JPH02195930A - Control device for dish washer - Google Patents

Abstract

PURPOSE:To efficiently and surely wash different kinds of dishes by selecting the first data based on the first operation signal when dishes are heavy and the second data based on the second operation signal when they are light and controlling a motor to be rotated at the rotating speed corresponding to the specific injection quantity in response to the elapse of the washing time based on the selected data. CONSTITUTION:When dishes 13a-13a are heavy, the rotating speed of a motor 14 is controlled slightly high based on the curve L1 of the first data, the quantity of the injection hot water current from washing nozzles 11a and 11b is controlled slightly large. The dishes 13a-13a are quickly washed by a slightly large quantity of the injection hot water current in the stable state by the tare weight regardless of the slightly large injection pressure of the injection hot water current. When the dishes 13a-13a are light, the rotating speed of the motor 14 is controlled slightly low based on the curve 1 of the second data, and the quantity of the injection hot water current from the washing nozzles 11a and 11b is controlled slightly small. The dishes 13a-13a are washed by the slightly low injection pressure of the injection hot water current in the stable state regardless of the light tare weight.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a dishwasher, and in particular, to a washing machine for a dishwasher,
The present invention relates to a control device suitable for controlling operations such as rinsing.

(Prior Art) Conventionally, in this type of dishwasher, there is one in which washing hot water in a washing water tank is sprayed into a washing chamber through a spray nozzle to wash and rinse the dishes in the washing chamber ( For example, see Japanese Patent Application Laid-Open No. 5063768).

(Problem to be Solved by the Invention) However, in such a configuration, when washing various tableware such as curry plates and glasses that have different weights or degrees of dirt, the tableware in the washing chamber is exposed to the hot water jet from the jet nozzle. In order to prevent problems such as curling over or being blown away by water, the pressure and flow rate of the hot water jet from the jet nozzle must be low and low enough to stably wash light tableware. It was set to be the flow rate. Therefore, there is a problem in that it takes a long time to wash heavily soiled dishes, resulting in poor cleaning efficiency.

Therefore, in order to deal with this problem, the present invention realizes efficient and accurate cleaning operations in a dishwasher at all times with control content that matches the type of tableware, even when the type of tableware changes. It is an object of the present invention to provide a control device that does the following.

(Means for solving the problem) In solving the problem, the structural features of the present invention are as follows:
As illustrated in Fig. 1, an electric motor, a cleaning pump that is driven by the electric motor and pumps out cleaning hot water from a cleaning hot water tank in an amount corresponding to the number of revolutions of the electric motor, and are arranged in the cleaning chamber. In the dishwasher 1, the dishwasher 1 is equipped with a washing nozzle that sprays washing hot water from the washing pump as a jet vortex toward the dishes, and the dishwasher 1 washes the dishes with the jet of hot water, when the dishes are heavy. an operating means 2 that is operated to generate an operating signal and generate a second operating signal when the operating signal is light; and an operating means 2 that is operated to generate a second operating signal when the operating signal is light, and the amount of the jet vortex is determined to be suitable for washing the heavy dishes in relation to the passage of washing time. The first
data, and the jet amount of the jet vortex is suitable for washing the light tableware in relation to the passage of washing time.
storage means 3 for storing second data determined to be less than data; and selection means for selecting the first data based on the first operation signal and selecting the second data based on the second operation signal. 4, and a control means 5 for controlling the electric motor to rotate at a rotational speed corresponding to the injection amount specified as the cleaning time elapses based on the first or second selection data. It's because I did it.

(Operation) By configuring the present invention in this way, when the tableware is heavy, when the first S operation signal is generated from the operation means 2, the selection means 4 selects the first data from the stored contents of the storage means 3. Then, the control means 5 controls the electric motor to rotate at a rotation speed corresponding to the injection amount specified as the cleaning time elapses based on the first selection data.Then, the cleaning pump The washing hot water in the washing water tank is pumped out in an amount corresponding to the rotational speed of the electric motor controlled in this manner, and is sprayed onto the heavy tableware as a stream of hot water through the washing nozzle.

