JP3601137B2 - Dishwasher - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dishwasher that performs washing by spraying washing water.
[0002]
[Prior art]
Hereinafter, a conventional dishwasher will be described with reference to FIG. The tableware is stored in a tableware basket 52 of a washing tank 51, and a detergent is added to start the operation. When the operation is started, first, a water supply step of supplying a predetermined amount of cleaning water to the cleaning tank 51 is executed. Subsequently, a main washing step is performed in which the washing water pressurized by the washing pump 53 and heated by the heater 54 is jetted from the washing nozzle 55 together with the detergent. The cleaning water is injected vertically or obliquely upward from the injection ports 56a to 56f of the cleaning nozzle 55. Further, the cleaning nozzle 55 is rotated substantially horizontally by the injection reaction force.
[0003]
Therefore, most of the washing water is jetted at an angle in a direction opposite to the rotation direction of the washing nozzle 55, and collides with the tableware. The dishes are washed by the action of the collision force of the washing water, detergent, heat and the like.
[0004]
After the main washing process for a predetermined time, the process enters a draining process in which washing water containing dirt washed off from tableware or the like is discharged outside the machine by a drainage pump 57. Subsequently, a water supply step of newly supplying washing water, a rinsing step of jetting washing water from the washing nozzle 55 to rinse dishes soiled with detergent or garnish (the stains attached to the dishes are also called garbage), The draining step is repeated four times in succession, and the operation of the cleaning step is completed. Reference numeral 58 denotes a control device that controls operations of the cleaning pump 53, the heater 54, and the like.
[0005]
[Problems to be solved by the invention]
Conventionally, a dishwasher has problems such as low tableware storability due to mounting two sets of pumps for washing and drainage, high cost, and low rinsing performance due to a large amount of residual water. Was.
[0006]
In order to solve the above-mentioned problem, as described in Japanese Patent Application Laid-Open No. Hei 9-131293 , we perform cleaning and drainage with a single motor, reduce the size of the cleaning mechanism to increase the tableware storage volume, and reduce the cost. achieving reduction, we have proposed that attempt to improve the stability and drainage performance of the cleaning performance.
[0007]
Problems in these configurations will be described with reference to FIG. First, when the garbage filter is significantly clogged during cleaning, the pump 61 falls into an extreme shortage of water absorption, and the first impeller 62 for cleaning and discharging is in an air dust state, and the discharging capacity is reduced. At this time, the pressure balance between the first impeller 62, the second impeller 63 for discharging drainage, and the third impeller 64 for preventing air dust is lost, and the flush water level that has maintained a constant value in the drainage path 65 is reduced. It may fall into a rising state while fluctuating. In the worst case, there is a problem that the washing water is discharged outside the machine during the washing.
[0008]
In addition, at the time of drainage, the cleaning water in the pump 61 is drained in order from the top, so that the cleaning water in the first casing 66 is exhausted first, and the air casing becomes airy. The third impeller 64 inhales a part of the air in the casing 66 of the third impeller. For this reason, the 2nd impeller 63 will be in an air stagnation state early, and there existed a subject that the drainage capacity of the 2nd impeller 63 fell and the residual water increased.
[0009]
In addition, although this is a problem generally related to a vertical pump, there is a problem that excessive drainage noise is generated due to the first casing 66 being always in an air-gathered state at the initial stage of drainage.
[0010]
The mounting portion 67 to the motor of the second impeller 63, the pump lock and residual due to foreign matter Zan'na like because there is no flow characteristics on wash water vortex impeller rather easily deposited, foreign matter bite the impeller There were problems such as generation of off-flavor due to the accumulation of greens.
[0011]
Therefore, the present invention solves the problems of the above-described conventional configuration, and has an object to stabilize a cleaning water level in a drainage path during cleaning .
