CN100413455C - Overwatering prevention structure and method for dishwasher - Google Patents

Abstract

A structure and method for preventing excessive water supply of a dishwasher. The structure for preventing excessive water supply includes: a buoy meter for detecting the flow rate of washing water flowing into the washing tank; A hall sensor used to output the pulse of the number of revolutions of the buoy gauge; connected with the hall sensor, a microcomputer used to detect the frequency of the pulse; connected with the microcomputer, a drainage pump driven according to the drainage signal issued by the microcomputer; its excessive water supply The prevention method includes: the water supply stage when the washing water flows into the washing tank; the stage of detecting the water supply flow rate by the buoy meter; the stage of judging whether the excessive water supply of the washing water is based on the computer; in the case of excessive water supply, the drainage connected to the computer The pump is driven, thereby forcing the drainage of the stage. In the present invention, when the water supply continues after the washing water reaches the normal water level, the excess washing water can be forcibly discharged.

Description

Overwatering prevention structure and method for dishwasher

technical field

The invention relates to a structure for preventing excessive water supply of a dishwasher and a method thereof.

Background technique

Generally speaking, a dishwasher is a kitchen appliance that sprays high-pressure washing water onto the tableware, automatically removes food residue and other dirt on the tableware, and then dries the tableware.

As shown in Figure 1, the air brake 10 of the existing dishwasher includes the following parts: a water supply hose connection port 11 formed on the bottom surface to allow the tap water supplied by the water pipe to flow in; The buoy gauge 12 for water supply detection of the amount of water; is arranged on the water supply flow path formed in the above-mentioned air brake 10, and is used to prevent the siphon phenomenon of water flowing in after the water supply is interrupted.

In addition, it also includes: a bucket connection port 14 that communicates with the bucket on which the above-mentioned air brake 10 is closely attached, and allows a part of the water flowing into the above-mentioned air brake 10 to flow into the above-mentioned bucket; To the water softener connection port 15 of the water softener.

In addition, it also includes: a regenerator connection port 16 for making part of the water flowing into the above-mentioned air brake 10 flow to a regenerator (not shown in the figure); A storage tank drain connection port 17 that is discharged to the outside and connected to the storage tank; a drain hose for discharging the water flowing to the storage tank drain connection port 17 to the outside through the drain flow path formed in the air brake 10 Connection port 18.

In addition, a drain check valve 19 is attached to the drain connection port 17 of the storage tank. Here, the function of the drain check valve 19 is to prevent the drained washing water from flowing backward.

Next, the function of the above-mentioned air brake 10 will be described.

First, the water flowing in through the water supply hose connection port 11 flows upward through the water supply channel formed in the air brake 10 described above. Then, the supplied water falls to the central part of the air brake 10 and collects at the connection port 15 of the softened water device. Subsequently, the water flows into the softened water device through the connection port 15 of the softened water device, and flows into the storage tank (not shown) through the ion exchange resin filter formed in the softened water device. Thereafter, if the supply of washing water continues, the water inside the air brake 10 will overflow, and a part of the overflowed water will gather in the regenerator connection port 16 formed next to the connection port 15 of the softening water device.

In addition, an air suction port 20 is formed on the periphery of the upper surface of the air brake 10 to allow external air to flow in. In addition, the sucked air communicates with the siphon preventing slit 13 formed on the upper flow path of the air brake 10, so that the siphon phenomenon in which water continues to flow in when the water supply is interrupted can be prevented.

In addition, the washing water concentrated in the connection port 15 of the softening water device will pass through the ion exchange resin filter provided in the softening water device to remove impurities contained in the water, thereby softening the water, and the softened water can be used more easily. Do the washing.

In addition, the washing water after washing will flow to the drain channel through the drain connection port 17 of the sump, and be discharged to the outside of the dishwasher through the drain hose (not shown) connected to the drain hose connection port 18 . In addition, a small amount of washing water collected at the connection port 16 of the regenerator passes through the regenerator to purify the ion exchange resin filter.

