KR20180042197A - Induction heating module and water purifier having the same - Google Patents

Abstract

The present invention provides a water purifier having a structure capable of accurately controlling an induction heating output for each individual water purifier even if the water purifier including an induction heating module is mass-produced. The water purifier comprises: a working coil; a hot water tank located to face the working coil at a position separated from the working coil, and induction-heated by the working coil so as to heat liquid passing through an internal space; a bracket coupled to the hot water tank with the working coil interposed therebetween; and a spacer located between the working coil and the hot water tank to maintain a constant gap between the working coil and the hot water tank, and formed to maintain a constant thickness even when being pressurized by coupling of the hot water tank and the bracket.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating module,

The present invention relates to a water purifier for generating hot water by an induction heating method.

In general, a water purifier is a device that converts various harmful components contained in raw water such as tap water and ground water into various safe harmful components by converting the harmful components into safe and hygienic drinking water.

For this purpose, the water purifier forms a cold water passage, a hot water passage and a purified water passage so that the purified water passing through the filter can be supplied to the water outlet portion according to the user's selection, and controls the flow of water by using a mechanical or electromagnetic valve .

The water purifier can be classified into a water tank type and a direct water type depending on whether or not a water tank is provided. The water tank type water purifier stores the purified water in the water tank, and when the user manipulates the water outlet, the purified water is supplied to the water tank. On the contrary, the water purifier does not have a water tank, and when the user manipulates the water outlet, the water is immediately filtered to provide the user with purified water. The direct water type water purifier is recognized as being hygienic and water saving as compared with the water tank type water purifier, and recently user's preference for direct water type water purifier is increasing.

The water purifier also provides hot water and cold water in addition to normal temperature water. The water purifier for supplying hot water and cold water has a separate heating device and cooling device inside thereof. The heating device is configured to generate hot water by heating the purified water, and the cooling device is configured to cool the purified water to generate cold water.

In order for the water purifier to provide hot or cold water, the water purifier must be able to heat or cool the water within a short time. There are various ways in which the heating device heats the purified water in a short time.

For example, Korean Patent Registration No. 10-0817832 (Mar. 31, 2008) discloses a configuration in which purified water is heated using a surface heating heater. Korean Patent Laid-Open Publication No. 10-2005-0103723 (November 11, 2005) discloses a configuration for heating a purified water by an induction heating method.

Induction heating refers to a method of heating an object to be heated using electromagnetic induction. When an electric current is supplied to the coil, an eddy current is generated in the heating target, and the joule heating generated by the resistance of the metal increases the temperature of the heating target.

The output value of the induction heating varies depending on the distance between the coil and the heating target. For example, when the output value of the induction heating exceeds the normal range (high output), water is boiled and steam is generated. Conversely, if the induction heating output value is below the normal range (low output power), the constant can not be heated sufficiently.

Therefore, it is very important to maintain a constant distance between the coil and the heating target. However, the techniques disclosed in the prior art are not sufficiently disclosed for the means capable of maintaining a constant distance between the coil and the heating target.

A first object of the present invention is to propose a water purifier including a spacer disposed between a working coil and a hot water tank to maintain a constant gap between a working coil and a hot water tank.

A second object of the present invention is to provide an assembly structure in which a uniform gap between the working coil and the hot water tank can be maintained even when the working coil, the hot water tank and the spacer are assembled without a sealant.

A third object of the present invention is to propose a water purifier having a structure capable of accurately controlling the induction heating output for each individual water purifier even if the water purifier including the induction heating module is mass-produced.

A fourth object of the present invention is to provide a water purifier having a structure capable of suppressing the heat generated in the working coil and the hot water tank from being transmitted to the adjacent components.

A fifth object of the present invention is to propose a water purifier having a structure capable of cooling a working coil while maintaining a constant gap between a working coil and a hot water tank.

The induction heating module of the present invention includes a working coil, a hot water tank which is inductively heated by a working coil, and a spacer disposed between the working coil and the hot water tank so as to maintain a constant gap between the working coil and the hot water tank.

The spacer is a structure capable of passing both ends of the working coil, (1) maintaining a constant gap between the working coil and the hot water tank, (2) electrical insulation, (3) suppressing heat transfer, (4) , And (6) a cooling coil cooling coil.

In order to satisfy the above conditions, the spacers may be formed of mica, quartz, glass or silicon.

Also, to satisfy the above condition, the spacer is formed in an annular shape, the first part of the spacer forms a part of the annular shape, the second part of the spacer forms the remaining part of the annular shape and has a narrower width than the first part.

Further, in order to satisfy the above condition, the spacer has a hole for facing the hot water tank and the working coil to each other.

One surface of the spacer is brought into close contact with the hot water tank and the other surface of the spacer is brought into close contact with the working coil so that the distance between the hot water tank and the working coil is determined by the thickness of the spacer. The plurality of spacers may be provided, and in this case, the plurality of spacers are disposed in close contact with each other. The hot water tank and the bracket are connected to each other by screws with the working coil and the spacer interposed therebetween.

Specifically, the brackets are provided with a plurality of bosses spaced apart from each other, and the hot water tank and the brackets are coupled to each other by screws inserted into the bosses. When the combination of the hot water tank and the bracket is completed, the rim of the hot water tank is disposed between the head of the screw and the boss portion.

The bracket includes a base portion, a boss portion, a hot water tank support portion, a position fixation portion, a core accommodating portion, a temperature sensor accommodating portion, and an overheat prevention fuse accommodating portion, and fixes the components of the induction heating module inside the purifier body.

The insulator is composed of (1) electrical insulation, (2) heat transfer suppression, (3) flame retardant having heat resistance, (4) a structure capable of passing both ends of a working coil, Condition.

In order to satisfy the above conditions, the insulator may be formed of mica, quartz, glass or silicon.

Also, the insulator is formed in an annular shape to satisfy the above condition, wherein the first portion of the insulator forms a part of the annular shape, the second portion of the insulator forms the remaining part of the annular shape and has a narrower width than the first portion.

Further, the insulator has a hole to satisfy the above condition.

In order to accomplish the above object, the present invention discloses a water purifier including an induction heating module. The water purifier has a solution to the problem of the induction heating module.

According to the present invention, since the spacer disposed between the hot water tank and the working coil is formed of mica, quartz or glass, it can be made to maintain a constant gap between the hot water tank and the working coil.

Especially, even if the spacer is squeezed as the hot water tank and the bracket are joined to each other by the screw, the thickness of the spacer can be kept constant. Since the spacer keeps close contact with the hot water tank and the working coil, the gap between the hot water tank and the working coil is determined by the spacer. Therefore, the fact that the thickness of the spacer can be kept constant means that the gap between the hot water tank and the working coil can be kept constant.

Even if the hot water tank and the bracket are coupled to each other by screws, the gap between the hot water tank and the working coil can be kept constant. Therefore, according to the structure of the present invention, the positions of the working coil, the hot water tank and the spacer are fixed without a sealant .

Furthermore, since the screw fastening structure unlike the sealant does not cause different results depending on the process, the structure of the present invention is advantageous for mass production.

Since the spacer and the insulator are formed of mica, quartz, glass or silicon, the effect of suppressing heat transfer can be obtained in the present invention. Particularly, heat generated from the induction heating module may be transmitted to adjacent components, which may cause heat damage. However, if the heat transfer is suppressed by the spacer and the insulator, heat damage can be prevented.

The spacer and the insulator are provided with holes to ensure a contact area between the working coil and the air. Therefore, air cooling of the working coil can be realized while maintaining a constant gap between the working coil and the hot water tank.

1 is a perspective view showing the appearance of a water purifier according to the present invention.
2 is an exploded perspective view showing the internal structure of a related purifier of the present invention.
3 is a conceptual view showing a flow path configuration of a water purifier according to the present invention.
4 is an exploded perspective view of an induction heating module and a control module related to the present invention.
5 is an exploded perspective view showing some components of an induction heating module related to the present invention.
6 is a side view showing a configuration corresponding to line AA of FIG. 5 to show a coupling structure of the induction heating module.

1 is a perspective view showing a water purifier 1000 of the present invention.

The water purifier 1000 includes a cover 1010, a water outlet 1020, a base 1030, and a tray 1040.

The cover 1010 forms the appearance of the water purifier 1000. The appearance of the water purifier 1000 formed by the cover 1010 may be referred to as the body of the water purifier 1000. Parts for filtering the raw water are installed inside the purifier 1000 body. A cover 1010 surrounds the parts to protect the parts. The name of the cover 1010 may be changed to a case or a housing or the like. Any name is equivalent to the cover 1010 described in the present invention if it is configured to form an outer appearance of the water purifier 1000 and to enclose parts for filtering raw water.

The cover 1010 may be formed as a single part, but may be formed by a combination of several parts. 1, the cover 1010 may include a front cover 1011, a rear cover 1014, a side panel 1013a, an upper cover 1012, and a top cover 1015, for example.

The front cover 1011 is disposed in front of the water purifier 1000. The rear cover 1014 is disposed behind the water purifier 1000. Here, the forward and backward directions of the water purifier 1000 are set based on the direction in which the water head 1020 faces the user's eyes. However, since the concept of forward and backward of the water purifier 1000 is not absolute, it may vary depending on the manner of describing the water purifier 1000. [

The side panels 1013a are disposed on the right and left sides of the water purifier 1000, respectively. The side panel 1013a is disposed between the front cover 1011 and the rear cover 1014. The side panels 1013a can be coupled with the front cover 1011 and the rear cover 1014, respectively. The side panel 1013a substantially forms the side surface of the water purifier 1000.

