JP2010051339A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the operation of an ultrasonic transducer by eliminating deposition of evaporation residue on the ultrasonic transducer. <P>SOLUTION: A dishwasher includes an atomizing device 39 atomizing liquid for atomization stored in a storage section 35, and control means 31 controlling the atomizing device, wherein the atomizing device 39 has an ultrasonic transducer 32 for atomization disposed in the storage section to come into direct contact with wash water, and the control means 31 is configured to operate the ultrasonic transducer 32 for the atomization for a predetermined time after a rinsing step and remove droplet attached to its surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dishwasher for cleaning dishes and the like.

  Conventionally, as shown in FIG. 5, this type of dishwasher swells the dirt by spraying the detergent solution sprayed in advance to remove the dirt adhering to the dish etc., and then spraying water. A cleaning method using mechanical force and chemical force by a detergent has been proposed (for example, see Patent Document 1).

  Hereinafter, the configuration will be described. The main body 51 of the dishwasher houses a tableware basket 52 for storing tableware in a washing tank 53, and an opening 54 of the washing tank 53 is provided with a door 55 for opening and closing the opening 54. Reference numeral 56 denotes a nozzle that jets the cleaning water stored in the cleaning tank 53 toward the tableware, and 57 is an atomizer that atomizes the cleaning water stored in the cleaning tank 53. When the atomizing device 57 is installed on the bottom surface of the cleaning tank 53 so that the ultrasonic vibrator 58 is in direct contact with the cleaning water, scale or foreign matter is deposited on the surface of the ultrasonic vibrator 58 or an external impact is applied. Therefore, the ultrasonic vibrator 58 is covered with a protective container 59 and the cleaning water is atomized through the protective liquid 60.

  About the dishwasher comprised as mentioned above, the operation | movement is demonstrated below. First, dirty dishes are set in the tableware basket 52, and the operation is started. When the operation is started, first, the atomizing device 57 atomizes the washing water in which the special detergent stored in the washing tank 53 is dissolved, and sprays the washing water 53 to swell dirt adhering to tableware and the like. Let Next, a main washing step of washing the dishes with the washing liquid ejected from the nozzle 56 is performed. And in order to wash away the stain | pollution | contamination adhering to tableware etc. from tableware, the rinse process which replaces the wash water in the washing tank 53 several times is performed. And the washing | cleaning of tableware is complete | finished by performing the warm water rinse process which heated the replaced wash water to about 70 degreeC. Finally, a drying process for drying water droplets adhering to the tableware is performed and the operation is terminated.

In the dishwasher as described above, the ultrasonic vibrator 58 is covered with the protective container 59 in order to prevent the washing water soiled by washing the dishes from touching the surface of the ultrasonic vibrator. The cleaning water is atomized through the protective liquid 60, but the heat of the ultrasonic vibrator 58 generated during the atomizing operation is transmitted to the cleaning water through the protective liquid 60 and the protective container 59, so that the heat escapes. For this reason, the cooling performance of the ultrasonic vibrator 58 during operation is poor, the long-time operation or high output cannot be sufficiently performed, and the problem of low atomization ability is solved, and the complicated configuration is simplified. For this purpose, a configuration in which the ultrasonic transducer 58 is provided so as to come into contact with the atomizing liquid has been considered (for example, see Patent Document 2).
JP 2005-287993 A JP 2008-036394 A

  However, in the above-described conventional configuration, in order to prevent foreign matter from accumulating on the surface of the ultrasonic vibrator because it is in direct contact with the dirty cleaning water, the ultrasonic vibrator is arranged so that the vibration surface is substantially vertical. Even if foreign matter adheres to the surface of the ultrasonic vibrator in the cleaning process, the foreign matter can be washed away in the rinsing process after cleaning.

However, water droplets may remain after foreign matters such as dirt adhering to the surface of the ultrasonic vibrator are washed away in the rinsing process. Although these water droplets can be evaporated by warm air in the drying step following the rinsing step, if the water droplets adhering to the surface of the ultrasonic vibrator evaporate, evaporation residues such as scale remain, and in the drying step A new problem has arisen that it is difficult to remove once it is fixed and deposited by heating.

  The present invention solves the above-described conventional problems, and an object thereof is to stabilize the operation of the ultrasonic transducer by eliminating the accumulation of evaporation residue on the ultrasonic transducer in the drying process.