In the air brake 10 device as described above, since the inflow flow rate is adjusted using the frequency measured by the number of revolutions of the buoy gauge, an accurate flow rate cannot be measured. Moreover, when the water supply valve or the buoy meter is damaged and the washing water continues to be oversupplied after reaching the normal water level, the existing dishwasher is not provided with a device that can prevent the oversupply of the washing water, so it is difficult to ensure the washing water Bowl machine safety.

Contents of the invention

The main technical problem to be solved by the present invention is to overcome the defects existing in existing dishwashers, and provide a structure and method for preventing excessive water supply of dishwashers. , the excess wash water can be forcibly drained.

The excessive water supply prevention structure of the dishwasher of the present invention is:

A structure for preventing excessive water supply of a dishwasher is characterized in that the structure includes the following parts: a buoy meter for detecting the flow rate of washing water flowing into the washing tank; On the side, a hall sensor for outputting pulses of the number of revolutions of the above-mentioned buoy gauge; connected to the above-mentioned hall sensor, a microcomputer used to detect the frequency of the above-mentioned pulse; connected to the above-mentioned microcomputer, driven according to the drainage signal issued by the above-mentioned microcomputer drain pump.

In the above-mentioned overwater supply prevention structure of the dishwasher, if the frequency of the pulse output from the Hall sensor is the same as the frequency of the pulse at the normal water level stored inside the microcomputer, the microcomputer will send a water supply interruption signal.

In the above-mentioned overwater supply prevention structure of the dishwasher, when the frequency of the pulse output by the Hall sensor is higher than the frequency of the pulse at the normal water level stored inside the microcomputer, the microcomputer will send a drain pump driving signal.

The method for preventing excessive water supply of dishwasher of the present invention is:

A method for preventing excessive water supply of a dishwasher, comprising the following steps: a water supply stage in which washing water flows into a washing tank; a stage in which the flow rate of the water supply is detected by a buoy meter; and a stage in which it is judged whether the above-mentioned washing water is excessively watered or not by a microcomputer ; In the case of excessive water supply, the drainage pump connected with the above-mentioned microcomputer is driven to force drainage; it is characterized in that: the above-mentioned stage of detecting the water supply flow includes: the stage of the impeller rotation of the above-mentioned buoy measuring meter, and the stage close to the The stage where the hall sensor on the outer side of the buoy gauge outputs the pulse of the number of revolutions of the impeller.

In the aforementioned method for preventing overfeeding of dishwashers, the stage of judging whether overfeeding includes: if the pulse frequency output by the Hall sensor is less than the specified frequency, continue to feed water, and when the pulse output from the Hall sensor is At the moment when the frequency is the same as the frequency of the pulse stored in the above-mentioned microcomputer, the above-mentioned microcomputer sends out a water supply interruption signal; after the above-mentioned water supply interruption signal is sent, and continues to output pulses from the above-mentioned Hall sensor, the above-mentioned microcomputer sends a forced drainage Phases of signal and alarm signals.

In the aforementioned method for preventing excessive water supply of the dishwasher, after the water supply interruption signal is sent out, the hall sensor no longer outputs pulses, and then enters the stage of the normal washing process.

Since the present invention can prevent excessive supply of washing water to the inside of the washing tank, the safety of the dishwasher can be ensured.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a sectional view of an air brake in a conventional dishwasher.

Fig. 2 is a schematic cross-sectional view of the dishwasher with the air brake structure of the present invention.

Fig. 3 is a side sectional view of the dishwasher with the empty brake structure of the present invention.

Fig. 4 is a sectional view of the structure of the air brake of the present invention.

Fig. 5 is a schematic plan view of the overwatering prevention structure of the dishwasher of the present invention.

Fig. 6 is a frequency distribution diagram of the flow detection device.

Fig. 7 is a flow chart of the method for preventing overwater supply of the dishwasher of the present invention.

