JPS594606Y2 - dishwasher - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circulation type dishwasher that circulates air in a washing tank to perform drying and heat retention.

Conventional dishwashers supply air from outside the washing tank of the dishwasher, heat the air with a heating element, guide the heated air into the dishwashing tank, and dry it by bringing it into contact with the dishes to be dried. The structure is such that the humid air is exhausted outside the dishwasher (washing tank).

The problem with this structure is that the moisture on the dishes is exhausted outside the dishwasher, so the relative humidity inside the room where the dishwasher is installed and inside the sink, gas stove, and cooking table is high. Moreover, the smell of food on the tableware is exhausted into the room, which is unpleasant for the user.

Additionally, there are similar drawbacks to dishwashers that heat the air in the washing tank, bring the heated air into contact with the dishes, dry them, and then exhaust the humid air outside the dishwasher. .

This invention is an improvement on the above-mentioned drawbacks, and is a circulation type dishwasher that circulates drying air and installs a heat exchanger in the circulation path to dehumidify moisture in the circulating air and heat it to dry and keep it warm. It provides:

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

1 is the exterior of the dishwasher, and 2 is a washing tank made of plastic or the like and equipped with a door 3 that can be opened and closed.

4 is a plurality of discharge ports 5.5 arranged at the bottom of the cleaning tank 2.
The injection nozzle 6 is a water supply connecting pipe provided at the bottom of the water storage tank 2A, and is connected to a cleaning pump 7.

8 is a motor that rotates the cleaning pump 7.

Reference numeral 9 is a water supply connection pipe from the discharge port of the cleaning pump 7 and is connected to the injection nozzle 4.

10 is a drain pipe installed from the bottom of the water storage tank 2A,
11 is a drain pump connected to the drain pipe 10 , 12 is a motor that rotates the drain pump 11 , and 13 is a drain pump 11
This is the drain pipe from the outlet.

A steam generating chamber 16 covered with a steam cover 15 having a built-in steam/cleaning heater 14 is provided below the injection nozzle 4 and in the water storage tank 2A of the cleaning tank 2.

A steam generating port 17 for spewing out steam is formed at an appropriate position on the steam cover 15.

Reference numeral 18 denotes a heat sensing switch having a built-in temperature fuse (microtemp) for preventing excessive temperature rise, which is activated by sensing the temperature of the heater 14, and prevents an abnormal temperature rise when the heater 14 is idle.

Reference numeral 19 denotes a detergent supply box, which is disposed at the bottom of the door 3, and is supplied into the cleaning tank 2 by the action of a bimetal (not shown) depending on the usage state.

20 is a water supply hose connected to a water faucet.

Reference numeral 21 denotes an electromagnetic water supply valve through which tap water is supplied into the cleaning tank 2 from a water supply pipe 22 through a water supply port 23 provided on the upper side wall of the cleaning tank 2.

A branch pipe 24 branches off from the water supply hose 20 and is connected to a heat exchanger 27 .

25 is a water supply valve located in the middle of the branch pipe 24, and 26 is a flow rate adjustment valve that adjusts the flow rate to a constant level.

26A is a heat exchange pipe made of a copper pipe passing through the heat exchanger 27.

26B is a drain pipe of the heat exchange pipe 26A, which is connected to the upper part of the trap of the drain pipe 13.

26C is a check valve installed in the middle of the drain pipe 26C, and water from the drain pipe 26C flows to the drain pipe 13, but water from the drain pipe 13 flows to the drain pipe 26C.
It is designed so that it does not flow towards.

Reference numeral 28 denotes an air supply duct for circulation, through which air in the cleaning tank 2 is supplied through a slit portion of an intake port 29 at the rear upper part of the cleaning tank 2.

After passing through the heat exchanger 27, a circulation duct 28A is provided at the bottom of the heat exchanger 27, and an exhaust port 29 at the bottom of the rear part of the cleaning tank 2.
It is exhausted into the cleaning tank 2 through the slit section A.

28B is a pulley provided on the shaft of the drain pump motor 12; 28C is a pulley for rotating the circulation fan 28E provided in the duct 28A;
The power is transmitted by D.

That is, when the motor 12 rotates, the fan 28E rotates.

28F is a drain pipe that drains water droplets accumulated in the duct 28A into the cleaning tank 2, and condensed water flows into the cleaning tank 2 from the drain port 28G.

28H is a drying heater provided at the bottom of the duct 28A, which heats the dry air condensed in the heat exchanger 27 and sends it into the cleaning tank 2.

Reference numeral 30 is a tableware function installed above the spray nozzle 4 so as to be freely put in and taken out of the washing tank 2, and on which the tableware 30A is placed.

Reference numeral 31 is a time switch that controls according to a predetermined cleaning cycle and causes each process to be performed in sequence.

32 is a latch lever for opening and closing the door 3.

33 is an exhaust duct provided at the top of the door 3;
34 is its exhaust port.

Pressurized air, etc. in the cleaning tank 2 is exhausted from here.

35 is a connecting pipe connected to a water level switch 36A that operates by detecting the water level at the bottom of the cleaning tank 2 from the bottom of the water storage tank 2A.

36 is a thermostat provided at the tip of the heater 2BH of the duct) 28A, which controls the temperature of the exhaust gas discharged from the exhaust port 29A (it is controlled by turning the heater 28H ON and OFF).

Next, the operation in the above configuration will be explained.

