KR20230040810A - Water purifier - Google Patents

Abstract

The present invention relates to a water purifier. The water purifier according to the present invention comprises: a tank extending in the vertical direction to receive purified water, providing a receiving space whose maximum length in the height direction is at least three times the maximum length in the width direction, and provided to allow the purified water to flow into the upper side of the receiving space; a refrigerant flow path provided so that a refrigerant that cools the purified water stored inside the receiving space to generate cold water flows into the upper side of the receiving space and flows through the lower part of the receiving space to the upper side of the receiving space; a compressor providing flow force to the refrigerant disposed inside the refrigerant flow path; a first temperature sensor disposed on the lower part of the receiving space to measure the temperature of the cold water; a second temperature sensor disposed on the upper part of the receiving space to measure the temperature of cold water; and a controller controlling the operation of the compressor based on the first temperature measured by the first temperature sensor and the second temperature measured by the second temperature sensor. Accordingly, the present invention effectively prevents supercooling.

Description

Water purifier {WATER PURIFIER}

The present invention relates to a water purifier, and more particularly, to a water purifier capable of generating and providing cold water by cooling purified water.

A water purifier is a device for providing purified water by filtering raw water supplied from the outside. In addition to supplying purified water, the water purifier cools the purified water to generate and supply cold water. Conventional water purifiers capable of supplying cold water include a cold water storage tank in which a significant amount of cold water is stored, and a temperature sensor for measuring the temperature of the cold water may be disposed in the cold water storage tank. In general, one temperature sensor is disposed. Therefore, when the temperature sensor is out of order, there is a problem that supercooling or cold water is not generated.

Korean Patent Publication No. 10-2019-0115270 of Coway Co., Ltd. discloses a water purifier having a cold water tank. One temperature sensor for detecting the temperature of the stored cold water is installed in the cold water tank, but such a configuration does not provide redundancy in temperature measurement and acts as a factor that lowers the reliability of the product.

On the other hand, in recent years, direct water purifiers without a storage tank having a large storage capacity have been popularized according to an increase in user demand for freshness and sanitation of purified water and a trend toward miniaturization of products.

In general, a direct water purifier has a cold water tank having a smaller capacity than an existing storage tank, and purified water may temporarily stay in the cold water tank or be cooled while flowing in the cold water tank to be generated as cold water. In order to prevent overcooling or insufficient cooling in such a direct water purifier, precise temperature measurement is required considering a refrigerant passage for cooling and a space inside a cold water tank. In addition, it is also required to improve product reliability through securing redundancy related to temperature measurement of direct water purifiers.

Korean Patent Registration No. 2247220 of Coway Co., Ltd. discloses a direct water purifier capable of generating cold water. The disclosed water purifier includes a cooling unit that generates cold water, but a specific configuration related to temperature measurement inside the cooling unit is not disclosed.

Korean Patent Publication No. 10-2019-0115270 Korean Registered Patent Publication No. 10-2247220

In order to solve the above problem, the water purifier according to the present invention considers both the temperature of the lower part and the upper part in the cold water tank having a long length in the vertical direction to stop cooling or reduce the cooling rate, thereby effectively preventing supercooling aims to do

The purpose of the water purifier according to an embodiment of the present invention is to effectively prevent supercooling through cooling control taking into account the difference between the temperature of the bottom and the temperature of the top, which is generated due to structural factors in a cold water tank having a long length in the vertical direction. do.

An object of the water purifier according to an embodiment of the present invention is to increase cold water generation efficiency by starting cooling or increasing the cooling rate according to a predetermined standard after stopping cooling or reducing the cooling rate.

An object of the water purifier according to an embodiment of the present invention is to prevent overcooling or overheating of the compressor by stopping the compressor when it is continuously operated for a reference time or longer.

An object of the water purifier according to an embodiment of the present invention is to improve system reliability by being configured to enable control through the other temperature sensor even when one of the two temperature sensors is out of order.

In order to achieve the above object, the water purifier according to the present invention provides an accommodation space extending in the vertical direction to accommodate purified water and having a maximum length in the height direction at least three times greater than the maximum length in the width direction. A tank provided to be introduced; a refrigerant flow path provided so that a refrigerant that cools the purified water stored in the accommodation space to generate cold water flows into the upper part of the accommodation space and passes through the lower part of the accommodation space to the upper part of the accommodation space; a compressor providing flow force to the refrigerant disposed inside the refrigerant flow passage; a first temperature sensor disposed below the accommodation space to measure the temperature of the cold water; a second temperature sensor disposed above the accommodation space to measure the temperature of the cold water; and a controller controlling the operation of the compressor based on the first temperature measured by the first temperature sensor and the second temperature measured by the second temperature sensor.

