JP5125693B2 - Tableware dryer - Google Patents

Description

  The present invention relates to a tableware dryer for drying tableware and the like.

  Conventionally, this type of domestic tableware dryer and dishwasher dries the tableware with warm air. That is, by introducing the outside air into the drying cabinet by a blower fan, heating the air introduced by the heater, applying the dry warm air to the tableware to evaporate the water adhering to the tableware and discharging it outside the drying cabinet Dry the dishes.

  Moisture and water droplets are not uniformly attached to the tableware, and when the moss is set face down on the tableware basket, it accumulates in a concave part facing upward (for example, a thread bottom) or the tableware is placed on the tableware basket When set to, there are large water droplets near the point of contact between the tableware and the tableware basket. On the other hand, since the dishes are set against a tableware basket, they exist as a very thin water film in a plane portion close to the vertical. Therefore, in the case of drying using warm air, the thin water film-like portion dries quickly, but the water accumulated on the yarn bottom and large water drops take time to dry, and the drying time becomes longer to remove all water drops. Tend to.

  If the drying time is prolonged due to the uneven distribution of moisture, it is inconvenient for the user, and the energy used is large and uneconomical. In addition, since the temperature of the portion where the moisture dries quickly in the tableware or the cabinet continues to rise, deformation or deterioration due to heat may occur in the case of a resin that is sensitive to heat. Further, in the portion where the large water droplet remains, the non-volatile impurities and inorganic components contained in the water droplet remain as water spots, and the finished appearance after the tableware is dried is impaired.

  In order to solve the above problems, it is necessary to remove the large water droplets and make the amount of the remaining water adhered uniformly. As a general example, it is conceivable to remove the water droplets with air. (For example, refer to Patent Document 1). By spraying high-speed air jets on the tableware, large drops of water and water collected in the depressions are removed. The removal effect is small. In addition, when the dishes are closely overlapped with each other or when the dishes are behind other dishes, the effect of removing water drops is small.

  The above problem can be solved to some extent by increasing the flow velocity and flow rate of the air jet, but on the other hand, the risk of tableware falling by the air jet increases. These problems are unavoidable for home appliances where the user is unsure how to store the dishes.

  One of the other techniques for removing the large water droplets is to make the large water droplets on the solid surface finer and scatter by a device that focuses the ultrasonic waves radiated into the air (see, for example, Patent Document 2). Unlike the above-described air jet that moves a mass of air, this method does not generate an air current, and therefore there is no problem of tableware falling. In addition, when the dishes overlap each other, a high water droplet removal effect can be expected as described later.

An outline of the above apparatus will be described with reference to FIGS. A horn 102 is attached to the ultrasonic transducer 101 to increase the amplitude, and then a rectangular radiating plate 104 is attached to the rod 103 and extended perpendicularly to the rod 103. As shown by the broken line in FIG. When bending and vibrating in the long side direction, ultrasonic waves are efficiently emitted from the radiation plate 104 into the air. Since the radiation plate 104 vibrates in a mode with different phases in a striped manner in the long side direction, vibrations having opposite phases, that is, vibrations shifted by ½ wavelength are radiated from adjacent striped portions. By providing the ultrasonic focusing means 105 having a step corresponding to ½ wavelength at a position away from both surfaces or one surface of the radiation plate, the reflected ultrasonic waves are aligned in the same phase. By providing the surface of the ultrasonic focusing means 105 with respect to the radiation plate 104 in a substantially parabolic shape, the ultrasonic wave can be focused linearly or in a point shape on the focal position of the parabolic surface.

  When the ultrasonic wave propagating in the air is focused in this way, the sound pressure at the focal position increases, and when the sound pressure at the focal position exceeds approximately 3 to 5 kPa, water and water droplets can be made fine and blown away. This is because the water near the water surface is subjected to stress that causes the water surface to wave by ultrasonic waves called capillary waves. When the stress exceeds the surface tension of water, the water is refined so that the water on the water surface is torn off from the water surface.

