JP2002315715A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an undesirable force from being applied to the connected section between the discharge port of a pump and a nozzle arm at the time of the pulling-out/pushing-in motion of a washing box, and maintain a high water tightness. SOLUTION: A pump casing 80 and a pump motor 81 are respectively attached to a motor attaching plate 82 made of a metal with machine screws. The motor attaching plate 82 is attached to a boss 22 which is erected on the bottom wall of the washing box 2 through a cushion 87 made of a rubber with machine screws 86. Also, the rear side of the pump motor 81 is attached to the bottom wall 21 of the washing box 2 in a manner to support the lower section with a semi-annular motor holding band 85. Thus, the washing-cum- draining pump 8 is firmly fixed to the lower surface of the bottom wall 21 of the washing box 2. Therefore, the washing-cum-draining pump 8 does not greatly shake even by an impact at the time of pulling-out/pushing-in of the washing box 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dishwasher,
Particularly, the present invention relates to a dishwasher suitable for a built-in type.

[0002]

2. Description of the Related Art In general, a household dishwasher introduces tap water into a washing cabinet, stores the tap water at a bottom thereof, and then operates a pump to suck the stored water and feed it to a nozzle.
It has a configuration in which water is vigorously jetted from a nozzle to wash dishes and the like housed in a washing cabinet. In this type of conventional dishwasher, a washing cabinet is disposed inside a housing, and a door is provided on a front surface of the housing, which pivots downward and forward, and the dish basket is horizontally moved forward with the door opened. It has a drawer-free structure.

[0003] In recent years, with the spread of system kitchens, built-in type dishwashers for incorporation into system kitchens have been marketed. As a dishwasher suitable for a built-in type, a dishwasher described in JP-A-2000-139799 or the like is known. This dishwasher is a so-called drawer-type dishwasher, in which a washing cabinet in which a dish basket for storing dishes is housed can be pulled out forward together with a door also serving as a front plate. When the washing cabinet is pulled out, the upper surface of the washing cabinet is wide open so that dishes can be taken in and out from above, and when the washing cabinet is pushed into the housing, the upper lid was waiting in the upper space inside the housing. Is lowered to close the upper opening of the washing box.

[0004]

In a conventional general front-opening dishwasher, a washing and drainage pump is disposed below the bottom of a washing cabinet, and its mounting structure is fastened and held by a metal band. It has become. However, in the drawer-type dishwasher as described above, a large inertia force is generated in the washing / draining pump that moves integrally during the drawer / push-in operation of the washing chamber, and a small vibration is also generated during the movement. Therefore, the displacement of the pump with respect to the cleaning chamber is likely to occur. Even if such a displacement is very small, the fitting portion connecting the discharge port of the pump and the water injection arm base may be loosened, which may cause water leakage. In addition, there is a possibility that damage may be caused by applying a force to the mounting portion.

Further, conventionally, in a dishwasher, in order to prevent overflow of water from the washing chamber when water supply cannot be stopped due to, for example, a failure of a water supply valve, an abnormal water level in the washing chamber is detected. A switch for detecting an abnormal water level is provided, and based on the detection result of this switch, it is determined that the water level in the cleaning chamber is abnormal, an abnormality is notified, or a drainage pump is operated to start the operation from the cleaning chamber. And forced drainage. However, in the drawer-type dishwasher as described above, for example, when the operation is temporarily stopped to add dishes during washing and the wash cabinet is pulled out, the water stored in the wash cabinet greatly undulates, In spite of the fact that the water level is actually normal, there is a possibility that the switch for detecting an abnormal water level is activated and it is determined that the water level is abnormal.

The present invention has been made to solve such a problem, and a first object of the present invention is to:
An object of the present invention is to provide a drawer-type dishwasher with high reliability that can securely and firmly fix a washing / draining pump and prevent damage to an attached portion and leakage of water at a water-sealed portion. Further, a second object of the present invention is to provide a dishwasher which does not make an erroneous determination that the water level is abnormal even when a large wave occurs due to the drawer / push-in operation of the washing chamber. It is in.

[0007]

Means for Solving the Problems and Effects A dishwasher according to a first invention made to solve the above-mentioned problems, comprises:
A washing box for accommodating tableware, a water jet nozzle provided inside the washing box, and water attached to the outer surface of the washing box and suctioned at the bottom of the washing box and pumped to the nozzle. And a pump, wherein the discharge port of the pump is fitted into a communication opening to the nozzle formed in the washing box, and at least one portion of the pump is attached to an outer wall surface of the washing box. And directly or indirectly fixed.

[0008] The term "adhesion" as used herein refers to a strong fixation that typically does not cause displacement or drop off unless breakage occurs, such as screwing with a screw.

