JP3533336B2 - 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 having a control unit arranged in a lower portion of a front portion of a main body.

[0002]

In the conventional dishwasher of this type, the control unit has one wiring board, and the wiring board has a load such as an operating section, a display section, and a washing pump. A control circuit or the like for controlling the

By the way, in this type of dishwasher,
In order to control the pump motor, which is the drive source of the cleaning pump, by an inverter, an inverter circuit and a power supply circuit for the inverter circuit are required. And in such a dishwasher
And the door that opens and closes the opening of the main unit is opened,
Disconnect the washing pump without disconnecting the power supply circuit to the control circuit.
What can be done is desired.

[0004]

[0005] The present onset Ming purposes, if the door is open,
An object of the present invention is to provide a dishwasher with good usability, which can surely turn off the power of the washing pump without cutting off the power supply circuit to the control circuit.

[0006]

Means for Solving the Problems of claims 1 invention, the cleaning in order to achieve the purpose described above <br/>, has an open mouth, the object to be cleaned is accommodated through the opening a body having a bath therein, and a door provided to open and close the opening in the body, door switch to open and close in response to opening and closing of the door
And use the pump motor as a drive source to clean the object to be cleaned.
Cleaning pump and the pump pump for this cleaning pump.
-Equipped with a control circuit that controls the data via an inverter circuit
With a control unit, which is provided in this control unit
Converting alternating current into direct current and using it as the power source of the inverter circuit
Inverter power supply circuit and power supply for the control circuit
And a power supply circuit for control,
Connect the door switch to the power line to the
When the switch is opened, the power supply to the control power circuit is
The power supply to the inverter power supply circuit is not interrupted.
It has a feature in that it is configured to shut off the in .

According to the above-mentioned means, the door is opened and the door is opened.
When the switch opens, the control circuit is ready for operation
The power supply circuit for the inverter and the cleaning pump
The pump motor can be reliably disconnected .

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

In this case, it is preferable that the door switch is connected to an AC line before the inverter power supply circuit (the invention of claim 2 ). When the door switch is provided on the AC line, it is difficult for the door switch to be welded, and it is possible to prevent the switch from being welded and not being cut off.

Further, it is preferable that the reactor is connected to the AC line in the preceding stage of the power supply circuit for the inverter, and the door switch is connected to the preceding stage of the reactor (the invention of claim 3 ). According to this, by providing the door switch in the front stage of the reactor, there is an advantage that the current rating of the load connected to the reactor and the rear stage thereof does not become large and the cost thereof can be prevented from increasing.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 1 and 2, the main body 1 has a configuration in which a cleaning tank 3 is provided inside an outer box 2. An opening 4 is provided on the front of the cleaning tank 3.
A door 5 for opening and closing the opening 4 is attached to the front surface of the main body 1 so as to be rotatable around the lower end as a fulcrum. A door switch 6 that opens and closes in response to opening and closing of the door 5 is provided on the upper portion of the main body 1.

A water supply valve 7 is provided at the back of the cleaning tank 3, a water supply port 8 leading to the inside of the cleaning tank 3 is connected to the water supply valve 7, and a water supply hose 9 is provided outside the cleaning tank 3. Are connected. By connecting the end of the water supply hose 9 to a tap of a water supply (not shown), tap water is supplied into the cleaning tank 3 through the water supply hose 9, the water supply valve 7 and the water supply port 8. Has become.

At the bottom of the cleaning tank 3, a fountain arm 10 having a fountain port 10a is rotatably provided at two left and right positions, and a substantially L-shaped heater 11 is provided on the right side. Further, in the cleaning tank 3, a tableware basket 12 for storing tableware (not shown) as an object to be cleaned is provided with an opening 4
It is designed so that it can be put in and taken out through.
A water storage tank portion 13 projecting downward is provided at a portion of the bottom of the cleaning tank 3 near the front portion, and a residual food filter 14 is detachably attached to the water storage tank portion 13.
As shown in FIG. 3, the water storage tank portion 13 extends in the left-right direction, and has a shape such that the lower portion thereof is recessed further inward and the width thereof is narrower.

Below the cleaning tank 3, a cleaning pump 15 and a drainage pump 16 are arranged rearward of the water storage tank portion 13. In this case, the washing pump 15 and the drainage pump 16 use a common pump motor 17 as a drive source, and when the pump motor 17 rotates forward, the washing pump 15 is activated, and when it rotates in the reverse direction, the drainage pump 16 is activated.
Is enabled. The pump motor 17 is provided with a cooling fan 18. Pump motor 17
Is configured to be inverter-controlled by a control circuit 29 described later via an inverter circuit 32.

