JPH0970382A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a cleaning mechanism and to improve storing properties of tablewares by providing a rotational shaft of a motor in the vertical direction and a cleaning water guiding part communicating with the first and the second casings and a washing tank. SOLUTION: Cleaning water is guided from the first suction hole 14 of a cleaning water guiding part 13 to the first impeller 9 by rotating a motor 16 in the clockwise direction in the main washing process and the rinsing process. In addition, the cleaning water is guided from the second suction hole 15 of the cleaning water guiding part 13 to the second impeller 9 by rotating the motor 16 in the counterclockwise direction by means of a rightly and reversely rotational means 17. As the rotational shafts of the cleaning motor 16 and the impellers 9 and 11 are provided in the vertical direction, the first casing 10 is especially arranged below the second casing 12. By providing the cleaning water guiding part 13 between the first casing 10 and the second casing, both cleaning and drainage are made possible only by one motor 16. The vol. of the cleaning mechanism occupied by a pump 3 and the motor 16 is reduced thereby and the max. dimension of stored tablewares can be enlarged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing by spraying washing water, and more particularly to a method for improving dish-storability and washing efficiency.

[0002]

2. Description of the Related Art A conventional dishwasher is shown in FIG.
It will be described based on. Tableware basket 52 in the washing tank 51
Store in, put detergent and start operation. When the operation is started, first, a water supply process of supplying a predetermined amount of cleaning water to the cleaning tank 51 is executed. Subsequently, a main washing step is performed in which the washing water pressurized by the washing pump 53 and heated by the heater 54 is jetted from the washing nozzle 45 together with the detergent. The cleaning water is injected through the injection holes 56a to 56 of the cleaning nozzle 55.
It is injected vertically or obliquely upward from f. Further, the cleaning nozzle 55 is rotated substantially horizontally by this jet reaction force. Therefore, most of the washing water is jetted while being inclined in the direction opposite to the rotation direction of the washing nozzle 55, and collides with the dishes. By the action of this washing water collision force, detergent, heat, etc.
The dishes are to be washed. After the main washing step for a predetermined period of time, a draining step is performed in which the washing water containing the dirt washed off from the dishes and the like is discharged to the outside by the drainage pump 57. Subsequently, a water supply process of newly supplying wash water,
A rinsing step of spraying washing water from the washing nozzle 55 for rinsing dishware soiled with detergent and residual food (dirt attached to tableware is also referred to as residual food) and the drainage process are repeated four times in succession, The operation of the cleaning process is completed. Reference numeral 58 is a control device that controls the operation of the cleaning pump 53, the heater 54, and the like.

[0003]

DISCLOSURE OF THE INVENTION The dishwasher having the conventional structure has the following problems.

That is, the washing pump 53 and the drainage pump 57.
Since it has two pumps and a motor, the volume required for these cleaning mechanisms is large. Therefore, the ratio of the washing volume in which dishes can be stored is small relative to the total volume of the dishwasher. Therefore, the maximum size of the tableware that can be stored, the degree of freedom with respect to the shape, the number of tableware, and the like are limited, so that the tableware storage property is low.

Further, since two sets of pumps and driving motors thereof are required, the cost required for assembling these related component parts and their assembly is high.

Further, if air is drawn in through the suction port of the drainage pump 57, the pumping capacity is lowered and the wash water cannot be discharged, so that the water cannot be discharged at a lower water level than the height of the suction port. Therefore, there is a certain amount of cleaning water (hereinafter also referred to as residual water) remaining in the machine after each draining process. In particular, since much dirt such as oil stains and fine residual foods floating on the surface of the wash water during washing remains in this residual water, redeposition is likely to occur and the rinsing performance is low. In order to improve this, the operation method of increasing the number of rinsing steps or performing water supply and drainage at the same time has been adopted in the past, and dirt is discharged together with cleaning water to ensure a predetermined rinsing performance. However, there are problems such as a large amount of water used and a long operating time.

In order to solve the above-mentioned problems, the actual Kaihei 1
No. 138362, Japanese Utility Model Laid-Open No. 63-62073, and Japanese Unexamined Patent Publication No. 1-80331, cleaning and draining are performed by a single motor, the cleaning mechanism is downsized, and the tableware storage volume is expanded and low. There are some that are cost-effective. However, as a means for switching the cleaning water discharge pipe line between cleaning and drainage, the rotation direction of the motor is reversed and a switching valve is provided, which causes a problem that the structure becomes complicated. Moreover, the pumping capacity generally has a difference of about 5 times in discharge capacity between cleaning and drainage, but since the pump and impeller are set to the required size for cleaning, it is especially important to perform cleaning in the drainage process. When the water level of the water drops, the noise generated by stirring the wash water while entraining air may increase.