  When several ml of water is accumulated in a dimple such as the bottom of a tableware, the water gradually becomes finer from the water surface and acts as if it evaporates rapidly. When the distance between the dishes is short, the ultrasonic waves that have entered the gaps between the dishes have the property of repeatedly reflecting and entering the back. Therefore, when a plurality of dishes are arranged substantially vertically at a predetermined pitch, it can be expected that if the ultrasonic wave is focused on the upper end of the gap, the ultrasonic wave will naturally enter the gap and drop water drops.

  When water drops are removed by airborne ultrasonic waves with a large number of dishes arranged in a closed drying cabinet, some of the water droplets that have been made fine and scattered fall to the bottom of the drying cabinet due to gravity, but another part Will adhere to relatively dry parts of other dishes. Therefore, the water droplet removal according to the present technology is not a complete drying, but a means for removing large water droplets from the tableware, and has an effect of reducing nonuniformity of moisture distribution on the tableware or in the drying cabinet. Since the above-mentioned problems such as shortening the drying time are solved by making the water distribution substantially uniform, the present technology can be positioned as a pretreatment of the drying process.

This technology has been developed mainly as an industrial drying accelerating means, miniaturizing means, or defoaming means. Since the focal point is a fixed position, the object (surface) is sent in one direction so as to pass through the focal position. The water was removed while being removed.
JP 2001-252238 A Japanese Patent Laid-Open No. 11-90330

  When the above-described water droplet removal technique using airborne ultrasonic waves is applied to a domestic dish dryer or dishwasher, it is difficult to move the entire surface of the object to be dried through the focal point. This is because it is difficult to transport tableware, which is an object to be dried, in a limited space in home appliances where the installation space must be reduced, and the tableware collapses during transfer. This is because it may be damaged.

  An object of the present invention is to remove a predetermined amount or more of water drops from the entire surface of the tableware without moving the tableware in a state where the tableware is installed in a predetermined arrangement direction or position.

  In order to solve the above-described conventional problems, the tableware dryer of the present invention has an ultrasonic vibrator that vibrates a radiation plate that radiates ultrasonic vibrations in the air and a substantially parabolic surface, and is emitted from the radiation plate. Ultrasonic focusing means for focusing the ultrasonic vibration to a linear or point-like focal position, and control means for controlling the ultrasonic transducer and the ultrasonic focusing means, the ultrasonic focusing means comprising: A focal position for focusing the ultrasonic vibration is variably provided, and the control means operates the ultrasonic vibrator while moving the focal position of the ultrasonic focusing means in the overlapping direction of the tableware. .

  Thereby, it becomes possible to remove a predetermined amount or more of water drops from the tableware without moving the tableware in a state where it is installed at a predetermined position, and the drying time can be shortened.

  The tableware dryer of the present invention can reduce the drying time by removing a predetermined amount or more of water drops from the tableware without moving the object to be dried.

1st invention heats the air in the said tableware basket which installs to-be-dried objects, such as tableware, the drying cabinet which accommodates the said tableware basket, the ventilation fan which introduces external air in the said drying cabinet, and the said drying cabinet Heater, an ultrasonic transducer that vibrates a radiation plate that radiates ultrasonic vibrations into the air, and an ultrasonic vibration that has a substantially parabolic surface and is emitted from the radiation plate at a linear or point-like focal position. Ultrasonic focusing means for focusing, movable rotary reflecting plate for reflecting ultrasonic vibration and bending its traveling direction, driving means for driving the rotating reflecting plate, the ultrasonic transducer , and ultrasonic focusing And a control means for controlling the driving means , wherein the ultrasonic focusing means is provided with a variable focal position for focusing the ultrasonic vibration, and the control means displaces the rotating reflector by the driving means. Let the direction of ultrasonic vibration travel Changing, by the focal position of the ultrasonic wave focusing means and to actuate the ultrasonic transducer while moving the heavy alignment direction of dishes, without moving remain installed dishes in position In addition, a predetermined amount or more of water droplets can be removed from the tableware, and the drying time can be shortened. Further, in addition to scattering the water droplets at the focal position, the ultrasonic waves enter the gaps between the dishes, so that a predetermined amount or more of water drops can be removed from almost the entire surface of the tableware that is overlaid. Thereby, the water spot remaining after drying can be eliminated and the finish can be improved.

