JP2669080B2 - Dishwasher - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing and drying dishes by spraying washing water, and particularly characterized by the arrangement of arm nozzles and heaters as washing means. Is.

2. Description of the Related Art Conventionally, the present inventors have proposed (pending application) a dishwasher of this type as shown in FIG. The contents will be described below.

After storing the dishes in a predetermined place of the table basket composed of the upper basket 1 and the lower basket 2 and arranging them in the cleaning tank 3, when the detergent is put in and the operation is started, first, the predetermined amount of water is supplied by the operation of the water supply valve. There is a water supply step of supplying the cleaning water to the cleaning tank 3, and then a main cleaning step of cleaning the cleaning water pressurized by the cleaning pump 4 together with the detergent through the injection ports provided in the rod-shaped nozzle 5 and the arm nozzle 6. Is done. In this main washing step, the heater 7 provided in the washing tank 3 is energized to heat the washing water and the dishes to a predetermined temperature. After the main washing process for a predetermined time, the process enters a draining process in which washing water containing dirt washed off from tableware is drained by the drain pump 8. Continued
By a new water supply process of supplying washing water, and by spraying the washing water from the rod-shaped nozzle 5 and the arm nozzle 6, it can be used as a detergent or a leftover food (food left on the dishes as dirt is called a leftover food). The rinsing process for rinsing dirty dishes and the draining process for discharging the cleaning water to the outside of the machine are repeated four times in succession to complete the cleaning, and the leftover food is in the filter 9 provided at the bottom of the cleaning tank 3. To be collected by. In particular, the final rinsing step is called a heating rinsing step, in which the heater 7 is energized to heat the washing water and the dishes to a predetermined temperature. Subsequently, in the drying step, the heater 7 is energized, and the tableware is heated by the blower 11 from the air inlet 11a to maintain the tableware in a high temperature state.
Drying was performed by discharging the humid air inside from the exhaust port 11b.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the dishwasher, the dishwashing means is the rod-shaped nozzle 5 and the arm nozzle 6, and the arm nozzle 6 is used to obtain the washing performance of the entire lower basket 2 including the corner portion.
Has to be approximately equal to the outer dimensions of the lower car 2. On the other hand, the heater 7 is formed in a substantially rectangular shape in consideration of the heat distribution in the drying process and the operability of the filter 9 for collecting the residual foods, and the rotation locus of the arm nozzle 6 is the heater 7.
It is large before passing through the upper part of the heater 7, and both ends of the arm nozzle 6 may stop at the upper part of the heater 7 when the cleaning pump 4 is stopped. Therefore, in the drying process, it is necessary to limit the energization time of the heater 7 in order to suppress the temperature rise of the arm nozzle 6 which is a resin molded product. Heater 7
Since the one with a large heat generation capacity is used to heat the dishes with the washing water in the washing step, the heater 7 alternately repeats energization and de-energization in the drying step, but if the energization time is short, the temperature of the dishes is sufficient. Since the temperature does not rise, the drying performance is low and it takes time to dry. As a countermeasure against this, it is necessary to increase the space distance between the heater 7 and the arm nozzle 6, and the distance between the arm nozzle 6 and the lower basket 2 needs to be a certain distance in order to ensure cleaning performance. Judging from the relationship, there is a problem that the size of the tableware that can be stored in the cleaning tank 3 is limited and the usability becomes poor.

Furthermore, in order to ensure the specified drying performance, the blower 10
Therefore, even though it is necessary to blow the air from the intake port 11a toward the heater 7 with a uniform and sufficient amount of air and at the same time prolong the energization time of the heater 7, the stop position of the arm nozzle 6 in the above dishwasher is increased. In some cases, the arm nozzle 6 acts as a barrier, and the air blowing condition fluctuates and becomes non-uniform.
There is a risk that the arm nozzle 6, the heater 7, etc. will overheat. In order to avoid this, there is also a problem that the energizing time of the heater 7 is limited to a short time and the drying performance is low.

