JP2005304619A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher in which heating time is shortened by saving heating energy required for generating steam. <P>SOLUTION: A control circuit drives a heater and a pump motor alternately after opening a water valve and supplying water in a washing tub to a water level for generating steam. Then, water injected from an injection nozzle is guided to the heater and comes in contact therewith. The water in contact with the heater instantly evaporates since a surface temperature of the heater is high. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dishwasher having a steam generating function.

  Household dishwashers use a washing pump to pump up washing water stored in a washing tank and spray it from an injection nozzle to wash away stains on tableware. In addition, a dishwasher has been proposed in which a pre-washing process called a steam process is executed before the washing process so that dirt stuck to the tableware can be washed away by washing water jetted from the jet nozzle.

In the steam process, steam stored in a washing tank or a water storage container provided in the washing tank is heated by a heater to generate steam, and the dirt stuck to the tableware is swollen.
JP-A-2-82930 JP-A-5-76472 JP-A-5-84216

  However, the conventional dishwasher is configured to energize the heater while the heater is submerged. Therefore, in order to generate steam, the heater must be energized until the total amount of water stored in the washing tank or the water storage container is close to 100 ° C. For this reason, it is necessary to heat a large amount of water compared to the amount of steam generated, and there is a problem that the heating energy is wasted and the heating time is lengthened accordingly.

  This invention is made | formed in view of the said situation, The objective is to provide the dishwasher which can aim at shortening of heating time, suppressing the heating energy required for vapor | steam production | generation small.

  The dishwasher according to the present invention has a washing tank for storing tableware, a heat source disposed in the washing tank, a water supply device for supplying water into the washing tank, and water supplied into the washing tank by the water supply device. Is provided with water guiding means that guides and contacts the heat source, and the steam generating means is configured to generate steam by controlling the water supply device, the heat source, and the water guiding means.

  In this case, as a method of bringing the heat source into contact with water, a pump means and spray nozzles for spraying the washing tub on the tableware, and a method of inducing and contacting water sprayed from the spray nozzle to the heat source, water supply A method of inducing water flowing out of the mouth into the washing tank to a heat source and bringing it into contact with the heat source is conceivable.

  In this invention, the water supplied in a washing tank is made to contact a heat source, and the said water is heated. That is, when the steam is generated, the heat source is not immersed in the water, but the water necessary for generating the steam is brought into contact with the heat source, and the water is heated by the heat source. For this reason, the amount of water heated by the heat source can be reduced as much as possible, and the heating time necessary for evaporating the water can be shortened.

Several embodiments in which the present invention is applied to a household dishwasher will be described below.
1 to 6 show a first embodiment of the present invention. 1 to 3, a dishwasher 1 includes a washing machine body 3 having a washing tank 2 therein, and a lower door 4 provided on the front surface of the washing machine body 3 for opening and closing a front opening of the washing tank 2. And an upper door 5 and an operation panel 6 provided below the lower door 4. The operation panel 6 is provided with various switches and a display unit.

  The doors 4 and 5 are pivotally supported by the washing machine body 3 at the upper end and the lower end, respectively, and are configured to rotate in conjunction with each other via a link mechanism (not shown). A push button 7 for opening the doors 4 and 5 is provided on the front surface of the lower door 4. Both doors 4 and 5 are opened by pressing the push button 7 and pulling the lower door 4 forward. The upper door 5 is provided with an exhaust port 8 for discharging water vapor in the cleaning tank 2.

  Inside the washing tub 2, two upper and lower tableware baskets 18 and 19 are accommodated in a removable manner. In addition, an injection nozzle 20 is fixed at the back of the cleaning tank 2. The injection nozzle 20 is composed of a band-shaped hollow member 20 a extending left and right along the inner surface of the cleaning tank 2 and a plurality of injection holes 20 b formed on the front surface thereof. A cylindrical portion 21 extending to the lower portion of the cleaning tank 2 is integrally provided in the middle of the hollow member 20a. Further, two rotary spray nozzles 22 are provided side by side at the lower part in the cleaning tank 2. The injection nozzle 22 includes a hollow arm portion 22a and a plurality of injection holes 22ba formed on the upper surface thereof. The base end portion of the arm portion 22 a is rotatably connected to the arm support 23.