That is, in the dishwasher according to the first invention, at least one portion of the pump is washed by screws or the like instead of mounting the pump motor by tightening and holding as in the conventional dishwasher. Directly or indirectly to the outer wall surface of the Therefore, even if a large external force acts on the pump, there is no displacement of the pump with respect to the washing box, and high watertightness can be maintained at the fitting point between the pump discharge port and the communication opening of the washing box.

As one mode of the indirect fixing, the pump includes a pump casing having an impeller therein;
A pump motor for rotating the impeller; and a mounting plate between the pump casing and the pump motor to which the two are fixed, wherein the mounting plate is fixed to an outer wall surface of the washing box. Can be.

Normally, the pump casing is made of a synthetic resin in terms of workability and the like, while the mounting plate can be made of a material having higher rigidity such as a metal plate. In order to prevent an unreasonable load from being applied to the fitting point between the pump discharge port and the communication opening of the washing chamber, it is preferable to fix the pump at a position as close to the fitting point as possible. When the pump casing is made of a synthetic resin, fixing the pump casing itself to the outer wall surface of the washing box has a problem in terms of robustness. On the other hand, according to the above configuration, since the mounting plate provided between the pump casing and the pump motor is fixed to the outer wall surface of the washing chamber, the pump motor is indirectly fixed at a position near the fitting point. The watertightness of the fitting point is further improved.

In the dishwasher according to the first aspect of the present invention, the pump is fixed to the outer wall surface of the washing chamber at a plurality of places, and two or more of the fixed directions and the fitting direction of the discharge port of the pump are different. Are preferably in the same direction. According to this configuration, when the discharge port of the pump is fitted into the communication opening of the cleaning chamber, the discharge port is inevitably kept straight with respect to the communication opening. Even when an elastic seal member is sandwiched between the seal members, no local excessive force is applied to the seal member. Therefore, the adhesiveness is improved, high watertightness can be achieved, and this can be maintained for a long time.

Further, in the dishwasher according to the first invention, the rear side of the pump motor may be fastened and held to the outer wall surface of the washing chamber by a band-shaped member.

The dishwasher according to the first aspect of the present invention is applied to a dishwasher in which the washing box has an opening for taking in and out of dishes on an upper surface and can be pulled out forward from a housing having an open front. Thereby, the effect of the above configuration can be particularly exhibited. In other words, even when a large shock or vibration is applied when the washing box is pulled out of or pushed into the housing, the pump is firmly fixed to the washing box. There is no deterioration, and damage to the fixed portion itself is unlikely to occur.

Furthermore, the pump is fixed to the outer wall surface of the washing chamber at a plurality of locations, and a straight line connecting any two of the locations and a straight line extending in the drawing direction of the washing chamber are substantially orthogonal or close to each other. By doing so, the strength of the fixed portion can be further increased.

According to a second aspect of the present invention, there is provided a dishwasher having an open front surface, a drawer that can be pulled out from the front of the housing, and a tableware to be taken in and out of the upper surface. Storage having an opening for water, a nozzle for water injection provided inside the cleaning storage, and a pump attached to the bottom of the cleaning storage and sucking water stored in the bottom of the cleaning storage and pumping the water to the nozzle. And in a dishwasher comprising: a connection point between a discharge port of the pump and a washing box;
A straight line connecting the center of gravity of the pump motor constituting the pump,
The pump is arranged so that straight lines extending in the direction in which the washing box is drawn out are parallel or oblique at a small angle to each other.

According to the dishwasher according to the second aspect of the present invention, the straight line connecting the connecting point connecting the discharge port of the pump to the washing box and the center of gravity of the pump motor, and the straight line extending in the drawing direction of the washing box. The arrangement of the pumps is determined so that they are parallel or nearly parallel. For this reason, of the stress applied to the connection portion due to the weight of the pump motor when the cleaning chamber is vigorously pulled out or pushed in, the force component acting in the torsion direction has no component, or even a small component. Therefore, it is possible to prevent deterioration of the seal member inserted at the connection point, and it is effective in preventing the occurrence of water leakage from the connection point.

A dishwasher according to a third aspect of the present invention for solving the above-mentioned problem has a housing having an open front and a drawer which can be pulled out forward from the housing so as to put dishes in and out of the upper surface. Storage having an opening for water, a nozzle for water injection provided inside the cleaning storage, and a pump attached to the bottom of the cleaning storage and sucking water stored in the bottom of the cleaning storage and pumping the water to the nozzle. Wherein the pump comprises a pump motor, an impeller attached to a shaft of the motor, and a casing surrounding the impeller, and a straight line extending in a direction in which the shaft of the motor extends. And the pump motor is arranged so that straight lines extending in the direction in which the washing box is drawn out are parallel or oblique to each other at a small angle.