  In order to solve the conventional problem, the dishwasher of the present invention includes an atomizing device that atomizes the atomizing liquid stored in the storage unit, and a control unit that controls the atomizing device, and the fog The atomizing device has an atomizing ultrasonic transducer disposed so as to be in direct contact with the cleaning water in the reservoir, and the control means operates the atomizing ultrasonic transducer for a predetermined time after the rinsing process. In this way, water droplets attached to the surface are removed.

  As a result, even when water droplets adhere to the surface of the atomizing ultrasonic vibrator in the rinsing process, they are removed after the rinsing process, so that the evaporation ultrasonic scale is evaporated as a residue after evaporation in the drying process. It can be prevented from being fixed and deposited by heating in the drying process.

  The dishwasher of the present invention can prevent scales and the like from remaining as evaporation residues on the surface of the atomizing ultrasonic vibrator, and can stabilize the operation of the atomizing ultrasonic vibrator.

  The first invention is a cleaning tank for storing objects to be cleaned such as tableware, a cleaning pump for pressurizing cleaning water, a cleaning nozzle for jetting cleaning water pressurized by the cleaning pump, and a liquid to be atomized. A storage unit for storing, an atomization device for atomizing the atomizing liquid stored in the storage unit, and a control means for controlling the atomization device, wherein the atomization device is configured to wash water in the storage unit. The atomizing ultrasonic transducer is arranged so as to be in direct contact with the control device, and the control means operates the atomizing ultrasonic transducer for a predetermined time after the rinsing process to remove water droplets adhering to the surface. As a result, even if water droplets adhere to the surface of the ultrasonic transducer for atomization in the rinsing process, they are removed after the rinsing process, so that they evaporate in the drying process, and scales etc. are used as an evaporation residue. It does not remain on the surface of the ultrasonic vibrator, It is possible to prevent the deposition of fixed evaporation residue by heat.

  According to a second aspect of the present invention, in the atomization device according to the first aspect, the vibration surface of the atomizing ultrasonic vibrator is installed in a substantially vertical direction, and the ultrasonic vibration energy generated from the atomizing ultrasonic vibrator is provided. Is reflected by the reflection part configured in the water of the atomizing liquid, and the liquid level of the atomizing liquid is raised and atomized, so that the atomizing ability is improved by increasing the output of the ultrasonic vibrator. In addition, even when foreign matter adheres to the surface of the ultrasonic transducer in the cleaning process, the foreign matter can be washed away in the rinsing process after cleaning.

  According to a third aspect of the present invention, in the atomization device according to the first aspect of the present invention, the vibration surface of the atomizing ultrasonic vibrator is inclined at a predetermined angle with respect to the horizontal direction, and the atomizing ultrasonic vibration is provided. By atomizing the liquid level of the atomizing liquid with ultrasonic vibration energy generated from the child, it can be directly atomized with the vibration energy of the ultrasonic vibrator, improving atomization efficiency. can do.

According to a fourth aspect of the present invention, in the atomization device according to any one of the first to third aspects, a holding unit that holds a peripheral edge of the atomizing ultrasonic transducer is provided, and the atomizing ultrasonic transducer is By providing a water-drawing part on the lower side and guiding the water droplets that remain below the atomizing ultrasonic transducer to the storage unit side, the water droplets remaining on the surface of the ultrasonic transducer are guided to the storage unit side to ensure Can be removed.

  According to a fifth aspect of the present invention, in the atomization apparatus according to the fourth aspect of the present invention, a concave portion that is depressed downward is formed in a lower portion of the holding portion that holds the periphery of the ultrasonic transducer for atomization, and a water draw portion is provided in the concave portion. Thus, water droplets can be collected at the lower part of the holding part and reliably guided to the storage part side.

