JP2008183214A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher capable of preventing the thermal damage of a water accumulation part due to heat generation of a boiling heater and improving the responsiveness of abnormal temperature detection compatibly even when energizing by malfunction or the like occurs. <P>SOLUTION: The dishwasher includes: a washing tub 3 for storing dishes; a washing pump 13 for pressurizing washing water; a nozzle 14 for jetting the washing water; a water accumulation part 3d formed at the lower part of the washing tub 3; a boiling heater 12 for heating the washing water; a heat shielding plate 8 arranged between the water accumulation part 3d and the boiling heater 12 so as to cover at least a part of an inner bottom surface and an inner side face inside the water accumulation part 3d; an over-temperature-rise switch 15 for detecting a temperature transmitted from the boiling heater 12 and interrupting the energizing of the boiling heater; and a recessed part provided on the outer side wall surface of the water accumulation part 3d and having a thin bottom part, on which the over-temperature-rise switch 15 is mounted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dishwasher capable of detecting an abnormality in a water heater with a simple configuration.

In the washing and rinsing process of a conventional dishwasher, the washing water stored in the washing tank installed in the main body is heated by a water heater, pressure is given by a washing pump, and the tableware is given by a nozzle. It sprays on the tableware stored in the basket.
Moreover, the drying process of the conventional dishwasher is to send the air pressurized by the blower into the washing tank, and discharge the hot and humid air inside it from the exhaust port to the outside of the equipment. The water heater is also intermittently heated.

  The hot water heater is energized when the cleaning water or dry air is heated, but the temperature rises abnormally when energized when the water reservoir is empty due to malfunction or the like. It is prepared to suppress the temperature rise. (For example, see Patent Document 1)

Japanese Patent Laid-Open No. 5-137687 (paragraphs 0011 to 0016, FIG. 1)

  In the conventional dishwasher described in Patent Document 1, even if energization occurs due to malfunction when the water heater is immersed in the cleaning water by about half (only the upper surface side of the water heater is not immersed in the cleaning water), The temperature at the bottom of the water reservoir does not rise abnormally. That is, there is a problem in temperature responsiveness to the temperature rise prevention device. For this reason, when the temperature rise prevention means provided at the bottom of the water reservoir does not operate or does not operate due to malfunction, the upper portion of the water reservoir on the upper side of the water heater is abnormally high due to the heat generated in the upper half of the electric heater. There was a problem that the temperature became high and the water reservoir made of synthetic resin was damaged.

  The present invention has been made in order to solve the above-described problems, and is capable of both preventing thermal damage of the water reservoir due to heat generated by the water heater and improving the detection response of abnormal temperature even when energization due to malfunction occurs. It aims at obtaining the dishwasher made to let it be.

  The dishwasher according to the present invention includes a washing tank for storing dishes, a washing pump for pressurizing washing water, a nozzle for injecting washing water, a water reservoir formed below the washing tank, and the water reservoir. A water heater that heats the cleaning water provided in the unit, and a heat shield plate disposed between the water reservoir and the water heater so as to cover at least a part of the inner bottom surface and the inner surface of the water reservoir, A temperature rise switch that cuts off the energization of the water heater based on the temperature transmitted from the water heater, a recess provided on the outer wall surface of the water reservoir, the bottom being thin, and the temperature rise switch being mounted; It is equipped with.

  According to the dishwasher of the present invention, the heat transfer plate disposed between the water reservoir and the water heater and the temperature transmitted from the water heater is detected so as to cover at least a part of the inner bottom surface and the inner surface of the water reservoir. The heater has a temperature rise switch that shuts off the heater and cuts off the power to the heater, and a recess that is provided on the outer wall surface of the water reservoir and has a thin bottom and is fitted with the temperature rise switch. Even if this energization occurs, it is possible to prevent thermal damage of the water reservoir, and to maintain good detection response to abnormal temperatures.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a dishwasher according to the present invention, FIG. 2 is a transverse sectional view of an essential part of a water reservoir of Embodiment 1, and FIG. 3 is a detailed sectional view taken along line AA of FIG.

  As shown in FIGS. 1, 2, and 3, the dishwasher 1 includes an outer casing 2, an inner casing 2, and a washing tub 3 that is a container for cleaning and drying the dishes 91, A lid 4 for closing the opening of the cleaning tank 3 is provided above the cleaning tank 3, and a door 5 is attached to the front of the cleaning tank 3 and is a design part and also has an operation part.

