KR101053593B1 - Leakage Detection Device of Dishwasher and Method - Google Patents

Abstract

The present invention relates to a leak detection device and method for detecting a leak in a dishwasher, and in a dishwasher equipped with a washing motor, after a water supply is performed to a predetermined level according to a user's washing instruction, a washing stroke Starting; Periodically sensing the rotational speed R1 of the cleaning motor while performing the cleaning stroke; When the number of rotations R1 of the washing motor exceeds the preset range R0, the washing motor determines that there is a leak and stops the washing stroke and displays a leakage error message.

Therefore, the present invention can reduce the production cost of the product because it does not need to configure a separate leak detection means for detecting the leak, it is possible to prevent the leak detection error by determining whether the leak using the number of revolutions of the washing motor Can be.

Leak / Wash Motor Speed (rpm)

Description

Leak detection device and method of the dishwasher {Apparatus and Method for Sensing Leak of The Dish Washer}

1 is a cross-sectional view showing the configuration of a general dish washer

2 is a cross-sectional view showing the water level detection means of the dishwasher

3 is a flowchart illustrating a leak detection method of a dish washing machine according to the related art.

Figure 4 is a block diagram showing the configuration of the leak detection device of the dishwasher according to the present invention

5 is a flowchart illustrating a leak detection method of the dish washing machine according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

30: cleaning motor 40: Hall sensor

50: display unit 60: system control unit

The present invention relates to a dishwasher, and more particularly, to a leak detection device and a method of the dishwasher for detecting the leak (Leak) without a separate leak detection means.                         

In general, the dishwasher is a device for automatically cleaning the food residue on the dish after eating.

As shown in FIG. 1, in the structure of a general dish washing machine, a tub 1 is formed to have a predetermined space therein, and an upper rack 10 and a lower rack for storing dishes in the tub 1. (11) is provided.

In addition, upper and lower spray arms 8 and 9 for spraying washing water are provided below the upper and lower racks 10 and 11.

In addition, a sump 3 for storing washing water for washing dishes is formed on the bottom surface of the tub 1, and a filter 2 for filtering the washing water is mounted inside the sump 3.

And the heater (not shown) for heating washing water is provided in the lower part of the tub 1.

In addition, a circulation pump 5 for circulating the washing water is provided in the lower side of the sump 3, and the circulation pump 5 has a lower flow path 6 and an upper injection arm connected to the lower injection arm 9. Upper flow paths 7 connected to 8 are formed, respectively.

Then, when the washing is finished in the lower part of the sump (3), a drain pump (12) for draining the washing water is installed, and the water level detecting means (13) for detecting the water level of the washing water supplied for washing and the sump (3) It is connected and installed.

Here, the water level detecting means 13 is a flow meter (13a) for detecting the water level in the sump (3), the leak detection means (13b) for detecting the leak and It consists of a fruit detection means (13c) for detecting the overflow (Overflow).

At this time, the leak and over-water detection means (13b, 13c) is a float switch (Float Switch) due to the washing water flowing into the inside of the material by the buoyancy buoyancy floating on the surface of the switch (SW 1, SW 2) is turned on, and the leak and the fruit water are detected by differently designing the water level at which the switches SW 1 and SW 2 of the leak and fruit water detection means 13b and 13c are turned on.

That is, the system microcomputer (not shown) determines the leak and the fruit according to the switching signal of the leak and the fruit detection means 13b and 13c. If the switch SW 1 is in the OFF state at the normal stroke, Judging, if the switch for detecting the fruit (SW 2) is turned on is determined to be fruit.

Referring to the leak detection method of the conventional dishwasher configured as described above are as follows.

As shown in FIG. 3, when a washing stroke command considering the amount of tableware, the type of tableware, etc. is input from the user (S1), water is supplied to a predetermined level (S2).

Then, various loads are controlled according to the washing algorithm corresponding to the stroke command input from the user to perform the washing stroke (S3).

While the washing stroke is performed, the system microcomputer periodically reads the switch SW 1 signal of the leak detecting means 13b and determines whether there is a leak (S4, S5).

At this time, if the switch for detecting the leakage (SW 1) is on (On) state is normal, so that the signal of the switch for detecting the leakage (SW 1) is periodically determined while continuing the cleaning process.

On the other hand, if the switch for detecting leakage (SW 1) is off (Off), it is determined that the leak, turn off all the loads involved in the cleaning stroke and displays the leak error (S6).

That is, if the leak detection switch SW1 is turned off at the normal stroke time (the washing progress time point), it is determined as a leak and a leak error is displayed.

However, in the conventional case, the leak detection means is mechanically operated through the internal switch, and at this time, the leak detection is detected according to the signal of the internal switch. Since the leak detection means must be designed as a separate structure, the production cost increases. There was a problem.

In addition, the float switch used as a leak / fruit detection means is a normal on / off switching operation is not performed when mechanical interference occurs, which is a factor that reduces the reliability of the product because the accurate leak detection is not made.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an algorithm that can detect leaks more accurately and effectively.

Leakage detection device of the dishwasher according to the present invention for achieving the above object is a washing motor for driving the circulation pump to pump the washing water in the sump (Sump), for detecting the rotational speed (rpm) of the washing motor Speed detection unit, display unit for displaying a leak error, periodically reads the rotational speed of the washing motor from the speed sensing unit during the cleaning stroke and leaks if the rotational speed of the washing motor exceeds the preset range It is characterized in that it comprises a system control unit for displaying a leak error through the display unit at the same time stopping the washing stroke.

At this time, the cleaning motor is characterized in that using a brushless DC (BLDC) motor, the speed sensor is characterized in that using a Hall sensor.