On the other hand, if the second operation signal is generated from the operation means 2 when the tableware is light, the selection means 4 selects the second data from the stored contents of the storage means 3, and the control means 5 selects the second selected data. The electric motor is controlled to rotate at a rotational speed corresponding to the injection amount specified as the basic cleaning time elapses.

Then, the washing pump pumps out the washing hot water from the washing water tank in an amount corresponding to the rotational speed of the electric motor controlled in this way and sprays it onto the light tableware as a jet of hot water through the washing nozzle. .

(Effect) As described above, the first and second data are stored in the storage means 3, and one of these data is selected by the selection means 4 in response to the selection operation of the operation means 2. Then, the rotational speed of the electric motor is controlled based on one of the two data so as to be suitable for the types of tableware having different weights as the washing time elapses. In other words, when the tableware is heavy, the rotational speed of the electric motor is controlled to be high, and the amount of hot water jetted from the cleaning nozzle by the cleaning pump is large (that is, the injection pressure is high). On the other hand, when the tableware is light, the rotation speed of the electric motor is controlled to be low, and the amount of vortex jetted from the cleaning nozzle by the cleaning pump is small (i.e., the jetting pressure is low). controlled by.

Therefore, when the tableware is heavy, the tableware can be quickly washed by the large amount of the hot water jet in a stable state due to its own weight despite the high jetting pressure of the hot water jet. Therefore, cleaning time can be shortened while improving cleaning quality. On the other hand, when the tableware is light, the tableware is washed in a stable state despite its light weight due to the low jetting pressure of the hot water jet, so that the tableware is washed like a glass top. Even if it is easily damaged,
It is economical because it does not blow away or turn over, and can be cleaned without causing any damage.

Further, the first data is stored in the storage means 3 as first frequency data in which a frequency corresponding to the injection amount is determined to be suitable for washing the heavy tableware in relation to the passage of the washing time, The second data is stored in the storage means 3 as second frequency data in which the frequency is determined to be lower than the first frequency data so as to be suitable for washing the light dishes in relation to the passage of the washing time. , the electric motor is constituted by an induction motor, and when the selection means 4 selects the first or second frequency data based on the first or second operation signal, the selection means 4 selects the first or second frequency data based on the first or second operation signal. The first or second Based on the frequency data, the inverter means of the control means 5 controls the rotation speed of the induction motor to be high or low. Therefore, substantially the same effects as described above can be achieved. In such a case, due to the frequency conversion action of the inverter means, the commercial power supply is
Hz) or even 60 (Hz), it is possible to ensure the desired control of the rotational speed of the induction motor as described above, i.e. the desired control of the amount of the jet vortex from the cleaning nozzle, without being subject to any limitations thereby. can.

<Example> Hereinafter, one example of the present invention will be described with reference to the drawings.
The figure shows a dishwasher to which the control device according to the invention shown in FIG. 3 is applied. This dishwasher has cleaning chamber 1.
In the cleaning chamber 10, a pair of upper and lower cleaning nozzles lla and 11b are arranged horizontally and rotatably opposite each other, and each pipe P1. A pair of upper and lower rinsing nozzles 12a, 12
Each pipe P3.b faces each other inside each cleaning nozzle lla, llb and is horizontally rotatable. It is pivotally supported and attached to the tip of P4. In addition, both rinse nozzles 12
A rack 13 on which tableware 13a to 13a are placed is horizontally arranged between a and 12b.

Each of the cleaning nozzles lla and llb rotates in accordance with the cleaning hot water that is force-fed from each pipe P1P2 as described later, and injects the hot water toward each of the dishes 13a to 13a as a stream of hot water. On the other hand, each rinse nozzle 12a 12b is connected to each pipe p3.
As will be described later, the rinsing water is rotated in response to the rinsing water pumped from p4 and sprayed as a stream of hot water toward each tableware 13a to 13a. In such a case, each nozzle lla, llb, 1
The rotational speeds of 2a and 12b are approximately proportional to the injection pressure of each of the molten metal streams. Also, each nozzle lla, llb.

The outward injection angles of the jet vortices from 12a and 12b with respect to the vertical direction are also approximately proportional to the injection pressure of each jet vortex.