In the water purifier according to an embodiment of the present invention, the controller operates the compressor to stop or slow down the flow of the refrigerant when the first temperature is less than or equal to the first target temperature and the second temperature is less than or equal to the second target temperature. It is characterized in that the operation is stopped or deceleration is controlled.

In the water purifier according to an embodiment of the present invention, the first target temperature is greater than or equal to the second target temperature.

In the water purifier according to an embodiment of the present invention, the controller may start the operation of the compressor or increase the speed of the compressor when a predetermined time has elapsed after stopping or controlling the deceleration of the compressor.

In the water purifier according to an embodiment of the present invention, the controller stops the operation of the compressor or controls the deceleration, and then the first temperature reaches a first recooling start temperature set higher than the first target temperature, When the second temperature reaches a second re-cooling start temperature set higher than the second target temperature, the operation of the compressor is started or the speed increase is controlled.

In the water purifier according to an embodiment of the present invention, the controller stops the operation of the compressor when the continuous operation time of the compressor is equal to or longer than the reference continuous operation time regardless of the first temperature and the second temperature. do.

In the water purifier according to an embodiment of the present invention, the controller stops the operation of the compressor when any one of the first temperature and the second temperature is equal to or less than a set subcooling reference temperature.

In the water purifier according to an embodiment of the present invention, when the second temperature cannot be measured due to a failure of the second temperature sensor, the controller determines that the first temperature is equal to or less than the first target temperature and the continuous operating time of the compressor. The operation of the compressor is stopped or decelerated so that the flow of the refrigerant is stopped or slowed down when the reference continuous operating time is longer than the reference continuous operating time.

In the water purifier according to an embodiment of the present invention, when the first temperature cannot be measured due to a failure of the first temperature sensor, the controller stops the flow of the refrigerant when the second temperature becomes equal to or less than the second target temperature. It is characterized in that the operation of the compressor is stopped or decelerated so as to be stopped or slowed down.

According to the above configuration, the water purifier according to the present invention considers both the lower temperature and the upper temperature in the cold water tank having a long length in the vertical direction to stop cooling or reduce the cooling rate, thereby effectively preventing supercooling. provides

The water purifier according to an embodiment of the present invention provides an effect of effectively preventing supercooling through cooling control taking into account the temperature difference between the temperature of the lower part and the upper part generated due to structural factors in a cold water tank having a long length in the vertical direction. do.

The water purifier according to an embodiment of the present invention provides an effect of increasing cold water generation efficiency by starting cooling or increasing the cooling rate according to a predetermined criterion after stopping cooling or reducing the cooling rate.

The water purifier according to an embodiment of the present invention provides an effect of preventing overcooling or overheating of the compressor by stopping the compressor when it is continuously operated for a reference time or longer.

The water purifier according to an embodiment of the present invention is configured to be controlled through the other temperature sensor even when one of the two temperature sensors is out of order, thereby providing an effect of improving system reliability.

1 is a block diagram of a water purifier according to an embodiment of the present invention;
2 is a view showing the width and length of an accommodation space of a tank of a water purifier according to an embodiment of the present invention;
3 is a flowchart illustrating a process of performing cooling and stopping cooling of a water purifier according to an embodiment of the present invention;
4 is a flowchart illustrating a process of performing cooling, stopping cooling, and resuming cooling of a water purifier according to an embodiment of the present invention;

Words and terms used in this specification and claims are not construed as limited in their ordinary or dictionary meanings, but in accordance with the principle that the inventors can define terms and concepts in order to best describe their inventions. It should be interpreted as a meaning and concept that corresponds to the technical idea.

Since the embodiments described in this specification and the configurations shown in the drawings correspond to a preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention, the corresponding configurations are various equivalents to replace them at the time of filing of the present invention. There may be water and variations.

In this specification, terms such as "include" or "have" are intended to describe the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

A component being in the "front", "rear", "above" or "below" of another component means that it is in direct contact with another component, unless there are special circumstances, and is "in front", "rear", "above" or "below". It includes not only those disposed at the lower part, but also cases in which another component is disposed in the middle. In addition, the fact that certain components are “connected” to other components includes cases where they are not only directly connected to each other but also indirectly connected to each other unless there are special circumstances.

