KR100735911B1 - Apparatus for supplying water - Google Patents

Abstract

An apparatus for supplying water is provided to prevent users from suffering a burn due to a burst of a warm water tank by preventing pressure inside of the warm water tank from increasing too much. An apparatus(10) for supplying water includes a case(11), a cold water tank(14), a warm water tank(15), a compressor(12), a cold water tank installing unit(17), a condenser(13), a vaporizer(18), and a cold and warm valve(171). The cold water tank is installed within a top of the case. The warm water tank is installed on a bottom of the cold water tank. The compressor is installed on a bottom of the case to compress refrigerant. The cold water tank installing unit makes the cold water tank installed. The condenser condenses the refrigerant compressed by compressor. The refrigerant passing the condenser and a throttle device flows in the vaporizer. The cold and warm valve is protruded on a side of the case to make cold water and warm water discharged. And the apparatus further includes a barrier(21) installed inside of the cold water tank and a safety device(30) received inside of the barrier to prevent the warm water from flowing backward.

Description

Apparatus for supplying water

1 is a cross-sectional view showing a water supply device with a safety device according to the spirit of the present invention.

Figure 2 is an external perspective view of a safety device according to the spirit of the present invention.

3 is an exploded perspective view of the safety device.

4 is a partially enlarged cross-sectional view showing a state in which a safety device according to the spirit of the present invention is installed;

5 is a cross-sectional view showing a state in which the water supply to the hot water tank is blocked by the safety device according to the spirit of the present invention.

6 is a cross-sectional view showing a state in which the steam of the hot water tank is discharged into the cold water tank through the safety device according to the spirit of the present invention.

7 is a cross-sectional view showing a state in which the pressure inside the hot water tank is adjusted by the safety device according to the spirit of the present invention.

<Description of the symbols for the main parts of the drawings>

10: cold and hot water machine 11: case

12 compressor 13 condenser

14: cold water tank 15: hot water tank

16 connector 17 cold water container seat

18: evaporator 19: feed bottle inlet

20: cold water supply pipe 21: barrier

30: safety device 31: upper cap

32: plotter housing 33: spring

34: inner thread 35: plotter

36: outer thread

The present invention relates to a water supply device, and in more detail, to allow cold water and hot water to be selectively supplied, and to prevent the high temperature hot water stored in the hot water tank to flow back to the cold water tank, while the pressure inside the hot water tank is excessively increased. It relates to a cold and hot water supply device that can prevent the hot water tank is destroyed in advance.

In general, the water supply device is roughly divided into a cold and hot water to supply both cold and hot water, a water purifier to purify only the cold water and a water softener to lower the hardness of the water.

In detail, the cold / hot water group corresponding to one type of water supply device is roughly classified into a bucket-type hot and cold water filter and a filter-type cold and hot water machine.

In more detail, the bucket-type cold and hot water is equipped with a bucket for storing a certain amount of water, so that the water stored in the bucket is supplied in the cold water state or heated to be supplied in the hot water state.

In addition, the filter cold and hot water is so that the water supplied from the water pipe is directly connected to the cold and hot water, so that the water supplied is purified through the filter to be supplied in the cold or hot water.

On the other hand, in the case of the cold and hot water machine that is supplied with cold water and hot water as described above, the cold water tank and the hot water tank are connected to each other, it is configured not to mix the cold water and hot water. In the case of the cold and hot water machine, it is very important that the hot water stored in the hot water tank is flowed back into the cold water tank so that the temperature of the cold water is not increased. In addition, it is even more important to eliminate the risk of the hot water tank explosion, such as excessively high pressure inside the hot water tank.

In order to solve these problems, many techniques have been proposed in the related art, and for example, the previously filed patent 10-2003-38610. The application is equipped with a check valve mechanism therein to prevent the hot water stored in the hot water tank to flow back to the cold water tank. In other words, by installing a check valve inside the connection pipe connecting the hot water tank and the cold water tank, the hot water inside the hot water tank boiled to solve the problem of flowing back to the cold water tank.

