KR19980056370A - Drainage control device of water purifier - Google Patents

Abstract

The present invention relates to a wastewater control device for a water purifier, and purified water through a plurality of filters, and then purified and heated to cool and supply hot water and cold water to supply hot water and cold water tank (3), cold water tank (7) and hot water tank ( In the water purifier having 9), the control means 110 for controlling the drainage operation of the purified water in the tank (3, 7, 9) by counting the power supply time of the water purifier, and the control of the control means (110) In accordance with the predetermined time is composed of a drain valve driving means 126 for driving the drain valve 127 to drain the purified water in the tank (3, 7, 9), the tank (3, 7, 9) It automatically drains the water inside to prevent microbial propagation, so it is possible to take clean purified water even during long-term storage of purified water.

Description

Drainage control device of water purifier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purifier that generates cold and hot water after purifying harmful contaminants contained in raw water such as tap water and the like, and more particularly, to a water control device for a water purifier that automatically drains old water in a tank.

In general, the water purifier removes harmful carcinogens contained in raw water, such as tap water, and supplies purified water. According to the water purification method, the water purifier is classified into natural filtration, direct filtration, ion exchange resin, and reverse osmosis. You can share it.

Among them, the reverse osmosis type applies pressure to raw water and passes water through a membrane (reverse osmosis filter), which is an artificial osmosis membrane, to remove water, heavy metals, bacteria, carcinogens, etc. contained in raw water, and at the same time, pure water and dissolved oxygen. Since only the back can supply clean water, it is used for the cutting-edge science industry or for washing high-precision electronic components, or for medical purposes. In recent years, it has been widely used in household water purifiers for drinking water.

As shown in Figs. 1 and 2, the conventional reverse osmosis water purifier includes a water purification chamber 5 installed above the main body 1 so that the purified water tank 3 storing the filtered purified water is seated thereon, A cold and hot water chamber 11 in which a cold water tank 7 and a hot water tank 9 are installed below the water purifying chamber 5 to heat and cool the purified water introduced from the purified water tank 3 to store cold water and hot water; A filtration chamber 13 in which a plurality of filters are installed to remove and filter harmful contaminants contained in raw water, such as tap water flowing from an unshown tap, and a freezing cycle to cool the purified water in the cold water tank 7. It consists of a mechanical chamber (15) provided with various refrigerant means and blowing means for forming a water, and a water intake lever (17) installed on the front surface of the main body (1) to take in purified water in the cold water tank (7) and the hot water tank (9). It is.

The float sensor 102 is installed inside the purified water tank 3 to detect the amount of purified water in the purified water tank 3 in multiple stages.

In the filtration chamber 13, a charging filter 21 is installed to remove suspended substances and green debris contained in raw water such as tap water flowing from the tap water, and at one side of the charging filter 21. A pretreatment filter 23 is provided to remove various harmful organic compounds such as chlorine components contained in raw water passing through the passage 21, and one side of the pretreatment filter 23 passes through the pretreatment filter 23. Membranes 25 and 27 are provided with a plurality of membrane membranes not shown inside to remove bacteria such as various heavy metals, carcinogens and bacteria in raw water, and one side of the membranes 25 and 27 is provided. The post-treatment filter 29 which removes odor components, such as toxic gas contained in the raw water which passed the 25 and 27, is provided.

Under the precipitation filter 21, the pretreatment filter 23, the membranes 25 and 27 and the aftertreatment filter 29, raw water such as tap water is irradiated with ultraviolet rays when the raw water passes through the plurality of filters to be contained in the raw water. UV filter 31 is installed to sterilize harmful bacteria, and the raw water flowing into the membrane 25 and 27 through the pretreatment filter 23 under the UV filter 31 has a predetermined pressure. A pressurizing pump 33 is provided to boost the pressure of the raw water flowing into the membranes 25 and 27 to a predetermined pressure so that the membranes 25 and 27 can be purified by reverse osmosis.

In the machine room 15, a compressor 35 for compressing a low-temperature low-pressure gas refrigerant into a high-temperature high-pressure gas state is provided. On one side of the compressor 35, a high-temperature high-pressure compressed by the compressor 35 is provided. Condenser (37) is installed to liquefy the gas refrigerant by natural convection or forced convection with external air and forced cooling into liquid refrigerant of low temperature and high pressure. One side of the condenser (37) is condenser (37). Fan 41 which rotates as the fan motor 39 is driven to circulate air around the compressor 35 and the condenser 37 to liquefy the refrigerant passing through the same and to cool the compressor 35. ) Is installed.

