JP2007215882A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher for saving water by using steam and heated washing water together since beef tallow and other grease are incompletely washed and the effect of saving water is not clearly achieved by the conventional system of steeping spots just with steam in order to reduce the using amount of washing water. <P>SOLUTION: The dishwasher is provided with an exclusive boiler for generating a large amount of the steam, the temperature of dishes inside a washing chamber is efficiently raised in a short time by the steam, fats and oils are dissolved, and the fats and oils are washed with dew-condensed moisture. A small amount of the washing water is heated by a heater to such a temperature that the fats and oils are not hardened, the washing water is jetted from a rotary nozzle body, a main washing process is performed, and thus the water is saved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a dishwashing machine in which dirt is softened with water vapor, and persistent dirt is washed away with less washing water.

  A dishwashing machine that uses water vapor to clean stains that are difficult to wash is described in, for example, Japanese Patent Application Laid-Open No. 2003-235778 (Patent Document 1).

  Moreover, the tableware washing machine provided with the spray water supply means is described in Unexamined-Japanese-Patent No. 2001-275921 (patent document 2), for example.

JP 2003-235778 A JP 2001-275922 A

  In the present invention, in order to reduce the amount of washing water used, the conventional method in which dirt is swollen only with water vapor is incompletely washed against beef tallow and other oil stains, so that it is difficult to save water.

  An object of this invention is to provide the dishwasher which aimed at water saving more.

  In order to achieve the above object, the dishwasher of the present invention is provided with a dedicated boiler for generating a large amount of water vapor, and the steam is used to efficiently raise the temperature of the tableware in the washing room in a short time to dissolve the fat and oil. It is characterized by flowing oil and fat with condensed moisture, heating a small amount of cleaning water with a heater to a temperature at which the oil and fat does not harden, spraying the cleaning water from the rotating nozzle body, and saving water by making it the main washing process To do.

  ADVANTAGE OF THE INVENTION According to this invention, the tableware to which fats and oils adhered, or the tableware to which the dried rice grain adhered was well wash | cleaned and saved water with water vapor | steam and less heat washing water than before.

  Embodiments of the present invention will be described with reference to the drawings.

  First, a description will be given in order from the outline of the dishwasher shown in FIGS.

  FIG. 1 shows a perspective view of the main body of the dishwasher. The outer frame 1 is provided with an upper door 2 and a lower door 3 that open and close up and down. The upper door 2 is provided with a transparent window 4 and an exhaust port 5 for discharging water vapor during drying. On the lower surface of the lower door 3 is a display operation unit 8 for operating the dishwasher.

  The upper lid 2 has a transparent window 4 through which the inside of the washing chamber 11 can be looked into and the washing state of the dishwasher can be visually observed.

  FIG. 2 shows a longitudinal sectional view of the dishwasher. A reservoir 10 for storing cleaning water is provided at the bottom of the cleaning chamber 11. Wash water is poured into the reservoir 10 and collected. The amount of washing water stored is about 2.7 liters. The lower door 3 is provided with a push button 6 for opening the door and a handle 7 for opening the lower door 3.

  The cleaning chamber 11 is opened and closed by the upper lid 2 and the lower lid 3. The upper lid 2 opens and closes so as to rotate along an arc formed from the front surface to the upper surface of the main body outer frame 1. The lower lid 3 opens and closes with the lower end side as a fulcrum. The opened lower lid 3 is placed in a substantially horizontal state.

  The reservoir 10 is provided in front of the bottom of the cleaning chamber 11 and has a bowl shape extending in the lateral direction. In this bowl-shaped storage section 10, a heater 12 made of a heating wire of a sheathed heater is provided.

  Below the heater 12 is provided a lower protective cover 13 having a bowl shape that protects the reservoir 10 made of synthetic resin from heat. An upper protective cover 14 is provided on the heater 12 so as to cover the heater 12 from above. The upper protective cover 14 is provided with a number of flow holes 15 having a diameter of several millimeters. The upper / lower protective covers 14, 13 are formed of a stainless steel plate.