[0012]
[Means for Solving the Problems]
In the dishwasher of the present invention , the pump for pressurizing the washing water includes a first casing that discharges the washing water to a washing nozzle by a first impeller, and a vortex-type second pump that is provided below the first casing. A second casing that discharges washing water out of the machine by the second impeller; and a first casing, a second casing, and a washing tank that communicate with the second casing, and between the first casing and the second casing. And a centrifugal type third impeller provided on the cleaning water guide side of the vortex-type second impeller, and the first impeller is provided from the cleaning water guide. Alternatively, a suction port for the third impeller is provided on a concentric circle of the rotation shaft of the motor, and a hole communicating with the washing water guide portion is provided in the second casing, and the second casing is provided by the third impeller. A portion of the discharged wash water is obtained by the return to the washing water guide portion.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention described in claim 1 of the present invention is directed to a cleaning tank, a tableware for storing tableware, a cleaning nozzle for spraying cleaning water, a pump for pressurizing the cleaning water by rotation of a motor, and a pump for rotating the motor. and control means for controlling a reverse inversion driving, with substantially provided in the vertical direction the rotation axis of the motor, the pump comprises a first casing for discharging the cleaning water to the cleaning nozzle by a first impeller, the a second casing for discharging the washing water to the outside by the first second impeller vortex type which is provided below the casing, communicating with said first casing and the second casing and the cleaning tank, A washing water guide provided between the first casing and the second casing; and a centrifugal third impeller provided on the washing water guide side of the vortex-type second impeller. wherein the washing water Suction port from the inside to the first impeller or third impeller together with Keru set in each concentric axis of rotation of the motor, a hole which communicates with the washing water guide portion to the second casings grayed, the first A part of the washing water discharged from the third impeller is returned to the washing water guide part by the third impeller, so that a part of the washing water discharged from the third impeller is returned to the washing water guide part. , And acts to discharge the remainder into the second casing and the drainage passage. That is, by providing the circulation path of the washing water in the pump, the function of preventing the suction of air from the inside of the drain passage of the third impeller is ensured. Even when the first impeller is in an air stagnation state and the discharge capacity is reduced, and the pressure balance between the first impeller, the second impeller for drainage discharge and the third impeller for air squirt prevention is lost, It is possible to prevent the washing water in the drain passage from being discharged outside the machine by reducing the discharge capacity into the drain passage, and to stabilize the washing water level in the drain passage during washing.
[0014]
Invention described in 請 Motomeko 2, a hole communicating with the third impeller side of the vanes of the swirl formed in the second impeller inside provided, the washing water in the center of the second impeller By generating the flow, the flow of the washing water can be generated substantially at the center of the second impeller, and the pressure difference between the first impeller and the third impeller during the rotation of the pump can be reduced. Acts to reduce.
[0015]
Therefore, it is possible to reduce the drainage noise due to the accumulation of foreign matter, avoid the motor lock, and reduce the drainage noise due to the reduction of excessive mixing of the air during drainage.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0017]
(Embodiment 1)
FIG. 1 is a sectional view of a dishwasher equipped with a vertical washing and drainage integrated pump , and FIG. 2 is a sectional view of a vertical washing and drainage integrated pump . 1 is a washing tank, 2 is a tableware basket for storing tableware, which is provided in the washing tank 1. Reference numeral 3 denotes a pump for pressurizing the washing water, 4 a heater for heating the washing water and tableware, and 5 a washing nozzle having an injection port 6 for ejecting the washing water. Reference numeral 7 denotes a filter for separating residual vegetables, and reference numeral 8 denotes a control device for controlling the cleaning pump 3, the heater 4, and the like.
[0018]
The pump 3 has a first casing 10 for discharging cleaning water to the cleaning nozzle 5 by a first impeller 9 of a centrifugal type and a second casing 11 for discharging cleaning water to a second impeller 11 of a vortex type. And a centrifugal third impeller 13 disposed on the back surface of the second impeller 11 for discharging washing water into the second casing 12 during washing. Further, a washing water guide portion 15 communicating in three directions of the first casing 10, the second casing 12, and a water conduit 14 provided at the bottom of the washing tank 1 is provided between the two casings.
