JP2968191B2 - Dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher configured to dry an object to be cleaned after the object to be cleaned is washed with cleaning water in a washing tank.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned dishwasher, as disclosed in, for example, JP-A-58-99942,
As the heating means, there is a configuration in which an electric heater that heats the inside of the cleaning tank when energized is arranged so as to be exposed at the bottom inside the cleaning tank.

[0003]

In the above-mentioned conventional configuration, since the electric heater is provided inside the cleaning tank, there are the following disadvantages and there is room for improvement. That is, the electric heater is configured to generate heat when energized to heat the air and the like in the cleaning tank, and the surface temperature of the heater becomes extremely high (several hundred degrees Celsius) during energization. After the power is turned off, a predetermined time is required until the temperature decreases.For example, when performing an operation of taking out a cleaning object such as tableware immediately after the drying step, the temperature is sufficiently lowered. There is a possibility that the user may approach his hand to the heater in a high-temperature state that is not in operation.

In addition, as described above, when the surface temperature becomes high, the heater is arranged at a predetermined distance or more from the inner surface of the cleaning tank, for example, the bottom and side surfaces, so that the inner surface is heated by the heat of the heater. It is necessary to prevent disadvantages such as discoloration and deformation beforehand.
There is a disadvantage that the effective capacity for installing the object to be cleaned is limited due to the space for arranging the heater with respect to the internal capacity of the cleaning tank.

The present invention has been made in view of such a point, and an object of the present invention is to ensure the safety in use while effectively drying the object to be cleaned. Another advantage is that the limited space inside the cleaning tank can be used as effectively as possible , and the cleaning water can be effectively heated.

[0006]

The features of the first invention are as follows.
After washing an object to be washed with washing water in a washing tank, in a dishwasher configured to dry the object to be washed, while supplying external air into the washing tank through an air supply path, Ventilation means for exhausting air inside the cleaning tank to the outside through an exhaust path, and heating means for heating air passing through the air supply path are provided, and the ventilation means is heated by the heating means. The cleaning unit is configured to supply the after-air to the cleaning tank.
Is the path of the water supply channel of the cleaning water supplied into the cleaning tank.
And an external heat source provided in the air supply passage.
Exchange heat between the heating medium supplied from the machine and the object to be heated.
And a heat exchanger for heating the washing water.
The air passing through the air supply passage is heated.
Is that

[0007] The characteristic structure of the second invention specifies a structure suitable for carrying out the first invention, and is provided in the cleaning tank.
There a washing operation means for executing a cleaning operation of the object to be cleaned, this
Control for controlling the operation of the washing operation means and the ventilation means
Means, and the control means comprises the cleaning operation means.
After the cleaning operation by the
The point is that it is configured to perform the work .

[0008]

[0009]

[0010]

[0011]

According to the characteristic structure of the first invention, when the object to be cleaned is dried after the object to be cleaned is washed by the cleaning water in the cleaning tank, the air supply path is started by starting the ventilation operation by the ventilation means. The outside air is supplied through the air passage. At this time, the air passing through the air supply passage is heated by the heating means, and the heated air is supplied into the cleaning tank. Then, the moist air containing a large amount of water in the cleaning tank in which the object to be cleaned is installed is exhausted to the outside through the exhaust path.

Therefore, since the heated and dried air is supplied into the cleaning tank and the humid air is exhausted, there is no need to install a heater or the like for heating the air inside the cleaning tank. In addition, the object to be cleaned can be effectively dried.

[0013] Since the wash water by the previous SL heating means is heated, there is no need to install a washing water heater for heating the inside the cleaning tank.

[0014] and the heating medium supplied from the external heat source apparatus, as the heated object, the heat exchange is performed between the air or the washing water is fed air through air supply passage, the air or wash water It will be heated.