  In the cleaning chamber 11, there are a lower rotary nozzle body 16 and an upper rotary nozzle body 17, and the cleaning water pressurized by the cleaning / drainage pump 37 is distributed to each rotary nozzle body by the water flow switching device 36 (FIG. 3). ing. There are a plurality of rotating nozzle bodies, and there are two lower rotating nozzle bodies 16, and the supply of washing water is switched by the water flow switching device 36 to shorten the circulation path, and the amount of circulating water is reduced by supplying each rotating nozzle body alone. The amount of washing water returned to the washing and drainage pump 37 is increased to prevent air from being caught.

  Further, a lower basket 18 and an upper basket 19 are arranged in the cleaning chamber 11 so that large dishes such as a large dish can be put in the lower basket 18.

  The water vapor spray nozzle 20 is provided on the side surface of the cleaning chamber 11. Since the water vapor spray nozzle 20 on the side surface is located above the platter mounted on the lower basket 18, it is sprayed directly on the tableware, so that the temperature of the tableware easily rises and dirt is easily removed. Further, since the water is sprayed from the water vapor spray nozzle 20 because it is disposed in the substantially central portion of the cleaning chamber 11, the water vapor is well diffused into the tank of the cleaning chamber 11.

  FIG. 3 shows a configuration for performing cleaning with steam and heated cleaning water of the present invention.

  Water supply is performed by a water supply hose (not shown) connected to a water tap. The water supply hose is provided with a water supply electromagnetic valve 47 and is controlled to be turned on and off by the main control circuit 65.

  A water supply pipe 30 communicates with the boiler water storage tank 31 after the water supply electromagnetic valve 47. When the amount of water supplied from the water supply pipe 30 exceeds the holdable amount in the boiler water storage tank 31, the absorbed water overflows and the overflow is stored in the storage unit 10. The boiler storage tank 31 is supplied to the boiler 33 by a boiler water supply pump 32.

  Water vapor generated in a boiler 33 having a heater (not shown) is ejected from the vapor spray nozzle 20 through the water vapor passage 34 and fills the washing chamber 11 to condense with low temperature dishes, and at the same time raise the temperature of the dishes. Condensed water dissolves and removes oil and fat from the tableware.

The amount of water used as water vapor was, for example, 150 to 400 ml. The heater capacity used for the boiler 33 was 600 to 900 W. The capacity of the heater 12 is 800 to
Since 1100 W is used, under the use of a commercial power supply, when both are used simultaneously, control is performed so that the power is 1500 W or less or the current is 15 A or less.

  When water vapor is generated, the heater capacity of the boiler 33 is set to 100%, and the remaining capacity is controlled by turning on / off the heater 12 for washing water heating. At this time, if the balance between the time for generating water vapor and the time for heating the cleaning water is balanced as much as possible, the cleaning can be started immediately after the generation of water vapor, so that time can be saved.

  In the storage tank 10 in the cleaning chamber 11, 1 liter, which is less than 2.7 liters of the normal amount of use, is used as the amount of water stored by pre-washing. To do. In the case of the present embodiment, since the capacity with respect to the depth of the storage tank 10 is 60 ml with respect to the depth of 1 mm, the water level sensor 27 detects that the water level is about 17 mm, and the water supply electromagnetic valve 47 is turned off.

  The temperature of the washing water is heated to 45 ° C. or higher at the time of circulation. When spraying with water vapor is finished, the washing water is pressurized by the washing and draining pump 37 and alternately rotated downward by the water flow switching device 36. It is supplied to the nozzle body 16 and sprayed for cleaning. Accordingly, since the water vapor penetrates into the dirt with the steam raised in temperature and softens the dirt, the dirt is often removed because the dirt is easily removed. Further, since the amount of washing water is reduced, the detergent concentration is increased, the emulsifying action of the oil and fat is promoted, and the soiling is improved.

  The control circuit of the dishwasher will be described with reference to FIG.

  The commercial power source 60 is connected to various loads and a DC power source rectifier circuit 64 through an outlet 61, a power switch 62, and a power fuse 63. Direct current is supplied from a DC power supply rectifier circuit 64 to the main control circuit 65 and the drive circuit 66 mainly composed of a microcomputer.