The cleaning pump 14 is driven by an electric motor 14a (see FIG. 3), pumps out hot water flowing from the cleaning chamber 10 into the cleaning hot water tank 10a via the filter 10b, and pumps the hot water to each pipe P1.
The hot water passes through P2 and is force-fed to each of the cleaning nozzles 11a and 11b as cleaning hot water. On the other hand, the rinsing pump 15 is powered by an electric motor 15a (
(see Fig. 3), from the hot water source 16 to the piping P.
The hot water is pumped out through the upstream part of pipe P5, and the hot water is pumped out through the upstream part of pipe P5 and both pipes P3. Each rinse nozzle 1 as rinse water via P4
2a Pressure feed to 12b. In addition, the code 10 in Figure 2
c indicates an overflow pipe, and 16a indicates a pole tap. Furthermore, in this embodiment, the electric motor 1
4a is a three-phase squirrel cage induction motor (200V, 1.5
KW) is adopted, and on the other hand, as the electric motor 15a,
A three-phase squirrel cage induction motor (200V, 200W) is used.

Next, the electric circuit configuration of the control device will be explained with reference to FIG. Door switch 20 generates a close signal in response to closing of the dishwasher door.

Further, this door switch 20 also functions as a mode selection switch for placing the dishwasher in the standard operation mode as described below. The mode selector switch 30 is
It is operated to generate a mode switching signal when the dishwasher is placed in a snack machine operating mode as described below. However, this mode changeover switch 30 is arranged at a position on the surface of the door where it can be easily operated.

The microcomputer 40 executes a computer program in cooperation with the door switch 20 and the mode changeover switch 30 according to the flowchart shown in FIG.
During this execution, arithmetic processing necessary for driving control of the inverter 50 connected to the Hyakurai motors 14a and 15a is performed.

However, the above-mentioned computer program is stored in the ROM of the microcomputer 40 in advance. The ROM of the microcomputer 40 also contains first control data as shown in FIG. 5 (corresponding to the standard operation mode) and second control data as shown in FIG. 6 (corresponding to the snack machine operation mode). is stored in advance. These control data for both cylinders 1 and 2 are both specified by changes in the output frequency of the inverter 50 over time t, and the first control data is for both lines L1. On the other hand, the second control data is data representing both lines J21ρ.
This is data representing 2.

Here, each curve L1. L2, ρ3. The basis for determining ρ2 as shown in FIGS. 5 and 6 will be explained. The types of tableware to be washed in a dishwasher can be divided into two types, light and heavy, depending on their weight. Usually, heavy tableware, such as a curry plate, has a large cleaning surface and is often heavily soiled. On the other hand, many light tablewares, such as glasses, have a narrow cleaning surface and do not get dirty easily. In addition, when washing and rinsing heavy dishes, even if the injection amount of each jet of hot water is increased to increase the injection pressure of each nozzle lla, llb, 12a, 12b, the dishes will become unstable due to the jet vortex. Rack 1
The state can be maintained as it is placed on 3. On the other hand, when washing and rinsing light dishes, each nozzle lla and llb
, 12a.

Unless the injection amount of each jet of hot water is reduced so as to lower the jet pressure of 12b, the tableware will be overturned or blown away due to the jet vortex. Further, even if the spray amount is reduced in this way, if the dishes are lightly soiled, cleaning efficiency and rinsing efficiency can be maintained appropriately. From this point of view, each curve L1+L2 corresponds to washing and rinsing of heavy tableware, while each curve ρ1. By matching ρ2, the change range of the output frequency f in both lines J21, . The range was set to be approximately 10 (Hz) higher than the range of change in the output frequency at ρ2. However, the output frequency f is the rotation speed of each electric motor 14a, 15a, that is, each nozzle 11a, llb, 12a, 12
It is proportional to the injection amount of the injection flow of b.

Also, immediately after the start of cleaning, Ta≦t≦Tb and ta≦t≦t
In b, the output frequency f was set to increase in proportion to time t in relation to each curve L1 and ρ1. This is because when the output frequency f is instantaneously increased at the same time as the start of cleaning, the amount of hot water jetted from each nozzle 11a, llb, 12a, and 12b is instantaneously and discontinuously increased. This is to prevent abnormal noises that are predicted to occur inside the vehicle. In addition, each nozzle lla, 11b, 1
This is also to reduce the sudden impact force applied to the rotation mechanism of 2a, 12b when they start rotating.

