JP2007089655A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher with improved efficiency in drying by actively making drops of washing water fall to remove the drops or reducing the volume of the drops. <P>SOLUTION: The dishwasher comprises a dish basket on which washed objects including the dish are mounted, a rotary nozzle body for spraying washing water toward the objects to be washed, and a heater disposed on the inner bottom side of a washing tub for heating washing water or drying the washed objects. The dishwasher is characterized by an oscillating means for applying oscillation for draining to the dish basket. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dishwasher that improves the drying efficiency by dropping water droplets of washing water that adheres to tableware and a tableware basket when the tableware is dried.

  Japanese Patent Application Laid-Open No. 2000-316774 discloses a technique for dropping water droplets attached to tableware and a tableware basket.

JP 2000-316774 A

  In a dishwasher, when drying tableware in a short time, the amount of washing water adhering to the tableware and the tableware basket greatly affects. In other words, the amount of heat required to evaporate moisture becomes large within a limited amount of heat, and it is essential to reduce these as much as possible.

  In the tableware washing machine shown in the above-mentioned patent document 1, water is dropped by centrifugal force or vibration by rotating the tableware basket forward and backward.

  However, water droplets cannot be dripped well by centrifugal force due to forward / reverse rotation or vibration accompanying forward / reverse rotation.

  In view of the above problems, an object of the present invention is to provide a dishwasher in which washing water is positively removed by dropping or the volume is reduced to improve drying efficiency.

  The present invention relates to a tableware basket on which an object to be cleaned including dishes is placed, a rotating body nozzle body that injects cleaning water toward the object to be cleaned, and an inner bottom side of the cleaning tank. A dishwasher having a heater for heating and drying an object to be cleaned, characterized in that it has a vibration means for applying a draining vibration to a tableware basket.

  According to the present invention, since the tableware basket is vibrated actively by the vibration means, the water droplets of the cleaning water adhering to the tableware and the tableware basket can be well removed or the volume can be reduced. For this reason, the calorie | heat amount of a heater required for drying is used effectively for drying of tableware itself, and can improve a drying efficiency remarkably or shorten drying time.

  FIG. 1 relates to an embodiment of the present invention, and shows a front view of a dishwasher.

  There is a push button 1 for opening and closing the door on the front surface of the main body frame of the dishwasher. When the push button 1 is pressed, the door lock is released, and the upper door 3 and the lower door 4 with the handle 2 are almost simultaneously. open.

  Further, an operation display unit 5 is provided at the lower part of the main body frame, and the dishwasher starts operation by pressing the start switch 6 after selecting the course by turning on the power switch 5 provided here.

  FIG. 2 is related to the Example of this invention, and shows the longitudinal cross-sectional view of a dishwasher.

  In the lower part of the washing tank 8, a washing pump / drainage pump 9 that sucks, pressurizes and discharges the washing water stored in the washing tank, and the pressurized washing water into the upper basket 10 and the lower basket 11 which are tableware baskets. A cleaning nozzle for spraying the cleaning water toward is provided.

  The upper basket 10 stores tableware having a concave portion at the bottom, such as a rice bowl, a soup bowl and a hot water bowl. The upper car 10 is provided with a drive mechanism on one side of the side surface so that it can rotate 45 degrees to the left and right. The washing nozzle is attached to the upper part of the upper car 10 and the lower part or the lateral part of the lower car 11, and the position and the number of the washing nozzles are arbitrary. In the present embodiment, two rotating nozzles 12 (washing nozzles) are arranged in the lower direction of the lower car 11, and a fixed nozzle 13 (washing nozzle) having a plurality of downward jets is arranged above the upper car 10. .

  Although not shown in the figure, the water flow can be switched independently between the lower rotating nozzle 12 and the fixed nozzle 13 by the water flow switching device. By spraying the wash water pressurized by the washing pump / drainage pump 9 onto the tableware from the washing nozzle, the dirt adhering to the tableware in the tableware basket is washed. The leftovers are dropped with washing water, and the leftovers are filtered by the leftover filter 14 and removed.

  The filtered washing water is used to wash the tableware 15 stored in the upper basket 10 and the lower basket 11 while being circulated by the washing pump / drainage pump 9. Below the leftover filter 14 is a heater 16 for heating cleaning water.

  When washing and rinsing are completed, the drying fan 17 for blowing air for drying the tableware 15 and the warm air heater 18 for heating the air blown from the drying fan 17 are operated to dry the tableware 15.

  PTC is used as the heat source for the warm air heater, and the input is reduced against overheating and works in a safe direction. A thermistor 19 for detecting the temperature of the cleaning water is provided in the cleaning tank.

  The thermistor 19 is conventionally fixed integrally with a resin when the washing tank 8 is formed. Since a time delay is increased and a detection error is increased due to a resin layer with poor thermal conductivity, the structure of the embodiment of the present invention directly protrudes into the cleaning tank. For this reason, an outer shell made of stainless steel or ceramic having good corrosion resistance is used.

  FIG. 3 relates to an embodiment of the present invention, and shows a process diagram of a dishwasher.

  After the power switch is turned on, the course is set, and when the start button is pressed, the washing is automatically performed, and rinsing (1), rinsing (2), heating rinsing, and drying are performed, and the operation is automatically stopped.

  In washing, the temperature of the washing water is increased to about 65 ° C. It takes about 25 minutes from 20 ° C. at room temperature. Heat rinsing raises the temperature of the wash water to about 75 ° C. In the drying, the PTC heater or the sheathed heater is heated to blow air, and hot air is circulated in the cleaning tank and exhausted.

  The higher the temperature of heating and rinsing, the more heat is accumulated in the tableware, so the time can be shortened during drying. In addition, the drying time can be shortened with the same heater capacity as the amount of washing water adhering to tableware is small. In the state where the heating rinsing is completed, a large amount of the washing water adheres to the tableware and the tableware basket.

  FIG. 4 relates to an embodiment of the present invention and shows a tableware basket 41 fitted with a tableware basket guide 40 and a cam structure shaft 43 fixed to the guide rail 42.

  The cam structure shaft 43 serves as a vibration generating means for generating vibration, and is inserted using the guide rail 42 as a bearing. The guide rail 42 itself is not used directly depending on the number of rotations and load of vibration generation, but is fixed via a bearing (not shown) made of another material.

  In addition, about the thing in which the guide rail of the tableware basket 41 directly comprises a part of washing tank and is integrated, the part is used.

  FIG. 5 relates to an embodiment of the present invention, and shows a partial cross-sectional view of a state where a tableware basket guide 40 is mounted on a guide rail 42.

  The cam structure 44 (cam) of the cam structure shaft 43 related to the vibration means is larger than the groove 45 of the guide rail 42.

  Thereby, even if the mounting of the cam structure shaft 43 varies, the tableware basket guide 40 can be stably stored. Further, since the shaft 43 is fixed to the guide rail by the circular portion 46 with the groove 45 interposed therebetween, the shaft 43 is smoothly rotated.

  At both ends of the cam, R remains 1/3 of the cam plane. The cam structure portion 44 (cam) in contact with the tableware basket guide 40 has a large R so that the contact pressure when contacting the tableware basket guide 40 is substantially the same between the R portion and the plane portion. Has been reduced.

  When the stroke of the cam portion is lower than the groove portion of the guide rail 42 in the cross section of the cam structure shaft 43, the distance M is the distance between the groove portion and the shaft diameter. In order for the tableware basket guide 40 to be easily mounted, it is preferable that L> M.

  Further, since the cam structure portion 44 (cam) is in direct contact with the resin-molded tableware basket guide 40, the surface roughness is reduced by buffing to reduce wear.

  FIG. 6 relates to the embodiment of the present invention, and shows a partial cross section of the drive portion (vibration means) of the guide rail 42.

  In the case of this embodiment, a resin sleeve bearing 60 is press-fitted and attached to the side wall of the cleaning tank 8, and a drive unit 61 (motor) having a built-in speed reduction mechanism is attached to the cleaning tank 8 via a mounting plate 62 with a screw 64. It is fixed by.