The upper cover 1012 is disposed in front of the water purifier 1000. The upper cover 1012 is installed at a position higher than the front cover 1011. The water outlet portion 1020 is exposed to the space between the upper cover 1012 and the front cover 1011. [ The upper cover 1012 together with the front cover 1011 forms an outer surface of the water purifier 1000.

The top cover 1015 forms the top surface of the water purifier 1000. An input / output unit 1016 may be formed in front of the top cover 1015. The input / output unit 1016 is a concept including an input unit and an output unit. The input unit is configured to receive a user's control command. The manner in which the input unit receives the control command of the user may include or selectively include the touch input, the physical pressure, and the like. The output unit is configured to provide the user with the state information of the water purifier 1000 audiovisually.

The take-out unit (take-out unit or cock assembly) 1020 functions to provide an integer to the user according to a control command of the user. At least a portion of the water outlet 1020 is exposed to the outside of the purifier 1000 body to supply water. In particular, in the water purifier 1000 configured to provide cold water at room temperature, cold water below room temperature, and hot water that is hotter than room temperature, at least one of ordinary temperature water, cold water, and hot water is discharged through the water outlet 1020 .

The heading unit 1020 may be configured to be rotatable according to a user's operation. The front cover 1011 and the upper cover 1012 form a rotation area of the water outlet 1020 and the water outlet 1020 can be rotated left and right in the rotation area. The rotation of the heading portion 1020 may be performed by a force physically applied to the heading portion 1020 by the user. The rotation of the heading unit 1020 may be based on a control command that the user applies to the input / output unit 1016. [ The configuration for implementing the rotation of the water outlet 1020 may be installed inside the water purifier 1000, specifically, in an area covered by the upper cover 1012. [ The input / output unit 1016 may also be configured to rotate together with the water outlet 1020 during the rotation of the water outlet 1020.

The base 1030 forms the bottom of the water purifier 1000. The internal components of the water purifier 1000 are supported by the base 1030. When the water purifier 1000 is placed on a floor or a shelf, the base 1030 faces a floor, a shelf, or the like. Therefore, when the water purifier 1000 is placed on a floor or a shelf, the structure of the base 1030 is not exposed to the outside.

The tray 1040 is disposed to face the water outlet 1020. When the water purifier 1000 is installed as shown in FIG. 1, the tray 1040 faces the water outlet 1020 in the vertical direction. The tray 1040 is formed to support a container or the like for storing purified water or the like discharged through the water outlet 1020. Further, the tray 1040 is formed to receive residual water falling from the water outlet 1020. When the tray 1040 receives and receives residual water falling from the water outlet 1020, contamination due to residual water around the water purifier 1000 can be prevented.

Since the tray 1040 has to receive the remaining amount of water falling from the water outlet 1020, the tray 1040 can also be configured to rotate together with the water outlet 1020. The input / output unit 1016 and the tray 1040 are preferably configured to rotate in the same direction as the heading unit 1020.

FIG. 2 is an exploded perspective view showing the internal structure of the water purifier 1000 shown in FIG.

The filter portion 1060 is provided inside the front cover 1011. [ The filter unit 1060 is configured to filter the raw water supplied from the raw water supply unit to generate purified water. The filter unit 1060 may include a plurality of unit filters 1061 and 1062 since only one filter may be difficult to generate an appropriate integer for the user to drink. The unit filters 1061 and 1062 may include a prefilter such as a carbon block or an adsorption filter, a HEPA filter (High Efficiency Particulate Air filter), a UF filter (Ultra Filteration or Ultra Filteration filter) High-performance filters. Although two unit filters 1061 and 1062 are provided in FIG. 2, the number of unit filters 1061 and 1062 can be expanded or reduced as needed.

The plurality of unit filters 1061 and 1062 are connected in a predetermined order. The predetermined order is a proper order for the filter unit 1060 to filter the water. The raw water may contain various foreign substances. Large particles such as hair or dust cause deterioration of the filtering performance of high performance filters such as HEPA filters or UF filters, and these high performance filters must be protected from large particles such as hair and dust. Therefore, in order to protect the high-performance filters, a pre-filter must be installed upstream of the high-performance filters.

The pre-filter is made to remove large particles from the water. When the pre-filter is disposed upstream of the high-performance filters to remove the large particles contained in the raw water first, raw water not containing large particles is supplied to the high-performance filter, so that the high-performance filters can be protected. The raw water that has passed through the prefilter is then filtered by a HEPA filter or a UF filter.

The integer generated by the filter unit 1060 may be provided to the user directly through the heading unit 1020. In this case, the temperature of the purified water provided to the user corresponds to room temperature. Alternatively, the constants generated by filter portion 1060 can be heated by induction heating module 1100 or cooled by cold water tank assembly 1200.

The filter bracket assembly 1070 is a structure that fixes the unit filters 1061 and 1062 of the filter unit 1060 and fixes components such as outflow passages such as purified water and cold water, valves, and sensors.

The lower portion 1071 of the filter bracket assembly 1070 is engaged with the tray 1040. The lower portion 1071 of the filter bracket assembly 1070 is formed to receive the projecting engagement portion 1041 of the tray 1040. The engagement of the filter bracket assembly 1070 and the tray 1040 is achieved as the projecting engagement portion 1041 of the tray 1040 is inserted into the lower portion 1071 of the filter bracket assembly 1070.

The lower portion 1071 of the filter bracket assembly 1070 and the tray 1040 have curved surfaces corresponding to each other. The lower portion 1071 of the filter bracket assembly 1070 can be independently rotated relative to the rest of the filter bracket assembly 1070.

The upper portion 1072 of the filter bracket assembly 1070 is configured to support the water outlet 1020. The upper portion 1072 of the filter bracket assembly 1070 forms a rotation path of the water outlet portion 1020. The water outlet 1020 can be divided into a take-out cork part 1021 protruding outside the water purifier 1000 and a rotation part 1022 disposed inside the water purifier 1000. The rotating portion 1022 may be formed in a circular shape for rotation as shown in Fig. The rotation portion 1022 is mounted on the upper portion 1072 of the filter bracket assembly 1070. The water outlet 1020 mounted on the upper portion 1072 of the filter bracket assembly 1070 is configured to be rotated relative to the filter bracket assembly 1070.

The lower portion 1071 and the upper portion 1072 of the filter bracket assembly 1070 can be connected to each other by the upper and lower connecting portions 1073. [ The lower portion 1071 and the upper portion 1072 of the filter bracket assembly 1070 connected to each other by the upper and lower connection portions 1073 can be rotated in the same direction. When the user rotates the heading portion 1020, the upper portion 1072, the upper and lower connecting portions 1073, the lower portion 1071, and the tray 1040 of the filter bracket assembly 1070 connected to the heading portion 1020, (Not shown).

A filter mounting region 1074 is formed between the lower portion 1071 and the upper portion 1072 of the filter bracket assembly 1070 to accommodate the unit filters 1061 and 1062 of the filter portion 1060. The filter installation area 1074 provides installation space for the unit filters 1061 and 1062. [

A support base 1075 protruding toward the rear of the water purifier 1000 is formed on the opposite side of the filter installation area 1074. The support 1075 is configured to support the control module 1080 and the induction heating module 1100. The control module 1080 is mounted on the support table 1075 in the induction heating module 1100. The support pedestal 1075 is disposed between the induction heating module 1100 and the compressor 1051 to block heat generated in the induction heating module 1100 from being conducted to the compressor 1051 or the like.

The control module 1080 is configured to implement overall control of the water purifier 1000. The control module 1080 may include various printed circuit boards for controlling the operation of the water purifier 1000.

The induction heating module 1100 is formed to heat the purified water generated by the filter portion 1060 to generate hot water. The induction heating module 1100 includes components capable of heating the purified water by an induction heating method. The induction heating module 1100 receives the purified water from the filter unit 1060 and the hot water generated by the induction heating module 1100 is discharged through the water outlet 1020.

The induction heating module may include a printed circuit board for controlling hot water generation. One side of the induction heating module may be coupled with a protective cover 1161 for preventing water from penetrating into the printed circuit board and protecting the printed circuit board when a fire occurs.

The refrigeration cycle apparatus 1050 is configured to generate cold water. The refrigeration cycle device 1050 refers to a set of devices in which the compression-condensation-expansion-evaporation process of the refrigerant takes place continuously. In order to generate cold water in the cold water tank assembly 1200, first, the refrigeration cycle apparatus 1050 operates to cool the cooling water filled in the cold water tank assembly 1200.

The refrigeration cycle apparatus 1050 includes a compressor 1051, a condenser 1052, a capillary tube 1053, an evaporator (not shown in the drawing), a dryer 1055, and a refrigerant passage for connecting them to each other . The refrigerant flow path may be formed by piping or the like, and the refrigerant flow path connects the compressor 1051, the condenser 1052, the expansion device 1053, and the evaporator to form a circulation flow path for the refrigerant.

The compressor 1051 is configured to compress the refrigerant. The compressor 1051 is connected to the condenser 1052 by a refrigerant passage, and the refrigerant compressed by the compressor 1051 flows to the condenser 1052 through the refrigerant passage. The compressor 1051 can be disposed under the support 1075 and is mounted to be supported by the base 1030.

The condenser 1052 is configured to condense the refrigerant. The refrigerant compressed in the compressor 1051 flows into the condenser 1052 through the refrigerant passage, and is condensed by the condenser 1052. The refrigerant condensed in the condenser 1052 flows to the dryer 1055 through the refrigerant passage.

The dryer 1055 is configured to remove moisture from the refrigerant. In order to improve the efficiency of the refrigeration cycle apparatus 1050, water must be removed from the refrigerant to be introduced into the capillary tube 1053 and the evaporator in advance. The dryer 1055 is installed between the condenser 1052 and the capillary tube 1053 and removes moisture from the refrigerant to improve the efficiency of the refrigeration cycle apparatus 1050.