According to the dishwasher according to the third aspect of the present invention, the shaft of the pump motor extends substantially in the same direction as the direction in which the washing box is pulled out. Therefore, when an inertia force or an impact force is applied to the pump motor when the cleaning chamber is vigorously pulled out or pushed in, when the inertia force or the impact force thereby acts on the pump motor, the direction from the direction having a radial direction or an angle close to the radial direction to the motor shaft. There is almost no component of the acting force. Therefore, inclination and bending of the motor shaft due to such a force can be prevented. As a result, undesired friction does not occur between the bearing that rotatably holds the motor shaft and the seal member that seals the periphery of the shaft with the motor shaft, and generation of abnormal friction noise can be avoided. In addition, high water sealability can be maintained.

A dishwasher according to a fourth aspect of the present invention for solving the above problems stores water in the bottom of a washing cabinet which can be pulled out forward from a housing having an open front and stores the water in the dishwasher. In a dishwasher for washing dishes stored in the washing cabinet by sucking and spraying it into the washing cabinet, a) a water level detecting means for detecting a water level of water stored in the washing cabinet, and b) the water level detection Abnormality determining means for determining whether or not the water level is abnormal based on the detection result of the means; c) a draw-out operation or a push-in operation of the washing chamber from the housing;
Or a recognition unit for recognizing an internal operation related to the operation,
Wherein the abnormality determining means receives a result of recognition by the recognizing means and changes a reference for determining an abnormal water level or temporarily suspends the determination.

According to the dishwasher according to the fourth aspect of the present invention, the washing box is placed in the housing within a time period in which it is supposed that the surge of the stored water immediately after the drawing or pushing operation of the washing box is performed is large. Even if the water level becomes such that it is determined that the water level is abnormal in the stored steady state, the abnormality determination means does not immediately determine that the water level is abnormal. Therefore, although the level of the stored water in the washing chamber is normal, the buzzer for anomaly notification may sound due to a large undulation caused by an impact or the like when the washing chamber is pulled out or pushed in, or may be abnormal. It is possible to avoid such a problem that the drainage operation is started when necessary. Also,
If it is not immediately after the draw-out / push-in operation of the washing chamber, it is quickly recognized that the water level has reached an abnormal level that will lead to overflow of water, and abnormal measures such as announcing abnormalities and starting drainage are taken. You can take it.

Here, the recognizing means may be, for example, a switch means for turning on / off in accordance with a pull-out operation and a push-in operation of the washing box. The switch means does not necessarily need to recognize the pull-out operation and the push-in operation of the cleaning chamber. For example, in a configuration in which the upper lid moves up and down in conjunction with the pull-out / press-in operation of the cleaning chamber, the vertical movement of the upper lid and the upper lid May be used as a means for detecting the position of. According to this configuration, it is possible to reliably perform the above-described change of the abnormality determination in response to the taking in and out of the cleaning cabinet. Further, the recognition means may recognize an internal operation which is generated as a sign of considerably high reliability for performing the pull-out / push-in operation of the cleaning chamber. For example, the operation of temporarily stopping the operation during the cleaning operation is performed. An internal operation that occurs in response to the above may be recognized.

According to a fourth aspect of the present invention, the abnormality determination means suspends the determination of the abnormal water level within a predetermined time after receiving the recognition result by the recognition means, and after the predetermined time has elapsed. The determination of the abnormal water level can be made in the first step. According to this configuration, an abnormal water level is notified or water is forcibly discharged regardless of the water level in the cleaning chamber within a certain period of time after the cleaning chamber is pulled out or pushed into the housing. No action is taken. Therefore,
Even if a very large undulation is generated in the washing box due to the draw-out or push-in operation of the washing box, it is not erroneously determined that the water level is abnormal.

Further, the water level detecting means detects that the water stored in the washing chamber has reached a predetermined water level, and the abnormality judging means detects when the detection result by the water level detecting means has continued for a predetermined time or more. It can be configured to determine that the water level is abnormal. During a normal washing operation or a rinsing operation, the water level moves up and down due to the injection of water. According to such a configuration, the up and down movement of the water for a relatively short time caused by such injection of water or the like is performed. Since the influence can be eliminated, it is possible to accurately determine that the water level has reached an abnormal level.

According to another aspect of the fourth invention, the water level detecting means detects that the water stored in the washing chamber has reached a predetermined water level, and the abnormality determining means uses the water level detecting means. When the detection result has continued for a predetermined time or more, it is determined that the water level is abnormal, and the length of the predetermined time is set longer than the certain time or less within a certain time after receiving the recognition result by the recognition means. Is also good. In this configuration, even if within a certain period of time after the drawer or push-in operation of the cleaning chamber is performed, if the state that can be regarded as an abnormal water level is long in a steady state, the abnormal water level is determined. The judgment is made and the abnormality notification and the abnormality countermeasures are taken. Therefore, for example, even when the drawer and push-in operation of the cleaning chamber is repeated in a relatively short time due to mischief or the like, it is possible to recognize that the water level is abnormal, and it is possible to more reliably prevent water from overflowing from the cleaning chamber. Can be prevented.
Furthermore, even in such a situation, even if the water level is normal, it can be assumed that the drawer and push-in operations of the washing chamber are repeated more intensely as the state in which the water level reaches the predetermined water level continues for a longer time. Therefore, even if the water level is not actually abnormal, determining that the water level is abnormal and performing the abnormality notification is useful in that a warning is issued to the user.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dishwasher according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are schematic side sectional views showing the entire configuration of the dishwasher according to the present embodiment. FIG. 1 shows a state where a washing box is stored in a housing, and FIG. 2 shows a state where the washing box is drawn out of the housing. Is shown.