In addition, inside the cold water tank 7 of the cold / hot water chamber 11, an evaporation tube 43 is provided to evaporate the refrigerant flowing therein by the latent heat of evaporation of the refrigerant to cool the purified water in the cold water tank 7. In addition, a water intake pipe 45 is connected to one side of the cold water tank 7 so that the cold water stored in the cold water tank 7 is collected through the water intake lever 17.

In addition, a heater 47 for heating the purified water in the hot water tank 9 is installed in the hot water tank 9 of the cold / hot water chamber 11, and the hot water tank 9 is provided on one side of the hot water tank 9. Intake pipe 49 is connected to take in the hot water stored in the through the intake lever 17.

On the other hand, the inside of the main body 1 is partitioned into partitions 10, 12 and 14 into the water purification chamber 5, the cold and hot water chamber 11, the filtration chamber 13 and the machine chamber 15.

On the other hand, reference numeral 19 is a drip tray member installed on the lower side of the intake lever 17 to accommodate the remaining water falling in accordance with the operation of the intake lever 17.

In the water purifier configured in this way, if the water level of the water purification tank 3 is lower than or equal to the low water level, raw water such as tap water starts to be supplied from the tap water while the water supply valve (not shown) is opened.

As the water supply valve 81 opens, the raw water supplied from the tap water passes through the settling filter 21 to remove suspended substances and debris, and the raw water passing through the charging filter 21 is a pretreatment filter 23. Various harmful organic compounds such as chlorine are removed while passing through.

The raw water passing through the pretreatment filter 23 is boosted to a predetermined pressure according to the driving of the pressure pump 33 to pass through the membranes 25 and 27, and the raw water introduced into the membranes 25 and 27 is the membrane. Various heavy metals, carcinogens, bacteria and the like contained in the raw water are removed while passing through a plurality of membrane membranes formed in (25, 27).

The raw water passing through the membranes 25 and 27 passes through the post-treatment filter 29 to remove odors such as toxic gases, and then is supplied into the purified water tank 3 through a water supply hole (not shown). (7) and flows into the hot water tank (9) and stored.

At this time, when the compressor 35 and the fan motor 39 are driven, the refrigerant compressed in a gas state of high temperature and high pressure by the compressor 35 flows into the condenser 37 and the natural convection of the external air or the fan 41 It is heat exchanged by the forced convection phenomenon by rotation to cool and liquefy with a low temperature and high pressure refrigerant, and the low temperature and high pressure liquid refrigerant liquefied in the condenser 37 passes through a capillary tube (not shown) and is a low temperature low pressure free refrigerant. It is reduced in pressure to flow into the evaporation tube (43).

Therefore, in the evaporation tube 43, when the low-temperature low-pressure free refrigerant reduced in the capillary tube is evaporated and vaporized while passing through several pipes, the purified water in the cold water tank 7 is cooled and changed into cold water. By the heat of 47, the purified water in the hot water tank 9 is heated and changed into hot water.

In addition, the cold water and the hot water stored in the cold water tank 7 and the hot water tank 9 are discharged through the water inlet according to the operation of the water intake lever 17 to enable the water intake.

On the other hand, if the user wants to drain the purified water in the tank (3,7, 9) by smell or foreign matter occurs in the cold water or hot water is intake, it is shown when operating the drain switch attached to a predetermined position of the main body (1) If the drain valve is not opened, the purified water in the tanks 3, 7, 9 is drained.

However, in such a conventional water purifier, even if the water in the tanks 3, 7 and 9 is not taken for a long time, even if the purified water is contaminated due to the growth of microorganisms and bacteria, the user cannot confirm this, and the water is manually drained. Because of the need to drink contaminated water as it is hygiene problems are emerging.

Therefore, the present invention has been made to solve the above problems, it is possible to prevent the intake of contaminated water because it prevents microbial propagation by automatically draining the water in the tank after a certain time has elapsed, the long-term storage of purified water The purpose of the present invention is to provide a drainage control device for a water purifier that can always take clean water.

In order to achieve the above object, the control device for drainage of a water purifier according to the present invention includes a purified water tank, a cold water tank, and a hot water tank to supply hot water and cold water by heating and cooling the raw water being passed through a plurality of filters. In the water purifier, a control means for countering the power supply time of the water purifier to control the drainage operation of the purified water in the tank, and a drain valve for driving the drain valve to drain the purified water in the tank at a predetermined time according to the control of the control means. Characterized in that the valve drive means.

