JPH03155824A - Tableware washing machine - Google Patents

Abstract

PURPOSE:To improve the washing performance by providing a nozzle axis which is floated up, supported in a vertical direction with a nozzle bearing and rotated at the time of operation of a washing pump, and also, stands still on the upper face of a discharging port at the time of stopping the washing pump, on an arm nozzle, and moreover, providing plural pieces of projections on one of the lower end face of the nozzle axis and the upper face of the discharging port corresponding thereto. CONSTITUTION:As for an arm nozzle 20, a nozzle axis 30 is formed in the center part, and it is movable upward/downward in the inside of a nozzle bearing 32 fixed to a discharge port 31 of washing water. In such a state, when a washing pump 19 operates and discharging pressure is generated, the arm nozzle 20 is lifted by upward hydraulic pressure, and the nozzle bearing 32 and the nozzle axis 30 rotate, while sliding. In this regard, the clearance of the nozzle bearing 32 and the nozzle axis 30 is taken larger enough than the open hole of a filer 21, and it can be prevented that fine sand, a sesame, etc., are intruded and a rotation failure occurs. After washing is ended, the arm nozzle 20 stands still by plural pieces of projections 33 of the lower end face of the nozzle axis 30 on the upper face of the discharging port 31, therefore, even if it is left in a state that contamination of high viscosity adheres thereto, it does not occur that the arm nozzle 20 is fixed to the discharge port 31 and the rotation failure is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dishwasher that washes dishes by spraying washing water, and is particularly characterized by a support structure for an arm nozzle as a washing means.

2. Description of the Related Art A conventional method of operating a dishwasher of this type will be described with reference to FIG.

After storing the dishes in a predetermined place in the dish basket 1 and placing them in the washing tank 2, when detergent is added and operation is started, a predetermined amount of washing water is supplied to the washing tank 2 by the operation of the water supply valve 3. There is a water supply step, followed by a washing step in which wash water pressurized by the washing pump 4 is injected together with detergent from an injection port provided in the arm nozzle 5. In this washing step, electricity is supplied to the heater 6 provided in the washing tank 2 to heat the washing water and the tableware to a predetermined temperature. After passing through the washing process for a predetermined period of time, a drainage process begins in which the washing water containing the dirt washed off from the dishes is drained by the drainage pump 7. Next, the water supply process of newly supplying washing water and the washing water to the arm nozzle 5.
A rinsing process is used to rinse dishes soiled with detergent or leftover food (food that has adhered to the tableware as dirt is called leftover food) by spraying water from the machine, and a drainage process is used to discharge the washing water outside the machine. This is repeated four times in succession to complete the cleaning, and the leftover food is collected in the filter 8 provided at the bottom of the cleaning tank.

In particular, the final rinsing step is called a heating rinsing step, in which the heater 6 is energized to heat the washing water and tableware to a predetermined temperature. Next, a drying process is started, in which the heater 6 is energized and the blower 9 is used to exhaust the humid air inside the refrigerator.

Problems to be Solved by the Invention However, in conventional dishwashers, the dishwashing means does not spray washing water, but instead uses an arm nozzle 5 that rotates approximately horizontally.
It is. As shown in FIG. 5, this arm nozzle 5 has a nozzle shaft 11 formed in the center, and a cleaning water discharge port 1.
It can move up and down inside a nozzle bearing 13 fixed to 2. When the cleaning pump 4 operates and discharge pressure is generated, the arm nozzle 5 rises due to the upward water pressure, and the nozzle bearing 13 and the nozzle shaft 11 rotate while sliding, and the cleaning pump 4 stops. When this occurs, the entire °r arm nozzle descends and the nozzle shaft 11 comes to rest on the upper surface of the discharge port 12. However, if the nozzle shaft 11 of the arm nozzle 5 is left with highly sticky dirt attached to it, it becomes stuck to the discharge port 12 and rotates poorly, resulting in poor cleaning. To solve this problem, an arm nozzle 14 as shown in FIG. 6 has conventionally been used, but in this case, a nozzle bearing 15 that supports the rotation of the arm nozzle 14 is used.
The lower surface of the arm nozzle 14 slides and rotates, and the upper nut 16 and the arm nozzle 14 are connected to each other in order to prevent rotation failure due to thermal deformation of the arm nozzle 14 or fine sand, sesame seeds, etc.
A predetermined gap 17 is provided between the two. For this,
This causes a leakage flow rate of cleaning water, that is, a loss, and requires excessive pumping capacity.