SUMMARY OF THE INVENTION In view of the above problems, it is a first object of the present invention to improve washing and drying means, to secure both washing and drying performance, and at the same time to increase the storage capacity of tableware and the like. The second purpose is to improve the drying performance with a simple and low-cost structure.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cleaning tank, a tableware basket for storing tableware in the cleaning tank, a cleaning means having an injection port for spraying cleaning water, and A heater for heating washing water and tableware at the bottom of the washing tank, wherein the washing means comprises:
A configuration in which an arm nozzle that rotates substantially horizontally at the bottom of the cleaning tank and has a locus of rotation that does not overlap with the heater is located above the heater in the cleaning step and below the heater in the drying step. It was done.

With the above-described configuration of the dishwasher of the present invention, the arm nozzle is positioned higher than the heater in the cleaning step and is positioned lower in the drying step, so that the distance between the arm nozzle and the tableware is increased in the cleaning step. In the drying process, regardless of the stop position of the arm nozzle, a sufficient amount of air can be uniformly blown from the blower to the heater, making it possible to lengthen the energization time of the heater. Since it can be reliably held at, it is possible to always ensure high drying performance.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1 showing an embodiment of the present invention, 12 is a washing tank, 13 is a washing pump, and 26 and 27 are washing means provided with an injection port of washing water pressurized by the washing pump 13.
It comprises a rod-shaped nozzle formed in the longitudinal direction of the washing tank 12 and a plurality of arm nozzles 27 which rotate substantially horizontally in a fixed part of the washing tank 12. In order to rotate the rod-shaped nozzle 26, a propulsion nozzle 26a provided with an injection port by extending the washing water flow path is provided at one end thereof. Reference numeral 16 denotes a filter for collecting residual vegetables. Reference numerals 17 and 18 denote tableware baskets for storing dishes in the cleaning tank 12, which are called an upper basket and a lower basket, respectively. Reference numeral 28 denotes a heater for heating the washing water and tableware, and has a rectangular shape similar to that of the washing tank 12 and is provided at a lower portion. 20 is a water supply valve for supplying washing water, 21 is a drain pump for discharging washing water outside the machine, 22
Is a blower that blows air from the intake port 23 into the cleaning tank 12 and exhausts it from the exhaust port 24, and 25 is a control device that controls the operation of the cleaning pump 13, the drain pump 21, and the like.

Further, as shown in FIG. 3, the arm nozzle 27 forms a nozzle shaft 29 fixed in the central portion, and is movable up and down inside a nozzle bearing 31 fixed to the cleaning water discharge port 30. Has become. When the cleaning pump operates in the cleaning process and discharge pressure is generated, the arm nozzle 27 rises due to upward water pressure, and the nozzle bearing 31 and the nozzle shaft 29 rotate while sliding, and the cleaning pump 13 stops. Then, the entire arm nozzle 27 descends until the nozzle shaft 29 stops at the upper surface of the discharge port 30. Here, when the arm nozzle 27 rises, the distance between the tableware basket and the ejection port on the upper surface of the arm nozzle is set to an optimum distance from the viewpoint of cleaning performance, and the arm nozzle 27
Is formed such that the upper surface of the arm nozzle 27 is located lower than the heater 28 when the arm is lowered.

The operation of the above configuration will be described below. A predetermined amount of detergent is charged, the dishes are stored in the upper car 17 and the lower car 18 in the cleaning tank 12, and the operation is started. First, when the wash water is supplied by energizing the water supply valve 20, the wash pump 13 pressurizes the wash water containing the detergent and jets it from the rod-shaped nozzle 26 and the arm nozzle 27 to perform a main washing step, Dirt adhering to the dishes is washed off. Cleaning water containing dirt
While being filtered by the filter 16, it is sent to the washing pump 13 and repeatedly ejected from the rod-shaped nozzle 26 and the arm nozzle 27. In the main washing step, the heater 28 provided in the washing tank 12 is energized to heat the washing water and dishes to a predetermined temperature. After the main washing process for a predetermined time, a draining process for draining dirty cleaning water is performed next, and the cleaning water in the cleaning tank 12 is filtered by the filter 16 and sent to the drainage pump 21 to be discharged outside the machine. To be done. Subsequently, a water supply step for newly supplying washing water, a rinsing step for rinsing dishes and the like contaminated with detergent and leftovers by spraying the washing water from the rod nozzle 26 and the arm nozzle 27, and the washing water The washing process is completed by repeating the drainage process of discharging the product outside the machine four times in succession, and the appetizer is collected in the filter 16. In particular, the final rinsing step is heated to finish the washing step. Next, enter the drying process, and alternately repeat energization and non-energization of the heater 28,
The tableware is heated by the air blown from the air inlet 23 by the air blower 22 to keep the tableware at a high temperature, and at the same time, the moist air in the cleaning tank 12 is discharged from the air outlet 24 to perform drying.