In this example, Tb-Ta=tb-ta=2 (seconds).

Moreover, when the injection amount of the jet vortex from each cleaning nozzle lla, 1F-b is varied, the injection angle of each jet molten metal flow is also changed following the same fluctuation. Therefore, since the collision force and collision range of the jet of hot water on the tableware l\ change, stains on the tableware can be efficiently removed evenly and in every nook and corner. Therefore, Tb
When ≦t≦Tc and tb≦t≦tc, the output frequency f is maintained at a constant value to the extent that the dirt stuck to the tableware becomes soft and detached within this time, and Tc≦t≦T
d and tc≦t≦td, the output frequency f is varied up and down. However, TdTa=32 (seconds)
and td-ta=27 seconds). In addition, in the curve L2, f=60 (Te≦t≦T'' f)
Hz), and in curve J22, te≦t≦
f=50 (Hz) at tf. However, T e −
T d = t e −t d5 seconds) and also T
f-Te=tf-te7 (seconds).

The inverter 50 is activated by being supplied with power from a commercial power source (3-phase 200V).
Under control by a microcomputer 40 as described below based on the first or second control data, the first or second control data is controlled by the electric motor 14a or 15a at a rotation speed proportional to the specified output frequency f. A first or second output voltage is generated in three phases to rotate the motor.

In this embodiment configured as described above, the washing and rinsing operations according to the types of tableware will be explained.

(1) It is assumed that each of the tableware 13a to 13a is a relatively heavy type with a lot of dirt.

When the apparatus of the present invention is put into operation, the microcomputer 40 starts executing a computer program in step 60 according to the flowchart of FIG.
Initialize at step 1, and 1NO at step 62.
It is determined that Next, when the door of the dishwasher is closed, the door switch 20 generates a close signal, and the microcomputer 40 in step 62
YESJ is determined, NO is determined in step 63, and step 64 reads the first control data from the ROM and advances the computer program to a first inverter control routine 65.

Therefore, in this first inverter control routine 65, after determining rYES in step 62, the microcomputer 40 performs a time adjustment based on the curve L1 of the first control data from time tTa to t=Td. An output signal is generated at an output frequency f that is determined over time. Then, based on the output signal from the microcomputer 40, the inverter 50 operates the electric motor 1 with three-phase AC power having the frequency f of the output signal as time t elapses.
Controls the rotation speed of 4a. Then, the cleaning pump 14
The cleaning hot water in the cleaning hot water tank 10a is pumped out in an amount corresponding to the rotation speed of the electric motor 14a controlled in this way, and the cleaning hot water is pumped out from both piping P.
, P2 to the two washing nozzles lla and llb, and while these washing nozzles lla and llb rotate, the washing water is jetted as a hot water jet toward each tableware 13a to 13a. Thereby, each tableware 13a to 13a is washed.

In other words, when the dishes 13a to 13a are heavy, the rotation speed of the electric motor 14a is controlled to be high based on the curve L1, and the amount of hot water jetted from each washing nozzle lla, llb is increased (
That is, the injection pressure is controlled to be relatively high. Accordingly, each tableware 13a to 13a is quickly washed by a large amount of the same hot water jet in a stable state due to its own weight, despite the high jetting pressure of the hot water jet. , it is possible to shorten the cleaning time while improving the cleaning quality.

In addition, in such a cleaning process, the output frequency f increases in proportion to the time t along the linear rising portion of the curve L1 from t=Ta to t=Tb, so that the motor 1
4a, the amount of cleaning hot water pumped out by the cleaning pump 14, and each cleaning nozzle 11a.

The injection amount of each injection stream 11b also increases sequentially from zero to a value corresponding to -60. In other words, since the injection amount of each jet of hot water into the cleaning chamber 10 does not instantaneously reach a value corresponding to f60, the injection pressure of each jet vortex to each cleaning nozzle lla, llb does not increase rapidly. As a result, no abnormal impact force is applied to the rotating mechanism portion of each cleaning nozzle lla, llb. In addition, since the amount of hot water jetted into the cleaning chamber 10 gradually increases as described above,
No abnormal noise is caused in the cleaning chamber 10.

