JP3505473B2 - dishwasher - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishes (including cutting boards and knives).

[0002]

2. Description of the Related Art For example, a domestic dishwasher has a cabinet forming an outer shape, and a washing chamber for washing dishes such as dishes is defined inside the cabinet. An opening for taking in and out dishes is formed on the front surface of the washing room, and an opening / closing door for opening and closing the opening is provided in relation to this opening. In addition, a nozzle for injecting washing water toward the dishes set in the washing chamber is arranged at the bottom of the washing chamber, and the fountain flow from this nozzle removes dirt adhering to the dishes. It is supposed to be.

In the dishwasher having such a structure, it is necessary to surely prevent the washing water from splashing out of the opening of the washing chamber during the washing operation of jetting the washing water to wash the dishes. Therefore, in relation to the opening / closing door, a door switch that is turned on / off according to opening / closing of the opening / closing door is provided,
While the door switch is outputting a detection signal indicating that the open / close door is open, power is supplied to the pump motor that drives the pump for pumping the wash water toward the nozzle under the control of the microcomputer. It is supposed to be forced to stop.

[0004]

For example, for supplying and stopping the electric power to the pump motor, a triac is interposed in series between the pump motor and the power supply (commercial AC power supply), and the triac is turned on / off. Can be controlled by switching with a gate signal from a microcomputer. However, there is a possibility that the power supply to the pump motor cannot be stopped in response to the opening of the opening / closing door only when the microcomputer fails, for example, only by the control by the microcomputer.

Therefore, an object of the present invention is to provide a dishwasher which can favorably stop the power supply to the pump motor in response to the opening of the opening / closing door.

[0006]

[Means for Solving the Problems and Effects of the Invention] The invention according to claim 1 for achieving the above object is from the front.
The width in the front-back direction when viewed is shorter than the width in the left-right direction
Is a thin dishwasher that has been created and forms this thin outline
The cabinet to be divided into
A dishwasher having a washing room, spraying washing water on the dishes housed in the washing chamber, and performing a washing operation for washing the dishes, in association with the opening of the washing chamber,
The upper and lower doors that open and close this opening are installed and closed.
So that the upper end of the lower door overlaps the lower end of the upper door in the assembled state.
The lower door is located in the cleaning room in the closed state.
Lock to engage the fixed part and maintain its closed state
Pieces are provided at both ends in the left-right direction, and the upper door is attached to the upper door at the upper edge.
While holding down the bottom edge of the
Closed state of the lower door by engaging with the specified parts respectively
The upper door is maintained closed.
The left and right sides of the cleaning room
When the lock piece of the
Is equipped with two door switches that are turned off when is released
Is driven by the pump motor and eats wash water.
Cleaning pump for injecting toward the container and the cleaning chamber
And a heater for warming the washing water inside the pump.
The motor has one door switch of the above two door switches.
Connected to the commercial AC power supply in series via
The other one of the above two door switches
It is a dishwasher characterized in that it is connected in series to a commercial AC power supply via . The invention according to claim 2 is the front
The width in the front-back direction when viewed from is shorter than the width in the left-right direction
It is a thin dishwasher that is formed.
The cabinet to be formed and the compartments
And a dishwasher housed in the washing room
Perform a washing operation to spray the washing water and wash the dishes.
A dishwasher to perform, which relates to the opening of the washing room
The upper and lower doors that open and close this opening.
In the closed state, the upper end of the lower door overlaps the lower end of the upper door.
The lower door has the cleaning function in the closed state.
For engaging a predetermined part of the chamber and maintaining its closed state
Lock pieces are provided at both ends in the left-right direction, and the upper edge of the lower door
While pressing the lower edge of the upper door with, wash the left and right lock pieces.
By engaging with the specified parts of the clean room,
The closed state is maintained so that the upper door remains closed.
In relation to the predetermined parts of the washing room,
When the left and right lock pieces engage with the prescribed part, it turns on and
There are two door switches that turn off when the
And is driven by a pump motor and cleaned.
A washing pump for spraying water toward the dishes, and
A water supply valve for controlling the water supply to the washing chamber is provided.
The pump motor is one door switch of the above two door switches.
It is connected to the commercial AC power supply in series via the switch,
The water supply valve is one door switch of the other two door switches.
Switch is connected in series with the commercial AC power supply via the switch.
It is a dishwasher characterized by and.

According to the present invention, when the opening / closing door is opened and the door switch is turned off , the door switch responds to the turning off of the door switch.
Since the power supply to the pump motor is cut off immediately,
There is no risk of washing water spouting outside the washing room.

