JP2007229189A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher capable of stably generating a large amount of steam in a simple constitution without providing a dedicated boiler for cleaning by steam. <P>SOLUTION: This dishwasher is provided with a washing chamber for storing tableware, a rotation nozzle body jetting out wash water into the washing chamber, a heater provided at the bottom of the washing chamber and heating the wash water, and a spray means atomizing water and jetting it in the washing chamber; the heater is heated synchronously with the water jetting and supply by the spray means executed in the washing operation or a rinsing operation and the heater is attached with a fin for suppressing the lowering of the temperature by the spray. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a dishwasher that wipes off dirt by spraying or steam to wash away persistent dirt.

  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 view of the above problems, an object of the present invention is to provide a dishwasher that can stably generate a large amount of water vapor with a simple configuration without providing a boiler dedicated to water vapor cleaning.

  To achieve the above object, a dishwasher according to the present invention is provided with a washing chamber for storing tableware, a rotating nozzle body for injecting washing water into the washing chamber, and a bottom side of the washing chamber, and heating the washing water. And a spray means for atomizing and spraying into the cleaning chamber, and heating the heater together with the spray water supply by the spray means performed during the cleaning operation or the rinsing operation, and the heater suppresses temperature drop due to spraying A fin is attached.

  According to the present invention, it is possible to generate a large amount of water vapor with a simple configuration without providing a dedicated boiler for cleaning with water vapor.

  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.

  A washing room 2 is provided in the outer frame 1 of the main body of the dishwasher. The washing room 2 is provided with a tableware basket 3. A rotating nozzle body 4 is provided on the upper and lower sides of the cleaning chamber 2. The rotary nozzle body 4 has a plurality of injection ports for injecting cleaning water, and cleans tableware in the tableware basket 3 with the injection cleaning water.

  A reservoir 5 for storing the cleaning water is provided at the bottom of the cleaning chamber 2. The wash water stored in the reservoir 5 is about 2.8 liters.

  The main body outer frame 1 includes an upper lid 6 and a lower lid 7 on the front surface. The cleaning chamber 2 is opened and closed by the upper lid 6 and the lower lid 7. The upper lid 6 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 7 opens and closes with the lower end side as a fulcrum. The opened lower lid 7 is placed in a substantially horizontal state.

  The upper lid 6 has a transparent window 8. The inside of the cleaning chamber 2 can be seen through the transparent window 8. The washing state of the dishwasher can be visually observed.

  The reservoir 5 is provided in front of the bottom of the cleaning chamber 2 and has a bowl shape extending in the lateral direction. As shown in FIGS. 4, 5, and 6, the bowl-shaped reservoir 5 is provided with a heater 9 made of a heating wire of a sheathed heater. A plurality of fins 200 are fixed to the heater 9 with screws 201 as shown in FIG. The fin 200 is attached to the upper side with respect to the attachment position of the heater 9, and is attached in parallel to the blowing direction during drying.

  For this reason, since heat exchange is performed in a state where the surface area of the fin 200 is large with a small blowing resistance, the heat exchange efficiency can be improved. Thereby, drying time can be shortened. Since the fin 200 has a structure in which stainless steel plates are folded and overlapped, it can be performed only by pressing, and the mounting is only fixed by the screws 201, so that the workability is low and good.

  FIG. 12 is a partially enlarged view in which the fins 200 are fixed to the heater 9. The fin 200 is made of a stainless steel plate, and the fin 200 is folded in half so that the heater 9 is sandwiched between the fins 200 and positioned at the upper side, and both ends are fixed with screws 201. When the cleaning water is heated, the lower surface is opened because the heat conduction efficiency can be increased by directly exposing the surface of the heater 9 as much as possible.

  FIG. 13 shows an embodiment in which the fixing screw 201 of the fin 200 is positioned on the upper surface side of the heater 9 in order to increase the degree of exposure of the lower surface. Since each fin 200 has a structure in which the upper surface portion is bent, when the water surface is gradually lowered when the water is washed and drained, the upper surface portion is circular and gentle, so that the adhesion of oil and fat is reduced.