  A water reservoir 24 is integrally provided at the left front portion of the bottom of the cleaning tank 2, and a sheathed heater 25 as a heat source is disposed at the right front portion. As shown in FIG. 4, the sheathed heater 25 has a substantially rectangular cross section, and is arranged so that the upper surface 25a thereof is substantially horizontal. Further, as shown in FIGS. 1 to 3, a removable residual filter 26 is disposed on the water reservoir 24. Further, a protective cover 27 made of a perforated plate is put on the sheathed heater 25.

  A pump 28 that also serves as a cleaning pump and a drainage pump and a blower 29 are disposed below the cleaning tank 2 in the cleaning machine main body 3. Although not described in detail, the pump 28 includes a casing 28a that houses a cleaning impeller and a drain impeller (both not shown), and a pump motor 30 that rotationally drives the cleaning and drain impeller (FIG. 5). Only shown). When the motor 30 rotates in one direction, for example, the pump 28 functions as a washing impeller and does not function as a drain impeller. On the other hand, when the motor 30 rotates in the other direction, the draining impeller functions, and the cleaning impeller does not function. That is, the pump 28 is configured to be switchable between a state that functions as a cleaning pump and a state that functions as a drainage pump by switching the rotation direction of the motor 30.

  A cleaning discharge port (not shown) is provided in the upper portion of the casing 28a, and the discharge port is connected to the arm support 23 and the cylindrical portion 21 through water distribution pipes 31a and 31b, respectively. A discharge port (not shown) for drainage is provided on the side of the casing 28a, and a drain hose 32 is connected to the discharge port. The drain hose 32 is drawn out from the lower part of the rear part of the washing machine body 3 through a position higher than the highest water level in the washing tank 2.

  A cylindrical portion 33 is provided at the lower portion of the casing 28a. The tubular portion 33 is connected to the lower end portion of the water storage portion 24 through a connecting pipe 34. Although not shown in the drawing, a suction port for cleaning and discharging is formed in a portion of the lower portion of the casing 28a located in the cylindrical portion 33. On the other hand, the inside of the connecting pipe 34 is divided into a cleaning water channel and a drainage channel, the end of the cleaning water channel communicates with the suction port for cleaning, and the end of the drainage channel communicates with the suction port for drainage. doing.

  When the pump 28 functions as a drainage pump, the wash water in the water storage section 24 passes through the drainage passage in the connection pipe 34 and is sucked into the pump 28 from the drainage suction port, and then from the drainage discharge port. It is discharged to the outside through the drainage hose 32. On the other hand, when the pump 28 functions as a cleaning pump, the cleaning water in the water reservoir 24 passes through the cleaning water channel in the connection pipe 34 and is sucked into the pump 28 from the cleaning inlet. Thereafter, the cleaning water is discharged from the cleaning discharge port to the water distribution pipes 31 a and 31 b and is injected into the cleaning tank 2 from the injection nozzles 20 and 22.

The blower 29 is disposed in the vicinity of the heater 25 in the lower part of the cleaning tank 2. The blower 29 includes a fan (not shown) and a fan motor 36 (shown only in FIG. 5) housed in the casing 35. The casing 35 is connected to the vicinity of the heater 25 in the cleaning tank 2 through a blower pipe 37.
A water supply port 38 is provided at the center of the rear portion of the bottom of the cleaning tank 2. The water supply port 38 includes a cylindrical portion 38a that protrudes from the bottom of the cleaning tank 2 and has an opening at the upper end, and a cover 38b that covers the upper portion of the cylindrical portion 38a. A water supply pipe 41 is connected to the lower part of the tubular portion 38a through a water supply valve 40. The water supply pipe 41 extends through the rear lower part of the cleaning machine main body 3 to the outside of the cleaning machine main body 3, and its end is connected to a water supply source such as water supply via a water supply hose (not shown). It has become.