Further, as shown in Japanese Patent Publication No. 54-33668, there is also a construction in which a clutch is provided in addition to reversing the rotation direction of the motor as a switching means for switching the discharge line of the washing water between washing and draining. . This configuration solves the above-mentioned problem of noise because the impeller on the cleaning side does not rotate in the drainage process, but the number of components such as the clutch is large, which leads to downsizing and cost reduction. There are challenges such as difficulties.

The present invention solves the problems of the conventional structure as described above, and it is possible to obtain predetermined cleaning performance and drainage performance with a simple structure, and to reduce the size of the cleaning mechanism to reduce dishes. A first object of the present invention is to provide a dishwasher with an expanded storage capacity.

A second object of the present invention is to provide a dishwasher which has a high rinsing performance and saves water because it has a high drainage performance to a low water level and little residual water. .

Furthermore, especially with improvement of rinsing performance,
It is a third object of the present invention to provide a dishwasher having a high washing efficiency in which the motor and the pump as a whole are further downsized.

[0012]

A first means of the present invention for achieving the first object is to provide a cleaning tank, a tableware basket for storing dishes, a cleaning nozzle for spraying cleaning water, and a motor. It has a pump for pressurizing the cleaning water by rotation and a forward / reverse reversing means of the motor, and the rotation shaft of the motor is provided in a substantially vertical direction, and the pump supplies the cleaning water to the cleaning nozzle by the first impeller. A first casing for discharging,
A dishwasher including a second casing for discharging wash water to the outside of the machine by a second impeller, and a wash water guide portion communicating with the first casing, the second casing, and the wash tank Is.

A second means of the present invention for achieving the second object is a dishwasher in which, in addition to the first means, a second casing is arranged below the first casing. Is.

A third means of the present invention for achieving the third object is that the first impeller is a centrifugal type and the second impeller is a vortex type in addition to the first means or the second means. This is a dishwasher characterized by the above.

[0015]

According to the first means of the present invention, in the main washing step or the rinsing step, the washing water is sent from the washing water guiding portion to the first casing of the pump and pressurized by the operation of the first impeller. It is discharged to the cleaning means. Also, in the drainage process, by switching the rotation direction of the cleaning motor, the rotation directions of the rotary shaft and the impeller are reversed, the directions of suction and discharge are exchanged, and the cleaning water is sent to the second casing of the cleaning pump. As a result, the cleaning water can be discharged to the outside of the machine by being pressurized by the operation of the second impeller.

Moreover, since the cleaning motor and the rotary shaft of the impeller are provided in a substantially vertical direction, particularly when the first casing is arranged below the second casing, the first step is performed in the draining process.
Since the cleaning water in the casing is hardly agitated while entraining air, excessive noise during drainage can be prevented. In addition, since it is composed of a pump driven by one motor, the space for the cleaning mechanism can be reduced,
The ratio of the tableware storage volume to the total volume of the dishwasher will increase.

In the second means of the present invention, since the second casing is arranged at the lowermost portion, the drainage can be performed to an extremely low water level, and the amount of residual water including dirt after the drainage step is small. This increases the degree of dilution with new wash water in the rinsing process, and improves the rinsing performance.
Therefore, even if the number of times of rinsing and the amount of wash water used in each rinsing step are reduced, a predetermined rinsing performance can be obtained.

According to the third means of the present invention, the first impeller is of the centrifugal type and the second impeller is of the vortex type. Therefore, at the start of the drainage process, part of the wash water is the first casing. The cleaning water is discharged from the cleaning nozzle by being pressurized by the first impeller. As a result, the oil stains and fine residues left on the surface of the wash water are agitated again, and in a state where they are mixed with the wash water, they are guided to the second impeller in the second casing and outside the machine. It is what is discharged.

This is a peculiar operation of the first impeller of the centrifugal type, and since the dirt can be forcibly discharged and the remaining amount in the cleaning tank can be reduced, the rinsing performance is improved.
Therefore, in this means, the predetermined rinsing performance can be obtained even if the number of times of rinsing and the amount of water used for rinsing are further reduced, whereby water saving can be achieved. Moreover, the centrifugal impeller can more efficiently obtain the flow rate and discharge pressure required for the washing pump of the dishwasher than the vortex flow type, and the motor can be downsized.

