JP2620141B2 - Dishwasher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher, and more particularly to an overflow means for discharging excess washing water out of the machine.

[Conventional technology]

Various overflow means have been proposed for a dishwasher, one of which has been proposed in Japanese Patent Application Laid-Open No. 58-105735. The overflow means proposed in this publication is to make an open end of an overflow pipe installed at the bottom of a tank (washing tank) into an inverted U-shape so as to be close to the bottom of the tank, and to have a small at the top of the bent part. A hole is provided.

[Problems to be solved by the invention]

In the overflow means described above, since the washing water with much dirt at the bottom of the tank (when the washing water is high temperature, low-temperature washing water with many dirts) can be overflowed, the dirt of the washing water (when the washing water is high temperature). In some cases, although there is an advantage that contamination of the washing water and a decrease in the water temperature can be reduced, the overflow pipe rises from the bottom of the tank, which hinders cleaning of the tank. The small holes may be clogged by residual vegetables, and in such a case, a siphon action occurs and the washing water is abnormally discharged. When the stoma is enlarged,
At the time of normal cleaning, a part of the cleaning water returning to the tank from above is gradually discharged from the small holes and reduced, and there is a possibility that a shortage of cleaning water may occur during long-time cleaning. There are problems such as.

DISCLOSURE OF THE INVENTION The present invention has been made in order to address the above-described problem, and has no portion protruding into the tank and its function is not impaired by residual vegetables and the like, and washing water does not run short even when washing for a long time. It aims to provide a washing machine.

[Means for solving the problem]

In order to achieve the above object, in the present invention,
Cleaning water supplied from outside the machine by a water supply device into a tank provided at the lower part of the washing chamber is supplied under pressure to a washing nozzle provided in the washing chamber by a circulation supply device to wash dishes stored in the washing chamber. In the dishwasher as described above, a discharge pipe which is derived from the bottom of the tank, has a top at a first overflow water level above a prescribed water level in the tank at an intermediate portion, and is provided with a discharge port outside the machine. A communication pipe is provided which opens at one end into the tank at a second overflow level above the first overflow level and opens at the other end at the rising side of the discharge pipe at the top. When the water level in the tank is equal to or higher than the first overflow water (but lower than the second overflow water level), the drain pipe passes from the bottom of the tank. (Lot of dirt, or a dirty cold washing water) washing water reaches the top Te is discharged outside from the discharge port of the discharge pipe beyond the top. At this time, since the air in the top of the discharge pipe is discharged into the tank through the communication pipe, the discharge of the washing water exceeding the top of the discharge pipe is not hindered by the air.

Further, when the water level in the tank is equal to or higher than the second overflow water level, washing water flows into the communication pipe, and the washing water in the tank is quickly drained through the discharge pipe and the communication pipe by natural drainage or drainage by siphon action. Is discharged. When the water level in the tank becomes lower than the second overflow water level due to such a discharging action, air flows into the communication pipe, and the siphon action is lost, and the overflow water discharged thereafter is naturally discharged through the discharge pipe. Only.

Further, in the dishwasher according to the present invention, the other end of the communication pipe is opened to the top at the rising side of the discharge pipe. Since the washing water flows down to the rising portion of the discharge pipe and substantially returns to the tank, there is no shortage of washing water even during long-time washing.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In the dishwasher according to the present invention shown in FIGS. 1 to 3, the main body 10 is composed of a front wall 11, both side walls 12, 13, a rear wall 14, and a bottom wall.
15 and an arc-shaped shielding plate 16 and a tank 17. An opening A which is opened and closed by a sliding door (hereinafter simply referred to as a door) 18 is formed at the upper front, and an upper wall 19 is formed at the upper rear. An opening is formed to be covered by the cover. Further, in the main body 10, washing nozzles 22 and 23 for spraying washing water from above and below are arranged on a tableware 21 stored together with a rack 20 in a washing room R1 opened and closed by a door 18, and these are provided. Both cleaning nozzles 22 and 23 have
A circulation supply device 24 (supply pump 24a and supply pipes 24b, 24c, 24d) provided in a machine room R2 formed between the tank 17 and the bottom wall 15.
The cleaning water in the tank 17 is supplied under pressure. In addition, in the machine room R2, in addition to the circulation supply device 24, a forced drainage device 25 (consisting of a drainage pump 25a and drainage pipes 25b and 25c) is provided, and various parts and members (not shown) and control parts are omitted. A device (a device that is operated by an operation switch 26 provided on the front wall 11 and controls the operation of the circulating supply device 24, the drainage device 25, and the like in a predetermined cleaning cycle and a rinsing cycle) and the like are housed.