Since the heating is performed by heat exchange with the heat medium as described above, for example, the heating is performed by an electric heater or the like having a high surface temperature (for example, several hundred degrees Celsius). In comparison, heating can be performed at a relatively low surface temperature and with a large amount of heat.

[0016] When the washing water through the feed water channel is supplied into the cleaning tank, the heating means provided in the middle path of the water supply passage, since washing water is heated by the heat medium of the heat, and heat a water supply Can be performed simultaneously.

After the washing with the washing water is completed, the air supplied through the air supply path with the ventilation by the ventilation means is heated by the heating means and supplied into the washing tank. .

According to the characteristic configuration of the second invention, the following operation is obtained in addition to the operation of the characteristic configuration of the first invention. The control means controls the cleaning operation means to execute the cleaning operation of the object to be cleaned, and after the cleaning of the object to be cleaned is completed, performs the ventilation operation of the ventilation means. Thus, the object to be cleaned is dried.

[0019]

According to the characteristic structure of the first invention, while the object to be cleaned can be effectively dried, there is no need to arrange a heater or the like in the cleaning tank, and the internal space of the cleaning tank is reduced. It can be used effectively without waste, and moreover,
Since there is no high-temperature heater or the like in the cleaning tank, the safety in use is improved.

[0020] without placing a heater or the like into the washing Kiyoshiso can effectively heat the wash water.

[0021] While are those that can be heated at atmospheric heard heat, the surface temperature of the heating means, a very high temperature (example, several hundred ° C) to become possible without, be smaller the gap between the surrounding member It is possible and can be stored compactly even in a narrow space outside the washing tank.

The supply of washing water into the washing Kiyoshiso, to be able to perform the heating of the washing water at the same time, after the water supply has been made of the washing water, compared to the structure for heating the washing water, the washing time Is shortened, and work efficiency can be improved. or,
By adopting a configuration in which the cleaning water and the air are heated by the same heating means, the configuration can be simplified as compared with the case where the heating means is separately provided.

According to the characteristic configuration of the second invention, the following effect is obtained in addition to the effect of the characteristic configuration of the first invention. Since the drying is automatically performed following the cleaning, after the cleaning operation is completed, for example, compared to a configuration in which the operation of the ventilation means is started by instructing the drying based on a manual operation, a cumbersome operation is unnecessary and work efficiency is improved. Can be improved.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dishwasher according to the present invention will be described with reference to the drawings. FIG. 2 shows a dishwasher according to the present invention. In this dish washer, a substantially rectangular box-shaped main body case 1 having an open front is provided with a door 2 which can swing open and close around a horizontal axis at a lower end portion. A closed washing tank 3 for washing an object to be washed is provided. Then, as shown in FIG.
The washing tank 3 is closed by the inner side surface of the door 2 by closing the door 2, and inside the closed washing tank 3, two upper and lower net baskets 5 a and 5 b slidably supported by a support rail 4 so as to be detachable. In a state in which items to be washed such as tableware are stored inside, a lower ejection nozzle 6a provided below the lower mesh basket 5a, a middle ejection nozzle 6b provided below the upper mesh basket 5b, and The washing object is washed by ejecting washing water from a large number of ejection holes 7 formed in each of the upper ejection nozzles 6c provided above the upper net basket 5b.

This dishwasher is provided with a washing operation means for executing an operation of washing an object to be washed in the washing tank. Hereinafter, the configuration of the cleaning operation means will be described. That is, as shown in FIG. 1, a water supply path 8 for supplying the cleaning water to the cleaning tank 3, a discharge path 9 for discharging the cleaning water in the cleaning tank 3 to the outside, and a cleaning stored in the cleaning tank 3. Transport path 1 for transporting water to each of the cleaning nozzles 6a, 6b, 6c
0 are connected to the washing tank 3. The water supply channel 8 is connected to the inside of the cleaning tank 3 in a state where the water supply path 8 is opened near the middle position in the vertical direction of the cleaning tank 3,
A manual opening / closing valve 11 which is set to a valve open state during operation and an electromagnetic water supply valve 12 are provided in the middle thereof.
When both the manual on-off valve 11 and the water supply valve 12 are opened, water is supplied into the washing tank 3 by the water supply pressure of a water supply source such as water supply. The discharge passage 9 is provided with an opening 1 formed at the bottom of the washing tank 3 by a drain pump 13 provided in the middle thereof.
The cleaning water is sucked from the cleaning tank 4 and the cleaning water is discharged to the outside from the discharge part 9b after passing through a vertical flow path portion 9a for preventing backflow provided on the side of the cleaning tank 3.

