JP3488168B2 - Dishwasher cleaning equipment - 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 washing device, and more particularly, to a washing pump controlled via an inverter.

[0002]

2. Description of the Related Art A washing tub of a dishwasher is provided with a plurality of nozzles for injecting pressurized water in order to automatically wash dishes contained therein. The nozzle includes a fixed nozzle and a rotary nozzle, and a planetary rotary nozzle that revolves around its axis while revolving is also known (JP-A-5-16858).
(See Japanese Patent Publication No. 1).

In any of the above types, a washing pump for supplying pressurized washing water to the nozzle is used, and an AC induction motor is used as the pump motor. The pump motor is directly driven by a commercial power source and injects cleaning water with a constant pump capacity.

[0004]

However, the above-mentioned conventional cleaning device has the following problems. Since the fixed nozzle has a constant jet water trajectory, it is necessary to arrange a large number of nozzles in the washing tank to spread the jet water flow to the dishes in the washing tank, and therefore, it is necessary to considerably increase the pumping capacity. There is. The rotary nozzle requires water to obtain the driving force for rotation. Since this water is water that does not contribute to cleaning, it is inefficient, and it is necessary to take measures against water leakage from the rotary support portion, and the structure is complicated. Even if the nozzle is rotated, the rotation locus is constant, so it is difficult to uniformly spread the wash water to all dishes. The planetary rotary nozzle has a complicated structure, which increases the cost of the product. In any of the above formats, the pump capacity is set based on the time when the tableware is full, so that when the tableware is small, it is washed with more capacity than necessary, resulting in a waste of electric power. Also, the impact sound of water becomes loud and causes noise. When the upper and lower two-tier dish baskets are installed in the washing tank, even if only the upper dish baskets are placed for washing, the washing is performed with a predetermined set capacity, resulting in a waste of electric power.

Therefore, an object of the present invention is to provide a washing device for a dishwasher which solves these problems by adopting a washing type different from the conventional type.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a required number of nozzles facing a cleaning tank,
A washing pump for supplying washing water to the nozzle, a power source device for the washing pump, and a washing device for a dishwasher including a control device, wherein the power source device is a commercial power source, and a rectifier that rectifies its AC power, and It is composed of an inverter for converting DC power rectified by a rectifier into AC power, and the control device controls the AC power converted by the inverter, and the AC motor drives the pump motor of the cleaning pump. It is a thing.

The pumping capacity of the pump motor can be controlled by appropriately changing the magnitude and frequency of the AC power converted by the above inverter through the control device. As a result, the spray angle and spray distance of the wash water sprayed from the nozzles are changed, and the wash water is spread over the dishes in the wash tank.

The control by the control device may control the frequency of the AC power, and the pump motor may be an AC induction motor. Since the rotation speed of the AC induction motor is proportional to the frequency, the rotation speed of the cleaning pump can be changed by controlling the frequency of the AC power applied to this.

The above nozzle may be of a fixed type, a rotary type, or a combination type of both.

The control device controls the pump motor in a high-speed rotation mode in the cleaning process and in a low-speed rotation mode in the rinsing process, and controls the pump motor in a random mode in which the rotation speed changes randomly. The control device is provided with means for inputting a signal for discriminating the amount of dishes in the washing tank, and the control mode of the motor is changed according to the amount of dishes, and the control device is provided with two upper and lower dishes baskets in the washing tank. By providing a means for inputting a determination signal for determining the presence or absence of tableware, it is possible to perform control such as whether the tableware basket is upper or lower, or the control mode of the pump motor is changed according to the presence or absence of tableware. The cleaning effect can be improved, power consumption can be reduced, and noise caused by cleaning can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the cleaning apparatus of the embodiment has a required number of fixed nozzles 2 facing a cleaning tank 1. An arcuate surface 3 having an appropriate curvature is formed on the inner surface of each nozzle 2, and the direction of washing water is determined according to the arcuate surface 3. The arrow a conceptually shows the injection direction of the washing pump 4 in the high speed rotation mode, and the arrow b conceptually shows the injection direction in the low speed rotation mode.

The washing pump 4 is connected to the nozzle 2 through a water supply passage 5. The cleaning pump 4 is driven by a pump motor 6. The pump motor 6 is composed of an AC induction motor and is driven by the power supply device 7 controlled by the control device 8. A microcomputer is mounted on the control device 8, and a required command is given by an input signal from a command means 9 such as a switch or a sensor from the outside or an internal program.

The power supply device 7 is a commercial power supply 10, a rectifier 11 for rectifying the AC power, and a rectifier 11 for the rectifier 11.
The inverter 12 further converts the DC power rectified by the AC power into AC power. The frequency of the AC power output from the inverter 12 is controlled by the controller 8.

Since the cleaning apparatus of the embodiment is configured as described above, the AC power having the frequency according to the command content from the command means 9 is applied to the pump motor 6. As a result, the number of rotations of the pump motor 6 changes according to the command content, and the water pressure and the amount of the wash water injected from the nozzle 2 change.

As is well known, since the rotation speed of the AC induction motor changes in proportion to the frequency, the pump motor 6 is driven in the high speed rotation mode when a high frequency is commanded. As a result, the cleaning water sprayed from the nozzle 2 through the cleaning pump 4 is sprayed at a relatively large angle as shown by the arrow a, and the spray distance is long. On the contrary, when the low frequency is commanded, the pump motor 6 is driven in the low speed rotation mode, and the cleaning water is sprayed at a relatively small angle as shown by the arrow b,
The injection distance is also short.