In the present embodiment, in the above-mentioned washing process, the dishes of the lower basket 18 are washed mainly by spraying from the arm nozzle 27, but as shown in FIG. 2, the rotation locus of the arm nozzle 27 is a rectangular shape of the heater 28. Within the range.

In the drying process of the present embodiment, since the stop position of the arm nozzle 27 is located not on the heater 28 but on the side, the temperature rise of the arm nozzle 27 is small unlike the conventional example. Can be made longer than conventional ones. In particular, the upper surface of the arm nozzle 27 is
Since it is located at the lower position of the arm nozzle 27, within the range of the rotation trajectory of the arm nozzle 27, a uniform and sufficient amount of air flows from the rear part to the front part in the cleaning tank 12 from the blower 22 to the heater 28 regardless of the stop position. Since the air can be blown in, the tableware can be efficiently heated in a short time, and a high drying performance can always be secured.

In addition, since the rotation trajectory of the arm nozzle 15 does not pass through the upper portion of the heater 19, it is possible to dispose the arm nozzle 15 closer to the bottom portion of the cleaning tank 12 than in the conventional case. Therefore, the bottom of the tableware basket can be configured to be lower in the cleaning tank 12 than in the conventional case, so that the cleaning tank 12 having the same size can store the tableware having a larger diameter than in the conventional case.

In this embodiment, the rod-shaped nozzle 14 uses the reaction force of the washing water jetted from the jet nozzle of the propulsion nozzle as the propulsive force.
Cleaning water is sprayed on the dishes of the upper car 17 and the lower car 18 while rotating around the axis of 14, and the cleaning performance especially at the corners of the lower car 18 is the bar nozzle 14 and the arm nozzle. It is secured by flush water injection from both of the 15

Further, the present invention is also applicable to the cleaning / drying means, particularly to a rectangular cross section having a large difference in the width and depth of the cleaning tank, for example, a width of 25 cm and a depth of 50 cm, and conversely a width of 50 cm and a depth of 25 cm. Needless to say, it is possible to obtain excellent washing performance and drying performance, and it is possible to constitute various types of dishwashers that are easy to use.

EFFECTS OF THE INVENTION As described above, the present invention comprises an arm nozzle that rotates substantially horizontally at the bottom of the cleaning tank and has a rotation locus that does not overlap with the heater, and the arm nozzle is positioned above the heater in the cleaning process. , The lower position in the drying process optimizes the distance between the arm nozzle and the dishes in the cleaning process, and in the drying process, it is even from the blower to the heater regardless of the stop position of the arm nozzle. An object of the present invention is to provide a dishwasher capable of supplying a sufficient amount of air and extending the energization time of the heater, and constantly ensuring high drying performance.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a dishwasher according to an embodiment of the present invention, FIG. 2 is a plan sectional view showing a rotation locus of an arm nozzle of the dishwasher according to this embodiment, and FIG. Sectional drawing which shows the support structure of the arm nozzle of a dishwasher,
FIG. 4 is a sectional view of essential parts of the dishwasher proposed so far. 12 ... cleaning tank, 13 ... cleaning pump, 26 ... rod-shaped nozzle,
27 …… Arm nozzle, 17 …… Top basket, 18 …… Bottom basket, 28
……heater.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yu Taniguchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-231615 (JP, A)

Claims (1)

(57) [Claims] 1. A washing tank, a dish basket for storing dishes in the washing tank, a washing means having an injection port for injecting washing water, and a heater for heating the washing water and the dishes at the bottom of the washing tank. The cleaning means comprises an arm nozzle that rotates substantially horizontally at the bottom of the cleaning tank and has a rotation locus that does not overlap with the heater, and the arm nozzle is positioned higher than the heater in the cleaning step, and in the drying step. Dishwasher located below.