However, the prior art as described above has the advantage of preventing the back flow of hot water, there is a problem that can not lower the hot water tank pressure when the inside of the hot water tank is overheated and the pressure is excessively high. That is, when the temperature sensor attached to the hot water tank is broken and the temperature of the hot water tank is heated above the set temperature, the hot water tank pressure becomes excessively high. In this state, the check valve maintains a state in which the inlet of the hot water tank is sealed, so there is a problem that the pressure inside the hot water tank cannot be lowered.

In this case, when the hot water tank does not withstand internal pressure and ruptures, there is a problem that the product is broken or a user around the hot and cold water heater is burned due to the rupture of the hot water tank.

The present invention has been proposed to solve the above problems, and prevents the hot water stored in the hot water tank to flow back to the cold water tank to prevent the cold water temperature from increasing, and even if the internal pressure of the hot water tank is excessively high, the pressure is automatically lowered. It is an object of the present invention to provide a water supply device capable of increasing the safety of the product.

Water supply apparatus according to the present invention for achieving the object as described above is cold water; A hot water tank connected to the cold water tank; Installed inside the cold water tank to prevent backflow of steam and hot water generated from the hot water tank, and at the moment when the hot water tank is overheated, a portion of steam and hot water is discharged to the cold water tank so that the hot water tank rupture is prevented. And a safety device, wherein the safety device includes a plotter for lifting and lowering according to the water level of the hot water tank, a case in which the plotter is accommodated, and an upper side of the plotter to set a lifting limit of the plotter. It includes an elastic member that contracts when the pressure of the hot water tank exceeds the set pressure.

In another aspect, the water supply device according to the present invention comprises a cold water reservoir in which cold water is stored; Hot water tank for heating the water supplied from the cold water tank to a high temperature; Is installed inside the cold water tank to prevent the pressure of the hot water tank is excessively increased, safety including a housing, a plotter to move up and down by buoyancy in the housing, and an elastic member for setting the lifting limit of the plotter Device; And a barrier installed inside the cold water container, dividing the cold water container up and down, and formed with an extension tube for accommodating the safety device.

In another aspect, the water supply device according to the present invention includes an accommodating portion including an upper cap in which a vapor discharge port is formed, and a plotter housing detachably coupled to the upper cap; A floating body vertically moving by buoyancy inside the receiving portion; An elastic member fitted to an inner circumferential surface of the upper cap to set a lifting limit of the floating body; A sealing member interposed between the elastic member and the floating body to prevent the leakage of hot water, and the elastic member is contracted at the moment when the hot water tank is overheated, thereby discharging a portion of steam or hot water into the cold water tank. It is characterized in that the pressure of the hot water tank is maintained below the set pressure.

By the above configuration, there is an effect of preventing the hot water from flowing back into the cold water tank and at the same time preventing the excessively high pressure of the hot water tank.

1 is a cross-sectional view showing a water supply device with a safety device according to the spirit of the present invention.

Referring to FIG. 1, as a preferred embodiment of a water supply device equipped with a safety device according to the present invention, a cold / hot water heater 10 to which cold water and hot water are supplied is proposed.

In detail, the cold and hot water heater 10 includes a case 11 forming an external appearance, a cold water container 14 embedded in an upper side of the case 11, and a hot water container installed below the cold water container 14. 15 and a compressor 12 mounted under the case 11 to compress the refrigerant.

In addition, the cold and hot water heater 10, the cold water container seating portion 17 to allow the cold water tank 14 is seated, a condenser 13 to condense the refrigerant compressed by the compressor 12, and the condenser ( 13 and an evaporator 18 through which the refrigerant passing through the throttling device (not shown) and a cold / hot water valve 171 protruding outside the case 11 to discharge cold water and hot water are further included.