In addition, the leak detection method of the dishwasher according to the present invention for achieving the above object is to start the washing stroke after performing the water supply to the preset water level according to the user's washing instruction in the dishwasher equipped with a washing motor step; Periodically sensing the rotational speed R1 of the cleaning motor while performing the cleaning stroke; When the number of rotations R1 of the washing motor exceeds the preset range R0, the washing motor determines that there is a leak and stops the washing stroke and displays a leakage error message.

Here, the setting range (R0) is characterized in that the rotational speed range that can be output by the washing motor in the normal condition that the water supply up to the set water level.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a leak detection device and a method thereof of a dish washing machine according to the present invention will be described with reference to the accompanying drawings.                     

First, referring to FIG. 4, a leak detection apparatus of the dish washing machine according to the present invention will be described.

Here, since the structure of the dish washing machine is the same as in the prior art, the detailed description is omitted, but the same configuration is denoted by the same reference numerals as in FIG.

The leak detection device of the dish washing machine according to the present invention, as shown in the washing motor 30 for driving the circulation pump 5 to pump the washing water in the sump (Sump) 3, the washing motor 30 Hall sensor 40 for detecting the rotational speed (rpm), display unit 50 for displaying a leak (leak) error, cleaning motor 30 from the hall sensor 40 periodically during the cleaning stroke The system control unit 60 reads the number of revolutions of the motor and the number of revolutions of the washing motor 30 exceeds the preset range, determines that the water leak is stopped, and simultaneously displays the water leakage error through the display unit 50. It consists of.

At this time, the washing motor 30 provides a driving source of the circulation pump 5 for pressurizing the washing water in the sump (3) to deliver to the upper and lower injection arms (8, 9).

In the present invention, the cleaning motor 30 uses a BLDC motor and includes a Hall sensor 40 for detecting the rotational speed (rpm) of the BLDC motor.

The present invention, by using the number of revolutions of the washing motor 30 sensed through the Hall sensor 40 detects the leakage.

First, the system controller 60 drives the cleaning motor 30 by periodically outputting a driving signal having a certain duty to the cleaning motor 30 during the cleaning stroke.                     

In this case, the hall sensor 40 outputs a predetermined signal to the system controller 60 at each rotation of the washing motor 30.

The system control unit 60 calculates the rotation speed (rpm) of the washing motor 30 according to the output signal of the hall sensor 40, and determines whether there is a leak according to the calculated rotation speed of the washing motor 30. do.

Referring to the leak detection method of the dishwasher according to the present invention configured as described above in detail.

As shown in FIG. 5, when a washing stroke command is input from a user (S10), a washing algorithm corresponding to the input washing stroke command is read and water is supplied to a predetermined level (S20).

Then, when the water supply up to the set water level is completed, the process of washing the dishes is performed in earnest (S30).

Subsequently, in order to periodically perform a leak detection process while the washing stroke is performed, the washing motor 30 outputs a driving signal having a certain duty to the washing motor 30 and drives the washing motor 30 according to the driving signal. The rotation speed R1 is calculated (S40).

At this time, it is determined whether or not the calculated speed R1 of the washing motor 30 exceeds the preset range R0 (S50).

As a result of the determination (S50), if the rotational speed R1 of the washing motor 30 does not exceed the setting range R0, the washing stroke is continued, and if it exceeds the setting range R0, the water is judged as a leak and involved in the stroke. At the same time, the driving of all the loads is stopped and a leakage error is displayed through the display unit 50 (S60).

Here, the set range R0 is an experimental value and is a range of rotation speed that the washing motor 30 can output in a normal condition (no water leak) at which water supply is made up to the set water level.

The washing motor 30 has a greater rotational speed because the load is smaller when the washing water decreases due to leakage than when there is no leakage for the driving signal having a certain duty.

The present invention, by periodically checking the rotational speed of the washing motor 30 while the washing stroke is performed can determine whether or not the leakage according to the rotational speed of the washing motor (30).

Leak detection apparatus and method of the dish washing machine according to the present invention as described above has the following effects.

First, since there is no need to configure a separate leak detection means for detecting a leak there is an advantage that can reduce the production cost of the product.

Second, it is possible to improve the product reliability by preventing the leak detection error by determining whether the leak using the rotation speed of the washing motor.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (5)

A washing motor for driving the circulation pump to pump the washing water in the sump, Speed detection unit for detecting the rotational speed (rpm) of the washing motor, A display unit for displaying a leak error, While the cleaning stroke is being performed, the rotation speed of the washing motor is periodically read from the speed detecting unit, and if the rotation speed of the washing motor exceeds the preset range, it is determined that the water is leaked and the cleaning stroke is stopped. Leakage detection device of the dishwasher, characterized in that consisting of a system control unit for displaying. The method of claim 1, The washing motor is a leak detection device of the dishwasher, characterized in that using a brushless DC (BLDC) motor. The method of claim 1, The speed detector is a leak detection device of the dishwasher, characterized in that using the Hall sensor. In a dishwasher with a washing motor, Starting a washing stroke after performing water supply up to a preset water level according to a washing instruction of the user; Periodically sensing the rotational speed R1 of the cleaning motor while performing the cleaning stroke; And, When the number of revolutions (R1) of the washing motor exceeds the preset range (R0), it is determined that the leak is stopped by stopping the washing stroke and at the same time displaying a leak error message characterized in that the dish washing machine. The method of claim 4, wherein The setting range R0 is Leakage detection method of the dishwasher, characterized in that the rotational speed range that the washing motor can output in the normal condition that the water supply is up to the set water level.

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