The expansion of the refrigerant is realized by the capillary 1053. The capillary tube 1053 is configured to expand the refrigerant, and a throttling valve or the like may constitute an expansion device instead of the capillary tube 1053 according to the design. The capillary 1053 may be coiled in a narrow space to ensure sufficient length.

The evaporator is configured to evaporate the refrigerant and is installed inside the cold water tank assembly 1200. The cooling water filled in the cold water tank assembly 1200 and the refrigerant in the refrigeration cycle apparatus 1050 are exchanged with each other by an evaporator, and the cooling water can be maintained at a low temperature by heat exchange. And the purified water can be cooled by the cooling water kept at a low temperature.

The refrigerant heated by heat exchange with the cooling water in the evaporator is returned to the compressor 1051 along the refrigerant flow path, and is continuously circulated in the refrigeration cycle apparatus 1050.

The base 1030 supports the compressor 1051, the front cover 1011, the rear cover 1014, the side panels 1013a and 1013b, the filter bracket assembly 1070, the condenser 1052 and the fan 1033, . To support these components, the base 1030 preferably has a high rigidity.

The condenser 1052 and the fan 1033 can be installed on the rear side of the water purifier 1000. The circulation of the air is required for the heat dissipation of the condenser 1052. An air inlet 1034 may be formed at the bottom of the base 1030 for air circulation. The air sucked through the intake port 1034 is caused to flow by the fan 1033. The air flows toward the condenser 1052 to achieve air-cooled cooling. A duct structure 1032 surrounding the fan 1033 and the condenser 1052 may be fixed to the base 1030 to increase the heat radiation efficiency of the condenser 1052.

A drain 1035 is provided behind the duct structure 1032. The drain 1035 is exposed to the outside of the water purifier 1000 to form a drainage flow path. Since the internal flow path of the water purifier 1000 is all communicated, even if the drain 1035 is connected to only one internal flow path, all the fluid existing in the internal flow path can be discharged through the drain 1035.

The condenser 1052 may be provided at its upper portion with a pedestal 1031 for supporting the cold water tank assembly 1200. The pedestal 1031 has a first hole 1031a on the rear side and the rear cover 1014 has a second hole 1014a. The first hole 1031a and the second hole 1014a are formed at positions corresponding to each other. The first hole 1031a and the second hole 1014a are for disposing a drain valve for drainage of the cooling water filled in the cold water tank assembly 1200.

The cold water tank assembly 1200 is formed to receive cooling water therein. The cold water tank assembly 1200 is supplied with the purified water generated by the filter unit 1060. Particularly, in the case of the water purifier 1000 having no separate water tank, the cold water tank assembly 1200 can receive purified water directly from the filter unit 1060.

The temperature of the cooling water filled in the cold water tank assembly 1200 is lowered by the operation of the refrigeration cycle apparatus 1050. The cold water tank assembly 1200 is configured to cool the purified water to form cold water.

Since the cooling water is stored in the cold water tank assembly 1200 and does not circulate, the pollution degree of the cooling water increases after a long time. For hygiene, the cooling water stored in the cold water cooler assembly should be discharged to the outside periodically, and new cooling water should be filled in the cold water tank assembly 1200.

3 is a conceptual view showing the flow path configuration of the water purifier 1000 according to the present invention. The solid line in Fig. 3 represents the flow path of water. The water flow path may be divided into a raw water line 1400 on the upstream side of the filter unit 1060 and an integer line 1500 on the downstream side of the filter unit 1060 based on the filter unit 1060. Here, the upstream side or the downstream side is based on the flow of water.

The water supply valve 1312 is opened and closed based on a control command input through the input unit 1016 (see FIG. 1). The water supply valve 1312 is opened and the raw water is supplied from the raw water supply unit 10 to the filter unit 1060. In this case,

The raw water passes through the pressure reducing valve 1311 in the process of being supplied to the filter unit 1060. The pressure reducing valve 1311 is provided between the raw water supply part 10 and the filter part 1060. The pressure reducing valve 1311 is configured to reduce the pressure of the raw water supplied from the raw water supply unit 10.

Since the water purifier 1000 does not have a water reservoir, the pressure of the purified water exiting through the water outlet 1020 is determined by the pressure of the raw water supplied from the water supplier 10. Generally, since the pressure of the raw water supplied from the raw water supply unit 10 is high, if the pressure reducing valve 1311 is not provided, the outflow unit 1020 releases water to an excessively high pressure. There is also a risk that the unit filters 1061 and 1062 of the filter unit 1060 are physically damaged by the pressure of the raw water. Therefore, decompression of the raw water is required.

The pressure reducing valve 1311 reduces the pressure of the raw water supplied from the raw water supply unit 10 to the filter unit 1060. Accordingly, the filter unit 1060 can be protected, and the water outflow can be performed in the water outflow unit 1020 at an appropriate pressure.

The raw water is filtered while sequentially passing through the unit filters 1061 and 1062 of the filter unit 1060. On the basis of the filter unit 1060, the water on the upstream side is referred to as raw water and the water on the downstream side can be named as an integer.

The purified water generated by the filter unit 1060 sequentially passes through the water supply valve 1312 and the flow rate sensor 1313. The flow rate sensor 1313 is configured to measure the flow rate supplied from the filter unit 1060. The flow rate measured by the flow rate sensor 1313 is used to control the water purifier.

For example, when a control command for leaving a predetermined number of integers is inputted through the input unit 1060 of the water purifier 1000, a pulse value corresponding to a predetermined amount is input to the flow rate sensor 1313 by the control module 1080, The water supply valve 1312 is opened under the control of the module 1080. The control module 1080 receives the feedback from the flow rate sensor 1313 to control the water supply valve 1312 and controls the water supply valve 1312 to supply water to the water supply valve 1312. [ Is closed under the control of the control module 1080. The flow rate measured by the flow sensor 1313 through such a process can be used to control the water purifier 1000.

The purified water line 1500 connected to the flow sensor 1313 is branched into two branches 1600 and 1700 and sequentially connected to the flow control valve 1351 and the induction heating module 1100. This branch, which is sequentially connected to the flow control valve 1351 and the induction heating module 1100, can be named as a hot water line 1700. The other branch 1600 is provided with a check valve 1321 which branches off to the purified water line 1601 and the cold water line 1602 on the downstream side of the check valve 1321. A purified water outlet valve 1330 is installed in the purified water line 1601 and a cold water outlet valve 1340 is installed in the cold water line 1602. The purified water line 1601 and the purified water line 1602 are joined together to be connected to the water outlet 1020 and a check valve 1322 is installed in the combined flow channel 1603.

The two check valves 1321 and 1322 provided on the upstream side and the downstream side of the water outlet valve 1330 and the cold water outlet valve 1340 are connected to the first check valve 1321 and the second check valve 1322, . ≪ / RTI > The first check valve 1321 and the second check valve 1322 are for preventing the generation of residual water.

When a control command for supplying hot water is input to the water purifier, the water supply valve 1312, the flow control valve 1351 and the hot water outlet valve 1353 are opened, and hot water is discharged through the hot water line 1700. In this process, the pressure inside the purified water line 1601 and the cold water line 1602 may be lowered, and the water outflow valve 1330 or the cold water outlet valve 1340 may be instantaneously opened and then closed. There is no problem of residual water in the structure in which the water outlet 1020 has only one take-out cock and both cold water and hot water are taken out through the take-out cock. However, in a structure in which both cold water and hot water are discharged through two different take-out corks, a small amount of residual water may be discharged from the other take-out cock while hot water is discharged from any one take-out coke.

However, if the first check valve 1321 is provided on the upstream side of the bifurcation point between the purified water line 1500 and the cold water line 1602, 1601 and the cold water line 1602, respectively. Accordingly, it is possible to prevent the phenomenon that the water outlet valve 1330 or the cold water outlet valve 1340 is momentarily opened and closed.

When the configuration in which the cold water outlet valve 1340 is provided on the upstream side of the cold water tank assembly 1200 and the configuration in which the cold water outlet valve 1340 is provided on the downstream side of the cold water tank assembly 1200 are compared with each other, You can get a little more cold water. This is because an amount of cold water corresponding to the flow path length between the cold water tank assembly 1200 and the cold water outlet valve 1340 can be further supplied. Therefore, it is preferable that the cold water outlet valve 1340 is installed on the upstream side of the cold water tank assembly 1200 as shown in the figure. However, in the structure in which the cold water outflow valve 1340 is installed on the upstream side of the cold water tank assembly 1200, the cold water line 1602 may be left in the cold water line 1602 due to the pressure change in the cold water line 1602, Can be discharged through the water outlet 1020.

However, when the second check valve 1322 is installed in the confluent flow passage 1603 of the purified water line 1602, the pressure change of the cold water line 1602 can be prevented from being transmitted to the water outlet portion 1020 . Accordingly, it is possible to prevent a phenomenon that a small amount of residual water is discharged through the water outlet 1020 when the outflow is stopped.

The constant that has passed through the flow rate sensor 1313 may be supplied to the user at a normal temperature immediately or may be supplied to the user after it becomes hot water or cold water.

The water outlet valve 1330 and the cold water outlet valve 1340 are opened and closed based on a control command input through the input unit 1016, respectively. When a control command for leaving an integer is input through the input unit 1016, the water supply valve 1312 and the water outlet valve 1330 are opened. The constants generated by the filter unit 1060 are sent to the water outlet 1020 through the integer line 1601. Similarly, when a control command for leaving cold water is input through the input unit 1016, the water supply valve 1312 and the cold water outlet valve 1340 are opened. The purified water generated in the filter unit 1060 flows into the cold water tank assembly 1200 along the cold water line 1602 and is cooled while passing through the cold water tank assembly 1200. The cold water generated in the cold water tank assembly (1200) flows out through the water outlet (1020).