[0019]
16 is a first suction port communicating from the washing water guide 15 to the first casing 10, 17 is a second suction port communicating from the washing water guide 15 to the second casing 12, and 18 is a washing water guide. 15 is a third suction port communicating with the second casing 12. Further, 19 is a motor for driving the pump 3, Ri Oh 2-pole induction motor, which switches the connection of the main winding and an auxiliary winding of a capacitor and a motor 19 for driving the motors 19 performs forward reverse It is.
[0020]
The first impeller 9 and the second impeller 11 and the third impeller 13 is mounted on the output shaft of the motor 19, the impeller La is to rotate in the same direction. Reference numeral 21 denotes a drainage path for discharging the washing water out of the machine. Reference numeral 22 denotes a portion for attaching the second impeller 11 to the motor 19. Further, 23 is a resistor on a substantially disk fixed in the washing water guide portion 15 between the shafts of the first impeller 9 and the second impeller 11, and the outer diameter is larger than the outer diameter of the third suction port 18. Is also set large. The first impeller 9 may be a centrifugal type, a vortex type, or another type.
[0021]
Hereinafter, the operation of the present embodiment will be described. First, it is assumed that the tableware is stored in the tableware basket 2 and is attached to a predetermined position of the washing tank 1 and a switch (not shown) is turned on. When the switch is turned on to start the operation, the control device 8 first executes a water supply step of supplying a predetermined amount of cleaning water to the cleaning tank 1. Subsequently, a main washing step of injecting the washing water pressurized by the pump 3 together with the detergent from the ejection ports 6a to 6f provided in the washing nozzle 5 is executed. After the main washing process for a predetermined time, the process enters a draining process in which washing water containing dirt washed off from tableware or the like is discharged outside the machine by the pump 3. Subsequently, a water supply step of supplying fresh washing water, a rinsing step of spraying washing water from the first washing means to rinse dishes contaminated with detergent or garbage, and a draining step are successively performed. The cleaning step is repeated.
[0022]
The configuration of the pump 3 and the operation in the cleaning step will be described in detail. The washing tank 1 and the pump 3 communicate with the first impeller 9 via the first suction port 16 from the washing water guide 15 connected to the water conduit 14 at the bottom of the washing tank 1, and the second suction port 17 and the second impeller 11, and at the same time, from the third suction port 18 to the third impeller 13. Here, the first impeller 9 and the third impeller 13 are set to have a shape capable of sucking and discharging the washing water from the washing water guide portion 15 when rotating in the clockwise direction and the second impeller 11 rotating in the counterclockwise direction. And each has a configuration called a centrifugal pump and a vortex pump. In general, a vortex pump is capable of switching between the direction of discharge and the direction of suction depending on the direction of rotation.
[0023]
In the main washing step and the rinsing step, the cleaning water is guided from the first suction port 16 of the cleaning water guide section 15 to the first impeller 9 by rotating the motor 19 clockwise.
[0024]
Here, the first impeller 9 works effectively, and the cleaning water is discharged to the cleaning nozzle 5 to perform cleaning. On the other hand, in the same rotation direction, the second impeller 11 first discharges the washing water of the drain passage 21 from the second suction port 17, and here the third impeller 13 discharges the washing water from the third suction port 18. By the function of being discharged into the second casing 12, a part of the discharged cleaning water is returned from the second suction port 17 to the cleaning water guide portion 15, and the remaining cleaning water is discharged into the drain passage 21. Will stay. Therefore, the air does not enter the first casing 10 as well as the second casing 12 and the washing water can be stably discharged to the washing nozzle 5.
[0025]
In addition, in the conventional configuration, the suction force of the third impeller 13 acts from the direction directly opposite to the suction direction of the first impeller 9 at the time of cleaning, so that the first impeller 9 becomes a suction resistance and becomes a cleaning discharge pressure. However, by providing the resistor 23 between the first suction port 16 and the third suction port 18, the influence of the suction force by the third impeller 13 can be reduced. Therefore, the suction resistance of the first impeller 9 decreases, and the cleaning discharge pressure can be increased.
[0026]
The water level of the washing water remaining in the drain passage 21 is kept constant by optimizing the blade outer diameter and the blade height of the third impeller 13.
