KR20100032288A - Hot water boiler - Google Patents

Abstract

PURPOSE: A hot water boiler is provided to reduce the manufacturing cost due to the small volume and simplified structure. CONSTITUTION: A hot water boiler(100) comprises a water tank(110), an immersed heating pipe(120) which is vertically immersed in the water tank to allow circulating water in the water tank to be entered into, carried through and discharged from the immersed heating pipe, a metal pipe heater unit assembly(130) which heats the circulating water flowing through the space with the immersion heating tube, a plate type heat exchange unit(150) which transfers heat to hot water while the circulating water flows, and a circulating pump(160) which is installed in the cycle of the circulating water in order to give a feed force.

Description

Hot Water Boiler {HOT WATER BOILER}

The present invention relates to a hot water boiler, and more particularly, it can provide improved superiority in many aspects such as excellent thermal efficiency, small size and volume, so that it can be suitably used in demand such as a bathroom using a large amount of hot water. It is about a hot water boiler.

In general, a boiler is a device that heats water with a heating means and supplies it to a demand place, and is classified into an electric boiler, a gas boiler, an oil boiler, and the like according to the fuel used by the heating means.

Among them, electric boilers are convenient to use because they do not need to be replenished with fuel as compared to other boilers, and they are easy to use, have a relatively simple structure, maintain cleanliness, and have a relatively high risk of accidents caused by overheating. It is widely used in many advantages such as low.

In this regard, the importance of thermal efficiency has become more important in recent years due to the drastic rise in fuel costs.

In particular, the use of a large amount of hot water in the bathhouse is increasing the cost of producing hot water day by day, causing management deterioration.

Therefore, by producing a large amount of hot water stably with excellent thermal efficiency, it is possible to reduce the maintenance cost, and to reduce the initial purchase cost due to the low manufacturing cost, and also to reduce the size and volume of the small space Hot water boiler for the bathroom that can be installed smoothly is required.

The present invention was devised to solve the above-mentioned problems, and the thermal efficiency is extremely excellent, and the maintenance cost can be greatly reduced, and the manufacturing cost can be reduced due to the simplification and the small size, and it is also suitable for miniaturization. The purpose is to provide a hot water boiler.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

Hot water boiler of the present invention for achieving the above object, the reservoir is stored in the circulation water; An immersion heating tube provided to be immersed in the storage container in a vertical direction and being discharged after the circulating water in the reservoir is introduced and transported therein; A metal tube heater unit assembly positioned to be long inserted in the immersion heating tube and to heat the circulating water flowing through a space between the immersion heating tube and the immersion heating tube; It is provided so as to be immersed in the reservoir and is discharged from the immersion heating tube flows in the outer flow path and then the high temperature heat is transferred to the hot water flowing through the inner flow path in the process of the circulation water discharged into the reservoir flows inside A plate heat exchange unit; And a circulation pump provided on a circulation path of the circulation water to impart a transfer force to the circulation water. It includes.

Preferably, the circulating water inlet pipe is connected to the lower portion of the reservoir and the immersion heating tube to transfer the circulating water and the circulation pump is provided on a portion located outside the reservoir; It may further include.

Also preferably, the intermediate connecting pipe is connected to the immersion heating tube and the plate-type heat exchange unit in communication with each other to transfer the circulating water and is located in the reservoir; It may further include.

Also preferably, the immersion heating tube may be provided so that two or more parallel.

Also preferably, the metal tube heater unit assembly may include at least one metal tube heater provided with a heating wire and a filler in the metal protective tube and generating heat according to the energization of the heating wire; And a plurality of spaced out portions of the metal tube heater spaced apart from each other along a length direction to block the flow of the circulating water, and an area erased portion in which a portion of the outer portion is deleted so as to face different directions. A horizontal heat transfer plate through which the circulating water passes; It may be configured as.

Also preferably, the metal tube heater unit assembly may include a fastening plate member provided in a horizontal direction to engage an upper end of the metal tube heater and covering the outer surface of the reservoir; A vertical rod provided in the vertical direction so as to be suspended from the fastening plate member; And a spacing tube member spaced apart from the horizontal heat transfer plate by repeatedly inserted into an outer side of the vertical rod. It may be configured to further include.

Also preferably, the plate heat exchange unit may include: a first outer plate which closes an outer side of one side and each of which has a circulating water inlet and a circulating water outlet formed at upper and lower ends thereof; A second outer plate closing the outside of the other side and having a hot water inlet and a hot water outlet respectively formed at upper and lower ends thereof; Two sheets are inserted in parallel so as to be spaced apart at regular intervals on both sides between the first and second outer plates, and a circulation water flow path is formed between the first and second outer plates and hot water flows therebetween. A heat transfer plate forming a furnace; Communication pipes provided at the upper and lower ends to horizontally connect the two heat transfer plates so as to connect between the circulation water flow paths on both sides; And a side plate provided to close the side; It can be configured as.