In particular, it has a movable rotary reflector that reflects ultrasonic vibration and bends its traveling direction, and a drive means that drives the rotary reflector, and the control means displaces the rotary reflector by the drive means. By changing the traveling direction of the ultrasonic vibration, the focused ultrasonic waves can be applied to almost the entire surface of the multiple dishes stored in the drying cabinet, and a reliable water droplet removal effect can be achieved. Can do.

2nd invention heats the air in the said tableware basket which installs to-be-dried objects, such as tableware, the drying cabinet which accommodates the said tableware basket, the ventilation fan which introduces external air in the said drying cabinet, Heater, an ultrasonic transducer that vibrates a radiation plate that radiates ultrasonic vibrations into the air, and an ultrasonic vibration that has a substantially parabolic surface and is emitted from the radiation plate at a linear or point-like focal position. An ultrasonic focusing unit for focusing, and a control unit for controlling the ultrasonic transducer and the ultrasonic focusing unit, wherein the ultrasonic focusing unit includes a reflection part formed in a substantially parabolic shape, and the reflection changing the curvature of the part and a variable means you focus position to focus the ultrasonic vibrations to freely varies, the control means, said by changing the curvature of the reflective portion ultrasonic vibration by the varying means the focal length for focusing varying, the ultrasonic focusing means By the focal position was so that actuates the ultrasonic vibrator while moving heavy alignment direction of tableware, applying ultrasonic waves focused to substantially the entire surface of a plurality of tableware housed in different distances from the radiation plate And a reliable water droplet removal effect can be exhibited.

3rd invention heats the air in the said tableware basket which installs to-be-dried objects, such as tableware, the drying cabinet which accommodates the said tableware basket, the ventilation fan which introduces external air in the said drying cabinet, Heater, an ultrasonic transducer that vibrates a radiation plate that radiates ultrasonic vibrations into the air, and an ultrasonic vibration that has a substantially parabolic surface and is emitted from the radiation plate at a linear or point-like focal position. An ultrasonic focusing unit for focusing, and a control unit for controlling the ultrasonic transducer and the ultrasonic focusing unit, wherein the ultrasonic focusing unit includes a reflection part formed in a substantially parabolic shape, and the reflection changing the curvature of the part and a variable means you focus position to focus the ultrasonic vibrations to freely varies, the control means, said by changing the curvature of the reflective portion ultrasonic vibration by the varying means Change the focal length to focus and the direction of ultrasonic vibration Was the by the focus position of the ultrasound focusing means was so that actuates the ultrasonic vibrator while moving heavy alignment direction of tableware, a plurality of tableware housed in various distances and directions from the radiation plate Therefore, it is possible to apply a focused ultrasonic wave to almost the entire surface of the film, and to exert a reliable water droplet removal effect.

A fourth invention is, in particular, the control unit of the second or third invention, by which is adapted to change the curvature by controlling the temperature of the plate-like member, can be realized with a simple configuration.

In the fifth aspect of the invention, in particular, the reflecting portion of the fourth aspect of the invention is configured by bonding a plurality of plate-like members having different thermal expansion coefficients, thereby sensing the heat of the drying heater and changing the curvature. Can do.

In the sixth invention, in particular, the tableware drier according to any one of the first to fifth inventions is provided with a tableware basket in which an object to be cleaned such as tableware is installed, and the tableware basket is accommodated to clean the object to be cleaned. In the cleaning tank, a cleaning means for cleaning the object to be cleaned in the cleaning tank, a water supply means for supplying cleaning water to the cleaning tank, a drain means for discharging the cleaning water from the cleaning tank, and the cleaning tank A blower fan that introduces outside air, a heater that heats the air in the cleaning tank, an ultrasonic vibrator that vibrates a radiation plate that radiates ultrasonic vibrations into the air, and a substantially paraboloidal surface from the radiation plate. Ultrasonic focusing means for focusing the emitted ultrasonic vibration to a linear or point-like focal position, and control means for controlling the cleaning means, the blower fan and the heater, and executing the cleaning process and the drying process. More than a predetermined amount left on the tableware after the washing process It is possible to ensure removal of water droplets, followed by a washing step can be performed a drying step, can be quickly and efficiently drying without moving the dishes.