Hereinafter, a water purifier according to an embodiment of the present invention will be described with reference to the drawings.

1 is a configuration diagram of a water purifier according to an embodiment of the present invention.

The water purifier 100 according to an embodiment of the present invention provides purified water by filtering raw water supplied from the outside. The water purifier 100 according to an embodiment of the present invention may be a direct water purifier without a storage tank. In addition, the water purifier 100 according to an embodiment of the present invention may generate and supply cold water by cooling purified water.

Referring to FIG. 1 , a water purifier 100 according to an embodiment of the present invention includes a purified water generator 110, a purified water supply passage 120, a tank 130, a refrigerant flow passage 140, a compressor 150, It may include a first temperature sensor 160 , a second temperature sensor 170 , a controller 180 and a cold water outlet passage 190 .

The purified water generation unit 110 generates purified water by filtering raw water supplied from the outside. The purified water generating unit 110 may include a raw water inflow passage into which raw water flows, one or more filters filtering raw water, and the like.

The purified water supply passage 120 supplies purified water generated by the purified water generator 110 . In one embodiment of the present invention, the purified water supply passage 120 supplies purified water generated by the purified water generator 110 to the tank 130 . More specifically, one end of the purified water supply passage 120 may be connected to the purified water generator 110, and the other end may be disposed to be exposed above the receiving space S formed inside the tank 130.

The tank 130 accommodates purified water and provides an accommodation space S in which the received purified water is cooled and generated as cold water. In the receiving space S provided by the tank 130, purified water temporarily stays or cools while flowing, and through this, cold water is generated.

The tank 130 provides an accommodation space S that extends vertically to accommodate purified water and has a maximum length in the height direction that is at least three times greater than the maximum length in the width direction. The tank 130 may be provided so that purified water flows into the upper side of the accommodation space (S). As described above, the purified water supply passage 120 enters into the accommodation space S of the tank 130 and is disposed, and the purified water supply passage 120 discharges purified water to the upper portion of the accommodation space S. can be placed.

2 is a view showing the width and length of an accommodation space of a tank of a water purifier according to an embodiment of the present invention. Referring to FIG. 2 , the tank 130 may be placed in a form sealed against the outside air and erected on the ground. In addition, an accommodation space S for receiving purified water is formed inside the tank 130. The accommodation space S extends in the vertical direction and has a maximum length h in the height direction of at least the maximum length w in the width direction. It can be formed to be three times or more.

For example, the tank 130 may have a cylindrical shape. Of course, the shape of the tank 130 is not limited to a cylindrical shape, and may have various shapes on the premise that the maximum length h in the height direction is at least three times greater than the maximum length w in the lateral direction.

The purified water discharged from the end of the purified water supply passage 120 disposed above the accommodating space S of the tank 130 flows to the lower side of the accommodating space S. The purified water is cooled by exchanging heat with the refrigerant flowing through the refrigerant flow passage 140 while moving to the lower side of the accommodating space S, and through this, cold water is generated. At this time, since the tank 130 is placed upright on the ground, purified water flowing into the upper side of the accommodation space S smoothly moves downward. In addition, since the tank 130 has a long shape in the vertical direction, when the refrigerant flow passage 140 is arranged in the vertical direction in the accommodation space S, heat exchange between purified water and the refrigerant can sufficiently occur, thereby increasing the efficiency of generating cold water. .

On the other hand, the tank 130 may have a sealed structure with respect to the outside air. That is, the tank 130 may have a structure blocked from the outside by a side wall, a bottom, a cover, and the like, and may provide an accommodation space S therein.

The refrigerant flow passage 140 cools the purified water accommodated in the accommodation space (S) to generate cold water, and the refrigerant flows into the upper side of the accommodation space (S) and passes through the lower part of the accommodation space (S) to the accommodation space (S). It is provided so as to flow upward. The refrigerant flowing through the refrigerant flow passage 140 in the receiving space S exchanges heat with purified water to cool the purified water to generate cold water.

The refrigerant flow passage 140 penetrates the upper part of the tank 130 and extends to the lower part of the accommodating space S to allow the refrigerant to flow from the upper part to the lower part of the accommodating space S. A first flow passage 141; The second flow passage 142 connected to the first flow passage 141 at the lower part of the accommodation space S and converting the flow direction of the refrigerant to the upper side of the accommodation space S, and the lower part of the accommodation space S A third flow passage 143 connected to the second flow passage 142 and extending upward from the lower portion of the accommodating space S to allow the refrigerant to flow from the lower portion of the accommodating space S to the upper portion may be provided. The third flow passage 143 may pass through an upper portion of the tank 130 and extend to the outside of the tank 130 .