The above frequency is shown in FIG.
On the other hand, when the control is performed in a random mode in which the pump motor 6 is randomly changed, the rotation speed N of the pump motor 6 is changed randomly, so that the injection angle and the injection distance can be widely changed over time.

The dishwashing process is divided into a washing process and a subsequent rinsing process. Depending on the control program, as shown in FIG. 3, in the case of the "washing process", the high-speed rotation mode in which the frequency is set high is used. The pump motor 6 is driven, and in the case of the "rinsing step", the pump motor 6 is driven in the low speed rotation mode in which the frequency is set low. Each mode can be a random mode, which is shown by the broken line in the figure.

Similar to the above control, the control of distinguishing the high speed rotation mode from the low speed rotation mode and further adding the random mode is also applied to the case where the control mode is changed according to the amount of dishes put in the washing tank. It That is, the amount of tableware is discriminated by an external command from a switch, a weight sensor, etc., and the control mode is switched to "more tableware" and "less tableware" as shown in FIG.

Similarly, when the tableware baskets are provided in the upper and lower two stages, it is instructed from the outside by the switch that the tableware baskets are placed only in the tableware baskets farther from the nozzle 2 (for example, the upper tableware basket) and the weight. Determined by sensors, etc., as shown in Fig. 3, "upper car used" and "upper car not used"
Switch the control mode as shown in.

Although the case where the nozzle 2 is of the fixed type has been described above, the case of the rotary type nozzle 2'is also configured in the same manner as in the case described above, as shown in FIG. The rotary nozzle 2'shows a rotation locus as indicated by a dot-dash line in FIG. 3A, and when the frequency (rotation number) is constant, the jetting area S1 having a constant width spread on both sides of the rotation locus is formed. (Refer to the same figure (b)). As described above, the high-speed rotation mode and the low-speed rotation mode are selectively used, and the random mode is further added to provide a wider injection area S2.

The fixed nozzle 2 and the rotary nozzle 2 '
Alternatively, the cleaning tank 1 may be used together, or may be arranged on both the bottom surface and the ceiling surface of the cleaning tank 1.

[0022]

As described above, in the dishwasher cleaning apparatus of the present invention, even if the nozzle is of a fixed type, the spraying angle and the spraying distance of the cleaning water can be controlled by freely controlling the capacity of the motor pump. It can be changed and the wash water can be widely distributed. Since the nozzle structure is simple, the cost of the product can be reduced.

Further, if the rotary type, the combined fixed / rotary type, or the planetary rotary type is adopted as the nozzle type, the cleaning effect can be further enhanced.

Furthermore, by selecting a control mode suitable for the cleaning process, the condition of the dishes, etc., the cleaning efficiency can be improved, the power consumption can be reduced, and the cleaning noise can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment.

FIG. 2 is a time-rotational speed relationship diagram of the random control mode of the above.

FIG. 3 is a time-rotational speed relationship diagram in the same high-speed / low-speed rotation mode as above.

FIG. 4A is a block diagram of another embodiment. (B) A plan view of the same rotation trajectory (C) Partly enlarged plan view of (b)

[Explanation of symbols]

1 cleaning tank 2 nozzles 2'rotary nozzle 3 arc surface 4 Washing pump 5 water supply passage 6 pump motor 7 power supply 8 control device 9 Command means 10 Commercial power supply 11 Rectifier 12 inverter

Front page continued (72) Inventor Yuta Noma 1-20-5 Tenma, Kita-ku, Osaka City, Zojirushi Mahobin Co., Ltd. (56) Reference JP-A-6-7282 (JP, A) JP-A-11-346987 (JP, A) JP-A-7-31575 (JP, A) JP-A-4-122351 (JP, A) JP-A-11-267085 (JP, A) JP-A-7-75617 (JP, A) Kaihei 5-176875 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47L 15/42 A47L 15/46 F04B 49/06 311

Claims (3)

(57) [Claims] 1. A required number of nozzles facing a cleaning tank, a cleaning pump for supplying cleaning water to the nozzle, a power supply unit for the cleaning pump, and a control unit , the power supply unit being a commercial power supply, It consists of a rectifier that rectifies the AC power and an inverter that converts the DC power rectified by the rectifier into AC power. The controller controls the AC power converted by the inverter, and the cleaning is performed by the AC power. In the dishwasher washing device in which the pump motor of the pump is driven ,
In the cleaning process, the pump motor is
Cleaning equipment for dishwashers characterized by controlling in low-speed rotation mode in the grinding process . 2. The washing apparatus for a dishwasher according to claim 1 , wherein the control device controls the pump motor in a random mode in which the rotation speed changes randomly. 3. A required number of nozzles facing the cleaning tank, and
A cleaning pump that supplies cleaning water to the nozzle and the above-mentioned cleaning pump
Power supply unit and control unit.
A commercial power source, a rectifier that rectifies the AC power, and its adjustment
A converter that converts the DC power rectified by the current transformer into AC power.
And an inverter, which is controlled by the control device.
Control the AC power converted by
A food designed to drive the pump motor of the above washing pump.
A washing device for a dishwasher, wherein the controller controls the pump motor in a random mode in which the rotation speed changes randomly.