The cleaning pump 15 has its suction port communicating with the water storage tank section 13 and its discharge port communicating with both of the fountain arms 10 so that the water sucked from the water storage tank section 13 is fed to both of the fountain arms 10. The tableware stored in the tableware basket 12 is washed by pumping and jetting from the fountain port 10a. Both fountain arms 10 rotate as water is jetted from the fountain port 10a. The drainage pump 16 has a suction port communicating with the bottom of the water storage tank unit 13 and a drainage hose connected to the discharge port, and drains the water sucked from the water storage tank unit 13 through the drainage hose. Below the cleaning tank 3, a blower fan 1 for blowing air into the cleaning tank 3 is provided.
9 (see FIG. 2) is also provided.

On the other hand, a front plate 20 is provided below the front portion of the main body 1, and the control unit 2 is provided on the back side of the front plate 20.
1, a power switch 22 and a smoothing reactor 23 are provided on the right side of the control unit 21. The control unit 21 includes a display / operation unit section 24 on the front side and a power supply / inverter unit section 25 on the rear side.

Of these, a first wiring board 26, which is a printed circuit board, is disposed in the case 24a of the display / operation unit section 24, and the front side of the first wiring board 26 is shown in FIG. As also shown in FIG. 3, an operation unit 27 including a switch, a display unit 28 including an LED, a control circuit 29 including a microcomputer, and a buzzer 30 are provided. A moisture-proof resin is potted in the case 24a.

In the case 25a of the power supply / inverter unit 25, a second wiring board 31 made of a printed board is arranged. This second wiring board 31 is formed to have a length in the left-right direction larger than that of the water storage tank portion 13, and is provided with six power transistors 32, which are power elements, on the back surface of the second wiring board 31. The inverter circuit 33, the radiator 34 common to the six power transistors 32, the inverter power supply circuit 35 that forms the power supply for the inverter circuit 33, the control power supply circuit 36 that forms the power supply for the control circuit 29, and the water supply valve described above. 7 and heater 1
Relays 37a to 37d for controlling the 1 and the like are provided. A moisture-proof resin is also potted inside the case 25a.

The display / operation unit section 24 and the power supply / inverter unit section 25 are arranged so as to be back-to-back, and the jumper lead wire 3 is provided.
8 are connected to each other. The case 25a of the power / inverter unit 25 is integrally provided with a power switch housing 25b and a reactor housing 25c. The power switch 22 and the reactor 23 are housed in the housings 25b and 25c. Has been done. In this case, the control unit 21, the power switch 22, and the reactor 23 are arranged side by side in a line.

Here, the above-mentioned radiator 34 is located below the six power transistors 32 and protrudes rearward from the power transistors 32 in the substantially central portion of the second wiring board 32 in the left-right direction. Is provided. The six power transistors 32 and the radiator 34 are arranged so as to project into the space below the cleaning tank 3 in the lower front portion of the water storage tank portion 13.

The inverter power supply circuit 35 includes a smoothing electrolytic capacitor 39, a rectifying stack 40, a noise filter 41, etc., and is provided on the left side of the second wiring board 32 so as to project rearward. . These electrolytic capacitor 39, rectifying stack 40, noise filter 41
Is a large projecting component with a relatively large amount of rearward projection,
The water tank portion 13 is arranged on the left side so as to project into the space below the cleaning tank 3. Further, among the relays 37a to 37d, the relay 37d for the heater 11 is used.
Is provided on the right side of the second wiring board 32, which is closer to the heater 11, so as to project rearward. This relay 37d is also a large projecting component with a relatively large amount of rearward projection, and the cleaning tank 3 is provided on the right side of the water storage tank unit 13.
Is arranged so as to project into the space below.

In FIG. 4 showing the electrical structure, one power supply line 43a of the power supply plug 42 connected to the power outlet is connected to the input terminal of the inverter power supply circuit 35 through the door switch 6 and the reactor 23 in this order. The other power supply line 43b is connected to the input terminal of the inverter power supply circuit 35 through the power supply switch 22 and the auto power-off switch 44 in this order, and both power supply lines 43a and 43b are AC lines. The inverter power supply circuit 35 converts AC 100V to DC 141V.
The two output terminals are connected to the inverter circuit 33. The three output terminals of the inverter circuit 33 are connected to the pump motor 17 via the energization line 45.