  Further, a tank air outlet 3a for supplying warm air necessary for drying the dishes 91 is formed behind the cleaning tank 3, and on the outside thereof, drying for sending air into the cleaning tank. The unit 21 is attached, and the drying unit 21 includes a drying blower 22 for supplying air, and a casing 24 that rectifies the air by incorporating this.

  In addition, a tank exhaust port 3b for discharging high-temperature wet air generated in the cleaning tank 3 is provided in front of the cleaning tank 3, and the high-temperature wet air is discharged outside the device above the door 5. An exhaust port 5a is formed, and an exhaust unit 41 for connecting them is attached between them.

  A water reservoir 3 d is formed below the cleaning tank 3 so as to be recessed downward in the cleaning tank 3. The water reservoir 3d is lower than where the nozzles 14 are provided, and is arranged so that the cleaning water collects and accumulates. The washing tank 3 and the water reservoir 3d are formed of synthetic resin.

  A heat shield 8 made of a stainless steel plate is fitted into the water reservoir 3d. The heat shield plate 8 is placed on the inner bottom surface of the water reservoir 3d at the bottom and on the inner side surface of the water reservoir 3d at the upward side extending upward. The heat shield plate 8 is open at both ends in the longitudinal direction, and the water heater 12 is placed in the heat shield plate 8. The water heater 12 is formed of a sheathed heater and is folded to have a U shape.

In addition, when the water heater 12 is in an empty cooking state for some reason, and the water reservoir 3d is at an abnormally high temperature, the overheat switch 15 for turning off the water heater 12 and shutting off the heater 12 separately from the control device 9 A lid 7 is attached to the recess 3e on the back surface side of the water reservoir 3d on the outer bottom surface side of the hot plate 8.
The bottom of the recess 3e is formed thinner than the other part of the water reservoir 3d to increase the temperature responsiveness, and the water reservoir can detect an appropriate temperature even if there is residual water when the drainage pump is not sufficiently drained. It is raised from the bottom of the part 3d. Further, by interposing silicone or the like on the temperature detection surface 15a of the overheating switch 15, there is no gap in the joint with the recess 3e, so that the thermal conductivity is improved.

Next, the operation in the case of cleaning and drying dishes with the dishwasher according to the present invention will be described.
First, tableware 91 to be washed and dried is stored in the tableware basket 6, an appropriate amount of detergent is put in the vicinity thereof, and the door 5 is closed. Although not shown in the figure, an operation switch (not shown) provided in the operation unit formed on the door 5 is pressed to start the operation of the device.
The operation is controlled by the control device 9, and each functional component is operated in accordance with the command, and the cleaning process, a plurality of rinsing processes, and a drying process are performed in this order.

When the above-described cleaning process is started, in the water supply operation described above, first, the water supply valve 10 is opened to supply water into the cleaning tank 3.
At this time, the water level in the cleaning tank 3 is monitored by the water level detection device 11, and when it is detected that the water level has reached a predetermined level, the water supply valve 10 is closed. Next, the hot water heater 12 is energized to heat the stored wash water to a predetermined temperature, and the wash pump 13 is energized to apply pressure to the wash water and spray from the nozzle 14 onto the dishes 91.
The cleaning is performed while circulating the stored cleaning water. The cleaning water that has fallen to the bottom of the cleaning tank 3 is collected, pressure is applied again by the cleaning pump 13, and the nozzle 14 sprays the dishes 91. Repeat.

  When the cleaning process is started and a predetermined time elapses, energization of the water heater 12 and the cleaning pump 13 is stopped and the drainage pump 17 is energized to drain the cleaning water stored in the cleaning tank 3 to the outside. Thereby, the cleaning process is completed.

Next, the rinsing process is started, but the basic operation is almost the same as the cleaning process. First, the water supply valve 10 is opened, water is supplied into the cleaning tank 3, and a predetermined water level is detected by the water level detection device 11. Is reached and the water supply valve 10 is closed. Next, the washing pump 13 is energized, pressure is applied to the rinse water, and the nozzle 14 sprays the dishes 91.
When a predetermined time has elapsed, the energization of the cleaning pump 13 is stopped and the drainage pump 17 is energized to drain the rinse water stored in the cleaning tank 3 to the outside.
Such a rinsing process is repeated a plurality of times.