Furthermore, as shown in FIG. 5, if the diameter of the nozzle shaft 11 is increased, the pressure of the nozzle shaft 11 against the nozzle bearing 13 due to the discharge pressure becomes excessive, and the resistance at the sliding part to the rotation of the arm nozzle 14 increases. The diameter of the support portion of the arm nozzle 5 is limited to a small diameter because the diameter of the support portion of the arm nozzle 5 is limited to a small diameter because the diameter of the support portion of the arm nozzle 5 is limited to a small diameter. Therefore, it is difficult to stably hold the arm nozzle 5 in a horizontal state, and the vertical fluctuation of the tip position of the arm nozzle 5 at the start of rotation is large, and the inclination of the entire arm nozzle 5 when the rotation is stopped is also large. There is a risk of excessive temperature rise during the drying process, etc. Therefore, it is necessary to provide a large distance between the heater 6 and the arm nozzle 5, and a certain distance is required between the arm nozzle 5 and the dish basket 1 to ensure cleaning performance, so it is determined based on the dimensional relationship in the height direction. This poses a problem in that the size of tableware that can be stored in the washing tank 2 is limited, making it difficult to use.

On the other hand, when the distance between the heater 6 and the arm nozzle 5 is made small, the energization time of the heater 6 is limited to a short time in order to avoid the above problem, resulting in a problem that the drying performance is low.

In view of the above problems, the first object of the present invention is to improve the washing performance by improving the arm nozzle support structure and increasing the reliability of arm nozzle rotation. The second purpose is to improve the reliability of the arm nozzle rotation as well as the ability to maintain the horizontal state when the arm nozzle starts and stops rotating.

Means for Solving the Problems In order to achieve the above first object, the present invention provides a cleaning tank;
A washing pump that pressurizes washing water, a dish basket that stores dishes, an arm nozzle having an opening that sprays washing water, a discharge port that supplies washing water to the arm nozzle, and an axis that rotates the arm nozzle. Equipped with a nozzle bearing to support the
The arm nozzle is provided with a nozzle shaft that floats up when the cleaning pump is in operation and rotates while being vertically supported by the nozzle bearing, and that rests on the upper surface of the discharge port when the cleaning pump is stopped. A plurality of protrusions are provided on either the upper surface of the discharge port or the upper surface of the corresponding discharge port.

In order to achieve the second object, the present invention provides a washing tank, a washing pump that pressurizes washing water, a dish basket that stores dishes, an arm nozzle having an opening that sprays washing water, comprising a discharge port that supplies cleaning water to the arm nozzle, and a nozzle bearing that pivotally supports rotation of the arm nozzle,
The arm nozzle is provided with a nozzle shaft that floats when the cleaning pump is in operation and rotates while being vertically supported by the nozzle bearing, and the cleaning pump is stopped either on the upper surface of the nozzle bearing or on the lower surface of the corresponding arm nozzle. A plurality of protrusions are provided to keep the arm nozzle stationary at times.

Function: With the above structure of the dishwasher of the present invention, the arm nozzle and nozzle shaft float while the washing pump is in operation and are supported in the vertical direction by the nozzle bearing while rotating, and the gap between the bearing portion is made larger than the filter opening. By making it large, you can prevent fine sand, sesame seeds, etc. from getting in and causing rotation failure.

Furthermore, when the cleaning pump is stopped, the plurality of protrusions prevent the nozzle shaft from sticking to the discharge port and causing malfunction of the arm nozzle even if the cleaning pump is left with highly sticky dirt attached.

In addition, the arm nozzle and nozzle shaft are configured with multiple protrusions that float up when the cleaning pump is in operation, are vertically supported by the nozzle bearing, and rotate, and that keep the arm nozzle stationary when the cleaning pump is stopped. By optimizing the gap between the parts, the above-mentioned reliability of arm nozzle rotation can be obtained, and at the same time, by increasing the spacing between the protrusions that support the arm nozzle, it is possible to maintain the arm nozzle in a horizontal state when it starts and stops rotating. Ability is enhanced. In particular, by configuring the protrusion that supports the arm nozzle to be provided outside the washing water flow path, it is possible to easily visually check whether there is highly sticky dirt or the like attached to the support state of the arm nozzle.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

FIG. 1 is a cross-sectional view of the main parts showing the configuration of the dishwasher in the first embodiment, in which 18 is a washing tank, 19 is a washing pump,
20 is an arm nozzle equipped with an injection port for spraying pressurized washing water from the washing pump 13, 21 is a filter for collecting leftover food, and 22 is a tableware basket for storing dishes in the washing tank 18. 23 is a heater that heats the washing water and tableware; 24 is a drain pump that discharges the washing water to the outside of the machine;
5 blows air from the intake port 26 into the cleaning tank 18 and exhaust port 2
7 is a blower for discharging air, 28 is a water supply valve that supplies washing water, and 29 is a control device that controls the operation of the washing pump 19, drain pump 24, etc.