First, a schematic configuration of the dishwasher will be described with reference to FIGS. A cleaning cabinet 2 having an upper surface opening 3 is disposed inside a housing 1 having an open front surface.
A dish basket (not shown) for arranging the dishes is installed in the inside. The washing cabinet 2 is integrated with a door 4 which also serves as a front plate for closing a front opening of the housing 1, and is substantially horizontally moved forward along a rail 5 installed substantially horizontally inside both side walls of the housing 1. It can be freely pulled out. A rotatable arm 6 having a plurality of nozzles formed on the upper surface is provided at the center of the bottom of the washing chamber 2. At the bottom of the washing box 2, a water tank 7 is formed, which is recessed one step lower. At the bottom of the bottom of the washing box 2, a washing / draining pump 8 is arranged in a state of lying substantially horizontally. Operates as a washing pump, the water sucked from the water storage tank 7 is sent out to the arm 6 and injected into the washing chamber 2 from the nozzle. An extendable water supply pipe 9 having a water supply valve (not shown) is connected to the rear surface of the cleaning chamber 2. When the water supply valve is opened, water supplied from an external water tap or the like is supplied through the water supply pipe 9 to the cleaning chamber 2. Poured in.

An upper lid 10 for closing the upper opening 3 of the washing box 2 is provided in the housing 1 above the washing box 2. One end of the upper lid 10 is pivotally supported inside the side wall surface of the housing 1, and the other end is swingably supported by a pair of left and right parallel links 11 pivotally supported by the side surface of the upper lid 10.
A biasing device 12 is provided at the rear of the upper lid 10 for selectively biasing the upper lid 10 in both up and down directions according to the position of the upper lid 10. Thus, in a state in which the washing box 2 is housed in the housing 1, the upper lid 10 is in close contact with the upper surface of the washing box 2 to close the upper opening 3 as shown in FIG. 2, the upper lid 10 is held in a state of being pushed up while protruding forward as shown in FIG.

One of the features of the present dishwasher is the mounting structure of a washing and drainage pump 8 arranged at the bottom of the washing box 2. Next, the mounting structure of the cleaning and drainage pump 8 will be described with reference to FIGS. FIG. 3 is a partial cross-sectional side view of a main part showing a detailed configuration near the bottom of the washing cabinet of the dishwasher, FIG. 4 is a bottom view showing a detailed configuration around the washing and drainage pump, and FIG. FIG. 6 is a cross-sectional view taken along line BB ′ in FIG. 5, and FIG. 7 is an enlarged view of the vicinity of a portion A in FIG.

As shown in FIG. 1, the washing and draining pump 8 includes a pump casing 80 made of a synthetic resin having a washing impeller 80a and a draining impeller 80b therein, and a motor shaft 81a coaxial with both impellers 80a and 80b. And a pump motor 81 that is driven to rotate via the motor. The inside of the pump casing 80 is partitioned into a washing pump room and a drainage pump room, and the washing pump room is provided therein with the washing impeller 8.
0a, and is opened to the outside,
01 and a discharge port 802 for cleaning. On the other hand, the drainage pump chamber has a drainage impeller 80b therein, and has a drainage intake port 803 and a drainage discharge port 804 opened to the outside. Although not shown in FIGS. 3 and 4, the drain suction port 803 is connected to the water tank 7 via a hose.
And the discharge outlet 804 for drainage is connected to a drainage groove outside the machine via a hose.

The pump casing 80 is screwed to a motor mounting plate 82 made of metal having both sides bent in an L-shape with screws 84, and the pump motor 81 is also screwed to the motor mounting plate 82 with screws 83. I have. Although not clear from FIGS. 3 and 4, the screws 83 and 84 are screwed to the motor mounting plate 82 at three positions. In this manner, the pump casing 80 and the pump motor 81 are not directly fixed, but are firmly fixed through the motor mounting plate 82. The motor mounting plate 82 has mounting holes at the L-shaped bent portions on both sides thereof, and the boss 22 protrudes vertically downward from the bottom wall 21 of the washing chamber 2.
It is screwed by a screw 86 with a thick cylindrical cushion 87 made of an elastic material such as rubber interposed therebetween. Cushion 87
Prevents the vibration when the pump motor 81 operates from being transmitted to the cleaning chamber 2.