The cold water tank assembly 1200 is provided with a drain valve 1280 and the cooling water filled in the cold water tank assembly 1200 can be discharged to the outside through the drain valve 1280.

The hot water line 1700 is provided with a flow rate control valve 1351. If a flow rate of more than the proper amount flows into the hot water tank 1130 (see FIG. 4), sufficient heating may not be performed, so that the flow rate should always be adjusted so that only a proper amount of flow is introduced. The flow control valve 1351 is provided on the upstream side of the induction heating module 1100 to regulate the flow rate of the purified water flowing into the hot water tank 1130.

The flow rate control valve 1351 may be provided with a thermistor 1352. The temperature of the constant measured by the thermistor 1352 is used to control the induction heating module 1100. For example, if the temperature of the purified water measured by the thermistor 1352 is relatively low, the induction heating module 1100 can be operated at a high output. Conversely, if the temperature of the purified water measured by the thermistor 1352 is relatively high, the induction heating module 1100 can be operated at low output.

The hot water outlet valve 1353 is installed on the downstream side of the hot water tank 1130. When the control command for leaving the hot water is input through the input unit 1016, the water supply valve 1312 and the hot water outlet valve 1353 are opened, and hot water flows out along the hot water line 1700.

A safety valve 1360 may be installed in the flow channel branched from the hot water line 1700. The safety valve 1360 is configured to operate by a pressure change formed in the passage of water to pressure. When the flow path of the water purifier 1000 is overpressed, for example, when the induction heating module 1100 operates abnormally, the safety valve 1360 is opened and the purified water is drained through the drain 1035.

4 is an exploded perspective view of an induction heating module 1100 and a control module 1080 associated with the present invention.

The induction heating module 1100 refers to a set of components that generate hot water by receiving an integer generated from the filter unit 1060 (see FIG. 2). In particular, in the case of a direct water type water purifier 1000 (see FIGS. 1 to 3) which does not have a separate water tank, the purified water is supplied from the filter unit 1060 (see FIG. 2) directly to the induction heating module 1100 .

The induction heating module 1100 includes an induction heating printed circuit board 1110, induction heating printed circuit board covers 1121 and 1122, a hot water tank 1130, a working coil 1140, a bracket 1060 and a shield plate 1190, .

The induction heating printed circuit board 1110 controls the induction heating operation of the working coil 1140. Both ends of the working coil 1140 are connected to the induction heating printed circuit board 1110 and controlled by the induction heating printed circuit board 1110. For example, when the user inputs a control command through the input unit 1016 of the water purifier 1000 (see FIGS. 1 and 2) to extract hot water, the purified water generated in the filter unit 1060 (see FIG. 2) (1130). The induction heating printed circuit board 1110 controls the current to flow to the working coil 1140. The hot water tank 1130 is heated by induction heating by the current supplied to the working coil 1140. The purified water is instantaneously heated while passing through the hot water tank 1130 to become hot water.

The induction heating printed circuit board covers 1121 and 1122 are formed so as to surround the induction heating printed circuit board 1110. The induction heating printed circuit board covers 1121 and 1122 include a first induction heating cover 1121 and a second induction heating cover 1122.

An induction heating printed circuit board 1110 is installed in an inner space formed by the first induction heating cover 1121 and the second induction heating cover 1122. [ The first induction heating cover 1121 and the second induction heating cover 1122 are bonded to each other to prevent water from penetrating. In addition, a sealing member (not shown) may be coupled to the edges of the first induction heating cover 1121 and the second induction heating cover 1122 to prevent the penetration of water. The first induction heating cover 1121 and the second induction heating cover 1122 are preferably made of a flame retardant material to prevent the induction heating printed circuit board 1110 from being damaged by fire.

The hot water tank 1130 heats the purified water to generate hot water. The hot water tank 1130 has an inner space for heating the liquid. The hot water tank 1130 is subjected to induction heating under the influence of a magnetic force line formed by the working coil 1140. The liquid is heated while passing through the inner space of the hot water tank 1130 to become hot water. The hot water tank 1130 is configured to maintain airtightness.

In order to miniaturize the water supply device such as the water purifier 1000 (see FIG. 1) or the refrigerator, it is necessary to downsize the hot water tank 1130. The thickness of the hot water tank 1130 as well as the length and width of the hot water tank 1130 must be reduced as compared with the prior art, thereby realizing miniaturization of the water supply device. Therefore, as the hot water tank 1130 is formed flat, it is easy to realize the miniaturization of the water supply device. However, as shown in FIG. 4, the hot water tank 1130, which is generally flat, causes some problems.

The first problem is the deformation of the hot water tank 1130. When the liquid is heated in the internal space of the hot water tank 1130, the liquid expands. The pressure of the internal space rapidly increases as the liquid expands. A sudden increase in pressure causes deformation of the hot water tank 1130.

The second problem is insufficient heating. If the liquid is heated by using the very large hot water tank 1130, the liquid can be sufficiently heated since there is enough time to heat the liquid. However, the miniaturized hot water tank 1130 does not have enough time to heat the liquid, so that the liquid may not be sufficiently heated.

The above two problems are not necessarily caused by the miniaturization of the hot water tank 1130. However, the smaller the hot water tank 1130 is, the greater the seriousness of the problem becomes. The hot water tank 1130 of the present invention has a structure that can solve such a problem. The detailed structure of the hot water tank 1130 will be described later with reference to Fig.

The working coil 1140 forms a magnetic force line for induction heating of the hot water tank 1130. The working coil 1140 is disposed on one side of the hot water tank 1130 so as to face the hot water tank 1130. When a current is supplied to the working coil 1140, a magnetic force line is formed in the working coil 1140. This line of magnetic force affects the hot water tank 1130, and the hot water tank 1130 is subjected to induction heating under the influence of a magnetic line of force.

The shield plate 1190 is disposed on one side of the working coil 1140. The shield plate 1190 is disposed on the opposite side of the hot water tank 1130 with respect to the working coil 1140. The shield plate 1190 prevents the magnetic force lines generated from the working coil 1140 from being radiated to other regions except for the hot water tank 1130. The shield plate 1190 may be made of aluminum or other material that changes the flow of magnetic force lines.

The control module 1080 includes a control printed circuit board 1082, a noise printed circuit board 1083, a near field communication (NFC) printed circuit board 1084, a buzzer 1085, a main printed circuit board 1086, And a main printed circuit board cover 1087, 1088.

The control printed circuit board 1082 is a sub-configuration of a display printed circuit board (not shown). The control printed circuit board 1082 is not an essential configuration for driving a water supply device such as the water purifier 1000 (see FIG. 1), but plays a role of a display printed circuit board (not shown).

The noise printed circuit board 1083 is for supplying power to the induction heating printed circuit board 1110. Since the output voltage for induction heating is very high, sufficient power must be supplied. The noise printed circuit board 1083 is also not an essential configuration for driving a water supply device such as the water purifier 1000 (see Fig. 1). However, a water supply device such as the water purifier 1000 (see Fig. 1) may have a noise printed circuit board 1083 in case that the power required for induction heating is not sufficiently supplied. The noise printed circuit board 1083 can supply an additional power to the induction heating printed circuit board 1110 to satisfy the output voltage for induction heating. The noise printed circuit board 1083 can serve as an auxiliary power source for the other components as well as the induction heating printed circuit board 1110.

The buzzer 1085 outputs sound so as to provide the user with accurate failure information when a failure occurs in the water supply device such as the water purifier 1000 (see FIG. 1). The buzzer 1085 can output a specific sound of the code pre-inputted according to the failure.

The NFC printed circuit board 1084 is for exchanging data with a communication device. Currently, personal communication devices such as smart phones are becoming popular. Therefore, if the consumer can check the state of the water purifier or input the control command by using the personal communication device, the convenience of the consumer can be improved. The NFC printed circuit board 1084 provides status information of the water supply device to the paired personal communication device and receives control commands of the user from the personal communication device.

The main printed circuit board 1086 controls the overall operation of the water supply device, such as the water purifier 1000 (see FIG. 1). The drive of the compressor 1051 (see Fig. 2) described in Fig. 1 and the input / output unit 1016 (Fig. 1) described in Fig. 2 can also be controlled by the main printed circuit board 1086. Fig. The main printed circuit board 1086 may be supplied with insufficient power through the noise printed circuit board 1083 when power is insufficient.

The main printed circuit board covers 1087 and 1088 are configured to enclose the main printed circuit board 1086. The main printed circuit board covers 1087 and 1088 include a first main cover 1087 and a second main cover 1088.

A main printed circuit board 1086 is installed in an inner space formed by the first main cover 1087 and the second main cover 1088. [

The first main cover 1087 and the second main cover 1088 are engaged with each other to prevent water from penetrating. A sealing member (not shown) may be installed on the first main cover 1087 and the second main cover 1088 to prevent the penetration of water. The first main cover 1087 and the second main cover 1088 are preferably made of a flame retardant material to prevent the main printed circuit board 1086 from being damaged by fire.

Hereinafter, the structure of the hot water tank 1130 that implements deformation prevention and flow distribution (or flow rate control) will be described. A structure capable of maintaining a constant gap between the working coil 1140 and the hot water tank 1130 will be described.

Fig. 5 is an exploded perspective view showing some components of the induction heating module 1100 (see Fig. 4) related to the present invention. Fig.

The hot water tank 1130 is formed by joining the rims of the first cover 1131 and the second cover 1132 together. The rim of the first cover 1131 and the rim of the second cover 1132 may be joined to each other by welding or the like so as to maintain airtightness. The hot water tank 1130 has an inner space for heating the liquid. The inner space is formed by the engagement of the first cover 1131 and the second cover 1132.