[0027]
Further, in the drainage process by rotating counterclockwise the motor 19 in forward and backward inversion hand stage, washing water is guided from the second suction opening 17 of the washing water guide portion 15 to the second impeller 11. Here, the second impeller 11 works effectively to discharge the washing water out of the machine. At this time, in the conventional configuration, since the air in the first casing 10 is sucked by the third impeller 13, the performance in the second casing 12 is deteriorated due to the mixing of air at an early stage. In the embodiment, the action of the resistor 23 makes it difficult for the third impeller 13 to suck the air accumulated in the first casing, so that the timing at which the air enters the second casing 12 can be delayed. .
[0028]
That is, at the time of drainage, the drainage capacity can be maintained for a longer time, and the amount of residual water can be reduced. Further, the third impeller 13, which is a centrifugal impeller, discharges washing water from the third suction port 18 into the second casing 12 in the same manner as in the washing step, so that the drainage performance can be improved.
[0029]
Regarding the rotation direction of the motor, the same effects can be obtained regardless of which rotation direction is used for cleaning and discharging.
[0030]
As described above, in the first embodiment, particularly, by disposing the substantially disk-shaped resistor between the first impeller and the second impeller, the rinsing performance is improved by reducing residual water, and It is possible to obtain a dishwasher with improved water saving, washing performance and drainage performance.
[0031]
(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described. FIG. 3 is a cross-sectional view of the vertical washing and drainage integrated pump, and FIG . 4 is a cross-sectional view of the pump. The basic configuration of the mechanical components is the same as that of the first embodiment shown in FIG. Is omitted.
[0032]
Further, in the second embodiment, the resistor 23 is not provided, and a hole 24 communicating with the third impeller 26 is provided on the disk of the second impeller 25 and at a position inside the swirl vanes. This has a special effect in that the configuration is characterized. The first impeller 9 may be a centrifugal type, a vortex type, or another type.
[0033]
Hereinafter, the operation of the second embodiment will be described. The basic operation relating to the cleaning step is the same as in the first embodiment, and a description thereof will be omitted. In the conventional cleaning process, the mounting portion 22 of the second impeller 25 to the motor 19, which has conventionally had no flow of cleaning water and is likely to accumulate foreign matter, is located on the third impeller 26 side provided on the disk of the second impeller 25. Since the flow of the cleaning water is generated by the communicating holes 24, the accumulation of foreign matters can be significantly reduced.
[0034]
Further, in the conventional configuration, the cleaning water pressurized and discharged by the third impeller 26 is discharged into the second casing 12, so that the cleaning water pressurized and discharged by the second impeller 25 violently collides with the cleaning water. . Particularly in the last stage of the drainage process in which air was mixed, the washing water and the air were turbulent and very loud noise was generated.
[0035]
However, according to the present embodiment, by providing the hole 24 between the second impeller 25 and the third impeller 26, the pressure difference between the two impellers is reduced, and drainage noise can be significantly reduced. It should be noted that it is considered that the provision of a plurality of holes 24 at the positions symmetric with respect to the points is preferable in order to eliminate the pressure difference between the second impeller 25 and the third impeller 26 and to maintain the balance due to the rotation of the impeller itself. Even if the number is one, the effect of this embodiment can be sufficiently obtained even if the installation position is not the point target position.
[0036]
Further, in the water supply step, in the conventional configuration, there is a problem that the air accumulated in the mounting portion 22 of the second impeller 25 to the motor 19 is difficult to escape, and an air noise is generated at an early stage of the cleaning step. Then, the air easily escapes to the outside of the pump 3, so that no noise is generated in the initial stage of the cleaning process.
[0037]
As described above, by providing a hole communicating with the third impeller on the disk of the second impeller and inside the swirl vanes, it is possible to prevent foreign substances from accumulating in the pump and to perform a cleaning process. It is possible to obtain a dishwasher in which noise at the initial stage and at the time of drainage is greatly reduced.