Further, in order to hold the rear side of the pump motor 81 (the side far from the pump casing 80), the lower portion is formed to be curved in an arc shape according to the outer shape of the pump motor 81 as shown in FIG. A motor holding band 85 having both ends bent outward is used. Motor holding belt 85
As shown in FIG. 6, a metal band 851 is fitted into a vibration absorption band 852 made of an elastic body such as rubber and having a U-shaped cross section, whereby the metal body on the outer surface of the pump motor 81 and the metal band 851 are connected. This prevents noise from coming into direct contact. The motor holding band 85 supports and supports the pump motor 81, and is screwed to the boss 22 with screws 86 at the bent portions at both ends in the same manner as the mounting of the motor mounting plate 82. In other words, when the screw 86 is screwed in, the motor holding band 8
5, the pump motor 81 is tightened and held.

As described above, the front side of the pump motor 81 is firmly fixed to the bottom wall 21 of the cleaning chamber 2 via the motor mounting plate 82, and the rear side is clamped and held by the motor holding band 85.

Cleaning outlet 80 of pump casing 80
A flat cylindrical gasket 88 as shown in FIG. 3 and FIG. 7 is inserted into an end of the cylindrical shape, and communicates with an arm base formed at the bottom of the washing chamber 2. Into the substantially cylindrical connecting portion 23. As shown in FIG. 7, an outer peripheral surface and an inner peripheral surface of the gasket 88 are formed with annular irregularities in order to facilitate press-fitting and increase adhesion, and further, the edge is directed toward the inner peripheral side. The fins 881 are bent obliquely. The fins 881 are in an upright state as shown by a dotted line in FIG. 7 before the cleaning discharge port 802 is press-fitted into the connecting portion 23, but are pressed and bent inward when press-fitted, and the restoring force thereof And connecting part 2
3. Strongly adhere to 3. Further, when the cleaning / draining pump 8 performs the cleaning pump operation, water is pressure-fed through the cleaning discharge port 802, and when water pressure is applied, the water further strongly adheres to the connecting portion 23. Thereby, a very high watertightness can be maintained.

Pump casing 80, pump motor 81
When the cleaning and drainage pump 8 including the motor mounting plate 82 is mounted on the bottom of the cleaning chamber 2, the following is performed. First, while the mounting holes of the motor mounting plate 82 into which the cushions 87 are fitted are respectively inserted into the two bosses 22 of the cleaning chamber 2, the cleaning discharge ports 80 into which the gaskets 88 are fitted.
The washing / draining pump 8 is attached to the bottom wall 21 of the washing box 2 so that the pump 2 is pressed into the connecting portion 23 of the washing box 2. In order to perform such fitting at three places, the cleaning / draining pump 8 does not work well if it is inclined with respect to the bottom wall 21 of the cleaning chamber 2. In other words, the mounting that requires the fitting at three places from the same direction enables the
The washing / draining pump 8 approaches the bottom wall 21 while keeping it substantially parallel. Thereby, the gasket 8
The fins 881 are prevented from being turned up in the outer peripheral direction and pressed, and as a result, the water sealing property between the connecting portion 23 and the cleaning outlet 802 can be improved. After fitting the washing and drainage pump 8 as described above, two screws 86 are screwed in, and then the motor holding band 85 is screwed with the screw 86.

Incidentally, in the present dishwasher, not only the mounting structure of the washing and drainage pump 8 but also the arrangement thereof is particularly considered. In the present dishwasher, although the washing and draining pump 8 is firmly fixed to the washing box 2 as described above, the washing and draining pump 8 is started and stopped by the inertia of the pump motor 81 at the time of starting or stopping the drawer / pushing operation. There is a possibility that a large force will be applied to the mounting position of the drainage pump 8. In particular, when the screw 86 is loosened due to long-term use, it is highly likely that a large force is applied to the press-fitted portion between the connecting portion 23 and the cleaning outlet 802.

From the above, in this dishwasher,
As shown in FIG. 4, a straight line C connecting the center of gravity of the pump motor 81, which is a heavy object, and the center of the press-fitting point between the connecting portion 23 and the discharge port 802 for cleaning, the front-back direction of the housing 1, that is, the cleaning chamber The arrangement of each part is determined so that the angle α formed by the straight line D extending in the pull-out / pull-in direction of No. 2 becomes small, specifically, about 20 ° or less. More precisely, if the straight line C and the straight line D are not perfectly parallel,
Since the straight line D can be determined so as to be oblique to the straight line C, an angle formed by the straight lines C and D in a plane including the straight lines C and D is α, and the angle α is set to about 20 ° or less. Good to do.

If the angle α is close to 90 °, a large force in the torsion direction acts on the press-fitting portion due to the inertia force of the pump motor 81 during the pull-out / push-in operation of the cleaning chamber 2, which easily causes deterioration of the gasket 88. On the other hand, if the angle α is reduced as in this dishwasher, the degree of deterioration of the gasket 88 due to the above factors can be suppressed. In addition, according to such an arrangement, a heavy load called the pump motor 81 is disposed behind the washing case 2, so that a large force is applied to the front lower side in a state where the washing case 2 is pulled out. Can be avoided.