  According to a sixth aspect of the present invention, in the atomization apparatus according to any one of the first to fifth aspects, the surface of the ultrasonic transducer is rinsed in the rinsing step by performing a smoothing process on the vibration surface of the ultrasonic transducer for atomization. As a result, it is possible to reduce adhesion of water droplets to the water droplets and to reliably remove water droplets by vibration of the atomizing ultrasonic vibrator after the rinsing process.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of the dishwasher / dryer according to Embodiment 1 of the present invention, FIG. 2 is a detailed cross-sectional view of the atomizing device of the dishwasher / dryer, and FIG. As shown in FIGS. 1 to 3, the main body 21 of the dishwasher is configured such that a washing tub 23 having an opening 22 in the front can be opened and closed by a pair of upper and lower doors 24. A cleaning nozzle 27 having an injection port 26 for injecting cleaning water pressurized by a cleaning pump 25 is provided below the cleaning tank 23.

  Above the cleaning nozzle 27, a tableware basket 28 for storing tableware to be cleaned is provided. Below the cleaning tank 23, a heater 29 for heating the cleaning water is disposed. A guide 30a is disposed on the side wall of the tableware basket 28, and a guide rail 30b is disposed on the inner side wall of the main body 21, and the tableware basket 28 is supported so that it can be pulled out substantially horizontally with respect to the washing tub 23. Has been.

  A control means 31 is provided below the cleaning tank 23 and controls the atomizing ultrasonic transducer 32, the cleaning pump 25, the heater 29, and the like. Below the cleaning tank 23, an electrode-type water level sensor 38 is provided as a water level detection means for detecting the level of the atomizing liquid (wash water). The atomizing ultrasonic transducer 32 is fixed to the side wall surface of the cleaning tank 23 via a holding portion 33 formed of a packing or the like so that the vibration surface 32a is in a substantially vertical direction, and is pressed and water-sealed. It is said.

  The atomizing ultrasonic transducer 32 is formed of a metal plate such as stainless steel having a thickness of about 0.3 to 1.5 mm, preferably about 0.8 mm, and the vibration surface 32a is formed of titanium oxide or a composite thereof. The protective layer is protected by a protective layer, and the protective layer has a thickness of about 0.5 to 500 μm and preferably about 5 μm. By providing the protective layer of the oxide film on the vibration surface 32a, the vibration surface 32a can be prevented from being corroded and the vibration surface 32a can be processed into a smooth and smooth surface.

  The atomizing ultrasonic transducer 32 is formed in a substantially disc shape, and its peripheral portion is held by the holding portion 33 and attached to the side wall surface of the cleaning tank 23. A lower portion of the holding portion 33 is formed with an arc-shaped concave portion 33a that is recessed downward, and a rib-like water-drawing portion 35a is provided in the concave portion 33a that is located at the lower portion (lower side) of the atomizing ultrasonic transducer 32. The water droplets staying in the recess 33a are guided to the storage portion 35 side through the water drawing portion 35a.

The ultrasonic vibration energy emitted from the atomizing ultrasonic transducer 32 is reflected toward the liquid surface at a position facing the atomizing ultrasonic transducer 32 provided so that the vibration surface 32a is substantially vertical. A stainless steel reflecting plate 34 (reflecting portion) is provided in the storage portion 35. The reflecting plate 34 is provided with a substantially concave shape portion 41 that is recessed into a spherical shape (SR = 90) so as to converge the ultrasonic vibration energy, so that the reflected ultrasonic vibration energy is converged near the liquid surface. And is immersed in a liquid (detergent solution) stored in the storage unit 35.

  A liquid (detergent liquid) to be atomized is stored in the storage unit 35. The upper part of the storage part 35 is covered with a detergent container cover 36. The reservoir 35 is provided with a detergent inlet 40 at the lower part of the front side wall surface of the cleaning tank 23. The reservoir 35 is formed as a tank independent of the cleaning tank 23, and the cleaning water communicates with the cleaning tank 23 through a notch 37 formed by the cleaning tank 23 and the detergent container cover 36. The atomized high-concentration detergent is scattered from the opening (not shown) of the detergent container cover 36 into the cleaning tank 23.

  The detergent case cover 36 is provided with a stainless steel shielding plate 42 that shields the water column generated by the liquid surface rising by the vibration energy of the atomizing ultrasonic vibrator 32, and the water that hits the shielding plate 42. Is returned to the storage unit 35. The reflecting plate 34 and the shielding plate 42 are integrally formed of a thin plate made of stainless steel, and are fixed to the detergent container cover 36 and the storage portion 35, and the ultrasonic waves generated from the atomizing ultrasonic transducer 32. The water column W generated on the liquid surface with energy at a predetermined reflection angle collides with the shielding plate 42 so that stable atomization performance can be exhibited. The generated mist of detergent liquid scatters into the cleaning tank 23 from openings provided on both sides of the shielding plate 42.