In detail, the evaporator 18 is wound around the outer circumferential surface of the cold water container 14 a plurality of times, so that the refrigerant and the water stored in the cold water container 14 are exchanged. That is, the water in the cold water tank 14 is cooled to a low temperature through heat exchange with the refrigerant flowing along the evaporator 18.

In addition, the cold and hot water heater 10 further includes a barrier 21 installed in the cold water tank 14 and a safety device 30 accommodated in the barrier 21 to prevent backflow of hot water.

In addition, a water supply tank inlet 19 is formed at an upper end of the cold water tank 14, and a discharge port of the water supply tank is inserted into the water supply tank inlet 19. The cold water supply pipe 20 is mounted inside the water supply tank inlet 19 so that water supplied from the water supply tank flows into the cold water tank 14 through the cold water supply pipe 20.

On the other hand, the heater 151 is built in the hot water tank 15, the water supplied to the hot water tank 15 is heated to a high temperature. In addition, a temperature sensing device such as bimetal 152 is mounted on the surface of the hot water tank 15 to prevent the hot water tank 15 from overheating.

Hereinafter, a brief description of the water supply process of the cold and hot water heater 10 according to the present invention constituting the configuration as described above.

First, the water tank is turned upside down so that the outlet portion is inserted into the water tank inlet 19. Then, the water discharged from the water supply tank is sequentially stored in the cold water tank 14 and the hot water tank 15. When power is applied to the cold / hot water machine (10), the compressor (12) is driven to compress the refrigerant to high temperature and high pressure. In addition, the low-temperature low-pressure refrigerant passing through the condenser 13 and the throttling device flows along the evaporator 18 to exchange heat with the water in the cold water tank 14. At the same time, the heater 151 mounted inside the hot water tank 15 is operated to heat the water of the hot water tank 15 to a high temperature.

In this state, when the user operates the cold / hot water valve 171, cold water or hot water is discharged to the outside through each valve.

Hereinafter, the structure and operation of the safety device 30 according to the spirit of the present invention will be described in more detail with reference to the accompanying drawings.

2 is an external perspective view of a safety device according to the spirit of the present invention, Figure 3 is an exploded perspective view of the safety device.

2 and 3, the safety device 30 according to the present invention is inserted into the barrier 21.

In detail, the safety device 30 includes an upper cap 31, a plotter housing 32 coupled to the lower side of the upper cap 31, and a vertical reciprocating motion caused by buoyancy by being inserted into the plotter housing 32. A floater 35, a spring 33 inserted into and supported by the upper cap 31, an inner seal 34 fitted to a lower end of the spring 33, and the upper cap 31. An outer seal (36) fitted to the outer circumferential surface thereof.

In more detail, a vapor discharge hole 312 having a predetermined size is formed at the center of the upper surface of the upper cap 31. In addition, a vapor discharge groove 311 of a predetermined length is further formed on the side surface of the upper cap 31. The vapor discharge grooves 311 extend to the vapor discharge holes 312 to communicate with each other. The steam ejected from the hot water tank 15 is discharged into the cold water tank 14 through the discharge hole 312 and the steam discharge groove 311.

In addition, the plotter housing 32 has a support leg 321 of a predetermined length extending downward, and the end of the support leg 321 is bent toward the center to form a plotter seating portion 322. The support legs 321 are formed in plural at regular intervals, and the support legs 321 are opened between the support legs 321.

In addition, the plotter 35 is in the form of a ball having a predetermined diameter, has a predetermined buoyancy, the height is variable according to the water level stored in the hot water tank (15). In addition, the upper cap 31 and the plotter housing 32 form a cylindrical shape in which the plotter 35 can be accommodated. Of course, if the plotter 35 has a polygonal shape instead of a spherical shape, the horizontal cross-sectional shape of the upper cap 31 and the plotter housing 32 will also form the same shape as the plotter 35.

On the other hand, the inner chamber 34 is interposed between the spring 33 and the plotter 35, the steam generated in the hot water tank 15 when the floater 35 is raised and in close contact with the inner chamber 34. Is prevented from entering the cold water tank (14).