The above arrangement also has the following advantages. That is, the extending direction of the motor shaft 81a to which the impellers 80a and 80b are fixed is almost the same as the straight line D extending in the drawing and pushing direction of the washing chamber 2 (that is, substantially parallel).
It has become. Although the pump motor 80 is fixed to the bottom wall 21 of the washing chamber 2 by the screw 86, the cushion 8
7, the pump motor 80 vibrates, though slightly, due to the inertial force and impact caused by the opening and closing of the washing chamber 2 vigorously. This vibration direction is the motor shaft 8
If the angle is orthogonal to or close to 1a, the motor shaft 81a
, A large load is applied to the motor shaft 81a, which tends to cause the motor shaft 81a to tilt or bend. Generally, the motor shaft 81a is formed with very high linearity and dimensional accuracy. Even if the motor shaft 81a is slightly inclined or bent, a frictional sound with a bearing (not shown) holding the motor shaft 81a or the motor shaft 8a is formed.
This may cause frictional noise with a sealing member (not shown) for water-sealing 1a. In contrast, in the structure of this embodiment, even if the pump motor 81 vibrates, the motor shaft 8
The component of the force for inclining or bending 1a is very small, and such deformation can be avoided.

Further, in the present dishwasher, the straight line connecting the two screws 86 screwing the motor mounting plate 82 to the bottom wall 21 of the washing chamber 2 is substantially perpendicular to the straight line D. . Thereby, the inertia generated by the weight of the pump motor 81 at the time of pulling-out and pushing-in operations of the cleaning chamber 2 can be appropriately dispersed and received, so that the cleaning and drainage pump 8 can be firmly fixed.

FIG. 8 is a block diagram of the electric system of the main part of the dishwasher. The control unit 30 mainly includes a microcomputer including a CPU, a ROM, a RAM, a timer, and the like, and executes various controls such as a driving operation based on a control program stored in the ROM. The control unit 30 includes:
An operation unit 32 for the user to give various settings and instructions, and a display unit 3 for the user to monitor the settings and operating conditions
3. A buzzer 34 that sounds when a user's attention is to be raised, a door switch 35 that is turned off or on in response to the opening and closing operation of the door 4, and both are disposed in the water level detection chamber that communicates with the cleaning chamber 2, and An abnormal water level detection switch 36 and a normal water level detection switch 37 that are turned on or off by a float that rises and falls according to the level of water stored in the storage 2, a temperature sensor 38 that detects the temperature of water or air in the cleaning storage 2, and the like. Is connected. A load drive unit 31 is connected to the control unit 30, and controls the operations of the cleaning pump 8 a, the drain pump 8 b, the blower motor 39, the water supply valve 40, and the heater 41 via the load drive unit 31. In the dishwasher, the washing pump 8a and the drain pump 8b are integrated as the washing and drain pump 8 as described above, and either the washing pump operation or the drain pump operation is performed according to the rotational driving direction of the pump motor 81. Is selectively executed.

Another feature of the dishwasher according to the present embodiment resides in an abnormal water level detection process executed by the control unit 30 based on detection signals from the abnormal water level detection switch 36 and the door switch 35. Next, the abnormal water level detection process will be described with reference to the flowchart of FIG.

Even when the power switch (not shown) of the dishwasher is not turned on, the water supply valve 4
There is a possibility that the water supply cannot be stopped due to the failure 0, leading to water leakage. Therefore, this abnormal water level detection process is independent of the power switch on / off,
As long as the power plug of the dishwasher is plugged into a power outlet and commercial AC power is supplied to the machine, the dishwasher is repeatedly executed at all times. Of course, in this state, the drain pump 8b is also connected to the commercial AC power supply,
Even if the power switch is off, if drainage is required as a result of the processing described below, the control unit 30 controls the drainage pump 8
b can be activated.

First, the control unit 30 resets both the built-in abnormal water level detection timer and the door open / close detection timer (step S1). These two timers keep the normal clock time, and start counting from zero again immediately after the reset. Next, it is determined whether or not the abnormal water level detection switch 36 is turned on (step S2). Here, when it is determined whether or not the abnormal water level detection switch 36 is turned on, processing for eliminating the influence of switch chattering, external noise, and the like is executed. Specifically, for example, the on / off state of the abnormal water level detection switch 36 is determined n (for example, 25) times within a predetermined time (for example, 50 msec). It may be determined that the abnormal water level detection switch 36 is ON.