[0020]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the first means of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a washing tank, and 2 is a dish basket for storing dishes, which is provided in the washing tank 1. 3 is a pump for pressurizing the wash water, 4 is a heater for heating the wash water and dishes, and 5 is a wash nozzle having jet ports 6a to 6f for jetting the wash water. Reference numeral 7 is a filter for separating the leftover food, and 8 is a control device for controlling the cleaning pump 3, the heater 4 and the like. The pump 3 is a vortex type first
The first casing 10 for discharging the cleaning water to the cleaning nozzle 5 by the impeller 9 and the second casing 10 for discharging the cleaning water outside the machine by the second vortex type second impeller 11.
Casing 12. In addition, the first casing 10
The second casing 12 and the cleaning tank 1 are provided with a cleaning water guide portion 13 that communicates with each other in three directions in the middle of both casings. Reference numeral 14 denotes the washing water guide portion 13 to the first casing 10
Is a first suction port communicating with the second casing 12, and 15 is a second suction port communicating with the second casing 12 from the wash water guide portion 13. Reference numeral 16 is a motor for driving the pump 3, which is a two-pole induction motor. Reference numeral 17 denotes a forward / reverse reversing means of the motor 16, which is a condenser for driving the motor 16 and the motor 1.
The main winding and the auxiliary winding of 6 are switched to perform forward / reverse rotation. Further, the first impeller 9 and the second impeller 11 are mounted on the output shaft of the motor 16, and both impellers rotate in the same direction.

The operation of this embodiment will be described below. First, it is assumed that the tableware is stored in the tableware basket 2 and is attached to a predetermined position of the washing tank 1 and a switch (not shown) is turned on. When the switch is turned on and the operation is started, the control device 8 first executes a water supply process of supplying a predetermined amount of cleaning water to the cleaning tank 1. Then, a main washing step is performed in which the washing water pressurized by the pump 3 is jetted together with the detergent from the jet ports 6a to 6f provided in the washing nozzle 5. After the main washing process for a predetermined time,
Next, a drainage process is started in which the cleaning water containing the dirt washed off from the dishes and the like is discharged to the outside by the pump 3. Subsequently, a water supply process of supplying fresh cleaning water, a rinsing process of spraying cleaning water from the first cleaning means for rinsing dishes contaminated with detergents and residual foods, and a draining process are consecutively performed four times. The washing process is repeated and finished.

The structure of the pump 3 and the operation in the cleaning process will be described in detail. Cleaning tank 1 and pump 3 are cleaning tank 1
From the wash water guide portion 13 connected to the water supply portion 18 (not shown) at the bottom of the tank to the first impeller 9 through the first suction port 14, and at the same time from the second suction port 15 to the second suction port 15. It is in communication with the impeller 11. Here, when the first impeller 9 rotates clockwise, and the second impeller 11 rotates counterclockwise, the cleaning water guiding portion 13 supplies the cleaning water.
The shape is set so that it can be sucked in from and discharged from, and each has a configuration called a vortex pump. In general, a vortex type pump is capable of switching the directions of discharge and suction depending on the rotation direction.

In the main washing step and the rinsing step, the washing water is guided from the first suction port 14 of the washing water guide portion 13 to the first impeller 9 by rotating the motor 16 in the clockwise direction. Here, the first impeller 9 works effectively, and the cleaning water is discharged to the cleaning nozzle 5 for cleaning. On the other hand, in this rotation direction, the second impeller 11 first discharges the cleaning water in the drainage path from the second suction port 15, but then sucks in the air in the drainage path and loses the pressurizing ability as a pump, causing idling. It becomes a state. When the second impeller 11 idles in this way, the air that is trapped inside the second casing 12 stays because there is no discharge pressure. Therefore, the air does not enter the first casing 10 and the washing water can be stably discharged to the washing nozzle.