The common connection point between the door switch 6 and the reactor 23 on one power supply line 43a, and the other power supply line 43
A series circuit of the relay switch 46 and the fan motor 19a of the blower fan 19 and a series circuit of the relay switch 47 and the water supply valve 7 are connected in parallel between the auto power-off switch 44 of b. Between the common connection point of the reactor 23 and the input terminal of the inverter power supply circuit 35 and the auto power off switch 44, the relay switch 4 is provided.
A series circuit of 8 and the heater 11 is connected.

The two input terminals of the control power supply circuit 36 for converting alternating current to direct current are one power supply line 43a in the preceding stage of the door switch 6 and an auto power off switch 44 on the other power supply line 43b side. It is connected to a common connection point with the fan motor 19a. This control power supply circuit 3
Reference numeral 6 denotes a power source (DC 5V) of the control circuit 29 and the operation unit 2
7, it is also used as a power source for the display unit 28 and the buzzer 30.

The control circuit 29 receives a signal from the operation section 27 and a signal from the rotational position detector 49 provided on the pump motor 17 via a signal line 50. There is. Then, the control circuit 29
The automatic power-off switch 44 and the fan motor of the blower fan 19 are transmitted through the relays 37a to 37d constituting the drive circuit by the signals from the operating unit 27 and the rotational position detector 49 and the control program provided in advance. 19
It has a function of controlling a, the water supply valve 7, and the heater 11, controlling the pump motor 17 by an inverter via the inverter circuit 33, and controlling the display unit 28 and the buzzer 30.

On the other hand, in FIG. 3, the power supply lines 43a and 43b connected to the second wiring board 31 of the power supply / inverter unit 25, the energization line 45 from the inverter circuit 33 to the pump motor 17, and the rotational position detector. 49
Signal line 50 of the second wiring board 31
It is separated by 0 mm or more and the pulling direction is changed.
Further, the energization line 45 and the signal line 50 are separated and wired by the protrusion 51 provided in the cleaning tank 3.

Next, the operation of the above configuration will be described. When the tableware to be washed is stored in the washing tank 3, the door 5 is closed (the door switch 6 is turned on), the power switch 22 is turned on, and the operation section 27 is operated, the control circuit 29 causes the water supply valve 7 to operate according to the control program. , Heater 11, pump motor 17,
The blower fan 19 is controlled to execute the cleaning operation.

In this case, first, tap water is supplied into the cleaning tank 3 by opening the water supply valve 7, and the tap water is heated by the heater 11 to become hot water. When the cleaning pump 15 is operated by rotating the pump motor 17 in the forward direction, the water in the water storage tank 13 is pressure-fed to both fountain arms 10 and the tableware basket 12 is fed from each fountain port 10a.
The dishes are washed by being sprayed toward the dishes stored in the tableware. When draining after washing,
When the drain pump 15 is operated based on the reverse rotation of the pump motor 17, the drain pump 15 drains the water. Further, when the washed dishes are dried, the heater 11 heats the inside of the cleaning tank 3 and the blower fan 19 blows air into the cleaning tank 3.
Dry the dishes.

If the door 5 is opened during execution of such a cleaning operation, the door switch 6 is turned off, but the control power supply circuit 36 is closer to the power plug 42 than the door switch 6. Since the power supply lines 43a and 43b are connected, the power is not cut off and the control circuit 29 can operate. However, when the door switch 6 connected to the power supply line 43a is turned off, the power supply path to the inverter power supply circuit 35 is cut off, the pump motor 17 is cut off, and the door switch in the power supply lines 43a and 43b is cut off. 6, a water supply valve 7 and a heater 1 that are connected to the latter stage
1. The blower fan 19 is also cut off. Therefore, even if the door 5 is opened during the execution of the cleaning operation, the loads of the pump motor 17 and the water supply valve 7 can be surely cut off. After that, when the door 5 is closed, the cleaning operation is restarted.

The power switch 22 is used for the power line 4
Since it is provided on the side closest to the power plug 42 in 3b, when the power switch 22 is turned off, loads such as the pump motor 17 and the water supply valve 7 are cut off, as well as the control power supply. Since the circuit 36 is also cut off, loads on the control circuit 29 and the like are also cut off.