[0008]

[0009]

[0010]

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view schematically showing the configuration of a dishwasher according to an embodiment of the present invention. This dishwasher is, for example, a thin type in which the width in the front-back direction (the direction perpendicular to the paper surface of FIG. 1) when viewed from the front is shorter than the width in the left-right direction (the left-right direction parallel to the paper surface of FIG. 1). The cabinet 1 has a thin outer shape, and a cleaning chamber 2 defined in the cabinet 1. In front of the washing room 2,
A substantially rectangular opening 21 is formed, and dishes and cutting boards as objects to be cleaned are arranged in a car (not shown), and are put into and taken out of the cleaning chamber 2 through the opening 21 together with the car.

In the cleaning chamber 2, for example, two arm type nozzles 31 and 32 are arranged side by side in the left-right direction below the position where a basket containing dishes or the like is set. When the washing operation of this dishwasher is started, washing water (warm water) is vigorously jetted from the two arm type nozzles 31 and 32, and the stains adhering to dishes or the like due to the jetted washing water. Will be dropped. After the cleaning, warm air is blown into the cleaning chamber 2 by the functions of the blower and the heater, which are not shown in FIG. 1, and the dishes and the like after cleaning are dried.

On the bottom surface of the cleaning chamber 2, there is formed a water collecting portion 22 which is lower than the surroundings. A pump P having a pump motor M as a drive source is connected to the water collecting section 22 via a water sampling pipe 41. The pump P is a washing / drainage pump having a role as a washing pump and a role as a drainage pump. For example, when the pump motor M is rotated in the forward direction, the pump P functions as a washing pump and collects water from the water collecting portion 22. The cleaning water pumped out via 41 is pressure-fed to the arm type nozzles 31, 32 via the water supply pipe 42. on the other hand,
When the pump motor M is rotated in the opposite direction, it functions as a drainage pump, and the wash water pumped from the water collecting section 22 via the water sampling pipe 41 is discharged to the outside of the machine via a drainage pipe (not shown).

The washing water necessary for washing dishes is
Water is supplied into the cleaning chamber 2 from a water supply facility (not shown). In relation to the opening 21 of the washing chamber 2, this opening 21
An upper door 5 and a lower door 6 for opening and closing are attached. The upper door 5 is provided in the vicinity of the upper edge of the opening 21 so as to be rotatable around a rotation axis 51 set substantially parallel to the upper edge. The lower door 6 is provided in the vicinity of the lower edge of the opening 21 so as to be rotatable around a rotation axis 61 set substantially parallel to the lower edge, and the upper end of the lower door 6 is in the closed state. It is designed to overlap the lower end of the.

The lower door 6 is provided with a lock piece (not shown) for engaging with a predetermined portion of the cleaning chamber 2 in the closed state and maintaining the closed state. For example, one lock piece is provided at each of the left and right ends of the lower door 6, and the lower door 6 is engaged with a predetermined portion of each cleaning chamber 2.
By operating the operation member 62 arranged at the central portion of the upper end of the, it is possible to release them almost at the same time. On the other hand, the upper door 5 is not provided with a lock mechanism for maintaining the closed state, and the upper door 5 is first closed and then the lower door 6 is closed. While pressing the lower end edge of the closed upper door 5, the left and right lock pieces disposed on the lower door 6 are engaged with predetermined portions of the cleaning chamber 2, respectively.
The closed state of the lower door 6 is maintained, and the closed state of the upper door 5 is maintained.

A switch 7 for detecting opening / closing of the upper door 5 and the lower door 6 is provided on the periphery of the opening 21 of the cleaning chamber 2.
1, 72, 73 are arranged. The switch 71 is for detecting opening / closing of the upper door 5, and is composed of, for example, a reed switch, and is arranged at the front end portion of the right side surface of the cleaning chamber 2. Correspondingly, a magnet (not shown) is embedded in the upper door 5, and the reed switch 71
Turns on when the inner surface of the upper door 5 contacts the front edge of the cleaning chamber 2, and turns off when the inner surface of the upper door 5 separates from the front edge of the cleaning chamber 2.

The switches 72 and 73 are for detecting the opening and closing of the lower door 6, and are composed of, for example, micro switches, and are associated with predetermined portions with which the left and right lock pieces of the lower door 6 are engaged, respectively. Is provided. Switch 7
2, 73 are turned on when the left and right lock pieces engage with a predetermined portion of the cleaning chamber 2, and are turned off when the engaged state is released. In this embodiment, if any one of the switches 71, 72, 73 is off, the cleaning operation is not started, and the switch 7 is operated during the cleaning operation.
If any one of 1, 2, 73 is turned off, the cleaning operation is immediately stopped. That is, the cleaning operation is not performed when the upper door 5 or the lower door 6 is not completely closed, and the cleaning operation is performed when the upper door 5 or the lower door 6 is not completely closed. Water is prevented from splashing out of the cleaning chamber 2 due to the above-mentioned operation.