  In the above configuration, the atomizing ultrasonic transducer 32 is in direct contact with the dirty cleaning water, but the vibration surface 32a of the atomizing ultrasonic transducer 32 is provided in a substantially vertical direction with respect to the cleaning tank 23. Solid matter such as food does not accumulate on the vibration surface 32 a of the atomizing ultrasonic transducer 32. Further, even when water with very high hardness such as well water is used, since the water droplets hardly remain on the surface of the atomizing ultrasonic transducer 32, the inorganic component is precipitated and the ultrasonic transducer for atomization is used. Therefore, the atomization can be performed stably over a long period of time.

  Next, the operation of the dishwasher of the present invention will be described. First, a predetermined amount of detergent (preferably dedicated detergent) is put into the storage unit 35 from the detergent charging port 40. Next, a predetermined amount of cleaning water is supplied to the cleaning tank 23 from a water supply valve (not shown). Wash water is supplied by controlling the water supply valve by the control means 31. Moreover, the cleaning water supplied into the cleaning tank 23 enters the storage unit 35 from the notch 37, and a part of the detergent starts to dissolve in the cleaning water. At this time, when the atomizing ultrasonic vibrator 32 is vibrated, the vibration propagates through the liquid in the reservoir 35 and is reflected by the reflecting plate 34 and propagates toward the cleaning water surface. And the water column W generate | occur | produces on the water surface and atomization of a detergent liquid is performed.

  The high-concentration detergent liquid is generated by dissolving the detergent liquid and suppressing the diffusion of the high-concentration detergent liquid into the cleaning water in the cleaning tank 23. First, regarding the concentration, for example, when the water storage volume of the storage unit 35 is set to 1/50 of the amount of water supplied to the entire washing tank 23 and a predetermined amount of detergent is added, theoretically, the concentration is about 50 times. The detergent liquid can be produced. However, since it is connected to the inside of the cleaning tank 23 by the notch portion 37, the concentration of the detergent solution is slightly reduced by the diffusion of the detergent solution. Therefore, in order to suppress the decrease in the concentration, the high concentration detergent solution hitting the shielding plate 42 is transmitted along the inner wall of the detergent container cover 36 so that the water column W made of the high concentration detergent solution does not flow directly into the cleaning tank 23. Then, it is collected in the storage unit 35.

  With this configuration, a flow of high-concentration detergent liquid water is generated in the reservoir 35, preventing a decrease in the detergent liquid concentration and speeding up the dissolution of the detergent. Further, when the heater 29 is energized simultaneously with the atomization operation, the washing water is also heated, so that the dissolution of the detergent is promoted and the detergent liquid concentration is further increased. As described above, the concentration of the high-concentration detergent liquid is such that the concentration of the detergent liquid increases as the detergent liquid scatters. For this reason, firstly, the detergent solution with a low concentration is attached to the contamination so that the detergent solution becomes familiar with the stain, and then the detergent solution with a high concentration is attached to the contamination. It increases the permeability of surfactants to contamination and improves cleaning performance.

  Although the high-concentration detergent liquid flows out into the cleaning tank 23 from the notch 37, the opening area of the notch 37 is minimized, so that the decrease in the detergent solution concentration is minimized. Further, when the vibration surface 32a of the atomizing ultrasonic transducer 32 is not immersed in the cleaning water, the atomization stops and the high-concentration detergent liquid is not scattered, so the atomizing ultrasonic transducer 32 is driven. When the water level is detected, the water level detection sensor 38 detects the water level so that the atomizing ultrasonic transducer 32 is immersed in the cleaning water, and the vibration surface 32a of the atomizing ultrasonic transducer 32 is immersed in the cleaning water. Control is performed so that the operation of the atomizing device 39 is stopped before it disappears. The mist generation efficiency can be improved by optimizing the reflecting surface 34 from the vibration surface 32a in water, the distance from the reflecting plate 34 to the water surface, the inclination angle of the water column W, and the like.

