JPS6253173B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fully automatic dishwasher that utilizes foam, and is intended to facilitate the removal of protein stains such as eggs.

Structure of conventional example and its problems Conventional general dishwashers were of a type that sprayed washing water onto dishes from a rotating spray nozzle to wash the dishes. This method requires a lot of washing water and also has the problem of making a lot of noise during washing. In order to solve this problem, a foam cleaning method that utilizes the cleaning power of foam can be considered.

A dishwasher that uses this foam is shown in Figure 1.
In the figure, there is a washing tank 10 that accommodates the objects to be washed, and a water spraying device consisting of nozzles 1 and 2 that sprays or scatters washing liquid onto the dishes while being rotated by hydraulic power and applies chemical and mechanical force to the objects to be washed. Tank 10
A pump 3 for pumping water to the nozzles 1 and 2 is provided inside the cleaning tank 10 and at the lower part of the cleaning tank 10, respectively. Further, there is a recess 4 at the bottom of the cleaning tank 10, and a heating element 5 is attached to the outer periphery of the recess 4. The recess 4 is also connected to a pump 3 through a pipe 6, so that the pump 3 circulates cleaning liquid or water. Reference numeral 7 denotes a blower having a heating device for generating bubbles by forcefully feeding air into the cleaning liquid stored in the recess 4. A valve 8 is provided in the passage to prevent the liquid from flowing back, thereby forming a bubble generating device. Reference numeral 9 denotes an air vent provided above the cleaning tank 10, through which excess foam is also discharged. 14 is a pump for drainage. Note that 11, 12, and 13 are all tableware to be washed.

Next, the operation will be explained based on the above configuration.

Figure 2 shows the cleaning process diagram, and Figure 3 shows the water temperature in the process. First, foam pre-soaking is performed at a high temperature of 50 to 60°C, followed by main washing, and then washing is carried out in a process called Suzuki drying. It is shown that. First, cleaning tank 1
When water accumulates in the recess 4 of No. 0 up to the A side, the heating element 5 is automatically energized and the precipitate is added at the same time. This detergent is a foaming detergent. This detergent is 50℃
When the temperature reaches ~60℃, valve 8 opens and the temperature is set to 50℃.
Air heated to .degree. C. to 60.degree. C. is sent by a blower 7 to sequentially generate bubbles in the cleaning tank 10, and the bubbles pass between the objects to be cleaned 11, 12, and 13 and continue to rise. When the cleaning tank 10 is completely filled, the foam is discharged to the outside from the air vent hole 9 according to the amount of foam generated. In this foam presoaking, the objects to be cleaned 11, 1
2 and 13 come into contact with foam containing highly concentrated detergent, and the stains are removed, and the foam bursts and the highly concentrated detergent adheres to the dishes, and its chemical action removes the stains, and the bonding occurs. or weaken it. Also, unlike other presoaks (such as soaking), foam is constantly expanding, moving, and bursting, so some mechanical force is also generated, and in foam presoaking, the bonding force of contaminants is is considerably weakened. Next, drain this detergent liquid, fill it with detergent (defoaming detergent) and water up to the B side, and activate the pump 3 while heating with the heating element 5 to squirt the detergent liquid from the nozzles 1 and 2. A main washing process is performed in which dirt is completely removed by chemical and mechanical force by hitting the objects 11, 12, and 13 to be cleaned.

As described above, dishes are washed through the process of foam presoaking, in which the dishes are immersed in high-temperature foam, and main washing, in which the dishes are sprayed with hot water.

The problem with such a cleaning process is that protein stains are difficult to remove, and this is due to the high temperature foam pre-soaking. A closer look at foam presoaking revealed that the temperature of the foam makes it difficult to remove protein stains, such as those from eggs. The reason why the temperature of the foam is set to a high temperature is to make it easier to remove oil and fat stains such as lard, but high temperatures denature proteins and make stains extremely difficult to remove.Furthermore, they also stick firmly to dishes. It has become a stain that is difficult to remove. In order to remove this denatured protein stain, it was necessary to add detergent to the hot water used in the main washing process, and to use strong mechanical force (spray pressure, water volume, etc.) to increase the jetting force of the detergent solution. In this way, high-temperature presoaking, which is performed to reduce the cleaning time, actually lengthens the cleaning time. Conversely, if there is no denatured protein stain, detergent in the main washing process can be eliminated.
Furthermore, the mechanical force can be reduced to the extent that swollen starch stains can be removed, and there is no need to raise the water temperature during cleaning.

In addition, although literature states that egg protein deterioration occurs at temperatures above 60°C, it is said that egg proteins in a thin state, such as dirt, undergo deterioration even at around 50 to 60°C. A temperature of 50 to 60°C is not considered to be a preferable temperature.