FIG. 2 is a block diagram showing the electrical construction of this dishwasher. A pump motor M provided in the dishwasher, an APO (Auto Power Off) 81, a blower 82 for blowing air into the cleaning room 2 (see FIG. 1), and a water supply valve 83 for controlling water supply to the cleaning room 2 , And a heater 84 for warming the cleaning water and the atmosphere in the cleaning chamber 2.
Under the control of the microcomputer 85, the loads such as are operated by an AC voltage (for example, AC 100V) applied in parallel from the commercial AC power supply 86.

Specifically, the pump motor M is connected in series to a commercial AC power source 86 via a triac Tr1 and a switch (lower door right open / closed detection switch) 73, and the triac Tr1 and the switch 73 are also connected.
It is connected in series to the commercial AC power source 86 via a triac Tr2 provided in parallel with. Therefore, the voltage of the commercial AC power supply 86 is applied to the pump motor M when the triac Tr1 and the switch 73 are on or the triac Tr2 is on. For example,
When the triac Tr1 and the switch 73 are turned on, the pump motor M rotates in the forward direction, and the cleaning water in the cleaning chamber 2 is pumped to the arm type nozzles 31, 32. on the other hand,
When the triac Tr2 is on, the pump motor M
Rotates in the opposite direction, and the cleaning water in the cleaning chamber 2 is discharged outside the machine. Even when the triac Tr1 is on, when the lower door 6 (see FIG. 1) is opened and the lower door right open / closed detection switch 73 is turned off, the power supply to the pump motor M is stopped. It

The APO 81 is connected in series with a commercial AC power source 86 via a power switch 74 and a triac Tr3. The APO 81 is activated when the power switch 74 and the triac Tr3 are turned on, and thereafter,
When the operation of the dishwasher is finished, the power switch 74 which is "on" is switched to "off". The blower 82 is connected in series to the commercial AC power source 86 via the power switch 74 and the triac Tr4. When the triac Tr4 is turned on while the power switch 74 is on, the blower 82 is connected to the commercial AC power supply 8
The voltage of 6 is applied, and the air is blown into the cleaning chamber 2.

The water supply valve 83 is for controlling the water supply into the cleaning chamber 2, and is connected to a commercial AC power supply 86 via a power switch 74, a switch (a switch for detecting the lower left opening / closing of the left door) 72 and a triac Tr5. It is connected in series. When the triac Tr5 is turned on / off while the power switch 74 and the switch 72 are turned on, in response to this, the application of the voltage of the commercial AC power source 86 to the water supply valve 83 is started / stopped, and the cleaning chamber 2 is supplied with the voltage. Water supply is started / stopped.

The heater 84 is connected in series with a commercial AC power source 86 via a power switch 74, a switch 72 and a triac Tr6. While the cleaning water is stored in the cleaning chamber 2, the power switch 74, the switch 72
When the triac Tr6 is turned on, the heater 84
The voltage of the commercial AC power supply 86 is applied to the heater 84
The washing water in the washing chamber 2 is warmed by the heat generated by. Further, when the triac Tr6 is turned on in a state where the blower 82 blows air into the cleaning chamber 2 and the switch 72 is turned on, the heater 84 is connected to the commercial AC power supply 8
A voltage of 6 is applied, and the heat generated by the heater 84 warms the air blown into the cleaning chamber 2 (the atmosphere in the cleaning chamber 2). Therefore, by operating the blower 82 and the heater 84 after cleaning and causing the hot air to convection in the cleaning chamber 2, it is possible to dry the wet dishes after cleaning.

A transformer 87 for reducing the voltage of the commercial AC power source 86 is also connected to the commercial AC power source 86. A power supply circuit 88 for converting the voltage stepped down by the transformer 87 into a stable DC voltage is connected to the transformer 87, and the voltage of the commercial AC power supply 86 is stepped down by the transformer 87 and then supplied to the power supply circuit. It is converted to a stable DC voltage (for example, DC5V) of a stable level at 88 and used as an operating voltage of the microcomputer 85.

The microcomputer 85 includes a CPU and R
It is composed of a memory including an AM and a ROM.
The microcomputer 85 includes, for example, an oscillator circuit 91 including a crystal oscillator, and the microcomputer 8
A pulse from the reset circuit 92 for returning the value of the counter in 5 to the initial value is input.
Further, the output signal of the thermistor 931 that detects the temperature in the cleaning chamber 2 is input to the microcomputer 85 via the thermistor input circuit 93. Thermistor 93
1 is disposed on the bottom surface of the cleaning chamber 2, for example.