Furthermore, at t=Tc to t=Td, the output frequency f fluctuates following the curve L1 as shown in FIG.
The rotational speed of the electric motor 14a, the amount of cleaning hot water pumped out by the cleaning pump 14, and each cleaning nozzle 11a.

The injection amount, injection pressure, and injection angle of each injection vortex flow 11b also vary in the same way. Therefore, each cleaning nozzle 11a.

The jetted vortex flow from 11b travels evenly through each tableware 13a to 13a while changing its amount, jetting force, and jetting direction. Therefore, t= T b ” T
The dirt that could not be removed in step c can be reliably removed.

Furthermore, due to the frequency conversion effect of the inverter 50, even if the commercial power source is 50 (H2) or 60 (Hz), the rotational speed of the electric motor 14a as described above, i.e., without being subject to any restrictions due to this, Desired control of the hot water flow from each cleaning nozzle lla, llb can be ensured. Further, by employing the inverter 50, it is completely unnecessary to connect the input lines of the electric motor 14a in consideration of the rotational direction, and it is also unnecessary to prevent the cleaning pump 14 from reversing.

After completing the cleaning as described above, in the first inverter control routine 65, the microcomputer 40 determines that t=
From Te to t=Tf, an output signal is generated at f-60 based on the curve L2 of the first control data. Then,
Based on the output signal, the inverter 50 controls the rotation speed of the electric motor 15a using three-phase AC power with f-60. Next, the rinse pump 15 pumps out hot water from the hot water supply source 16 in an amount corresponding to the number of rotations of the electric motor 15a controlled in this way, and supplies the hot water to each pipe P5. P4. (2) Each of the dishes 13a to 13a is rinsed by force-feeding the rinsing water through the rinsing nozzles 12a and 12b to the two rinsing nozzles 12a and 12b, and as the rinsing nozzles 12a and 12b rotate, the rinsing water is jetted into a vortex stream.9 (2) Each of the dishes 13a to 13a is of a relatively light type, when the mode changeover switch 30 generates a mode changeover signal in conjunction with the generation of the close signal from the door switch 20 as described above, the microcomputer 40 changes each step 62. At step 63, it is sequentially determined as "rYES", and step 66
At , the second control data is read from the ROM and the computer program is advanced to the second inverter control routine 67.

Then, after the microcomputer 40 determines that it is rYEsJ in step 63, from time t=ta to t=td, the microcomputer 40 outputs an output frequency specified as time t passes based on the curve ρ1 of the second control data. Generates an output signal. Based on the output signal from the microcomputer 40, the inverter 0 controls the rotational speed of the electric motor 14a with three-phase AC power having the frequency f of the output signal as time t elapses. Next, the cleaning pump 14 pumps out the cleaning hot water in the cleaning hot water tank 10a in an amount corresponding to the rotational speed of the electric motor 14a to be cleaned, and pumps out the cleaning hot water from the cleaning hot water tank 10a to the cleaning nozzles lla and llb through both the pipes p, , p2. The washing nozzles lla and llb rotate to spray the washing hot water as a hot water jet toward each tableware 13a to 13a. Thereby, each tableware 13a to 13a is washed.

In other words, when each tableware 13a to 13a is light, the rotational speed of the electric motor 14a is controlled to be low based on the curve ρl, and the amount of hot water jetted from each washing nozzle lla, llb is small (i.e., its The injection pressure is controlled to a low level. Therefore,
Because each of the tableware 13a to 13a is washed in a stable state despite its own weight due to the low jet pressure of each jet vortex, each of the tableware 13a to 13a is easily damaged like a glass. It is economical and can be cleaned without causing any damage even if it is blown away or turning over.

In addition, in such a cleaning process, the output frequency f increases in proportion to the time t along the linear rising portion of the curve βl from t=ta to t=tb, so that the motor 1
4a, the amount of cleaning hot water pumped out by the cleaning pump 14, and each cleaning nozzle 11a.