[0038]
(Embodiment 3)
Hereinafter, a third embodiment will be described. FIG. 5 is a cross-sectional view of the vertical washing and drainage integrated pump, and FIG . 6 is a cross-sectional view of the pump. The basic configuration of the mechanical components is the same as that of the first embodiment shown in FIG. Omitted. In the third embodiment, the resistor 23 is not provided, and a hole 27 communicating from the washing water guide 15 to the second casing 28 is newly provided. It has an effect. The first impeller 9 may be a centrifugal type, a vortex type, or another type.
[0039]
The operation of the third embodiment will be described below. The basic operation relating to the cleaning step is the same as in the first embodiment, and a description thereof will be omitted. In particular, in the cleaning step, the third impeller 13 discharges the cleaning water into the second casing 28 and the drain path 21 to prevent the suction of air from the drain path 21, but the filter 4 is severely clogged. In this case, the suction flow rate to the pump 3 becomes insufficient, and the pump 3 draws the washing water from the drain passage 21. As a result, the pump 3 may fall into a very unstable state, and the cleaning water may be discharged to the outside of the machine, causing the heater 7 to be burned out.
[0040]
Therefore, it is necessary to reduce the apparent discharge capacity of the third impeller 13 so that the washing water does not flow out of the apparatus even when the pump 3 is in an unstable state. Therefore, according to the configuration of the present invention, a part of the washing water discharged from the third impeller 13 can be returned to the washing water guide 15 again through the hole 27.
[0041]
That is, the apparent discharge capability can be reduced without lowering the capability of discharging the cleaning water into the second casing 28. Therefore, even in an unstable state in the washing step, the washing water can be stabilized without draining the washing water out of the machine. Even if the number of the holes 27 is one, the effect of the present invention can be sufficiently obtained even if the installation position is not the point target position.
[0042]
As described above, by providing the hole communicating with the second casing from the washing water guide portion, it is possible to provide a dishwasher that stabilizes the washing water level in the drainage path particularly during washing. is there.
[0043]
(Embodiment 4)
Hereinafter, a fourth embodiment will be described. FIG. 7 shows a cross section of the vertical washing / draining integrated pump, but the basic configuration of the mechanical components is the same as that of the first embodiment shown in FIG.
[0044]
In FIG. 7, a water conduit 29 that guides washing water from the washing tank 1 to the pump 3 communicates with both the second casing 28 and the washing water guide 15, and connects the suction port 30 of the second impeller 25 to the second. The second casing 28 is provided on the side wall . Reference numeral 23 denotes a resistor on a substantially disk fixed in the washing water guide portion 15 between the shafts of the first impeller 9 and the second impeller 25, and the outer diameter is larger than the outer diameter of the third suction port 18. Is also set large. A hole 24 communicating with the third impeller 26 is provided at a position on the disk of the second impeller 25 and inside the swirl vanes. Further, a hole 27 communicating from the washing water guide 15 to the second casing 28 is provided. The first impeller 9 may be a centrifugal type, a vortex type, or another type.
[0045]
Hereinafter, the operation of the fourth embodiment will be described. The basic operation relating to the cleaning step is the same as in the first embodiment, and a description thereof will be omitted.
[0046]
Here, the present embodiment has all the functions of the first to third embodiments described above, but the effect is further enhanced by having all of these configurations.
[0047]
In other words, the provision of the resistor 23 and the hole 27 on the second casing 28 greatly reduces the water absorption resistance received by the first impeller 9, so that the cleaning discharge pressure further increases and the cleaning performance is improved. Is greatly improved. Further, by providing the suction port 30 of the second impeller 25 on the side wall of the second casing 28 and providing the resistor 23, the residual water at the time of drainage is further reduced, thereby improving the rinsing performance and accompanying the improvement. This can further save water.
[0048]
Further, by providing the hole 24 on the second impeller 25 and the hole 27 on the second casing 28, the air can be more easily removed when the air is in the air condition. The time required for recovery is further shortened, so that cleaning performance and drainage performance can be improved, reliability can be improved, and drainage noise and cleaning noise can be significantly reduced.