In the present embodiment, a water supply apparatus is constituted by the water supply port 38, the water supply valve 40, the water supply pipe 41 and the like. The water supply unit, the pump 28, the pump motor 30, and the injection nozzle 22 constitute water guiding means. Further, the water supply device, the pump 28, the pump motor 30, and the injection nozzle 22 also function as cleaning means.
FIG. 5 shows the electrical configuration of the dishwasher 1 as a block diagram. In FIG. 5, the control circuit 42 is mainly composed of a microcomputer, and includes a RAM 42a as a volatile memory and a flash memory 42b as a rewritable nonvolatile memory as storage means. The flash memory 42b stores a control program executed by the microcomputer.

The control circuit 42 detects a switch input unit 43 that responds to the operation of various switches on the operation panel 6, a door opening detection sensor 44 that responds to the opening / closing operation of the lower door 4, and the temperature of the cleaning water in the cleaning tank 2. Output signals of the door opening detection sensor 45 and the water level sensor 46 for detecting the water level in the cleaning tank 2 are given.
The pump motor 30 is connected to the control circuit 42 via an inverter circuit 47. Further, a fan motor 36, a sheathed heater 25, a display circuit 49, a notification device 50, and a water supply valve 40 (corresponding to a water supply device) are connected to the control circuit 42 via a drive circuit 48.

  The water level sensor 46 is provided, for example, in a water tank (not shown) provided adjacent to the cleaning tank 2, and indirectly detects the water level in the cleaning tank 2 by detecting the water level in the water tank. Detect. Various display units provided on the operation panel 6 are connected to the display circuit 49. The notification device 50 notifies the end of the cleaning operation or the occurrence of an error by sounding a buzzer.

  Next, the operation of this embodiment will be described. Here, a standard cleaning operation course (hereinafter referred to as “standard course”) executed by the control circuit 42 will be described as an example. After the standard course is set with the course setting switch of the operation panel 6, when the start of the cleaning operation is instructed with the start switch, the control circuit 42 causes the steam process, the cleaning process, the rinsing process, the heating rinsing process, and the drying. The steps are executed in order. That is, the control circuit 42 functions as a steam generation unit and a cleaning unit.

In the steam process, the control circuit 42 performs the steam generation operation after performing the operation of opening the water supply valve 40 and supplying the cleaning tank 2 with water. The water level in the cleaning tank 2 in the steam process is referred to as “steam generation water level”. The steam generation water level is set to a low water level at which the heater 25 is not submerged. The steam process will be described later.
In the washing process and each rinsing process, the operation of supplying water into the washing tank 2 by opening the water supply valve 40, the washing operation or rinsing operation of operating the pump 28 and ejecting the water in the water storage section 24 from the injection nozzles 20 and 22. The operation of discharging the water in the water storage unit 24 by operating the pump 28 is sequentially executed. The water level in the washing step and each rinsing step is referred to as “washing water level”. The cleaning water level is a water level at which the heater 25 is completely submerged, and is set at a higher water level than the steam generation water level.

  In the steam process, the control circuit 42 opens the water supply valve 40 for a predetermined time (for example, 5 seconds). On the other hand, in the cleaning process and each rinsing process, the control circuit 42 opens the water supply valve 40 until it detects that the water level in the cleaning tank 2 has reached the “cleaning water level” based on the input signal from the water level sensor 46. It has become. When the steam generation operation in the steam process ends, the control circuit 42 proceeds to the cleaning process without executing the drain operation. Accordingly, in the water supply operation of the cleaning process, water corresponding to the difference between the “cleaning water level” (water level indicated by A in FIG. 6) and the “steam generation water level” (water level indicated by B in FIG. 6) is stored in the cleaning tank 2. It is only necessary to add the water, and the water stored in the cleaning tank 2 in the steam process can be used in the cleaning process.

Further, in the cleaning process and the heating rinsing process, the control circuit 42 generates heat intermittently in the sheathed heater 25 based on the input signal from the door opening detection sensor 45 so that the temperature of the cleaning water in the cleaning tank 2 becomes a predetermined temperature. Let In the drying process, hot air is circulated in the cleaning tank 2 by operating the blower 29 while intermittently generating heat in the sheathed heater 25.
Next, the steam process will be described with reference to FIG. FIG. 6 shows the operation timings of the water supply valve 40, the pump 28, and the heater 25 in the steam process and the cleaning process together with changes in the water level and the water temperature.