  Further, since the high-concentration detergent liquid atomized by the atomizing ultrasonic vibrator 32 has a fine particle size of about 3 microns, it does not convection to the upper part of the cleaning tank 23 as it is and drifts in the vicinity of the liquid surface. Only. However, in the configuration of the present embodiment, since the heater 29 is energized simultaneously with the atomization operation, the cleaning water is heated, and air convection is generated by the heat accompanying the temperature rise. Then, due to the convection effect of the air, the atomized high-concentration detergent liquid fills the entire cleaning tank 23 and adheres uniformly to the surface of the tableware. Further, the chemical effect is further increased by increasing the temperature of the atomized high-concentration detergent solution, so that the cleaning effect is dramatically improved.

  In this way, the detergent solution of high concentration adhering to the contamination of the tableware in the pretreatment process penetrates and swells, and is allowed to stand for a certain period of time so that the effect of the detergent can be obtained more.

  Next, a main washing process is performed in which the washing pump 25 is driven to inject washing water from the washing nozzle 27 onto the dishes. In the main washing process, in addition to the amount sprayed on the tableware and the like in the pretreatment process, the detergent liquid remaining in the storage unit 35 is also washed away by the washing water sprayed from the washing nozzle 27 and diffused into the washing tank 23. Therefore, wash with normal detergent concentration.

  And after performing the rinse process of several times by replacing the wash water of the washing tank 23, the heating rinse process is performed with the high temperature wash water heated at the end, and a washing process is complete | finished. In this rinsing step, foreign matters such as dirt adhering to the surface of the atomizing ultrasonic transducer 32 in the main washing step are washed away.

  Subsequent to the main washing step, a drying step of drying the washed tableware is performed. In this drying process, heated hot air is blown into the washing tub 23 to evaporate water droplets attached to the surface of the tableware. At this time, if water droplets adhere to the surface of the atomizing ultrasonic transducer 32, the water droplets are evaporated by the warm air, and evaporation residues such as scale remain on the surface of the atomizing ultrasonic transducer 32, In order to fix and deposit by heating in the drying step, the atomizing ultrasonic vibrator 32 is operated for a predetermined time, for example, several seconds after the rinsing step, and water droplets adhering to the surface are removed by vibration.

  What is important is the timing at which the water droplets are removed by the vibration of the atomizing ultrasonic transducer 32, one being performed after the rinsing process in which the water droplets do not reattach, and the other is This is done before the water droplets attached by heating in the drying process evaporate.

  As described above, in this embodiment, even when water droplets adhere to the surface of the ultrasonic vibrator in the rinsing process, they are removed before the evaporation after the rinsing process. It does not remain on the surface of the ultrasonic vibrator as an object, and it is possible to prevent the evaporation residue from being fixed and deposited by heating in the drying process.

In addition, the vibration surface of the atomizing ultrasonic transducer is installed in a substantially vertical direction, and is reflected by the reflecting portion configured in the water of the atomizing liquid to raise the liquid surface of the atomizing liquid and atomize it. By doing so, the atomization ability can be improved by increasing the output of the ultrasonic transducer. Even when foreign matter adheres to the surface of the ultrasonic vibrator in the cleaning step, the foreign matter can be washed away in the rinsing step after cleaning, and water droplets attached in the rinsing step can be made difficult to remain on the surface.

  In addition, a holding portion 33 that holds the periphery of the atomizing ultrasonic transducer 32 is provided, and a water-drawing portion 35 a is provided on the lower side of the atomizing ultrasonic transducer 33, so that the atomizing ultrasonic transducer 32 is provided. Since the water droplets staying in the lower part of the water droplet are guided to the storage unit 35 side, the water droplets falling from the surface of the atomizing ultrasonic transducer 32 can be guided to the storage unit 35 side without staying in the lower part.

  In addition, by performing smooth smoothing on the vibration surface 32a, water droplets attached in the rinsing process are less likely to remain on the surface, and water droplets are removed more effectively by vibration of the atomizing ultrasonic vibrator 32. be able to.

(Embodiment 2)
FIG. 4 is a cross-sectional view of the atomizing device of the dishwasher according to Embodiment 2 of the present invention. The feature of this embodiment is that the vibration surface of the atomizing ultrasonic transducer of the atomizing device is installed at a predetermined angle with respect to the horizontal direction. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals, and the detailed description thereof is the same as that of the first embodiment.

