JP2506932B2 - Dishwasher - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dishwasher capable of drying dishes.

2. Description of the Related Art A conventional dishwasher of this type is shown in FIG.

That is, the intake duct 2 communicating with the opening 1a provided at the lower rear portion of the cleaning tank 1 is provided, and the fan case 3 is connected to the intake duct 2. A motor 4 is attached to the outer surface of the fan case 3, and a blower fan 5 is provided inside the fan case 3 by being directly connected to the motor 4.

In addition, a heater 6 serving as a heat source is provided near the bottom of the cleaning tank 1.
In addition to the above, a temperature rise prevention device 7 is provided near the heater 6 outside the cleaning tank 1.

With the above configuration, during the operation of the drying process for drying the dishes 8 placed in the cleaning tank 1, the heater 6 is energized for a preset ON / OFF time to raise the temperature in the cleaning tank 1, and The motor 4 is energized, and the blower fan 5 blows the outside air through the intake duct 2 into the cleaning tank 1 through the opening 1a provided in the lower portion of the cleaning tank 1 so that the steam generated in the cleaning tank 1 is discharged to the outside of the cleaning tank 1. The dishes 8 and the washing tank 1 were dried by forced evacuation.

However, in the conventional configuration, since the outside air is taken into the cleaning tank 1 by the blower fan 5 during the drying process operation, the temperature inside the cleaning tank 1 is easily influenced by the outside air temperature,
In particular, when the outside air temperature is low, the temperature in the washing tank 1 is also lowered, water droplets adhering to the surface of the tableware 8 cannot be sufficiently dried, and there is a problem that the drying performance is lowered. Further, when the outside air temperature is high, the heater 6 is intermittently energized for a preset ON / OFF time, so that the dry state of the dishes 8 and the washing tank 1 becomes over-dried, which causes a time loss. At the same time, in detecting the temperature in the cleaning tank 1, there is a problem in that electric energy is wasted because the operation of the overheat prevention device 7 provided near the heater 6 is slow.

In view of the above problems, it is an object of the present invention to prevent the drying performance from deteriorating due to the atmosphere of the outside air and to perform appropriate drying with energy saving.

Means for Solving the Problems In order to achieve the above object, the present invention is a washing tank for storing dishes, a heating means arranged at a lower portion in the washing tank,
An intake path having an opening on one end side facing the heating means at the lower part of the cleaning tank, and a forced exhaust air blowing means connected to the other end of the intake path are provided, and are located above the opening facing the cleaning tank. The temperature detection means is provided in a part of the intake path, and the control means has a control means for controlling the drying process by controlling the heating means, forced exhaust air blowing means, etc. based on the detection signal of the temperature detection means. In the drying step of operating the means, at least one of the drying time, the heating amount of the heating means, and the air flow rate of the forced exhaust air blowing means is controlled.

Action The action of the above configuration is as follows.

That is, during operation of the drying process, the control means blows the outside air into the cleaning tank through the intake path by the blower fan and detects the temperature inside the intake path to accurately detect the outside air temperature. Based on the signal, it is possible to control the heating means, the air blowing means, etc. for drying the tableware so that the drying performance becomes constant.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, one end of an intake duct 2 which is an intake path communicating with the inside of the cleaning tank 1 is connected to the opening 1a of the cleaning tank 1, and a fan case 3 is provided on the other end side of the intake duct 2. ing. A motor 4 is attached to the fan case 3 and is connected directly to the motor 4 to house a blower fan 5 in the fan case. The fan case 3, the motor 4, and the blower fan 5 constitute a forced exhaust blower means. Further, a temperature sensor 9 as a temperature detecting means is attached to a part of the intake duct 2. Reference numeral 6 is a heater which is a heating means arranged in the inner bottom portion of the cleaning tank 1, and 7 is an excessive temperature rise preventing device arranged near the heater 6. The control means 10 controls the heater 6 and the motor 4 during the drying process based on the detection signal of the temperature sensor 9.

The operation of the above configuration will be described. The control means 10 starts energization of the motor 4 and detection of the temperature sensor 9 when the drying process is started. By energizing the motor 4, the blower fan 5 is rotated and the outside air is sent into the cleaning tank 1 through the fan case 3 and the intake duct 2. By controlling the drying process based on this detection signal, the control means 10 can remove the factor of the change in the outside air temperature that has the greatest influence on the drying performance of the tableware 8.

As a result, it is possible to prevent the drying performance from deteriorating and becoming unstable when the outside temperature is low, and to prevent the time loss and the loss of electrical energy when the outside temperature is high. Further, since the temperature detecting means is provided in a part of the intake path located above the opening facing the cleaning tank,
Even if the cleaning water enters the intake path through the opening, the cleaning water does not directly adhere to the temperature detecting means, and the detection accuracy of the temperature detecting means can be secured for a long period of time.

The control of the drying step is to control the heater 6 to have a constant energization ratio, to shorten the drying time when the outside air temperature is high, and to lengthen it when the outside air temperature is low, and to turn off the heater energization ratio when the outside air temperature is high. When the time ratio is high and low, the control to shorten the off time is short, the air flow of the blower fan is high when the outside air temperature is high, and the control is low when it is low.In addition, the drying time, heater energization rate control and air flow are all It controls the factors for the drying of tableware, such as control.

EFFECTS OF THE INVENTION As is clear from the description of the embodiments above, according to the present invention, by providing the temperature detecting means in the intake passage communicating with the cleaning tank, the outside air temperature can be detected with high accuracy, and
By controlling the drying process by the detection signal of the temperature detecting means, the drying process can be controlled according to the outside air temperature that has the greatest influence on the drying of the dishes, and the deterioration of the drying performance when the outside air temperature is low can be prevented. At the same time, time loss and waste of energy when the outside air temperature is high can be eliminated.

[Brief description of drawings]

FIG. 1 is a block diagram showing a dishwasher according to an embodiment of the present invention,
FIG. 2 is a block diagram showing a conventional dishwasher. 1 ... Washing tank, 2 ... Intake duct, 3 ... Fan case, 5 ... Blower fan, 6 ... Heater, 7 ... Overtemperature prevention device, 9 ... Temperature sensor, 10 ... Control means.

Claims (1)

(57) [Claims] 1. A washing tank for storing dishes, a heating means arranged in the lower portion of the washing tank, an intake path having an opening on one end side facing the heating means in the lower portion of the cleaning tank, and the intake air. A forced exhaust air blowing means connected to the other end of the path, and a temperature detecting means is provided in a part of the intake path located above the opening facing the cleaning tank, and based on the detection signal of the temperature detecting means. It has a control means for controlling the drying step by controlling the heating means, the forced exhaust air blowing means, etc., and the control means, in the drying step for operating the heating means, at least the drying time
A dishwasher that controls either one of the heating amount of the heating unit and the blowing amount of the forced exhaust blowing unit.