In the drainage step, the motor 16 is rotated counterclockwise by the forward / reverse reversing means 17 so that the cleaning water is guided from the second suction port 15 of the cleaning water guide portion 13 to the second impeller 11. To be done. Here, the second impeller 11 works effectively to discharge the wash water out of the machine. On the other hand, in this rotation direction, the first impeller 9 sucks air from the injection ports 6a to 6f of the cleaning nozzle 5, loses its pressurizing ability as a pump, and idles. Since this air stays inside the first casing 10 by the same action as in the washing step, there is no noise caused by stirring the washing water while entraining air at a low water level in the conventional draining step. The air does not enter the second casing 12,
The washing water can be stably drained. However, when the water level further drops to the second impeller 11,
Although air also enters the second casing 12, the diameter of the second impeller 11 is smaller than that of the first impeller 9 and does not cause excessive noise.

As described above, in this embodiment, the first
By having the cleaning water guide portion 13 between the casing 10 and the second casing 12, the single motor 16 can perform cleaning and drainage. As a result, the volume of the cleaning mechanism occupied by the pump and the motor can be reduced, and a dishwasher with an expanded maximum size of stored dishes can be obtained.

In the present embodiment, the cleaning water guide portion 13 is connected to the cleaning tank 1 by one pipe line.
3 may be configured by two pipe lines in which the second suction port 15 and the cleaning tank 1 are connected by another pipe line.

(Embodiment 2) Next, an embodiment of the second means of the present invention will be described with reference to FIG. The basic structure of the mechanical parts is the same as the structure shown in FIG. In the figure, 21 is a first impeller, 22 is a first casing, 23 is a second impeller, 24 is a second casing, 25 is a wash water guide, and 26 is a first casing communicating with the first casing 22. And 27 is a second suction port communicating with the second casing 24. In particular, in addition to the first means, the second casing 24 of the pump 20
It has a unique effect in that it is arranged below the casing 22 of FIG.

The operation of this embodiment will be described below. The basic operation relating to the cleaning process is the same as in the first embodiment. That is, in the main washing step or the rinsing step and the draining step, the rotation direction of the motor 28 is reversed in the normal and reverse directions to discharge the washing water to the washing nozzle 5 and discharge it to the outside of the machine. Is the same as.

Particularly, in the drainage process, the wash water is guided from the second suction port 27 of the wash water guide portion 25 to the second impeller 23. Here, the second impeller 23 effectively acts to discharge the wash water out of the machine. On the other hand, the first impeller 26 includes the injection ports 6 a to 6 a of the cleaning nozzle 5.
Air is sucked in from 6f and idles. This air is used in Example 1.
By the same action as the above, it stays inside the first casing 22. Therefore, the air does not enter the second casing 24, and the wash water can be stably discharged.
Here, by disposing the second impeller 23 of the pump 20 below the first impeller 21, even if the first impeller 21 idles, the water can be drained to a lower water level.

By constructing the second casing 24 at the lowermost portion in this manner, drainage can be performed to an extremely low water level, residual water including dirt is reduced, and dirt due to new washing water is added in the next rinsing step. The dilution degree is improved and the rinsing performance is improved. Therefore, even if the number of times of rinsing and the amount of wash water used in each rinsing step are reduced, a predetermined rinsing performance can be obtained.

Moreover, in the draining process, the first impeller 21 is in a state of only completely stirring the air as the cleaning water level is lowered, and the idling noise in the first casing 20 is small. By temporarily stopping the motor 28 at this time, the cleaning water remaining in the first casing 20 can be dripped almost completely into the cleaning water guide portion 25. The idling noise inside can be easily reduced.

(Embodiment 3) Next, an embodiment of the third means of the present invention will be described with reference to FIG. The basic structure of the mechanical parts is the same as the structure shown in FIG. The pump 30 has a first impeller 32 in a first casing 31.
A centrifugal type, the second impeller 3 in the second casing 33
It has a peculiar effect in that the structure of 4 is a swirl type. Further, as shown in FIGS. 4 and 5, the first impeller 32 is arranged above the second impeller 34, and the first and second casings 31 and 33 and the cleaning tank 1 communicate with each other. It has a water guide 35. Reference numeral 36 is a first suction port communicating with the first casing 31, and 37 is a second suction port communicating with the second casing 33. 38 is a suction pipe communicating with the cleaning tank 1, 39 is a first discharge pipe from the first casing 31, and 40 is a second discharge pipe from the second casing 33.

The operation of this embodiment will be described below. The basic operation relating to the cleaning process is the same as in the first embodiment. That is, in the main washing step or the rinsing step and the draining step, the rotation direction of the motor 41 is reversed in the forward and reverse directions to discharge to the cleaning nozzle 5 and discharge to the outside of the machine, which is the same as the embodiment of the first means. is there.