The hot water tank 1130 includes a water inlet pipe 1132a and a water outlet pipe 1132b. The water inlet pipe 1132a and the water outlet pipe 1132b may be formed in the second cover 1132. And corresponds to a flow path through which the liquid to be heated flows into the water inlet pipe 1132a. The water outlet pipe 1132b corresponds to a flow path through which the heated liquid is discharged. The water inlet pipe 1132a and the water outlet pipe 1132b may be formed on opposite sides.

The first cover 1131 is made to generate heat under the influence of a magnetic force line formed by the working coil 1140. The first cover 1131 is heated by the working coil 1140 so that the gap between the first cover 1131 and the working coil 1140 is kept constant so that the output of the first cover 1131 can be accurately controlled. . Accurate control of induction heating means controlling the output of the induction heating module 1110.

If the working coil 1140 deviates from the reference position, it is difficult to precisely control the induction heating of the first cover 1131. Here, the reference position refers to the position of the working coil 1140 where the induction heating of the first cover 1131 by the working coil 1140 can be accurately controlled. The spacing between the first cover 1131 and the working coil 1140 is maintained by the spacers 1151 and 1152 described later.

Similarly, if one portion of the first cover 1131 is too far away from the working coil 1140 or too close to the working coil 1140 as compared to the other portion, the induction heating of the one portion is difficult to control accurately. Therefore, it is preferable that the first cover 1131 has a flat plate shape so that all the portions of the first cover 1131 are uniformly positioned at an appropriate distance from the working coil 1140.

The first cover 1131 may be made of a suitable material for heat generation. The first cover 1131 may be made of a stainless steel material, and preferably a stainless steel material of a four-type. More preferably, the first cover 1131 may be made of STS (STS) 439 material. STS 439 has enhanced corrosion resistance compared to STS430. Corrosion resistance refers to a property capable of inhibiting corrosion by contact with water. The first cover 1131 may have a thickness of about 0.8 mm or less.

The second cover 1132 is disposed on the opposite side of the working coil 1140 with respect to the first cover 1131 and the influence of the magnetic force lines is small so that the second cover 1132 is less related to the heat generation than the first cover 1131. Therefore, it is preferable that the second cover 1132 is made of a material having corrosion resistance more than a heat generating characteristic. The second cover 1132 may be made of stainless steel material, preferably three stainless steel materials. More preferably, the second cover 1132 may be made of STS 304 material. STS 304 has more enhanced corrosion resistance than STS 430 or STS 439. The second cover 1132 may have a thickness of about 1.0 mm or less.

Since the second cover 1132 is less relevant to induction heating, it is not necessarily required to maintain a certain distance from the working coil 1140. Thus, a portion of the second cover 1132 may be remote from the working coil 1140 relative to other portions or may be disposed closer to the working coil.

The second cover 1132 includes a base surface 1132c, a protruding surface 1132d, a welded portion 1132e, and a protruding portion 1132f. The base surface 1132c, the protruding surface 1132d, and the protruding portion 1132f may be integrally formed by press working. When the second cover 1132 having the base surface 1132c is partially pressed, the protruding surface 1132d and the protruding portion 1132f may be formed in the second cover 1132. [ The protruding surface 1132d and the protruding portion 1132f may be formed of any one of the second cover 1132 and the second cover 1132. In this case, Should be understood to be named to distinguish parts from others. The base surface 1132c, the protruding surface 1132d, and the protruding portion 1132f denote the respective portions of the second cover 1132. [

The base surface 1132c faces the first cover 1131 at a position spaced apart from the first cover 1131. [ It has been described above that the hot water tank 1130 has an internal space for heating the liquid. The base surface 1132c is spaced from the first cover 1131 to form the interior space.

The protruding surface 1132d protrudes from the base surface 1132c toward the first cover 1131. [ The protruding surface 1132d may be in close contact with the first cover 1131. [ The periphery of the projecting surface 1132d connects the base surface 1132c and the projecting surface 1132d to each other. When the second cover 1132 is pressed to form the protruding surface 1132d, the circumferences that naturally connect the base surface 1132c and the protruding surface 1132d are formed. The periphery of the projecting surface 1132d may be formed to be inclined.

The welded portion 1131e is formed by welding of the first cover 1131 and the second cover 1132. [ More specifically, the welded portion 1131e is formed by welding the first cover 1131 and the projecting surface 1132d. Therefore, the welded portion 1131e is formed not only on the projecting surface 1132d but also on the first cover 1131. [

The base surface 1132c can not be welded to the first cover 1131 since it is spaced from the first cover 1131 to form the internal space of the hot water tank 1130. [ The periphery of the projecting surface 1132d is further away from the first cover 1131 as it gets closer to the base surface 1132c and thus is hard to be welded to the first cover 1131. [ On the other hand, since the protruding surface 1132d is protruded so as to be in close contact with the first cover 1131, it can be easily welded to the first cover 1131. The protruding surface 1132d itself is a configuration that is premised to form the welded portion 1131e rather than having a technical meaning.

The welded portion 1131e serves to prevent deformation of the first cover 1131. When the temperature of the liquid in the hot water tank 1130 is raised by the operation of the induction heating module 1100 (see FIG. 3), the liquid gradually expands and the pressure inside the hot water tank 1130 gradually increases. The pressure inside the hot water tank 1130 can rise very high during the hot water generation process because it is known that when the water evaporates and becomes vapor, its volume becomes about 1,700 times larger. The internal pressure of the hot water tank 1130, which is rapidly increased, may cause deformation of the first cover 1131.

The first cover 1131 is required to have a flat plate shape for precise control of induction heating, and the flat plate is limited to having a deformation preventing structure due to a pressure rise. A weld portion 1131e is introduced to prevent deformation of the first cover 1131 within such a limit.

Welding refers to an operation of locally applying heat at a desired position to melt a part of a metal material and rearrange the atomic bonds to bond the two metal materials together. Welded joints have very strong bonding force due to rearrangement of atomic bonds. The first cover 1131 can be described as having the welded portion 1131e and the second cover 1132 can be described as having the welded portion 1131e formed by the welding of the protruding surface 1132d and the first cover 1131. [ May be described as having a weld 1132e and the first cover 1131 and the second cover 1132 may be described as having a weld 1131e. Further, the welded portion 1131e may be described as being formed between the first cover 1131 and the second cover 1132. Although the welded portion (not shown) of the second cover 1132 is not shown in FIG. 5, the shape and position of the welded portion 1131e of the first cover 1131 can be inferred.

The welded portion 1131e strongly bonds the first cover 1131 and the second cover 1132 so that deformation of the first cover 1131 can be prevented even if the internal pressure of the hot water tank 1130 rises. It is further understood that the welding portion 1131e can prevent deformation of not only the first cover 1131 but also the second cover 1132 in that the first cover 1131 and the second cover 1132 are coupled to each other have.

The position of the welded portion 1132e is not limited to a specific position. The welding portion 1132e is preferably formed at a position not overlapping with the temperature sensor 1181, but it is not necessarily formed. The overlapped position means that the welded portion 1132e and the temperature sensor 1181 are projected in the same area when the working coil assembly 1140 is viewed from the front in the second cover 1132. [

The temperature sensor 1181 is disposed on the opposite side of the second cover 1132 with respect to the first cover 1131. The temperature sensor 1181 is configured to measure the temperature of the liquid passing through the internal space of the hot water tank 1130. In order for the temperature sensor 1181 to measure the temperature of the liquid, a liquid must exist at a position overlapping with the temperature sensor 1181. [ However, if the welding portion 1131e is formed at a position overlapping with the temperature sensor 1181, there is no liquid at a position overlapping with the temperature sensor 1181, and only the welding portion 1131e exists. Therefore, in this structure, the measurement of the hot water temperature by the temperature sensor 1181 may be inaccurate.

The welded portion 1131e has the shape of a closed curve. If the welded portion 1131e is formed in a shape having an end point such as a straight line or a curved line, the influence of the high pressure formed in the hot water tank 1130 is concentrated on the end point. Thereby separating the first cover 1131 and the second cover 1132 from the end point. On the contrary, if the welding portion 1132e has a closed curve shape, the influence of the high pressure force can be distributed evenly to the closed curve without concentrating on one portion. Therefore, the welded portion 1131e of the closed curve can improve the withstand pressure performance of the hot water tank 1130.

A closed curve in this specification refers to a figure with the same start point and end point when a point on a straight line or a curve is taken. For example, not only the circle, the ellipse but also the polygon correspond to the closed curve, so that the closed curve must not necessarily be formed only in a curved line, but may be formed by a set of straight lines. Therefore, instead of the name of closed curve, the name closed form or single closed curve may be used.

The protrusion 1132f protrudes from the base surface 1132c toward the first cover 1131. [ The protruding portion 1132f is not in close contact with the first cover 1131 but is spaced apart from the first cover 1131 as opposed to the protruding surface 1132d being in close contact with the first cover 1131. [ However, the protrusion 1132f is formed closer to the first cover 1131 than the base surface 1132c.

The protrusion 1132f extends toward the water inlet pipe 1132a and the water outlet pipe 1132b of the hot water tank 1130. [ The protruding portion 1132f is also connected to the water inlet pipe 1132a and the water outlet pipe 1132b when the water inlet pipe 1132a and the water outlet pipe 1132b are disposed on opposite sides of the water tank 1130 with respect to the upper and lower directions, In the vertical direction. The protrusion 1132f can reinforce the rigidity (or strength) of the second cover 1132 through the structure protruding toward the first cover 1131 and extending toward the water inlet pipe 1132a and the water outlet pipe 1132b .