According to a seventh aspect of the invention, in particular, the ultrasonic focusing means of the sixth aspect of the invention has a first focal position for converging ultrasonic vibrations on the bottom of a tableware such as moss or hot water, and the first focal point. By setting the oscillation time of the ultrasonic vibration that oscillates at the position longer than the time at other positions, it is possible to remove water droplets remaining on the bottom of the yarn, which takes a long time to dry, in a short time, and dry the entire table in a balanced manner. Thus, the time required for drying can be shortened, and the thermal stress applied to the tableware can be reduced.

  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)
FIG. 1 is a configuration diagram of a tableware dryer according to the first embodiment of the present invention, and FIG. 2 is a top view showing an arrangement of tableware. A cup-shaped tableware X with a thread bottom at the bottom is placed face down on the tableware basket 2 so that the thread bottom faces upward, and a dish-shaped tableware Y leans against the tableware basket 2 with the food serving surface facing in the same direction. And set in the tableware basket 2. The tableware X is set in the upper tableware basket 2 and stored in the drying cabinet 1, and the tableware Y is set in the lower tableware basket 2 and stored in the drying cabinet 1.

  Tableware Y is arranged so that the main cleaning surfaces overlap each other. Hereinafter, such an arrangement is referred to as an overlapping arrangement, and a direction indicated by an arrow A is referred to as an overlapping direction. The tableware Y is arranged in two rows in the direction of arrow A in the drying cabinet 1, and the tableware X is arranged in a direction orthogonal to the direction in which the tableware Y is installed. 3 shows an arrangement of another example of the tableware Y. The table Y is inclined at a predetermined angle and arranged in three rows, which is advantageous for setting a number of tableware Y.

  FIG. 4 is a front view of the ultrasonic radiation device, and FIG. 5 is a side view thereof. The ultrasonic radiation device is provided at a position communicating with the inside of the drying cabinet 1, and a radiation plate is provided on a vibration surface of a bolted Langevin type ultrasonic transducer 3 via a horn 4 and a rod 5 for amplifying the amplitude. 6 is provided. The radiating plate 6 is provided so as to bend and vibrate in a stripe mode in the long side direction as indicated by a broken line b. The distance d between the radiation direction setting plate 7 and the radiation plate 6 is determined so that the ultrasonic wave propagates mainly upward from the radiation plate 6 into the air.

  The ultrasonic wave radiated into the air is reflected by the reflecting portion 13 of the ultrasonic focusing means 8 formed in a substantially parabolic shape, propagates in the air as shown by the broken line C, and in the state shown in FIG. Focus on. The ultrasonic focusing means 8 of the present embodiment is composed of a plurality of plate-like members having different thermal expansion coefficients, and the focal position is changed from A to B, C, D, E, F, G due to the temperature rise in the drying chamber 1. And move sequentially. A heater 9 is provided at the bottom of the drying chamber 1, and a ventilation port 10 and a blower fan 11 that take in air outside the machine into the drying chamber 1 are provided in the housing for discharging moisture-containing air. An exhaust port 12 is provided in the housing.

Next, the operation and action during drying in the state shown in FIG. 1 will be described. Energization of the ultrasonic transducer 3 is started before the heater 9 is energized, and the ultrasonic wave is propagated as shown by a broken line C and focused at the focal position A. The sound pressure at the focal position A exceeds the threshold of water miniaturization, and water droplets accumulated on the thread bottom of the tableware X located at the focal position A are scattered. As will be described later, when the focal position sequentially moves from A to B to G, the ultrasonic wave propagates downward while repeatedly reflecting the gaps between the plurality of dish-shaped dishes Y, and is defined by the surface shape of the dishes Y. In many positions, the sound pressure of the ultrasonic wave exceeds the threshold for miniaturization, and water droplets are repeatedly scattered.

  As a result, some of the water droplets adhering to the surface of the tableware Y fall to the bottom surface of the drying cabinet 1, and the remaining small water droplets adhere to the surface of the tableware Y relatively uniformly. Thereafter, when the temperature in the drying chamber 1 is increased by energization of the heater 9 and the outside air is introduced by the operation of the blower fan 11, water drops remaining on the tableware are dried.

