KR20110046175A - Dish washer with filter clogging detecting means and controll method thereof - Google Patents

Abstract

PURPOSE: A dishwasher with a filter clogging sensing unit and controlling method thereof are provided to check the clogging of a filter for flittering foreign materials by a filter clogging sensing unit. CONSTITUTION: A dishwasher with a filter clogging sensing unit comprises a washing tub, a sump(100), a washing pump, a washer nozzle, a filter, and a pressure sensing unit. The washing tub comprises a rack inside. The rack accepts tableware. The sump is placed within the washing tub. The sump accepts the cleaning water. The sump comprises a soil chamber. The soil chamber comprises the pressure sensing unit. The pressure sensing unit measures the inner pressure of the filter. The washing pump pumps the cleaning water within the sump. The washer nozzle sprays the cleaning water to the tableware. The filter filters the foreign materials included in the cleaning water.

Description

Dishwasher with filter clogging means and control method thereof {DISH WASHER WITH FILTER CLOGGING DETECTING MEANS AND CONTROLL METHOD THEREOF}

The present invention relates to a dish washer having a filter clogging detection means and a control method thereof, and more particularly, to a dish washer having a means for detecting the clogging of the filter for filtering foreign matter separated from the dish during the dish washing process and its It relates to a control method.

The dishwasher is a device capable of washing dirt on the surface of the dishware by spraying high-pressure washing water onto the dishes contained in the washing tank. In general, a dishwasher includes a washing tank that forms an exterior and provides a space in which the dishes are placed, a rack located within the washing tank, a rack for placing the dishes, a spray nozzle for spraying the washing water at high pressure on the dishes mounted on the rack, and the washing water is stored. It will include a wash pump for spraying the sump and wash water.

Meanwhile, in the process of washing the dishes, foreign substances such as food debris, which are attached to the surfaces of the dishes, are separated from the surface by the washing water sprayed at a high pressure and are mixed with the washing water. Failure to properly filter out the foreign substances mixed in this way may block the flow path of the washing water or reattach it to the surface of the dishes, which may cause deterioration of cleaning performance. Therefore, a filter for filtering foreign matter mixed in the wash water is mounted on the sump.

Specifically, a part of the washing water sprayed through the washing pump flows into the soil chamber formed inside the sump, and the above-described filter is mounted on the outlet side of the soil chamber so that the foreign matter contained in the washing water is transferred to the filter. Filtering only wash water is reintroduced into the wash bath. In this process, if excessive foreign matter is collected in the soil chamber in excess of the allowable amount, the filter is clogged and foreign matter is not removed.

In addition, whether or not the filter is clogged can be determined by visually checking the inside of the washing tank directly, depending on the user may not be able to check whether the filter is clogged, it may be mistaken for the device.

The present invention has been made to overcome the disadvantages of the prior art as described above, the technical problem to provide a dish washer having a filter clogging detection means that can determine whether the filter for filtering foreign matter.

The present invention also provides a control method of a dish washer to check the state of the filter through the filter clogging detection means as described above to prevent clogging or if the blockage occurs, it is possible to solve this problem. To be.

According to an aspect of the present invention for achieving the above technical problem, a washing tank mounted with a rack is mounted therein; A sump disposed in the washing tank and containing wash water; A washing pump for pumping the washing water in the sump; And a washing nozzle for spraying the washing water toward the dishware, wherein the washing chamber includes a filter for filtering out foreign substances contained in the washing water and a pressure sensing means for measuring pressure therein. And a dishwasher which determines that the filter is clogged when the pressure measured by the pressure sensing means is equal to or greater than a preset pressure.

In the above aspect of the present invention, it is possible to check whether the filter is indirectly blocked through the internal pressure of the soil chamber, which is the space where the filter is installed. In other words, when the filter is clogged, the internal pressure of the chamber is increased as compared with the normal case, so that a pressure sensing means for measuring the pressure is installed inside the chamber so that the blockage of the filter can be determined without visual confirmation. . Here, the pressure sensing means is not necessarily installed in the soil chamber, but may be installed in a predetermined space in which the filter is installed.

