JPH10225420A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be excellent in operability at the time of taking dishes into and out of a lower basket and to improve the washing effect of the dishes set in an upper basket and the lower basket. SOLUTION: This dishwasher washes dishes by supplying pressurized water from a circulation pump 13 for an arm nozzle 15 by way of an arm nozzle 17 and a conducting tube 18 added to the lower basket by being away with the nozzle 17 to eject washing water from the holes of the nozzles 15 and 17. In the dishwasher, the nozzle 15 ejecting washing water to the dishes set in the upper basket is installed at the lower part of the upper basket independent from the tube 18 and a flowing route restricting wall nearly in the form of a circle on a side outer that the inner diameter dimension of a neck part at an inner surface part in the form of an umbrella at the washing water flow-in port of the nozzle 15 to form a plurality of recessed water passages toward an outer periphery from this.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art In washing dishes using a dishwasher, a washing water jetting method using a rotating arm nozzle method is generally used because of its high washing efficiency.

[0003] Dishwashers for 5 to 6 people are usually of a two-stage type consisting of an upper basket and a lower basket, and arm nozzles are also installed for the upper basket and the lower basket.

In order to store dishes, both upper and lower baskets are generally pulled out of the dishwasher body.

Here, the basic structure of the dishwasher will be described below. Pressurized water from a circulation pump is distributed and supplied to a lower arm nozzle and an upper arm nozzle by a distribution function of a nozzle shaft. And, conventionally, as a specific configuration for supplying pressurized water to the upper arm nozzle separately from the supply of pressurized water to the lower arm nozzle, a cleaning water supply hose is passed through the outside of the cleaning tank, and a nozzle tower is connected to the tip of the hose. An upper arm nozzle is connected to the tip of the nozzle tower.

However, according to this configuration, since each circulation path (main path) is different, not only the structure becomes complicated, but also a space for passing the cleaning water supply hose outside the cleaning tank is required. As a result, the size of the product increases, and it is necessary to take measures to prevent leakage of the cleaning water supply hose outside the cleaning tank.

On the other hand, there has been proposed a dishwasher in which all the problems of the prior art have been solved, for example, Japanese Patent Application Laid-Open No. 6-46985.

The structure is roughly as follows.

In other words, a circulation pump unit is installed substantially at the center of the outer bottom surface of the washing tank, and the washing water discharge port at the bottom of the washing tank has a distribution function of supplying washing water to the lower arm nozzle and the upper arm nozzle. Are connected to each other.

The lower arm nozzle is rotatably mounted on the nozzle shaft.

The upper arm nozzle is rotatably mounted on an upper part of a Venturi tube-shaped water pipe fixed to a substantially central portion of the lower cage, spaced apart from the lower arm nozzle.

The pressurized water from the circulation pump is sent to a lower arm nozzle and a lower inlet of a water pipe provided separately from the lower arm nozzle by a nozzle shaft distribution function, and further from an upper outlet of the water pipe to an upper arm nozzle. Of the lower arm nozzle and the upper arm nozzle, and at the same time, the lower arm nozzle and the upper arm nozzle start to rotate due to the reaction force of the injection.

[0013] The structure and operation of the improved dishwasher having the upper arm nozzle and a water pipe provided above and separated from the lower arm nozzle are as described above.
Since the main path of the washing water sent to the lower arm nozzle and the washing water sent to the upper arm nozzle is the same, not only the structure is simplified, but also the space for passing the washing water supply hose outside the washing tank is provided. This eliminates the necessity, and the product can be downsized accordingly, so that there is no need to take measures to prevent water leakage from the cleaning water supply hose outside the cleaning tank.

[0014]

However, according to the improved dishwasher, the upper arm nozzle is attached to the upper part of the water pipe installed substantially at the center of the lower basket. The upper arm nozzle that protrudes in the horizontal direction every time you take in and out, is inferior in operability,
When this happens every day, the annoyance cannot be ignored.