The microcomputer 85 is also connected to detection circuits 94 to 99 for detecting the on / off states of the switches 71 to 76 arranged in each part of the dishwasher. Specifically, the upper door switch (SW) detection circuit 94,
The lower door left switch detection circuit 95, the lower door right switch detection circuit 96, and the power switch detection circuit 97 respectively include an upper door open / close detection switch 71 and a lower door left open / close detection switch 7.
2, a circuit for detecting ON / OFF of the lower door right open / closed detection switch 73 and the power switch 74, and the detection signals of these detection circuits 94 to 97 are input to the microcomputer 85. A water level switch (SW) detection circuit 98 detects ON / OFF of a water level switch 75 for detecting a constant water level in the cleaning chamber 2 and an abnormal water level switch 76 for detecting an abnormal water level higher than the constant water level. This is a circuit, and the detection signal of the water level switch detection circuit 98 is also input to the microcomputer 85. Furthermore, the push switch (SW) detection circuit 99 is
For example, push switches 78 including a start switch (key) for instructing the start of operation of this dishwasher and a course selection switch (key) for selecting one course from a plurality of prepared driving courses. Is a circuit for detecting the on / off state of the switch, and the detection signal of the push switch detection circuit 99 is also input to the microcomputer 85.

A load drive circuit 101 for controlling on / off of the triacs Tr1 to Tr6 is further connected to the microcomputer 85. The microcomputer 85 outputs a control signal to the load drive circuit 101 based on the above-mentioned input signals to control the on / off of the triacs Tr1 to Tr6, whereby the pump motor M, the APO 81, the blower 82, and the water supply valve 83. And the operation of loads such as the heater 84. In addition, the microcomputer 85 includes, for example, an LED for displaying a cleaning operation course selected by the user and a display including a 7-segment display for displaying a two-digit number indicating the remaining time of the cleaning operation. A display circuit 103 for controlling the equipment 102 and a buzzer circuit 105 for controlling the buzzer 104 are connected, and the microcomputer 85 uses the display circuit 103 and the buzzer circuit 105 based on the above-mentioned input signals. Give a control signal to.

The push switches 78 and the indicators 102 are, for example, the cabinet 1 (see FIG. 1).
Is disposed below the lower door 6 on the front side of the. FIG. 3 is a circuit diagram showing a power supply circuit for rotating the pump motor M in the forward direction and a lower door right switch detection circuit 96. The power supply circuit for rotating the pump motor M in the forward direction includes a lower door right open / closed detection switch 73, a triac Tr1 and a commercial AC power source 86 which are connected in series to the pump motor M.
It is composed of.

With this configuration, even if the triac Tr1 is not turned off even when the lower door 6 is opened due to a failure of the microcomputer 85 or the like, the lower door right open / close detection switch 73 is operated. In response to the turning off, the power supply to the pump motor M is immediately cut off. Therefore, there is no fear that the cleaning water will spout out of the cleaning chamber 2. The lower door right switch detection circuit 96 includes a series circuit of a resistor R1 and a diode D1. In this series circuit, the resistor R1 is connected to the wiring 111 between the lower door right open / close detection switch 73 and the triac Tr1, and the diode D1 is connected to the commercial AC power source 86.
It is provided in parallel with the triac Tr1 by being connected to the wiring 112 between the transformer 87 and the transformer 87. The diode D1 is provided so as to pass a current flowing from the resistor R1 toward the wiring 112.

The lower door right switch detection circuit 96 also includes a circuit including a diode D2 and resistors R2 and R3. This circuit is configured by connecting a diode D2 and a resistor R2 in series, connecting one end of a resistor R3 to a wiring 113 between the diode D2 and the resistor R2, and grounding the other end of the resistor R3. Has been done. Then, the diode D2 is the wiring 1 between the resistor R1 and the diode D1.
14, the resistor R3 is connected to the microcomputer 85.
(See FIG. 2). The diode D2 is provided so as to pass a current flowing from the wiring 114 toward the resistor R2.

According to this structure, when both the triac Tr1 and the lower door right open / closed detection switch 73 are off, no current flows in the series circuit of the resistor R1 and the diode D1. Therefore, the lower door right switch detection circuit 96 is provided. Therefore, no detection current is applied to the microcomputer 85. Hereinafter, the state in which the detection current is not applied to the microcomputer 85 is referred to as the state in which the L (low) level detection signal is input to the microcomputer 85.