100: Dishwasher 110: Bucket 111: Door

120: Upper grille 130: Lower grille 140: Water guiding device

150: Upper Nozzle 160: Lower Nozzle 170: Storage Tank

180: Washing pump 190: Motor 200: Air brake

210: Water supply hose connection port 220: Buoy 230: Air suction port

240: Bucket connection port 250: Siphon prevention check valve 260: Backflow prevention check valve

300: micro switch 310: contact terminal

Detailed ways

As shown in Figures 2 and 3, the dishwasher 100 with an air brake structure of the present invention includes the following parts: a bucket 110 that forms an appearance and has a dishwashing tank inside; A door 111 for opening and closing the washing tank; a storage tank 170 for storing washing water formed in the central part of the bottom surface of the tub 110 .

In detail, the present invention also includes: an air brake 200 that is attached to the outer surface of the tub 110, delivers the washing water supplied from the water supply device to the storage tank 170, and is equipped with a device for controlling the flow rate of the water supply.

In addition, the present invention also includes: a washing pump 180 connected to the above-mentioned storage tank 170 for high-pressure suction of the washing water stored in the above-mentioned storage tank 170;

In addition, the present invention also includes: a water guiding device 140 as a channel for the flow of washing water sucked from the washing pump 180; it is arranged on the top of the above-mentioned storage tank 170, and is formed on the bottom surface of the above-mentioned washing tank, and sprays washing water to the upper side. The lower spray pipe 160 of water; it is closely attached to the upper side of the above-mentioned water guide device 140, and after being extended from the above-mentioned water guide device 140 to the vertical direction, the upper spray pipe 150 located in the central part of the above-mentioned washing tank; formed on the above-mentioned On the top of the tub, there is a top spray pipe 155 that sprays washing water vertically downward.

In addition, the present invention also includes: the upper grille 120 installed on the upper side of the upper nozzle 150 for washing dishes with the washing water sprayed from the upper nozzle 150; The dishes are washed, and the lower grill 130 is installed on the upper side of the lower spray pipe 160 .

In detail, the upper grill 120 is supported by guide rails (not shown) provided on the inner surface of the barrel 110, and the upper grill can move forward and backward.

Next, the driving process of the dishwasher 100 of the present invention as described above will be described.

First, the user opens the door 111 of the dishwasher 100, and pulls the upper grill 120 and/or the lower grill 130 out of the washing tank. Subsequently, the tableware is placed in the above-mentioned grids 120, 130 again. Then, the door 111 is closed, and power is supplied to drive the dishwasher.

In addition, once power is supplied to the dishwasher 100 and the washing stage starts, the washing water sent from the water supply source will flow through the air brake 200 into the storage tank 170 connected to the air brake 200 with a hose. After a certain amount of washing water flows into the sump, the above-mentioned motor 190 will be driven. Then, an impeller (not shown) that is axially connected to the motor 190 and disposed inside the washing pump 180 rotates to suck washing water into the lower spray pipe 160 and the water guiding device 140 .

In addition, the washing water sucked into the water guiding device 140 finally flows into the top nozzle 155 and the upper nozzle 150, and is sprayed into the washing tub. Then, the dishes accommodated in the grills 120 and 130 are washed with the sprayed washing water.

Here, the top nozzle 155 sprays the washing water vertically downward, and the upper nozzle 150 sprays the washing water vertically upward, so that the tableware accommodated in the upper grill 120 can be washed.

In addition, the lower spray pipe 160 sprays washing water vertically upward, so that the dishes accommodated in the lower grill 130 can be washed. In addition, spray ports are also formed on the bottom surface of the upper spray pipe 150, so that washing water can be sprayed in both directions up and down, so that the upper side of the tableware accommodated in the lower grill 130 can be washed at the same time.

In addition, once the above-mentioned washing process is finished, the polluted washing water concentrated into the above-mentioned storage tank 170 will pass through a filter (not shown in the figure) to filter out foreign matter. The washing water from which the foreign matters are filtered out will be discharged to the outside of the dishwasher 100 through a drain pump (not shown in the figure).