The protrusion 1132f is for preventing deformation of the second cover 1132 and for distributing the flow rate of the liquid (or controlling the flow rate of the liquid). As described above, when the internal pressure of the hot water tank 1130 rises, not only the first cover 1131 but also the second cover 1132 may be deformed. The protrusion 1132f reinforces the rigidity of the second cover 1132 through the protruding structure so that the protrusion 1132f can prevent the second cover 1132 from coming off even if the internal pressure of the hot water tank 1130 rises. Can be prevented. The second cover 1132 is strongly coupled to the first cover 1131 by the welded portion 1132e so that the deformation of the second cover 1132 due to the interaction between the welded portion 1132e and the protruded portion 1132f Can be prevented.

The protruding portion 1132f has a constant width in a direction intersecting the extending direction. For example, the extending direction of the protrusion 1132f is the up-and-down direction toward the water inlet pipe 1132a and the water outlet pipe 1132b. The direction intersecting the extending direction is the left-right direction. Since the protrusion 1132f has a certain width in the left and right direction, the liquid particles flowing through the water inlet pipe 1132a collide with the protrusion 1132f. And the particles of the collided liquid spread out in all directions. Through such a mechanism, the protruding portion 1132f can distribute the flow amount to various places inside the hot water tank 1130. [

Further, the protrusion 1132f controls the flow velocity. For example, the protrusion 1132f forms a flow resistance to lower the flow rate of the liquid. The particles of the liquid flowing into the hot water tank 1130 through the water inlet pipe 1132a are resisted by the flow as they collide with the protrusion 1132f. Therefore, when the liquid particles collide with the protrusion 1132f, the flow velocity of the liquid drops. This is to prevent the liquid from being heated too fast and not being sufficiently heated in the hot water tank 1130. The protrusion 1132f controls the flow rate so that the liquid can stay in the hot water tank 1130 sufficiently. So that the liquid can be sufficiently heated in the hot water tank 1130.

The protrusion 1132f includes a first protrusion 1132f1 and a second protrusion 1132f2.

The first protrusion 1132f1 extends toward the water inlet pipe 1132a and the water outlet pipe 1132b of the hot water tank assembly 1130. [ The first protrusion 1132f1 is provided to prevent the second cover 1132 from being deformed. The first protrusion 1132f1 may have a smaller width than the second protrusion 1132f2.

The second protrusion 1132f2 extends in a direction intersecting the extending direction of the first protrusion 1132f1. For example, the first protrusion 1132f1 extends in the vertical direction, and the second protrusion 1132f2 extends in the left-right direction intersecting the up-down direction.

The length of the second projection 1132f2 in the left-right direction is longer than the width of the first projection 1132f1. This is because the second protrusion 1132f2 is a configuration for controlling the flow rate and the distribution of the flow rate of the second cover 1132. [ In order to disperse the liquid to be heated in the hot water tank 1130, the second protrusion 1132f2 must be able to collide with the liquid particles. The extended length of the second protrusion 1132f2 is formed to be longer than the width of the first protrusion 1132f1 to provide a collision area with the liquid particles. The second protrusion 1132f2 may protrude closer to the first cover 2131 relative to the first protrusion 1132f1 for providing a collision area.

The second protrusion 1132f2 may be formed at both ends of the first protrusion 1132f1. 5, the first end and the second end of the first protrusion 1132f1 are disposed close to the water inlet pipe 1132a and the water outlet pipe 1132b, respectively. do. The second protrusion 1132f2 may be formed at the first end and the second end of the first protrusion 1132f1, respectively, and may be formed between the first end and the second end.

The hot water tank 1130 may have a plurality of first protrusions 1132f1 and second protrusions 1132f2. At least a portion of the plurality of second protrusions 1132f2 is arranged to be in contact with the liquid introduced through the water inlet pipe 1132a or the liquid to be discharged through the water outlet pipe 1132b. Contact with liquid means collision with liquid particles. Through the structure of the second protrusion 1132f2, flow rate distribution and flow rate control can be performed.

Those formed at the first end (the end on the side of the water inlet pipe 1132a) of the first protrusion 1132f1 of the plurality of second protrusions 1132f2 are for the control of the flow rate distribution and the flow rate. The liquid particles flowing into the hot water tank 1130 through the water inlet pipe 1132a collide with the second protrusion 1132f2 and the flow rate of the liquid spreads in all directions. So that the liquid can be sufficiently heated in the hot water tank 1130. [

Those formed at the second end (end of the water pipe 1132b) of the first protrusion 1132f1 of the plurality of second protrusions 1132f2 are for controlling the flow rate. When the liquid is mixed with each other before the liquid is discharged from the hot water tank 1130 by controlling the flow rate, hot water in a uniform temperature range can be provided.

The first protrusion 1132f1 and the second protrusion 1132f2 can be integrally formed by press working. When the second cover 1132 having the base surface 1132c is pressed in consideration of the extending direction of the first protrusion 1132f1 and the extending direction of the second protrusion 1132f2, the first protrusion 1132f1 and the second protrusion 1132f2, The base plate 1132f2 is integrally formed with the base surface 1132c. Since the protruding surface 1132d can also be formed by press working, the protruding portion 1132f and the protruding surface 1132d can be formed simultaneously by a single press working.

The position and number of the first protrusion 1132f1, the second protrusion 1132f2, and the weld 1132e can be selectively changed. The position of the protruding portion 1132f is not particularly limited. The protrusion 1132f may be formed at a position overlapping with the temperature sensor 1181. [

The working coil 1140 is disposed on one side of the hot water tank 1130. The working coil 1140 and the hot water tank 1130 are arranged to face each other at a spaced apart position. Referring to FIG. 5, the working coil 1140 can be described as being disposed at a position facing the outer surface of the first cover 1131. For convenience of explanation, the surface of the first cover 1131 facing the second cover 1132 is divided into an inner surface and the surface facing the working coil 1140 is divided into outer surfaces. Therefore, one side of the hot water tank 1130 corresponds to a position facing the outer surface of the first cover 1131.

The working coil 1140 is formed by a wire wound in an annular shape. The working coil 1140 is comprised of a single strand or strands of copper or other conductors. When the working coil 1140 is formed of a plurality of strands, each strand is insulated.

The working coil 1140 forms a magnetic field or a magnetic field line by the current applied to the working coil 1140. The first cover 1131 generates heat by being affected by a magnetic force line formed by the working coil 1140.

Since the hot water tank 1130 is heated by the working coil 1140, the constant spacing between the working coil 1140 and the hot water tank 130 is very important for the control of induction heating. The spacers 1151 and 1152 are disposed between the working coil 1140 and the hot water tank 1130 so as to maintain a constant gap between the working coil 1140 and the hot water tank 1130.

Spacers 1151 and 1152 must satisfy the following six conditions.

The first condition is that even if the spacers 1151 and 1152 are squeezed by the hot water tank 1130 and the working coil 1140 the spacers 1151 and 1152 are spaced apart from the working coil 1140 and the hot water tank 1130 To be maintained. In order to precisely control the induction heating, the gap between the hot water tank 1130 and the working coil 1140 must be kept constant. One surface of each of the spacers 1151 and 1152 is brought into close contact with the hot water tank 1130 while the spacers 1151 and 1152 are disposed between the hot water tank 1130 and the working coil 1140, The gap between the hot water tank 1130 and the working coil 1140 is determined by the thickness of the spacers 1151 and 1152. [

If the spacers 1151 and 1152 are compressed and resiliently deformed by the hot water tank 1130 and the working coil 1140, the thickness of the spacers 1151 and 1152 will be thinner than before being compressed, and the hot water tank 1130, The distance between the coils 1140 can not be kept constant. Therefore, the spacers 1151 and 1152 must be able to maintain their original thickness without being deformed even when they are pressed by the hot water tank 1130 and the working coil 1140.

If the spacers 1151 and 1152 have appropriate strength, even if they are pressed by the hot water tank 1130 and the working coil 1140, the original thickness can be maintained without generating elastic deformation. Therefore, the first condition of the spacers 1151 and 1152 means that the hot water tank 1130 and the working coil 1140 must have a strength that does not cause deformation even when they are crushed.

The second condition is that the spacers 1151 and 1152 must be able to maintain electrical insulation between the hot water tank 1130 and the working coil 1140. A current is applied to the working coil 1140 for induction heating. However, when the current applied to the working coil 1140 is conducted to the hot water tank 1130, the induction heating of the hot water tank 1130 is affected. This is because induction heating is heating using joule heating generated by the electrical resistance of the metal.

If the electrical insulation between the hot water tank 1130 and the working coil 1140 is not maintained, it is difficult to accurately control the induction heating of the hot water tank 1130. Since the spacers 1151 and 1152 are disposed between the hot water tank 1130 and the working coil 1140, the spacers 1151 and 1152 must be made of an electrical insulator.

The third condition is that the spacers 1151 and 1152 should be able to suppress the heat transfer between the hot water tank 1130 and the working coil 1140. When a current flows in the working coil 1140, the working coil 1140 generates heat and the hot water tank 1130, which is inductively heated by the working coil 1140, also generates heat. Therefore, there is a risk of fire due to overheating by the two heating elements .

Also, the induction heating module 1100 (see FIG. 4) is controlled based on the temperature measured at the temperature sensor 1181. Since the precise control of the induction heating module becomes more difficult when the temperature sensor 1181 is affected by too many elements, the influence of the induction heating module 1100 on the temperature sensor 1181 is as small as possible desirable.