When the washing and rinsing steps as described above are completed, the final drying step is started.
First, the drying blower 22 is energized, pressure is applied to the air, and the spray is sprayed onto the dishes 91 from the tank blower port 3a. At that time, the water heater 12 is energized in a timely manner, and the air is heated to change to hot air.
And it is sent from the air tank ventilation port 3a taken in from the air intake 3c, passes through the inside of the cleaning tank 3, enters the exhaust unit 41 from the tank exhaust port 3b, and is discharged out of the equipment from the exhaust port 5a. become.

  In the normal operation described above, the control device 9 appropriately controls the heater 12 by the temperature detection means (not shown), and the operation of the overheat switch 15 does not occur because the temperature does not reach an abnormally high temperature.

  Now, under the condition that there is no washing water in the water reservoir 3d or a small amount of residual water remains at the bottom, for example, when the controller 9 malfunctions, the water heater is heated and the heater 12 is energized continuously. The water heater 12 continues to rise in temperature, and the overheat switch 15 detects the abnormal temperature transmitted from the heater 12 and hot water is turned off to cut off the energization of the heater 12.

  At this time, as shown in the figure, the overheat switch 15 is arranged on a substantially vertical extension line of the central axis of the water heater 12, and in addition, the heat shield 8 faces the temperature detection surface 15 a of the overheat switch 15. An opening 8a is provided at a position to speed up the temperature responsiveness of the overheat switch 15.

  As described above, the temperature transmitted from the water heater 3 and the heat shield plate 8 disposed between the water reservoir 3d and the water heater 12 so as to cover at least a part of the inner bottom surface and the inner side surface in the water reservoir 3d. Malfunction due to the provision of an overheat switch 15 that detects and shuts off the energization of the heater by heating, and a recess that is provided on the outer wall surface of the water reservoir 3d and that has a thin bottom and is fitted with the overheat switch 15 Even when the heater is energized, the temperature detection responsiveness can be kept good. The heater 12 can be quickly heated and the heater 12 can be de-energized. During this time, the heat shield plate 8 can cover the heater 12 from around. In addition, it is possible to protect the water reservoir 3d formed of the synthetic resin from the radiant heat by blocking the radiant heat emitted by the water heater 12.

  Further, since the recess 3e of the water reservoir 3d is provided on the outer bottom wall surface of the water reservoir 3d and the bottom of the recess 3e is raised on the inner bottom wall surface of the water reservoir 3d, there is residual water when the drainage pump cannot sufficiently drain the water. Can also detect the appropriate temperature.

  Further, since the opening 8a is provided at a position facing the temperature detection surface 15a of the overheat switch 15 of the heat shield plate 8, the temperature detection response can be kept better.

  Further, since the overheat switch 15 is arranged on the substantially vertical extension line of the central axis of the water heater 12 on the outer bottom surface side of the water reservoir 3d, the temperature detection response can be kept better.

Embodiment 2. FIG.
4 is a cross-sectional view of the main part of the water reservoir according to the second embodiment, and FIG. 5 is a detailed cross-sectional view taken along the line AA of FIG.
In the first embodiment, the overheat switch 15 is heated and disposed on a substantially vertical extension line of the central axis of the heater 12, but in the second embodiment, the overheat switch 15 is provided for each of the U-shaped water heaters 12. It is arranged on a substantially central vertical extension line between the central axes. Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

  As shown in FIGS. 4 and 5, the overheat switch 15 provided in the recess 3 e on the back surface side of the water reservoir 3 d is on a substantially central vertical extension line between the central axes of the U-shaped water heaters 12. In addition, the heat shield 8 is provided with an opening 8a at a position (part) facing the temperature detection surface 15a of the overheat switch 15.

  As described above, the water heater 12 has a U-shape, and the overtemperature switch 15 is disposed on the vertical extension line at the approximate center of the straight portion of the U-shaped water heater 12 on the outer bottom surface side of the water reservoir 3d. The temperature responsiveness of the overheating switch 15 can be accelerated, and the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
FIG. 6 is a cross-sectional view of the main part of the water reservoir of the third embodiment, and FIG. 7 is a detailed cross-sectional view taken along the line AA of FIG.
In the first and second embodiments, the overheat switch 15 for turning off the water heater 12 is provided in the concave portion 3e on the back surface side of the water reservoir 3d, and the concave portion 3e is raised from the bottom surface. Is an arrangement in which the overheat switch 15 is disposed in a recess 3e formed on the outer wall surface of the water reservoir 3d. Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

  As shown in FIGS. 6 and 7, the overheat switch 15 disposed in the recess 3 e formed on the outer wall surface of the water reservoir 3 d is disposed so as to be on a substantially horizontal extension line of the central axis of the water heater 12. ing. And if it is a side surface, since it is away from the bottom surface, even if there is residual water when it is not sufficiently drained by the drain pump, an appropriate temperature can be detected, and the recess 3e does not rise from the side surface, and the recess 3e The temperature responsiveness is enhanced by forming a thin part formed thinner than the other part of 3d. Further, the heat shield plate 8 is provided with an opening 8a at a position facing the temperature detection surface 15a of the side surface overheating switch 16.

