JP2968190B2 - 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, and more particularly, to a dishwasher provided with a heating means for heating the inside of 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,
The heating means is constituted by an electric heater that heats the inside of the cleaning tank when energized, and the electric heater is exposed at a lower portion of the cleaning tank in order to efficiently heat the inside of the cleaning tank. Had been arranged.

[0003] In the step of cleaning an object to be cleaned such as tableware with cleaning water, the heater functions to heat the cleaning water in order to facilitate drying after cleaning, and the cleaning step is completed. In the drying step after the washing water is discharged to the outside, the inside of the washing tank is heated to perform the function of drying the object to be washed.

[0004]

In the above-mentioned conventional structure, the use of an electric heater has the following disadvantages, and there is room for improvement. In other words, since the electric heater is configured to generate heat when energized and heat the cleaning water, the air in the cleaning tank, and the like,
During energization, the surface temperature of the heater becomes extremely high (several hundred degrees Celsius), and after the energization is stopped, it takes a predetermined time until the temperature decreases. For example, when performing the operation of taking out the object to be cleaned, there is a possibility that the user may approach his / her hand to the heater in a high temperature state where the temperature has not sufficiently decreased.

In addition, as described above, since the surface temperature of the heater becomes extremely high, in the drying step,
The temperature in the washing tank (air temperature) rises. As a result, for example, in a cleaning target such as a cleaning target made of a synthetic resin or a lacquer ware, the shape is deformed or the coating is peeled off due to a high temperature. Inconveniences such as this may occur.

Further, as described above, when the surface temperature becomes high, the heater is disposed at a distance more than a set distance 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, so the effective capacity for installing the object to be cleaned for the space for the heater is limited with respect to the internal capacity of the cleaning tank. There was a disadvantage.

Therefore, in order to avoid disadvantages caused by using such an electric heater, a cleaning tank is provided with:
A configuration is conceivable in which a pipe through which water can flow is installed, heated water flows through the pipe, and the inside of the cleaning tank is heated by the heat of the hot water flowing through the pipe. .

However, even in such a configuration, a separate pipe is provided inside the cleaning tank, and a space for installing the pipe is necessary, and the object to be cleaned is provided. But still has the disadvantage that the effective capacity for
There is room for improvement.

The present invention has been made in view of such a point, and an object of the present invention is to effectively heat the inside of the cleaning tank while avoiding the disadvantage of using the electric heater as described above. It is another object of the present invention to provide a dishwasher capable of making the most of a space in a washing tank as much as possible.

[0010]

The features of the first invention are as follows.
The cleaning tank is composed of a plurality of layers.
A hot water passage through which hot water flows is formed between the side layer and the inner layer.
Then, the hot water is supplied and supplied, so that the inside of the washing tank is
The point is that a hot water heater for heating is provided .

[0011]

A feature of the second aspect of the present invention is to specify a configuration suitable for implementing the first aspect of the present invention , and a partition for forming the hot water passage between the outer layer and the inner layer. Is provided.

A feature of the third aspect of the present invention is to specify a preferred configuration for implementing the first aspect of the present invention. The feature for forming the runner in at least one of the outer layer and the inner layer is provided. A groove is formed, and the outer layer and the inner layer are joined at a portion other than the groove forming portion.

[0014] The characteristic structure of the fourth invention is the first, the second or the second.
A third aspect of the present invention specifies a configuration suitable for carrying out the invention , wherein the hot water heater is formed over substantially the entire bottom surface of the cleaning tank.

[0015] The characteristic structure of the fifth invention is the first, second and third aspects.
Alternatively, the present invention specifies a configuration suitable for carrying out the fourth invention , and is characterized in that the hot water path is constituted by a series of meandering paths.