1 is a longitudinal sectional view schematically showing a conventional water purifier;

2 is a cross-sectional view taken along the arrow A-A of FIG.

3 is a control block diagram of an apparatus for controlling drainage of a water purifier according to an embodiment of the present invention;

4A to 4C are flowcharts showing the drainage control operation procedure of the water purifier according to the present invention;

* Explanation of symbols for main parts of the drawings

3: water purification tank 5: water purification chamber

7: cold water tank 9: hot water

11: cold and hot water chamber 13: filtration chamber

15: machine room 21: settling filter

23: pretreatment filter 25, 27: membrane

29: post treatment filter 31: UV filter

33: pressure pump 35: compressor

37: condenser 39: fan motor

43: evaporation tube 47: heater

100: power supply means 102: water level detection means

104: key input means 105: temperature setting switch

107: drain switch 109: power switch

110: control means 112: cold water temperature detection means

114: hot water temperature sensing means 116: pump driving means

118: water supply valve drive means 119: water supply valve

120: compressor driving means 122: motor driving means

124: heater driving means 126: drain valve driving means

127: drain valve 128: display means

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The water purifier according to the present invention is the same as the conventional configuration shown in Figs. 1 and 2, and thus redundant description is omitted.

As shown in Fig. 3, the power supply means 100 converts a commercial AC voltage supplied from an AC power supply terminal (not shown) into a predetermined DC voltage required for the operation of the water purifier, and outputs the water level detecting means 102. It is a float sensor that detects the water level of the purified water supplied to and stored in the purified water tank 3, that is, the purified water tank 3.

In addition, the key input means 104 is a temperature setting switch 105 for setting the temperature (Tcs, Ths) of the cold or hot water stored in the cold water tank (7) and hot water tank (9), and the tank (3, And a drain switch 107 for draining the purified water in 7, 9 and 9, and a power switch 109 for controlling the power of the water purifier on / off.

The control unit 110 receives the DC voltage output from the power supply unit 100 and initializes the water purifier, and receives the water level detection signal sensed by the water level detecting unit 102. As a microcomputer for controlling the operation, the control means 110 counters the time by a built-in timer, and drains the purified water in the tanks 3, 7, 9 every fixed time (about 2 to 3 days). To control.

In addition, the cold water temperature detection means 112 is a temperature sensor for detecting the temperature (Tc) of the cold water stored in the cold water tank (7) and outputs it to the control means 110, the hot water temperature detection means 114 is the hot water It is a temperature sensor for sensing the temperature (Th) of the hot water stored in the tank (9) and output to the control means (110).

In addition, the pump driving means 116 is output from the control means 110 to supply water into the purified water tank 3 according to the level of the purified water tank 3 sensed by the water level detecting means 102. Receiving a control signal to drive control of the pressure pump 33, the water supply valve driving means 118 is raw water supplied from the tap water in accordance with the water level of the purified water tank (3) sensed by the water level sensing means (102) Drive control of the water supply valve 119 by receiving a control signal output from the control means 110 to supply or cut off.

The compressor driving means 120 is a difference between the cold water set temperature Tcs set by the temperature setting switch 105 of the key input means 104 and the cold water temperature Tc sensed by the cold water temperature sensing means 112. In response to the control signal output from the control means 110 to drive control the compressor 35 to cool the purified water in the cold water tank (7), the motor driving means 122 is the key input means 104 The control signal output from the control means 110 according to the difference between the cold water set temperature (Tcs) set by the temperature setting switch 105 of the cold water temperature (Tc) detected by the cold water temperature detection means 112 The fan 41 is driven by controlling the rotation speed of the fan motor 39 to cool the compressor 35 while simultaneously blowing the heat exchanged heat from the condenser 37 to the outside.

Also, in the drawing, the heater driving means 124 is the hot water set temperature Ths set by the temperature setting switch 105 of the key input means 104 and the hot water sensed by the hot water temperature sensing means 114. The heater 47 is driven to control the heater 47 to heat the purified water in the hot water tank 9 in response to the control signal output from the control means 110 according to the difference of the temperature Th, and the drain valve driving means 126 is When the time counted by the control means 110 passes a predetermined time (about 2 to 3 days), the control to drain the purified water in the purified water tank 3, the cold water tank 7 and the hot water tank 9 The solenoid valve 127 (hereinafter referred to as a drain valve) is drive controlled by receiving the control signal output from the means 110.