A water level sensor 15 for detecting whether or not the water level stored in the cleaning tank 3 when the water is supplied into the cleaning tank 3 has reached a set water level is provided. When the water supply is detected, the water supply valve 12 is closed and the water supply is automatically stopped.

The transfer path 10 is a suction transfer for suctioning the washing water stored in the washing tank 3 from the opening 14 by the operation of a circulation pump 16 as a forced transfer means provided in the middle of the transfer path. Road section 10a, circulation pump 16
A first transport path portion 10b forcibly transporting the wash water from the lower side to the lower ejection nozzle 6a;
And a second transport path portion 10c for forcibly transporting the wash water from the lower side toward the upper ejection nozzle 6c. The lower ejection nozzle 6a is rotatably supported around the longitudinal axis at the middle portion in the longitudinal direction with respect to the bottom surface of the washing tank 3, and the middle ejection nozzle 6b is
In contrast, it is configured to be rotatable around the vertical axis. The jet nozzles 6a, 6b, and 6c are configured such that the jet holes 7 jet the washing water obliquely upward and in opposite directions to each other. It is configured to rotate at a low speed around the core, and cleaning water is sprayed to every corner of the object to be cleaned, so that cleaning is performed effectively. still,
Upper ejection nozzle 6c is configured to jet the cleaning water at a location stationary relative cleaning tank 3, supplied from the washing water the water supply unit 6b ₁ ejected from the upper spray nozzle 6c for the medium ejection nozzle 6b It is configured to be. The cleaning operation means is configured by the above-described configuration.

As shown in FIGS. 4 and 6, a filter F is provided at the opening 14 at the bottom of the washing tank 3 for receiving dust such as residual vegetables generated by the washing action. As shown in FIGS. 6A and 6B, the filter F is composed of a coarse filter F1 having a coarse mesh and a fine filter F2 having a fine mesh, and at the time of washing, the washing water is provided after the coarse filter F1. The filter is configured to pass through F2, and at the time of discharge, the flow of the cleaning water is reversed, so that dust adhered to the inner surface of the fine filter F2 is removed and discharged.

As shown in FIG. 2, on the inner surface of the door 2,
A detergent input section 17 for storing a detergent and a dry finishing agent for cleaning in advance and feeding the detergent and the dry finishing agent into the cleaning tank 3 at an appropriate timing, and a dry finishing agent input section 18 are provided. ing. Each of these input sections 17, 18
Although not described in detail, in the state where the detergent or the like is stored, the leakage is prevented, and when the detergent is charged, the detergent is opened by the operation of the thermal valve so that the detergent or the like is charged into the cleaning tank 3. It is configured.

A heat exchanger 19 as a heating means is provided at an intermediate portion of the water supply passage 8 outside the washing tank 3. The heat exchanger 19 is configured to circulate and supply hot water as a heat medium from an external heat source device 20 through a hot water supply path 21, and heat of hot water (heat medium) supplied through the hot water supply path 21. The heat exchange is performed between the washing water passing through the water supply passage 8 and the washing water to heat the washing water. The hot water supply path 21 is configured so that hot water heated by the heat source device 20 and maintained at a constant temperature (about 80 ° C.) is circulated and supplied, and the hot water is supplied to the heat exchanger 19 through the hot water supply path 21. A switching valve 24 is provided which can be switched between a supply state of hot water to be supplied and a supply stop state in which hot water is short-circuited and circulated to the heat source device 20 through the bypass passage 23 to stop supply to the heat exchanger 19.