[0016]

According to the characteristic structure of the first aspect of the present invention, since the inside of the cleaning tank is heated by the heat of the hot water when the hot water is supplied to the hot water heater by flowing the hot water, the heating in the electric heater is not required. As described above, a large-capacity electric wiring and the like become unnecessary, and the surface temperature of the heater does not become 100 ° C. or more, and the temperature becomes high enough to adversely affect the inner surface of the cleaning tank and the object to be cleaned. Absent.

Further, since the hot water heater is formed integrally with the cleaning tank, a space for installation can be reduced as compared with a case where the heater is separately provided in the cleaning tank. In addition, troublesome work such as mounting a separate heater in a limited space in the cleaning tank is not required.

[0018] Further , by combining the outer layer and the inner layer, which are constituent members of the cleaning tank, a hot water passage through which hot water flows is formed between the outer layer and the inner layer. It is possible to easily produce the cleaning tank without forming a long passage for hot water to flow through the material of the cleaning tank, or without requiring a special process at the time of molding the mold.

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 . Since the partition portion is provided between the outer layer and the inner layer, a hot channel for flowing hot water is formed by the partition portion. There is no need to perform any processing. Further, a heat transfer function for heating the inside of the cleaning tank can be exhibited in a wide area other than the partition portion.

According to the characteristic configuration of the third invention , the following operation is obtained in addition to the operation of the characteristic configuration of the first invention . A groove for forming a runner is formed in one or both of the outer layer and the inner layer, and the outer layer and the inner layer are joined at a flat portion other than the groove forming portion, so that cleaning is performed. A tank is configured. Therefore, it is possible to securely join the layers at a flat portion other than the concave groove forming portion.

According to the characteristic configuration of the fourth invention , the first and the second
Alternatively, there is the following effect in addition to the effect of the characteristic configuration of the third invention . Since the hot water heater is formed over almost the entire bottom surface of the cleaning tank, the inside of the cleaning tank can be heated substantially evenly, and the heat transfer area of the hot water heater to the inside of the cleaning tank increases, thereby increasing the heating capacity. it can.

According to the fifth feature of the invention , the first and the second
The following operation is obtained in addition to the operation according to the second, third or fourth aspect of the invention . Since the hot water heater is provided with a series of flow paths bent in a meandering shape, for example, the hot water heater is concentrated on a part of the portion as compared with a configuration in which the hot water is branched into a plurality of parallel paths and the hot water flows therethrough. There is no disadvantage such as a short-circuit flow, and the flow can be made even in almost all regions.

[0023]

According to the characteristic structure of the first invention, while the inside of the cleaning tank can be effectively heated, the surface temperature of the heater does not become extremely high, and the object to be cleaned can be taken in and out. Even if the user approaches his hand, the danger is low, the safety in use is improved, and disadvantages such as the object to be washed being deformed by high heat and paint peeling off are avoided. It becomes possible.

Moreover, a dedicated space for installing the hot water heater is small, and the effective volume for storing the object to be cleaned in the cleaning tank can be increased accordingly. In addition, the time and labor required for mounting are reduced, and the production is facilitated.

Also, with a reasonable configuration, a hot water heater integrally formed with the cleaning tank can be easily manufactured.

According to the feature configuration of the second invention , the following effect is obtained in addition to the effect of the feature configuration of the first invention . The outer layer and the inner layer, which are large members, do not need to be subjected to special processing for forming a hot channel, which facilitates the production and increases the ratio of a region exhibiting a heat transfer function on the inner surface of the cleaning tank. ,
As a result, the heat transfer efficiency can be increased.

According to the characteristic configuration of the third invention , the following effect is obtained in addition to the effect of the characteristic configuration of the first invention . The inner and outer layers can be securely joined together, and there can be little risk of hot water leaking out.

According to the characteristic structure of the fourth aspect, the first and second aspects are provided.
Alternatively, the following effect is obtained in addition to the effect of the characteristic configuration of the third invention . The inside of the cleaning tank can be almost uniformly heated by the large heating capacity, and the heating efficiency is high.