Japanese Patent Application Laid-Open No. 50-32774 discloses a technique for mounting an upper arm nozzle on the ceiling of a washing tank. According to this technique, a water pipe installed at a substantially central portion of a lower basket is disclosed. Since the upper arm nozzle does not exist in the upper part, the upper arm nozzle does not become a hindrance when the tableware is taken in and out of the lower basket, and is excellent in operability.

However, when the upper arm nozzle is attached to the ceiling of the washing tank, the jet jet jetted from the upper arm nozzle installed on the ceiling exerts the washing action only from the upper side of the tableware set in the upper basket. Therefore, it is necessary to increase the output of the washing water circulation pump in order to increase the washing effect of the dishes set in the upper basket, which increases the power consumption and is disadvantageous in terms of economy.

According to the present invention, since the main path of the washing water sent to the lower arm nozzle and the washing water sent to the upper arm nozzle are the same, the structure is simple, and the space for passing the washing water supply hose outside the washing tank is provided. The dishwasher, which can reduce the size of the product and eliminates the need to prevent leakage of the washing water supply hose outside the washing tank, that is, separates from the lower arm nozzle, A dishwasher with a water pipe that supplies washing water to the upper arm nozzle was further improved, and its purpose was to provide excellent operability when putting dishes in and out of the lower basket. The washing effect of the set tableware can be increased without increasing the output of the washing water circulation pump, that is, without increasing the power consumption. It is to provide a dishwasher which can simultaneously achieve the effect of enhancing the cleaning effect of utensils rely effectively clean water to the set dishes under basket leakage water from the mouth.

[0018]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a method for supplying pressurized water from a circulating pump to a lower arm nozzle and an upper arm nozzle via a water pipe attached to a lower cage away from the upper arm nozzle. In a dishwasher for washing dishes by injecting washing water from small holes in upper and lower arm nozzles, an upper arm nozzle for ejecting washing water to dishes set in an upper basket is independent of a water pipe. It is installed at the lower part of the upper basket, and a flow path restriction wall is provided on the inner surface of the washing water inlet of the upper arm nozzle.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional side view of the entire internal structure showing an embodiment of a dishwasher according to the present invention, and FIG. 2 is a view showing a positional relationship between upper and lower arm nozzles 15 and 17 and a water pipe 18. 1 is a partial sectional view, FIG. 3 is a longitudinal sectional view showing a modification of the upper arm nozzle 15, FIG. 4 is a bottom view of FIG. 3, and FIG. 5 is an explanatory view comparing the sections of the water passages of FIG. Things. In FIG. 1, a dishwasher main body 1 has a door 3 on the front face that opens forward as indicated by an arrow with the hinge 2 as a center of rotation.

The door 3 includes "washing", "rinsing", and "drying" such as water supply, heating, hot water circulation, drainage, and air blowing of the dishwasher.
A controller 4 for controlling the cycle operation of the dishwasher is provided inside, and on the upper part of the door 3, a progress indicator of the dishwasher, a display 5 for performing various displays instructed by the controller 4, and a driving operation unit (not shown) Is installed. Door 3
A door inner wall 6 made of a stainless steel material is attached to the inner surface of the, and a detergent dispenser and a finish dispenser (both not shown) are installed on the door inner wall 6.

Like the inner wall 6 of the door, a washing tank and a drying tank (hereinafter referred to as a washing tank) 7 made of stainless steel are configured so that when the door 3 is closed, the packing 8 keeps airtight with the outside. Have been.

The washing tank 7 has an upper rail 9 and a lower rail 10.
Is provided so that the upper car 11 and the lower car 12 can move to the front of the main body 1 via the upper rail 9 and the lower rail 10, respectively.