The display means 128 displays the set temperature (Tcs, Ths) of cold water or hot water according to the key signal input by the key input means 104, as well as the drainage operation of the tank (3, 7, 9) Is displayed.

Hereinafter, the effect of the drain control device of the water purifier configured as described above will be described.

A to 4C are flowcharts showing the drainage control operation procedure of the water purifier according to the present invention, in which S denotes a step.

First, when power is applied to the water purifier, the power supply means 100 converts a power supply voltage of a commercial AC power supplied from an AC power input terminal (not shown) into a predetermined DC voltage required for driving the water purifier, and thus drives circuits and control means. Output to 110. Accordingly, in step S1, the DC voltage output from the power supply means 100 is inputted from the control means 110 to initialize the water purifier. In step S2, the cold water and hot water selection switch of the key input means 104 is turned off. After selecting the cold water and hot water by the operation, the temperature setting switch 105 is operated to set the cold water temperature and hot water temperature (Tcs, Ths) desired by the user.

At this time, the display means 128 displays the cold water set temperature Tcs and the hot water set temperature Ths set by the key input means 104 under the control of the control means 110.

Subsequently, when the operation switch of the key input means 104 is turned on, in step S3, the water level of the purified water tank 3 that stores the purified water, that is, the water level of the purified water tank 3, is detected by the water level detecting means 102. The detected water level data is output to the control means 110.

Accordingly, the control means 110 determines whether the water level of the purified water tank 3 sensed by the water level detecting means 102 is equal to or lower than the low water level (lowest water level; assuming that the water level is 100%, about 10%). .

As a result of the discrimination in step S3, when the water level of the purified water tank 3 is not equal to or lower than the low water level (NO), the control means (step S4) performs a water purifying operation for supplying purified water into the purified water tank 3; 110 outputs a control signal for opening the water supply valve 81 to the water supply valve driving means 118.

Therefore, the water supply valve driving means 118 supplies the power voltage applied to the water supply valve 81 under the control of the control means 110 to open the water supply valve 81.

When the water supply valve 81 is opened, raw water such as tap water starts to be supplied from the tap water, and in step S5, the control unit 110 supplies the raw water introduced from the tap water to the membranes 25 and 27 by a predetermined pressure. A control signal for driving the pressure pump 33 is output to the pump driving means 116 to boost the pressure.

Accordingly, the pump driving means 116 receives the control signal output from the control means 110 and supplies the power voltage applied to the pressure pump 33 to drive the pressure pump 33.

When the pressure pump 33 is driven, in step S6 as the raw water supplied from the tap water passes through the settling filter 21 in accordance with the opening of the water supply valve 81, suspended matter and debris are removed, and the charging filter ( The raw water passing through 21 is passed through the pretreatment filter 23 to remove various harmful organic compounds such as chlorine.

The raw water passing through the pretreatment filter 23 is boosted to a predetermined pressure according to the driving of the pressure pump 33 to pass through the membranes 25 and 27, and the raw water introduced into the membranes 25 and 27 is the membrane. Bacteria such as various heavy metals, carcinogens and bacteria contained in raw water are removed while passing through a plurality of membrane membranes formed in (25, 27).

The raw water passing through the membranes 25 and 27 passes through the post-treatment filter 29 to remove odors such as toxic gases, and is then supplied into the purified water tank 3 through a water supply hole (not shown). ) And is introduced into the hot water tank (9) and stored.

Meanwhile, the UV filter 31 irradiates the raw water passing through the precipitation filter 2l, the pretreatment filter 23, the membranes 25 and 27, and the aftertreatment filter 29 to remove harmful bacteria contained in the raw water. Sterilize.

Subsequently, in step S7, the water level sensing means 102 detects the purified water amount supplied to the purified water tank 3, that is, the water level of the purified water tank 3 during the water purification operation in step S6, and controls the detected water level data. When output to the means 110, the control means 110 determines whether the water level of the purified water tank 3 sensed by the water level detecting means 102 is more than the low water level.

As a result of the discrimination in step S7, when the water level of the purified water tank 3 is not equal to or lower than the low water level (NO), the purified water must be continuously supplied to the purified water tank 3, and the flow returns to the step S6 to perform the purified water operation. While performing, the operation below Step S6 is repeatedly performed.