In addition, the spring 33 is a tension spring having an elastic force of a predetermined size, preferably an elastic force capable of withstanding the set pressure of the hot water tank (15). In other words, the spring 33 is contracted only when the pressure of the hot water tank 15 is equal to or higher than a set pressure, so that the steam inside the hot water tank 15 is discharged.

In addition, the outer seal 36 mounted on the lower outer circumferential surface of the upper cap 31 is mounted to prevent the occurrence of steam leakage in a portion in close contact with the barrier 21. Details thereof will be described in more detail below with reference to the accompanying drawings.

When the water level is increased by supplying water to the hot water tank 15 by the safety device 30 having the above configuration, the plotter 35 is raised to be in close contact with the inner seal 34. And, even if the water level of the hot water tank 15 is increased, the hot water does not flow back to the cold water tank 14 by the adhesion between the inter seal 34 and the plotter 35.

In addition, when the hot water tank 15 is overheated and the pressure is excessively high, the spring 33 contracts, and the steam inside the hot water tank 15 is discharged through the steam discharge hole 312 and the steam discharge groove 311. It is discharged to the cold water tank 14 through. Therefore, the phenomenon in which the hot water tank 15 ruptures due to high pressure is eliminated.

Hereinafter, the operation of the safety device will be described in more detail with reference to the accompanying drawings.

4 is a partially enlarged cross-sectional view showing a state in which a safety device according to the spirit of the present invention is installed.

4, the safety device 30 according to the present invention is mounted inside the barrier 21.

In detail, the barrier 21 is mounted at a predetermined position inside the cold water container 14 to allow the cold water container 14 to be divided into upper and lower parts. In addition, the outer diameter of the barrier 21 is formed to be substantially the same size as the inner diameter of the cold water tank (14). In addition, a cylindrical extension tube 222 is formed at a central portion of the barrier 21 extending downward a predetermined length. Then, the safety device 30 is fitted into the extension pipe 222. In addition, the barrier 21 is bent a plurality of times to form a dish shape, and a plurality of cold water dropping holes 221 are formed in the bottom portion.

In addition, the water tank inlet 19 is located directly above the barrier 21, and the lower end of the water tank inlet 19 is located at a point spaced a predetermined height away from the bottom surface of the barrier 21. . And, the cold water supply pipe 20 is inserted into the lower end of the water supply tank inlet (19).

In detail, the cold water supply pipe 20 includes a housing 201 and a hollow tube 202 inserted into the housing 201.

In more detail, the housing 201 has a shape in which a lower end is caught by a lower end of the water container inlet 19 and a central part extends by a predetermined height and diameter. In addition, the lower end of the water container inlet 19 is sealed by the housing 201. In addition, an inflow hole 202a having a predetermined size is formed on an upper outer circumferential surface of the housing 201 to allow the inside and the outside of the housing 201 to communicate with each other.

In addition, an inlet hole 201a having a predetermined size is formed on the upper outer circumferential surface of the hollow tube 202 inserted into the housing 201. And, it is located at a point coinciding with the inlet hole (202a) of the housing 201, so that the water supplied to the feed tank inlet 19 is dropped along the inside of the hollow tube (202).

On the other hand, the lower end of the hollow tube 202 is located directly above the extension tube 222 of the barrier 21. Therefore, the water falling along the hollow tube 202 is dropped directly to the safety device 30.

In addition, a connector 16 having a predetermined length and diameter is connected to a lower end of the extension tube 222, and the connector 16 is accommodated in the hot water container 15. In addition, a steam hole 161 (see FIG. 5) is formed on an outer circumferential surface of the connector 16 accommodated in the hot water container 15. Therefore, the steam generated in the hot water tank 15 rises toward the safety device 30 through the steam hole 161.