If it is determined in step S2 that the abnormal water level detection switch 36 is off, the abnormality detection timer is reset (step S3), while if it is determined that the abnormal water level detection switch 36 is on. Goes to step S4 as it is (that is, without resetting the abnormal water level detection timer). In step S4, it is determined whether the door switch 35 has changed from on to off or from off to on, and if there has been a change, both the abnormal water level detection timer and the door open / close detection timer are reset (step S5).
When the on / off state of the door switch 35 has changed, it can be determined that it is immediately after the drawer or the push-in of the cleaning cabinet 2 is executed. Thereafter, it is determined whether or not the time of the abnormal water level detection timer has reached 2 seconds (Step S).
6) If the time of the abnormal water level detection timer is less than 2 seconds, the process returns to step S2.

Since the abnormal water level detection timer is reset in both steps S3 and S5, step S2 →
Only when the process proceeds from S4 to S6, the timer of the abnormal water level detection timer should be proceeding without being reset in the middle, and if 2 seconds elapse while repeating S2 → S4 → S6 → S2 →. The process proceeds from S6 to S7. In step S7, it is determined whether or not the time of the door opening / closing detection timer has elapsed 5 seconds. If the time has been 5 seconds or longer, the process proceeds to step S9 to execute an abnormality notification and an abnormality countermeasure process. As the abnormality notification, the buzzer 34 is sounded or the abnormality notification lamp on the display unit 33 is turned on, and as the abnormality countermeasure processing, the drain pump 8b is operated to start draining from the washing chamber 2.

The door open / close detection timer is reset in step S5. Therefore, after the on / off state change of the door switch 35, that is, for 5 seconds immediately after the draw-out or push-in operation of the washing chamber 2, the timer of the abnormal water level detection timer is used. Is longer than 2 seconds, the process proceeds to step S8 without directly proceeding to step S9. In other words, this is not because the water level actually reaches the abnormal water level, but because the abnormal water level detection switch 36 is likely to be in the ON state due to a large undulation accompanying the drawing or pushing operation of the washing chamber 2. .

In step S8, it is determined whether or not the timer of the abnormal water level detection timer has passed 10 seconds.
If the second has not been reached, the process returns to step S2. On the other hand, even if the time of the door opening / closing detection timer is less than 5 seconds, if the time of the abnormal water level detection timer is 10 seconds or more, it is determined that the time is abnormal, and the process proceeds to step S9. This is to prevent the abnormality notification and the abnormal countermeasure process from being performed even if the cleaning chamber 2 is repeatedly pulled out and pushed in a short time in spite of exceeding the abnormal water level. is there.

By the above-described abnormality detection processing, when the operation is temporarily stopped during the washing and rinsing operation and the cleaning cabinet 2 is pulled out or pushed in, the water stored in the cleaning cabinet 2 is greatly wavy. However, the notification and processing corresponding to the abnormal water level are not executed. Therefore, the buzzer 34 sounds even though the water level is not actually abnormal,
Drainage can be prevented from being performed without permission. In addition, except immediately after the drawer / closer of the washing chamber 2,
When the water level in the washing chamber 2 reaches the abnormal water level, the abnormality is immediately notified and the drainage is started. Furthermore, when the drawer / pull-out operation of the cleaning chamber 2 is repeatedly performed in a short time, even if it is immediately after the operation, when the possibility of the abnormal water level is high, the abnormality notification is surely performed and the drainage is performed. Be started. For this reason, it is possible to reliably prevent water from overflowing outside the refrigerator.

The above embodiment is merely an example,
Obviously, changes and modifications can be made within the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic side cross-sectional view of a dishwasher according to an embodiment of the present invention, in which a washing cabinet is housed in a housing.

FIG. 2 is a schematic side sectional view of the dishwasher according to the embodiment in a state where a washing box is drawn out of a housing.

FIG. 3 is a partial side sectional view of a main part showing a detailed configuration near a bottom of a washing cabinet of the dishwasher according to the embodiment.

FIG. 4 is a bottom view showing a detailed configuration around the washing and drainage pump of the dishwasher according to the embodiment.

FIG. 5 is a schematic exploded view showing a method of attaching a pump motor of the dishwasher according to the embodiment.

FIG. 6 is a sectional view taken along the line B-B ′ in FIG. 5;

FIG. 7 is an enlarged view of a portion A in FIG. 4;

FIG. 8 is an electrical configuration diagram of a main part of the dishwasher according to the present embodiment.