  Below the heater 9 is provided a lower protective cover 20 having a bowl shape that protects the reservoir 5 made of synthetic resin from heat. An upper protective cover 21 is provided on the heater 9 so as to cover the heater 9 from above. The upper protective cover 21 is provided with a number of flow holes 22 having a diameter of several millimeters. The upper / lower protective covers 20, 21 are formed of a stainless steel plate. Since there are many circulation holes 22, the circulation holes 22 exist just above the heater 9 as shown in FIG. 6.

  The lead-out terminal 30 of the heater 9 is provided on the left end side (illustrated in FIG. 3) of the reservoir 5. An outlet 23 is provided at the bottom of the reservoir 5 that is opposite to the lead terminal 30. The outlet 23 is connected to communicate with the cleaning circulation pump 24 and the drainage pump 25.

  The discharge side of the cleaning circulation pump 24 is communicated with the rotary nozzle body 4 via a water channel 26 for cleaning water. By the operation of the cleaning circulation pump 24, the cleaning water is injected from the injection port of the rotary nozzle body 4, and the rotary nozzle body 4 is rotated by the reaction, so that the cleaning water is injected over a wide range.

  The discharge side of the drain pump 25 communicates with a drain port (not shown). By the operation of the drainage pump 25, it is possible to drain all of the cleaning water collected in the storage unit 5.

The water level sensor 27 detects the water level accumulated in the reservoir 5. A communication pipe 28 communicating with the reservoir 5 is provided, and a water level sensor 27 is attached to the tip of the communication pipe 28. The water level sensor 27 detects the water level of the reservoir 5 and controls the operation of the dishwasher.

The spray means 29 is provided on the side surface of the cleaning chamber 2 as shown in FIG. The spraying means 29 may be provided on the back side surface of the cleaning chamber 2. The spray means 29 has a plurality of spray nozzle portions 40 arranged side by side. You may arrange | position the injection nozzle part 40 vertically.

  As shown in FIGS. 7 and 8, the injection nozzle section 40 has a circular piece storage chamber 41 inside and a spray port 42 on the front side, and the piece storage chamber 41 and the spray port 42 communicate with each other. The atomizing piece 43 stored in the piece storage chamber 41 has a spiral groove 44 on the outer periphery. The spray means 29 is provided so that the spray port 42 faces the cleaning chamber 2.

As shown in FIG. 3, the spraying means 29 is connected to communicate with a water supply electromagnetic valve 47 of the water pipe 46 through a spray water supply path 45. A pressure reducing valve 48 is provided in the spray water supply channel 45.

  As shown in FIG. 9, the pressure reducing valve 48 includes a pressure relief port 49, a valve body 50 provided so as to close the pressure relief port 49, and a spring 51 that biases the valve body 50 to press the pressure relief port 49. And an outlet channel 52 communicating with the downstream side of the pressure outlet 49. The pressure reducing valve 48 is provided so that the escape channel 52 faces the cleaning chamber 2.

  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 device 69 performs display related to the operation of the dishwasher according to an instruction 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 9 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 9 is connected to the commercial power supply 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 20 in the vicinity of the heater 9. When the heater 9 is overheated exceeding 300 ° C., the thermo switch 81, the temperature fuse 82, and the thermo switch 83 are activated to prevent the heater 9 from overheating.

  The thermistor 67 is provided in the lower protective cover 20 and controls the heating of the cleaning water accumulated in the reservoir 5. The temperature of the cleaning water heated by the heater 9 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 9 when the temperature detected by the thermistor 67 reaches, for example, 60 ° C.

The full load switch 80 is turned on and off by the drive circuit 66. 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 switching valve motor 86 is provided in the middle of the water channel 26 and distributes the cleaning water to the rotary nozzle bodies 4 provided above and below the cleaning chamber 2. In the drawing showing the water channel 26, the switching valve motor 86 is omitted. The switching valve motor 86 is connected to the commercial power source 60 via a switching valve motor switch 87 and a full load switch 80. The switching valve motor switch 87 is turned on and off by the drive circuit 66.