On the other hand, when the determination result in the step S7, when the water level of the purified water tank 3 is above the low water level (YES), in step S8 to cool and heat the purified water stored in the cold water tank 7 and the hot water tank 9 The control means 110 outputs a control signal for driving the compressor 35 and the heater 47 to the compressor driving means 120 and the heater driving means 124 and at the same time to drive the fan motor 39. One control signal is output to the motor driving means 122.

Accordingly, the compressor driving means 120 drives the compressor 35 under the control of the control means 110, and the heater driving means 124 drives the heater 47 under the control of the control means 110. The motor driving means 122 drives the fan motor 39 under the control of the control means 110.

When the compressor 35 and the fan motor 39 are driven, the refrigerant compressed in the gas state at high temperature and high pressure by the compressor 35 flows into the condenser 37 and the natural convection with the external air or the fan 41 Heat exchanged by forced convection by rotation, cooled with low temperature and high pressure refrigerant to liquefy.

The low-temperature high-pressure liquid refrigerant liquefied in the condenser 37 is passed through a capillary tube (not shown) and decompressed into a low-temperature, low-pressure free refrigerant to be introduced into the evaporation tube 43.

Accordingly, in the evaporation tube 43, when the low-temperature low-pressure free refrigerant reduced in the capillary tube is evaporated and vaporized while passing through several pipes, the purified water in the cold water tank 7 is cooled, and the evaporation tube 43 The low-temperature, low-pressure gas refrigerant cooled by) is again sucked into the compressor 35 to form a recirculating refrigeration cycle.

According to the repetitive circulation operation of the refrigeration cycle as described above, the purified water in the cold water tank 7 is cooled and changed into cold water.

In addition, when the heater 47 is driven, the purified water in the hot water tank 9 is heated by the heat of the heater 47 to be changed to hot water.

Even in the cooling and heating of the purified water in the cold water tank 7 and the hot water tank 9, the purified water operation is continuously performed until the water level in the purified water tank 3 reaches the full water level.

At this time, in step S9 the cold water temperature (Tc) in the cold water tank (7) lowered by the repetitive circulation operation of the refrigeration cycle is detected by the cold water temperature detection means 112 and output to the control means 110, and in step S10 The control means 110 determines whether the cold water temperature Tc detected by the cold water temperature detecting means 112 is equal to or lower than the cold water setting temperature Tcs set by the temperature setting switch 105, and thus the cold water temperature Tc. Is not lower than or equal to the cold water set temperature Tcs (NO), the cold water in the cold water tank 7 must be cooled continuously, and the process returns to the step S8 while driving the compressor 35 and the fan motor 39. The operation of step S8 or less is repeated.

As a result of the determination in step S10, when the cold water temperature Tc is equal to or lower than the cold water set temperature Tcs (YES), the cold water in the cold water tank 7 does not need to be cooled. The motor driving means 122 stops driving the compressor 35 and the fan motor 39 under the control of the control means 110.

Subsequently, in step S12, the hot water temperature Th in the hot water tank 9 rising by the heat of the heater 47 is detected by the hot water temperature detecting means 114 and output to the control means 110, step S13. The control means 110 determines whether the hot water temperature Th detected by the hot water temperature detecting means 114 is equal to or higher than the hot water setting temperature Ths set by the temperature setting switch 105, and thus the hot water temperature Th. Is not higher than the set hot water temperature (Ths) (NO), the hot water in the hot water tank 9 must be continuously heated, and returns to the step S8 to operate the heater 47 and the operation under the stem S8. Repeat

As a result of the discrimination in the stem S13, when the hot water temperature Th is equal to or higher than the hot water set temperature Ths (YES), the hot water tank 9 does not need to be heated. The driving of the heater 47 is stopped under the control of the control means 110.

Subsequently, in step S15, the water level detecting unit 102 detects the water level of the purified water tank 3, which changes during cold / hot water generation according to the water purification operation in step S6, and outputs the detected water level to the control unit 110. ), It is determined whether the water level of the purified water tank 3 detected by the water level detecting unit 102 is more than full water level.

As a result of the discrimination in step S15, when the water level of the purified water tank 3 is not higher than the full water level (NO), the purified water must be continuously supplied to the purified water tank 3, and the flow returns to the step S6 to perform the water purification operation. While performing, the operation below Step S6 is repeatedly performed.

On the other hand, when it is determined in step S15 that the water level of the purified water tank 3 is equal to or more than the full water level (YES), the supply of purified water in the purified water tank 3 should be stopped, and the control means 110 proceeds to step S16. Outputs a control signal for closing the water supply valve 81 to the water supply valve driving means 118.

