CN106477666B - Water purification system and sterilization method - Google Patents

Abstract

The invention relates to a water purification system and a sterilization method, wherein the water purification system comprises: a filter unit including one or more filters for filtering raw water supplied from the outside; a water storage tank including an inlet through which purified water filtered by the filter unit flows in and an outlet through which the purified water flows out, the water storage tank storing the purified water; and a sterilization device connected to the filter unit, for circulating and sterilizing a part of the purified water passing through the filter unit, the sterilization device including: an ultraviolet light emitting diode disposed at an upper side of an inside of the water storage tank to sterilize the stored raw water, a circulation pipe disposed at an outside of the water storage tank, the circulation pipe being communicated with the inlet and the outlet to form a circulation flow path of the purified water stored in the water storage tank, a circulation pump disposed at a lower end of the water storage tank so as to be connected to the circulation pipe, the circulation pump circulating a part of the stored purified water by supplying power to the circulation flow path.

Description

Water purification system and sterilization method

This application claims priority from korean patent application No. KR10-2015 0120367, filed on 26/8/2015, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to a water purification system provided with a sterilization device for sterilizing purified water circulating in a water storage tank, and a purified water supply device provided with the same.

Background

A water storage tank is provided in a dispenser of a water purifier or a refrigerator. Since the water storage tank is supplied after storing the water for a predetermined time, bacteria such as microorganisms, germs, or viruses can be propagated in the water stored in the water storage tank. Therefore, the water stored inside the water storage tank is sterilized in various ways using a mercury lamp, a halogen lamp, an ultraviolet light emitting diode (UV LED), or the like.

Generally, an Ultraviolet (UV) sterilizer uses a mercury lamp. However, the mercury lamp generally generates much heat, and since the mercury lamp contains mercury therein, there is a possibility of environmental pollution, and since the lamp has a short life, it is required to periodically replace the lamp, and it is also required to clean the quartz tube for the lamp at any time. Further, since the size of the ultraviolet lamp is relatively large, the space in the water storage tank is reduced.

Recently, with the development of ultraviolet light emitting diode technology, ultraviolet light emitting diodes are applied to various fields, which are more compact in size, highly efficient, non-toxic, and long-term usable due to their long life, compared to the above-mentioned mercury lamps. In addition, the ultraviolet light emitting diode does not contain mercury, and the ultraviolet light emitting diode has almost no preheating time unlike the ultraviolet lamp. Also, since the voltage and energy required for the ultraviolet light emitting diode are low and the life of the ultraviolet light emitting diode is extended, the replacement cycle can be extended.

However, when the ultraviolet light emitting diode is used to sterilize water in the water storage tank, the light performance is maintained only in a predetermined region of the surface of the water due to the range of the irradiation angle of the Light Emitting Diode (LED) and the refraction of light on the surface of the water, and the predetermined region of the surface of the water is sterilized. However, in a space other than the irradiation angle of the light emitting diode in the surface area of water or in the bottom area of water, a dead zone (deadzone)5 is formed, which light of the light emitting diode cannot reach, and there is a problem that the sterilization performance is deteriorated.

Fig. 1 is a schematic diagram showing a surface sterilization region of a conventional ultraviolet light emitting diode 3. Referring to fig. 1, purified water in a purified water tank 1 is sterilized by ultraviolet light emitting diodes 3, but is sterilized only in a sterilization zone 4 where light from the ultraviolet light emitting diodes in the purified water 2 can reach. Since the light of the ultraviolet light emitting diode 3 cannot reach the dead zone 5 due to the limitation of the refraction of the light on the surface of the water, the irradiation angle of the ultraviolet light emitting diode 3, and the like, there is a problem that the overall sterilization efficiency of the purified water 2 is low.

Further, in order to adjust the sterilization performance, it is necessary to irradiate the ultraviolet light emitting diode light with high intensity, and there is a problem that the life of the ultraviolet light emitting diode is shortened.

On the other hand, conventionally, there is an apparatus for performing sterilization by circulating water in a water storage tank in order to improve sterilization performance. Such a conventional circulation sterilization method performs sterilization by providing a halogen lamp or the like in a pipe for circulating water, directly sterilizing the water inside the pipe by light emitted from the halogen lamp, and newly supplying the sterilized water to the water storage tank.

Since the conventional circulation sterilization method using the halogen lamp performs sterilization only in the circulating pipe, there is a limitation in a space where sterilization can be performed at a time, and thus there is a problem in that water stored in the water storage tank cannot be efficiently sterilized.

Further, since the halogen lamp disposed in the pipe causes a resistance of the flow path to increase, clean water cannot be circulated well, and a circulation speed is reduced, thereby causing a problem of a decrease in sterilization efficiency. On the other hand, there is a sanitary problem that water is contaminated when the halogen lamp is broken in the pipe.

Disclosure of Invention

An object of the present invention is to provide a structure for circulating purified water in a water storage tank to sterilize the purified water in the water storage tank as a whole, thereby solving the problem of sterilizing only the surface area of the purified water stored in the water storage tank.

It is still another object of the present invention to provide a structure for shortening the time for light of the ultraviolet light emitting diode to reach the lower end of the water storage tank by water circulation, shortening the sterilization time, and increasing the service life of the ultraviolet light emitting diode.

Another object of the present invention is to provide a water purification system including a sterilization device having an ultraviolet light emitting diode for maximizing sterilization efficiency.

In order to solve the above problems, the water purification system provided with a sterilization device of the present invention includes: a filter unit including one or more filters for filtering raw water supplied from the outside; a water storage tank including an inlet through which the purified water filtered by the filter unit flows in and an outlet through which the purified water flows out, the water storage tank storing the purified water; and a sterilization device connected to the filter unit and configured to circulate a part of the purified water passing through the filter unit to perform sterilization, the sterilization device including: an Ultraviolet Light Emitting Diode (UVLED) disposed at an upper side of the inside of the water storage tank to sterilize the stored raw water; a circulation pipe provided outside the water storage tank, the circulation pipe communicating with the inlet and the outlet to form a circulation flow path of the purified water stored in the water storage tank; and a circulation pump connected to the circulation pipe at a lower end of the water storage tank, the circulation pump supplying power to a circulation flow path to circulate a part of the stored purified water.

According to an example of the present invention, the water storage tank is provided with a lid forming an upper surface of the water storage tank, the inflow port is disposed on one side of the lid, and the outflow port is disposed on the other side of a bottom surface of the water storage tank, so that the purified water can be convected in the water storage tank.