Also, the triac Tr1 is off,
When the lower door right opening / closing detection switch 73 is turned on, FIG.
The equivalent circuit of the circuit shown in FIG. 4 is as shown in FIG. 4, and only when the current flows from the commercial AC power source 86 to the pump motor M, the resistor R1 and the diode D1 in this order, the lower door right switch detection circuit 96 detects the microcomputer 85. An electric current is given. That is, the H (high) level detection signal is input to the microcomputer 85 from the lower door right switch detection circuit 96 at each timing corresponding to the cycle of the AC current from the commercial AC power supply 86.

Further, when the triac Tr1 is on and the lower door right open / closed detection switch 73 is off,
The equivalent circuit of the circuit shown in FIG. 3 is as shown in FIG. Also,
TRIAC Tr1 and lower door right open detection switch 7
When both 3 are on, the equivalent circuit of the circuit shown in FIG. 3 is as shown in FIG. Therefore, in these cases, a current always flows in the series circuit of the resistor R1 and the diode D1, and the detection current is always supplied from the lower door right switch detection circuit 96 to the microcomputer 85. That is, the microcomputer 85 includes the lower door right switch detection circuit 9
The detection signal of H level from 6 is continuously input.

Therefore, the microcomputer 85 is
When the triac Tr1 is off, it can be determined whether the lower door right open / closed detection switch 73 is on or off based on the detection signal input from the lower door right switch detection circuit 96. However, the triac Tr1 is turned on. In the case of, it cannot be determined well whether the lower door right open / closed detection switch 73 is on or off. If it cannot be determined whether the lower door right open / close detection switch 73 is ON / OFF, the lower door right is detected during the cleaning operation (cleaning process and rinsing process) performed by driving both the pump motor M and the heater 84 (see FIG. 2). Even if the pump motor M is stopped in response to the opening / closing detection switch 73 being turned off, the power supply to the heater 84 is continued according to a predetermined operation program. When the pump motor M is stopped, the cleaning water in the cleaning chamber 2 does not circulate and stays at the bottom. Therefore, if the heater 84 is continuously energized in this state, the cleaning water near the heater 84 becomes abnormal. May be heated to high temperature.

Therefore, in this embodiment, the microcomputer 85 executes the switch determination processing described below. By this switch determination processing, it is possible to satisfactorily determine whether the lower door right opening / closing detection switch 73 is on / off regardless of whether the triac Tr1 is on / off, and the lower door right opening / closing detection switch 73 is off during the washing operation. Even if it becomes, it is possible to prevent the wash water from being abnormally heated and reaching a high temperature.

FIGS. 7, 8 and 9 are flow charts showing the flow of the switch determination processing. The switch determination process is started in response to the start switch included in the push switches 78 (see FIG. 2) being pressed and an instruction to start operation of the dishwasher being issued (YES in step S1 in FIG. 7). ). When the start switch is pressed,
First, the value of the continuous operation time counter for measuring the continuous operation time of the dishwasher is cleared to zero (step S
2). The continuous operation time counter is provided in the RAM included in the microcomputer 85, for example.
Next, whether or not the cleaning operation is being executed, in other words,
It is determined whether or not the cleaning process or the rinsing process is being performed (step S3). The cleaning process is a process for spraying cleaning water containing detergent onto dishes to remove stains adhering to the dishes. The rinsing step is a step of spraying cleaning water containing no detergent onto the tableware after the cleaning step to flush the detergent adhering to the tableware.

Processes other than the cleaning process and the rinsing process (water supply process for supplying cleaning water into the cleaning chamber 2, drainage process for draining cleaning water in the cleaning chamber 2 or drying process for drying dishes wet with cleaning water) ) Is being executed (NO in step S3), the operation process for the process being executed is continued (step S4). When the process being executed is completed (YES in step S5), whether or not the final process (for example, the drying process) of the operation course selected and set by operating the course selection switch included in the push switches 78 has been completed. It is determined (step S6). If the final process is not completed, after the switching process to the next process is performed (step S7), the process returns to step S3 to determine whether the next process is a cleaning process or a rinsing process. Will be judged again.

On the other hand, if the cleaning process or the rinsing process is being executed (YES in step S3), the continuous operation time counter starts counting (step S8 in FIG. 8).
Thereafter, it is determined whether or not the value of the continuous operation time counter has reached a value corresponding to 30 seconds (step S9). If the determination is negative, the microcomputer 85
It is checked whether or not "1" is set in the door detection flag provided in the RAM included in the RAM (step S12). This door detection flag is a flag indicating whether or not steps S15 to S21 for detecting ON / OFF of the lower door right open / closed detection switch 73 (opening / closing of the lower door 6) are executed, and this switch determination processing is performed. Has been reset to zero at the start of.