In the state where the refrigerant flow passage 140 is arranged as described above, the purified water introduced into the accommodation space S through the purified water supply passage 120 flows to the lower part of the accommodation space S, and as it is cooled, the density increases and turns into cold water. The converted, relatively cooled cold water moves downward by convection. In addition, the relatively less cooled cold water may contact the refrigerant flow passage 140 and be repeatedly cooled while flowing upward in the accommodation space S.

In the case of the water purifier 100 of the present invention, cooling efficiency can be maximized through the structure and arrangement of the purified water supply passage 120, the tank 130, and the refrigerant flow passage 140 as described above. Accordingly, it is possible to efficiently cool and supply purified water supplied by direct watering.

The compressor 150 provides flow force to the refrigerant disposed inside the refrigerant flow passage 140 . The compressor 150 is disposed outside the tank 130 and is connected to the end of the refrigerant inlet passage 141 and the end of the refrigerant outlet passage 143, respectively, to form a refrigerant circulation passage. In one embodiment of the present invention, the compressor 150 may be configured to enable control of the flow rate of the refrigerant. For example, the compressor 150 may be configured as an inverter compressor.

The first temperature sensor 160 is disposed below the accommodation space S to measure the temperature of the cold water. For example, the first temperature sensor 160 may be installed on the floor of the accommodation space (S). The first temperature sensor 160 measures the temperature of cold water located in the lower portion of the accommodation space S, and the first temperature measured by the first temperature sensor 160 determines whether cooling is stopped or the cooling rate is reduced. used as a basis for

The second temperature sensor 170 is disposed above the accommodation space (S) to measure the temperature of the cold water. For example, the second temperature sensor 170 may be installed on the upper side of the accommodation space (S). The second temperature sensor 170 measures the temperature of the cold water positioned above the accommodation space S, and the second temperature measured by the second temperature sensor 170 is the first temperature measured by the first temperature sensor 160. 1 Together with the temperature, it is used as a basis for determining whether to stop cooling or reduce the cooling rate.

The controller 180 controls the operation of the compressor 150 based on the first temperature measured by the first temperature sensor 160 and the second temperature measured by the second temperature sensor 170 . The controller 180 may stop cooling or slow down the cooling rate when the first temperature is equal to or less than the first target temperature and the second temperature is equal to or less than the second target temperature. More specifically, the controller 180 stops or slows down the operation of the compressor 150 so that the flow of the refrigerant is stopped or slowed down when the first temperature is less than or equal to the first target temperature and the second temperature is less than or equal to the second target temperature. You can control it.

In this case, the first target temperature may be set equal to or greater than the second target temperature. In one embodiment of the present invention, the temperature of the lower end of the accommodation space (S) drops more rapidly than the upper end in the initial stage of cooling, but when the saturation state is reached after the cooling progresses to a certain extent, the accommodation space, which is the part into which the refrigerant is introduced The temperature of the upper part of (S) tends to be lower. For example, in a state in which cooling is completed and purified water is completely converted into cold water, the temperature of the upper part of the accommodation space S is about 4 to 5 ° C, and the temperature of the lower part of the accommodation space S is about 5 to 5 ° C. It can be 6°C. Considering this point, the first target temperature may be set to 5 to 6°C, and the second target temperature may be set to 4 to 5°C.

Meanwhile, the controller 180 may stop the operation of the compressor 150 when the continuous operating time of the compressor 150 is equal to or longer than the reference continuous operating time regardless of the first temperature and the second temperature. In other words, the controller 180 may stop cooling when cooling continuously proceeds for a predetermined reference time or longer. Through this, overcooling, overheating of the compressor 150, and the like can be prevented. In this case, the reference continuous operating time may be set differently according to the installation environment of the water purifier 100, the performance of the compressor 150, and the like. For example, the reference continuous operation time may be set between 1 hour and 2 hours.

In addition, the controller 180 may stop the operation of the compressor 150 when any one of the first temperature and the second temperature is equal to or less than a set subcooling reference temperature. That is, the controller 180 may stop cooling when it is determined that supercooling has progressed because any one of the first temperature and the second temperature is below the supercooling reference temperature. Through this, overcooling, overheating of the compressor 150, and the like can be prevented. In this case, the subcooling reference temperature may be set differently according to the installation environment of the water purifier 100, the performance of the tank 130, and the like. For example, the subcooling reference temperature may be set to 2 to 3°C.