According to another aspect of the present invention, the water storage tank is provided with a cover for forming an upper surface of the water storage tank, the ultraviolet light emitting diode is provided in the cover and irradiates the stored purified water with light, and the ultraviolet light emitting diode is disposed adjacent to the inflow port.

The above-mentioned cover may include: a holder cover connected to an upper end of a side surface of the water storage tank to form a part of the cover; and a tank cover combined with the bracket cover to form the upper surface of the water storage tank, wherein the inflow port and the ultraviolet light emitting diode can be arranged on the bracket cover.

The ultraviolet light emitting diode may include: a light emitting unit which is provided in the holder cover inside the water storage tank and which can sterilize the stored purified water by irradiating the stored purified water with light; a Printed Circuit Board (PCB) substrate electrically connected to the light emitting part, the PCB substrate being coupled to the holder cover; and a wire section electrically connected to the printed circuit board substrate and capable of supplying power supplied from a power supply section to the ultraviolet light emitting diode to the light emitting section.

The ultraviolet light emitting diode may further include a printed circuit board housing combined with the printed circuit board substrate to connect the printed circuit board substrate and the wire part.

The holder cover may be provided with a water level detection sensor for detecting a water level of the purified water inside the water storage tank.

The ultraviolet light emitting diode may be disposed at a position higher than the water level detection sensor, and the ultraviolet light emitting diode may irradiate light onto a surface of the purified water stored in the water storage tank.

The water purification system with the sterilization device which runs at once can further comprise a control part, wherein the control part is electrically connected with the ultraviolet light emitting diode and the circulating pump, and the control part controls at least one of the working time of the ultraviolet light emitting diode, the intensity of the ultraviolet light emitting diode and the working time of the circulating pump according to the water level of the purified water.

In order to solve another problem described above, a sterilization method using a water purification system provided with a sterilization device according to the present invention includes: sterilizing the purified water stored in the water storage tank by operating the ultraviolet light emitting diode; circulating a part of the stored purified water through a circulation flow path by using a circulation pump; and controlling at least one of an operation time of the ultraviolet light emitting diode, an intensity of the ultraviolet light emitting diode, and an operation time of the circulation pump based on the water level of the water storage tank measured by the water level detection sensor.

Drawings

Fig. 1 is a schematic view showing a surface sterilization region of a conventional ultraviolet light emitting diode.

Fig. 2 is a water piping diagram showing a water purification system provided with a sterilization device according to the present invention.

Fig. 3 is a block diagram showing a water storage tank and a sterilizer of the present invention.

Fig. 4 is a perspective view showing the water storage tank and the sterilization apparatus in fig. 3.

Fig. 5 is a schematic diagram showing the structure and operation of the sterilization apparatus in fig. 4.

FIG. 6 is a perspective view showing the inside of the water storage tank cut away.

Fig. 7 is a perspective view showing an upper portion of the water storage tank.

Fig. 8A is a schematic view showing a first experimental example in which an ultraviolet light emitting diode is provided on the bottom surface of a water storage tank.

Fig. 8B is a schematic view showing a first experimental example in which an ultraviolet light emitting diode is provided in a lid of a water storage tank.

Fig. 9 is a graph showing the experimental results of the first experimental example in fig. 8A and the first experimental example in fig. 8B.

Fig. 10A shows simulation data indicating the sterilization range relating to the first experimental example in fig. 8A.

Fig. 10B shows simulation data indicating the sterilization range relating to the first experimental example in fig. 8B.

Fig. 11A is a schematic view showing a second experimental example in which an ultraviolet light emitting diode is provided at the center of the upper surface of a water storage tank.

Fig. 11B is a schematic diagram showing a second experimental example in which an ultraviolet light emitting diode is provided in the vicinity of an inlet on the upper surface of a water storage tank.

Fig. 11C is a schematic view showing a second experimental example in which an ultraviolet light emitting diode is provided on the upper surface of the water storage tank on the opposite side of the inflow port.

Fig. 12 is a flowchart of a method of ultraviolet light emitting diode sterilization using a water purification system provided with the sterilization device shown in fig. 3.

Detailed Description

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the drawings, and the same or similar components will be given the same or similar reference numerals, and the overlapping description thereof will be omitted. The suffix "part" of a structural element used in the following description is given or mixed for convenience of writing the description only and does not have a meaning or effect distinguished from each other by itself.

In the description of the embodiments disclosed in the present specification, when it is determined that the detailed description of the known art may obscure the gist of the embodiments disclosed in the specification, the detailed description thereof will be omitted. The drawings are only for the purpose of facilitating understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the drawings, and it is to be understood that the present invention includes all modifications, equivalent technical means, and alternatives within the spirit and technical scope of the present invention.

Terms including ordinal numbers such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are only used to distinguish one structural element from another.

When a component is referred to as being "connected" to another component, the component may be directly connected to or in contact with the other component, but it is understood that the other component may be present therebetween.

The singular expressions include the plural expressions as long as no other meanings are explicitly stated in the context.

In the present application, the terms "including" or "having" and the like should be understood to specify the presence of only the features, numerals, steps, actions, structural elements, components, or combinations thereof described in the specification, but not to preclude the presence or addition of one or more other features, numerals, steps, actions, structural elements, components, or combinations thereof.

Fig. 2 is a water piping diagram showing a water purification system 200 provided with a sterilization device according to the present invention.

Hereinafter, a water purification system 200 provided with a sterilization device will be described with reference to fig. 2.

The water purification system 200 provided with a sterilization device according to the present invention includes a filter unit 220, a water storage tank 10, and a sterilization device 100. The filter unit 220 includes one or more filters for filtering raw water supplied from the outside. The sterilization apparatus 100 is connected to the filter unit 220, and the sterilization apparatus 100 can circulate a part of the purified water passing through the filter unit 220 to perform sterilization. In the description following the description of fig. 3, the water storage tank 10 and the sterilization apparatus 100 will be described in more detail, and in the following description, the water purification system 200 including the filter unit 220 will be described.

The water purification system 200 provided with a sterilization device receives raw water, and causes the raw water to flow into the filter unit 220 through the pressure reducing valve 210. The filter part 220 may include a first filter 221, a second filter 222, a third filter 223, and a fourth filter 224. For example, the first filter 221 may be a Sediment pre-filter (segment pre-filter), the second filter 222 may be a pre-carbon filter, the third filter 223 may be a Reverse Osmosis (RO) filter, and the fourth filter 224 may be a post-carbon filter. The raw water passes through the filter to filter the foreign matter, thereby becoming purified water.