First, the tableware rack 30 carrying the tableware 30A is inserted into the washing tank 2, and the time switch 31 is set, and the following steps are sequentially performed.

Pre-wash tap water is introduced by a water supply hose 20 and is supplied into the cleaning tank 2 from a water supply port 23 at the same time as the water supply valve 21 is opened.

When the water level in the cleaning tank 2 reaches a predetermined level, water supply is stopped and the cleaning pump 7 is driven.

Then, the water in the washing tank 2 is ejected from the discharge ports 5, 5, .

After a predetermined period of time has elapsed, the cleaning liquid is forcibly discharged from the drain pipe 13 by the drain pump 11 to the drain hose of the sink.

Upon completion of these steps, the process moves to the next step.

As in the steam cleaning pre-washing step, when water is supplied to a predetermined water level in the cleaning tank 2, the water supply is stopped and the heater 14 is energized to intensively and rapidly heat the water in the steam cover 15, generating steam.

This steam contacts the tableware and swells the starch and other residues.

When the main washing process starts after a predetermined time has elapsed, detergent is introduced into the washing tank 2, and at the same time the washing pump 7 starts working and the injection nozzle 4
A mixed cleaning solution of warm water containing detergent is sprayed from the discharge ports 5, 5, . . . to wash the tableware.

At this time, the jetting force from the discharge ports 5, 5, etc. should be strong enough (to the extent that the tableware is not destroyed), and the jetting force should be strong enough to hit the tableware evenly (the jetted liquid should hit the tableware evenly). Good cleaning effect.

However, the stronger the injection force, the louder the injection noise and the higher the operating noise.

After cleaning for a predetermined period of time, the cleaning pump 7 is stopped, the drain pump 11 is activated, and the cleaning liquid is discharged from the drain pipe 13.

Then move on to the subsequent process.

Rinse When the pre-washing process described above is completed, the drain pump 12 is still energized, so the fan 28E is connected to the pulley 28B.
, 28C and Bell) rotate through 28D.

Then, the water supply valve 25 to the heat exchanger 27 opens and the water supply valve 25 to the heat exchanger 27 opens.
The tap water flows through the check valve 28E, passes through the drain pipe 13, and is drained to the outside.

At the same time, the drying heater 2BH is also energized to start drying.

Cleaning tank 2 drawn in from the intake port 29 by fan 28E
The humid air inside is guided to the heat exchanger 27 through the duct 2B and dehumidified.

The cooled and dehumidified air is heated by the heater 2BH to become high-temperature air, and is led into the cleaning tank 2 through the exhaust port 29A to dry the tableware 30A etc. to be dried.
It is attracted by 8E.

By repeating this process, the tableware 30A in the washing tank 2 is dried.

The dehumidified water drops flow from drain pipe 28F to drain port 2.
It is sent to the bottom of the cleaning tank 2 through 8G, and is sent to the bottom of the water storage tank 2A.
The water is then drained to the outside by a drainage pump 11.

When the temperature of the circulating exhaust air reaches a set value or higher, the thermostat 36 installed in the duct 28A is turned off, the power supply to the drying heater 28H is stopped, and the temperature of the circulating air does not rise any further. .

FIG. 2 is a flowchart showing one embodiment of the present invention, in which after the rinsing process is completed, the drain pump motor 1
2 rotates, the fan 28E rotates, the water supply valve 25 to the heat exchanger 27 also energizes the drying heater 29H, the water supply valve 25 opens, water is supplied to the heat exchanger 27, and drying begins. .

Furthermore, the water supply valve 25 may be opened to cool the heat exchanger 27 during the drainage process.

FIG. 3 is a sectional view of a main part of another embodiment of the present invention, in which the heat exchanger 27 in FIG. 1 is cooled with water.
The one in Figure 3 is cooled with air.

That is, 37 is a motor that rotates the cooling fan 38;
Since the heat exchanger 27 is cooled by the rotation of the cooling fan 38, the circulating air sucked through the exhaust port 29 is cooled and dehumidified as it passes through the heat exchanger 27.

The motor 29 of the cooling fan 38 is energized when the drying cycle begins.

Furthermore, the fan 38 may be rotated during the drainage process.

As described above, the present invention circulates the internal air to dry and keep dishes warm, dehumidifies and heats them, and does not emit hot and humid air outside the dishwasher. The relative humidity inside the gas stove or cooking table does not increase, and the smell of food on the dishes does not escape into the room, making washing dishes much more enjoyable for the user. It is effective.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional schematic diagram of a dishwasher showing an embodiment of the invention, Fig. 2 is a flowchart 1-1 showing an embodiment of the invention, and Fig. 3 is a summary of another embodiment of the invention. FIG. 2...Cleaning tank, 27...Heat exchanger, 2
B, 28A...Circulation duct, 29...
...Intake port, 29A...Exhaust port.

Claims (1)

[Scope of utility model registration request] In a dishwasher in which dishes are placed in a washing tank and the dishes are washed with a spray nozzle, etc., the dishwashing tank has a door for putting the dishes, etc., an intake port and an exhaust port for circulating air, and an intake port and exhaust port for this washing tank. The air circulation path communicates with the mouth, and this air circulation path includes a blower fan, a heat exchanger, and a heating element, and the heat exchanger cools and dehumidifies the moisture in the circulating air to dry and retain heat. A dishwasher characterized by: