JP2007215884A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that washing water is accumulated at the bottom of a teacup after washing and rinsing, it is not completely dried within drying time and a drying rate is lowered while it is needed to effectively use a space volume in order to arrange many dishes, a nozzle for washing is normally arranged in a vertical direction and thus the teacup is vertically arranged with the bottom up so that the washing water is not easily accumulated in a dishwasher. <P>SOLUTION: By directly blowing heated air to the bottom of the teacup, the temperature of the teacup is raised, also volatilization is accelerated even by blowing weak air, the drying speed of the washing water at the bottom is accelerated, and thus drying efficiency is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dishwasher that promotes the evaporation of washing water that accumulates at the bottom of a teacup bowl in order to improve the drying rate of the tableware.

  JP 2000-254061 A discloses a document relating to the drying efficiency of a dishwasher, in which water is blown off by spraying the thread bottom of a tea cup with a nozzle tube.

JP 2000-254061 A

  In a dishwasher, if a large number of dishes are to be arranged, it is necessary to use the space volume effectively. For this reason, it is essential to place the teacups in the vertical direction with the thread bottoms up. In addition, since the nozzles for washing are usually arranged in the vertical direction, the tea cups are arranged vertically with the thread bottoms up so that washing water does not collect easily. For this reason, there is a problem that the washing rate accumulates on the thread bottom of the tea cup after washing and rinsing, and the drying rate is lowered because it cannot be completely dried within the drying time.

  An object of the present invention is to provide a dishwasher that promotes volatilization of the remaining water of the washing water accumulated at the yarn bottom and improves the drying rate.

  In the present invention, the air blown directly to the bottom of the tea cup is performed.

  As a result, the temperature of the hot water bath was raised and volatilization was promoted by a relatively weak air flow, and the drying efficiency was improved by increasing the drying speed of the washing water at the yarn bottom.

  According to the present invention, the remaining amount of washing water is accumulated, and the evaporation of the remaining water at the thread bottom of the tea cup is promoted, so that the drying time can be shortened by weak air blowing, and the drying can be performed within the drying time. The drying efficiency of can be improved.

  The front view of the dishwasher which is one Example of this invention is shown in FIG. The door lock is released by pushing the door opening / closing push button 1 on the front surface, and the lower door 3 and the upper door 4 are opened almost simultaneously by pulling the lower door 3 with the handle 2 forward. In addition, an operation display unit 5 is provided at the lower portion, and the operation is started by pressing the start switch 8 after the power switch 6 is turned on and the course 7 is selected.

  FIG. 2 is a longitudinal sectional view of a dishwasher which is an embodiment of the present invention. In the lower part of the washing tank 21, the washing water stored in the washing tank is sucked in, pressurized and discharged, and the washing pump / drainage pump 22 and the pressurized washing water are directed toward the upper basket 23 and the lower basket 24. A cleaning nozzle for spraying is provided. In the present embodiment, the cleaning nozzle is provided with an upper nozzle 25 and a lower nozzle 26. The upper nozzle is a rotating nozzle, but may be a fixed nozzle.

  Further, the cleaning nozzle may be provided on the lower front surface or the side surface of the upper basket 23, and the position and the number of the cleaning nozzles are arbitrary.

  The water flow switching device 20 can switch the cleaning water to each cleaning nozzle independently. The residual water and dirt adhering to the tableware 27 are cleaned by spraying the cleaning water pressurized by the cleaning pump / drainage pump 22 onto the tableware 27 by the cleaning nozzle.

  Below the cleaning tank 21 is a heater 29 for heating the cleaning water. When cleaning and rinsing are completed, there is a drying fan 30 that blows air to dry the tableware 27. The air blown from the drying fan 30 is heated by the warm air heater 31 to dry the tableware 27. PTC is used as a heat source for the hot air heater 31 and resistance to overheating increases, input decreases, and works in a safe direction.

  The air heated by the warm air heater 31 passes through the wall surface air passage 60 and is blown to the upper surface of the thread bottom of the tea cup 62 from the air outlet 61 provided on the wall surface in the washing tank. The blower openings 61 are arranged in the horizontal direction so that they are almost equal to the arrangement width of the tea cups 62 so that the air blows against the thread bottom of the tea cups 62. The air is blown directly toward the yarn bottom.

  Since the PTC can be installed in the middle of the air passage for the drying fan 30 and the air flow, the air velocity of the air for the drying fan 30 can be blown without decreasing to the outlet of the air blowing port 61, so that the amount of evaporated water is increased. Can do. Further, since the temperature drop is small at the outlet of the air blowing port 61, the amount of evaporated water can be increased similarly.

  When a sheathed heater is used as the heating source, the blowing speed cannot be sealed when the large area of the sheathed heater is blown, and the blowing speed is reduced, and the amount of evaporated water is smaller than that of PTC. The blower opening 61 is provided with a door 63 that opens and closes with pressure during blowing.

  You may use a drying rate for evaluation of the drying condition of tableware. The drying rate was defined as the ratio of the number of water drops on the tableware after the drying process divided by the total tableware. Therefore, in the case of the tableware with the thread bottom placed on the top, the teacup remains as a table that cannot be dried within the drying process time. The reason for this is that, among other dishes, the tea cups are placed vertically to increase the loading efficiency, and the wash water collected at the thread bottom of the tea cups is deep, because about 1 to 3 ml of wash water accumulates in a small area. Becomes supersaturated, making it difficult to evaporate moisture.

  For this reason, in order to promote volatilization, it is necessary to eliminate the supersaturated surface layer of the surface by directly blowing the dry air to the surface of the yarn bottom while it is first blown from the air blowing port 61 where the temperature and the air volume do not decrease. It is necessary to increase the amount of evaporated water by increasing the temperature.

  Further, a guide 64 for preventing direct irradiation from the lower nozzle 26 is provided. The door 63 is closed at the position of the dotted line when there is no air flow, that is, when it is not the drying process. Since the door 63 is made of a flexible material such as flexible rubber, the door 63 has a structure in which the door 63 hangs down under its own weight when there is no air flow. Although not shown in the drawing, a plurality of hot water baths are arranged from the front toward the back, so that the width corresponding to the width of the hot water outlet 61 is taken.

  FIG. 3 shows the operation process of the dishwasher. After the power switch 6 is turned on, the course is set, and when the start switch 8 is pressed, the washing is automatically performed, rinsing (1), rinsing (2), heating rinsing, and drying are performed, and the operation is automatically stopped. In the washing, the temperature of the washing water is raised to about 65 ° C. by the heater 29 for heating. It takes about 25 minutes from 20 ° C at room temperature. Further, in the case of rinsing with heat, the temperature of the washing water is raised to about 75 ° C., and the tableware is heated to shorten the drying time in the drying step and to sterilize the tableware.

  In the drying, the hot air heater 31 is operated to circulate hot air heated from the drying fan 30 in the washing tank to evaporate the washing water adhering to the tableware and exhaust it to the outside.

  FIG. 4 shows a control circuit of the dishwasher. The commercial power source 40 is connected to various loads and a DC power source rectifier circuit 43 through an outlet 41, a power switch 6, and a power fuse 42. A DC power supply having a lower voltage than the DC power supply rectifier circuit 43 is supplied to the main control circuit 44 and the drive circuit 45 mainly composed of a microcomputer.

  In this embodiment, the drive circuit 45 mainly uses a relay. The DC power supply rectifier circuit 43 uses a switching power supply. The detection signal of the thermistor 33 water level sensor 48 for detecting the washing water temperature is read by the main control circuit 44 and various controls are performed.

  The operation display unit 5 displays information related to the operation of the dishwasher according to instructions from the main control circuit 44. Various loads are connected to the commercial power supply 40 via a full load switch 49.

  A thermo switch 50, a thermal fuse 51, and a thermo switch 52 are connected in series to the heater 29 using a sheathed heater. The thermistor 33 detects the water temperature of the washing water during washing and rinsing, and controls the water temperature by turning the heater 29 on and off. Moreover, the temperature in the washing tank is detected during drying.

  The full load switch 49 is turned on / off by the drive circuit 45 in accordance with an instruction from the main control circuit 44. The water supply electromagnetic valve 53 is turned on / off by the drive circuit 45 in accordance with an instruction from the main control circuit 44.

  The switching valve motor 54 (not shown) is turned on / off by the drive circuit 45 in accordance with an instruction from the main control circuit 44.

  The washing pump / drainage pump 22 functions as a washing pump and a drainage pump by forward / reverse rotation, and the washing pump switch 22a and the drainage pump switch 22b are turned on / off by the drive circuit 45 in accordance with instructions from the main control circuit 44.

  The transformer 55 for driving the drying fan is connected to the commercial power supply 40 via the full load switch 49 on the primary side. A rectifier 56, a drying fan 30, and a drying fan switch 30 a are connected to the secondary side of the transformer 55, and an on / off operation is performed by the drive circuit 45 in accordance with an instruction from the main control circuit 44.

  FIG. 5 shows the relationship between the blowing time and the amount of evaporated water when the blowing speed during drying is constant and the temperature is changed. Curve A has a blowing speed of 0.8 m / sec and a blowing temperature of 40 ° C, and curve B has a blowing speed of 0.8 m / sec and a blowing temperature of 45 ° C. The relationship between time and the amount of evaporated water is shown when the blown air is performed. The higher the blast temperature, the greater the amount of evaporated water per unit time. Since 1 to 3 ml of washing water accumulates at the thread bottom of the tea cup, it takes 30 to 90 minutes to completely dry under the condition of curve A.

  FIG. 6 shows the relationship between the blowing time and the amount of evaporated water when the blowing speed is changed at a constant blowing temperature of 40 ° C. Curve A shows the relationship between the time and the amount of evaporated water when the blowing speed is 0.8 m / sec, curve C shows the blowing speed of 1 m / sec, and curve D shows the blowing speed of 0.1 m / sec. Curve D is a conventional air blowing method, and the air blowing speed at the thread bottom of the tea cup is extremely low because the air does not blow directly on the thread bottom of the tea cup.

  For this reason, the amount of evaporated water per hour is about 1/5 of curve A. There is no difference in the amount of evaporated water per hour between curve A and curve C. The wash water collected on the thread bottom of the tea cup is saturated about a few millimeters from the surface within a small area, so the air in this layer is replaced. This is because if the wind speed is higher than that, the amount of evaporation will be saturated and will not change much.

  FIG. 7 shows a partial view of the air outlet 61 according to one embodiment of the present invention as viewed from above. A region A indicates a region where the tea cup 62 is disposed. The air outlet 61 is substantially equal to the width of this region. The width is such that air blows to the bottom of the tea cup. Thereby, even if the sizes of the tea cups are different, since the air is covered in the region, the washing water at the bottom of the tea cups can be dried without any problem. When the nozzle is used, the position is fixed. Therefore, when the size of the tea cup changes, the position shifts and a portion where the air blows does not occur, and a tea cup that does not dry out appears and the drying rate decreases.

  In this embodiment, it is necessary to remove the layer of saturated vapor pressure at the bottom of the yarn in order to promote the evaporation of the residual water accumulated in the yarn bottom of the tea cup with the largest amount of washing water per unit area. In order to achieve this, the amount of evaporated water per unit time was increased by increasing the blowing speed at a high blowing temperature by using the blowing outlet 61 of the heating air for drying as the thread bottom of the tea cup.

  Thereby, compared with the conventional drying system, ie, the system which blows air to the whole washing tank 21, the drying time in the thread bottom of the tea cup can be reduced to about 1/5.

  Further, in order to reduce the remaining water amount at the bottom of the tea cup, the remaining water amount can be reduced by tilting the thread bottom 62 of the tea cup at about 15 degrees.

  In addition, since the air outlet 61 is located closest to the drying fan 30 and the warm air heater 31, the air blowing pressure and temperature are the highest in the cleaning tank 21. In this state, the drying air hits the thread bottom of the tea cup with the slowest drying, so that the entire drying time can be efficiently reduced even with the drying fan 30 having the same capacity. Moreover, since the blowing pressure and temperature can be reduced within the same drying time, the capacity of the drying fan 30 and the warm air heater 31 can be reduced.

  Since the position of the air blowing port 61 receives the injection of the lower nozzle 26, a guide 64 is attached to the cleaning tank 21 so that the cleaning water does not enter directly. Since the air outlet 61 cannot cope with a complicated water flow only by the guide 64, the door 63 is closed because the air blowing is stopped when washing and rinsing are performed by attaching the door 63 that opens and closes by air blowing during drying. . Since the air is blown during drying, the door 63 is opened, and the heated air is blown to the thread bottom of the tea cup and dried. The door 63 is positioned so as not to be affected by direct irradiation by the guide 64.

  Since air is blown directly onto the thread bottom of the tea cup, it is not necessary to set the blowing temperature too high. Therefore, by setting the blowing temperature at about 40 to 60 ° C., it is possible to dry even delicate dishes, that is, plastic dishes.

The front view of the dishwasher which is one Example of this invention is shown. The longitudinal cross-sectional view of the dishwasher which is one Example of this invention is shown. The operation | movement process of the dishwasher which is one Example of this invention is shown. The block diagram of the control circuit of the dishwasher which is one Example of this invention is shown. The relationship between the blowing time and the amount of evaporated water when the blowing speed during drying is constant and the temperature is changed is shown. The relationship between the blowing time and the amount of evaporated water when the wind speed is changed at a constant blowing temperature of 40 ° C. is shown. The partial view which looked at the ventilation opening which is one Example of this invention from the upper surface is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 ... Washing tank, 22 ... Cleaning pump and drainage pump, 23 ... Upper basket, 24 ... Lower basket, 25 ... Upper nozzle, 26 ... Lower nozzle, 27 ... Tableware, 29 ... Heating heater, 30 ... Drying fan,
31 ... Heater for warm air, 61 ... Blower, 63 ... Door.

Claims (5)

  A main body of the washing machine in which the washing tub is placed, a table detachably placed in the washing tub, a tableware for placing tableware, a washing nozzle for injecting washing water into the washing tub, and a washing water in the washing nozzle A cleaning pump for supplying water, an openable / closable door for covering the front side of the cleaning tank, a heater for heating the cleaning water provided on the bottom side of the cleaning tank, and a drying fan for sending air A dishwasher characterized in that the heated air is blown directly from the air outlet to the thread bottom of a tea cup with the thread bottom on the upper side.   2. The dishwasher according to claim 1, wherein PTC is used for the warm air heater.   2. The dishwasher according to claim 1, further comprising a door that is closed when washing and is opened by blowing air pressure when blowing.   2. The dishwasher according to claim 1, wherein the width of the air blowing port is equal to or greater than the width region of the thread bottom of the tea cup.   2. The dishwasher according to claim 1, wherein the teacup bowl is placed vertically in the tableware basket, and the thread bottom of the teacup bowl is directed upward.

Images