As shown in FIG. 6, in the steam process, first, the control circuit 42 opens the water supply valve 40 and executes the water supply operation. By this water supply operation, water is stored in the cleaning tank 2 up to the steam generation water level.
Subsequently, the control circuit 42 executes the steam generation operation by alternately operating the heater 25 and the pump 28 six times each. In this case, the energization time of the first and sixth heaters 25 is set to 12 seconds, and the energization time of the second to fifth heaters 25 is set to 7 seconds. On the other hand, the operation time of the pump 28 is set to 12 seconds each time. Specifically, the control circuit 42 rotates the pump motor 30 in one direction (forward rotation direction) at a low speed for 12 seconds so that the duty ratio of the operation time is, for example, 1 second ON / 2 seconds OFF.

  As a result, the pump 28 functions as a cleaning pump, and the water in the cleaning tank 2 is pumped up by the pump 28 and ejected into the cleaning tank 2 from the injection holes 20 b and 22 b of the injection nozzles 20 and 22. In this case, the rotational speed of the pump motor 30 is set lower than the rotational speed of the pump motor 30 during the cleaning step so that the momentum of the water ejected from the ejection hole 22b is weak and the ejection nozzle 22 rotates slowly. . Therefore, when the injection hole 22b is positioned in the vicinity of the upper portion of the protective cover 26, the water discharged from the injection hole 22b is dripped onto the heater 25 through the protective cover 26 without being scattered far away. At this time, since the upper surface 25a of the heater 25 is substantially horizontal, the water dripped onto the heater 25 is easily held on the heater 25. For this reason, more water can be brought into contact with the heater 25.

  FIG. 7 shows a change in the surface temperature of the heater 25 during the steam generation operation. As shown in FIG. 7, the surface temperature of the heater 25 rises to around 100 ° C. by the first energization. Therefore, when the pump 28 is operated next and water is dripped onto the heater 25, the water is instantly evaporated and floats in the cleaning tank 2. As a result, the dirt adhering to the tableware swells with water. Further, the surface temperature of the heater 25 drops to around 40 ° C. when water is dropped, but returns to around 100 ° C. when the power is turned on again. Therefore, the surface temperature of the heater 25 during the pump operation is about 100 ° C., and when water is dropped on the heater 25, steam is efficiently generated.

A part of the water dropped on the heater 25 is returned to the cleaning tank 2 without evaporating. Accordingly, the temperature of the water in the cleaning tank 2 rises with the progress of the steam process.
Thus, according to the present Example, the steam process was provided before the washing | cleaning process, and the dirt adhering to tableware was swollen. For this reason, the stain | pollution | contamination adhering to tableware with the water sprayed from the injection nozzles 20 and 22 at the washing | cleaning process can be washed out efficiently and reliably. In particular, in the present embodiment, the sheathed heater 25 functions as a heat source for steam generation in the steam process and a heat source for water heating in the cleaning process and the heating rinse process. For this reason, the number of parts can be reduced as compared with the case where both heat sources are composed of separate heaters.

  In the steam process, the heater 25 was energized intermittently. Since the surface temperature of the heater 25 is low at the start of the steam process, the first heater energization time is made longer than the second and subsequent heater energization times, and the surface temperature of the heater 25 becomes about 100 ° C. at the end of energization. I did it. Therefore, when water is brought into contact with the heater 25, steam can be instantaneously generated. For this reason, compared to the conventional configuration in which the heater is submerged when the water is heated to generate the steam, the heating time of the water necessary for generating the steam can be shortened and the heat energy can be reduced. it can.

  Even if the heater 25 is energized while water is in contact with the heater 25, the surface temperature of the heater 25 does not increase so much. In addition, the thermal energy of the heater 25 only contributes to heating the water returned to the cleaning tank 2 without contacting the heater 25 and evaporating. In contrast, in this embodiment, the heater 25 was stopped when water was brought into contact with the heater 25. Therefore, the heat energy of the heater 25 can be effectively used to evaporate water.