However, if the heat transfer between the hot water tank 1130 and the working coil 1140 is not suppressed, factors affecting the temperature measured by the temperature sensor 1181 are increased, which makes it difficult to accurately control the induction heating module 1100 I make it. Since the spacers 1151 and 1152 are disposed between the hot water tank 1130 and the working coil 1140 so that the spacers 1151 and 1152 can suppress the heat conduction between the hot water tank 1130 and the working coil 1140,

The fourth condition is that the spacers 1151 and 1152 should be made of a flame retardant material having heat resistance. The spacers 1151 and 1152 are disposed between the working coil 1140 and the hot water tank 1130 and the temperatures of the working coil 1140 and the hot water tank 1130 rise to about 150 ° C., Can not be damaged by heat unless they have heat resistance.

Therefore, the spacers 1151 and 1152 must be made of a flame retardant material having heat resistance of at least 200 to 300 ° C so as not to be damaged even at a temperature higher than the temperature of the heated working coil 1140 and the induction- heated hot water tank 1130.

The spacers 1151 and 1152 may be formed of any one of mica, quartz, and glass to satisfy the first to fourth conditions. Mica, quartz, and glass are flame retardants that can maintain their thickness even when pressed by the hot water tank 1130 and the working coil 1140, have electrical insulation, suppress heat conduction, and have sufficient heat resistance.

Also, the spacers 1151 and 1152 may be formed of silicon (Si) to satisfy the second to fourth conditions. Silicon is a flame retardant that has electrical insulation, can suppress thermal conduction, and has sufficient heat resistance. However, silicon may cause elastic deformation when it is excessively squeezed by the hot water tank 1130 and the working coil 1140. Therefore, silicon can be used as a material for the spacers 1151 and 1152 only when it is not excessively squeezed by the hot water tank 1130 and the working coil 1140.

The fifth condition of the spacers 1151 and 1152 is that the spacers 1151 and 1152 must have a structure capable of passing both ends of the working coil 1140. The working coil 1140 is formed by a wire in an annular shape and one end of the working coil 1140 is extended from the inside of the annular shape to be connected to the induction heating printed circuit board 1110 And the other end extends outside the annular shape and is connected to the induction heating printed circuit board.

The spacers 1151 and 1152 are formed in an annular shape corresponding to the working coil 1140 so that the first portions 1151a and 1152a and the second portion Load 1152b. The first portions 1151a and 1152a form any part of the annular shape. The second portion 1152b forms the remainder of the annulus and has a narrower width than the first portions 1151a and 1152a. Particularly, the second portion 1152 is recessed inwardly and outwardly of the annular shape to have a narrower width than the first portions 1151a and 1152a. Accordingly, a gap is formed between the inside and the outside of the annular shape so that both ends of the working coil 1140 can pass through. One end of the working coil 1140 passes through the inside of the annular shape and the other end of the working coil 1140 passes outside the annular shape.

The sixth condition of the spacers 1151 and 1152 should be such that the spacers 1151 and 1152 can implement the cooling of the working coil 1140. Since the heat generated in the hot water tank 1130 by the induction heating is transferred to the liquid passing through the hot water tank 1130, the hot water tank 1130 is cooled by the liquid. The working coil 1140 is in close contact with the spacers 1151 and 1152 and the insulator 1153 to be described later and the spacers 1151 and 1152 and the insulator 1153 are configured to suppress heat transfer. There is no object to transfer heat except air.

Therefore, in order to cool the working coil 1140, it is necessary to provide an area where the working coil 1140 can sufficiently contact the air. The spacers 1151 and 1152 have holes 1151c and 1152c for opposing the hot water tank 1130 and the working coil 1140 to each other. The holes 1151c and 1152c may be formed in the first portions 1151a and 1152a and may be formed to be spaced from each other along the annular spacers 1151 and 1152.

The working coil 1140 and the hot water tank 1130 can be opposed to each other through the holes 1151c and 1152c since the working coil 1140 and the hot water tank 1130 are arranged to face each other at a spaced position. Since the working coil 1140 is spaced from the hot water tank 1130, the working coil 1140 can be in contact with air through the holes 1151c and 1152c. Therefore, the holes 1151c and 1152c form a contact area between the working coil 1140 and the air.

Referring again to FIG. 2, the water purifier 1000 includes a fan 1033, and the wind generated by the fan 1033 promotes the air flow inside the water purifier 1000. Therefore, when the wind generated by the fan 1033 is transmitted to the working coil 1140 through the holes 1151c and 1152c, the cooling of the working coil 1140 can be further accelerated as compared with the natural convection of air.

The plurality of spacers 1151 and 1152 may be provided. For example, if the gap between the hot water tank 1130 and the working coil 1140 should be kept constant at 3.5 mm, three spacers 1151 having a thickness of 1 mm and spacers 1152 having a thickness of 0.5 mm, One can be disposed between the hot water tank 1130 and the working coil 1140. The plurality of spacers 1151 and 1152 must be arranged so as to be in close contact with each other so that the distance between the hot water tank 1130 and the working coil 1140 is determined by the thickness of the spacers 1151 and 1152.

The insulator 1153 is disposed on the opposite side of the spacers 1151 and 1152 with respect to the working coil 1140. The insulator 1153 may be understood to be disposed between the working coil 1140 and a bracket 1160 described later. The insulator 1153, like the spacers 1151 and 1152, must satisfy the following five conditions. However, the condition that the spacing can be maintained like the spacers 1151 and 1152 does not apply to the insulator 1153.

The first condition is that the insulator 1153 must be able to maintain electrical insulation between the working coil 1140 and the core 1170. The core 1170 is intended to suppress current loss, and ferrite is generally used as the material of the core 1170. Therefore, when the current applied to the working coil 1140 is transmitted to the ferrite, which is a conductive material, normal operation of the core 1170 may be hindered. Therefore, the insulator 1153 must be made of a material capable of maintaining electrical insulation.

The second condition is that the insulator 1153 should be able to suppress the heat transfer between the working coil 1140 and the bracket 1160. The bracket 1160 can be formed by injection, and the injection is generally weak to heat. Accordingly, when the heat generated by the working coil 1140 is transmitted to the bracket 1160, the bracket 1160 may be damaged by heat. In order to prevent the bracket 1160 from being damaged by heat, the insulator 1153 should be made of a material capable of suppressing heat transfer.

The third condition is that the insulator 1153 must be made of a flame retardant material having heat resistance. The reason why the insulator 1153 should be made of a flame retardant material having heat resistance is the same as the reason why the spacers 1151 and 1152 should be made of a flame retardant material having heat resistance.

The insulator 1153 may be formed of any one of mica, quartz, glass, and silicon to satisfy the first to third conditions. Mica, quartz, glass and silicon are flame retardants that have electrical insulation, can suppress thermal conduction, and have sufficient heat resistance. In particular, since the insulator 1153 does not require a condition related to keeping the gap, silicon can be used as the material of the insulator 1153 without restriction.

The fourth condition of the insulator 1153 is that the insulator 1153 should have a structure capable of passing both ends of the working coil 1140. The structure in which the insulator 1153 can pass both ends of the working coil 1140 is the same as that in which the spacers 1151 and 1152 must have a structure capable of passing both ends of the working coil 1140. Thus, the insulator 1153 may have substantially the same structure as the spacers 1151 and 1152.

The insulator 1153 is formed in an annular shape corresponding to the working coil 1140 and includes a first portion 1153a and a second portion 1153b to allow both ends of the working coil 1140 to pass therethrough. The first portion 1153a forms a part of the annular shape. The second portion 1153b forms the remainder of the annulus and has a narrower width than the first portion 1153a. Particularly, the second portion 1153b is recessed on the inner side and the outer side of the annular shape to have a narrower width than the first portion 1153a. Accordingly, a gap is formed between the inside and the outside of the annular shape so that both ends of the working coil 1140 can pass through. One end of the working coil 1140 passes through the inside of the annular shape and the other end of the working coil 1140 passes outside the annular shape.

The fifth condition of the insulator 1153 should be a structure in which the insulator 1153 can realize cooling of the working coil 1140. The reason why the insulator 1153 should be structured so as to realize the cooling of the working coil 1140 is the same as the reason why the spacers 1151 and 1152 must be structured so as to realize cooling of the working coil 1140. Holes 1153c for air contact with the working coil 1140 are formed in the insulator 1153 in the same manner as the spacers 1151 and 1152. [

As described above, the spacers 1151 and 1152 and the insulator 1153 must satisfy substantially the same conditions except for the gap maintaining condition. Therefore, the spacers 1151 and 1152 and the insulator 1153 are made of the same material and can have the same structure. The names of the spacers 1151 and 1152 and the insulator 1153 are also intended to be distinguished from each other.

The bracket 1160 is formed to fix the hot water tank 1130 inside the purifier 1000 (see FIG. 1). Referring back to FIG. 4, bosses 1087a and 1087b (1162a and 1162b) are formed on the front surface of the main printed circuit board cover 1087 and the bracket 1160, respectively. The positions of the two bosses 1087a and 1087b (1162a and 1162b) can be changed according to the design, and it can be understood that the positions of the bosses are changed by comparing FIGS. When a screw (not shown) is inserted into the bosses 1087a and 1087b of the main printed circuit board cover 1087 through the bosses 1162a and 1162b of the bracket 1160, the bracket 1160 is inserted into the water purifier 1000, And is fixed inside the body. The bracket 1160 is coupled to the hot water tank 1130 so that the bracket 1160 can fix the hot water tank 1130 inside the purifier 1000.

Referring again to FIG. 5, the bracket 1160 and the hot water tank 1130 are coupled to each other with the spacers 1151 and 1152, the working coil 1140, and the insulator 1153 interposed therebetween. A plurality of bosses 1161a, 1161b, 1161c, and 1161d are formed on the bracket 1160 at positions corresponding to the rim of the hot water tank 1130. [ The plurality of bosses 1161a, 1161b, 1161c, and 1161d are disposed apart from each other along a line corresponding to the rim of the hot water tank 1130. [ The hot water tank 1130 and the bracket 1160 are coupled to each other by the screws 1800a, 1800b, 1800c, and 1800d inserted into the bosses 1161a, 1161b, 1161c, and 1161d.