The purified water passing through the filter unit 220 flows through the purified water pipe. The purified water can flow into the water storage tank 10 of the water purification system 200 provided with a sterilizing device connected to a purified water pipe to store the purified water. Fig. 2 shows an example in which the purified water flowing into the water storage tank 10 is discharged directly through the intake valve 218. Although not shown in the drawings, the purified water may be discharged after flowing into the cold water tank and being cooled.

The filter portion 220 may be connected with a water inlet valve 213, a check valve 215, and a three-way valve 217.

The inlet valve 213 is connected to a water level detection sensor 50 of the reservoir tank 10, which will be described later, and blocks the supply of purified water when the water level detection sensor 50 detects that the reservoir tank is full of water.

The water storage tank 10 can be supplied with clean water by opening the check valve 215, and the reverse flow of the clean water can be prevented by closing the check valve 215 when the circulation module 40 performs the circulation sterilization.

On the other hand, the three-way valve 217 is connected to the filter unit 220 and the water storage tank 10, and by opening or closing a part of the three-way valve, purified water passing through the filter can be supplied and circulated and sterilized.

The purified water may be cooled by a cooling module, and the cooled purified water may be supplied to a cold water tank for storing cooled cold water.

The water purification system 200 of the present invention includes the water storage tank 10 and the sterilization device 100, and the details of the description of fig. 3 and 4 will be described in more detail.

The purified water inside the water storage tank 10 can be sterilized by the sterilizing device 100, and the purified water inside the water storage tank 10 can be discharged through the purified water valve 212. Alternatively, the purified water in the water storage tank 10 may be stored in the cold water tank 240 and the hot water tank 245, and then the flow of the purified water may be adjusted by the cold water valve 214 and the hot water valve 216, respectively, and then the flow rate may be adjusted by the water intake valve 218, and the purified water may be discharged through a water discharge pipe (not shown).

Fig. 3 is a block diagram showing the water storage tank 10 and the sterilization apparatus 100 according to the present invention, and fig. 4 is a perspective view showing the water storage tank 10 and the sterilization apparatus 100 in fig. 3. Fig. 5 is a schematic diagram showing the structure and operation of the water purification system 200 provided with the sterilization device 100 in fig. 4.

The sterilization apparatus 100 according to the present invention will be described below with reference to fig. 3 to 5.

The sterilization apparatus 100 of the present invention includes the ultraviolet light emitting diode 20, the power supply unit 30, the circulation pipe 42, and the circulation pump 48. Before describing the sterilization apparatus 100, the water storage tank 10 provided in the water purification system 200 will be described first, and then the structure of the sterilization apparatus 100 will be described.

The water storage tank 10 stores purified water filtered by the filter part 220. The "purified water" recited in the present invention may mean water filtered in a water purifier, but is not necessarily limited thereto, and is understood to mean water filtered to remove foreign substances.

The water storage tank 10 may have a hexagonal shape, a cylindrical shape, or the like, and fig. 4 shows an example of the water storage tank 10 in which a hexagonal shape is formed as a whole.

The water storage tank 10 is provided with an inflow port 13 through which purified water flows in and an outflow port 17 through which stored purified water flows out. The inlet 13 is an inlet through which purified water having passed through the filter unit 220 flows, and when purified water is circulated in the water storage tank 10 described later, the inlet 13 may be an inlet through which circulated purified water flows. An inflow valve 14 may be provided at the inflow port 13, and the inflow valve 14 may allow the purified water passing through the filter unit 220 to flow in. The outlet 17 is an outlet for discharging the purified water subjected to the circulation sterilization, and when the purified water in the water storage tank 10 is subjected to the circulation sterilization, the outlet 17 may serve as a passage through which the purified water flows out for the circulation of the purified water.

On the other hand, the water storage tank 10 may be formed of stainless steel in view of sanitation of purified water. The stainless steel water storage tank is less likely to generate scale than the plastic water storage tank, and is superior to the plastic water storage tank by 18 times in terms of bacteria inhibitory ability.

The inlet 13 and the outlet 17 communicate with a circulation pipe 42, and the circulation pipe 42 has a circulation passage 42a therein.

The water storage tank 10 may be provided with a cover 12 for forming an upper surface of the water storage tank 10. The cover 12 may be formed of a member different from the water storage tank 10, the inlet 13 may be formed in the cover 12, and the ultraviolet light emitting diode 20 may be provided in the cover 12.

The cover 12 includes a holder cover 12b and a slot cover 12 a.

The holder cover 12b is connected to an upper end of a side surface of the water storage tank 10, and the holder cover 12b forms a part of the cover 12. Referring to fig. 4 and 5, an example is shown in which a holder cover 12b is formed on the edge of the cover 12 to form a part of the upper surface of the water storage tank 10. The holder cover 12b may be formed of a plastic material, for example, acrylonitrile-butadiene-styrene (abs), polypropylene (pp), or the like.

The holder cover 12b may be provided with a plurality of structures of the inflow port 13 and the ultraviolet light emitting diode 20, and a water level detection sensor 50. By providing the Printed Circuit Board (PCB) substrate 25 having the ultraviolet light emitting diodes 20 on the holder cover 12b made of plastic, the possibility of short circuit (short) or open circuit (open) is reduced as compared with a configuration in which a plurality of electronic components of the ultraviolet light emitting diodes 20 are provided on the water storage tank 10 made of stainless steel or the tank cover 12a made of stainless steel.

The tank cover 12a is combined with the holder cover 12b to form an upper surface of the water storage tank 10. For example, the slot cover 12a may be formed of stainless steel. Referring to fig. 4 and 5, an opening may be formed in the holder cover 12b, and fig. 4 and 5 show an example of a structure in which the slot cover 12a is inserted into the opening so as to be openable and closable.

The holder cover 12b is coupled to the inflow port 13, the ultraviolet light emitting diode 20, and the water level detection sensor 50, and the tank cover 12a is configured to be openably and closably provided on the holder cover 12b in a state where the tank cover 12a is not coupled to another structure. Therefore, the structure in which the tank cover 12a is coupled to the holder cover 12b so as to be openable and closable is easy to attach and detach, or open and close, compared to the structure in which the tank cover 12a forms the entire upper surface of the water storage tank 10.