  The detection signals of the thermistor 67 and the water level sensor 27 are read by the main control circuit 65 and various controls are performed. The display operation unit 8 performs display and various inputs related to the operation of the dishwasher according to instructions from the main control circuit 65.

  Various loads are connected to the commercial power supply 60 via the full load switch 80.

  The circuit of the heater 12 using a sheathed heater has a thermo switch 81, a temperature fuse 82, and a thermo switch 83 connected in series. The circuit of the heater 12 is connected to the commercial power source 60 through the full load switch 80.

The thermo switch 81, the temperature fuse 82, and the thermo switch 83 are provided on the lower protective cover 13 in the vicinity of the heater 12. When the heater 12 is overheated exceeding 300 ° C., the thermo switch 81, the temperature fuse 82, and the thermo switch 83 are activated to prevent the heater 12 from overheating.

  The thermistor 67 is provided on the lower protective cover 13 and controls heating of the cleaning water accumulated in the reservoir 10. The temperature of the cleaning water heated by the heater 12 is detected by the thermistor 67, and the temperature information is provided to the main control circuit 65. The main control circuit 65 gives an instruction to stop energization of the heater 12 when the temperature detected by the thermistor 67 reaches 60 ° C. during cleaning, for example.

The full load switch 80 is turned on and off by the drive circuit 84. Direct current is supplied to the drive circuit 66 from the direct current power supply rectifier circuit 64, and the load is turned on and off in accordance with an instruction from the main control circuit 65.

The water supply electromagnetic valve 47 is connected to the commercial power supply 60 via a water supply electromagnetic valve switch 85 and a full load switch 80. The water supply solenoid valve switch 85 is turned on and off by the drive circuit 66.

  The water flow switching valve motor 86 is provided in the middle of the water passage between the cleaning / drainage pump 37 and the rotary nozzle body, and distributes the cleaning water to the rotary nozzle bodies 16 and 17. The water flow switching valve motor 86 is omitted. The water flow switching valve motor 86 is connected to the commercial power supply 60 via a water flow switching valve motor switch 87 and a full load switch 80. The water flow switching valve motor switch 87 is turned on and off by the drive circuit 66.

  The cleaning / drainage motor 88 drives the cleaning / drainage pump 37 described above. For example, the cleaning / drainage pump 37 functions as a cleaning pump by forward rotation of the cleaning / drainage motor 88, and functions as a drainage pump by reverse rotation.

  The washing and draining motor 88 is a condenser-run single-phase induction motor, and is connected to the commercial power source 60 via a forward rotation switch 89A, a reverse rotation switch 89, and a full load switch 80 provided in parallel. The forward switch 89 </ b> A and the reverse switch 89 are turned on / off by the drive circuit 66.

  The primary side of the fan motor transformer 100 is connected to the commercial power supply 60 via the full load switch 80. A fan motor 101 is connected to the primary side of the fan motor transformer 100 via a rectifier 102 and a fan motor switch 103. The fan motor switch 103 is turned on / off by the drive circuit 66.

  The fan motor 101 circulates hot air and cold air in the cleaning chamber 2. Due to the circulation of the warm air and the cold air, the dishes are quickly dried after washing. In the present embodiment, the air flow path is not shown in detail, but in the present embodiment, it flows from the left side surface portion of the protective covers 14 and 13, passes through the heater 12, and the exhaust port 5 provided in the upper lid 2 from the circulation hole 22. More discharged.

Further, a boiler water pump 32 is connected to the rectifier 101 via a boiler water pump switch 104. The boiler feed pump switch 104 is turned on and off by the drive circuit 66.

  The operation of the dishwasher will be described with reference to FIG.

  The operation stroke of FIG. 5 shows a standard stroke of the dishwasher.

  The general standard process is pre-washing, main washing, rinsing (1), rinsing (2), heat rinsing, drying, and finishing. In this process, pre-washing, main washing, rinsing (1), heat rinsing , Drying and finishing processes and rinsing (2) processes are reduced. Hereinafter, each step will be described in detail.

  When the power switch 62 is turned on, a standard course is selected from the display / operation unit 8 and a start switch (not shown) is turned on, the operation is started.