When the door detection flag is not set to "1", the values of the ON determination time counter and the determination time counter used for determining ON / OFF of the lower door right opening / closing detection switch 73 are zero. Is cleared (steps S13 and S14), and steps S15 to S21 for detecting ON / OFF of the lower door right open / closed detection switch 73 are not performed. After that, the operation process related to the cleaning process or the rinsing process is performed (step S22), and if the cleaning process or the rinsing process is not completed yet (N in step S23).
O), returning to step S3 of FIG. 7, it is determined again whether the cleaning process or the rinsing process is being performed. At this time, the determination as to whether the cleaning process or the rinsing process is being performed is naturally denied, and the process proceeds to step S8 in FIG.
The count of the continuous operation time counter is advanced.

Both the ON determination time counter and the determination time counter are provided, for example, in the RAM included in the microcomputer 85. In this way, the count of the continuous operation time counter is advanced, and when the value of the continuous operation time counter reaches a value corresponding to 30 seconds (YES in step S9), the value of the continuous operation time counter is cleared to zero and ( Step S10),
The door detection flag is set to "1" (step S
11). Next, it is checked whether or not the door detection flag is set to "1" (step S12). At this time, since the door detection flag is set to "1", the determination whether the door detection flag is set to "1" is affirmative, and the lower door right open / closed detection switch 7
Steps S15 to S21 for detecting ON / OFF of No. 3 are started.

First, the triac Tr1 connected to the pump motor M is turned off, and the pump motor M is stopped (off) (step S15). Then, it is checked whether or not the detection signal (switch detection signal) input from the lower door right switch detection circuit 96 is the H level signal (step S16). When the triac Tr1 is off and the lower door right open / closed detection switch 73 is on, the microcomputer 85 receives an H level switch detection signal from the lower door right switch detection circuit 96 as an alternating current from the commercial alternating current power supply 86. Every timing according to the cycle of
20 when the AC frequency of the commercial AC power supply 86 is 50 Hz
every msec). On the other hand, when the lower door right open / close detection switch 73 is off, the switch detection signal input from the lower door right switch detection circuit 96 to the microcomputer 85 is always at the L level.

If the switch detection signal is at the H level (YES in step S16), the counting of the ON determination time counter is started (step S17). Then, it is determined whether or not the value of the ON determination time counter is equal to or greater than the value corresponding to 40 msec (step S18), and if the determination is negative, the counting of the determination time counter is started next. (Step S19). Then, it is determined whether or not the value of the determination time counter is equal to or greater than the value corresponding to 100 msec (step S20). At this time,
Since it is immediately after the counting of the determination time counter is started, the determination is negative if the value of the determination time counter is equal to or greater than the value corresponding to 100 msec, and the process returns to step S3 of FIG. It is again determined whether the process is being executed. If the determination as to whether the cleaning process or the rinsing process is being performed is denied, the process in FIG.
In step S8, the count of the continuous operation time counter is newly started. Immediately after the continuous operation time counter starts counting, the value of the continuous operation time counter has not reached the value corresponding to 30 seconds (N in step S9).
O), and then it is checked whether or not the door detection flag is set to "1" (step S12). Since the door detection flag is still set to "1" and not reset, the determination as to whether the door detection flag is set to "1" is affirmative, and the triac Tr1
With the switch turned off, it is checked again whether or not the switch detection signal is at the H level (step S16).

Thus, while the switch detection signal is at the H level, steps S16 → S17 → S18 → S19 →
The routine of S20 → S3 → S8 → S9 → S12 → S15 → S16 is repeated, and the count of the ON determination time counter is advanced. Then, when the switch detection signal is switched from the H level to the L level while this process is repeated (NO in step S16), thereafter, while the switch detection signal is at the L level, steps S16 → S19 →
The routine of S20 → S3 → S8 → S9 → S12 → S15 → S16 is repeated, and the count of the ON determination time counter is not advanced, but only the determination time counter is advanced. After that, the switch detection signal changes from L level to H
When returning to the level, steps S16 → S17 → S18 are performed again.
→ S19 → S20 → S3 → S8 → S9 → S12 → S15
→ The routine of S16 is repeated and the count of the ON determination time counter is advanced.

For example, when the AC frequency of the commercial AC power supply 86 is 50 Hz, the switch detection signal input from the lower door right switch detection circuit 96 to the microcomputer 85 switches between H level and L level every 10 msec. Therefore, when the count of the ON determination time counter advances and the value of the ON determination time counter becomes equal to or greater than the value corresponding to 40 msec (YES in step S18),
The H-level switch detection signal is input to the microcomputer 85 at least four times, and in this case, the lower door right open / closed detection switch 73 is determined to be ON. When it is determined that the lower door right open / closed detection switch 73 is ON, the door detection flag is reset to zero (step S21). Then, the triac Tr1 is turned on,
The drive of the pump motor M is restarted, and the process relating to the cleaning process or the rinsing process is executed (step S2).
2). After that, it is judged whether or not the cleaning process or the rinsing process is completed (step S23), and if it is completed, a switching process to the next process is performed (step S2).
4) If not finished yet, skip step S24 and return to step S3 of FIG.
The processes after 3 are performed.