The following effects can be obtained in the first embodiment described above. First, the control unit 21 provided in the lower portion of the front part of the main body 1 includes a display / operation unit unit 2 including an operation unit 27, a display unit 28, and a control circuit 29.
4, an inverter circuit 33 that controls the pump motor 17 by an inverter, an inverter power supply circuit 35, a control power supply circuit 36, and the like.
The power transistor 32 of the power supply / inverter unit 25 and the radiator 3 are equipped with
4 is provided so as to project in the space below the cleaning tank 3 in the front of the water storage tank 13, and the electrolytic condenser 39, the rectifying stack 40, and the noise filter, which are parts having a relatively large amount of rearward projection. 41 and relay 3
7d is provided so as to project into the space below the cleaning tank 3 on the left and right sides of the water storage tank 13.
By effectively using the space below the cleaning tank 3 as described above, even if the control unit 21 is large, the control unit 21 can be used without increasing the size of the product.
It can be arranged well in the lower part of the front part of the. Moreover, since the control unit 21 is integrated in one place, unlike the case where it is separated into a plurality of parts, it is easy to assemble, is compact, and is not easily affected by noise.

In this case, the relay 37d for the heater 11
Is arranged near the heater 11 on the right end of the second wiring board 31 avoiding the water storage tank portion 13, so that wiring related to the heater 11 can be arranged at a position far from the control unit 21. This makes it possible to shorten the wiring related to the heater 11 and prevent the induction of noise in the heater 11 line. By the way, since the lead wire of the heater 11 is directly connected to the AC power supply lines 43a and 43b,
External noise is liable to be placed on the heater 11 line, and if the heater 11 line is wired near the energization line 45 and the signal line 50 of the pump motor 17, there is a risk that malfunctions such as malfunction may occur due to noise. ,
It is possible to prevent the occurrence of such a defect.

Further, since the power switch 22 and the reactor 23 are housed in the case 25a of the power supply / inverter unit 25 of the control unit 21, they can be handled as one unit. It will be easier to handle and easier to assemble, as well. Also, rather than making individual cases
The cost can be reduced and the number of parts can be reduced.

Moreover, since the display / operation unit 24 and the power / inverter unit 25 are arranged back to back in the control unit 21, the jumper lead wire 38 connecting them can be made as short as possible, and , More compact.

The power supply lines 43a and 43b connected to the second wiring board 31 of the control unit 21, the energization line 45 from the inverter circuit 33 to the pump motor 17 and the signal line 50 of the rotational position detector 49 are In the second wiring board 31, the wiring board 31 is separated by 10 mm or more and the drawing direction is changed, and the energization line 45 and the signal line 50 are separately wired by the protrusion 51 provided in the cleaning tank 3. It is possible to prevent the generation of induced noise from the energization line 45 to the signal line 50 and the power supply lines 43a and 43b as much as possible.

Further, in the above-mentioned embodiment, the door switch 6 is connected to the power supply line 43a in the front stage of the inverter power supply circuit 35 and in the front stage of the blower fan 19, the water supply valve 7, the reactor 23 and the heater 11. At the same time, since the control power supply circuit 36 is connected to the power supply lines 43a and 43b in the preceding stage of the door switch 6, when the door 5 is opened, the control circuit 29 remains in an operable state and the pump motor It is possible to surely disconnect the load such as 17 and the heater 11.

In this case, the door switch 6 is provided with a power supply line 43 which is an AC line in the preceding stage of the inverter power supply circuit 35.
Since the door switch 6 is connected to a, it is difficult for the door switch 6 to be welded, and it is possible to prevent the switch from being welded and not being cut off. In addition, the door switch 6 is the blower fan 1
9, the water supply valve 7, the reactor 23, and the heater 11 are connected to the preceding stages, so that the current rating of the load such as the reactor 23 and the blower fan 19 does not become large, and there is an advantage that their costs can be prevented from increasing. .

FIG. 5 shows a second embodiment of the present invention. This second embodiment differs from the above-mentioned first embodiment in the following points. That is, the reactor 23 is provided on the second wiring board 31 of the power supply / inverter unit section 25 so as to be located on the side of the inverter power supply circuit 35 (left side in FIG. 5). In this case, the lead wire of the reactor 23 can be shortened.

FIG. 6 shows a third embodiment of the present invention. This third embodiment differs from the above-mentioned first and second embodiments in the following points. That is, in the second wiring board 31 of the power supply / inverter unit section 25, the power supply circuit for inverter 35 and the reactor 23 are provided so as to be located on the right side near the power switch 22. In this case, the power switch 22 and the inverter power circuit 35 are close to each other, and it is not necessary to provide the lead wire of the power switch 22 from right to left of the control unit 21, so that noise is less likely to be received. .

FIG. 7 shows a fourth embodiment of the present invention. This fourth embodiment differs from the above-mentioned first embodiment in the following points. That is, the door switch 6 is connected between the relay switch 47 for the water supply valve 7 and the reactor 23 in the one power supply line 43 a.