  FIG. 6 shows the configuration of the ultrasonic focusing means 8, in which two plate-like members 13 a and 13 b having different coefficients of thermal expansion are bonded together. The operation of the movement of the focal position in FIG. 6 (a) from F1 to the focal position in FIG. 6 (b) will be described. FIG. 6A shows the state after normal temperature (at the start of drying), and FIG. 6B shows the state after the temperature is raised by the operation of the heater 9. One end portion 14 a of the reflection portion 13 is fixed to the wall surface of the drying cabinet 1, and the other end portion 14 b is attached so as to move on the arc-shaped rail 15 provided in the drying chamber 1 in the direction of the arrow D.

  When the temperature in the drying chamber 1 rises due to the energization of the heater 9, the curvature of the reflecting portion 13 obtained by bonding the two plate-like members 13a and 13b having different thermal expansion coefficients changes greatly, and the focal length is shown in FIG. It is shortened from f1 in a) to f2 in FIG. At the same time, the reflection direction of the ultrasonic wave moves slightly downward, and the bending angle is sharpened from θ1 to θ2. The ultrasonic transducer 3 and the ultrasonic focusing means 8 are controlled by the control means 25. The control unit 25 controls the focal length and the reflection direction by the reflection unit 13 as well as the control of the heater 9 and the blower fan 11 necessary for the control of the drying operation.

  In this embodiment, the heater 9 that raises the temperature in the drying chamber 1 and the control means 25 that controls the energization of the heater 9 constitute variable means for changing the curvature of the reflecting portion 13.

  As a result, the focal position moves from A to G in the drying chamber 1, and the amplified ultrasonic waves sequentially enter the gaps of the tableware Y and repeat reflection on the surface of the tableware Y to remove water droplets. Water droplets can be removed at most positions in the drying cabinet 1, and the drying time can be shortened compared with a conventional dryer using only warm air by applying warm air from the heater 9 and the blower fan 11. .

  FIG. 7 shows a cross-sectional view of the bottom of the drying cabinet 1. The dish-shaped tableware Y and the tableware basket 2 are in contact with each other by two rod-shaped basket members 2 a, and relatively large water droplets are collected at the contact points. Cheap. An ultrasonic focusing wall 16 that is recessed in a parabolic shape is provided at the bottom of the drying chamber 1 so that the ultrasonic waves are focused along the cage member 2a. The ultrasonic waves introduced from the upper part of the drying cabinet 1 continue to be reflected between the plurality of dish-shaped tableware Y and reach the tableware bottom, but when reaching the tableware bottom, it is assumed that they are scattered considerably. Therefore, a reliable water droplet removal effect can be obtained by focusing again as shown by the arrow e by the action of the ultrasonic focusing wall 16.

  The ultrasonic vibrator 3 does not always have to be operated for water droplet scattering, and sufficient drying performance can be exhibited even in intermittent operation. This is because, as long as the water droplet hits the focal position, the water droplet is refined almost instantly. When it is detected that the reflecting portion 13 is tilted so that the focal position becomes A to G due to the temperature rise in the drying chamber 1, and the ultrasonic vibrator 3 is controlled to intermittently oscillate, the radiation plate 6 and the ultrasonic vibration The life of the child 3 can be extended.

(Embodiment 2)
FIGS. 8-11 shows the block diagram of the dryer with the dishwashing function in the 2nd Embodiment of this invention, and it demonstrates centering on a different part from Embodiment 1. FIG. The tableware X and the tableware Y are stored in the washing tank 17 side by side in a predetermined overlapping direction as in the first embodiment, and also serve as a drying cabinet. The cleaning tank 17 is provided in a watertight structure so that it does not leak outside even if cleaning water is jetted inside. The cleaning water in the cleaning tank 17 is pressurized by a cleaning pump 18 and is supplied from a cleaning means 19 constituted by a rotating nozzle. Sprayed toward tableware X and Y. The sprayed cleaning water gathers in the water storage section 20 provided with the heater 9, is heated by the heater 9, is pressurized by the cleaning pump 18, and circulates to the cleaning means 19.