  The shaft 43 of the drive unit 61 is inserted to the end of the guide rail 42 through a resin sleeve bearing 60.

  The vibration means includes a drive unit 61 (motor), a shaft 43, and a cam structure unit 44 (cam).

  Since the bearing is in direct contact with the cleaning water, a resin sleeve bearing 60 having good corrosion resistance is used. In the case where the rotational friction torque increases due to an increase in the load of the tableware due to the increase in the number of dishes, a water resistant plastic ball bearing may be used in order to reduce the loss due to the rotational friction and to reduce the size of the drive unit.

  A rotational position detector (not shown) is also provided. The driving unit 61 (motor) is controlled so that the position of the flat surface of the cam structure unit 44 is on the upper side based on the detection information of the rotational position detector. This is for the tableware basket guide 40 to enter smoothly without being caught.

  FIG. 7 relates to the embodiment of the present invention and shows the drying time-temperature characteristics in the washing tank.

  The characteristics when a large amount of water droplets for washing adhere to the tableware and the tableware basket are as shown by the A curve. Since the temperature just before drying uses about 75 ° C. washing water by rinsing with heat, this temperature almost starts, and the temperature decreases with the passage of the blowing time.

  This is because the hot air from the heater is used for the amount of heat to evaporate the water adhering to the tableware and the tableware basket, and therefore does not reach the temperature in the tank.

  In this example, the drying time is 25 minutes, but the temperature in the tank does not rise within this time range, and a large amount of water droplets remain in the tableware basket. The drying efficiency at this time is about 50%. there were. On the other hand, those with a reduced amount of attached water droplets have the characteristics of B, and are currently used in this range.

  In the embodiments of the present invention, the vibration of the tableware was applied to the tableware basket using the vibration means, and the waterdrops adhering to the tableware or tableware basket were actively shaken down or the volume of the waterdrop was reduced. As a result, the drying time-cleaning tank temperature characteristics were improved as shown in C.

  Compared with the present drying time-temperature characteristic B in the cleaning tank, the temperature drop during the drying time-cleaning tank temperature characteristic C is also smaller.

  This is because the amount of water droplets attached is small, so that the amount of heat when blowing hot air is used to evaporate the water droplets and is used to raise the temperature in the washing tank.

  In addition, the temperature in the washing tank suddenly rises before the end of the drying time. This is because the absolute amount of moisture adhering to the tableware is small, so that evaporation is performed quickly by the heat generated when the hot air is blown, and the heat is used to raise the temperature in the washing tank.

  The operation of the vibration means will be described.

  The tableware basket guide 40 attached to the tableware basket 41 is placed on the guide rail 42 and inserted all the way into the washing tank.

  On the back side of the groove portion 45 of the guide rail 42, the circular portion 46 of the cam structure shaft 43 protrudes above the groove portion 45, and the cam structure portion 44 is below it. The rotation of the cam structure shaft 43 causes the tableware basket guide 43 to vibrate up and down once for each rotation.

  The frequency changes according to the rotation speed of the cam structure shaft 43. The amplitude is adjusted by the magnitude of M.

  The vibration conditions include the frequency and amplitude. The frequency varies depending on the amplitude and the shape of the tableware basket 41, the tableware mounting form, the weight, etc., but the frequency at which water drops are likely to drop is selected experimentally. Good.

  In the present embodiment, the frequency is in the range of 0.1 to 10 Hz. In addition, a larger amplitude is more effective. However, if the amplitude is too large, the tableware may be impacted and damaged, so in this embodiment (0.5-2) mm.

  In addition, the excitation position is positioned at the corner in this embodiment. If the torque is sufficient, the effect is great if vibration is applied at the center. With respect to the vibration timing, when the heating rinse is completed, the spraying of the cleaning water from the cleaning nozzle ends, and the cleaning water from the top plate stops dripping, water droplets are efficiently removed.

  Further, by performing stepwise in the beginning and in the middle, the operation time of the vibration means can be shortened and the cam part life can be extended. In particular, immediately after the end of the heating rinse, since the temperature is high and the viscosity of the water droplet is low, the initial vibration is effective because it is easy to drop by vibration.