Therefore, the water supply valve driving means 118 shuts off the power supply voltage applied to the water supply valve 81 under the control of the control means 110 to close the water supply valve 81.

At this time, in step S17, the pump driving means 116 cuts the power supply voltage applied to the pressure pump 33 under the control of the control means 110 to stop the pressure pump 33.

When the water supply valve 81 is closed and the pressure pump 33 is stopped, the supply of raw water supplied from the tap water is cut off so that the purified water is no longer supplied into the purified water tank 3 and stops the water purification operation.

Subsequently, in step S18, it is determined whether a predetermined time (about 2 to 3 days) has elapsed by the built-in timer of the control means 110, and when the predetermined time has not elapsed (NO) The operation of step S18 or below is repeated until a predetermined time elapses.

As a result of the discrimination in step S18, when a predetermined time has elapsed (YES), it is determined that the microorganisms can breed because the purified water in the tanks 3, 7, 9 is not taken for a long time. The control means 110 outputs a control signal for draining the purified water in the tanks 3, 7 and 9 to the drain valve driving means 126.

Therefore, the drain valve driving means 126 supplies the power voltage applied to the drain valve 127 under the control of the control means 110 to open the drain valve 127.

When the drain valve 127 is opened, the purified water in the purified water tank 3, the hot water in the hot water tank 9 and the cold water in the cold water tank 7 are drained to the outside through a drain pipe not shown, and in step S20 It is determined whether the drainage operation according to the opening of the valve 127 has elapsed for a predetermined time (time required for the water in the tank to be completely drained, about 15 minutes).

As a result of the discrimination in step S20, when the predetermined time has not elapsed (NO), the water in the tanks 3, 7, 9 is not completely drained, and the flow returns to the step S19 to perform the operation of step S19 or less. When the predetermined time has elapsed (YES), it is determined that the water in the tanks 3, 7, 9 is completely drained, and the flow proceeds to step S21, where the drain valve driving means (one) is controlled. Under the control of 110, the power supply voltage applied to the drain valve 127 is cut off to close the drain valve 127.

When the drain valve 127 is closed, since the drain operation is completed, the flow proceeds to step S22 to detect the level of the purified water tank 3 in the water level detecting unit 102 and outputs it to the control unit 110.

Accordingly, the control means 110 determines whether the water level of the purified water tank 3 detected by the water level detecting unit 102 is greater than or equal to the medium level, and the water level of the purified water tank 3 is not greater than the medium level. (NO), the flow returns to step S4 to perform the water purifying operation for supplying the purified water to the purified water tank 3, and the operations below Step S4 are repeatedly performed.

As a result of the determination in step S22, when the water level of the purified water tank 3 is higher than the medium water level (YES), it is not necessary to supply the purified water to the purified water tank 3, and the control means 110 proceeds to the purified water. End the operation while stopping the operation.

If the water level of the purified water tank 3 is higher than or equal to the low water level (YES), the step S8 cools and heats the purified water stored in the cold water tank 7 and the hot water tank 9 in the result of the discrimination in step S3. Subsequently, the operation of step S8 or less is repeated.

As described above, according to the drainage control device of the water purifier according to the present invention, when a predetermined time (about 2 to 3 days) elapses, water in the tanks 3, 7, 9 is automatically drained to prevent microbial propagation. Therefore, the intake of contaminated water can be prevented, and improved clean water can be taken even during long-term storage of purified water.

Claims (4)

In a water purifier having a purified water tank (3), a cold water tank (7), and a hot water tank (9) for supplying hot water and cold water by heating and cooling the raw water supplied through a plurality of filters, and then heating and cooling the raw water. Control means 110 for controlling the drainage operation of the purified water in the tank (3, 7, 9) by counting the power-on time, and in the tank (3, 7, 9) under the control of the control means 110 Drainage control device for a water purifier, characterized in that consisting of a drain valve driving means (126) for driving the drain valve 127 to drain the purified water. The method of claim 1, wherein the drain valve driving means 126 opens the drain valve 127 when the time counted by the control means 110 passes a predetermined time to purify the water in the tank (3, 7, 9) Drainage control device for water purifier, characterized in that for draining. The drain control apparatus according to claim 1, wherein the drain valve (127) is a solenoid valve which is opened and closed under the control of the control means (110). The water drainage control device according to claim 2, wherein the predetermined time is about 2 to 3 days.