Here, the soil chamber is formed so that a portion of the washing water supplied to the nozzle is introduced, the outlet of the soil chamber may be configured to communicate with the interior of the washing tank. The filter may be installed at the outlet.

On the other hand, the pressure sensing means may be installed on the inner wall of the soil chamber to prevent the foreign matter is laminated on the surface to affect the measured pressure.

On the other hand, when it is determined that the filter is clogged, it is possible to lower the discharge pressure of the washing pump. This lowering of the discharge pressure causes fluctuations in the pressure applied to the filter, whereby some of the foreign matter collected in the filter can be separated from the filter to eliminate the filter clogging.

In addition, when it is determined that the filter is clogged, it may be possible to eliminate the clogging of the filter by lowering or raising the discharge pressure regularly or irregularly. If the discharge pressure is changed regularly or irregularly, the filter may vibrate to remove foreign substances.

On the other hand, if the foreign matter is excessively accumulated, even if the foreign matter is removed from the filter, the filter may be clogged immediately. In this case, the operation of the washing pump may be stopped and a part of the washing water may be drained to discharge foreign substances accumulated in the soil chamber to the outside.

According to another aspect of the present invention, the step of measuring the pressure in the soil chamber in which the foreign matter filtered through the filter temporarily stored in the process of washing the dishes; Determining whether the filter is blocked by comparing the measured pressure with a preset pressure; And changing the discharge pressure of the washing pump when the filter is clogged.

Here, in the step of changing the discharge pressure, the discharge pressure may be lowered or the process of changing the discharge pressure regularly or irregularly may be repeated.

In addition, even after the discharge pressure is changed, if the pressure is higher than the set pressure, the foreign material may be excessively accumulated in the soil chamber, and thus, the washing may be stopped and a part of the washing water may be replenished.

In addition, if the pressure is higher than the set pressure even after discharging the washing water, the dishwasher itself may not be able to remove foreign substances or block the filter. Therefore, the washing may be stopped and the filter may be blocked visually or acoustically. Display to inform the user that something is wrong with the filter.

The discharge pressure of the washing pump may be lowered by lowering the rotation speed of the washing motor driving the washing pump.

According to aspects of the present invention having the configuration as described above, since the user can determine whether the filter is clogged by the device itself without visual confirmation, the ease of use is increased. In addition, even if the filter is clogged, it is possible to eliminate to some extent by changing the discharge pressure to minimize the separate maintenance work, it is possible to maintain a constant cleaning performance and improve the reliability of the device.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a dish washing machine having a filter clogging detection means and a control method thereof according to the present invention.

1 is a cross-sectional view showing an embodiment of a dish washing machine according to the present invention. Referring to FIG. 1, a tub 11 and a tub 11 having an outer shape and a washing tank are formed therein. It is formed in the front of the door 18 to open and close the washing tank, and the sump 100 is mounted to the center of the bottom surface of the tub 11, the washing water is stored therein. In addition, the dishwasher 10 is attached to the lower side of the sump 100 by a washing motor 230 for driving a washing pump (not shown) mounted inside the sump 100, by the washing pump A water guide 14 which is a path for pumped washing water to move, a lower nozzle 16 coupled to an upper side of the sump 100 and spraying the washing water upward and / or downward in the washing tank, and the water guide An upper nozzle 15 extending from the one point of the tub 11 toward the center of the tub 11 and connected to an upper end of the water guide 14 and positioned at the ceiling of the tub 11 to wash vertically downwards. It includes a top nozzle 17 for spraying.

In addition, the dishwasher 10 further includes an upper rack 12 positioned directly above the upper nozzle 15, and a lower rack 13 positioned directly above the lower nozzle 16. In detail, the dishes stored in the upper rack 12 are washed with the washing water sprayed from the upper nozzle 15 and the top nozzle 17. The dishes stored in the lower rack 13 are washed with the washing water sprayed from the lower nozzle 16.