In addition, the controller 180 may start the operation of the compressor 150 or control the speed increase after a predetermined time has elapsed after stopping the cooling or reducing the cooling rate, that is, after stopping the operation of the compressor 150 or controlling the deceleration. can Meanwhile, after the controller 180 stops the operation of the compressor 150 or controls the deceleration, the first temperature reaches the first re-cooling start temperature set higher than the first target temperature, and the second temperature reaches the first temperature. When the second re-cooling start temperature set higher than the target temperature of 2 is reached, the operation of the compressor 150 may be started or speed-up control may be performed. Through this control, a decrease in cooling efficiency can be prevented.

The first re-cooling start temperature and the second re-cooling start temperature may be set differently depending on the installation environment of the water purifier 100 and the performance of the compressor 150 . For example, the first re-cooling start temperature may be set to 7-8 °C, and the second re-cooling start temperature may be set to 6-7 °C.

The cold water outlet passage 190 is provided to discharge the cold water generated in the receiving space S of the tank 130 to the outside. The cold water outlet passage 190 may be provided so that cold water is discharged from the top of the receiving space S through the side of the tank 130 to the outside.

In one embodiment of the present invention, the cold water outlet flow path 190 communicates with the bottom of the receiving space (S) to discharge cold water to the lower part of the tank 130 and then converts the flow direction of the cold water to the upper side to accommodate the cold water. A first water outlet flow path 191 flowing toward the bottom of the space S, connected to the first water outlet flow path 151 and extending upward of the accommodation space S, through the first water outlet flow path 191 to the accommodation space ( The second water outlet 192 flows the cold water entering the side S) to the upper portion of the accommodation space S, and is connected to the second water outlet 192 at the top of the accommodation space S and is connected to the side of the tank 130 A third water outlet passage 193 extending in the lateral direction of the accommodation space S to pass through and discharging cold water to the outside through the side surface of the tank 130 may be provided.

3 is a flowchart illustrating a process of performing cooling and stopping cooling of a water purifier according to an embodiment of the present invention. A process of cooling control by the controller 180 is described below with reference to FIG. 3 .

First, cooling is performed when cold water generation request information is input to the controller 180 (S10). Specifically, the controller 180 may operate the compressor 150 to circulate the refrigerant through the refrigerant flow passage 140, and the receiving space (S) of the tank 130 by the refrigerant flowing through the refrigerant flow passage 140. ), purified water can be cooled inside to produce cold water.

Next, the controller 180 determines whether the first temperature measured by the first temperature sensor 160 is equal to or less than the first target temperature (S20). As described above, the first temperature may be the temperature of the cold water located at the bottom of the accommodating space S, and the first target temperature may be set equal to or greater than the second target temperature.

Meanwhile, when the first temperature is equal to or less than the first target temperature, the controller 180 determines whether the second temperature measured by the second temperature sensor 170 is equal to or less than the second target temperature (S30). As described above, the second temperature may be the temperature of the cold water located at the upper end of the accommodating space S, and the second target temperature may be set equal to or smaller than the first target temperature.

In addition, when the first temperature is not equal to or less than the first target temperature or when the first temperature is equal to or less than the first target temperature but the second temperature is not equal to or less than the second target temperature, the controller 180 determines whether the cooling time is greater than or equal to the reference time. It is judged (S40). For example, the controller 180 may determine whether the continuous operation time of the compressor 150 is greater than or equal to a reference continuous operation time.

Finally, when the first temperature is equal to or less than the first target temperature, the second temperature is equal to or less than the second target temperature, or the cooling time is greater than or equal to the reference time, the controller 180 stops cooling or decelerates the cooling rate (S50). ). In more detail, the controller 180 may stop the operation of the compressor 150 or decelerate the compressor 150 to reduce the flow speed of the refrigerant.

4 is a flowchart illustrating processes of performing cooling, stopping cooling, and resuming cooling of a water purifier according to an embodiment of the present invention.

Referring to FIG. 4 , the process until cooling is stopped or decelerated has been described with reference to FIG. 3 . However, after cooling is stopped or decelerated, the controller 180 additionally determines whether the cooling resume condition is satisfied (S60). For example, the individual cooling condition may be a case where a predetermined time has elapsed after stopping the operation of the compressor 150 or controlling the deceleration. In addition, the cooling resume condition is that the first temperature reaches a first re-cooling start temperature set higher than the first target temperature after the operation of the compressor 150 is stopped or deceleration is controlled, and the second temperature is the second temperature. 2 It may be the case that the second re-cooling start temperature set higher than the target temperature is reached.