On the other hand, the value of the ON determination time counter is 40 m
When the value of the determination time counter reaches the value corresponding to 100 msec before reaching the value corresponding to sec (step S20), the lower door right open / closed detection switch 73 is determined to be off, and the door detection is performed. After the middle flag is reset to zero (step S25), a process for temporarily stopping the cleaning operation is performed (step S26). In this washing operation suspension process, for example, the triac Tr
1 is left off and TRIAC Tr6
(See FIG. 2) is turned off, and the power supply to the heater 84 is stopped. As a result, it is possible to prevent the cleaning water accumulated at the bottom of the cleaning chamber 2 from being abnormally heated to a high temperature due to the stop of the pump motor M.

After the cleaning operation is temporarily stopped, for example, a character such as "OP" is displayed blinking on the 7-segment display included in the display device 102 shown in FIG. 2 and the buzzer 104 shown in FIG. Is operated for a certain period of time, for example, a process for notifying that the lower door 6 is open (door open notification) is performed (step S27). After that, when the user who notices the door open notification closes the lower door 6 and presses the start switch (YES in step S28), the 7-segment display is used to display the remaining time of the temporarily stopped driving course. After processing is performed (step S2
9), returning to step S3 of FIG.
Subsequent processing is performed. Then, when the final process of the series of driving courses ends (YES in step S6), the switch determination process ends.

As described above, in this switch determination processing,
During the cleaning operation, the triac Tr1 is turned off every 30 seconds, and while the triac Tr1 is off, based on the switch detection signal output from the lower door right switch detection circuit 96, the lower door right open / closed detection switch 73 ON / OFF is determined. Accordingly, it is possible to favorably determine whether the lower door right open / closed detection switch 73 is turned on or off even during the washing operation. When it is determined that the lower door right open / closed detection switch 73 is off during the washing operation,
Since the power supply to the heater 84 is stopped, the pump motor M
It is possible to prevent the cleaning water accumulated at the bottom of the cleaning chamber 2 from being abnormally heated and reaching a high temperature due to the stop.

In this embodiment, the triac T
While r1 is off, the lower door right switch detection circuit 96 outputs H
When the total time during which the level switch detection signal is output reaches 40 msec, it is determined that the lower door right opening / closing detection switch 73 is ON, but 40 msec.
The numerical value (ON determination threshold value) is an example, and may be appropriately changed based on the AC frequency of the commercial AC power supply 86. However, the ON determination threshold value is preferably set shorter than the threshold value (100 msec in this embodiment) when it is determined that the lower door right opening / closing detection switch 73 is OFF. By doing so, the time for turning off the triac Tr1 and stopping the pump motor M during the cleaning operation can be shortened.

Further, for example, the number of times the switch detection signal is switched between the H level and the L level while the triac Tr1 is off is counted, and when the count reaches a predetermined number or more, the lower door right open / closed detection is detected. Switch 7
It may be determined that 3 is on. In this case, in order to prevent erroneous determination due to the influence of noise, it is preferable that the predetermined number of times is two or more. Furthermore, in this embodiment, during the cleaning operation, the triac Tr
1 is turned off every 30 seconds, but the triac Tr is not limited to 30 seconds, and is set at a predetermined time shorter than 30 seconds.
1 may be turned off, or the triac Tr1 may be turned off every predetermined time longer than 30 seconds.

Further, the present invention is not limited to the above-mentioned embodiment, but can be implemented in other forms. For example, in the above-described embodiment, the lower door right open / closed detection switch 73 is provided in series between the pump motor M and the triac Tr1, but the pump motor M and the triac T1 are connected in series.
The lower door left open / closed detection switch 72 may be provided in series with r1. In the above-described embodiment, by closing the upper door 5 and then the lower door 6, the opening 21 of the cleaning chamber 2 is closed, and by opening the lower door 6 and then the upper door 5, the cleaning chamber is opened. Although the configuration in which the opening 21 of 2 is opened is taken as an example, the opening 21 of the cleaning chamber 2 is closed by closing the upper door 5 after closing the lower door 6, and the lower door is opened after opening the upper door 5. The opening 21 of the cleaning chamber 2 may be opened by opening 6. In this case, the upper door opening / closing detection switch 71 for detecting the opening / closing of the upper door 5 to be opened first may be interposed in series between the pump motor M and the triac Tr1.