A circulating pump unit 13 is installed substantially at the center of the outer bottom surface of the washing tank 7, and the lower arm nozzle 17 and the upper arm nozzle 15 are provided at the washing water discharge port at the bottom of the washing tank 7. A nozzle shaft 14 having a distribution function of supplying water is connected. Further, the circulation pump unit 13
Arm nozzle 17 having a plurality of washing water injection holes 17a for receiving the supply of washing water from the nozzle, and having a washing water ejection port 16 for guiding water to the upper arm nozzle 15 substantially at the center.
Is rotatably attached to the nozzle shaft 14 at a position below the lower car 12.

At a substantially central portion of the lower basket 12, a water pipe 18 is provided above the washing water jet 16 and spaced apart from the washing water jet 16.

As shown in FIG. 2, the water conduit 18 has a lower cross-section at the center 18a in the height direction.
b and the flow passage cross-sectional area of the upper outlet 18c. An upper arm nozzle 15 is rotatably attached to a lower central portion of the upper car 11 independently of the water pipe 18.

At the lower part of the upper arm nozzle 15, a cleaning water inlet 15 b having a widened frontage is located apart from the upper part 18 c of the water pipe 18. The channel cross-sectional area of the throat portion 15c provided between the wash water inlet 15b of the upper arm nozzle 15 and the plurality of wash water injection holes 15a is such that the upper arm nozzle reaches the plurality of wash water injection holes 15a. 15 is smaller than the cross-sectional area of the flow path. As shown in FIGS. 4 and 5,
The umbrella-shaped inner surface of the washing water inlet 15b has a throat 15c.
A substantially circular flow path restricting wall 27 is formed outside the inner diameter dimension of. A plurality of branch walls 27a,
Concave water passages 28a, 28b, 28c are formed toward the outer periphery of the umbrella-shaped inner surface by 27b, 27c and the like.
The water passages 28a, 28b, 28c are provided at angles of θ ₁ , θ ₂ , θ ₃ with respect to the vertical axis, respectively.

A heater unit 20 is fixed from outside the tank 7 to a spherical portion 19 formed below the cleaning tank 7 so as to protrude into the tank 7. In fixing the heater unit 20, the cleaning unit 7 heats the cleaning water via the cleaning tank 7, and in order to improve the heat transfer efficiency, the spherical unit 1 is used.
A filler obtained by mixing aluminum powder with silicone resin, which is a heat-resistant member, is applied between the heater unit 9 and the heater unit 20. Further, in order to make the heater unit 20 a ventilation path at the time of drying, the air flows through the air inlet 22, the blower 23, the duct 24, and the heater unit cover 21, and flows into the cleaning tank 7 from the blowing port 25 provided on the back of the cleaning tank 7. It is configured to be fed with wind, and is connected to an exhaust port 26 on the upper front surface of the main body 1.

Although not shown, a water supply valve for water supply, a drainage pump for drainage, a water level sensor for detecting the amount of water supply, and the like are also installed at predetermined locations.

The operation of the dishwasher in the above configuration will be described for a standard operation cycle.

The operation cycle is "washing", "rinsing with water",
The process proceeds in the order of “rinsing with hot water” and “drying”.

The upper car 11 and the lower car 12 are pulled out to the front, and the dishes are set in the cars 11 and 12.

Next, the detergent is put in, the door 3 is closed, and the operation is started by operating the push button.

In the "washing" step, when the water is supplied to the specified water level, the water supply is stopped, and the circulation pump unit 13 is operated at the same time as the energization of the heater unit 20 is started. The circulation pump unit 13 pressurized water is sent to a lower arm nozzle 17 and a lower inlet 18 b of a water guide pipe 18 provided separately from the washing water jet port 16 by a distribution function of the nozzle shaft 14, and further, an upper outlet of the water guide pipe 18. 18c, is sent to the washing water inlet 15b of the upper arm nozzle 15 and is sprayed from the small hole 17a of the lower arm nozzle 17 and the small hole 15a of the upper arm nozzle 15, and at the same time, the lower arm nozzle 17, and the upper arm nozzle 15 starts rotating.