In the above, cooling control is performed using both the first temperature measured by the first temperature sensor 160 and the second temperature measured by the second temperature sensor 170 in the water purifier 100 according to an embodiment of the present invention. looked into what to do. However, according to an embodiment of the present invention, cooling control can be continuously performed even when one of the first temperature sensor 160 and the second temperature sensor 170 is out of order, thereby improving reliability of the system.

More specifically, when the second temperature cannot be measured due to a failure of the second temperature sensor 170, the controller 180 determines that the first temperature is equal to or less than the first target temperature and the continuous operation time of the compressor 150 is the reference. When the continuous operation time exceeds, the operation of the compressor may be stopped or decelerated so that the flow of the refrigerant is stopped or slowed down. In addition, when the first temperature cannot be measured due to a failure of the first temperature sensor, the controller 180 operates the compressor to stop or slow down the flow of the refrigerant when the second temperature becomes equal to or less than the second target temperature. can be stopped or decelerated.

In this way, the controller 180 may continuously perform cooling control based on the measured temperature of the other one even when one of the first temperature sensor 160 and the second temperature sensor 170 is out of order. In this regard, the controller 180 may perform a process of checking whether each sensor is out of order before measuring temperatures by the first temperature sensor 160 and the second temperature sensor 170 .

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention may add elements within the scope of the same spirit. However, other embodiments can be easily proposed by means of changes, deletions, additions, etc., but these will also fall within the scope of the present invention.

100: water purifier
110: purified water generator 120: purified water supply flow path
130: tank 140: refrigerant flow path
150: compressor 160: first temperature sensor
170: second temperature sensor 180: controller
190: cold water outlet flow path

Claims (9)

a tank extending vertically to accommodate purified water, providing an accommodation space having a maximum length in a height direction at least three times greater than a maximum length in a width direction, and configured to allow purified water to flow into the upper side of the accommodation space;
a refrigerant flow path provided so that a refrigerant that cools the purified water stored in the accommodation space to generate cold water flows into the upper part of the accommodation space and passes through the lower part of the accommodation space to the upper part of the accommodation space;
a compressor providing flow force to the refrigerant disposed inside the refrigerant flow passage;
a first temperature sensor disposed below the accommodation space to measure the temperature of the cold water;
a second temperature sensor disposed above the accommodation space to measure the temperature of the cold water; and
and a controller controlling the operation of the compressor based on the first temperature measured by the first temperature sensor and the second temperature measured by the second temperature sensor. According to claim 1,
The controller stops or decelerates the compressor so that the flow of the refrigerant stops or slows down when the first temperature is equal to or less than the first target temperature and the second temperature is equal to or less than the second target temperature. . According to claim 2,
The first target temperature is greater than or equal to the second target temperature. According to claim 2,
The water purifier, characterized in that the controller starts the operation of the compressor or controls the speed increase when a predetermined time has elapsed after stopping or controlling the deceleration of the compressor. According to claim 2,
After the controller stops the operation of the compressor or controls the deceleration, the first temperature reaches a first re-cooling start temperature set to be higher than the first target temperature, and the second temperature is set to be higher than the second target temperature. The water purifier characterized in that when the second re-cooling start temperature is reached, the operation of the compressor is started or the speed increase is controlled. According to claim 1,
The water purifier, characterized in that the controller stops the operation of the compressor when the continuous operation time of the compressor is equal to or longer than the reference continuous operation time regardless of the first temperature and the second temperature. According to claim 1,
The water purifier, characterized in that the controller stops the operation of the compressor when any one of the first temperature and the second temperature is equal to or less than a set supercooling reference temperature. According to claim 1,
When the second temperature cannot be measured due to a failure of the second temperature sensor, the controller controls the flow of the refrigerant when the first temperature is equal to or less than the first target temperature and the continuous operating time of the compressor is greater than or equal to the reference continuous operating time. The water purifier, characterized in that for stopping or decelerating the operation of the compressor to stop or slow down. According to claim 1,
When the first temperature cannot be measured due to a failure of the first temperature sensor, the controller stops or slows down the operation of the compressor so that the flow of the refrigerant stops or slows down when the second temperature becomes less than or equal to a second target temperature. A water purifier characterized in that for controlling.

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