Further, as shown in FIG. 2, the arm nozzle 20 has a nozzle shaft 30 formed in the center thereof, and is movable up and down within a nozzle bearing 32 fixed to a cleaning water discharge port 31. When the cleaning pump 19 operates and discharge pressure is generated, the arm nozzle 20 rises due to the upward water pressure, and the nozzle bearing 32 and the nozzle shaft 30 rotate while sliding, and the cleaning pump 19 stops. When this occurs, the entire arm nozzle 20 descends and is configured to rest on the upper surface of the discharge port 31 by means of a plurality of substantially hemispherical protrusions 33 on the lower end surface of the nozzle shaft 30.

The operation of the above configuration will be explained below. Add a predetermined amount of detergent and place the dishes in the dish basket 22 in the washing tank 18.
Store it in the compartment and start driving. First, when washing water is supplied by energizing the water supply valve 28, a washing process is performed in which washing water containing detergent is pressurized by the washing pump 19 and sprayed from the arm nozzle 20, and dirt adhering to the dishes is washed off. It will be done. In this process, the cleaning water containing dirt is filtered to the filter 2.
1, the water is sent to the cleaning pump 19, and then sprayed again from the arm nozzle 20, which is repeated. Also,
In this washing step, electricity is supplied to the heater 23 provided in the washing tank 18 to heat the washing water and the tableware to a predetermined temperature. After the washing process for a predetermined period of time, a drainage process is performed to drain the dirty washing water, and the washing water in the washing tank 18 is filtered by a filter 21 and sent to a drainage pump 24 to be discharged outside the machine. be done. Subsequently, there is a water supply process in which new washing water is supplied, a rinsing process in which washing water is sprayed from the arm nozzle 20 to rinse dishes soiled with detergent or leftover food, and a drainage process in which washing water is discharged outside the machine. The process is repeated four times in succession to complete the washing, and the leftover food is collected in the filter 21.

Particularly in the final rinsing step, heat is applied to complete the cleaning step. The gap between the nozzle bearing 32 and the nozzle shaft 3° is made sufficiently larger than the opening of the filter 21 to prevent fine sand, sesame seeds, etc. from entering and causing rotation failure.

After cleaning, the arm nozzle 20 is configured to rest on the upper surface of the discharge port 31 by a plurality of protrusions 33 on the lower end surface of the nozzle shaft 30. Unlike the case where the arm nozzles 20 are in close contact with each other, there is no possibility that the arm nozzle 20 will stick to the discharge port 31 and cause rotation failure.

Although the protrusion 33 is provided on the lower surface of the nozzle shaft 30, it may be provided on the upper surface of the discharge port 31. Further, in this embodiment, the protrusion 33 is formed into a substantially hemispherical shape, but it may also have a rib structure with a convex tip.

Next, a second embodiment of the present invention will be described.

FIG. 3 is a cross-sectional view of the main parts showing the configuration of the arm nozzle of a dishwasher according to the second embodiment of the present invention, and the configuration of other mechanical parts is similar to that of the first embodiment. The explanation is omitted because it is shared. In the figure, reference numeral 34 denotes an arm nozzle, which has a nozzle shaft 35 formed in its center, and a nozzle bearing 3 fixed to a cleaning water outlet 36.
It is movable up and down inside 7. When the cleaning pump operates and discharge pressure is generated, the arm nozzle 34 rises due to the upward water pressure, and the nozzle bearing 37 and nozzle shaft 35 rotate while sliding, until the cleaning pump stops. Sometimes the entire arm nozzle 34 descends,
A plurality of substantially hemispherical protrusions 38 on the upper surface of the nozzle bearing 37
It is configured to rest on top. Here, the arrangement interval of the protrusions 38 is made large enough to be equal to the outer diameter of the nozzle bearing 37, and the cross-sectional shape of the arm nozzle 34 is such that the protrusions 38 are placed on the lower surface of the arm nozzle 34 around the nozzle shaft 35. Ensure that there is enough flat surface to allow it to stand still horizontally. Note that the basic operation of the cleaning process is the same as that of the first embodiment, so a description thereof will be omitted.