Hereinafter, the operation of the dishwasher 10 will be described.

First, the user opens the door 18 of the dishwasher 10, and pulls the upper rack 12 and / or lower rack 13 to the outside of the washing tank. Then, the dishes are stored in the dish racks 12 and 13. Then, close the door 18 and press the operation button to perform the cleaning process.

On the other hand, when the washing step is performed by pressing the operation button of the dishwasher 10, the washing water supplied by the opening of the water supply valve is introduced into the sump (100). Then, after a predetermined amount of washing water flows into the sump 100, the washing motor 230 is operated. Then, the impeller 150 is connected to the motor shaft of the washing motor 230, and the washing water is pumped to the lower nozzle 16 and the water guide 14 by rotating the impeller 150 provided in the washing pump.

In addition, the wash water pumped by the water guide 14 is finally moved to the top nozzle 17 and the upper nozzle 15 is injected into the washing tank. In addition, the dishes stored in the racks 12 and 13 are washed by the sprayed washing water.

Here, the top nozzle 17 sprays the washing water vertically downward, and the upper nozzle 15 sprays the washing water vertically upward, thereby washing the dishes stored in the upper rack 12. In addition, the lower nozzle 16 sprays the washing water vertically upward, thereby washing the dishes stored in the lower rack 13. In addition, by forming an injection hole in the bottom surface of the upper nozzle 15, the washing water is sprayed in both the up and down directions, it can be configured to simultaneously wash the upper side of the tableware accommodated in the lower rack (13).

In addition, the foreign matter generated in the cleaning process is filtered by a filter (not shown) provided in the sump 100, it is crushed finely by a disposer mounted in the sump (100). When the washing process is completed, the contaminated washing water is discharged to the outside of the dishwasher 10 through a drain pump (not shown) together with the foreign matter.

In addition, when the washing water is discharged to the outside, clean washing water is introduced into the sump 100 again through the washing water inlet, and sprayed through the spray nozzles 15 and 16 in the same manner as the washing step. Then, the rinsing step is performed using the clean washing water sprayed. Then, when the rinsing step is completed, the drying process is completed, so that the entire process of washing is completed.

FIG. 2 is a perspective view illustrating the sump 100 in FIG. 1. Referring to FIG. 2, the sump 100 includes a sump case 190 positioned at a lowermost side to store washing water therein, a sump cover 130 covering an upper surface of the sump case 190, and the sump. A filter 120 seated on an upper side of the cover 130, a lower nozzle holder 110 seated at a center of the filter 120 and connected to the lower nozzle 16, and a side surface of the sump case 190. It is attached to the drain pump and drain motor 240 for discharging the washing water to the outside.

In addition, an upper nozzle holder 112 connected to the upper nozzle and the top nozzle is formed at one side of the lower nozzle halter 110, and the washing water sprayed into the tub is introduced into the edge of the sump cover 130. A plurality of washing water inlets 132 are arranged in the circumferential direction.

3 and 4 are perspective views illustrating a flow path guide 140 and a pump lower 170 mounted inside the sump. Referring to FIGS. 3 and 4, the flow path guide 140 is pumped from the washing pump. A flow path is formed to allow the washed water to be transferred to the upper nozzle 15 or the lower nozzle 16.

Specifically, the flow guide 140 is formed in the tangential direction of the washing pump cover 141 and the washing pump cover 141 covering the pump case 171 and the washing water pumped by the washing pump 300 is A guide flow passage 144 is formed to guide the first switching valve 210. One side 145 of the guide passage 144 is in communication with the lower nozzle 16, the other side 146 is in communication with the upper nozzle 15 and the top nozzle 17 to the pumped washing water to each nozzle To be supplied. Reference numeral 143 denotes a valve insertion hole for inserting a variio valve (not shown) for spraying the washing water between the nozzles.