By the above configuration, the water supplied from the water supply tank falls along the water supply tank inlet 19. Then, when the water level of the water falling along the water inlet 19 is increased to reach the height of the inlet hole (202a), it is introduced into the hollow tube 202 through the inlet hole (201a, 202a). . In addition, water introduced into the hollow tube 202 drops along the hollow tube 202.

In addition, a portion of the water falling along the hollow tube 202 is stored at the bottom of the barrier 21. Then, the water stored in the bottom of the barrier 21 is dropped to the bottom of the cold water tank 14 through the cold water drop hole 221. The remaining portion of the water falling along the hollow tube 202 is introduced into the safety device 30.

In detail, the water falling into the safety device 30 is introduced into the safety device 30 through the vapor discharge hole 312 formed in the upper surface of the upper cap 31. A portion of the water dropped into the barrier 21 is collected toward the extension tube 222. Then, the water collected toward the extension pipe 222 is introduced into the safety device 30 through the vapor discharge groove 311 formed on the side surface of the upper cap 31. Here, since the airtightness of the outer circumferential surface of the upper cap 31 and the inner circumferential surface of the extension pipe 222 is maintained by the outer seal 36 surrounded by the outer circumferential surface of the upper cap 31, the water collected in the extension pipe 222 All will flow into the safety device 30.

Meanwhile, water introduced into the safety device 30 falls and flows into the connector 16 through a space formed on the side of the plotter housing 32, that is, a space formed between the support legs 321. do. The water supplied to the connector 16 is finally stored in the hot water tank 15.

In addition, when the water level of the hot water tank 15 is increased to reach the extension pipe 222, the plotter 35 is raised by buoyancy. The rising plotter 35 is in close contact with the inner seal 34. Then, the water supply to the hot water tank 15 is stopped as soon as the floater 35 is in close contact with the inner chamber 34.

5 is a cross-sectional view showing a state in which the water supply to the hot water tank is blocked by the safety device according to the spirit of the present invention, Figure 6 is a state in which steam of the hot water tank is discharged to the cold water tank through the safety device according to the spirit of the present invention. 7 is a cross-sectional view showing a state in which the pressure inside the hot water tank is controlled by the safety device according to the spirit of the present invention.

Referring to FIG. 5, the hot water tank 15 is filled with water to show a state in which cold water is no longer supplied. In this state, the water in the cold water tank 14 is not supplied to the hot water tank 15. Not only that, but the reverse flow of hot water is impossible.

The heater 151 of the hot water tank 15 is operated while the connection between the cold water tank 14 and the hot water tank 15 is blocked, and the water of the cold water tank 14 is cooled by the evaporator 18. . In this state, since cold water and hot water are not mixed, heat loss does not occur.

Referring to FIG. 6, the plotter 36 is slightly spaced apart from the inner seal 34.

In detail, when the hot water tank 15 is heated, the temperature of the water is increased, and the heating of the water is stopped in the range of about 87 to 95 degrees Celsius. In other words, when the temperature of the water reaches about 95 degrees Celsius by the temperature sensing means such as the bimetal 152 mounted on the hot water tank 15, the driving of the heater is stopped.

Here, when the water temperature of the hot water tank 15 is about 95 degrees Celsius, some steam may occur because the temperature is very close to the boiling point. In this case, the generated steam rises into the connector 16 through the steam hole 161. Then, the rising steam rises to the surface of the water. In addition, since the vapor is a gas, the vapor rises in the form of a bubble. Thus, the bubble-type vapor will burst on the water surface. In addition, a small space is formed between the inner chamber 34 and the water surface by the plotter 35, and steam is blown into the space. At this time, the moment the steam bursts from the surface of the plotter 35 is spaced apart from the inner chamber 34, the steam rising to the water surface through the steam discharge hole 312 formed in the upper surface of the upper cap 31 It flows into the cold water tank (14). By this process, a small amount of steam generated in the hot water tank 15 is leaked into the cold water tank little by little, so that the pressure of the hot water tank 15 is safely maintained below the set pressure. Further, since the amount of steam leaking through the steam discharge hole 312 is very small, the cooling efficiency of the cold water tank 14 is hardly affected.