The heat exchanger 19 is, as shown in FIG.
The middle part of the water supply channel 8 is made larger in diameter than other parts,
The hot water supply passage 21 is wound in a coil shape around the outer peripheral portion of the large diameter portion 8a of the water supply passage 8 so as to be in contact with the outer peripheral surface of the water supply passage 8. It is configured such that heat exchange is effectively performed between hot water flowing through the hot water supply passage 21 and water flowing through the water supply passage 8.

After the cleaning operation with the cleaning water is completed and the cleaning water is discharged out of the cleaning tank 3, the heated air is supplied into the cleaning tank 3 and the cleaning tank 3 becomes wet. It is configured to exhaust air to the outside. That is, the outside air is sucked from the outside air suction portion 35 formed on the upper side of the door 2 through the air supply passage 36, and the sucked outside air is sucked through the air supply port 37 formed on the lower side of the cleaning tank 3. A ventilation fan 38 is provided as ventilation means for supplying air into the cleaning tank 3. On the other hand, as the outside air is forcibly sucked in by the ventilation fan 38, the air in the cleaning tank 3 flows through the exhaust port 39 and the exhaust path 40 formed in the upper part of the cleaning tank 3. It is configured to be exhausted to the outside of the apparatus from an exhaust part 41 provided above the door 2 and at a location separated from the outside air intake part 35.

Then, as shown in FIG.
The heat exchanger 19 is provided in the middle of the path of
The air passing through the inside 6 is configured to be heated by the heat of the hot water in the heat exchanger 19, and the heated air is configured to be supplied into the cleaning tank 3. ing.

Accordingly, the heat exchanger 19 has a function as a heating means for heating the cleaning water and a function as a heating means for heating the air supplied into the cleaning tank. .

Inside the washing tank 3, a door switch 27 for detecting whether or not the door 2 is in a closed state is provided.

The operation of each part of the washing operation means as described above, the control device 28 using a microcomputer as control means for controlling the ventilation operation by the ventilation fan 38, and the operation of instructing the control device 28 with control information Part 29
And are provided. The operation unit 29 is provided on the upper outer surface side of the door 2 and is a power switch 3 for instructing turning on and off of the power.
0, a start switch 31 for instructing the start of the cleaning operation,
A mode changeover switch 32 for changing the washing operation mode, a time setting switch 33 for switching and setting the drying time, and the like are provided. The mode changeover switch 32 is configured to be capable of switching to a standard operation mode as described later, a mode with a long or short cleaning time, a drying mode for performing only a drying operation, a mode for performing only a rinsing operation, and the like. ing.

Next, the control operation of the control device 28 in the standard operation mode will be described with reference to the flowcharts of FIGS. Prior to the start of the cleaning operation, the door 2 is opened, tableware and the like as objects to be cleaned are stored in the cleaning basket 3 in the net baskets 5a and 5b, and a dedicated detergent and a dry finishing agent are respectively supplied to the detergent charging section. 17. Drying agent input section 1
Load 8 When the door 2 is closed, the door switch 2
7 is turned on and set to a operable state (step 1). When the power switch 30 is turned on and the start switch 31 is turned on, the operation is started (steps 2 and 3). First, an operation of discharging the cleaning water from the cleaning tank 3 is performed (Step 4). That is, when the drainage pump 13 operates and the water level sensor 15 turns off, the drainage pump 13 stops. Next, the operation of supplying the cleaning water into the cleaning tank 3 is executed (step 5). That is, the water supply valve 12 is opened to supply the cleaning water into the cleaning tank 3, and the water level sensor 1
5 is turned on, and when it is detected that the set water level has been reached, the water supply valve 12 is closed.