Furthermore, in the above embodiment, the thin dishwasher has been described as an example, but the present invention may be applied to a dishwasher having a substantially square outer shape in plan view. In addition, various design changes can be made within the scope of the matters described in the claims.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a configuration of a dishwasher according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the dishwasher shown in FIG.

FIG. 3 is a circuit diagram showing a power supply circuit and a lower door right switch detection circuit for rotating the pump motor in a forward direction.

FIG. 4 is an equivalent circuit of the circuit shown in FIG. 3 when the triac is off and the lower door right open / closed detection switch is on.

5 is an equivalent circuit of the circuit shown in FIG. 3 when the triac is on and the lower door right open / closed detection switch is off.

FIG. 6 is an equivalent circuit of the circuit shown in FIG. 3 when both the triac and the lower door right open / closed detection switch are on.

FIG. 7 is a flowchart showing a flow of switch determination processing.

FIG. 8 is a flowchart showing a flow of switch determination processing.

FIG. 9 is a flowchart showing a flow of a switch determination process.

[Explanation of symbols]

2 Washing room 5 Upper door (open / close door) 6 Lower door (open / close door) 21 Opening 73 Lower door right open / closed detection switch (door switch) 85 Microcomputer (determination means, elapsed time measurement means, level determination means, on-time measurement) Means, OFF means, drive restarting means) 96 lower door right switch detection circuit (switch detection circuit) 111 wiring (wiring between switching element and door switch) M pump motor (driving source) P cleaning pump Tr1 triac (switching element) )

─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenji Yamane 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Takayoshi Akagi 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 within Sanyo Electric Co., Ltd. (56) Reference JP-A-9-164102 (JP, A) JP-A-2000-22011 (JP, A) JP-A-11-290260 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47L 15/46 A47L 15/42

Claims (2)

(57) [Claims] 1. The width in the front-rear direction when viewed from the front is left-right
It is a thin dishwasher that is shorter than its width.
This cabinet that forms this thin outline and this cabinet
A dishwasher having a washing room partitioned in the net, spraying washing water to the dishes housed in the washing chamber, and performing a washing operation to wash the dishes, the opening of the washing chamber Relatedly, the top door that opens and closes this opening
And the lower door is attached and closed, the upper end of the lower door
Overlaps the lower end of the upper door, and the lower door is engaged with a predetermined portion of the cleaning chamber in the closed state.
Lock piece to maintain the closed state.
Are provided at both ends of the upper door, and the lower edge of the upper door is pushed by the upper edge of the lower door.
The left and right lock pieces to the designated parts of the washing chamber.
By engaging each of them, the closed state of the lower door is maintained.
The upper door is maintained in the closed state , and the left and right locks are respectively associated with the predetermined parts of the cleaning chamber.
It turns on when the piece engages the predetermined part, and the engagement is released.
If there are two door switches that turn off when
Both are driven by the pump motor and spray the washing water toward the dishes.
And a washing pump for warming the washing water in the washing chamber.
A heater for storing the pump motor , and the pump motor is one door of the two door switches.
Connected to a commercial AC power supply in series via a switch
The heater is connected to the other door switch of the two door switches.
A dishwasher characterized by being connected in series to a commercial AC power source via an switch . 2. The width in the front-rear direction when viewed from the front is left-right.
It is a thin dishwasher that is shorter than its width.
This cabinet that forms this thin outline and this cabinet
It has a cleaning room partitioned in the net, and in the cleaning room
Cleaning the dishes by spraying wash water on the stored dishes
A dishwasher for performing a washing operation to be performed, wherein an upper door that opens and closes an opening of the washing chamber in relation to the opening.
And the lower door is attached and closed, the upper end of the lower door
Overlaps the lower end of the upper door, and the lower door is engaged with a predetermined portion of the cleaning chamber in the closed state.
Lock piece to maintain the closed state.
Are provided at both ends of the upper door, and the lower edge of the upper door is pushed by the upper edge of the lower door.
The left and right lock pieces to the designated parts of the washing chamber.
By engaging each of them, the closed state of the lower door is maintained.
The upper door is maintained in the closed state , and the left and right locks are respectively associated with the predetermined parts of the cleaning chamber.
It turns on when the piece engages the predetermined part, and the engagement is released.
If there are two door switches that turn off when
Both are driven by the pump motor and spray the washing water toward the dishes.
Controls the cleaning pump for supplying water and the water supply to the cleaning chamber
And a water supply valve for operating the pump motor , wherein the pump motor is one door of the two door switches.
Connected to a commercial AC power supply in series via a switch
The water supply valve is the other one door switch of the two door switches.
Tableware washing machine you characterized and this <br/> connected in series to a commercial AC power source through a switch.