With the inlet 13, the ultraviolet light emitting diode 20, and the water level detection sensor 50 provided on the holder cover 12b, the inlet 13, the ultraviolet light emitting diode 20, and the water level detection sensor 50 are coupled to the water storage tank 10 regardless of the opening and closing of the tank cover 12a even when the tank cover 12a is opened and closed. In particular, when the wirings of the ultraviolet light emitting diode 20, the water level detection sensor 50, and the like are directly connected to the tank cover 12a, the wirings may be damaged when the tank cover 12a is opened or closed, and the wirings may be prevented from being damaged by the inflow port 13, the ultraviolet light emitting diode 20, and the water level detection sensor 50 being provided in the holder cover 12 b.

The inflow port 13 may be provided on one side of the cover 12 of the water storage tank 10, and the outflow port 17 may be provided on the other side of the bottom surface 16 of the water storage tank 10, and referring to fig. 4 and 5, an example in which the inflow port 13 and the outflow port 17 are arranged at positions diagonal to each other of the water storage tank 10 is shown, and as described later, this configuration is advantageous in that the inflow port 13 and the outflow port 17 are arranged at positions far from each other, thereby facilitating convection of purified water during circulation of purified water, and thus, a configuration advantageous in circulation sterilization is obtained.

As the inlet 13 and the outlet 17 are arranged at diagonal positions of the reservoir tank 10, when the circulation sterilization is performed, as shown in fig. 5, the purified water flowing in through the inlet 13 is stored in the upper left portion of the reservoir tank 10, and the purified water flows actively through the outlet 17, and the purified water flows out from the lower right portion of the reservoir tank 10, and the purified water flows actively through the lower right portion of the reservoir tank 10.

Therefore, as the inflow port 13 is disposed on one side of the lid of the water storage tank 10 and the outflow port 17 is disposed on the other side of the bottom of the water storage tank 10, that is, the inflow port 13 and the outflow port 17 are disposed at positions diagonal to each other of the water storage tank 10, the flow and circulation of the purified water can be made more active, and the efficiency of the circular sterilization can be further increased.

The inlet 13 and the outlet 17 are connected to each other by a circulation pipe 42 described later, and the circulation pipe 42 is provided outside the water storage tank 10. The purified water stored in the storage tank 10 circulates while passing through the outlet 17, the circulation passage 42a in the circulation pipe 42, and the inlet 13, thereby further improving the sterilization efficiency, which will be described in more detail.

A water level detection sensor 50 may be provided inside the water storage tank 10, and the water level detection sensor 50 may measure the level of purified water stored inside the water storage tank 10.

The water level detection sensor 50 is provided inside the water storage tank 10. For example, a plurality of water level detection sensors 50 may be provided inside the water storage tank 10 on one side of the lid 12. The ultraviolet light emitting diode 20 is disposed at a position higher than the water level detection sensor 50. For example, the ultraviolet light emitting diode 20 may be disposed at a position higher than the water level detection sensor 50 disposed at the highest position among the plurality of water level detection sensors 50. This will be described in more detail in the description of the ultraviolet light emitting diode 20.

The ultraviolet light emitting diode 20 is provided in the cover 12 inside the water storage tank 10 to sterilize the stored purified water. The ultraviolet light emitting diode 20 emits light having a wavelength within a predetermined range, and the wavelength may be 200 to 280nm, for example.

The ultraviolet light emitting diode 20 is disposed on the upper side of the inside of the water storage tank 10.

This configuration increases the irradiation and light emission area of the ultraviolet light emitting diode 20, and increases the sterilization efficiency, as compared with a configuration in which a halogen lamp or the ultraviolet light emitting diode 20 is provided inside a pipe through which purified water can be circulated. In addition, the present invention is configured to increase the efficiency of the circulation sterilization by preventing the flow path resistance from being reduced and increasing the circulation speed without additionally providing a light emitting section in the circulation pipe described later.

The ultraviolet light emitting diode 20 is disposed adjacent to the inlet 13 in the cover 12 of the water storage tank 10. As will be described later, the ultraviolet light emitting diode 20 may be disposed on the holder cover 12b so as to be adjacent to the inflow port 13. The above-described method of disposing the ultraviolet light emitting diodes 20 is to determine the installation positions of the ultraviolet light emitting diodes 20 in consideration of the sterilization efficiency of the water purification system 200 provided with the sterilization device, and various experiments are performed thereon, and the first experimental example and the second experimental example will be described later.

The water level detection sensor 50 is used to measure the water level of purified water, and a plurality of water level detection sensors 50 may be provided in the holder cover 12b inside the water storage tank 10. The water level detection sensor 50 may include: a sensor for detecting a water level of the purified water; and a sensor housing for coupling the sensor with the inside of the water storage tank 10.

Since the difference in permittivity between water and air is about 80 times, when the same space is filled with water and the same space is filled with air, the capacitance changes. The water level detection sensor 50 detects the change in electrostatic capacity by the sensor, and detects the water level in the clean water tank by measuring the change in electrostatic capacity when the sensor is in contact with water. The plurality of water level detection sensors 50 are disposed at the holder cover 12b in a spaced manner to measure the water level.

The water level detection sensor 50 is connected to the control unit 35, and the control unit 35 adjusts to reduce the intensity of the ultraviolet light emitting diode 20 or shorten the light emitting time when the water level of the purified water is low. On the other hand, when the water level of the purified water is high, the controller 35 adjusts the sterilizing performance according to the water level of the purified water by increasing the intensity of the ultraviolet light emitting diode 20 or by prolonging the light emitting time.

The ultraviolet light emitting diode 20 is disposed higher than the plurality of water level detection sensors 50. In this configuration, since the ultraviolet light emitting diode 20 is disposed so as to be spaced apart from the upper surface of the purified water, the ultraviolet light emitting diode is configured to emit light at a predetermined emission angle on the surface of the purified water. When the ultraviolet light emitting diode 20 is brought into contact with purified water to perform sterilization, the irradiation angle range of the light emitting diode is limited, and light is refracted inside the purified water, so that sufficient sterilization cannot be performed. That is, the ultraviolet light emitting diode 20 is disposed to be separated from the purified water, and the sterilization efficiency is further increased.

On the other hand, the plurality of water level detection sensors 50 may include a water level detection sensor 50 for detecting whether a full water level is reached, in which case the supply of purified water to the water storage tank 10 is blocked by blocking the water inlet valve 213 shown in fig. 2. For example, among the water level detection sensors 50, the water level detection sensor 50 in which one end portion of the water level detection sensor 50 is disposed at the highest position may be understood as a full water level detection sensor.