Particularly, in the drainage process, at the start of the drainage process, a part of the washing water supplied from the suction pipe 38 is pressurized by the first impeller 32 in the first casing 31, and the first
Is discharged from the cleaning nozzle 5 through the discharge tube 39 of As a result, oil stains and fine residues left on the surface of the washing water are mixed again with the stirring water and are guided to the second impeller 34 in the second casing 33. , Is quickly discharged out of the machine from the second discharge pipe 40.
This is a peculiar operation of the centrifugal type of the first impeller 32, and by forcibly stirring and discharging the dirt, the dirt remaining in the cleaning tank 1 is reduced as compared with the conventional drainage method. Therefore, the redeposition is small and the rinsing performance is high. Therefore, even if the number of times of rinsing and the amount of water used are reduced, the predetermined rinsing performance can be obtained, and in this respect, it can be said that water saving can be achieved and the cleaning efficiency is high.

When the drainage process further progresses and the cleaning water level is lowered, air is sucked into the first casing 31 and the cleaning water is no longer discharged. Moreover, the first impeller 32 is in a state of only completely stirring the air as the cleaning water level is lowered, and the idling noise in the first casing 31 is reduced. Further, similarly to the second embodiment, since the second impeller 34 also drains water to a lower water level at this time,
There is little residual water. In addition, the centrifugal type can efficiently obtain the pump output required for the dishwasher, especially for the washing pump, compared to the vortex type, so it is natural that the driving motor and the washing mechanism can be downsized. is there.

[0036]

The first means of the present invention comprises a washing tank, a dish basket for storing dishes, a washing nozzle for injecting washing water, a pump for pressurizing the washing water by rotation of the motor, and a motor for the motor. A rotation shaft of the motor is provided in a substantially vertical direction, and the pump has a first casing for discharging cleaning water to a cleaning nozzle by a first impeller; and a second impeller. It is possible to reduce the size of the cleaning mechanism with a simple configuration including a second casing that discharges the cleaning water to the outside of the machine and a cleaning water guide portion that communicates with the first casing, the second casing, and the cleaning tank. It is possible to provide a dishwasher with improved dish storage.

The second means of the present invention is the second of the pump.
By arranging the casing of (1) below the first casing, the drainage can be performed to an extremely low water level, the residual water is small, and the rinsing performance is high. In particular, it is possible to provide a dishwasher that saves water.

In the third means of the present invention, the first impeller is of the centrifugal type and the second impeller is of the vortex type, so that the rinsing performance is further improved and the cleaning mechanism can be further downsized. It is possible to provide a highly efficient dishwasher.

[Brief description of drawings]

FIG. 1 is a configuration diagram of essential parts of a dishwasher according to an embodiment of a first means of the present invention.

FIG. 2 is a configuration diagram of a main part of a pump of the dishwasher in the embodiment of the second means of the present invention.

FIG. 3 is a configuration diagram of essential parts of a dishwasher in an embodiment of a third means of the present invention.

FIG. 4 is a block diagram of a main part of the pump of the dishwasher.

FIG. 5 is a plan view of a pump of the dishwasher.

FIG. 6 is a plan view of a first impeller of the dishwasher.

FIG. 7 is a plan view of a second impeller of the dishwasher.

FIG. 8 is a schematic view of a main part of a conventional dishwasher.

[Explanation of symbols]

 1 Cleaning Tank 2 Dish Basket 3 Pump 4 Heater 5 Cleaning Nozzle 9 First Impeller 11 Second Impeller 14 Motor 15 Forward / Reverse Reversing Means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Miyauchi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A washing tank, a tableware for storing tableware,
A cleaning nozzle for injecting cleaning water, a pump for pressurizing the cleaning water by rotation of the motor, and a forward / reverse reversing means for the motor are provided, and the rotation shaft of the motor is provided in a substantially vertical direction, and the pump is A first casing for discharging cleaning water to a cleaning nozzle by a first impeller mounted on the rotary shaft, and a second casing for discharging cleaning water outside the machine by a second impeller mounted on the rotary shaft. A dishwasher provided with a wash water guide part that communicates the first casing and the second casing with a washing tank through respective discharge ports. 2. The dishwasher according to claim 1, wherein the second casing is arranged below the first casing. 3. The dishwasher according to claim 1, wherein the first impeller is a centrifugal type and the second impeller is a vortex type.