[0049]
Although the holes 24 and 27 are provided at various places in the pump 3, the diameter thereof is set to be equal to or larger than the minimum area in the water conduit 29, which causes a problem that foreign matter is caught or accumulated. Never.
[0050]
As described above, according to the embodiment of the present invention, it is possible to obtain a dishwasher that has high stability and reliability of a pump at the time of washing and draining, and can significantly reduce both washing, draining performance, washing, and draining noise. Can be done.
[0051]
【The invention's effect】
As described above, according to the first aspect of the present invention, a washing tank, a tableware for storing dishes, a washing nozzle for injecting washing water, and a pump for pressurizing the washing water by rotation of a motor, Control means for controlling the forward / reverse inversion drive of the motor, wherein a rotation axis of the motor is provided in a substantially vertical direction, and the pump is a first impeller for discharging cleaning water to a cleaning nozzle by a first impeller. A casing, a second casing configured to discharge washing water out of the machine by a vortex-type second impeller provided below the first casing, the first casing, the second casing, and a washing tank. And a washing water guide portion provided between the first casing and the second casing, and a centrifugal type second provided on the side of the washing water guide portion of the vortex type second impeller. With three impellers A suction port from the washing water guide portion to the first impeller or the third impeller is provided on a concentric circle of a rotation shaft of a motor, and a hole communicating with the washing water guide portion is provided in the second casing, Since a part of the washing water discharged to the second casing is returned to the washing water guide portion by the third impeller, the washing water level in the drain passage at the time of washing can be stabilized.
[0052]
Further, according to the second aspect of the present invention, a hole communicating with the third impeller side of the vanes of the swirl formed in the second impeller inside provided, the washing water in the center of the second impeller it is so arranged to generate a flow, eliminate poor drainage due to foreign matter deposited in the drainage impeller, a decrease in drainage noise may FIG Rukoto.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a dishwasher according to first to fourth embodiments of the present invention; FIG. 2 is a vertical sectional view of a main part of a pump according to the first embodiment of the present invention; FIG. 4 is a vertical cross-sectional view of a main part of a pump according to a second embodiment. FIG. 4 is a horizontal cross-sectional view of a main part of a pump of the dishwasher. FIG. 5 is a vertical cross-sectional view of a main part of a pump according to a third embodiment of the present invention. FIG. 6 is a horizontal cross-sectional view of a main part of a pump of the dishwasher. FIG. 7 is a vertical cross-sectional view of a main part of a pump according to a fourth embodiment of the present invention. FIG. FIG. 9 is a longitudinal sectional view of a main part of a conventional dishwasher pump.
DESCRIPTION OF SYMBOLS 1 Washing tank 2 Tableware basket 3 Pump 4 Heater 5 Washing nozzle 9 First impeller
10 first casing 11 second impeller
12 second casing 13 third impeller 15 washing water guide
24 holes
27 holes

Claims (2)

A washing tank, a tableware for storing the dishes, a washing nozzle for injecting washing water, a pump for pressurizing the washing water by rotation of a motor, and control means for controlling forward / reverse inversion driving of the motor, A rotary shaft of the motor is provided in a substantially vertical direction, and the pump includes a first casing for discharging cleaning water to a cleaning nozzle by a first impeller , and a vortex-type pump provided below the first casing. a second casing for discharging the washing water to the outside by the second impeller, communicating with said first casing and the second casing and the cleaning tank, and, of the first casing and the second casing a washing water guide portion provided therebetween, and a centrifugal third impeller provided in the washing water guide portion side of the second impeller of the swirl, from said washing water guide portion and the first Impeller or No. Discharge into the impeller suction port together with Keru set on a concentric circle of the rotating shaft of the motor, respectively, said holes communicating with the washing water guide portion provided in the second casing, the second casing by the third impeller A dishwasher configured to return a portion of the washed water to the washing water guide . 2. A flow passage for washing water at a central portion of the second impeller, wherein a hole communicating with the third impeller is provided inside the swirl type blade formed on the second impeller. of the dishwasher.

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