In addition, once the washing water is discharged to the outside, clean washing water flows into the storage tank 170 again through the inlet, and is sprayed out through the spray nozzles 150 and 160 as in the washing stage. The dishwasher will use the sprayed clean washing water to clean the tableware.

Once the above cleaning process is over, it will go through the drying process and finally complete the washing work.

As shown in FIG. 4 , the air brake 200 of the present invention is closely attached to the outer surface of the bucket 110 . The function of the air brake 200 is to deliver the washing water to the storage tank 170 provided on the bottom surface of the tub 110 .

In detail, the above-mentioned air brake 200 includes the following parts: an air suction port 230 with a certain size opening on the upper periphery, so that indoor air can be sucked in; Water supply hose connection port 210; Water supply channel 213 through which washing water flowing in through the water supply hose connection port 210 flows.

In addition, it also includes: a float meter 211 located at the end of the water supply flow path 213 and rotating due to the action of washing water to detect the flow rate; formed in the approximate center of the air brake 200 and penetrating through the side of the tub 110, thereby The washing tub air inlet 240 communicates the inside of the washing tub with the air inlet 230 .

In detail, the shape of the water supply channel 213 is roughly an inverted U-shape that is vertical from the lower part to the upper part, bends at a certain height, and then reconnects to the lower part. In addition, the above-mentioned buoy meter 211 is provided at the end of the above-mentioned water supply flow path. In addition, the washing water inlet 214 of the buoy meter 211 is formed upward so that the impeller formed inside the buoy meter 211 can be rotated by the force of the washing water falling freely.

As mentioned above, the reason why the shape of the water supply channel 213 is an inverted U shape and the washing water inlet 214 of the above-mentioned float meter 211 is formed upward is because, generally speaking, the float meter cannot detect 0.5 Low water pressure of kg/ ^cm2 . Therefore, in order to accurately detect the flow rate of the water supply under the condition of very low water pressure, in the present invention, even if a small amount of washing water flows in, the buoy gauge 211 can be adjusted according to the weight of the washing water flowing in. impeller rotation.

In more detail, the present invention also includes: in order to prevent the noise generated inside the washing tank from being transmitted to the outside through the air suction port 230, a second section extended from the upper side of the air brake 200 by a certain length and inclined at a certain angle is formed. 1 air guide wall 231. In addition, it also includes: being in contact with the outer peripheral surface of the air suction port 240 of the washing tub, and being inclined at a certain angle, so that the air suction flow path from the air suction port 230 to the air suction port 240 of the washing tub is roughly S-shaped. The second air guide wall 232.

In addition, the air brake 200 of the present invention further includes: a washing water outflow port 215 and a storage tank water supply connection port 212 . Here, the function of the washing water outlet 215 is to discharge the washing water that rotates the impeller in the float gauge 211 through the washing water inlet 214 . The role of the storage tank water supply connection port 212 is to serve as an inlet for the washing water passing through the washing water outlet 215 to flow into the storage tank 170 .

In addition, the present invention also includes: in order to detect the rising water level of the washing water flowing into the storage tank 170 through the water supply connection port 212 of the storage tank, a buoy 220 located at the upper end of the water supply connection port 212 of the storage tank; The side part is the buoy rod 221 that rises or falls together with the rise or fall of the above-mentioned buoy 220; the buoy box that accommodates the above-mentioned buoy 220 and can make the above-mentioned buoy 220 reciprocate up and down; is formed on the upper side of the above-mentioned buoy rod 221 The part is a micro switch 300 for detecting overflow water level.

In addition, the present invention also includes: in order to arrange the above-mentioned buoy rod 221 and the above-mentioned buoy 220 with a certain gap, and support the buoy rod support wall 222 of the above-mentioned buoy rod 221; , and the buoy rod penetration groove 223 formed in the above buoy rod support wall 222 .

In detail, as shown in FIG. 4, the above-mentioned buoy 220 is arranged on the water supply flow path, so the pollutants close to the lower part of the above-mentioned buoy 220 can be automatically cleaned, thereby preventing the phenomenon of false detection of the water level in the washing tank. .

