JPH0788073A - Dish washer/dryer - Google Patents

Abstract

PURPOSE:To secure almost uniform temperature distribution over the whole area of the room without being affected by blast quantity. CONSTITUTION:The washing/drying room 5 is provided with a jet nozzle 9 to jet washing water, a blowoff mouth 11 to spout out air taken in from the inlet mouth 23 by operation of the blowing fan 27 into the washing/drying room 5 and a heater 19 to raise the temperature within the washing/drying room 5 and the blowoff mouth 11 is provided with one or plural movable louver(s) 31, whose blowoff angle is changeable, to make the distributed temperature of the air in the whole washing/drying room raised by the heater 19 almost uniform by dry air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher / dryer.

[0002]

2. Description of the Related Art Generally, in a dishwasher, a dishwasher set in a washing and drying chamber is sprayed with washing water to wash the dish, and then a drying process is performed to blow dry air. It has become.

[0003]

DISCLOSURE OF THE INVENTION In the dishwasher as described above, after washing, the drying process is successively performed to dry the dishes, but in order to shorten the drying time, The temperature is raised by the heater.

That is, the temperature of the tableware surface is raised by raising the ambient temperature in the washing / drying chamber with the heater.
The water vapor pressure on the surface of the tableware and the differential pressure between the water vapor pressure of the air are used to evaporate and move the water to dry the tableware, and the evaporation rate W _V is expressed by the following equation.

W _V = h _D · ρ _O · A _d (P _d −P _O ) ... (1) h _D : Mass transfer coefficient ρ: Density P: Vapor pressure A: Area subscript d: Tableware, O : air where heat transfer Q _Od from the air to the _{tableware, Q Od = h · a d} (T O -T d) ··· (2) h = heat transfer coefficient T: represented by temperature.

The mass transfer rate h _D and the heat transfer rate h are the air flow rate G
Increases as is increased. Therefore, the evaporation rate W
_V becomes faster as the temperature of the air in the cleaning / drying chamber is higher and the amount of air blown is larger.

Here, when the heater input is Q _H , the air temperature at the heater outlet is represented by Q _H = GΔi, and it can be seen that the air flow rate and the increase in enthalpy are inversely proportional.

Since the temperature increases as the enthalpy increases, the air temperature in the cleaning / drying chamber decreases as the air flow increases. Therefore, the optimum value of the air flow rate (air temperature) is determined from the relationship between the equations (1) and (2) and the mass transfer coefficient h _D and the heat transfer coefficient h.

However, considering the heat resistance of tableware made of plastic or the like, for example, the air temperature may be too high with the optimum air flow rate for drying.

Therefore, the basic air temperature (air flow rate) is operated at an optimum value for drying, and when the heat resistant temperature of the tableware is lower than the optimum value, the basic temperature of the air is adjusted to the heat resistant temperature of the tableware, etc. It is necessary to change the air temperature. As one of them, there is a method of changing the air flow rate according to the set temperature. However, when the air flow rate is changed, the flow pattern in the cleaning / drying chamber changes. One example thereof is shown in FIGS. As shown in FIG. 8, when the air flow rate from the air outlet 101 is increased, the air outlet speed may be increased, and a region a in which the air does not easily flow and a blind spot may appear in the cleaning / drying chamber 103.

That is, when the air flow rate is increased in order to lower the air temperature in the cleaning / drying chamber 103 in accordance with the heat resistant temperature of the tableware, the average indoor air temperature raised by the heater 105 increases the air flow rate. However, due to the change in the distribution of the air flow rate, the air temperature does not decrease in the area a, which corresponds to the blind spot, and in some cases, the heat resistant temperature of the tableware may be exceeded. The same problem occurs when it is desired to raise the air temperature.

[0012] Therefore, an object of the present invention is to provide a dishwasher / dryer capable of constantly obtaining a substantially uniform temperature distribution over the entire area of the room in accordance with the air flow rate.

[0013]

In order to achieve the above-mentioned object, the present invention serves to clean the outside air taken in from a blow-in port by the operation of a blowing fan and a spray nozzle for spraying cleaning water into a cleaning / drying chamber. An outlet that blows into the drying chamber and a heater that raises the temperature in the cleaning / drying chamber are provided, and the outlet angle that makes the distribution temperature of the entire cleaning / drying chamber increased by the heater substantially uniform by the drying air in the outlet. One or a plurality of movable louvers whose number changes is provided.

As a preferred embodiment, the movable louver is characterized in that its operation is controlled in accordance with a temperature or a temperature difference detected by sensors set at a plurality of positions in the cleaning / drying chamber.

[0015]

[Operation] According to such a dishwasher, after washing is completed,
Subsequently, the drying process is started, and the outside air taken in from the suction port by the operation of the blower fan is blown as dry air into the cleaning / drying chamber from the blowing port. At this time, the blowing angle of each movable louver changes according to the change of the air flow rate,
As a result of the dry air flowing over the entire area of the washing and drying room, there is no blind spot area where the dry air is hard to reach.
A nearly uniform temperature distribution can always be obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings of FIGS.

In FIG. 1, reference numeral 1 denotes a dryer main body of a dishwasher dryer. By opening an opening / closing door 3 provided on the front surface of the dryer main body 1, loading / unloading of dishes into / from a cleaning / drying chamber 5 is performed. Is possible.

Inside the cleaning / drying chamber 5, there are provided a cleaning nozzle 9 of the cleaning device 7, an outlet 11 and an outlet 13 for blowing dry air.