  For this reason, the initial time may be longer than others. The water droplets of the washing water adhering to the tableware and the tableware basket were dropped onto the bottom of the washing tank by vibrating the tableware basket, and the volume or volume could be reduced. As a result, as shown in curve C, the drying time can be reduced by about 25% in this embodiment.

  In addition, utilization of the various vibration excitation sources using an electromagnetic vibration and a pump vibration can be considered for a vibration means.

The front view of the dishwasher concerning the Example of this invention. The vertical cross-sectional view of the dishwasher concerning the Example of this invention. The process of the dishwasher is related to the embodiment of the present invention. The cam structure shaft which concerns on the Example of this invention and was fixed to the guide rail with the tableware cage | basket | car with the tableware basket guide mounted | worn is shown. FIG. 4 is a partial cross-sectional view of a state in which a tableware basket guide is mounted on a guide rail according to an embodiment of the present invention. The partial cross section of the drive part of the guide rail 42 is related to the Example of this invention, and is shown. This relates to the embodiment of the present invention, and shows the drying time-temperature characteristics in the washing tank.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Push button, 2 ... Handle, 3 ... Upper door, 4 ... Lower door, 5 ... Operation display part, 6 ... Start button, 8 ... Cleaning tank, 9 ... Cleaning pump and drainage pump, 10 ... Upper basket, 11 ... Lower basket, 12 ... rotating nozzle, 13 ... fixed nozzle, 14 ... leftover filter, 15 ... tableware, 16 ... heating heater, 17 ... drying fan, 18 ... warm air heater, 19 ... thermistor, 40 ... for tableware Car guide, 41 ... Cage for tableware, 42 ... Guide rail, 43 ... Cam structure shaft, 44 ... Cam structure, 45 ... Groove, 46 ... Circular part, 60 ... Sleeve bearing, 61 ... Drive part, 62 ... Mounting plate, 64: Screw.

Claims (6)

A cleaning tank, a dish case placed in the cleaning tank, on which an object to be cleaned including dishes is placed, a rotating nozzle body for injecting cleaning water toward the object to be cleaned, and an inside of the cleaning tank In the dishwasher provided on the bottom side and having a heater for heating the cleaning water and drying the object to be cleaned,
A dishwasher comprising vibration means for applying draining vibration to the tableware basket. A cleaning tank, a dish case placed in the cleaning tank, on which an object to be cleaned including dishes is placed, a rotating nozzle body for injecting cleaning water toward the object to be cleaned, and an inside of the cleaning tank A heater provided on the bottom side for heating cleaning water and drying the object to be cleaned;
In the dishwasher where the operation changes in the order of washing process, rinsing process, heating rinsing process, drying process,
A dishwasher characterized by applying a draining vibration to the tableware basket after the washing water jetting of the rotating body nozzle body in the heating rinsing step is completed. A cleaning tank, a dish case placed in the cleaning tank, on which an object to be cleaned including dishes is placed, a rotating nozzle body for injecting cleaning water toward the object to be cleaned, and an inside of the cleaning tank A heater provided on the bottom side for heating cleaning water and drying the object to be cleaned;
In the dishwasher where the operation changes in the order of washing process, rinsing process, heating rinsing process, drying process,
A dishwasher characterized by applying a draining vibration to the tableware basket after a lapse of a predetermined time after the washing water jetting of the rotating body nozzle body in the heating rinsing step is completed. The dishwasher according to claim 2 or 3,
A dishwasher comprising vibration means for applying the draining vibration. The dishwasher according to claim 1 or 4,
A guide rail for placing the tableware basket movably in the front-rear direction is provided in the washing tank,
The vibration means is driven by the driving unit, and is provided with a rotating shaft that is rotatably provided on the guide rail. The vibrating unit is provided on the rotating shaft and abuts on the side of the tableware basket to cause vibration. A dishwasher comprising a cam. The dishwasher according to claim 5, wherein
The dishwasher is controlled so that the flat surface of the cam comes to the upper side and rotation of the rotating shaft stops.

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