  Prior to the pre-washing, the washing / drainage motor 37 is operated by the washing / drainage motor 88 to perform drainage. Since the dishwasher may be stopped without draining, a drainage process is provided.

In the pre-washing process, the water supply electromagnetic valve 47 is turned on by the water supply electromagnetic valve switch 85 to be supplied to the boiler storage tank 31 through the water supply pipe 30, and the overflowed water is accumulated in the storage tank 10 and the amount of water is about 1000 ml. Water supply stops at the water level. Water supply during main wash is approximately 2700
Since it is ml, the amount of water supply is much smaller than this. This water supply amount is the minimum water supply amount that can be cleaned without the cleaning and drainage pump 37 biting air.

  When the water supply is completed, the boiler 33 and the heater 12 are turned on. At this time, the boiler is 100% energized, and the heater is turned on / off so that the current capacity of the boiler 33 is subtracted from the difference between the maximum current capacity 15A of the power cord and the current capacity of the boiler 33. Is energized.

  The water temperature of the storage tank 10 is set so that the temperature of the circulating water is 45 ° C. or higher, which is the temperature at which beef tallow dissolves. The boiler 33 is supplied from the boiler water storage tank 31 to the boiler 33 by a boiler water supply pump 32. The boiler water storage tank 31 stores a single water supply amount. When there is no water supply to the boiler 33, the temperature of the boiler 33 rises, so it is turned off from a predetermined temperature. At the same time, the boiler feed pump 32 is also turned off. In the present embodiment, the amount of water stored in the boiler storage tank 31 is 150 to 350 ml.

  The heater 33 has a heater capacity of 900 W, and the heater 9 has a capacity of 1100 W.

  When the water supply to the boiler 33 is completed, the washing / drainage pump 37 is turned on, and the washing water heated in the storage tank 10 is switched by the water flow switching device 37 to individually switch the lower rotating nozzle body 16 at two locations, and the washing water is discharged from the rotating nozzle body. The beef tallow melted by water vapor is washed away with heated washing water. The temperature inside the washing chamber 11 at this time is about 58 ° C. for 150 ml water vapor and 78 ° C. for 330 ml water vapor. The time required is about 7 minutes and 15 minutes, respectively.

  After the cleaning is completed, the water is drained, and the main cleaning process is started with little initial contamination.

  Thereby, the rinsing process performed twice can be reduced once and water can be saved.

  In the water level sensor 27, when a predetermined amount of washing water is accumulated in the reservoir 10, the contact point 27A is turned on. The main control circuit 65 reads the ON signal of the contact point 27A, gives an instruction to close the water supply electromagnetic valve 47, and the water supply electromagnetic valve 47 is closed. The contact point 27B of the water level sensor 27 is turned on to notify the main control circuit 65 when the amount of cleaning water accumulated in the reservoir 10 reaches a predetermined value which is a low water level of 1000 ml.

  After a predetermined amount of washing water has accumulated in the reservoir 10 (contact 27A is on), the heater 12 is continuously energized to promote heating of the washing water. When a predetermined amount of cleaning water accumulates in the reservoir 10, the heater 12 is sufficiently immersed in the cleaning water. Since the temperature rise of the heater 12 is suppressed and the heater 12 is not overheated, it is switched to continuous energization to accelerate heating of the washing water.

  When shifting to the washing operation, the washing and draining motor 88 is sprayed over a wide range from the upper / lower rotating nozzle bodies 17 and 16 to the washing chamber 11 to wash the dishes arranged in the dish basket.

  Prior to the cleaning by spraying the upper / lower rotating nozzle bodies 17 and 16, the pre-washing is effectively performed because the dirt has already been washed away or swollen by steam spraying and heating.

The water level in the reservoir 10 is detected by the water level sensor 27 even during the cleaning by the jetting of the upper / lower rotating nozzle bodies 17 and 16. In the operation of the washing and draining pump 37, the contact point 27A of the water level sensor 27 is turned off and no additional water supply is performed. When the washing and drainage pump 37 is stopped during washing by the jetting of the upper / lower rotating nozzle bodies 17 and 16, and the contact 27A of the water level sensor 27 does not return to the on state and the off state continues, the washing water leaks. If so, the main control circuit 65 determines, and the display operation unit 8 displays an alarm and stops the operation.