Therefore, the purified water can be prevented from excessively flowing into the interior of the sump 10. The water level detection sensor 50 can cause the purified water to flow to a predetermined position, thereby allowing the light emitting section 23 of the ultraviolet light emitting diode 20 to be spaced apart from the surface of the purified water by a predetermined distance. The light emitting unit 23 of the ultraviolet light emitting diode 20 is configured to emit light while maintaining a predetermined irradiation angle on the surface of the clean water.

Even when the water inlet valve 213 is blocked, the purified water passing through the circulation pipe 42 can flow into the water storage tank 10 through the inlet 13 in a state where the circulation sterilization is performed.

In the present invention, the circulation sterilization means that the purified water is circulated through the circulation flow path 42a formed in the circulation pipe 42 by the circulation pump 48, and the purified water inside the water storage tank 10 is sterilized by the ultraviolet light emitting diode 20.

The ultraviolet light emitting diode 20 includes a light emitting portion 23, a printed circuit board substrate 25, and a wire portion 27. In the explanation of fig. 6, the detailed structure of the ultraviolet light emitting diode 20 will be described.

The power supply unit 30 supplies power to the ultraviolet light emitting diode 20. The power supply unit 30 may be electrically connected to the control unit 35 to suppress turning on/off of the ultraviolet light emitting diode 20 and the circulation pump 48. On the other hand, the power supply unit 30 may be directly electrically connected to the ultraviolet light emitting diode 20 to supply power to the ultraviolet light emitting diode 20.

The power supply unit 30 can simultaneously supply power to the ultraviolet light emitting diode 20 and the circulation pump 48 and simultaneously turn off the same, so that the on/off operation of the ultraviolet light emitting diode 20 and the on/off operation of the circulation pump 48 can be simultaneously controlled.

The circulation pipe 42 has a circulation passage 42a formed inside the circulation pipe 42, and the circulation pipe 42 can be understood as a passage through which the circulation passage 42a communicates with the outlet 17 and the inlet 13 to move the stored clean water. The purified water stored in the water storage tank 10 flows through the circulation flow path 42a via the outlet 17 and flows into the inlet 13.

Referring to fig. 3 and 4, one side of the circulation pipe 42 is connected to the outlet 17, and the other side of the circulation pipe 42 is connected to the inlet 13. The circulation pipe 42 may extend between the bottom surface of the water storage tank 10 and the lid 12 of the water storage tank 10, and the circulation pipe 42 may be provided at a side surface of the water storage tank 10 in a spaced manner.

The circulation pipe 42 may include a first circulation pipe 43, a second circulation pipe 44, and a third circulation pipe 45.

The first circulation pipe 43 is formed to be spaced apart from the bottom surface of the water storage tank 10, and forms a first circulation flow path 43 a. Fig. 3 and 4 show an example of the first circulation pipe 43 arranged in parallel with the bottom surface 16 of the water storage tank 10.

The second circulation pipe 44 is spaced apart from the side surface of the water storage tank 10, and the second circulation pipe 44 is connected to the first circulation pipe 43 and extends in the vertical direction between the first circulation pipe 43 and the third circulation pipe 45. The second circulation pipe 44 may be formed in parallel with the side surface of the water storage tank 10, and a second circulation flow path 44a is formed in the second circulation pipe 44.

The third circulation pipe 45 is connected to the inlet 13 and the second circulation pipe 44, respectively, and at least a part of the third circulation pipe is spaced apart from the lid 12 of the water storage tank 10 by a predetermined distance. For example, the third circulation pipe 45 may be formed in parallel with the lid 12, and the third circulation pipe 45 may be provided with a third circulation pipe 45 a.

As described above, the first to third circulation passages 43a, 44a, and 45a are formed in the first to third circulation pipes 43, 44, and 45, respectively, and the purified water in the water storage tank 10 circulates along the first to third circulation passages 43a, 44a, and 45 a.

A circulation pump 48 is disposed on the outlet 17 side of the circulation pipe 42. The circulation pump 48 circulates a part of the purified water stored in the water storage tank 10 by supplying power to the circulation flow path 42a formed in the circulation pipe 42.

The circulation pump 48 may be a general pump, a drain pump, or the like, and the circulation pump 48 may be a general structure that generates power to move fluid, which is not described in the description of the present invention.

The water purification system 200 provided with the sterilization device 100 according to the present invention may further include a control unit 35, and the control unit 35 may include an ultraviolet light emitting diode control unit 36 and a circulation pump control unit 38. The ultraviolet light emitting diode control unit 36 is electrically connected to the ultraviolet light emitting diode 20, and the circulation pump control unit 38 is electrically connected to the circulation pump 48. As described below, the ultraviolet light emitting diode control section 36 is electrically connected to the light emitting section 23 via the electric wire section 27 of the ultraviolet light emitting diode 20.

The control part 35 operates according to the water level of the purified water stored in the water storage tank 10, the ultraviolet light emitting diode control part 36 controls the operation time of the ultraviolet light emitting diode 20 and the intensity of the ultraviolet light emitting diode 20, respectively, and the circulation pump control part 38 controls the operation time of the circulation pump 48. The control part 35 may be connected to a water level detection sensor 50 to detect the water level or full water level of purified water by the water level detection sensor 50.

On the other hand, the control unit 35 may be electrically connected to the power supply unit 30, and may transmit the electric power received from the power supply unit 30 to the ultraviolet light emitting diode 20 and the circulation pump 48, thereby simultaneously operating the ultraviolet light emitting diode 20 and the circulation pump 48 during sterilization.

The circulation pipe 42 and the circulation pump 48 described above may be understood as the circulation module 40 that circulates the purified water stored in the water storage tank 10. As described above, the circulation module 40 circulates the purified water stored in the water storage tank 10, and the ultraviolet light emitting diode 20 irradiates light to sterilize the purified water inside the water storage tank 10. Therefore, the dead zone (dead zone)5 of the water storage tank 10 or the bottom surface 16 of the water storage tank 10, which has not been sufficiently sterilized in the past, can be sterilized, and the sterilization performance can be improved.

Fig. 6 is a perspective view showing the inside of the water storage tank 10 cut away. Fig. 7 is a perspective view showing the upper portion of the water storage tank 10.

The structure of the ultraviolet light emitting diode 20 and the coupling relationship between the ultraviolet light emitting diode 20 and the cover 12 will be described with reference to fig. 6 and 7.