Next, preliminary cleaning is performed (step 6).
That is, the circulating pump 16 operates for about one minute, and the cleaning water is jetted from each of the jet nozzles 6a, 6b, 6c to wash out rough dirt on the object to be cleaned. When the pre-cleaning is completed,
The washing water is discharged (step 7).

Next, the operation proceeds to the main cleaning step, in which the switching valve 2 is switched so that hot water is supplied from the heat source unit 20 to the heat exchanger 19.
After switching 4, the water supply operation is executed (steps 8 and 9). When the set water level is reached and the supply of water is stopped, the switching valve 2 is controlled so that the supply of hot water to the heat exchanger 19 is stopped.
4 to start the operation of the circulation pump 16 (steps 10 and 11). Further, a detergent is supplied from the detergent supply section (step 12). Then, the set time (about 26
(Minutes), the operation of the circulation pump 16 is stopped, and the washing water is discharged (steps 13, 14, 15).
In such a main cleaning process, heated cleaning water is jetted from the jet holes 7 in the form of spray to perform cleaning.
As described above, the lower and middle ejection nozzles 6a,
Numeral 6b is rotated around the vertical axis by the jetting power of the cleaning water, so that every corner of the object to be cleaned is surely cleaned.

Next, the operation proceeds to the rinsing washing step, and after water is supplied, the circulating pump 16 is operated for a set time (about 1 minute) to perform rinsing, and the washing water is discharged three times. When executed (Steps 16-2
0) At the time of the fourth rinse, the switching valve 2 is set so that the hot water is supplied from the heat source unit 20 to the heat exchanger 19.
4 is switched, and a water supply operation is executed (step 2).
1, 22). When the set water level is reached and the water supply operation ends,
The switching valve 24 is switched so that the supply of hot water to the heat exchanger 19 is stopped, the operation of the circulation pump 16 is started, and the rinsing with hot water is performed (steps 23 and 2).
4). When the hot water rinsing is continued for a set time (about 25 minutes), a dry finish is supplied (steps 25 and 26). When the hot water rinsing is continued for a set time (about 30 minutes), the rinsing is terminated and the cleaning water is discharged (steps 27 and 28).

Next, the process proceeds to the drying step, and the switching valve 24 is supplied so that hot water is supplied from the heat source unit 20 to the heat exchanger 19.
At the same time, the ventilation operation of the ventilation fan 38 is started (steps 29 and 30) to supply heated air (warm air) into the cleaning tank 3 and to remove humid air from the cleaning tank 3 to the outside. And the object to be cleaned is dried. Then, when such a drying operation elapses the drying set time set by the time setting switch 33, the switching valve 24 is switched so that the supply of hot water to the heat exchanger 19 is stopped, and the ventilation fan 38 is used. The ventilation operation is stopped, and the drying process ends (steps 31 and 32). After 10 minutes, the operation switch 30 is automatically turned off (steps 33 and 34).

Although the above-described operation has been described in the case of the standard operation mode, in the other operation modes, the cleaning times are set to different states. In the case of the rinsing mode, only the rinsing step is performed, and in the case of the drying mode. Has a configuration in which only the drying step is performed.

[Other Embodiments] (1) In the above embodiment, a case was described in which a ventilation fan as ventilation means was provided in the air supply path. May be configured so that outside air is sucked into the cleaning tank through the air supply path by setting the pressure to a negative pressure.

[0044]

(2) In the above embodiment, the heat exchanger 19
However, the configuration is such that the hot water supply channel 21 is arranged in a coiled state around the outer periphery of the water supply channel 8, but is not limited to such a configuration. A closed tank through which the water passes is provided.
May be configured to pass therethrough to increase the contact area between the water supply channel and the hot water.

[0046]

[0047]

(3) In the above embodiment, the operation of both the cleaning operation means and the ventilation fan is automatically controlled by the control device. However, instead of such a configuration, a command is issued based on, for example, a manual operation. It is good also as a structure made to operate with.