In addition, a contact terminal 310 protruding by a certain length and coming into contact with the upper end of the float rod 221 is formed on the lower end of the micro switch 300 . Once the water level in the washing tank reaches the limit line, the upper end of the float rod 221 pressurizes the contact terminal 310 . Once the contact terminal 310 is pressurized, the supply of washing water flowing into the dishwasher 100 is interrupted, or the drain pump is driven, thereby preventing water leakage accidents caused by excessive water supply.

More specifically, the washing water supplied into the storage tank 170 is heated to a certain temperature by a heater installed in the storage tank 170 . In addition, in order to prevent the water vapor generated in the heated washing water from being transmitted to the micro switch 300, causing erroneous driving or electrical problems, and in order to be able to easily deal with the variation of the water level limit line of different product models, the above-mentioned buoy 220 and the above-mentioned buoy rod 221 was formed separately. In other words, when the dishwasher is normally driven, the float rod 221 can block the float rod through groove 223 , thus preventing water vapor from being transmitted to the micro switch 300 . In addition, because there is a gap between the upper side of the buoy 220 and the lower end of the buoy rod 221 , the specification of the buoy 220 can be flexibly dealt with according to the capacity of the dishwasher.

In addition, the present invention also includes: formed on the bottom surface of the above-mentioned air brake 200, the storage tank drain connection port 261 that allows the polluted washing water sucked by the drain pump (not shown in the figure) to flow into; A drain flow path 263 through which washing water flows through the port 261; and a drain hose connection port 262 formed at the end of the drain flow path and connected to a drain hose.

In addition, the present invention also includes: a siphon prevention check valve 250 installed on the upper side of the drainage channel 263 to prevent the siphon phenomenon in which the washing water continues to be discharged through the drainage channel 263 after the drainage is interrupted; The backflow prevention check valve 260 is used to prevent the wash water that originally flows through the drain flow path 263 through the sump drain connection port 261 from flowing back to the drain pump again due to the interruption of the drain.

Specifically, the siphon prevention check valve 250 is accommodated in a check valve housing box 254 having a certain size. In addition, a drain pipe communication hole 252 having a certain size is formed on the upper side of the drain channel 263 . In addition, the upper side wall of the housing box 254 for the anti-siphon check valve 250 is formed with a support shaft penetration groove 251 through which the check valve support shaft 253 protruding from the anti-siphon check valve 250 penetrates.

More specifically, part of the air flowing in through the air suction port 230 flows into the check valve housing box 254 through the support shaft through groove 251 . In addition, the air flowing into the check valve housing box 254 flows into the drain channel 263 through the drain communication hole 252 . In addition, the siphon preventing one-way valve 250 is made of rubber material that is easy to float on water, and its upper end is tapered so as to completely seal the support shaft through groove 251 .

Next, the working process and functions of the air brake 200 will be described in detail.

First, regardless of whether the dishwasher 100 is driven or not, the air flowing in through the air inlet 230 flows in and out through the air inlet 240 of the washing tub. In addition, once power is supplied to the dishwasher 100 , water flows in through the water supply hose connection port 210 , and the inflowing water flows through the water supply flow path 213 . In addition, the wash water flowing through the water supply flow path 213 falls to rotate an impeller mounted in the float gauge 211 . In addition, the rotation frequency of the number of rotations of the impeller is transmitted to the control unit of the dishwasher 100 so that the amount of inflowing water supply can be determined.

In addition, as the water level of the washing water flowing into the storage tank 170 rises, the float 220 also rises at the same time. In addition, as the buoy 220 rises, the buoy rod 221 located on the upper side of the buoy 220 also rises together. Once the float rod 221 pressurizes the contact terminal 310 of the micro switch 300, the micro switch 300 can detect it and transmit the detected signal to the control part of the dishwasher 100. Due to the signal, the water supply operation will interruption.

In addition, after the washing process is finished, in order to discharge the washing water containing food residues, the drain pump will be driven. Due to the driving of the drain pump, the sucked washing water will flow in through the above-mentioned storage tank drain connection port 261 . Then, the washing water flows to the drain hose connection port 262 through the drain flow path 263 , and is finally discharged to the outside through the drain hose connected to the drain hose connection port 262 .