The ultraviolet light emitting diode 20 includes a light emitting portion 23, a printed circuit board substrate 25, and a wire portion 27. The ultraviolet light emitting diode 20 may further include a printed circuit board case 26, and the printed circuit board case 26 may be connected to the printed circuit board substrate 25 via a wire portion 27.

The light emitting part 23 may receive power from the power supply part 30 to generate light, and may sterilize purified water by irradiating the generated light. The light emitting unit 23 may be disposed at a position higher than the water level detection sensor 50 located at the highest position among the plurality of water level detection sensors 50, and may irradiate light onto the surface of the purified water. The light irradiated to the surface of the purified water is refracted to flow into the purified water, and the purified water is sterilized. For example, the light emitting section 23 can be understood as a general light emitting diode light emitting element.

Referring to fig. 7, the light emitting unit 23 is inserted into the holder cover 12b inside the water storage tank 10. The light emitting unit 23 irradiates the clean water stored in the water storage tank 10.

The light emitting portion 23 can be electrically connected to the printed circuit board substrate 25 by means of an electric wire 23 a.

The printed circuit board substrate 25 is electrically connected to the light emitting part 23, and the printed circuit board substrate 25 may be combined with an upper portion of the holder cover 12 b. For example, referring to fig. 7, the printed circuit board substrate 25 may be coupled to the side opposite to the light emitting portion 23 via the holder cover 12 b. The printed circuit board substrate 25 may be provided with a plurality of elements for operating the light emitting part 23 or controlling the light emitting part 23, and the light emitting part 23 is connected to the plurality of elements of the printed circuit board substrate 25 to control the light emitting part 23.

The printed circuit board case 26 is provided on the upper portion of the holder cover 12b so as to cover a part of the printed circuit board substrate 25 or cover components of the printed circuit board substrate 25. Also, the printed circuit board housing 26 may connect the wire portion 27 with the printed circuit board substrate 25. For this purpose, the printed circuit board case 26 may be formed with a passage through which the wire portion 27 passes.

The wire portion 27 may be electrically connected to the printed circuit board substrate 25 so that the power supplied from the power supply portion 30 may be supplied to the light emitting portion 23. The wire portion 27 may be understood as e.g. a wire harness (harness) by gluing the terminals and suitably machining. Wire portion 27 is electrically connected to power supply portion 30 and control portion 35, and supplies power to light emitting portion 23, and controls the operating time and light emission intensity of light emitting portion 23.

Fig. 7 shows an example in which the ultraviolet light emitting diode 20 is provided in the holder cover 12b, but the structure of the ultraviolet light emitting diode 20 is not limited thereto, and the specific structure of the ultraviolet light emitting diode 20 may be partially changed.

The light emitting unit 23, the printed circuit board substrate 25, the printed circuit board case 26, and the like are provided in the holder cover 12b, and the effects obtained by providing the ultraviolet light emitting diode 20 in the holder cover 12b are not significantly different from each other, and the description thereof has been given above.

Fig. 8A is a schematic view showing a first experimental example in which the ultraviolet light emitting diode 20 is provided on the bottom surface of the water storage tank, and fig. 8B is a schematic view showing a first experimental example in which the ultraviolet light emitting diode 20 is provided on the lid 12 of the water storage tank 10.

In the first experimental example, the ultraviolet light emitting diodes 20 were provided on the bottom surface 16 of the water storage tank 10 and the lid 12 of the water storage tank 10, respectively, and the result values relating to the sterilization efficiency were shown.

In fig. 8A and 8B, referring to the position where ultraviolet light emitting diode 20 is provided in the first experimental example, ultraviolet light emitting diode 20 is provided on bottom surface 16 of water storage tank 10 and lid 12 of water storage tank 10, respectively, and experiments were performed to determine which of the two positions the sterilization efficiency is higher. The ultraviolet light emitting diode 20 in fig. 8A and 8B is provided at a position different from the position where it is provided on the cover 12 of the water storage tank 10 and the bottom surface 16 of the water storage tank 10, respectively, and is in direct contact with the purified water. Therefore, a difference in sterilization efficiency may occur, and the sterilization efficiency will be described in more detail in the description of the graph in fig. 9, fig. 10A, fig. 10B, and the like.

Fig. 9 is a graph showing the results of the first experimental example in fig. 8A and 8B, and fig. 10A shows simulation data indicating the sterilization range relating to the first experimental example in fig. 8A. Fig. 10B shows simulation data indicating the sterilization range in the first experimental example of fig. 8B

Referring to fig. 9, in the first experimental example, when ultraviolet light emitting diodes 20 were provided on the cover 12 of water storage tank 10 and on the lower side of water storage tank 10, the amount of bacteria (bacteria reduction rate) was measured after a predetermined time had elapsed, and the sterilization performance was confirmed.

The graph in fig. 9 shows the result of the ultraviolet light emitting diode 20 being disposed at the lower side of the water storage tank 10 (CASE 1) and the result of the ultraviolet light emitting diode 20 being disposed at the lid 12 of the water storage tank 10 (CASE 2).

After the water storage tank 10 was filled with 4L and 8L of water, an experiment was performed by putting a strain of coliform bacteria into the water storage tank 10 and operating the ultraviolet light emitting diode 20 attached to the water storage tank 10.

The amount of water of 4L is Half the volume of the reservoir 10 (Half), and the amount of water of 8L corresponds to the entire volume of the reservoir 10 (Full). However, when the water volume is 8L, the cover 12 of the water storage tank 10 is spaced apart from the surface of the stored clean water by a predetermined distance, and therefore, when the ultraviolet light emitting diode 20 is provided on the cover 12 of the water storage tank 10, it does not come into contact with the clean water.

In case of 4L of water, in case1 where the ultraviolet light emitting diode 20 is provided on the bottom surface 16 of the water storage tank 10, the initial bacterial count is 3.1X 10^∧6CFU (Colony Forming Unit)/ml, and reduces the bacterial count to 4.4X 10^∧5CFU/ml (85.8% bacteria reduction rate) took 15 minutes, reducing the bacteria count to 9.5X 10^∧4CFU/ml (86.9% bacteria reduction rate) took 30 minutes.

In contrast, in case 2 in which the ultraviolet light emitting diode 20 was provided in the lid 12 of the water storage tank 10, the initial bacterial count was 3.1 × 10, which was the same as in case1^∧6CFU/ml, however, 10 minutes, the bacterial load was 7.5X 10^∧2CFU/ml (99.9% bacteria reduction rate), almost all coliform bacteria were eliminated.