  The main washing process is performed after the pre-washing process.

  The temperature of the washing water in the main washing process is detected by the thermistor 67 even during washing. When the detected temperature reaches 60 ° C., the heater 12 is deenergized. When the detected temperature falls below 60 ° C., the heater 12 is energized and the temperature of the cleaning water is controlled to be constant.

  The main washing process may be performed by taking over the pre-washing process, that is, when the draining process is not performed or when the draining process is performed. When the drainage process is performed, the initial dirt can be discharged, and the process (2) becomes unnecessary.

  When the draining process is not performed, the heater 12 is continuously turned on to raise the temperature of the washing water to a predetermined temperature as it is, and washing is performed by main washing without supplying water. Since the emulsification of fats and oils is promoted in a state where the detergent concentration is high, washing is often performed, and the step (2) becomes unnecessary.

  After the main washing step, the rinsing (1) step is continued. In the rinse (1), the washing water is not heated.

  After the process of rinsing (1), the process proceeds to the process of heating and rinsing. The heat rinsing process is different from rinsing (1) in that it is heated and washed. Subsequent drying can be accelerated by warming by heating. The temperature of the washing water is 70-80 ° C.

  After the heating and rinsing process, the drying process is performed and the operation of the dishwasher is completed. In the drying process, the hot air is dried first. Drying is performed quickly because it is warmed by the previous heating rinse.

  In this drying process, the temperature of the heater 9 is set to an upper limit value (200 ° C. to 220 ° C.) and a lower limit value (180 ° C. to 210 ° C.). That is, when the temperature exceeds the upper limit (200 ° C. to 220 ° C.), the heater 9 is turned off, and when the temperature falls below the lower limit (180 ° C. to 210 ° C.), the heater 9 is turned on. It is carried out.

  After the warm air is dried, the air is dried without heating the heater 12. Dry the air and cool it down so that the dishes can be used immediately.

The external appearance perspective view of the dishwasher concerning one Example of this invention. Sectional drawing which looked at the dishwasher of FIG. 1 from the side. The structure for performing the washing | cleaning by water vapor | steam and heating washing water is related to the Example of this invention. The figure which concerns on the Example of this invention and shows a control circuit. The figure which concerns on the Example of this invention and shows the operation | movement flow of a dishwasher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Cleaning room, 12 ... Heater, 16 ... Lower rotation nozzle body, 17 ... Upper rotation nozzle body, 20 ... Steam spray nozzle, 31 ... Boiler water storage tank, 32 ... Boiler feed pump, 33 ... Boiler, 34 ... Steam Passage, 36 ... water flow switching device.

Claims (5)

  Tableware having a cleaning chamber for storing tableware, a rotating nozzle body for injecting cleaning water into the cleaning chamber, a heater provided on the bottom side of the cleaning chamber and for heating the cleaning water, and means for generating water vapor In the washing machine, the water is sprayed at the time of pre-washing, and then the washing water is sprayed from the rotating nozzle body to be washed less than at the time of the main washing heated by the heater.   A cleaning chamber for storing tableware, a rotating nozzle body for injecting cleaning water into the cleaning chamber, a heater provided on the bottom side of the cleaning chamber and for heating the cleaning water, and means for generating water vapor, A dishwasher equipped with an automatic detergent charging device, wherein water is sprayed at the time of pre-washing, and then less washing water is ejected from the rotating nozzle body and drained than in the main washing heated by the heater. .   3. The dishwasher according to claim 1, wherein washing water is supplied to the rotary nozzle body by a water flow switching device.   4. The dishwasher according to claim 1, wherein the means for generating water vapor is a boiler, a water tank for storing water supplied as cleaning water as water to be supplied to the boiler, and water from the water tank to the boiler. A dishwasher characterized in that the washing water overflowed from the water storage tank is retained in the washing chamber. 5. The dishwasher according to claim 1, wherein the water vapor spray nozzle is disposed at a central position of a side surface of the washing tank.

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