  The cleaning / drainage motor 88 drives the cleaning circulation pump 24 and the drainage pump 25 described above. For example, the cleaning circulation pump 24 functions as a pump when the cleaning and draining motor 88 rotates forward, and the drainage pump 25 functions as a pump when rotating backward.

  The washing and draining motor 88 is a condenser-run single-phase induction motor, and is connected to the commercial power supply 60 via a forward rotation switch 89A, a reverse rotation switch 89B, and a full load switch 80 provided in parallel. The forward switch 89 </ b> A and the reverse switch 89 </ b> B 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 the figure, but in the present embodiment, the air flows from the left side surface of the protective covers 20 and 21, passes through the heater 9, and is disposed in front of the upper part of the main body outer frame 1 from the circulation hole 22. Further, the gas is discharged from an exhaust port 210 provided in the upper lid 6.

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

  The operation stroke of FIG. 11 shows a standard stroke of a dishwasher.

The standard process goes from pre-washing, main-washing, rinsing (1), rinsing (2), heat rinsing, drying and finishing.

Now, the operation is started by turning on the power switch 62, selecting the standard course from the display device 69 and turning on the start switch (not shown).

Prior to the pre-washing, the drainage pump 25 is operated by the washing and draining motor 88 to execute drainage. Since the dishwasher may be stopped without draining, a drainage process is provided.

  When entering the pre-washing process, the heater 9 is first energized and heated. Since the heat capacity of the heater 9 is increased by adding the fins 200, the heating time increases if the heat generation amount is the same and the temperature is the same.

  Therefore, since the spraying time can be extended by increasing the heat storage amount of the heater 9 by heating the heater 9 first, the amount of steam generated can be increased.

  Further, since tap water is used at the time of spraying, there is a large variation in the amount of spray at the time of spraying, but the temperature drop due to this can be reduced and stabilized to generate steam.

  After the elapse of time when the temperature of the heater 9 reaches a predetermined temperature, the water supply electromagnetic valve 47 is opened by energization of the water supply electromagnetic valve 47 and mist shower (spraying) is performed from the spray nozzle portion 40 of the spraying means 29.

  In this spray water supply, the temperature of the heater 9 is set to an upper limit (250 ° C. to 300 ° C.) and a lower limit (180 ° C. to 260 ° C.). That is, when the temperature exceeds the upper limit value (250 ° C. to 300 ° C.), the heater 9 is turned off, and when the temperature falls below the lower limit value (210 ° C. to 260 ° C.), the heater 9 is turned on. Control is in progress.

  In order to shorten the time, the heater 9 can be continuously turned on and the spraying time can be turned on and off so that the heater temperature does not exceed the upper limit value. In this case, if the temperature of the heater surface is not controlled indirectly, if the spraying fails, the resin-molded storage portion 5 is damaged by heat, so the thermo switch 81 is provided on the side surface that is not affected by the washing water. That's fine.

  The spray particles sprayed from the spray port 42 of the spray nozzle section 40 are fine particles of the order of micro mist, and adhere to dirt on tableware and tableware. Further, the spray of fine particles passes through the flow hole 22 of the upper protective cover 21 and comes into contact with the heater 9 and vaporizes into water vapor. Microparticles on the order of micro mist often generate water vapor because they are fine.

  Vaporized water vapor passes through the circulation hole 22 and rises and mixes with the spray of fine particles, and adheres to the dirt on the tableware and tableware. Due to the spray of fine particles and the adhesion of water vapor, the dirt is wrapped in high temperature and high humidity, and it flows down naturally. Moreover, it becomes easy to fall.