  As described above, since the overheat switch 15 is disposed on the substantially horizontal extension line of the central axis of the water heater 12 on the outer wall surface side of the water reservoir 3d, the temperature responsiveness of the overheat switch 16 can be accelerated, The same effect as in the first embodiment can be obtained.

Embodiment 4 FIG.
FIG. 8 is a cross-sectional view of the main part of the water reservoir of the fourth embodiment, and FIG. 9 is a detailed cross-sectional view in FIG.
In the first to third embodiments, the overheat switch 15 is attached to the water reservoir 3d and the bottom portion is provided with the thin recessed portion 3e. However, in the fourth embodiment, the bottom portion of the recessed portion 3e is passed through the through hole portion. Instead of 3f, the heat shield plate 8 is attached so as to prevent water leakage from the through hole portion 3f, and the overheat switch 15 is attached to the through hole 3f so as to contact the heat shield plate 8. Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

  As shown in FIGS. 8 and 9, in FIGS. 6 and 7 of the third embodiment, the bottom portion of the recess 3e is penetrated to replace the recess 3e with the through hole portion 3f, and the heat shield plate 8 includes the through hole portion 3f. The overheat switch 15 is attached to the through hole 3f, and the temperature detection surface 15a is attached in close contact with the outer surface of the heat shield plate 8. In addition, the opening 8a is not provided in the heat shield 8.

  As a method of attaching the heat shield plate 8 to the inside of the water reservoir 3d of the cleaning tank 3 in a state where water leakage can be prevented at the mounting surface, there is a method of simply attaching the heat shield plate 8 to the inside of the water reservoir 3d with an adhesive. . This method can be easily manufactured.

  Further, when the cleaning tank 3 is resin-molded, the heat shield plate 8 can be integrally molded. According to this method, although it is necessary to devise at the stage of forming the cleaning tank 3, it is possible to simplify the work during product assembly.

  Further, in the method of integrally forming the heat shield plate 8 when the washing tank 3 is resin-molded, the surface of the heat shield plate 8 is improved by adhesion or the like in order to improve the adhesion between the heat shield plate 8 and the washing tank 3. After the treatment, it is possible to further improve the waterproofing prevention effect by integrally molding.

  As described above, the bottom of the recess 3e is penetrated and the recess 3e of the water reservoir 3d is replaced with the through-hole 3f, and the heat shield plate 8 is attached so as to prevent water leakage from the through-hole 3f. Since the switch 15 is attached to the through hole 3f so as to be in contact with the heat shield plate 8, the heat shield plate 8 is made of metal, and its thermal conductivity is significantly higher than that of the resin forming the water reservoir 3d. Therefore, by configuring in this way, the temperature responsiveness detection performance can be further accelerated, and the same effects as in the first to third embodiments can be obtained.

In the fourth embodiment, the mounting position is the same as that of the third embodiment. However, the mounting position is not limited to the mounting position of the overheat switch 15 and is the mounting position of the first and second embodiments. Needless to say, this is applicable.
In the case of Embodiments 1 and 2, in FIGS. 3 and 5, the bottom of the recess 3e raised on the inner bottom wall surface of the water reservoir 3d is removed, and the recess 3e of the water reservoir is replaced with the through hole 3f. The other structures can be made the same as the above structure to accelerate the temperature responsiveness detection performance.

  Further, as shown in FIG. 10, a cap-like heat shield cap 25 is provided in the water reservoir 3d so that a convex portion is located in the opening 8a of the shield plate 8 and can be prevented from leaking water. The switch 15 may be inserted into the heat shield cap 25 so that the temperature detection surface 15 a is in close contact with the inner surface of the convex portion of the heat shield cap 25.

Embodiment 5. FIG.
FIG. 11 is a longitudinal sectional view of the dishwasher according to the fifth embodiment.
In the first to fourth embodiments, the drying process is performed by the water heater 12, but in the fifth embodiment, the drying heater 23 for the drying process is provided separately. Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted. The form of the water reservoir 3d may be any of the first to fourth embodiments.