Purpose of the Invention The present invention aims to shorten the time of the main washing process and reduce mechanical and heating power by pre-soaking which does not cause thermal denaturation of protein stains such as eggs adhering to tableware.

Structure of the Invention The dishwasher of the present invention includes a washing tank that accommodates dishes to be washed, a foaming device that selectively supplies low-temperature or high-temperature foam for foam pre-soaking into the washing tank, and a foaming device that selectively supplies low-temperature or high-temperature foam for foam pre-soaking to the washing tank, and a washing machine for washing dishes to be washed. The foam pre-soaking is carried out in two stages: low-temperature foam pre-soaking and high-temperature foam pre-soaking, and after the foam pre-soaking is complete, main washing is performed with low or high temperature water. This process cleans the eggs and other proteins adhering to the dishes to be washed without thermally denaturing them.

DESCRIPTION OF EMBODIMENTS FIGS. 1 and 4 regarding embodiments of the present invention,
This will be explained with reference to FIG. FIG. 1 shows a dishwasher that uses foam, and since its configuration has already been explained, it will be omitted here.

The two-stage foam presoaking process is performed as follows. At the same time that water accumulates in the recess 4 of the cleaning tank 10 up to the A side, detergent is added. Next, the valve 8 is opened, and air at low temperature, that is, room temperature, is sent from the blower 7 to generate low-temperature bubbles, and the cleaning tank 10 is filled with low-temperature bubbles one after another. This low-temperature liquid passes between the objects to be washed 11, 12, and 13 and comes into contact with the tableware. Since this low temperature foam is below the denaturation temperature of proteins such as eggs, it dissolves the proteins without denaturing them. After this pre-soaking has been carried out for a predetermined period of time, the heating element 5 is energized to raise the temperature of the detergent solution, and the blower 7 also sends hot air to generate high-temperature foam to perform foam pre-soaking. As the temperature of the bubbles increases, the starch stains on the dishes begin to swell, and the oil stains also melt. At the end of this foam pre-soaking, protein stains and oil stains have been washed away, leaving only swollen starchy stains and solid stains with almost no adhesion. The above is the foam presoaking process.

Next, drain this detergent solution and add water up to the B side to perform the main washing process. In the main washing, the pump 3 is operated to spray water from the nozzles 1 and 2 to wash the objects 11 and 1.
2 and 13, the remaining starchy stains and solid stains are completely removed.
In this main washing, as mentioned above, there is no protein stain that has denatured and firmly adhered to the tableware, so as shown in Figure 5, the main washing process only requires a short time and low mechanical force, and water temperature at room temperature is sufficient. be.

The steps after rinsing (heat rinsing) after the main washing are the same as the conventional ones, so the explanation will be omitted.

As described above, the dishwasher of the present invention employs a two-step pre-soaking process and a main washing process to clean protein stains such as eggs adhering to dishes without thermally denaturing them. It is capable of satisfactorily cleaning stains adhering to tableware such as oil stains and starch stains.

Effects of the Invention As described above, the dishwasher of the present invention performs foam pre-soaking in two stages: low-temperature foam pre-soaking that prevents denaturation of protein stains, and high-temperature foam pre-soaking that cleans oil stains and swells starchy stains. In addition to the pre-soaking process, we added a main washing process in which water is sprayed onto the dishes and the dishes are washed using mechanical power, increasing the cleaning performance during foam pre-soaking and reducing the mechanical power (water jetting force, amount of water) during the main washing process. It also has the effect of eliminating the need for detergent in the main washing process, and has great industrial value in terms of energy saving, resource saving, and pollution.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the outline of a dishwasher that uses foam, Figure 2 is a cleaning process diagram of a conventional dishwasher that uses foam, Figure 3 is a diagram showing the water temperature in each process, and Figure 3 is a diagram showing the water temperature in each process. FIG. 4 is a diagram showing the washing process of the dishwasher using the foam of the present invention, and FIG. 5 is a diagram showing the water temperature in each process. 1, 2... Nozzle, 5... Heating element, 7... Air blower, 10... Washing tank, 11, 12, 13... Tableware to be washed.

Claims (1)

[Claims] 1 A washing tank that accommodates dishes to be washed, a foaming device that selectively supplies low or high temperature foam for foam presoaking into the washing tank, and a foaming device that sprays low or high temperature water for main washing onto the dishes to be washed. The dishwasher is equipped with an injection device that performs foam presoaking in two stages: low-temperature foam presoaking, followed by high-temperature foam presoaking, and after the foam presoaking is completed, main washing is performed with low or high temperature water.