The arc-shaped shielding plate 16 is fixed to the left and right ends slightly below the upper wall 19 of the main body 10 to the side walls 12 and 13 and extends rearward by a predetermined amount, and supports the cleaning nozzle 22. , 13, the upper portion of the rear wall 14, the upper portion of the rear wall 14, and the upper wall 19, form a space R3 above, and the side walls 12, 13, etc., form a washing room R1 below. Space R3 is an open door
While having the function as a storage space to store 18,
It has a function as an exhaust passage that discharges a part of the air in the cleaning chamber R1 that expands when high-temperature cleaning water is injected from the cleaning nozzles 22 and 23 to the outside. A part of the inflated air is discharged to the outside through a vent hole 19a provided in the upper wall 19, and the tip of the upper wall 19 and the closed door 18 are closed.
Is discharged to the outside through a gap formed with the rear end (upper end in the figure), and the accompanying water vapor (water droplets) is prevented from being discharged to the outside by the projection 19b provided on the upper wall 19. It is supposed to be.

The tank 17 has its peripheral edge fixed to the front wall 11, the side walls 12, 13 and the rear wall 14, and supports the washing nozzle 23.
The required amount of washing water can be stored. Tank 17
A water supply device 27 for supplying washing water from outside the machine into the tank 17 (a water supply pipe with a reference numeral connected to a water heater or a water supply (not shown) and a water supply pipe (not shown) interposed in the pipe). Water supply valve) and a drainage device
Discharge pipe 28 is provided in parallel with 25. The discharge pipe 28 is a first pipe derived from the bottom of the tank 17.
28a and a second pipe 28b having a discharge port 28b1 disposed outside the machine, and a first overflow water level l1 above a specified water level lo in the tank 17 is provided at an intermediate portion, that is, a connection portion between the two pipes 28a and 28b. A top H located therein is formed,
The drainage pipe 25c of the drainage device 25
Are connected and opened, and the communication pipe 29 is connected and opened. The communication pipe 29 is tanked at the second overflow level l2 above the first overflow level l1.
The upper end is connected to the opening 17 and the lower end is connected to the top H at the rising side of the first pipe 28a in the discharge pipe 28 and opens. Note that the opening direction of the communication pipe 29 to the tank 17 and the top H may be horizontal instead of vertical as shown in the figure, and may be changed as appropriate.

The door 18 has a handle 18a integrally on the outside of the front end thereof, is formed in an arc shape like the shielding plate 16, and is on both left and right sides of the opening A of the main body 10, that is, both side walls 12, 13. A pair of guide rails 31, 3 provided continuously on the front edge of
2 is fitted on both sides so as to be slidable along the opening and engageable in a direction substantially orthogonal to the opening. This door 18
Can be opened and closed by moving the handle 18 up and down (rotating).
It slides inside 31, 32 and the upper surface of the arc-shaped shielding plate 16 and does not protrude from the main body 10. The door
The closed position of 18 is that one end (lower end shown) 18b of the door 18 is the tank 1
7, the other end (upper end in the figure) 18c of the door 18 overlaps with the front end of the arc-shaped shielding plate 16 by a predetermined amount. Is defined by the handle 18a contacting the front end of the upper wall 19, and at that time, engagement protrusions 31a, 32a are provided at the upper ends of both guide rails 31, 32 so that the upper wall 19 does not significantly deform upward. Is formed. In addition, the door 18 can be removed from both the guide rails 31 and 32 by rotating backward with the upper wall 19 removed, and can be removed from the main body 10 by further lifting it up. I have.

The upper wall 19 has a peripheral edge excluding its front edge on both sides 12, 13 and the rear wall 1.
4. A storage space which is detachably attached to the side walls 12, 13 and the rear wall 14 by three screws 33 in a state of being joined to the upper edge of the door 4, and stores the door 18 when it is opened as described above. And a function of forming a space R3 having a function as an exhaust passage for discharging a part of the air in the cleaning chamber R1 to the outside, and a function as a stopper for defining an opening position of the door 18.

Guide rails 31 and 32 are shown in FIG.
As shown in detail by taking the side as an example, it is formed in a U-shaped cross section, a labyrinth is formed by the left and right sides of the door 18, and a water guide path P communicating with the tank 17 of the main body 10 at the lower end. Are formed. At the lower end of the opening A in the main body 10, that is, at the upper end of the front wall 11, a saucer 34 is formed. Receiving trays 34 are continuously provided to both left and right ends, and water leaks from a fitting portion between the two guide rails 31, 32 and the door 18 and flows down the surface of the door 18, and the door 18 and the cover.
The water vapor discharged from the gap between the 19 is formed as water droplets on the surface of the door 18 so as to receive the water flowing down, and the water flows into the tank 17.