On the other hand, in case of the water amount of 8L, in case1 in which the ultraviolet light emitting diode 20 was provided on the bottom surface 16 of the water storage tank 10, the initial bacterial amount was 1.9X 10^∧6CFU/ml, reduced the bacterial count to 3.7X 10^∧5CFU/ml (80.5% bacteria elimination rate) took 10 minutes, reducing the bacteria count to 1.3X 10^∧5CFU/ml (93.1% bacterial elimination) took 30 minutes.

In contrast, in case 2 in which the ultraviolet light emitting diode 20 was provided in the lid 12 of the water storage tank 10, the initial bacterial count was 1.9X 10 as in case1^∧6CFU/ml, however, at 10 minutes, the bacterial load was 8.5X 10^∧4CFU/ml (99.9% bacteria elimination), 15 minutes, the bacterial count is 5.2X 10^∧4CFU/ml (97.2% bacteria elimination), almost all coliform bacteria were eliminated.

That is, analyzing the graph of the first experimental example, it was confirmed that the time for the ultraviolet light emitting diode to reach the bacteria reduction rate of 90% or more was about 3 times faster in the case where the ultraviolet light emitting diode was provided in the lid 12 of the water storage tank 10 (case 2) than in the case where the ultraviolet light emitting diode was provided in the bottom surface 16 of the water storage tank 10 (case 1).

Referring to fig. 10a and 10b, it was confirmed that, in terms of time taken for complete sterilization, when the amount of purified water stored in water storage tank 10 reached about half (half-7 cm) of water storage tank 10, it took 15 minutes for the case (case 2) where ultraviolet light emitting diode 20 was provided on bottom surface 16 of water storage tank 10, and 10 minutes for the case (case 2) where ultraviolet light emitting diode 20 was provided on lid 12 of water storage tank 10. Therefore, it was confirmed that the time taken for complete sterilization is faster in the case where the ultraviolet light emitting diode 20 is provided on the lid 12 of the water storage tank 10 (case 2) than in the case where the ultraviolet light emitting diode 20 is provided on the bottom surface 16 of the water storage tank 10 (case 1).

Finally, it was confirmed that the structure (case 2) in which the ultraviolet light emitting diode 20 is provided in the lid 12 of the water storage tank 10 is more advantageous in the sterilization performance than the structure (case 1) in which the ultraviolet light emitting diode 20 is provided in the bottom surface 16 of the water storage tank 10.

Hereinafter, it is analyzed in the second experimental example which position the ultraviolet light emitting diode 20 is located on the lid 12 of the water storage tank 10.

Fig. 11A is a schematic view showing a second experimental example in which the ultraviolet light emitting diode 20 is provided at the center of the cover 12 of the water storage tank 10, and fig. 11B is a schematic view showing a second experimental example in which the ultraviolet light emitting diode 20 is provided adjacent to the vicinity of the inflow port of the water storage tank. Fig. 11C is a schematic diagram showing a second experimental example in which the ultraviolet light emitting diode 20 is provided on the opposite side of the inflow port 13 of the cover 12 of the water storage tank 10.

Although the second experimental example is not shown in the drawings, according to the simulation data, the purified water in the water storage tank 10 flows more actively with respect to the side of the water storage tank 10 than in the central portion of the water storage tank 10, and particularly, the purified water flows most actively in the vicinity of the inflow port 13. Since the purified water discharged from the outlet 17 is supplied in a circulating manner, all the purified water passes through the vicinity of the inlet 13.

This is because, as described above, in the upper left side in fig. 5 where the purified water flows in the water storage tank 10 through the inflow port 13, the flow of the purified water is most active, and the ultraviolet light emitting diode 20 is disposed near the inflow port 13, so that the purified water can be circulated at a large flow rate and sterilized at the same time.

Therefore, in terms of sterilization efficiency, it is most advantageous to irradiate the ultraviolet light emitting diode 20 with light in the vicinity of the most active flow of purified water and all the circulated purified water flows. Therefore, the ultraviolet light emitting diode 20 should irradiate light to the vicinity of the inflow of the purified water through the inflow port 13, and the ultraviolet light emitting diode 20 should be disposed in the vicinity of the inflow port 13. Fig. 6 shows an example in which the light emitting unit 23 of the ultraviolet light emitting diode 20 is provided in the vicinity of the inlet 13.

As described above, as shown in fig. 11B, the ultraviolet light emitting diode 20 is provided in the vicinity adjacent to the inflow port 13, which is advantageous in that the entire inside of the water storage tank 10 is irradiated with light, as compared with the ultraviolet light emitting diode 20 provided in fig. 11A or 11C.

Of course, if the entire ultraviolet light emitting diode 20 is provided above the water storage tank 10 to irradiate the purified water in the water storage tank, the sterilizing effect of the purified water can be increased. However, if the entire ultraviolet light emitting diode 20 is provided above the water storage tank 10, the number of ultraviolet light emitting diodes 20 may increase, which may increase the manufacturing cost. Therefore, as described above, the ultraviolet light emitting diodes 20 are disposed in the vicinity of the inflow port 13, and the purified water is circulated and sterilized by the circulation module 40, so that the light of the ultraviolet light emitting diodes 20 is irradiated to the vicinity of all the inflow ports 13 through which the purified water passes, thereby being most advantageous in terms of sterilization efficiency.

As described above, a part of the stored purified water is circulated by the circulation pump 48 connected to the circulation pipe 42, and the ultraviolet light emitting diode 20 is disposed near the inflow port 13, thereby maximizing the sterilization efficiency of the circulated purified water.

Fig. 12 is a flowchart of a sterilization method using the water purification system 200 provided with the sterilization device shown in fig. 3.

Referring to fig. 12, the method for sterilizing the ultraviolet light emitting diode 20 (step S100) of the sterilization apparatus using the ultraviolet light emitting diode 20 according to the present invention includes: a step of sterilizing the purified water stored in the water storage tank 10 by operating the ultraviolet light emitting diode (step S10); a step of circulating a part of the stored purified water through a circulation flow path by a circulation pump 48 (step S20); and controlling the operation time of the ultraviolet light emitting diode, the intensity of the ultraviolet light emitting diode, and the operation time of the circulation pump based on the water level of the water storage tank 10 measured by the water level detection sensor 50 (step S30).