According to the characteristic structure of the fifth aspect, the first and the second
There are the following effects in addition to the effects of the features of the second, third or fourth invention . Hot water can be reliably heated in a state where the temperature difference is small in almost all areas of the hot water heater without short-circuit flow of hot water.

[0030]

Embodiments will be described below with reference to the drawings. FIG.
1 shows a dishwasher according to the present invention. This dishwasher has a substantially rectangular box-shaped main body case 1 with an open front.
And a door 2 that can swing open and close around a horizontal axis at a lower end portion, and a closed washing tank 3 for washing an object to be washed such as tableware is provided inside the main body case 1. . And
As shown in FIG. 3, by closing the door 2, the cleaning tank 3 is closed by the inner surface of the door 2, and the closed cleaning tank 3 is closed.
Inside, the lower net basket 5 is placed in a state in which objects to be washed such as tableware are stored in two upper and lower net baskets 5a and 5b which are detachably slidably supported by the support rails 4.
a, a lower ejection nozzle 6a provided below the upper mesh basket 5b, and a middle ejection nozzle 6b provided below the upper mesh basket 5b, and an upper ejection nozzle 6c provided above the upper mesh basket 5b. The cleaning water is jetted from a large number of jetting holes 7 formed in the nozzles to wash the object to be cleaned.

As shown in FIG. 1, this dishwasher has:
A water supply path 8 for supplying cleaning water to the cleaning tank 3; a discharge path 9 for discharging cleaning water in the cleaning tank 3 to the outside;
The cleaning water stored in the cleaning nozzles 6a, 6b,
Each of the transport paths 10 for transporting up to 6c is provided so as to be connected to the cleaning tank 3. The water supply channel 8 is connected to the inside of the washing tank 3 in a state of being opened near the middle position in the vertical direction of the washing tank 3, and a manual opening / closing valve 11 which is set to be open during operation is provided in the middle thereof. And an electromagnetic water supply valve 12. Manual open / close valve 11 and water supply valve 1
When both valves 2 are opened, water is supplied into the washing tank 3 by the water supply pressure of a water supply source such as a water supply. The discharge path 9 is
Wash water is sucked from an opening 14 formed at the bottom of the washing tank 3 by a drain pump 13 provided in the middle of the washing tank 3, and a vertical path portion for preventing backflow provided on a lateral side of the washing tank 3. The cleaning water is discharged to the outside from the discharge part 9b after passing through 9a.

A water level sensor 15 is provided for detecting whether 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, and the water level sensor 15 is turned on to reach the set water level. 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 sucking the washing water stored in the washing tank 3 from the opening 14 by the operation of a circulation pump 16 provided 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. Therefore, the transport path 10, the circulation pump 16, and the ejection nozzles 6a, 6
The cleaning operation means S is constituted by b and 6c.

As shown in FIG. 6, a filter F is provided at the opening 14 at the bottom of the cleaning tank 3 for receiving dust such as residual vegetables generated by the cleaning 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. It is configured to pass through F2, and upon discharge, the flow of the washing water is reversed,
The dust adhering 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.

At the bottom of the washing tank 3, the washing water supplied to the washing tank 3 is heated in the washing step, and the air inside the washing tank 3 is heated in the drying step after the washing water is discharged. A heater 19 is provided. The heater 19 is configured by a hot water heater 19 that heats hot water heated by an external heat source device 20 by flowing the hot water through a hot water supply path 21.

As shown in FIG. 4, the hot water heater 19 is provided at the bottom of the cleaning tank 3 over substantially the entire bottom surface of the cleaning tank 3 and provided with a series of meandering bent flow paths. Have been. The hot water heater 19 is formed integrally with the cleaning tank 2. That is, as shown in FIG. 5, the bottom surface 3a of the cleaning tank 3 has a two-layer structure, the outer layer Pu is formed of a flat plate, and the inner layer Pi is continuously connected to the groove. 40 are formed,
The outer layer Pu and the inner layer Pi are bonded to each other in a flat surface area 41 other than the groove forming portion. Therefore, wash
The cleaning tank 3 is composed of a plurality of layers.
Between the outer layer Pu and the inner layer Pi,
In addition, the hot water channel 42 through which the hot water flows is formed,
Hot water that heats the inside of the cleaning tank 3 by being supplied
The heater 19 is provided.