  The liquid level of the atomizing liquid is directly raised by the ultrasonic vibration energy generated from the atomizing ultrasonic vibrator 32, and the periphery of the atomizing ultrasonic vibrator 32 is It is held by the holding part 33 and is sealed to the bottom of the storage part 35 in a watertight manner. The inclination angle of the atomizing ultrasonic transducer 32 is 10 to 20 degrees, preferably 15 degrees with respect to the horizontal plane.

  The atomizing ultrasonic transducer 32 having the periphery held by the holding unit 33 is sandwiched between the fixing tool 43 and the cleaning tank 23, and the upper surface side of the atomizing ultrasonic transducer 32 is washed with the holding unit 33. A small amount of rinsing water remains in the enclosed portion B after the rinsing process, and the atomizing ultrasonic vibrator 32 is operated for a predetermined time after the rinsing process, and is atomized. The rinsing water remaining in the enclosed portion B on the upper surface side of the ultrasonic transducer 32 is removed.

  Therefore, the rinsing water remaining on the atomizing ultrasonic transducer 32 does not evaporate in the drying process, and scales do not remain on the surface of the ultrasonic transducer as evaporation residues. It is possible to prevent the evaporation residue from being fixed and deposited by heating. When removing the rinse water, it is possible to remove the rinse water more reliably by repeating a short vibration several times.

  As described above, the dishwasher according to the present invention can prevent scales and the like from remaining as evaporation residues on the surface of the ultrasonic vibrator, and can stabilize the operation of the ultrasonic vibrator. It is useful as a dishwasher or the like that can obtain high cleaning performance.

Sectional drawing of the dishwasher of Embodiment 1 of this invention Cross section of the main part of the atomizer of the dishwasher A view of the dishwasher atomizer Sectional drawing of the principal part of the atomization apparatus of the dishwasher of Embodiment 2 of this invention Cross-sectional view of a conventional dishwasher

Explanation of symbols

DESCRIPTION OF SYMBOLS 23 Cleaning tank 25 Cleaning pump 27 Cleaning nozzle 31 Control means 32 Atomizing ultrasonic transducer 33 Holding part 34 Reflecting part 35 Storage part 35a Water-drawing part 39 Atomizing apparatus

Claims (6)

A cleaning tank for storing objects to be cleaned such as tableware, a cleaning pump for pressurizing cleaning water, a cleaning nozzle for injecting cleaning water pressurized by the cleaning pump, and a reservoir for storing liquid to be atomized, An atomizing device for atomizing the atomizing liquid stored in the storage unit; and a control means for controlling the atomizing device, wherein the atomizing device is arranged so as to be in direct contact with cleaning water in the storage unit. A dishwasher having an atomizing ultrasonic vibrator provided, wherein the control means operates the atomizing ultrasonic vibrator for a predetermined time after the rinsing step to remove water droplets adhering to the surface. . The atomizing device has the vibration surface of the atomizing ultrasonic vibrator installed in a substantially vertical direction, and the ultrasonic vibration energy generated from the atomizing ultrasonic vibrator is configured in the water of the atomizing liquid. The dishwasher according to claim 1, wherein the liquid level of the atomizing liquid is raised by being reflected by the reflecting portion so as to be atomized. The atomizing device is installed by inclining the vibration surface of the atomizing ultrasonic transducer at a predetermined angle with respect to the horizontal direction, and atomizing by the ultrasonic vibration energy generated from the atomizing ultrasonic transducer. The dishwasher according to claim 1, wherein the liquid level of the liquid for use is raised and atomized. The atomizing device is provided with a holding unit that holds a peripheral edge of the atomizing ultrasonic transducer, a water draw unit on a lower side of the atomizing ultrasonic transducer, and a lower portion of the atomizing ultrasonic transducer. The dishwasher of any one of Claims 1-3 which was made to guide the water droplet which stays to the storage part side. 5. The dishwasher according to claim 4, wherein the atomizing device forms a concave portion that is depressed downward in a lower portion of a holding portion that holds a periphery of the ultrasonic transducer for atomization, and a water draw portion is provided in the concave portion. The atomizer is a dishwasher according to any one of claims 1 to 5, wherein the vibration surface of the atomizing ultrasonic vibrator is smoothed.