JPH0713635Y2 - Ultrasonic dishwasher - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an ultrasonic dishwasher for washing dishes using ultrasonic waves.

[Conventional technology]

Generally, a cleaning machine using ultrasonic waves removes stains adhering to the surface of the object to be cleaned by air bubbles generated by the cavitation effect of ultrasonic waves. In such an ultrasonic cleaning machine, it has been known that the amount of air dissolved in water gradually decreases due to the generation of bubbles, the cavitation hardly occurs, and the cleaning ability decreases.

Japanese Unexamined Patent Publication No. 61-90633 discloses a technique of eliminating the deterioration of the cleaning ability due to the lack of air and applying ultrasonic cleaning to a dishwasher.

This ultrasonic dishwasher is provided with an ultrasonic wave generator for generating ultrasonic waves and a bubble generator, and by supplying air into the water by the bubble generator, the underwater accompanying the generation of bubbles of the cavitation effect It is designed to compensate for the decrease in the amount of air.

[Problems to be solved by the device]

In the above conventional ultrasonic dishwasher, since the bubble generator is used for replenishing air, (a) increase in cost by adding an air pump etc., and (b) air pump etc. integrated in the washing machine. As a result, the size of the machine has increased, (c) the power consumption for operating the air pump, etc. has increased, and (d) the mechanical parts such as the air pump have increased, making it more prone to malfunction.

In addition, in the conventional ultrasonic dishwasher, the dishes are washed while the washing tank is filled with water, and after the washing is finished, the dishes are drained from the bottom of the washing tank, so they are separated from the dishes and float on the water surface. There was a possibility that the dirt that had been present would descend with the surface of the water when it was drained and reattach to the dishes.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a cleaning tank for putting dirty dishes, an ultrasonic wave generator for generating ultrasonic waves in the cleaning tank, and a shower device for spraying water or hot water from the upper surface of the cleaning tank. An overflow drain provided in the upper part of the cleaning tank, the ultrasonic generator is operated to inject water or hot water from the shower device, and further ultrasonic waves are used to cause dirty water to overflow from the overflow drain. A dishwasher is provided.

[Action]

When the ultrasonic wave generator is operated, the ultrasonic waves hit the dishes in the washing tank to cause cavitation, and bubbles are generated. The bubbles remove stains on the surface of the tableware. On the other hand, the amount of air dissolved in water gradually decreases due to the generation of bubbles, but if water is jetted from the top of the washing tank by the shower device with the operation of the ultrasonic generator, the water will be washed together with the air in the atmosphere. It vigorously enters the water in the tank, and the air dissolves in the water in the cleaning tank.

Further, old water lacking air is drained from the overflow drain port instead of new water supplied from the shower device. At this time, since dirt such as oil having a low specific gravity floats on the water surface, it is discharged from the overflow drain together with the drained water.

〔Example〕

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

Reference numeral 1 denotes a box-frame-shaped main body of a washing machine, which has an opening 2 on the front surface thereof, and an opening / closing door 3 is attached to the opening 2 so as to be freely opened and closed. A transparent window portion 4 is provided above the opening / closing door 3 so that the inside can be seen through even when the opening / closing door 3 is closed. A cleaning tank 5 is fixed to the inner surface of the opening / closing door 3 below the window 4. The cleaning tank 5 has a fan-shaped planar shape centered on the shaft portion 3a of the opening / closing door 3, and is positioned inside the cleaning machine body 1 as shown by the solid line in FIG. 3 when the opening / closing door 3 is closed. Along with the opening operation of the opening / closing door 3, it projects to the outside of the main body 1 of the washing machine as shown by the chain line in the figure. The cleaning tank 5 has a double structure of an inner frame body 5a and an outer frame body 5b, and a space 6 is formed between the inner frame body 5a and the outer frame body 5b. An overflow drainage port 7 is provided above the inner frame body 5a of the cleaning tank 5, and the overflow drainage port 7 communicates with a drainage flow channel 8 provided in the space 6. The lower end of the drainage channel 8 opens onto a drainage receiver 9 formed at the bottom of the main body 1 of the washing machine. The drainage receiving portion 9 has a bottom portion of the washing machine body 1 lower than the lower edge of the opening 2 to form a tray shape in which drainage does not flow out of the opening 2, and from the bottom portion thereof, the washing machine body 1
The water accumulated in the drain receiving portion 9 is drained through the drain pipe 10 on the side surface. A drain port 11 provided at the center of the bottom of the cleaning tank 5 also communicates with the drain receiver 9, and after the cleaning is completed, all the water in the cleaning tank 5 passes through the drain receiver 9 from the drain port 11. Be drained.

The inside of the washing machine main body 1 is vertically divided by a top plate 1a, and an ultrasonic wave generator 12 is installed on the top plate 1a. The ultrasonic generator 12 generates ultrasonic energy of 15 KHz to 60 KHz. The ultrasonic oscillators 13, 13 ... Which output the ultrasonic energy of the ultrasonic generator 12 are disposed in the space 6 between the inner frame body 5a and the outer frame body 5b of the cleaning tank 5, and the cleaning tank 5 A plurality of them are dispersed and fixed to the back surface of the inner frame body 5a located at the bottom of the. This ultrasonic oscillator 13,13 ...
The ultrasonic generator 12 and the ultrasonic generator 12 are connected by a wire 14 that passes through the shaft portion 3a of the opening / closing door 3.