FIG. 9 is a flowchart of an abnormal water level detection process in the dishwasher according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Cleaning cabinet 21 ... Bottom wall 22 ... Boss 23 ... Connection part 3 ... Top opening 4 ... Door 6 ... Arm 7 ... Water storage tank 8 ... Cleaning and drainage pump 80 ... Pump casing 801 ... Cleaning suction port 802 ... Discharge port for cleaning 81 ... Pump motor 81a ... Motor shaft 82 ... Motor mounting plate 83,84,86 ... Screw 85 ... Motor holding band 87 ... Cushion 88 ... Gasket 881 ... Fin 10 ... Top cover 30 ... Control unit 31 ... Load drive Unit 33: Display unit 34: Buzzer 35: Door switch 36: Abnormal water level detection switch

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsunori Shinmura 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3B082 BA05 BF02 BF03

Claims (13)

[Claims] 1. A washing box for accommodating tableware, a nozzle for water injection provided inside the washing box, and a water tank attached to an outer surface of the washing box and sucking water stored at a bottom of the washing box. A pump for pressure-feeding the nozzle, wherein a discharge port of the pump is fitted into a communication opening to the nozzle formed in the cleaning chamber, and at least one portion of the pump is connected to the cleaning chamber. A dishwasher characterized by being directly or indirectly fixed to an outer wall surface of a dishwasher. 2. The pump comprises a pump casing having an impeller therein, a pump motor for rotating the impeller, and a mounting plate between the pump casing and the pump motor to which both are fixedly attached. The dishwasher according to claim 1, wherein an attachment plate is fixed to an outer wall surface of the washing box. 3. A pump is fixed to an outer wall surface of a washing chamber at a plurality of locations, and two or more of the fixed directions are substantially the same as a fitting direction of a discharge port of the pump. 3. The dishwasher according to claim 1, wherein the dishwasher is a dishwasher. 4. The dishwasher according to claim 1, wherein a rear side of the pump motor is fastened and held to an outer wall surface of the washing chamber by a band-shaped member. 5. The washing cabinet according to claim 1, wherein the washing cabinet has an opening for taking in and out tableware on an upper surface, and can be pulled out forward from a housing having an open front surface. Dishwasher as described in. 6. The pump is fixed to the outer wall surface of the cleaning chamber at a plurality of locations, and a straight line connecting any two of the locations and a straight line extending in a direction in which the cleaning chamber is drawn out are substantially perpendicular to or close to the straight line. The dishwasher according to claim 5, wherein 7. A washing cabinet having an open front surface, a washing cabinet which can be pulled out from the casing and has an opening at the top for taking in and out tableware, and a water jet provided inside the washing cabinet. A dishwasher comprising: a nozzle for washing and a pump attached to the bottom of the washing box and sucking water stored in the bottom of the washing box and sending it to the nozzle under pressure. The connection between the discharge port of the pump and the washing box The pump is disposed such that a straight line connecting a point and a center of gravity of a pump motor constituting the pump, and a straight line extending in a direction in which the washing chamber is drawn out are parallel or oblique at a small angle to each other. Dishwasher. 8. A washing cabinet having an open front surface, a washing cabinet which can be pulled out forward from the casing and has an opening for taking in and out dishes on the top surface, and a water jet provided inside the washing cabinet. And a pump attached to the bottom of the washing box and sucking water stored at the bottom of the washing box to pump the nozzle to the nozzle, wherein the pump is a pump motor and a motor for the motor. An impeller attached to a shaft and a casing surrounding the impeller are configured, and a straight line extending in a direction in which the motor shaft extends, and a straight line extending in a direction in which the washing box is drawn out,
A dishwasher, wherein the pump motors are arranged parallel or obliquely at a small angle to each other. 9. Tableware stored in a washing cabinet by storing water at the bottom of a washing cabinet that can be pulled out forward from a housing with an open front, sucking the water and jetting the water into the washing cabinet. A) a water level detecting means for detecting a water level of the water stored in the washing chamber; andb) an abnormality determining means for determining whether or not the water level is abnormal based on the detection result of the water level detecting means. C) a draw-out operation or a push-in operation of the washing box from the housing,
Or a recognition unit for recognizing an internal operation related to the operation, wherein the abnormality determination unit changes a criterion for determining an abnormal water level in response to a recognition result by the recognition unit or temporarily performs the determination. Dishwasher characterized in that it is paused. 10. The dishwasher according to claim 9, wherein the recognition unit is a switch unit that is turned on / off in accordance with a draw-out operation and a push-in operation of the washing box. 11. The abnormality determining means suspends the determination of the abnormal water level within a predetermined time after receiving the recognition result by the recognition means, and performs the determination of the abnormal water level after the lapse of the predetermined time. The dishwasher according to claim 9 or 10, wherein: 12. The water level detection means detects that the water stored in the washing chamber has reached a predetermined water level, and the abnormality determination means has an abnormality when the detection result by the water level detection means continues for a predetermined time or more. The dishwasher according to any one of claims 9 to 11, wherein the dishwasher is determined to be at a water level. 13. The water level detection means detects that the water stored in the washing chamber has reached a predetermined water level, and the abnormality determination means has an abnormality when the detection result by the water level detection means continues for a predetermined time or more. 11. The method according to claim 9, wherein the predetermined time is set longer than a predetermined time after a predetermined time has elapsed after receiving the recognition result by the recognition unit after determining that the water level has been reached. dishwasher.