaning machines that discharge water through a pipe.

In this type of washing machine, as a means to prevent unexpected drainage of washing water through the drainage pipe due to the siphon phenomenon,
As shown in the above publication, there is a method of providing a drain pipe with a branch pipe that opens at a portion above the specified water level of the tank. In addition, in this type of washing machine, in order to prevent washing water from overflowing in the tank, a means for detecting an abnormal level of washing water and a drive control means for driving a drain pump in response to a signal from the detection means are provided. Sometimes.

[The problem that the idea aims to solve]

By the way, in the former drainage prevention means among the above-mentioned prevention means, when the wash water is discharged, a part of it flows back into the tank through the branch pipe, reducing the drainage efficiency. In particular, since the washing water to be drained contains leftover food and other impurities, if the branch pipe is made smaller in diameter to reduce the amount of washing water returned, the pipe may become clogged.

Furthermore, the latter method for preventing overflow of washing water is expensive and cannot prevent overflow of washing water when the detection means, control means, drainage pump, etc. malfunction.

Furthermore, with both of the prevention means, it is not possible to easily check whether the drainage pump and drainage pipe are normal, or whether they are clogged with foreign matter and the drainage capacity is reduced.

Therefore, an object of the present invention is to simultaneously improve the drainage efficiency of wash water, inexpensively and reliably prevent overflow, and facilitate maintenance checks of the drainage system.

[Means to solve the problem]

The present invention provides the above-mentioned type of washer, in which an overflow drainage pipe that opens upward into the tank at a predetermined height part of the tank is provided to protrude upward from the bottom of the tank, and The drain pipe is characterized in that the distal end portion of the drain pipe faces the upper opening of the drain pipe.

[Functions and effects of the idea]

According to this configuration, a drainage path is formed by the drainage pipe and the overflow drainage pipe, and air flows into the drainage path from the upper opening of the overflow drainage pipe, so that unexpected drainage of cleaning water due to the siphon phenomenon can be prevented. At the same time, when the wash water is drained, it is possible to obtain the effect that the wash water falls from the opening at the end of the drain pipe to the upper opening of the overflow drain pipe, and the overflow of the wash water is always prevented by the action of the overflow drain pipe. can do. Therefore, when washing water is drained, there is no backflow to the tank, improving drainage efficiency, and overflowing of washing water can be reliably prevented at a low cost. In addition, it is possible to easily check the washing water flowing into the tank from the opening at the end of the drainage pipe to the upper opening of the overflow drainage pipe, and it is possible to accurately identify abnormalities in the drainage system based on the flow state of the washing water. maintenance of the drainage system can be carried out easily.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows an example in which the present invention is applied to a dishwasher, and the dishwasher is equipped with a washing chamber 12 inside an exterior case 11, and a lower part of the washing chamber 12 is a tank 13 that stores washing water. and spray nozzles 1 are provided in the upper and lower parts of the cleaning chamber 12, respectively.
4 and 15 are arranged, and these two nozzles 1
Between 4 and 15, a rack B storing various tableware A can be taken in and out through the front opening 12a of the washing cabinet 12. Note that the front opening 12a is opened and closed by a door body 16.

A circulation supply mechanism 20a, a drainage mechanism 20b, and various other parts and members not shown are housed in the space between the exterior 11 and the washing chamber 12. In the circulation supply mechanism 20a, three pumps connected to the circulation pump 21 are housed. Of the water supply pipes, a first water supply pipe 22 is connected to the lower side of the tank 13, a second water supply pipe 23 is connected to the upper injection nozzle 14, and a third water supply pipe 24 is connected to the lower injection nozzle 15. In addition, in the drainage mechanism 20b, a drainage pump 25
Of the two drain pipes connected to the tank 13, the first drain pipe 26 is connected to the bottom of the tank 13, and the second drain pipe 2
The tip of the pipe 7 faces the upper opening of the overflow drain pipe 28 in the tank 13 with a predetermined distance therebetween. Further, as shown in FIGS. 1 to 3, a cylindrical cover 29 having a notch 29a in the front and a closed upper end is attached to the tip of the second drain pipe 27. During the washing and rinsing process described later, the washing water overflows into the drain pipe 2.
8 and prevents it from flowing out of the machine.
The overflow drainage pipe 28 is a pipe with a large diameter at its upper end, and is attached to the lower part of the tank 13 in a liquid-tight manner so as to protrude upward.
It opens upward into the tank 13 at a predetermined height location (a location slightly higher than the specified water level L). Note that the tip of the overflow drain pipe 28 penetrates the exterior 11 and projects to the outside.