  The spray water supply by the spraying and the heating by the heater 9 are continued until a predetermined amount of washing water is accumulated in the reservoir 5. The amount of washing water stored in the reservoir is usually about 2.8 liters. It takes about 1 minute. By slowly supplying water over several minutes, the time for wrapping in high temperature and high humidity is lengthened, thereby promoting the removal of dirt.

  The delay of the water supply time is realized by making the spray water supply intermittent. There are ways to reduce the pressure of tap water applied to the spray nozzle section 40 or to throttle the spray port 42 of the spray nozzle section 40, but intermittent spray water supply can be easily handled by opening and closing the water supply electromagnetic valve 47. realizable.

  The heater 9 is inherently present to wash the wash water stored in the reservoir 5 to about 60 ° C. before washing and to warm the circulating air during hot air drying. By using this heater 9 for heating at the time of spray water supply, it is possible to generate water vapor, and it is not necessary to provide a dedicated water vapor generator as in the conventional example. The space will not narrow.

  During spray water supply, the heater 9 is energized intermittently. Since the heater 9 is deprived of only the heat of vaporization of the spray during spray water supply, it directly exceeds the overheating temperature. When the overheat temperature is exceeded, the thermo switch 81, the thermal fuse 82, and the thermo switch 83 are activated and heating is disabled. By intermittently energizing the heater 9, the operation of the thermo switch 81, the temperature fuse 82, and the thermo switch 83 can be suppressed, and heating during spray water supply can be reliably performed.

  In the water level sensor 27, when a predetermined amount of cleaning water is accumulated in the reservoir 5, 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 27 </ b> A 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 5 reaches an overflow.

  After a predetermined amount of cleaning water has accumulated in the reservoir 5 (contact 27A is on), the heater 9 is continuously energized to promote heating of the cleaning water. When a predetermined amount of cleaning water accumulates in the reservoir 5, the heater 9 is sufficiently immersed in the cleaning water. Since the temperature rise of the heater 9 is suppressed and the heater 9 is not overheated, it is switched to continuous energization to accelerate heating of the washing water.

  When the operation moves to the washing operation, the washing / circulation pump 24 is operated by the washing and draining motor 88. The warmed cleaning water in the reservoir 5 is sprayed over a wide range from the rotary nozzle body 4 to the cleaning chamber 2 through the cleaning circulation pump 24 and the cleaning water channel 26 to clean the dishes in the table basket 3.

  Prior to the cleaning by the jetting of the rotating nozzle body 4, the pre-washing is effectively performed because the dirt has already been washed away by the spray water supply and heating.

  In addition, it is desirable to use the detergent after spraying water and heating are finished.

The water level in the reservoir 5 is detected by the water level sensor 27 even during cleaning by spraying the rotating nozzle body 4. During the operation of the cleaning circulation pump 24, the contact point 27A of the water level sensor 27 is turned off and no additional water supply is performed. If the washing circulation pump 24 is stopped during washing by the jetting of the rotary nozzle body 4 and the contact 27A of the water level sensor 27 does not return to the on state and the off state continues, the main control is performed if the washing water leaks. The circuit 65 makes the determination, and the display device 69 displays an alarm and stops the operation.

  The temperature of the cleaning water is detected by the thermo switches 81 and 83 even during the cleaning by the jetting of the rotating nozzle body 4. When the detected temperature reaches 60 ° C., the heater 9 is de-energized.

  When a predetermined time for washing by the injection of the rotating nozzle body 4 has elapsed, the operation of the cleaning circulation pump 24 is stopped, and the drainage pump 25 is operated to drain the cleaning water after cleaning. When a predetermined drainage time has elapsed, the drainage pump 25 is stopped. Thus, the prewash process is completed.

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

  The main washing process is not different in content from the pre-washing process. In the main washing process, washing is done exclusively (heated washing), but in the prewashing process (heated washing) and at room temperature (washing) without heating can be arbitrarily selected.

  After the main washing process, the processes of rinsing (1) and rinsing (2) are continuously performed. Rinse (1) and rinse (2) have the same contents. By rinsing twice, the dishes can be better rinsed.