Furthermore, by energizing the heater 25 intermittently, the surface temperature of the heater 25 when the steam process is executed in a state where water is not stored in the cleaning tank 2 can be kept low. Specifically, FIG. 8 shows changes in the surface temperature of the heater 25 when the heater 25 is intermittently energized at the timing in the above-described steam process and continuously energized with no water stored in the cleaning tank 2. As shown in FIG.
As shown in FIGS. 8 and 9, the final surface temperature of the heater 25 when the heater 25 is energized intermittently with no water stored in the cleaning tank 2 is about 350 ° C., whereas The final surface temperature of the heater 25 when energized continuously is about 600 ° C.

  FIG. 10 shows a second embodiment of the present invention, and different points from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. The second embodiment is different from the first embodiment in the steam generation operation in the steam process. Specifically, as shown in FIG. 10, when the steam process is started, the control circuit 42 opens the water supply valve 40 for a predetermined time and supplies water into the cleaning tank 2. The steam generation water level of the present embodiment is set to a level slightly higher than the water level at which the heater 25 is submerged. Therefore, here, the control circuit 42 opens the water supply valve 40 for a time (for example, 8 seconds) longer than the open time (5 seconds) of the water supply valve 40 in the first embodiment.

  When the water supply operation is completed, subsequently, the control circuit 42 energizes the heater 25 continuously and executes the steam generation operation by intermittently operating the pump 28 four times. The operation time of each pump 28 is set to 12 seconds, for example, and the stop time of the pump 28 is set to 8 seconds, for example. Further, the pump motor 30 is continuously forward rotated at a low speed such that almost no water is jetted from the jet nozzles 20 and 22. That is, in this embodiment, the rotational speed of the pump motor 30 during the steam generation operation is set lower than in the first embodiment.

Therefore, when the pump 28 is operated, the water in the cleaning tank 2 is pumped up by the pump 28 but remains in the pump 28. As a result, the water level in the cleaning tank 2 is lowered and exposed to the heater 25 from the water. For this reason, when the surface temperature of the heater 25 rises and one operation of the pump motor is completed, the temperature becomes about 100 ° C.
When the operation time (12 seconds) of the pump motor 30 elapses, the pump motor 30 is stopped. Then, the water in the pump 28 flows backward and returns to the cleaning tank 2, and the water level in the cleaning tank 2 rises. As a result, the heater 25 is submerged and the heater 25 comes into contact with water. At this time, since the surface temperature of the heater 25 is about 100 ° C., the temperature of the water in contact with the heater 25 rapidly increases, and steam is generated. On the other hand, contact with water causes the surface temperature of the heater 25 to rapidly decrease.

After the rotation and stop of the pump motor 30 described above are repeated four times, the generation operation is finished, and the process proceeds to the next cleaning step.
As described above, in this embodiment, by controlling the driving of the pump motor 30 and moving the water level in the cleaning tank 2 up and down, the heater 25 and the water do not contact each other, and the contact state appears alternately. . Therefore, compared to the configuration in which the heater 25 is always submerged, the heat energy of the heater can be effectively used for generating steam.

FIG. 11 shows a third embodiment of the present invention, and the differences from the second embodiment will be described. In the third embodiment, the water level in the cleaning tank 2 is raised and lowered by changing the rotation speed of the pump motor, and the state where the heater and water do not contact each other and the state where they contact each other appear alternately. This is different from the second embodiment.
That is, the control circuit 42 performs the steam generation operation by continuously energizing the heater 25 and causing the pump motor 30 to rotate forward four times alternately at low speed and high speed. The low-speed rotation speed and the high-speed rotation speed are set so that almost no water is injected from the injection nozzles 20 and 22 when the pump motor 30 rotates at a low speed, and a little water is injected from the injection nozzle 22 when the pump motor 30 rotates at a high speed. Has been.

Therefore, in this embodiment, the water injected from the injection hole 22b of the injection nozzle 22 drops on the heater 25, so that the heater 25 and the water come into contact with each other.
In the third embodiment, the same operation and effect as in the first and second embodiments can be obtained.