In the present embodiment configured as described above, the cleaning chamber R1
The tableware 21 is stored in a rack 20 and washing water is supplied to the tank 17 together with a detergent in a predetermined amount so as to have a substantially specified water level lo (this water is supplied by hand from the opening A by hand). The operation may be performed by operating a water supply switch (not shown) to open the water supply valve of the water supply device 27), or by operating the operation switch 26 to start the cleaning cycle. Is pressurized and supplied by the pump 24a of the circulating supply device 24 for a set time, and is jetted from both the washing nozzles 22 and 23 to the tableware 21 to wash the tableware 21. After the elapse of the set time, the pump 24a of the circulation supply device 24 stops, and at the same time, the pump 25a of the
The washing water in 7 is discharged outside the machine. Further, after the discharge is completed, the pump 25a of the drainage device 25 is stopped, the water supply valve of the water supply device 27 is opened, and the washing water is continuously supplied from outside the machine into the tank 17, and the pump of the circulation supply device 24 is supplied. 24a is activated, and the rinsing cycle is executed for the set time. After the elapse of the set time, the pump 24a of the circulating supply device 24 stops, and at the same time, the pump 25a of the drainage device 25 operates for a predetermined time, and the washing water in the tank 17 is discharged outside the machine.

In the present embodiment, since the lower end of the communication pipe 29 is opened to the top H at the rising side of the first pipe 28a in the discharge pipe 28, the cleaning water flows into the communication pipe 29 at the specified water level lo. Even if the washing water flows, the washing water flows down to the rising portion of the discharge pipe 28 (a part of the first pipe 28a) and substantially returns to the tank 17, so that there is a shortage of washing water even during long-time washing. There is no.

Further, in the present embodiment, since the washing water is continuously supplied from the water supply device 27 in the rinsing cycle, the water level in the tank 17 is equal to the first overflow water level.
When it is not less than l1 (but less than the second overflow water level l2), the first pipe 28a of the discharge pipe 28 is discharged from the bottom of the tank 17.
The washing water that has reached the top H through the top H is discharged outside the machine from the discharge port 28b1 of the second pipe 28b in the discharge pipe 28. At this time, since the air in the top portion H of the discharge pipe 28 is discharged into the tank 17 through the communication pipe 29, the discharge of the washing water exceeding the top portion H of the discharge pipe 28 is not hindered by the air. If the amount of water discharged from the discharge pipe 28 and the amount of water supplied from the water supply device 27 are the same, the water level does not change, but if the amount of water supplied is larger than the amount of water discharged, the water level rises sequentially and reaches the second overflow water level l2. During this time, the top H
Since the inside becomes negative pressure, air is sucked in through the communication pipe 29 and the aerated water is discharged out of the machine through the discharge pipe 28.

The water level in the tank 17 is equal to the second overflow water level l2.
As a result, the washing water flows into the communication pipe 29, and the tank 17 is drained by natural drainage or drainage by siphon action.
The washing water inside is quickly discharged out of the machine through the discharge pipe 28 and the communication pipe 29. In addition, due to this discharge action,
When the water level in the tank 17 becomes lower than the second overflow water level l2, air flows into the communication pipe 29, the siphon action is lost, and the subsequent overflow drainage is only natural drainage through the discharge pipe 28. .

In the above embodiment, the present invention was implemented in a dishwasher provided with a forced drainage device 25. However, the present invention is applied to a dishwasher not provided with a forced drainage device (the washing water used in the rinse cycle is used in the next washing cycle). A dishwasher used as washing water) can be similarly or appropriately modified.

〔The invention's effect〕

In short, in the present invention, since the excess washing water in the tank can be overflow-discharged by the discharge pipe (28) and the communication pipe (29) disposed outside the tank (17), the obstruction projecting into the tank is prevented. There is nothing, and the inside of the tank can be easily cleaned. In addition, since the garbage and the like are discharged out of the machine through the two pipes (28, 29) together with the washing water, the functions of the both pipes are not impaired by the garbage and the like, and a stable operation is always obtained. Furthermore, since the washing water flowing into the communication pipe at the time of washing at the specified water level is returned to the tank through the discharge pipe,
Even when cleaning is performed for a long time, there is no shortage of cleaning water, and cleaning can be performed for a long time to enhance the cleaning effect.

[Brief description of the drawings]

1 is a longitudinal sectional side view showing one embodiment of a dishwasher according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 shows a fitting portion between a guide rail and a door. It is an expanded sectional view. Description of symbols 17: tank, 21: tableware, 22, 23: washing nozzle, 24
… Circulation supply device, 27… Water supply device, 28 …… Discharge pipe, 28b1 …… Discharge port, H …… Top, 29 …… Communication pipe,
R1: washing chamber, lo: prescribed water level, l1: first overflow water level, l2: second overflow water level.

Claims (1)

(57) [Claims] 1. A cleaning nozzle, which is supplied from the outside of the machine by a water supply device into a tank provided at a lower portion of a cleaning chamber, is supplied under pressure to a cleaning nozzle provided in the cleaning chamber by a circulation supply device, and is stored in the cleaning chamber. A dishwasher adapted to wash dishware, wherein a top portion is provided at a first overflow water level above a specified water level in the tank at an intermediate portion, which is derived from the bottom of the tank, and a discharge port is provided outside the machine. And a communication pipe that opens at one end to the tank at the second overflow level above the first overflow level and opens at the other end to the top at the rising side of the discharge pipe. Dishwasher characterized by the following.