Then, the small hole 15a of the upper arm nozzle 15
The washing water sprayed upward from above wash the dishes set in the upper basket 11, and the reflected water partially colliding with the ceiling of the washing tank 7 scatters downward, and the splash water is set again in the upper basket 11. It hits the dishes and contributes to the washing of the dishes.

On the other hand, the washing water sprayed upward from the small holes 17a of the lower arm nozzle 17 is used to wash dishes set in the lower basket 12, and the washing water partially reaching the upper part of the lower basket 12 is used for washing the dishes. Falling water after washing the tableware set in 11 together with the tableware set in the lower basket 12 again,
Contributes to washing dishes.

The water pipe 18 has a substantially central portion 1 in the height direction.
8a is smaller than the lower inlet 18b and the upper outlet 18c, and the upper arm nozzle 15 is provided with a washing water inlet.
By reducing the cross-sectional area of the flow path of the throat 15c provided between the nozzle 15b and the plurality of washing water injection holes 15a, the velocity head is converted into a pressure head by a venturi action, and the efficiency as fluid transport is improved. The cleaning water can be injected from each of the arm nozzles 15 and 17 by increasing the pressure. The number of revolutions of the upper and lower arm nozzles 15 and 17 is about 20 revolutions per minute, and the washing water hits the dishes set in the upper basket 11 and the lower basket 12 of the washing tank 7 evenly, and the jetting power of the line place water and Cleans dishes with the action of warm water and detergent.

Here, the partial drop of the circulating washing water at the washing water inflow port 15b of the upper arm nozzle 15 will be described.

The jet water from the upper outlet 18c of the water pipe 18 partially scatters at the washing water inlet 15b of the upper arm nozzle 15 as collision reflected water and scatters downward. This scattered water not only changes the flight angle and the distance by the action of the inclination angles θ ₁ , θ ₂ , and θ ₃ , but also has a concave water passage formed by the flow passage restricting wall 27 so that the flow passage is concentrated. The rotation of the upper arm nozzle 15 causes the water passage outlet 29 to form a substantially jet stream and act to apply washing water to the dishes set in the lower basket 12.

The maximum water temperature at this time is set at 60 ° C., and the “washing” step is completed 5 minutes after detecting this temperature.

Next, "water rinsing" is performed. This is a step of washing off the detergent components, and "water supply-jet-drainage" is usually performed three times.

Thereafter, a "hot water rinsing" step is started. In this step, spraying is continued while the temperature of the rinsing water is heated to about 70 ° C. for the purpose of sterilizing and heating tableware in the tank.

Next, after "draining", the process proceeds to a "drying" step. The drying operation is performed by controlling the energization of the blower 23 and the heater unit 20, and after a lapse of a predetermined time, the operation is stopped upon notification of completion.

In the embodiment, when the flow passage cross-sectional area of the substantially central portion 18a in the height direction of the water conduit 18 is smaller than the lower inlet 18b and the upper outlet 18c, that is, the water conduit 18 is formed by a Venturi tube. Although the case has been exemplified, the cleaning water inlet 15b having an enlarged frontage is located below the upper arm nozzle 15 so as to be spaced apart from the upper outlet 18c of the water guide pipe 18, and the cleaning water inlet 15b and a plurality of cleaning water injection small holes are provided. If the flow path cross-sectional area of the throat portion 15c provided between the upper arm nozzle 15 and the plurality of small water injection holes 15a is made smaller than the flow path cross-sectional area of the upper arm nozzle 15, the water guide pipe 18 May not be a Venturi tube, but may be constituted simply by a tubular material. In this case, the velocity head is converted into a pressure head by the Venturi action of the upper arm nozzle 15, and Injecting the wash water from Munozuru 15.

The advantages of using the Venturi pipe as the water pipe 18 are as follows.