In a dishwasher with such a configuration, the washing chamber 1
Hot water is supplied to tank 1 from hot water pipe 17 facing inside 2.
The cleaning water in the tank 13 is supplied to each injection nozzle 14, 15 by driving the circulation pump 21, and the supplied cleaning water is supplied to each injection nozzle 14, 15 for cleaning. Warehouse 1
It is injected into 2. After the set cleaning time has ended, the circulation pump 21 is stopped and the drain pump 25 is driven for a predetermined period of time to drain the cleaning water in the tank 13. After the water is drained, the supply valve 18 installed in the hot water supply pipe 17 opens to supply hot water to the tank 13, and the hot water in the tank 13 reaches the specified water level L.
When reaching this point, the supply valve 18 closes to stop the water supply, and at the same time, the circulation pump 21 is driven again. As a result, the cleaning water in the tank 13 is supplied to each injection nozzle 14, 15 and is injected into the cleaning chamber 12 to start the rinsing operation, and after the set rinsing time ends, the circulation pump 21 is stopped and The drain pump 25 is driven, and the wash water in the tank 13 is drained.

However, in this dishwasher, air is configured to flow into the drainage path of the drainage mechanism 20b from the upper opening of the overflow drainage pipe 28, which opens at a portion higher than the specified water level L of the tank 13. There is no occurrence of siphon phenomenon in the drainage route, and unexpected drainage of the wash water is reliably prevented, and when the wash water is drained, the wash water falls from the opening at the tip of the drain pipe 27 to the upper opening of the overflow drain pipe 28. Inflow action (in this example, the overflow drain pipe 2
8 is set larger than the opening at the tip of the drain pipe 27, the cleaning water that falls from the opening at the tip of the drain pipe 27 flows into the overflow drain pipe 28 without scattering into the tank 13.) can be obtained. Further, the overflow drainage action by the overflow drainage pipe 28 can always reliably prevent the occurrence of overflow of the cleaning water. Therefore, there is no flow back to the tank 13 when washing water is drained, improving drainage efficiency, and overflowing of washing water can be reliably prevented at a low cost. Furthermore, it is possible to easily check the washing water flowing into the tank 13 from the opening at the tip of the drain pipe 27 to the upper opening of the overflow drain pipe 28 through the notch 29a of the cover 29. For example, if the flow rate is low or zero, check for blockages in the drain pipes 26 and 27 or the pump 25 due to leftovers, failure of the pump 25, or check for overflow from the opening at the tip of the drain pipe 27. When the washing water that has fallen into the upper opening of the drain pipe 28 overflows the pipe 28, clogging of the overflow drain pipe 28 can be accurately detected and maintenance of the drain system can be easily performed.

In the above embodiment, a cylindrical cover 29 was attached to the tip of the drain pipe 27 attached to the back vertical wall 12a of the washing chamber 12, but as shown in FIGS. A cover 29A is integrally provided at the tip of the drain pipe 27, and the cover 29A
It is also possible to implement the present invention by supporting 9A on the standing wall 12a (not shown). Note that the vertical wall 1 of the washing chamber 12 is located on the back of the cover 29A.
A standing wall 29b along 2a is provided, and the standing wall 1
A passage is formed that guides the wash water flowing down along the line 2a to the tank 13, and prevents the wash water from flowing into the overflow drain pipe 28.

Further, in the above embodiment, the upper opening of the overflow drainage pipe 28 is set larger than the opening at the tip of the drainage pipe 27, so that the cleaning water can accurately flow from the cleaning pipe 27 to the overflow drainage pipe 28, and the drainage At the initial stage (including drainage to prevent overflow), the air in the overflow drainage pipe 28 can be quickly discharged to ensure smooth drainage, but the upper opening of the overflow drainage pipe 28 is It is also possible to implement the present invention as being substantially the same as the opening. In this case, the cleaning water that is sprayed and scattered or falls in the cleaning chamber 12 during cleaning is removed from the overflow drain pipe 2.
Since there is almost no inflow from the upper opening of 8,
It is also possible to implement without cover 29 or 29A.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of a dishwasher showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts of Fig. 1,
3 is a front view of the same, FIG. 4 is a side view showing a modified example, and FIG. 5 is a plan view of the same. Explanation of symbols, 12...Washing chamber, 13...Tank, 14, 15...Injection nozzle, 20a...Water supply mechanism, 20b...Drainage mechanism, 21...Circulation pump, 22-24...Water supply pipe, 25 ...Drainage pump, 26, 27...Drainage pipe, 28...Overflow drainage pipe.

Claims (1)

[Scope of utility model registration request] An injection nozzle is disposed in a washing chamber provided with a tank at the bottom, and washing water from the tank is circulated and supplied to the injection nozzle through a water supply pipe by a circulation pump, and is discharged through a drainage pipe by a drainage pump. In the washing machine, an overflow drainage pipe that opens upward into the tank at a predetermined height of the tank is arranged to protrude upward from the bottom of the tank, and is opposite to the upper opening of the pipe. A washing machine characterized in that the distal end of the drain pipe is exposed.