Referring to FIG. 7, when the internal pressure of the hot water tank 15 is excessively high, the spring 33 is contracted so that steam inside the hot water tank 15 is discharged into the cold water tank 14.

In detail, in a state in which the temperature sensing member mounted on the hot water tank 15 is broken or inoperable, the temperature of the hot water tank 15 is increased above the boiling point. As a result, the pressure inside the hot water tank 15 becomes excessively high in an instant. In this case, the steam generated in the hot water tank 15 is concentrated toward the plotter 35 so that the plotter 35 is in close contact with the inner chamber 34. Therefore, the high pressure steam concentrated toward the plotter 35 is not discharged to the outside, thereby increasing the pressure.

At this time, when the pressure acting on the plotter 35 and the inner seal 34 is greater than or equal to the safety pressure, the spring 33 contracts. In other words, the spring 33 is selected that the elastic force is equal to or slightly less than the safety pressure of the hot water tank 35. Therefore, when the internal pressure of the hot water tank 35 is greater than or equal to the set safety pressure, the spring 33 is contracted, and the inner seal 34 and the plotter 35 are simultaneously raised by the contraction of the spring 33. do.

In detail, when the inner seal 34 and the plotter 35 ascend higher than the lower end of the steam discharge groove 311 formed long on the side of the upper cap 31, the vapor concentrated in the safety device 30 Is discharged to the cold water tank 14 through the steam discharge groove 311. In addition, a portion of the hot water may also be discharged to the cold water container 14 in the process of discharging the steam.

By this operating principle, if the pressure inside the hot water tank 15 becomes excessively high, steam or hot water inside the hot water tank 15 is quickly released to the cold water tank 14, so that the hot water tank 15 ruptures. The risk of being removed can be eliminated. That is, since preventing the rupture of the hot water tank 15 has a greater effect than reducing the cooling efficiency of the cold water tank 14, the hot water tank 15 even if the cooling efficiency is slightly reduced at the moment when the hot water tank 15 is overheated. It would be desirable to keep this secure.

In addition, in the structure of the safety device 30 according to the present invention, when the pressure of the hot water tank 15 is too excessive, and the pressure is not reduced despite the contraction of the spring 33, the safety device 30 ) Itself is separated from the extension pipe (222).

In detail, the safety device 30 is assembled into the extension pipe 222 but does not engage with the extension pipe 222. However, the safety device 30 is supported by the friction force generated between the outer seal 36 surrounding the outer circumferential surface of the upper cap 31 and the inner circumferential surface of the extension tube 222. In addition, the frictional force is greater than the pressure inside the hot water tank 15, so that only the upper cap 31 is separated from the plotter housing 32 only when the pressure of the hot water tank 15 is excessively increased, or the safety device ( 30) the whole is separated from the extension pipe 222.

By the water supply device according to the present invention constituting the above configuration, there is an effect of preventing the phenomenon that the pressure inside the hot water tank is excessively increased.

Furthermore, the phenomenon in which the pressure inside the hot water tank is excessively increased is prevented, thereby removing the risk of the user getting burned by the hot water tank rupture.

In addition, since the safety device according to the present invention is provided, even when the temperature sensing means mounted on the hot water tank does not operate due to a failure, the excessively high pressure of the hot water tank is prevented, and thus the double safety function is performed. There is.