(4) In the above embodiment, the air supply port 37 through which the outside air is sucked into the cleaning tank 3 is simply formed as an opening. However, the air is sucked into the air supply portion of the air supply port 37. So that outside air diffuses into a large area inside the washing tank,
A louver (diffusion member) may be provided.
The air supply port may be formed at a plurality of locations to dry efficiently.

(5) In the above-described embodiment, the cleaning operation means is configured such that the cleaning water is jetted from the jet nozzle to wash the object to be cleaned. The cleaning water may be stored in the cleaning water, and the cleaning water may be swirled and swirled to perform cleaning.

Incidentally, reference numerals are written in the claims to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a dishwasher.

FIG. 2 is an overall perspective view of a door opened state.

FIG. 3 is an overall perspective view of a door closed state.

FIG. 4 is a perspective view of a drain section.

FIG. 5 is a side view of the heat exchanger.

FIG. 6 is a sectional view of a drainage section.

FIG. 7 is a flowchart of a control operation.

FIG. 8 is a flowchart of a control operation.

[Explanation of symbols]

 Reference Signs List 3 washing tank 8 water supply path 19 heating means 20 external heat source unit 28 control means 36 air supply path 38 ventilation means 40 exhaust path

──────────────────────────────────────────────────続 き Continuing on the front page (72) Junichi Kitamura 1-1-52, Minami-shioka, Minato-ku, Osaka-shi, Osaka Prefecture Inside Herman Co., Ltd. (72) Makoto Sano 1-1-52, Minami-shioka, Minato-ku, Osaka-shi, Osaka No. Harman Co., Ltd. (72) Inventor Jun Nakamura 1-1-52 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka (56) References JP-A-4-187133 (JP, A) JP-A-4- 279138 (JP, A) JP-A-6-327606 (JP, A) JP-A-8-98797 (JP, A) JP-A-6-205735 (JP, A) JP-A-5-154084 (JP, A) JP-A-6-22894 (JP, A) JP-A-8-33602 (JP, A) JP-A-6-86751 (JP, A) JP-A-9-28649 (JP, A) JP-A-59-183878 (JP, A) JP-A-3-191940 (JP, A) 6-13756 (JP, U) JP 6-24668 (JP, U) JP 6-55556 (JP, U) JP 54-56277 (JP, U) JP 57-40907 (JP) , Y2) (58) Field surveyed (Int.Cl. ⁶ , DB name) A47L 15/42 A47L 15/46 A47L 15/48

Claims (2)

(57) [Claims] 1. A dishwasher configured to wash an object to be washed in a washing tank (3) with washing water and then to dry the object to be washed, wherein the dishwasher is externally connected through an air supply passage (36). Air of the washing tank (3)
Ventilation means (38) for supplying air to the inside and exhausting the air inside the washing tank (3) to the outside through an exhaust path (40), and heating for heating the air passing through the supply path (36) means (19) are provided, said ventilation means (38) is composed of air after being heated by said heating means (19) so as to supply air to the washing tub (3) inside, said heating The means (19) includes a water supply passage (8) for the cleaning water supplied into the cleaning tank (3).
In the middle of the route and in the air supply passage (36).
The heat medium supplied from the external heat source unit (20)
It consists of a heat exchanger that exchanges heat with the heating object,
The washing water is heated and passed through the air supply passage (36).
A dishwasher configured to heat the passing air . 2. An object to be cleaned in said cleaning tank (3).
Cleaning operation means for performing a cleaning operation, and controlling operation of the cleaning operation means and the ventilation means (38).
Control means (28) for controlling the cleaning operation by the cleaning operation means.
After the operation is completed, the ventilation operation of the ventilation means (38) is performed.
The dishwasher according to claim 1, wherein the dishwasher is configured to execute .