  In the communication portion 21 between the ultrasonic focusing means 8 and the cleaning tank 17, a rotatable rotary reflecting plate 22 is provided close to the ultrasonic focusing means 8 so as to be able to face the reflection portion 13, and opens and closes the communication portion 21. can do. During the cleaning, as shown in FIG. 8, the communication portion 21 is closed by the rotating reflector 22 to prevent the cleaning water sprayed by the cleaning means 19 from entering the storage portion such as the ultrasonic vibrator 3. ing.

  FIG. 9 shows the configuration of the rotating reflector 22. One end of the rotary reflecting plate 22 is formed in a flat plate shape that is pivotally supported by the shaft portion 23, and is fixed to the wall surface of the cleaning tank 17 by the shaft portion 23. The shaft portion 23 is rotationally driven in the direction of the arrow by a driving means 24 such as a stepping motor so that the angle can be varied with respect to the ultrasonic focusing means 8, and the traveling direction of the ultrasonic wave depends on the angle of the rotary reflector 22. Change. The control means 25 controls the driving means 24 of the rotary reflecting plate 22 as well as the cleaning pump 18 necessary for controlling the cleaning operation.

  Next, the operation will be described. The rotary reflecting plate 22 at the start of drying is set so that the communicating portion 21 is opened and the focal position of the ultrasonic wave is A as shown in FIG. Thereafter, the rotating reflector 22 is gradually rotated to move the focal position sequentially from A to B, C, D, E, F, and G, and the focal position is changed to G as shown in FIG. The ultrasonic transducer 3 operates the ultrasonic transducer 3 for a predetermined time in a state where the rotary reflector 22 is moving.

  Since the tableware dryer with the tableware washing function of this embodiment is cleaned by jetting cleaning water, a relatively large amount of cleaning water remains on the upper surface of the tableware X having a thread bottom after the cleaning is completed. Since the water droplets scattered by the ultrasonic irradiation adhere to the tableware at a lower position, it is preferable to remove the water droplets at a location (A) where a relatively large amount of water droplets such as the yarn bottom accumulate at the initial stage of drying. In order to cope with a relatively large amount of remaining water, it is preferable that the focal position A oscillates ultrasonically for a longer time than other focal positions.

  The heater 9 and the blower fan 11 are started to operate simultaneously with the start of drying. While the water droplets are removed by the aerial ultrasonic wave, the output of the blower fan 11 is relatively small so that the water droplets are at the bottom of the washing tank 18. It is preferable for drying. The rotational speed of the blower fan 11 is maximized after the focal position of the ultrasonic wave moves to G and the water droplet removal is completed. By using both warm air evaporation and ultrasonic water droplet removal, drying can be performed in a short time with only warm air without heating the rinse water by the heater 9 during the rinsing process.

  As described above, the tableware dryer of the present invention can remove a predetermined amount or more of water droplets from the tableware without moving the object to be dried, so that the drying time can be shortened. Also useful as a dishwasher.

The block diagram of the tableware dryer in Embodiment 1 of this invention Top view showing the arrangement of tableware of the tableware dryer The top view which shows the arrangement | sequence of the tableware of the other example of the tableware dryer Front view of the ultrasonic radiator of the tableware dryer Side view of the ultrasonic radiator of the tableware dryer (A) (b) The block diagram of the reflection part of the ultrasonic radiation apparatus of the tableware dryer Cross section of the bottom of the dryer of the tableware dryer The block diagram of the dishwasher in Embodiment 2 of this invention Schematic diagram of the rotating reflector of the dishwasher Action diagram of the rotating reflector of the dishwasher Action diagram of the rotating reflector of the dishwasher Front view of a conventional ultrasonic radiation device Side view of the ultrasonic radiation device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drying cabinet 2 Tableware basket 3 Ultrasonic vibrator 6 Radiation plate 8 Ultrasonic focusing means 9 Heater 11 Blower fan 13 Reflection part 25 Control means

Claims (7)