The injection amount of each injection stream 11b also increases sequentially from zero to a value corresponding to f=50. In other words, since the injection amount of each washing hot water stream into the cleaning chamber 10 does not instantaneously reach a value corresponding to f50, the injection pressure of each injection hot water stream for each cleaning nozzle lla, llb increases rapidly. As a result, no abnormal impact force is applied to the rotating mechanism portion of each cleaning nozzle lla, llb. Furthermore, since the amount of each jet of hot water gradually increases as described above, no abnormal noise is caused in the cleaning chamber 10.

Further, from t=tc to t=td, the output frequency f fluctuates following the curve j21 as shown in FIG. Cleaning nozzle 11a.

The injection amount, injection pressure, and injection angle of each injection stream 11b also vary in the same way. Therefore, the hot water jet from each cleaning nozzle 1la11b reaches every nook and corner of each tableware 13a to 13a while changing the jetting force and the jetting direction. Therefore, the dirt that could not be removed between t=tb and tc can be reliably removed. Other effects during cleaning are the same as when each tableware 13a to 13a is heavy. In addition, the second
The rinsing control based on the curve J22 in the inverter control routine 67 is substantially the same as the case based on the curve L2.

In addition, in carrying out the present invention, in the first and second control data shown in FIGS. 5 and 6, each curve L I ,
L2 + f? 1.122 is replaced with the output frequency f, each nozzle 11a, llb corresponding to this output frequency f
, 12a, 12b in relation to the time t, instead of the inverter 50,
Even if an appropriate drive circuit is employed, washing and rinsing control according to the weight of each tableware and its effects can be achieved in substantially the same way as in the embodiments described above. The electric motors 14a and 15a may be replaced with DC motors or other suitable types as necessary.

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to the statement in claim 1,
2 is a schematic sectional view of the dishwasher, FIG. 3 is a block diagram of a control device according to the present invention for the dishwasher, FIG. 4 is a flowchart showing the operation of the microcomputer in FIG. 3, and FIG. FIG. 5 is a graph showing the first control data, and FIG. 6 is a graph showing the second control data. Explanation of symbols 10...Cleaning chamber, 10a...Cleaning chamber, 11a. 11b...Cleaning nozzle, 13a...Tableware, 14...
・Washing pump, 14a, 15a...Electric motor, 20...
・Door switch, 30...mode changeover switch, 40
...Microcomputer, 50...Inverter.

Claims (2)

[Claims] (1) An electric motor, a cleaning pump that is driven by the electric motor and pumps out cleaning hot water from a cleaning hot water tank in an amount corresponding to the rotation speed of the electric motor, and a cleaning pump that is disposed inside the cleaning chamber and that pumps out cleaning hot water from the cleaning pump. a washing nozzle that sprays hot water as a jet of hot water toward the dishes, and the dishwasher is configured to wash the dishes with the jet of hot water, in which a first operation signal is generated when the dishes are heavy; an operating means that is operated to generate a second operating signal; and first data such that the injection amount of the hot water jet is determined to be suitable for washing the heavy tableware in relation to the elapse of the washing time; and storage means for storing second data in which the amount of the jet of hot water is determined to be smaller than the first data so as to be suitable for cleaning the light tableware in relation to the elapse of the cleaning time; selection means for selecting the first data based on an operation signal and selecting the second data based on the second operation signal, and specifying according to the elapse of the cleaning time based on the first or second selection data A control device for a dishwasher, comprising: control means for controlling the electric motor to rotate at a rotational speed corresponding to the injection amount. (2) The first data is stored in the storage means as first frequency data in which a frequency corresponding to the injection amount is determined to be suitable for washing the heavy tableware in relation to the passage of the washing time. , the second data is stored in the storage means as second frequency data in which the frequency is determined to be lower than the first frequency data so as to be suitable for washing the light dishes in relation to the passage of the washing time. and the electric motor is constituted by an induction motor, and when the selection means selects the first or second frequency data based on the first or second operation signal, the first or second frequency data Item 1, characterized in that the control means is provided with an inverter means for controlling the induction motor so that it rotates at a rotation speed corresponding to the frequency specified according to the passage of the cleaning time based on A control device for a dishwasher as described in .