  FIG. 12 shows a fourth embodiment of the present invention, and differences from the first embodiment will be described. In the fourth embodiment, a slope 61 (for guiding water flowing out from the water supply port 38 toward the protective cover 27 in a portion from the water supply port 38 to the protective cover 27 in the bottom portion in the cleaning tank 2. Equivalent to the guide route). Further, a rib 62 is provided on the lower surface of the protective cover 27 on the portion located above the heater 25. Furthermore, in this embodiment, a flow control valve is used as the water supply valve 40.

  And the control circuit 42 performs a steam process by controlling electricity supply of the water supply valve 40 and the heater 25 as follows. That is, when the steam process is started, the control circuit 42 energizes the heater 25. When the energization time of the heater 25 reaches a predetermined set time, specifically, when the heater surface temperature reaches about 100 ° C., the control circuit 42 opens the water supply valve 40 and starts the water supply operation. At this time, the control circuit 42 is configured to adjust the valve opening amount of the water supply valve 40 so that water flows out from the water supply port 38 little by little.

As a result, the water flowing out from the water supply port 38 reaches the protective cover 27 along the slope 61. Then, the water that has reached the top of the protective cover 27 passes through the hole 27 a of the cover 27 and then drops along the rib 62 onto the upper surface of the heater 25. The water dripped onto the upper surface of the heater 25 instantly evaporates and floats in the cleaning tank 2.
During the steam process, the water supply operation for causing the water to flow out from the water supply port 38 little by little is continued. At the end of the steam process, the water level in the cleaning tank is a level at which the heater is not submerged, and the control circuit 42 that has shifted to the cleaning process performs a normal water supply operation until the water level in the cleaning tank 2 reaches the cleaning water level. Then, the water in the washing tank 2 is added.

  According to this embodiment, since the means (slope 61, rib 62) for guiding the water flowing out from the water supply port 38 to the heater 25 is provided in the cleaning tank 2, the heater can be operated without operating the pump 28. 25 and water can be contacted efficiently.

The present invention is not limited to the above-described embodiments, and for example, the following modifications are possible.
You may provide the water level sensor which detects a steam production | generation water level. In the steam process, the control circuit may be configured to open the water supply valve until the water level in the cleaning tank 2 reaches the steam generation water level based on the output signal of the water level sensor.
You may make it improve the holding | maintenance power of the water which contacted the sheathed heater by providing a fine unevenness | corrugation at least in the upper surface among the surfaces of a sheathed heater, or making it hydrophilic using sodium silicate. With such a configuration, the amount of water in contact with the sheathed heater can be increased, and consequently the amount of steam generated can be increased.

The heating element is not limited to a sheathed heater, but may be any heater having an insulating property.
A heater for generating steam and a heater for heating cleaning water in the cleaning process and the heating rinse process may be provided separately. In this case, the heater for generating steam may be disposed at a site that is different from the bottom in the cleaning tank and that receives water sprayed from the spray nozzle.
In the second embodiment, when the pump motor is stopped to raise the water level in the cleaning tank and the heater and water are brought into contact with each other, the energization of the heater may be stopped.

  The control circuit 42 may be configured to determine whether water is being supplied into the cleaning tank based on the detection result of the water temperature sensor 45. And when it is judged that the water is not supplied into the cleaning tank, the steam process may not be executed. According to such a configuration, the temperature of the heater 25 can be prevented from rising excessively, and safety is improved. In this case, the water temperature sensor 45 and the control circuit 42 function as water supply detection means.

  The control circuit 42 may be configured to operate the blower by driving the fan motor during the steam generation operation. With such a configuration, the generated steam can be dispersed throughout the cleaning tank 2.

