JPH03289924A - Dish washer - Google Patents

Abstract

PURPOSE:To deodorize and exhaust odor contained in exhaust gas by branching an air supply passage running from a blower to an exhaust port, providing a damper capable of free turning and a high voltage ceramic discharge unit, and positioning an ozonolysis catalyst at the exhaust port. CONSTITUTION:Honeycomb-like activated charcoal 11 is positioned at the exhaust port 10 of a dish washer. The air passage 9a of a blower 8 installed on the way of an intake passage 9a is branched into two passages. One of the passages is made continuous to a washing bath 1, and the other continuous to an ozone supply passage 12. Also, the passage continuous to the washing bath 1 is also continuous to the exhaust port 10 via a damper 13 capable of freely turning and positioned at the end of the ozone supply passage 12 leading to an ozone mixing section 16 at the intermediate position of a passage from the washing bath 1 to the exhaust port 10. A high voltage ceramic discharge unit 14 generating ozone is positioned in the ozone supply passage 12 between the damper 13 and the blower 8. According to the aforesaid construction, the odor of dishes contained in steam reacts with ozone gas and is decomposed through oxidation. In addition, ozone is decomposed into oxygen and active oxygen on the surface of the honeycomb-like activated charcoal 11 at the exhaust port 10.

Description

[Detailed description of the invention] Industrial applications This invention relates to household dishwashers.

BACKGROUND OF THE INVENTION Conventionally, this type of dishwasher has been constructed as shown in FIGS. 4 and 6. That is, as shown in FIG. 4, when a certain amount of water is supplied into the cleaning tank in which detergent has been added in advance, the cleaning pump 2 is started, and the cleaning water is sucked into the cleaning pump 2 through the filter 3. , pressurized nozzle 4
is injected from. The washing water sprayed from the nozzle/I/4 washes the dishes 6 on the dishes 6 placed on the dishes 6, and then accumulates at the bottom of the washing tank 1, where it is sucked into the washing pump 2 again for washing. Circulates within the tank. At this time, the heater 7 heats the cleaning water to raise its temperature.

Further, the leftover food adhering to the tableware 6 is washed off, and when the washing water is sucked into the washing pump 2, it is captured by the flow filter 3 together with the washing water. After cleaning, drain the drain pump (
(not shown), the wash water is discharged to the outside of the machine. after that,
Again, a certain amount of water is supplied into the cleaning tank to perform rinsing in the same way as during cleaning, and after the rinsing is completed, the water is drained again.

This rinsing process is repeated several times, and then, with the heater 7 intermittently energized, air from outside the machine is introduced into the cleaning tank from the air intake port 9 by the drying fan 8, and the damp inside the cleaning tank is The entire process is completed by exhausting the air to the outside of the multi-machine through the exhaust port 1o shown in FIG. 5 and drying the inside of the washing tank and the dishes 6.

Problems to be Solved by the Invention In such a conventional configuration, when dishes 6 contaminated with food are washed, an unpleasant odor mixed with food fills the room during washing, and furthermore, fish with a strong odor may be When washing dishes contaminated with water, the fish odor in the washing tank was released into the room along with water vapor during the drying process, causing discomfort.

That is, since the cleaning water is heated to an elevated temperature during cleaning, the mixed odor of detergent and food leaks into the room from the exhaust port 10 along with water vapor. Furthermore, when washing dishes contaminated with blue fish such as sardines, sardines, and saury, which have a strong odor, fish oil is adsorbed to the inner walls and plastic parts of the dishwasher, and when the dishwasher goes into the drying process, odor components with low boiling points are detected. This was discharged into the room by the blower fan 8 together with the heated water vapor in the cleaning tank, causing a bad odor to spread throughout the room, making the user feel uncomfortable.

Therefore, the first object of the present invention is to deodorize the odor of the objects to be washed contained in the exhaust air from a dishwasher and then exhaust it indoors. The second purpose is to prevent dew condensation from forming on the deodorizing device.

Means for Solving the Problems In order to achieve the above-mentioned first object, the present invention branches the air passage from the air blower fan of the dishwasher to the exhaust port, and creates an ozone supply path in which a high-pressure ceramic discharge body is arranged. The ozone supply path communicates with the path leading from the cleaning tank to the exhaust port via a rotatable damper. Further, an ozone decomposition catalyst for decomposing excess ozone is disposed at the exhaust port.