In this cleaning step, by configuring the gap between the bearing parts to an optimum value, reliability of the rotation of the arm nozzle 34 can be obtained as in the first embodiment, and at the same time, the arrangement interval of the protrusions 38 that support the arm nozzle 34 can be adjusted. By increasing the size, arm nozzle 3
4. The ability to maintain the horizontal state when starting and stopping the rotation is enhanced. That is, since the distance between the arm nozzle 34 and the heater 23 is always maintained, it is possible to prevent the risk of excessive temperature rise of the arm nozzle 34, and it is possible to simultaneously set the air volume of the blower and the energization rate of the heater to be high. It becomes possible to maintain the temperature of the tableware at a high temperature, and the drying performance can be improved. In particular, by configuring the protrusion 38 that supports the arm nozzle 34 to be provided outside the washing water flow path, it is possible to easily visually check whether highly sticky dirt or the like has adhered to the support state of the arm nozzle 34.

Although the protrusion 38 is provided on the upper surface of the nozzle bearing 37, it may be provided on the lower surface of the arm nozzle 34. Further, in this embodiment, the protrusion 38 is formed into a substantially hemispherical shape, but
As in the first embodiment, the tip may have a rib structure with a convex tip.

Effects of the Invention As described above, the present invention includes a discharge port for supplying washing water to the arm nozzle and a nozzle bearing that supports rotation of the arm nozzle as a support structure for the arm nozzle, and a washing pump operation for the arm nozzle. A nozzle shaft is provided that sometimes floats up and rotates while being vertically supported by a nozzle bearing, and that rests on the top surface of the discharge port when the cleaning pump is stopped. A plurality of protrusions are provided on either of the nozzle bearings, and a plurality of protrusions are provided on either the upper surface of the nozzle bearing and the corresponding lower surface of the arm nozzle for stopping the arm nozzle when the cleaning pump is stopped. It is possible to provide a dishwasher with high cleaning performance that does not cause the arm nozzle to stick to the bearing and cause rotation failure even if the dishwasher is left with highly sticky dirt attached after cleaning is completed. .

Further, the present invention provides a nozzle shaft that floats up during operation of the cleaning pump and rotates while being supported in the vertical direction by the nozzle bearing, and that the upper surface of the nozzle bearing and the lower surface of the arm nozzle corresponding thereto are provided in the arm nozzle. Providing a plurality of protrusions that keep the arm nozzle stationary when the cleaning pump is stopped improves the reliability of the arm nozzle rotation, while increasing the spacing between the protrusions that support the arm nozzle. It has a high ability to maintain a horizontal state when starting and stopping rotation, and has a high heater energization rate and a high heating temperature for dishes (it is possible to provide a dishwasher with excellent drying performance.Especially for the arm nozzle. By configuring the supporting protrusion to be provided outside the washing water flow path,
Regarding the state of support of the arm nozzle, it is possible to easily visually confirm whether there is highly sticky dirt or the like.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of main parts of a dishwasher according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the configuration of an arm nozzle of a dishwasher according to the first embodiment, and FIG. Embodiment 2 is a cross-sectional view showing the configuration of the arm nozzle of the dishwasher, FIG. 4 is a cross-sectional view of main parts of the conventional dishwasher, and FIG. 5 is a cross-sectional view showing the configuration of the arm nozzle of the conventional dishwasher. figure,
FIG. 6 is a sectional view showing the configuration of another arm nozzle of a conventional dishwasher. 18...Cleaning tank, 19...Cleaning pump, 20...
Arm nozzle, 22...Dish basket, 33.38...
protrusion.

Claims (2)

[Claims] (1) a washing tank, a washing pump that pressurizes washing water, a tableware basket that stores dishes, an arm nozzle having an opening that sprays washing water, and a discharge port that supplies washing water to the arm nozzle; and a nozzle bearing that pivotally supports rotation of the arm nozzle, the arm nozzle floats on the arm nozzle when the cleaning pump is in operation, is vertically supported by the nozzle bearing and rotates, and remains stationary on the upper surface of the discharge port when the cleaning pump is stopped. What is claimed is: 1. A dishwasher comprising: a nozzle shaft; and a plurality of protrusions on either the lower end surface of the nozzle shaft or the upper surface of the corresponding discharge port. (2) a washing tank, a washing pump that pressurizes washing water, a dish basket that stores dishes, an arm nozzle having an opening that sprays washing water, and a discharge port that supplies washing water to the arm nozzle; a nozzle bearing that pivotally supports the rotation of the arm nozzle; the arm nozzle is provided with a nozzle shaft that floats during operation of the cleaning pump and rotates while being vertically supported by the nozzle bearing; and a dishwasher provided with a plurality of protrusions on one of the lower surfaces of the corresponding arm nozzle for stopping the arm nozzle when the washing pump is stopped.