The heads of the screws 1800a, 1800b, 1800c, and 1800d and the bosses 1161a, 1161b, and 1100d of the hot water tank 1130 and the bracket 1160 are coupled by the screws 1800a, 1800b, 1800c, 1161c, and 1161d, the rim of the hot water tank 1130 is disposed. With this structure, the hot water tank 1130 can be coupled to the bracket 1160 without having a separate hole for screw tightening.

When both the bracket 1160 and the hot water tank 1130 are coupled by the screws 1800a, 1800b, 1800c and 1800d, both surfaces of the spacers 1151 and 1152 are pressed by the hot water tank 1130 and the working coil 1140. Nevertheless the reason that the brackets 1160 and the hot water tank 1130 can be coupled by the screws 1800a, 1800b, 1800c and 1800d is that the spacers 1151 and 1152 are connected to the hot water tank 1130 and the working coil 1140, This is because the interval between the electrodes can be kept constant.

If the gap between the hot water tank 1130 and the working coil 1140 is narrowed in the course of the brackets 1160 and the hot water tank 1130 being joined by the screws 1800a, 1800b, 1800c, and 1800d, Can not be controlled. However, since the spacers 1151 and 1152 can keep the gap between the hot water tank 1130 and the working coil 1140 constant, the brackets 1160 and the hot water tank 1130 can be fixed to the screws 1800a, 1800b, 1800c, and 1800d ), And there is no problem in controlling the induction heating.

The bracket 1160 includes a base portion 1168. The two boss portions 1161a, 1161b, 1161c, and 1161d of the bracket described above are formed along the rim of the base portion 1168. [ A plurality of hot water tank supporting portions 1163 protrude from the base portion 1168 to support the hot water tank 1130. The hot water tank supporting portions 1163 may be formed to be spaced apart from each other along a line corresponding to the rim of the hot water tank 1130. The outside of the hot water tank 1130 is divided into the boss portions 1161a, 1161b, and 1161c by the screws 1800a, 1800b, 1800c, and 1800d, And 1161d, and the inner side is supported by the hot water tank supporting portion 1130. [

The bracket 1160 has a plurality of core accommodating portions 1164 arranged radially. The core accommodating portion 1164 is formed by being recessed in a direction away from the insulator 1153. A plurality of cores (1170) are inserted into respective core accommodating portions (1164).

The core 1170 serves to suppress current loss and serves as a shielding film for the magnetic force lines. As the material of the core 1170, it has been described that ferrite can be used.

The temperature sensor 1181 is configured to measure the temperature of the liquid heated in the hot water tank 1130. The bracket 1160 is formed with a temperature sensor receiving portion 1165 formed to receive the temperature sensor 1181 and a temperature sensor 1181 is inserted into the temperature sensor receiving portion 1165. Since the center of the working coil 1140 having an annular shape is empty, the temperature sensor 1181 can be disposed at the center (or inward of the annular shape) of the working coil 1140.

The temperature measured by the temperature sensor 1181 is provided to the induction heating printed circuit board 1110 and the control module 1080 described in FIG. The induction heating printed circuit board 1110 and the control module 1080 determine whether to further heat or stop heating based on the temperature of the liquid measured at the temperature sensor 1181. In other words, the output of the induction heating module 1100 can be determined based on the temperature measured at the temperature sensor 1181. [ As the temperature sensor 1181, a thermistor may be used.

The overheat prevention fuse 1182 is a safety device that cuts off power to the induction heating module 1100 when the liquid in the hot water tank 1130 is excessively overheated. Unlike the case where the temperature sensor 1181 is classified as a return type sensor, the overheat preventing fuse 1182 can be classified as a non-return type sensor because it needs to be replaced once it operates.

The bracket 1160 is formed with an overheat preventing fuse receiving portion 1166 formed to receive the overheat preventing fuse 1182 and the overheating preventing fuse 1182 is inserted into the overheating preventing fuse receiving portion 1166. The overheat preventing fuse 1182 may also be disposed at the center (or inside of the annular shape) of the working coil 1140 like the temperature sensor 1181.

The bracket 1160 has a position fixing portion 1167. The position fixing portion 1167 is fixed along the line corresponding to the annular inner periphery to fix the position of the working coil 1140, the spacers 1151 and 1152 and the insulator so as to support the inner periphery of the working coil 1140, 1168, respectively. The position fixing portions 1167 may be provided in a plurality of positions and may be spaced apart from each other.

The positions of the working coil 1140, the spacers 1151 and 1152 and the insulator 1153 are fixed by the position fixing portion 1167 of the bracket 1160 and the positions of the working coil 1140, the spacers 1151 and 1152, The insulator 1153 is brought into close contact with each other by the hot water tank 1130 coupled to the bracket 1160. Therefore, the position of the working coil 1140, the spacers 1151 and 1152 and the insulator 1153 can be fixed even if there is no additional fixing structure or sealant, and the gap between the hot water tank 1130 and the working coil 1140 is constant .

Furthermore, the bonded structure of the sealant may show different work results depending on the process, and it may be difficult to control the induction heating depending on the work result. Therefore, the sealant bonded structure is disadvantageous in mass production. However, as in the present invention, the coupling structure by the screws 1800a, 1800b, 1800c, and 1800d is advantageous for mass production since the operation results are not different depending on the process.

The silicon cover 1183 is coupled to the bracket 1160 to cover the temperature sensor 1181 and the overheating protection fuse 1182. The silicon cover 1183 may be configured to surround the outer circumferential surface of the position fixing portion 1167. For smooth temperature measurement of the temperature sensor 1181, the silicon cover 1183 may have a hole.

Fig. 6 is a side view showing the configuration corresponding to the line A-A in Fig. 5 to show the coupling structure of the induction heating module 1100 (see Fig. 4).

6 shows a structure in which the rim of the hot water tank 1130 is coupled to the boss portion 1161a of the bracket 1160 by the screw 1800a. The rim of the hot water tank 1130 is formed at a position corresponding to the boss portion 1161a of the bracket 1160. [ When the screw 1800a is fastened to the boss portion 1161a, the rim of the hot water tank 1130 is disposed between the head of the screw 1800a and the boss portion 1161a.

6, an insulator 1153, a working coil 1140 and spacers 1151 and 1152 are sequentially disposed between the first cover 1131 of the hot water tank 1130 and the base portion 1168 of the bracket 1160 . The base portion 1168 of the bracket 1160, the insulator 1153, the working coil 1140, the spacers 1151 and 1152, and the first cover 1131 are arranged to be in close contact with each other. The configuration in which the spacing G between the working coil 1140 and the hot water tank 1130 is kept constant is shown in FIG.

The water pipe 1132b, the second cover 1132, the hot water tank support portion 1163, the position fixing portion 1167, the core accommodating portion 1164 and the core 1170, which are not illustrated in FIG. 6, I will change.

The purifier described above is not limited to the configuration and the method of the embodiments described above, but the embodiments may be configured by selectively combining all or some of the embodiments so that various modifications may be made.

Claims (13)

A working coil having an insulated conductor wound in an annular fashion; And
And a hot water tank arranged to face the working coil at a position spaced apart from the working coil to be induction heated by the working coil,
In the hot water tank,
A first cover disposed opposite to the working coil and formed of a stainless steel material;
A second cover of stainless steel joined to the rim of the first cover to provide a flow and heating space of water with the first cover;
A protruding surface protruding from the second cover toward the first cover and disposed inside the flow and heating space of the water;
A water inlet pipe coupled to one side of the second cover;
An outlet tube coupled to the other side of the second cover; And
And a welding portion welded to each other to weld the projecting surface and the inner surface of the central portion of the first cover to each other. The method according to claim 1,
The first cover
An annular outer shell; And
And the central portion surrounded by the outer frame portion,
Wherein the projecting surface and the welded portion are formed at positions corresponding to the central portion. The method according to claim 1,
Wherein the welding portion has a shape of a closed curve between the projecting surface and the inner surface of the central portion of the first cover. The method according to claim 1,
Wherein the projecting surface is integrally formed with another portion of the second cover by partially pressing the second cover. The method according to claim 1,
The second cover
A base surface disposed to face the first cover at a location spaced apart from the first cover to form a flow and heating space for the water;
The protruding surface protruding from the base surface toward the second cover; And
And a circumferential portion formed to be inclined around the protruding surface so as to connect the base surface and the protruding surface to each other. 6. The method of claim 5,
The second cover further includes a protrusion protruding from the base surface toward the first cover,
Wherein a degree of separation of the projection from the first cover is between the base surface and the projecting surface. The method according to claim 6,
And the protruding portion extends toward the inlet pipe and the outlet pipe. The method according to claim 6,
Wherein the protruding portion has a constant width in a direction intersecting the extending direction of the protruding portion. The method according to claim 6,
And the protruding portion is integrally formed with another portion of the second cover by press working. The method according to claim 6,
The protruding portion
A first protrusion extending toward the inlet pipe and the outlet pipe; And
And a second protrusion extending in a direction intersecting the extending direction of the first protrusion. 11. The method of claim 10,
And the second protrusions are formed at both ends of the first protrusions, respectively. 11. The method of claim 10,
The height of the hot water tank in the vertical direction is longer than the width in the horizontal direction,
Wherein an extension length of the first protrusion is longer than an extension length of the second protrusion. The method according to claim 1,
Wherein the first cover is formed to be induction heated by the working coil,
Wherein the second cover is disposed on the opposite side of the working coil with respect to the first cover, and has a thickness thicker than that of the first cover.

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