The hot water supplied from the heat source unit 20 through the hot water supply path 21 flows through the hot water heater 19 and then circulates through the return path 22 to the heat source unit 20.
The return path 22 is provided with a branch path 23 connected to the discharge path 9. The hot water supplied from the heat source device 20 is configured to be constant at a temperature of about 80 ° C.

The hot water supply passage 21 has an electromagnetic open / close hot water valve 2.
4 is provided, and a branch passage 23 is provided with a discharge valve 25 of an electromagnetic opening / closing type.
Is provided. By opening the hot water valve 24 and closing the discharge valve 25, hot water can be supplied to the hot water heater 19, and by closing the hot water valve 24 and opening the discharge valve 25, hot water can be supplied. The supply of the hot water to the heater 19 is stopped. Therefore, the hot water valve 24 and the discharge valve 25 constitute a heating adjusting unit K for changing and adjusting the heating state of the hot water heater 19.

A temperature sensor 26 as temperature detecting means for detecting the temperature in the cleaning tank 3 and a door 2
Door switch 2 for detecting whether or not the door is closed
7 are provided.

A control device 28 using a microcomputer as control means for controlling the operation of each unit as described above, and an operation unit 29 for instructing the control device 28 with control information are provided. The operation unit 29 is provided on the upper outer surface side of the door 2 and includes a power switch 30 for instructing power on / off, and a start switch 3 for instructing start of the cleaning operation.
1. Mode changeover switch 3 for changing the cleaning operation mode
2. A time setting switch 33 for changing and setting the drying time is provided. The mode changeover switch 32 is configured to be able to switch between a standard operation mode, a course having a long or short cleaning time, a mode in which only a rinsing operation is performed, and a mode in which only drying is performed, as will be described later.

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 Then, when the door 2 is closed, the door switch 27 is turned on, so that the door 2 is set in an operable state (step 1). The power switch 30 is turned ON, and
When the start switch 31 is turned on, the operation starts (steps 2 and 3). First, the washing water in the washing tank 3 is discharged (step 4). That is, the drain pump 13
Is activated and the water level sensor 15 is turned off.
3 stops. Next, cleaning water is supplied into the cleaning tank 3 (step 5). That is, when the water supply valve 12 is opened and the water level sensor 15 is turned on to detect that the water level has reached the set water level, 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 preliminary cleaning is completed, the cleaning water is discharged (Step 7).

In the next main cleaning step, after water is supplied, the circulation pump 16 is operated, and the hot water heater 1 is turned on.
9 through hot water of about 80 ° C (steps 9 and 1).
0). Also, the detergent is introduced from the detergent introduction section (step 11). The hot water supply state is adjusted by controlling the operation of the hot water valve 24 and the discharge valve 25 so that the detection value of the temperature sensor 26, that is, the temperature in the cleaning tank 3 is maintained at about 60 ° C. (step 12). Then, when the set time (about 26 minutes) elapses, the operation of the circulation pump 16 is stopped, hot water is stopped from flowing to the hot water heater 19, and the washing water is discharged (steps 13, 14, 15). In such a main cleaning process, the cleaning water jetted in the form of spray from the jet holes 7 comes into contact with the hot water heater 19 to be efficiently heated, and the cleaning is performed with the hot water. Further, as described above, the lower and middle jet nozzles 6a and 6b rotate around the vertical axis with the jetting power of the washing water so that every corner of the object to be washed is surely washed. Has become.