In addition, part of the washing water flowing through the drain channel 263 leaks into the drain communication hole 252 due to the hydraulic pressure. Then, the leaked washing water flows into the check valve housing tank 254, and the siphon prevention check valve 250 rises due to the inflowing washing water. In addition, when the anti-siphon check valve 250 is raised, the upper side portion of the anti-siphon check valve formed in a tapered shape blocks the support shaft penetration groove 251 .

In addition, after the drainage is interrupted, the amount of washing water flowing in the drainage channel 263 will decrease, and the washing water filled in the check valve housing box 254 will be discharged through the drain pipe communication hole 252 . In addition, the anti-siphon check valve 250 is also lowered together, so that the support shaft through-groove 251 is opened. In addition, the outside air flowing in through the air inlet 230 flows into the drain flow path 263 through the support shaft through groove 251 , the check valve housing box 254 , and the drain pipe communication hole 252 . As a result, the drainage channel 263 is filled with air due to the inflowing air, so that no siphon phenomenon occurs during drainage.

As shown in Fig. 5 and Fig. 6, the overwater supply prevention structure of the dishwasher of the present invention includes the following parts. Float meter 211: the inside of the above-mentioned buoy meter is provided with an impeller 400 that rotates due to the action of washing water falling along the water supply flow path;

In addition, it also includes: a Hall sensor 600 for detecting pulses generated by the rotation of the above-mentioned magnet 500; connected to the above-mentioned Hall sensor 600, by calculating the frequency of the output waveform transmitted in the above-mentioned Hall sensor 600, the flow rate is controlled microcomputer 700; a drain pump 800 that is connected to the microcomputer 700 and discharges washing water when outputting a waveform of a predetermined frequency or higher.

Next, the above-mentioned overwatering prevention device will be described in detail.

First, the wash water flowing down the water supply channel contacts the impeller 400 to rotate the impeller 400 . As the impeller 400 rotates, the magnet 500 closely attached to the rotation shaft of the impeller 400 also rotates together. In addition, the Hall sensor 600 detects a change in the magnetic field generated by the magnet 500 and generates a pulse P. And, the pulse P generated from the Hall sensor 600 is transmitted to the microcomputer 700, and the microcomputer 700 measures the frequency of the pulse P.

In detail, the frequency of the pulse P corresponds to the number of rotations of the impeller 400, therefore, the microcomputer 700 compares the frequency of the pulse with the frequency of the pulse stored in the microcomputer. More specifically, the reason for comparing and judging the pulse frequency with the pulse frequency stored in the microcomputer is that the flow rate of feed water is determined by the number of rotations of the impeller 400 .

In addition, if the frequency of the pulse P sent to the microcomputer 700 exceeds the frequency of the pulse P stored in the microcomputer, it is judged as overwatering, and the drain pump 800 connected to the microcomputer 700 is driven. Therefore, the excessively supplied washing water is discharged to the outside by the drain pump 800, so that the inside of the washing tub can be maintained at a normal water level.

As shown in FIG. 7 , the method for preventing excessive water supply of a dishwasher according to the present invention includes the following stages: a wash water inflow stage ST110; a stage ST120 in which the above-mentioned impeller is rotated by the action of the above-mentioned inflow of wash water; Stage ST130 of detecting the output pulse of the hall sensor attached to the magnet of the impeller; stage ST140 of comparing and judging the above-mentioned output pulse and the stored pulse in the microcomputer; after the stored pulse is output, it is judged whether there is a pulse to continue to output Stage ST160.

In detail, in the microcomputer 700, after comparing and judging the frequency of the pulse stored in the microcomputer 700 and the frequency of the output pulse, if the frequency of the output pulse is the same as the frequency of the specified pulse, it will enter the water supply interruption. Signal stage ST150. Conversely, if the output pulse frequency is lower than the predetermined pulse frequency, water supply is continued. Here, the stage ST150 of sending the water supply interruption signal can be compiled as the following program: send the water supply interruption signal from the above-mentioned microcomputer, and close the water supply valve, so that the washing water can no longer flow in through the water supply valve.