  In the first to fourth embodiments, there is no washing water in the water reservoir 3d, or abnormal operation of continuous energization to the water heater 12 in a state where a little residual water remains at the bottom, that is, in the drying process. Although an abnormal operation is assumed, in the above-described configuration, the heater 23 for drying is provided, and the water heater 12 is not energized at the time of drying, so that the abnormal operation of the water heater 12 in the drying process hardly occurs. In the abnormal operation during the cleaning process and the rinsing process, it is assumed that water is accumulated in the cleaning tank 3, but it is difficult to empty the water.

  Further, since the water heater 12 is not energized at all during the drying process, the temperature of the water reservoir 3d is normally the highest during the drying process, and it is necessary to set the detection temperature of the overheat switch 15 in consideration of this. However, since it is not necessary to consider this, the detection temperature of the overheating switch 15 can be further lowered, and the effects of the first to fourth embodiments can be further improved.

It is a longitudinal cross-sectional view of the dishwasher which concerns on Embodiment 1 of this invention. It is a water reservoir principal part cross-sectional view of the tableware washing machine which concerns on Embodiment 1 of this invention. It is AA detailed sectional drawing of FIG. It is a water reservoir principal part cross-sectional view of the tableware washing machine which concerns on Embodiment 2 of this invention. It is AA detailed sectional drawing of FIG. It is a water reservoir principal part cross-sectional view of the tableware washing machine which concerns on Embodiment 3 of this invention. It is AA detailed sectional drawing of FIG. It is a water reservoir principal part cross-sectional view of the tableware washing machine which concerns on Embodiment 4 of this invention. It is AA detailed sectional drawing of FIG. It is a water reservoir principal part cross-sectional view of the tableware washing machine which concerns on Embodiment 4 of this invention. It is a longitudinal cross-sectional view of the tableware washing machine which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Dishwasher, 3 Washing tank, 3d Water reservoir, 3e Recessed part, 3f Through-hole, 8 Heat shield, 12 Water heater, 13 Washing pump, 14 Nozzle, 15 Overtemperature switch, 15a Temperature detection surface.

Claims (9)

A washing tank for storing tableware,
A cleaning pump for pressurizing the cleaning water;
A nozzle for injecting the pressurized washing water;
A water reservoir formed below the washing tank;
A water heater for heating cleaning water provided in the water reservoir,
A heat shield plate disposed between the water reservoir and the water heater so as to cover at least a part of the inner bottom surface and the inner side surface in the water reservoir,
An overtemperature switch for shutting off energization of the water heater based on the temperature transmitted from the water heater;
A recess provided on the outer wall surface of the water reservoir, the bottom is thin, and the overheat switch is mounted;
A dishwasher characterized by comprising:   2. The dishwasher according to claim 1, wherein a concave portion of the water reservoir is provided on an outer bottom wall surface of the water reservoir, and a bottom of the concave portion is raised on an inner bottom wall surface of the water reservoir.   The dishwasher according to claim 1 or 2, wherein an opening is provided at a position facing the temperature detection surface of the overheat switch of the heat shield plate. Through the bottom of the recess and replace the recess of the water reservoir with a through-hole,
The heat shield plate is attached so as to prevent water leakage from the through hole portion,
2. The dishwasher according to claim 1, wherein the overheat switch is mounted in the through hole so as to contact the heat shield plate. Removing the bottom of the recess raised on the inner bottom wall surface of the water reservoir, replacing the recess of the water reservoir with a through-hole,
The heat shield plate is attached so as to prevent water leakage from the through hole portion into the water reservoir portion,
3. The dishwasher according to claim 2, wherein the overheat switch is mounted in the through hole so as to contact the heat shield plate.   The dishwasher according to any one of claims 1 to 5, wherein the overtemperature switch is disposed on a substantially vertical extension line of a central axis of the water heater on the outer bottom wall surface of the washing tank water reservoir. The water heater has a U shape,
6. The over-temperature switch is arranged on a vertical extension line substantially at the center of a straight portion of the U-shaped water heater on the outer bottom wall surface of the water reservoir. Dishwasher.   The dishwasher according to any one of claims 1 to 5, wherein the overtemperature switch is disposed on a substantially horizontal extension line of a central axis of the water heater on an outer bottom wall surface of the water reservoir. Equipped with a heater for drying,
The dishwasher according to any one of claims 1 to 8, wherein the water heater is not energized during drying.

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