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 washing, and the washing water is discharged three times. When executed (Steps 16-2
0) At the time of the fourth rinse cleaning, after water is supplied, the hot water is passed through the hot water heater 19, and the rinse cleaning with hot water is performed (steps 21, 22, 23). At this time, the heating state by passing hot water is adjusted and controlled so that the detection value of the temperature sensor 26 is maintained at about 70 ° C. If such hot water rinse is continued for a set time (about 25 minutes), drying is performed. Finishing agent is supplied (steps 24, 24, 26). When the hot water rinsing is continued for a set time (about 30 minutes), the rinsing is completed and the cleaning water is discharged (steps 27 and 28).

Next, the process proceeds to the drying step, where the hot water is passed through the hot water heater 19, and the heating state by the hot water is adjusted and controlled so that the detection value of the temperature sensor 26 is maintained at about 70 ° C. (steps 29 and 30). ), The air in the cleaning tank 3 is heated to about 70 ° C., and the object to be cleaned is dried. When such a drying operation elapses for a set time (about 20 minutes), hot water supply is stopped and the drying process is completed (steps 31 and 32). The set time for this drying is set by the time setting switch 33.
It can be changed to about 40 minutes. When about 10 minutes have passed after the drying step, the power switch 30 is automatically switched to the OFF state, and the operation is completed (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, and in the case of the drying mode, only the above-described drying step is executed, and the rinsing mode is performed. In this case, only the rinsing step is performed.

[Other Embodiments] (1) In the above embodiment, the case where only the bottom surface of the cleaning tank 3 has a two-layer structure and the hot water heater 19 is formed between the inner and outer layers has been exemplified. Not limited to this, for example, a configuration in which the hot water heater 19 is provided on the side surface, the ceiling surface, or the like of the cleaning tank may be used. In short, any configuration that heats the inside of the cleaning tank 3 may be used.

(2) In the above embodiment, only the inner layer Pi of the inner layer Pi and the outer layer Pu constituting the cleaning tank 3 is
Although the configuration is such that the concave groove 40 is formed and the configuration is such that bonding is performed in a flat surface region other than the concave groove forming portion, the present invention is not limited to such a configuration. For example, as shown in FIG.
A concave groove 40 may be formed in each of i and Pu. As shown in FIG. 10, a partition 43 made of a narrow ridge is formed in the middle of the flat surface area, and this partition 43 is formed. A wide hot water passage 42 may be formed in the gap between the inner and outer layers. With such a configuration, a heating function using hot water is exhibited in a wide area on the inner surface of the cleaning tank 3, and the heat transfer area is increased, and the heating efficiency is improved.
Further, as shown in FIG. 11, each of the inner and outer side layers Pi and Pu is formed of a flat plate body, and a band-shaped partition portion 43 for forming a hot channel 42 is interposed between them. And may be configured to be joined. By doing so, there is no need for bending molding, and the fabrication can be performed more easily.
Further, instead of the cleaning tank having a two-layer inner / outer structure, 3
It is good also as composition which comprises a multilayer structure of more than a layer, and a hot water heater is provided between each layer.

(3) In the above embodiment, the hot water heater 1
9 illustrates an example in which a series of flow paths bent in a meandering shape is provided. In this case, the hot water supplied from the heat source device 20 is surely flowed and supplied to each path portion. Therefore, there is an advantage that the heating distribution in the cleaning tank 3 becomes substantially uniform. However, instead of such a configuration, a configuration in which one or a plurality of parallel branch paths are formed may be used.

(4) In the above embodiment, the heating adjustment by the hot water heater 19 is performed by switching the hot water heated to a predetermined temperature to a state of flowing to the hot water heater 19 and a state of not flowing. During the cleaning operation, the supply of the hot water from the heat source unit 20 can be continued, and the control such as the operation start / stop of the heat source unit 20 itself is not executed every time the hot water heater 19 operates. Hot water heater 1
9 can be adjusted, but the heat source unit 20 is configured so that the hot water temperature can be adjusted, and the temperature of the supplied hot water is adjusted so that the inside of the cleaning tank 3 has a desired temperature for reaching the target temperature. You may implement as a structure which performs temperature adjustment.