In addition, a sampling flow path 149 is formed adjacent to the valve insertion hole 143, and first and second distribution flow paths 147 and 148 are formed at one side of the sampling flow path 149. The first and second distribution passages 147 and 148 communicate with the soil chamber to be described later, and serve to supply a portion of the pumped wash water to the soil chamber.

The small chamber is formed at one side of the pump lower 170. Specifically, the pump lower 170 is provided with an impeller (not shown) inside the pump case 171 to pump the washing water sucked by the rotation of the impeller, and is provided on the discharge side of the pump case 171. The barrier valve insertion hole 174 is formed. Then, the small chamber 176 is formed along a portion of the edge of the pump lower 170.

The small chamber 176 is divided into two partitions 173 and is divided into a first chamber 176a and a second chamber 176b. One end of the small chamber 176, that is, an end positioned directly below the first distribution channel 147 and the second distribution channel 148 is formed to be lower than the other end. In addition, a first drop hole 177 and a second drop hole 178 are formed at the bottom of the lower end of the small chamber 176. In addition, a drain pump connecting pipe 172 extends on a bottom surface of the pump lower 170 at a portion where the drop holes 177 and 178 are formed. In addition, the drain pump connection pipe 172 is connected to a drain pump (not shown), and the washing water and foreign matter remaining in the soil chamber in the drainage process are provided through the first drop hole 177 and the second drop hole 178. Allow to be discharged to the outside.

By the above configuration, the washing water branched along the sampling flow path 149 of the flow path guide 140 flows through the first distribution flow path 147 and the second distribution flow path 148 and then flows into the soil chamber. . In this process, foreign matters contained in the washing water are also introduced into the soil chamber 176, and the washing water thus introduced flows back into the tub through the filter 120 due to the discharge pressure of the washing pump. The foreign matter is collected inside the soil chamber 176.

Meanwhile, a pressure sensor 175 is installed on the inner sidewall of the soil chamber 176. The pressure sensor 175 measures the internal pressure of the soil chamber 176 to determine whether the filter is clogged. Specifically, as the filter is clogged due to foreign substances, the pressure of the soil chamber is increased when the washing water is pumped. The internal pressure will rise.

Therefore, the pressure applied when the filter is clogged by an appropriate level or more through a preliminary test, and when the pressure exceeds the determined pressure during use is determined to be the case that the filter is clogged. Here, in the above embodiment, only one pressure sensor is provided, but an example in which a plurality of pressure sensors are installed and an average value of the pressures measured from the respective sensors is determined to determine whether or not the blockage is blocked may be considered.

Hereinafter, a process of determining whether the filter is clogged using the pressure sensor and eliminating it will be described.

FIG. 5 is a flowchart illustrating a process of controlling the dishwasher to eliminate filter clogging. Referring to FIG. 5, the pressure measured from the pressure sensor is continuously checked while performing a washing stroke (step S1). Check whether the measured pressure exceeds a predetermined reference pressure (step S2). As a result of the check, when the measured pressure exceeds the reference pressure, the filter is clogged and the discharge pressure of the washing pump is changed (step S3).

At this time, the discharge pressure of the washing pump can be controlled by changing the number of revolutions of the washing motor, the method of changing the discharge pressure is to repeat the regular or irregular to lower the discharge pressure or increase the discharge pressure after lowering the discharge pressure And the like. When the discharge pressure is lowered, the mesh applied to the filter is lowered while the pressure applied to the filter is lowered. When the discharge pressure is repeatedly changed, the mesh network vibrates up and down. In this process, foreign matters stuck between the meshes can be removed.

After separating the foreign matter in this way and compare the measured pressure and the reference pressure again (S4 step). At this time, if too much foreign matter is collected inside the soil chamber, even if the foreign matter is temporarily separated, the foreign matter is caught in the mesh again a little later, so even if the foreign material separation process is repeated, the internal pressure cannot be restored to the normal level. Can be.