Furthermore, in order to achieve the second objective, a heating element is arranged on the back surface of the high-voltage ceramic discharge body.

Function According to the above configuration, when the blower fan is not in operation, the path leading from the cleaning tank to the exhaust port, which is in a high humidity atmosphere, is blocked by the damper. As a result, moisture is prevented from entering the ozone supply path on the side where the high-voltage ceramic discharge body is disposed. When the blower fan is in operation, a rotatable damper based on wind pressure is opened, and ozone generated by the high-pressure ceramic discharge body is mixed with odor-laden water vapor and air from inside the dishwasher in a path leading from the cleaning tank to the exhaust port. The odor components are oxidized and decomposed by ozone. Furthermore, unreacted surplus ozone is decomposed into oxygen and active oxygen by the ozone decomposition catalyst, but during this decomposition reaction, the unreacted odor components are completely oxidized and decomposed by the active oxygen generated on the catalyst surface. be. Additionally, when ozone is not being supplied during dishwashing, odor components are adsorbed by the ozone decomposition catalyst placed at the exhaust port, and decomposed on the ozone decomposition catalyst when ozone is supplied again during the drying process. be. As a result, the deodorized steam and air are exhausted, and unpleasant odors are not scattered indoors.

Further, a heating element is provided on the back side of the electrode of the high-pressure ceramic discharge body provided in the dishwasher, and the electrode temperature of the high-pressure ceramic discharge body is heated to a temperature equal to or higher than the temperature inside the washing tank during operation of the dishwasher.

As a result, dew condensation caused by the temperature difference between the high-temperature moisture that has entered from inside the cleaning tank and the surface of the high-voltage ceramic discharge body electrode can be prevented, and discharge failures due to insulation deterioration due to dew condensation can be prevented.

Embodiment The embodiment shown in Figure 1 is a tableware washing iso N manufactured by Matsushita Electric Industrial Co., Ltd.
Honeycomb-shaped activated carbon 11 with a volume of 100 m1 (granular Shirasagi GOC4 manufactured by Takeda Pharmaceutical Co., Ltd.) was installed in the exhaust port 10 of P-5600.
/8-2) is arranged, and the ventilation path 9a of the ventilation fan 8 provided in the middle of the intake path 9a is branched into two paths, one of which is connected to the cleaning tank 1, and the other one is connected to the ozone supply path 12. let

The ventilation path communicating with the cleaning tank 1 is from the cleaning tank 1 to the exhaust port 10.
The ozone supply path 12 communicates with the exhaust port 1o via a rotatable damper 13 disposed at the end of the ozone supply path 12, which communicates with the ozone mixing section 16 on the way to the ozone mixing section 16. A high-voltage ceramic discharge body 14 is disposed in the ozone supply path 12 between the damper 13 and the blower fan 8, and the ozone generation amount is 8.03/h (25° C., 60% RH).

Next, the operation of this embodiment will be explained in Figs. 1, 2, and 4.
This will be explained using figures. In the drying process, the inside of the washing tank and the tableware 6 are heated and heated by the heater 7, and the blower fan 8 takes in low-humidity outside air into the washing tank through the intake port 9 to dry the inside of the washing tank. The steam is exhausted to the outside of the machine through a honeycomb-shaped activated carbon 11 attached to an exhaust port 1o shown in FIGS. 1 and 2. At the same time, the other branched air passage branched from the air blower fan 8 in which the high-voltage ceramic discharge body is disposed passes through the ozone supply passage 12 and the damper 13 disposed at the end of the ozone supply passage 12. Ozone gas with a concentration of 0.6 ppm? The air contained therein is supplied to a path leading from the cleaning tank 1 to the exhaust port 1°.

Odor components with a low boiling point adsorbed on the leftover food and plastic parts of the dishwasher captured by the filter 3, that is, the odor of the object to be cleaned contained in the steam, flows from the cleaning tank 1 to the exhaust port 1Q. Odor components are oxidized and decomposed by reacting with the ozone gas in the passage, and surplus ozone is decomposed into oxygen (02) and active oxygen (O.) on the surface of the honeycomb-shaped activated carbon 11 placed at the exhaust port 1Q. . At this time, unreacted odor components are completely decomposed by the active oxygen.

In addition, in the cleaning process where ozone is not supplied, the exhaust port 10
Odor components are adsorbed on the surface of the honeycomb-shaped activated carbon 11 arranged in the .