FIG. 8 shows a fifth embodiment of the present invention. This fifth embodiment differs from the above-mentioned first and fourth embodiments in the following points. That is, the door switch 6 is connected between the reactor 23 and the relay switch 48 for the heater 11 in the one power supply line 43a.

FIG. 9 shows a sixth embodiment of the present invention. This sixth embodiment differs from the above-mentioned first, fourth and fifth embodiments in the following points. That is, in one power supply line 43a, the door switch 6 is connected between the relay switch 48 for the heater 11 and the input terminal of the inverter power supply circuit 35.

The present invention is not limited to the above embodiments, but can be modified or expanded as follows. The cleaning pump 15 and the drainage pump 16 may each use a separate pump motor as a drive source.

[0050]

According to the dishwasher of claim 1, the door is opened.
When released and the door switch is opened, the control circuit can operate
Inverter power supply circuit and then cleaning
The pump motor of the pump can be surely cut off .

[0051]

[0052]

[0053]

According to the dishwasher of the second aspect , since the door switch is provided on the AC line, it is difficult for the door switch to be welded, and it is possible to prevent the switch from being welded and not cut off. According to the dishwasher of claim 3 , by providing the door switch in the front stage of the reactor,
There is an advantage that the current rating of the reactor and the load connected to the subsequent stage does not become large and the cost thereof can be prevented from increasing.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention.

FIG. 2 Cross-sectional view

FIG. 3 is a front view of the positional relationship between the power supply / inverter unit and the water storage tank.

FIG. 4 is a diagram showing an electrical configuration.

FIG. 5 shows a second embodiment of the present invention, and is a view of the power supply / inverter unit portion viewed from the front.

FIG. 6 is a view corresponding to FIG. 5 showing a third embodiment of the present invention.

FIG. 7 is an electrical configuration diagram of a main part showing a fourth embodiment of the present invention.

FIG. 8 is a view corresponding to FIG. 7 showing a fifth embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 7 showing a sixth embodiment of the present invention.

[Explanation of reference numerals] 1 is a main body, 3 is a cleaning tank, 4 is an opening, 5 is a door, 6 is a door switch, 11 is a heater, 12 is a dish basket, 13 is a water storage tank, 15 is a washing pump, 16 is a Drainage pump, 17 pump motor, 21 control unit, 22 power switch, 23 reactor, 24 display / operation unit, 2
4a is a case, 25 is a power supply / inverter unit, 2
5a is a case, 27 is an operation unit, 28 is a display unit, 29 is a control circuit, 32 is a power transistor (power element), 3
3 is an inverter circuit, 34 is a radiator, 35 is an inverter power supply circuit, 36 is a control power supply circuit, 37d is a relay (large protruding part), 39 is an electrolytic capacitor (large protruding part), 40 is a rectifying stack (large protruding part). Parts), 41 is a noise filter (large projecting part), 43a and 43b are power supply lines (AC lines), 45 is an energization line, 49 is a rotational position detector, and 50 is a signal line.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumihiro Imamura 991, Anada-cho, Seto-shi, Aichi Inside the Aichi Plant, Toshiba Corp. (56) References JP-A-10-15278 (JP, A) JP-A-2000-20110 ( JP, A) JP 10-295990 (JP, A) JP 6-105788 (JP, A) Actual development 2-102165 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47L 15/42 A47L 15/46

Claims (3)

(57) [Claims] 1. A has an open mouth, a body of the cleaning tank to be washed are housed with the interior through the opening, a door provided to open and close the opening in the Body A door switch that opens and closes in response to the opening and closing of the door and a pump motor as a driving source are used to clean the object to be cleaned.
Cleaning pump and the pump motor of this cleaning pump with an inverter circuit.
A control unit having a control circuit for controlling through, variable provided in the control unit, the AC to the DC
Inverter power used as a power source for the inverter circuit
A power supply circuit and a control power supply circuit as a power supply for the control circuit,
The door switch is equipped with a power line for the inverter power supply circuit.
Switch and the door switch is opened, the
Do not shut off the power line to the power supply circuit,
A dishwasher characterized in that the power line to the power supply circuit for the computer is cut off . 2. The door switch is in front of the inverter power supply circuit.
The dishwasher according to claim 1, wherein the dishwasher is connected to a multi-stage AC line . 3. An AC line before the power supply circuit for the inverter
Is connected to the reactor, and the door switch is
The dishwasher according to claim 2 , wherein the dishwasher is connected to the front stage .