That is, even if the center of the washing water inlet 15b located on the upper arm nozzle 15 side is slightly deviated from the center of the water guiding pipe 18, if the water guiding pipe 18 is constituted by a Venturi pipe, Upper outlet 1 of this water pipe 18
Since the jet branch discharged from 8c spreads and reaches the washing water inlet 15b of the upper arm nozzle 15, a decrease in the efficiency of water supply to the upper arm nozzle 15 can be suppressed as much as possible, and the installation of the upper arm nozzle 15 and the water guide pipe 18 can be suppressed. A margin can be given to the accuracy.

[0047]

According to the present invention, the upper arm nozzle for injecting the washing water to the dishes set in the upper basket is installed at the lower part of the upper basket independently of the water pipe, thereby reducing the size of the upper arm nozzle. The washing water sprayed upward from the holes wash the dishes set in the upper basket, and the reflected water that partially collides with the ceiling of the washing tank scatters downwards, and this splashed water hits the dishes set in the upper basket again. , Contributes to the washing of dishes.

Further, a part of the umbrella-shaped washing water inlet of the upper arm nozzle scatters downward as collision reflected water, but is scattered downward. In addition to changing the flight angle and distance, the configuration is such that the flow path is concentrated, so that the rotation of the upper arm nozzle makes a substantially jet stream and hits the dishes set in the lower basket evenly. That is, the washing water can effectively contribute to washing of the dishes.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an overall internal structure showing an embodiment of a dishwasher according to the present invention.

FIG. 2 is a partial sectional view of FIG. 1 showing a positional relationship between upper and lower arm nozzles 15, 17 and a water pipe 18.

FIG. 3 is a longitudinal sectional view showing a modification of the upper arm nozzle 15.

FIG. 4 is an enlarged bottom view of FIG. 3;

FIG. 5 is an explanatory view comparing the cross sections of the water passages of FIG. 4;

[Explanation of symbols]

7: Cleaning tank, 13: Circulation pump unit, 14: Nozzle shaft, 15: Upper arm nozzle, 15a: Upper arm nozzle small hole, 15b: Cleaning water inlet, 15c: Upper arm nozzle throat, 17: Lower arm nozzle, 17a: small hole of lower arm nozzle, 18, 18a: water guide pipe, 18b: lower inlet of water pipe, 18c: lower outlet of water pipe, 27: flow restricting wall, 28
... water passage, 29 ... water passage outlet.

Claims (3)

[Claims] 1. A washing tank, an upper basket, a lower basket, a pressurized water supply means for washing dishes, a heater for changing water to hot water to raise the temperature in the washing tank, and a washing in the washing tank. Means for discharging water out of the machine, and control means for executing the steps of “washing”, “rinsing with water”, “rinsing with hot water”, and “drying” of the tableware. An arm nozzle and an upper arm nozzle which is separated from the lower arm nozzle and supplied to an upper arm nozzle rotatably mounted on an upper car independently of the water conduit through a water conduit attached to a lower car, and the upper arm nozzle A dishwasher for washing dishes by injecting washing water from the small holes of the lower arm nozzle, wherein the upper arm nozzle has a throat portion provided between a washing water inlet and a plurality of small holes for spraying washing water. Reduce the cross-sectional area of the flow channel The flow path cross-sectional area of the upper arm nozzle is smaller than that of the upper arm nozzle, and a substantially circular flow path restriction having a plurality of openings outside the inner diameter of the throat on the inner surface of the umbrella-shaped washing water inlet. A dishwasher characterized by a wall. 2. The dishwasher according to claim 1, wherein the plurality of openings of the flow path restricting wall are branch walls, and a concave water passage is formed toward the outer periphery of the umbrella-shaped inner surface. 3. The concave water passage according to claim 2, wherein the concave water passages form inclinations of θ ₁ , θ ₂ , and θ ₃ with respect to a vertical axis, respectively, and the relationship is θ ₁ <θ ₂ <θ ₂ . dishwasher.