Note that the high-voltage ceramic discharge body 14 tends to become unstable in discharge or suffer from discharge failure in a humid atmosphere. Therefore, when ozone is not supplied, the ozone supply path 12
By shielding the damper 13 with its own weight, moisture is prevented from entering the high-voltage ceramic discharge body 14.

Further, when ozone is supplied, the damper 13, which is larger than the contact surface with the ozone supply path, is rotated and opened by the exhaust air pressure from inside the cleaning tank and the wind pressure of the ozone supply path.

As a result, even when washing dishes contaminated with strong-smelling blue fish, etc., deodorized, odorless air is exhausted into the room from the exhaust port 10 of the dishwasher, scattering unpleasant odors into the room. There isn't.

It goes without saying that the same effect can be obtained by using a manganese/titanium based ozone decomposition catalyst instead of the honeycomb activated carbon 11.

In the embodiment shown in FIG. 3, a 15Q2W resistor 16 is fixed to the back side of the electrode of the high-voltage ceramic discharge body 14.

To explain the operation of this embodiment, DC 3.5 V is applied to the resistor 16 at the same time as the start of heating rinsing, which is a pre-drying process, to energize the resistor 16 and heat the electrode.

At this time, the rinsing water in the washing tank 1 is shifted by the heater 7.
Although it is gradually heated to ℃, the steam generated in the cleaning tank gradually flows back through the gap between the damper 13 and the blower fan 8 into the blower path in which the high-voltage ceramic discharge body 14 is arranged. . However, the high-voltage ceramic discharge body 14 is heated to 70° C. or higher by the resistor 15, and stable discharge can be maintained without condensation that would cause deterioration of insulation.

As a result, the ozone necessary for deodorization is removed from the cleaning tank 1 through the exhaust port 1.
This means that the odor component can be stably supplied to the path leading to 0, and the odor components can be decomposed.

It goes without saying that the same effect can be obtained by arranging a surface heater in place of the resistor of the present invention or by printing the resistor.

Effects of the Invention As is clear from the description of the embodiments above, the present invention allows the odor components contained in the steam to be passed from the washing tank to the exhaust port during drying even when dishes contaminated with food with a strong odor are washed. Ozone gas is oxidized and decomposed along the route, and the unreacted excess ozone is decomposed into oxygen by the ozone decomposition catalyst. In addition, when ozone gas is not supplied, the ozone decomposition catalyst adsorbs odor components, so unpleasant odors are not scattered indoors, making it very safe.

Furthermore, by providing a heating element on the back side of the high-voltage ceramic discharger electrode, when moisture in the cleaning tank flows back, condensation occurs due to the temperature difference with the high-voltage ceramic discharger electrode surface, making the discharge unstable. This can prevent ozone from being generated at a predetermined concentration due to poor discharge.

As a result, even if the sealing of the damper is incomplete, the insulation of the high-voltage ceramic discharge body is protected, so odor components can be completely decomposed by ozone.

[Brief explanation of the drawing]

The first diagram is a perspective view of the main parts of a dishwasher according to an embodiment of the present invention, FIG. 1 (B) is a rear view of the main parts, and FIG. Fig. 3 is a side view of a high-pressure ceramic discharge body with a heating element arranged, Fig. 4 is a longitudinal sectional view of a conventional dishwasher, and Fig. 6 is a longitudinal sectional view of the main part of the disassembled part. FIG. 1...Cleaning tank, 8...Blower fan, 9
...Intake port, 9a...Intake route, 10
...Exhaust port, 11...Honeycomb activated carbon, 12...--Ozone supply route, 13...
・Damper, 14...High voltage ceramic discharge body, 1
6...Resistor, 16...Ozone mixing section.

Claims (2)

[Claims] (1) An intake port and an exhaust port that communicate with the cleaning tank, and a blower fan that sends outside air into the cleaning tank through the intake port, with one branched air path of the blower fan connected from the cleaning tank to the exhaust port. A dishwasher characterized in that a branch air passage is provided which communicates with the leading passage via a damper, a high-voltage ceramic discharge body is disposed in the branch air passage, and an ozone decomposition catalyst is disposed at the exhaust port. (2) The dishwasher according to claim 1, wherein a heating element is provided on the back side of the electrode of the high-voltage ceramic discharge body.