(5) In the above embodiment, the heating water heater 19 is adjusted so that the temperature inside the cleaning tank 3 becomes the target temperature, that is, so-called feedback control is executed. The temperature may be adjusted by feedforward control that adjusts the hot water temperature to be adjusted to an appropriate temperature.

(6) In the above embodiment, the cleaning water is heated by the hot water heater 19 in the cleaning step and the air in the cleaning tank 3 is heated in the drying step. The cleaning operation may be performed by natural drying, and the cleaning water may be heated by another heating unit in advance, and only the drying operation may be performed by the hot water heater 19. It may be configured.

(7) In the above-described embodiment, the cleaning operation means is configured such that the cleaning water conveyed by the circulation pump 16 is jetted from the jet nozzle to wash the object to be cleaned. In addition, various types of cleaning operation means may be used, such as a type in which the cleaning water stored in the cleaning tank 3 is swirled to perform cleaning.

(8) In the above embodiment, the heat source device 20 is provided as the hot water supply means for the hot water heater 19. For example, a tank for storing the heated hot water is provided, and the hot water is manually supplied to the tank. Into the hot water heater 19 by natural flow from the tank.

In the claims, reference numerals are provided for facilitating comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a door open state.

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

FIG. 4 is a diagram showing an arrangement state of a hot water heater.

FIG. 5 is a sectional view of a hot water heater.

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

FIG. 7 is a flowchart of a control operation.

FIG. 8 is a flowchart of a control operation.

FIG. 9 is a sectional view of a hot water heater according to another embodiment.

FIG. 10 is a sectional view of a hot water heater according to another embodiment.

FIG. 11 is a sectional view of a hot water heater according to another embodiment.

[Explanation of symbols]

 3 Cleaning tank 3a Bottom surface 19 Hot water heater 40 Groove 42 Runway 43 Partition part Pi inner layer Pu outer layer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Sano 1-15-1 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture Inside Harman Corporation (72) Junichi Kitamura 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka No. Harman Co., Ltd. (72) Inventor Jun Nakamura 1-152 Oka, Minami-ku, Minato-ku, Osaka-shi, Osaka (56) References JP-A-59-183878 (JP, A) JP-A-2- 309924 (JP, A) JP-A-56-149542 (JP, A) JP-A-3-191940 (JP, A) JP-A-6-86751 (JP, A) JP-A-9-24013 (JP, A) Japanese Utility Model Showa 54-130376 (JP, U) Japanese Utility Model Showa 54-56277 (JP, U) Japanese Utility Model Showa 56-1565 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47L 15/42

Claims (5)

(57) [Claims] 1. A washing tank (3) comprising a plurality of layers,
The outer layer (Pu) and the inner layer (P
A hot water path (42) through which hot water flows is formed between
The hot water is supplied through the washing tank
(3) A hot water heater (19) for heating the inside is provided.
That the dishwasher. 2. An outer layer (Pu) and an inner layer (P).
2. The dishwasher according to claim 1 , wherein a partition (43) for forming the hot water path (42) is provided between the dishwasher and i). 3. 3. An outer layer (Pu) and an inner layer (P).
A groove (40) for forming the runner (42) is formed in at least one of i), and the outer layer (Pu) and the inner layer (Pi) are formed in the groove (40). )
In portions other than the formation portion, claim 1, which is joined
Dishwasher as described. Wherein said hot-water heater (19) is approximately dish washer according to claim 1, wherein are formed over the entire surface of the bottom surface (3a) in the washing tub (3). Wherein said water passage (42) dishwasher according to claim 1, 2, 3 The 4 described are constituted by tortuous path leading to the series.