First, in order to sterilize the ultraviolet light emitting diode 20, the ultraviolet light emitting diode 20 is provided in the cover 12 inside the water storage tank 10. In particular, as described above, in order to maximize the efficiency of the cyclic sterilization, the ultraviolet light emitting diode 20 may be disposed in the vicinity of the inflow port 13. The power supply unit 30 is operated, and the ultraviolet light emitting diode 20 and the circulation pump 48 are operated by the control unit 35. Thus, the sterilization is started by the irradiation of the light from the ultraviolet light emitting diode 20 to the purified water, and the purified water stored in the water storage tank 10 is circulated along the outlet 17, the circulation flow path 42a, and the inlet 13 by the operation of the circulation pump 48.

At this time, the control unit 35 is connected to the water level detection sensor 50, and the control unit 35 controls the operation time and intensity of the ultraviolet light emitting diode 20 and the operation time of the circulation pump 48 according to the water level of the purified water stored in the water storage tank 10. For example, the control unit 35 may simultaneously operate and stop the ultraviolet light emitting diode 20 and the circulation pump 48. Of course, the control unit 35 may control the ultraviolet light emitting diode 20 and the circulation pump 48 to operate independently, taking into consideration the sterilization effect of purified water and the amount of purified water to be circulated.

The purified water in the water storage tank 10 is circulated by the circulation module 40 including the circulation pipe 42 and the circulation pump 48, and the purified water is sterilized by the ultraviolet light emitting diode 20, so that the sterilization efficiency can be improved and the life of the ultraviolet light emitting diode 20 can be extended.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The foregoing detailed description is, therefore, not to be construed as limiting the invention in all respects, but is to be regarded as illustrative. The scope of the invention is to be determined by reasonable interpretation of the appended claims and all changes which come within the equivalent scope of the invention belong to the scope of the invention.

The water purification system provided with a sterilizer of the present invention is provided with a circulation pipe outside a water storage tank, and the circulation pipe is connected to a circulation pump for supplying power to the circulation pipe, thereby circulating purified water inside the water storage tank. Therefore, the purified water stored in the water storage tank can be sterilized as a whole.

In the water purification system provided with the sterilization device of the present invention, the water inside the water storage tank is circulated by the circulation pipe and the circulation pump, and the purified water at the lower end of the water storage tank is finally sterilized. Therefore, the time for sterilizing the water in the water storage tank can be shortened, and the service life of the ultraviolet light emitting diode can be prolonged.

In addition, the water purification system with the sterilization device of the present invention is provided with a water level detection sensor inside the water storage tank to detect the water level inside the water storage tank, and can control the intensity of the ultraviolet light emitting diode, the operating time of the ultraviolet light emitting diode, and the operating time of the circulation pump according to the water level.

On the other hand, the water purification system provided with the sterilization device of the present invention is provided with the ultraviolet light emitting diode at the inlet side of the upper surface inside the water storage tank, thereby further increasing the sterilization efficiency.

The water purification system with a sterilization device of the present invention can form a stable combination structure of the ultraviolet light emitting diode and the water level detection sensor even when the tank cover is opened or closed by arranging the inflow port, the ultraviolet light emitting diode and the water level detection sensor on the bracket cover.

In addition, the structure of the present invention in which the ultraviolet light emitting diode is provided on the upper side of the cover can be maintained by replacing the printed circuit board substrate, the light emitting part, and the like provided on the holder cover. Therefore, the structure of the present invention is advantageous in maintenance and repair compared to a conventional structure in which the light source is provided inside the pipe, and in the conventional structure, when maintenance and repair are performed on the halogen lamp light emitting part or the like, it is necessary to detach the pipe itself and perform the maintenance.

Claims (3)

1. A water purification system is characterized in that,

the method comprises the following steps:

a filter unit including one or more filters for filtering raw water supplied from the outside;

a water storage tank including an inlet through which the purified water filtered by the filter unit flows in and an outlet through which the purified water flows out, the water storage tank storing the purified water;

a cover for forming an upper surface of the water storage tank to cover the water storage tank; and

a sterilizing device connected to the filter unit and capable of circulating and sterilizing a part of the purified water passing through the filter unit,

the above-mentioned sterilizing equipment includes:

an ultraviolet light emitting diode provided on an upper side of an inside of the water storage tank, and configured to be spaced apart from a surface of the stored purified water and directly face the surface of the purified water, and irradiate ultraviolet rays to the purified water in a state of not contacting the purified water, thereby sterilizing the stored purified water;

a circulation pipe provided outside the water storage tank, the circulation pipe communicating with the inlet and the outlet to form a circulation flow path of the purified water stored in the water storage tank; and

a circulation pump connected to the circulation pipe at a lower end of the water storage tank, the circulation pump circulating a part of the stored purified water by supplying power to a circulation flow path,

the above-mentioned lid includes:

a holder cover connected to an upper end of a side surface of the water storage tank to form a part of the cover, and formed of a plastic material; and

a tank cover which is combined with the bracket cover in an openable and closable manner to form the upper surface of the water storage tank,

a water level detection sensor is further provided in the water storage tank on the holder cover, the water level detection sensor is used for measuring the water level of the purified water,

the inlet is disposed on one side of the holder cover, and the ultraviolet light emitting diode includes:

a light emitting unit that is provided in the holder cover inside the water storage tank and that can sterilize the stored purified water by irradiating the stored purified water with light;

a printed circuit board substrate electrically connected to the light emitting part, the printed circuit board substrate being combined with the holder cover; and

a wire section electrically connected to the printed circuit board substrate and capable of supplying power supplied from a power supply section to the ultraviolet light emitting diode to the light emitting section,

the ultraviolet light emitting diode is disposed on the holder cover and adjacent to the inflow port, the ultraviolet light emitting diode is disposed higher than the water level detection sensor, the ultraviolet light emitting diode irradiates light to the surface of the purified water stored in the water storage tank at a predetermined irradiation angle,

the outlet is disposed on the other side of the bottom surface of the water storage tank and in a diagonal direction of the inlet so that the purified water can form a convection in the water storage tank.

2. The water purification system of claim 1, wherein said uv led further comprises a printed circuit board housing, said printed circuit board housing being coupled to said printed circuit board substrate to enable connection of said printed circuit board substrate to said wire portion.

3. The water purification system of claim 1, further comprising a control unit electrically connected to the ultraviolet light emitting diode and the circulation pump, wherein the control unit controls at least one of an operation time of the ultraviolet light emitting diode, an intensity of the ultraviolet light emitting diode, and an operation time of the circulation pump according to a water level of the purified water.

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