The external appearance perspective view which shows the 1st Example of this invention and shows the whole structure of a dishwasher External perspective view of dishwasher with door open Vertical side view of a dishwasher Diagram for explaining the shape of a sheathed heater Block diagram showing electrical configuration The figure which shows the operation timing of a water supply valve, a drainage pump, a circulation pump, and a heater in a steam process and a washing process with change of a water level and water temperature Diagram showing heater temperature during steam process The figure which shows the heater temperature at the time of idling when the heater is intermittently energized The figure which shows the heater temperature at the time of idling when the heater is energized continuously FIG. 5 equivalent view showing a second embodiment of the present invention FIG. 5 equivalent view showing a third embodiment of the present invention. The longitudinal cross-sectional view which shows the 4th Example of this invention and shows roughly the structure from a water supply opening to a sheathed heater

Explanation of symbols

In the drawings, 1 is a dishwasher, 2 is a washing tub, 22 is an injection nozzle (water induction means), 25 is a sheathed heater (heat source), 28 is a pump (pump means, water induction means), 29 is a blower, 30 is Pump motor (pump means, water guiding means), 36 is a fan motor, 38 is a water supply port, 40 is a water supply valve (water supply device), 42 is a control circuit (steam generating means, washing means), 62 is a slope (guidance path) Indicates.

Claims (13)

A washing tank for storing tableware;
A heat source disposed in the cleaning tank;
A water guiding means having a water supply device for supplying water into the cleaning tank, and for inducing and contacting water supplied into the cleaning tank by the water supply device to the heat source;
A dishwasher comprising steam generating means for generating steam by controlling the heat source and the water guiding means.   2. The dishwashing apparatus according to claim 1, wherein the steam generating means is configured to drive the water guiding means to induce water after energizing the heat source to increase the surface temperature of the heat source. Machine. A cleaning unit comprising: a water supply device; a pump unit that pumps up water stored and stored in the cleaning tank by the water supply device; and a spray nozzle that blows water pumped up by the pump unit onto the tableware,
The water guiding means is composed of the pump means and the injection nozzle,
2. The dishwasher according to claim 1, wherein the steam generating means is configured to control the pump means so that water sprayed from the spray nozzle contacts a heat source. The heat source is located at the bottom of the washing tank,
When the cleaning means drives the pump means to spray the water sprayed from the spray nozzle onto the tableware, the cleaning means supplies water to the water supply device until the water level in the cleaning tank is located above the heat source and energizes the heat source. The dish washer according to claim 3, wherein the dish washer is configured to heat water in the washing tank.   2. The dishwasher according to claim 1, wherein the steam generating means is configured to energize the heat source intermittently.   6. The dishwasher according to claim 5, wherein the first energization time of the heat source is set longer than other energization times.   The dish washer according to claim 5 or 6, wherein the steam generating means is configured to guide water to the water guiding means when energization of the heat source is stopped. A heat source is disposed at the bottom of the cleaning tank, and includes a water supply device, pump means for pumping up water stored in the cleaning tank by the water supply device, and water pumped up by the pump means to the tableware. A cleaning means having a spray nozzle for spraying,
The steam generating means supplies water to the water supply device until the water level in the cleaning tank is located above the heat source, and then controls the pump means to position the water level in the cleaning tank below the heat source. The first operation to be performed and the second operation to position the water level in the cleaning tank above the heat source are alternately repeated, and the heat source is energized during the first operation. The dishwasher according to claim 1, wherein A cleaning unit comprising: a water supply device; a pump unit that pumps up water stored and stored in the cleaning tank by the water supply device; and a spray nozzle that blows water pumped up by the pump unit onto the tableware,
The water level supplied into the washing tank by the water supply device during the steam generation operation by the steam generation means is higher than the water level supplied into the washing tank by the water supply device during the dish washing operation by the cleaning means. Set low,
The cleaning means is configured to drive the water supply device to add water to the cleaning tank after the steam generating means performs an operation of generating steam. Dishwasher. Provided with a water supply port that is provided in the cleaning tank and allows water from the water supply device to flow into the cleaning tank,
2. The dishwasher according to claim 1, wherein the water guiding means includes a guiding path for guiding water flowing out from the water supply port to a heat source. Equipped with a blower to circulate the air in the washing tank,
2. The dishwasher according to claim 1, wherein the steam generating means is configured to drive the blower when the heat source and the water guiding means are controlled to generate steam.   2. The dishwasher according to claim 1, wherein the heat source comprises a sheathed heater having a water droplet holding function. Provided with water supply detection means for detecting that water has been supplied into the washing tank,
2. The dishwasher according to claim 1, wherein the steam generating means energizes the heat source when it is detected by the water supply detecting means that water has been supplied into the washing tank.

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