Claims (21)

Cold water bottle; A hot water tank connected to the cold water tank; Installed inside the cold water tank to prevent backflow of steam and hot water generated from the hot water tank, and at the moment when the hot water tank is overheated, a portion of steam and hot water is discharged to the cold water tank so that the hot water tank rupture is prevented. Includes a safety device; The safety device is a floater for lifting in accordance with the water level of the hot water tank; A case in which the plotter is accommodated; And an elastic member provided on an upper side of the plotter to set a lifting limit of the plotter, and contracted when the pressure of the hot water tank exceeds a set pressure. The method of claim 1, The water supply device is supported by the elastic member inside the case. The method of claim 1, And a sealing member interposed between the plotter and the elastic member. The method of claim 1, The elastic member is a water supply device, characterized in that the spring having an elastic force of approximately the same as the set pressure inside the hot water tank. The method of claim 1, The water supply device is installed in the cold water container, further comprising a barrier for receiving the safety device. The method of claim 1, Feeding tank inlet coupled to the upper side of the cold water container, Water supply device further comprises a cold water supply pipe coupled to the bottom of the water supply inlet. The method of claim 6, The cold water supply pipe and the housing for sealing the lower end of the feed container inlet; Further comprising a hollow tube inserted into the housing, Water supply apparatus, characterized in that the cold water inlet hole is formed at any point of the housing and the hollow tube. The method of claim 1, Further comprising a connector for connecting the cold water tank and the hot water tank, Water supply apparatus, characterized in that the steam hole is formed at any point of the connector accommodated in the hot water tank. A cold water reservoir in which cold water is stored; Hot water tank for heating the water supplied from the cold water tank to a high temperature; Is installed inside the cold water tank to prevent the pressure of the hot water tank is excessively increased, safety including a housing, a plotter to move up and down by buoyancy in the housing, and an elastic member for setting the lifting limit of the plotter Device; And a barrier installed inside the cold water container, dividing the cold water container up and down, and having an extension tube for accommodating the safety device. The method of claim 9, The safety device is a water supply device, characterized in that is inserted detachably from the extension tube when the pressure of the hot water tank is excessively high. The method of claim 9, The plotter is a water supply device, characterized in that the spherical shape having a predetermined diameter. The method of claim 9, The housing has an upper cap to which the elastic member is fitted; Water supply apparatus comprising a plotter housing detachably coupled to the upper cap. The method of claim 12, The upper cap includes a vapor discharge hole formed in the upper surface, and at least one vapor discharge groove formed in the side portion, The water supply device, characterized in that the steam discharge hole and the vapor discharge groove is in communication with each other. The method of claim 12, The plotter housing includes a plurality of support legs extending a predetermined length downward, The support leg is bent in the center direction so that the floater is seated. The method of claim 9, The housing is a water supply device, characterized in that separated in two parts when the pressure of the hot water tank is excessively high. The method of claim 9, The safety device further includes a sealing member surrounded by an outer circumferential surface of the housing and in close contact with the inner circumferential surface of the extension tube. The method of claim 9, The safety device, the water supply device further comprises a leakage preventing member to prevent the phenomenon that the cold water flows into the hot water tank through the gap between the extension tube and the safety device, or the leakage of steam rising from the hot water tank to the cold water tank. The method of claim 9, The safety device, the water supply device is inserted into the housing, the water supply device further comprises a sealing member to be in close contact with the plotter in a state that the internal pressure of the hot water tank is less than the set pressure to block the back flow of hot water. The method of claim 9, A water supply pipe positioned above the barrier to allow a portion of the water supplied from the water supply tank to fall into the safety device; The water supply device is inserted into the water supply pipe, the water supply device further comprises a water supply tank injection portion is seated on the upper side. The method of claim 19, A water supply hole is formed at an outer circumferential surface of the water supply pipe so that water supplied to the water supply tank inlet is introduced into the cold water container and the safety device. An accommodating part including an upper cap having a vapor discharge port formed therein and a plotter housing detachably coupled to the upper cap; A floating body vertically moving by buoyancy inside the receiving portion; An elastic member fitted to an inner circumferential surface of the upper cap to set a lifting limit of the floating body; And a sealing member interposed between the elastic member and the floating body to prevent the leakage of hot water. The elastic member is contracted at the moment when the hot water tank is overheated, so that a part of steam or hot water is discharged into the cold water tank so that the pressure of the hot water tank is maintained below a set pressure.

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