On the other hand, a shower device 15 is provided on the lower surface of the top plate 1a inside the main body 1 of the washing machine. The shower device 15 is provided with a fine porous material on the surface facing the upper surface of the cleaning tank 5 in a state where the cleaning tank 5 is placed in the main body 1 of the cleaning machine, and is directly connected to general water supply. 1kg / cm ^{2 to} 5kg / c from supply pipe 16
By supplying water at a water pressure of m ² , water is jetted toward the cleaning tank 5. A solenoid valve is installed in the middle of the supply pipe 16.
A solenoid valve 17 is provided, and the solenoid valve 17 controls the injection and stoppage of water.

In addition, in the figure, 18 is a control panel section provided on the upper front part of the washer body 1, 19 and 20 are provided respectively at the drainage port 11 of the washing tank 5 and the drain pipe 10 of the drainage receiving section 9 of the washer body 1. A solenoid valve 21 is a sensor that detects the amount of water in the cleaning tank 5.

Next, the operation will be described.

First, the opening / closing door 3 is opened and the washing tank 5 is projected outside, and dirty dishes are put in the washing tank 5. When the opening / closing door 3 is closed and a cleaning start signal is input, the electromagnetic valve 17 is first opened to supply water from the shower device 15 to the cleaning tank 5. When the sensor 21 detects that the water reaches a certain level, the ultrasonic wave generator 12 operates. The ultrasonic energy of the ultrasonic generator 12 is transferred from the ultrasonic oscillators 13, 13 ... to the cleaning tank 5.
It is transmitted to the water and hits the tableware inside. Then, bubbles are generated on the surface of the tableware due to the cavitation effect. The bubbles separate the stains on the surface of the tableware, the oil having a low specific gravity floats on the water surface, and the stains having a high specific gravity settle at the bottom of the cleaning tank 5. Operation of ultrasonic generator 12 and shower device
The injection of 15 waters has been continued since the beginning of cleaning. By this water injection, new water containing air is supplied into the cleaning tank 5, and at the same time, air in the atmosphere is also entrained in the water in the cleaning tank 5 due to the water injection force. Dissolves in water. Therefore, it is possible to supplement the decrease in the amount of air in water due to the generation of bubbles due to the cavitation effect. In addition, bubbles generated by jetting water diffusely reflect ultrasonic waves, so that it is possible to remove stains even on the details of tableware.

Then, the water level in the cleaning tank 5 rises due to the jet of water, and the water reaching the overflow drainage port 7 overflows from there and flows into the drainage channel 8 in the space 6 of the cleaning tank 5,
The water is drained from the drainage receiver 9 through the drainage pipe 10 to the outside of the machine. At this time, dirt with a low specific gravity such as oil floating on the water surface is discharged from the overflow drain port 7 to the outside of the machine together with the drainage of water.

When the cleaning is completed in this way, the shower device 15 and the ultrasonic generator 12 are stopped, and then the electromagnetic valve 19 is opened to drain the water in the cleaning tank 5 out of the machine.

It is also possible to dry the dishes by adding a warm air generator to the ultrasonic dishwasher.

Further, some vibration is generated in the cleaning tank 5 when the ultrasonic wave generator 12 is operated, but since the cleaning tank 5 and the cleaning machine main body 1 are formed of different members, the vibration is hard to be transmitted to the outside of the machine.

[Effect of device]

As described above, according to the ultrasonic dishwasher of the present invention, since the decrease in the amount of air in the water due to the cavitation effect can be compensated by the water injection by the shower device 15, the cavitation effect is stably connected, and the dishware The cleaning is good.

In addition, unlike the conventional bubble generator, the shower device 15 does not require complicated machinery such as an air pump, so that manufacturing cost reduction, power consumption reduction, machine downsizing, and simple structure failure There are many practical effects such as reduced rates.

Further, since dirt such as oil floating on the water surface is discharged out of the machine together with overflowing water, dirt does not float on the water surface after the cleaning is completed. Therefore, unlike the conventional case, stains are not redeposited, and the cleaning effect of dishes is dramatically improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view in which an opening / closing door is opened, FIG. 2 is a vertical sectional front view, and FIG. 3 is a transverse plan view. 5 ... Cleaning tank, 7 ... Overflow drainage port, 12 ... Ultrasonic generator, 15 ... Shower device.

Claims (1)

[Scope of utility model registration request] 1. A cleaning tank in which dirty dishes are put, an ultrasonic wave generator for generating ultrasonic waves in the cleaning tank, a shower device for spraying water or hot water from the upper surface of the cleaning tank, and an upper part of the cleaning tank. An overflow drain opening is provided, wherein water or hot water is jetted from the shower device together with the operation of the ultrasonic generator, and further, dirty water is overflowed from the overflow drain. Dishwasher.