Therefore, if the internal pressure does not reach an appropriate level even after performing the foreign matter separation process for a predetermined number or time, the washing stroke is stopped and the drainage pump is operated to drain a part of the washing water and then drain the washing water as much as the drained water. Replenish (step S5). By draining the wash water, foreign matter contained in the wash water is discharged to the outside by the drain pump, so that the inside of the soil chamber can be emptied, and thus filter clogging can be reduced.

After that, the measured pressure is compared again (step S6), and if the measured pressure is equal to or lower than the reference pressure, the filter clogging is eliminated. If not, the filter is removed by the dishwasher itself. In this case, the washing stroke is stopped and the filter is notified to the user through a display window or a warning sound provided in the operation panel (step S8).

On the other hand, if the measured pressure is equal to or less than the reference pressure, go to step S7 to check whether the washing stroke is completed, and if it is still incomplete, return to the step S1 and repeat the above-described process, if completed Will execute the next stroke set.

Here, in the step S8, if the filter clogging is not resolved to end the washing stroke, but is not necessarily limited to this, even if the filter clogging occurs once the washing stroke is completed normally to notify the filter clogging to the user You may.

In addition, an example in which the order of the steps S3 and S5 are reversed may be considered.

1 is a cross-sectional view schematically showing an embodiment of a dishwasher according to the present invention.

FIG. 2 is a perspective view illustrating an appearance of a sump in FIG. 1.

3 is a perspective view illustrating a flow path guide included in the sump of FIG. 1.

4 is a perspective view illustrating a pump lower included in the sump of FIG. 1.

FIG. 5 is a flowchart illustrating an example of a control method of controlling the embodiment illustrated in FIG. 1.

Claims (13)

A washing tank in which a rack on which dishes are mounted is mounted; A sump disposed in the washing tank and containing wash water; A washing pump for pumping the washing water in the sump; And A dish washing machine comprising: a washing nozzle for spraying the washing water toward the dishware. Soil chambers are formed in the sump including a filter for filtering foreign substances contained in the wash water and a pressure sensing means for measuring the pressure therein. And a filter which is determined to be clogged when the pressure measured by the pressure sensing means is equal to or greater than a preset pressure. The method of claim 1, The soil chamber is formed such that a part of the washing water supplied to the nozzle is introduced, the outlet of the soil chamber is in communication with the interior of the washing tank. The method of claim 2, The filter is dishwasher, characterized in that installed in the outlet. The method of claim 2, The pressure sensing means is a dish washer, characterized in that installed on the inner wall of the soil chamber. The method of claim 1, And when the filter is determined to be clogged, lowering the discharge pressure of the washing pump. The method of claim 1, If it is determined that the filter is clogged dishwasher, it characterized in that the discharge pressure of the washing pump is changed repeatedly or regularly. The method of claim 1, And stop the operation of the washing pump and drain a part of the washing water when the filter is determined to be clogged. Measuring the pressure in the soil chamber in which foreign matters filtered through the filter are temporarily stored in the process of washing the dishes; Determining whether the filter is blocked by comparing the measured pressure with a preset pressure; And And changing the discharge pressure of the washing pump when the filter is clogged. The method of claim 8, And in the step of changing the discharge pressure, lower the discharge pressure. The method of claim 8, In the step of changing the discharge pressure control method of the dishwasher, characterized in that for repeating the process of changing the discharge pressure regularly or irregularly. The method of claim 8, The control method of the dishwasher, characterized in that further comprising the step of replenishing after stopping the washing and draining a part of the washing water if the pressure is higher than the set pressure even after changing the discharge pressure. The method of claim 11, And stopping the washing and visually or visually displaying the clogging of the filter when the pressure is higher than the set pressure even after discharging the washing water. The method of claim 8, The discharge pressure of the washing pump is controlled by lowering the number of revolutions of the washing motor for driving the washing pump.

Images