A tableware basket for installing an object to be dried such as tableware, a drying cabinet for storing the tableware basket, a blower fan for introducing outside air into the drying cabinet, a heater for heating the air in the drying cabinet, and an ultrasonic wave An ultrasonic transducer that vibrates a radiation plate that radiates vibration in the air, and an ultrasonic focusing means that has a substantially parabolic surface and focuses the ultrasonic vibration emitted from the radiation plate to a linear or point-like focal position. A movable rotary reflector that reflects ultrasonic vibrations and bends its traveling direction; drive means for driving the rotary reflector; the ultrasonic vibrator ; the ultrasonic focusing means; and the drive means . And a control means for controlling, the ultrasonic focusing means is provided with a variable focal position for focusing the ultrasonic vibration, and the control means displaces the rotating reflector by the driving means to cause the ultrasonic vibration. the direction of travel is changed, before Tableware dryer to actuate the ultrasonic transducer with the focal position of the ultrasonic focusing means is moved in the heavy alignment direction of the dishes. A tableware basket for installing an object to be dried such as tableware, a drying cabinet for storing the tableware basket, a blower fan for introducing outside air into the drying cabinet, a heater for heating the air in the drying cabinet, and an ultrasonic wave An ultrasonic transducer that vibrates a radiation plate that radiates vibration in the air, and an ultrasonic focusing means that has a substantially parabolic surface and focuses the ultrasonic vibration emitted from the radiation plate to a linear or point-like focal position. And a control means for controlling the ultrasonic transducer and the ultrasonic focusing means, wherein the ultrasonic focusing means changes the curvature of the reflection part and a reflection part formed in a substantially parabolic shape. Te and a varying means you to freely varies the focal position to focus the ultrasonic vibrations, the control means changes the focal length to focus the ultrasonic vibration curvature varying of the reflecting portion by said varying means It is, eating the focal position of the ultrasonic focusing means Tableware dryer to actuate the ultrasonic transducer while moving in heavy set direction. A tableware basket for installing an object to be dried such as tableware, a drying cabinet for storing the tableware basket, a blower fan for introducing outside air into the drying cabinet, a heater for heating the air in the drying cabinet, and an ultrasonic wave An ultrasonic transducer that vibrates a radiation plate that radiates vibration in the air, and an ultrasonic focusing means that has a substantially parabolic surface and focuses the ultrasonic vibration emitted from the radiation plate to a linear or point-like focal position. And a control means for controlling the ultrasonic transducer and the ultrasonic focusing means, wherein the ultrasonic focusing means changes the curvature of the reflection part and a reflection part formed in a substantially parabolic shape. Te and a variable means you focus located in the variable freely focusing the ultrasonic vibration, the control means, a focal length to focus the ultrasonic vibrations by varying the curvature of the reflective portion by said changing means, changing the traveling direction of the ultrasonic vibration, the ultrasonic sound Tableware dryer to actuate the ultrasonic transducer with the focal position of the focusing means is moved in the heavy alignment direction of the dishes. The tableware dryer according to claim 2 or 3 , wherein the control means controls the temperature of the plate-like member to change the curvature. The tableware drier according to claim 4 , wherein the reflecting portion is formed by bonding a plurality of plate-like members having different thermal expansion coefficients. Tableware basket in which objects to be cleaned such as tableware are installed, a cleaning tank for storing the tableware basket and cleaning the objects to be cleaned, cleaning means for cleaning the objects to be cleaned in the cleaning tank, and cleaning water in the cleaning tank Water supply means for supplying water, drainage means for discharging washing water from the washing tank, a blower fan for introducing outside air into the washing tank, a heater for heating the air in the washing tank, and ultrasonic vibration in the air An ultrasonic vibrator that vibrates a radiation plate that radiates to an ultrasonic wave, an ultrasonic focusing means that has an approximately paraboloid and focuses ultrasonic vibration emitted from the radiation plate to a linear or point-like focal position; and The tableware drier according to any one of claims 1 to 5 , further comprising a control unit that controls the cleaning unit, the blower fan, and the heater to execute the cleaning step and the drying step. The ultrasonic focusing means has a first focal position for focusing the ultrasonic vibration on the yarn bottom of tableware such as moss or hot water, and sets the oscillation time of the ultrasonic vibration oscillated at the first focal position to other values. The tableware dryer according to claim 6, which is set longer than the position time.

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