The cleaning device 7 has a cleaning pump 17 communicating with the return tank 15, and the cleaning water sent from the cleaning pump 17 is sprayed from the cleaning nozzle 9 and heated by the heater 19. There is.

The heater 19 is controlled to a desired set temperature by a control unit (not shown) and is laid out in a ring shape in the cleaning / drying chamber 5 as shown in FIG. And the function of increasing the air temperature in the drying / cleaning chamber 5 during cleaning.

On the other hand, the outlet 11 has an intake duct 19
The outlet 13 communicates with the exhaust duct 21.

The intake duct 19 is arranged from above the cleaning / drying chamber 5 to the back wall surface, and one suction port 23 is provided in the right side region of the upper front panel 25 of the opening / closing door 3. The other outlet 11 is provided on the back wall surface of the cleaning / drying chamber 5, and a blower fan 27 having a variable rotation speed is provided on the back wall surface area of the intake duct 19.
As a result, the dry air taken from the suction port 23 by the operation of the blower fan 27 is forcibly sent into the cleaning / drying chamber 5.

The exhaust duct 21 is arranged above the cleaning / drying chamber 5, and the one outlet 13 faces the cleaning / drying chamber 5. The other exhaust port 29 is provided in the left side region of the upper front panel 25 of the opening / closing door 3, and the dry air having finished the work is exhausted to the outside through the exhaust duct 21.

On the other hand, a plurality of movable louvers 31 having different blowing angles are provided at the blowing port 11 for blowing the dry air into the cleaning / drying chamber 5.

As shown in FIGS. 2 and 3, the movable louver 31 is formed as a unit integrally formed with the drive unit 33, and the pinion shaft 37a of the pinion 37 sandwiched between the movable rack 33 and the fixed rack 35. It is fixedly supported by.

In the rated operation, each movable louver 31 is preset to an optimum blowing angle as shown in FIG. 3, and the movable rack 33 moves to correspond to the movement amount from the set blowing angle. Then, the angle change of each movable louver 31 can be obtained. In this case, the pinion outer peripheral surface of the movable louver 31 that guides the blown air straight does not have a gear portion, so that when the moving rack 33 moves, an angle change due to meshing does not occur.

The fixed rack 35 is fixedly supported by the drive case 39, while the movable rack 33 is movably supported by a rotary plate 43 to which rotational power decelerated by the drive motor 41 is applied, as indicated by arrow a.

The drive motor 41 has a rotation speed of the blower fan 27, that is, an air flow rate and a temperature from a plurality of sensors C ₁ , C ₂ , C ₃ , C ₄ provided at predetermined positions in the cleaning / drying chamber 5. The operation is controlled based on the detection signal detected according to the temperature difference between the sensors.

In FIG. 1, reference numeral 45 denotes a drainage pump.

According to the dish washer / dryer thus constructed, the washing water from the washing nozzle 9 is heated by the heater 19 and is sprayed onto the dishes to perform washing. After the washing is completed, the drying process is started. In the drying process, the sensors C _{1 to} C ₄ , the heater 19 and the blower fan 27 are turned on. As a result, the outside air taken in through the blow-in port 23 is blown out as dry air into the cleaning / drying chamber 5 through the blow-out port 11, and the dishes are dried.

During this drying process, the cleaning and drying chamber 5
The temperature distribution inside is managed by each of the sensors C _{1 to} C ₄ , and the movable louver 31 is controlled so as to be displaced by a predetermined angle based on the detection signals from the sensors C _{1 to} C ₄ . Therefore, for example, even if the blowing speed is increased as shown in FIGS. 4 to 5, the movable louver 31 ensures that the dry air flows over the entire area of the cleaning / drying chamber 5,
The blind spot area is eliminated, and a substantially uniform temperature distribution can be obtained over the entire area in the cleaning / drying chamber 5.

[0032]

As described above, according to the dishwasher / dryer of the present invention, it is possible to obtain a substantially constant temperature distribution over the entire area of the washing / drying chamber without being affected by the air flow rate. . Therefore, since the temperature is not locally too high or too low, it is possible to prevent the tableware from being adversely affected and to perform efficient drying.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a dishwasher / dryer in which the present invention is implemented.

FIG. 2 is a perspective view of a movable louver.

FIG. 3 is an explanatory diagram of a drive unit of a movable louver.

FIG. 4 is an explanatory diagram showing the flow of dry air during rated operation.

FIG. 5 is an explanatory view showing the flow of dry air when the capacity is increased from the rated operation.

FIG. 6 is a perspective view of the entire dishwasher / dryer.

FIG. 7 is an explanatory view similar to FIG. 4 showing a conventional example.

FIG. 8 is an explanatory view similar to FIG. 5 showing a conventional example.

[Explanation of symbols]

 5 ... Washing / drying chamber 9 ... Injection nozzle 11 ... Blowout port 19 ... Heater 23 ... Suction port 27 ... Blower fan 31 ... Movable louver

Claims (2)

[Claims] 1. A spray nozzle for spraying cleaning water into the cleaning / drying chamber, an outlet for blowing outside air taken in from a suction port into the cleaning / drying chamber by operating a blower fan, and raising the temperature in the cleaning / drying chamber. A heater is provided, and one or a plurality of movable louvers with varying blowing angles are provided at the outlet to make the distribution temperature of the entire cleaning / drying chamber increased by the heater substantially uniform by the drying air. And a dishwasher. 2. The dishwasher / dryer according to claim 1, wherein the movable louver is operation-controlled in accordance with a temperature or a temperature difference detected by sensors set at a plurality of positions in the washing / drying chamber. .