In addition, after the water supply is interrupted, the above-mentioned microcomputer will continue to detect whether the pulse continues to be output, and if the pulse is no longer output, it will normally enter the washing process ST180. However, if the microcomputer 700 outputs the water supply interruption signal, but there is still a continuous output of pulses, the microcomputer 700 will judge that the water supply valve is faulty, and enter the forced drainage stage ST170 of sending a drainage pump driving signal. Furthermore, the above-mentioned microcomputer 700 can also send out an alarm signal such as an alarm sound or an alarm message that can be perceived by the user while sending out the above-mentioned drainage pump driving signal.

In detail, the drain pump 800 is driven by the command of the microcomputer 700 to discharge the excessively supplied washing water to the outside of the washing tub, so that the inside of the washing tub can always maintain a normal water level.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.

The effect of the invention

The overwatering prevention structure and method of the dishwasher of the present invention have the effect of ensuring the safety of the dishwasher because it can prevent overwatering of the washing water inside the washing tub.

In addition, when the washing water is still supplied after reaching the normal water level due to damage to the water supply valve, the excess washing water can be forcibly discharged, thereby avoiding the occurrence of excessive water supply.

Claims (6)

1. A kind of excessive water supply prevention structure of dishwasher, it is characterized in that: The structure consists of the following parts: A buoy gauge for detecting the flow of wash water flowing into the inside of the wash tank; a Hall sensor for outputting pulses of the number of revolutions of the buoy gauge, which is attached to the outer side of the buoy gauge; A microcomputer connected with the above-mentioned Hall sensor for detecting the frequency of the above-mentioned pulse; It is connected with the above-mentioned microcomputer, and the drain pump is driven according to the drainage signal sent from the above-mentioned microcomputer. 2. The excessive water supply preventing structure of the dishwasher according to claim 1, characterized in that: If the frequency of the pulse output from the above-mentioned Hall sensor is the same as the frequency of the pulse under the normal water level stored inside the above-mentioned microcomputer, the above-mentioned microcomputer will send a water supply interruption signal. 3. The excessive water supply prevention structure of the dishwasher according to claim 1, characterized in that: When the frequency of the pulse output by the Hall sensor is greater than the frequency of the pulse stored in the microcomputer at a normal water level, the microcomputer will send a drainage pump driving signal. 4. A method for preventing overfeeding of a dishwasher, comprising the following stages: The feed water stage where the washing water flows into the inside of the washing tank; The stage of detecting the feedwater flow rate according to the buoy gauge; The stage of judging whether the above washing water is excessively fed or not according to the computer; In the case of excessive water supply, the drainage pump connected to the above-mentioned microcomputer is driven, thereby forcing the drainage stage; Its characteristics are: The stage of detecting the flow rate of feed water includes: a stage in which the impeller of the buoy meter rotates, and a stage in which a hall sensor closely attached to an outer side of the buoy meter outputs a pulse of the number of revolutions of the impeller. 5. The method for preventing excessive water supply of the dishwasher according to claim 4, characterized in that: The stage of judging whether there is excessive water supply includes: if the pulse frequency output by the Hall sensor is less than the specified frequency, continue to supply water, and the frequency of the pulse output from the Hall sensor is the same as the frequency of the pulse stored in the microcomputer At the moment of , the stage where the above-mentioned microcomputer sends a water supply interruption signal; After the above-mentioned water supply interruption signal is sent, the stage where the above-mentioned microcomputer sends out a forced drainage signal and an alarm signal when the pulses are still output from the above-mentioned Hall sensor. 6. The method for preventing excessive water supply of the dishwasher according to claim 5, characterized in that: After the above-mentioned water supply interruption signal is sent out, in the case that the above-mentioned Hall sensor no longer outputs pulses, it enters the stage of the normal washing process.

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