  Rinse (1) and (2) differ from the main washing process in that spray water is supplied without spraying water and heating, and heat washing is not performed. In rinsing (1) and (2), spray water supply without heating is performed before washing.

  With this spray water supply, fine stains reattached to the rinse (1) are washed away during the main washing. That is, the spray of the fine particles sprayed from the spray nozzle unit 40 is extremely fine and sprayed uniformly in the cleaning chamber. For this reason, the spray of the fine particles adheres to the inner surface of the tableware basket and the washing room as well as the tableware, and the finely adhered fine dirt flows away.

  Here, the reason why the spray water supply without heating is performed is that the fine dirt that has reattached flows down sufficiently without being soft.

  Thus, since the fine dirt which adhered again beforehand is poured before rinsing by injection of rotating nozzle body 4, rinsing is performed more effectively.

  After the process of rinsing (2), the process moves to the process of heating and rinsing.

  The heating and rinsing process is different from rinsing (1) and (2) in that it is heated and washed. Subsequent drying can be accelerated by warming by heating.

  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 9. Dry the air and cool it down so that the dishes can be used immediately.

  Finally, the end can be known by a buzzer notification.

  Hereinafter, the effect by providing the fin 200 in the heater 9 is demonstrated.

  The air blown during drying is poor in heat dissipation efficiency if the surface area is small to obtain heat from the heater 9, but the fins 200 are provided in parallel to the heater 9, so that the heat dissipation efficiency is improved, and if it is the same time The drying performance is improved and the time can be shortened with the same drying rate. Further, fixing the fins to the heater 9 can also prevent the rampage due to thermal deformation.

  Further, by adding the fins 200 to the heater 9, the heat capacity is increased, the heat storage effect is increased, and the energization time can be extended at the same temperature, so that the heat storage amount can be increased and the spray amount varies. Steam can be generated stably.

  By adding the fins 200 to the heater 9, it is possible to obtain a dishwasher in which both the heat dissipation efficiency when heating the washing water and when drying by blowing is improved.

The external appearance perspective view of the dishwasher concerning the Example of this invention. Sectional drawing which concerns on the Example of this invention and looked at the dishwasher from the side. Sectional drawing which concerns on the Example of this invention and looked at the dishwasher from the front. The perspective view which concerns on the Example of this invention and shows the related structure of a heater. The perspective view which concerns on the Example of this invention and shows the related structure of a heater. The top view which concerns on the Example of this invention and looked at the relevant structure of the heater from the top. The sectional view of the spraying means according to the embodiment of the present invention. The figure which concerns on the Example of this invention, and shows the atomization piece of the spraying means. The sectional view of a spray water supply channel and a pressure reducing valve according to the embodiment of the present 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. The partial expansion perspective view which concerns on the Example of this invention and shows the related structure of a heater. The partial expansion perspective view which concerns on the Example of this invention and shows the related structure of a heater.

Explanation of symbols

2 ... cleaning chamber, 4 ... rotating nozzle body, 9 ... heater, 29 ... spraying means.

Claims (4)

  A cleaning chamber for storing tableware, a rotating nozzle body for injecting cleaning water into the cleaning chamber, a heater for heating the cleaning water provided on the bottom side of the cleaning chamber, and a spray for injecting spray into the cleaning chamber A dishwasher having means and means for heating the spray with the heater to generate water vapor, wherein a fin located in the vertical direction in the longitudinal direction of the heater is provided.   2. The dishwasher according to claim 1, wherein the fins provided on the heater are arranged substantially parallel to the blowing direction during drying.   3. The dishwasher according to claim 1, wherein the heater is formed of a heating wire including a sheathed heater, a protective cover for covering the heater from above is provided, and the fin provided on the heater has a fin fixing portion. A dishwasher characterized in that the bottom surface is exposed except. 4. The dishwasher according to claim 1, wherein the spray is sprayed after heating the heater.

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