Also preferably, on the heat transfer plate, the depressions and ridges may be generally formed through both sides.

Also preferably, the plate heat exchange unit may be positioned to be inserted into a space between the immersion heating tubes of adjacent two sides.

According to the present invention, it is possible to provide a very good thermal efficiency, thereby reducing the maintenance cost, and the effect of achieving a miniaturization while reducing the manufacturing cost due to the small size and volume can be achieved.

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

1 is a block diagram showing a hot water boiler according to a preferred embodiment of the present invention.

The hot water boiler 100 according to the present invention is provided with a reservoir 110 in which circulating water used as a heat transfer fluid is stored therein, and immersed in the reservoir 110 in a vertical direction to be circulated in the reservoir 110. The immersion heating tube 120 which is discharged after the water is introduced and discharged, and is inserted into the center of the immersion heating tube 120 to be long and is heated to heat the circulating water flowing through the space between the immersion heating tube 120. The metal tube heater unit assembly 130 is positioned to be immersed in the reservoir 110, and the circulating water introduced after being discharged from the immersion heating tube 120 flows through the outer passage of the inside and is discharged into the reservoir 110, and the outside thereof. At least one plate-type heat exchange unit 150 for high heat is transferred from the circulating water flowing in the flow path to the hot water flowing in the inner flow path, and at least one on the circulation path of the circulating water to give a transfer force to the circulating water And a circulation pump 160.

The reservoir 110 forms a storage space therein, and a predetermined amount of circulation water used as a heat transfer fluid is stored therein.

At least one mounting hole 112 is formed on the upper surface of the reservoir 110 to insert and immerse the heating tube 120 and the metal tube heater unit assembly 130 from the outside. A water inlet (not shown) for replenishing water is formed.

The immersion heating tube 120 has a long tube shape in which a through hole through which the circulating water of the heating target flows is formed, and the metal tube heater unit assembly 130 is inserted into the central portion thereof in a lengthwise direction.

The immersion heating tube 120 is positioned vertically inserted into the water reservoir 110, and the metal tube heater unit assembly 130 is inserted and positioned at an inner center thereof. ) Is opened for insertion, and its bottom surface is closed.

At one end of the upper and lower ends of the immersion heating tube 120, an inlet hole 122 is formed which is introduced into the water reservoir 110 after being directly inflowed or transferred through a separate pipe, and the other end of the other end. The portion is formed with an outlet hole 124 through which the heated circulating water flows out.

That is, the inlet hole 122 and the outlet hole 124 are formed at one end opposite to the upper end and the lower end of each other.

Immersion heating tube 120 is preferably provided in two or more in parallel multiple, in this case two or more immersion heating tube 120 is connected to communicate with each other through the communication portion 126, the communication portion ( 126 connects the outlet hole 124 of the immersion heating tube 120 provided in the front end and the inlet hole 122 of the immersion heating tube 120 provided in the rear end.

As such, when two or more parallel immersion heating tubes 120 are used, the circulating water conveyed through the inside may flow to repeat the downward flow and the upward flow.

Of course, two or more parallel immersion heating tube 120 may be configured to form a U-shape is connected to communicate with each other at the lower end of the two sides.

The inlet hole 122 may be connected to the circulating water inlet pipe 115, and the outlet hole 124 may be connected to an intermediate connector pipe for transferring the heated circulating water to the plate heat exchange unit 150. 140 are connected in communication.

Here, the circulating water inlet pipe 115 may be located in the reservoir 110, and some may be located outside the reservoir 110.

1 illustrates a case where the circulating water inflow pipe 115 is located outside of some reservoirs 110.

The immersion heating tube 120 may be formed of a metal material of a kind that can withstand high temperatures smoothly and also provide excellent corrosion resistance.

Since the immersion heating tube 120 is provided so as to be immersed in the circulating water in the reservoir 110, by heating the circulating water in the reservoir 110 without losing heat dissipated outward therefrom, it is possible to maximize the thermal efficiency.

Of course, since the immersion heating tube 120 is located in the reservoir 110, the size and volume can be significantly reduced.

The metal tube heater unit assembly 130 is inserted into the immersion heating tube 120, respectively, and is positioned long in the longitudinal direction, and allows the circulating water of the heating target to flow through a space between the immersion heating tube 120 and the immersion heating tube 120.

Specifically, the metal tube heater unit assembly 130 has a heating line 132b and a filler in the metal protective tube 132a, as shown through the perspective view of FIG. 2, the schematic sectional view of FIG. 3, and the separated perspective view of the main portion of FIG. 4. 132c is provided with at least one metal tube heater 132 and the horizontal plate is provided on the outside of the metal tube heater 132 and a plurality of horizontal plates spaced apart from each other along the longitudinal direction provided by the heating of the heating wire (132b) An area deleting unit 134a which blocks the flow of the circulating water and deletes an area of the outer part thereof is alternately provided to face different directions, so that the circulating water flows in a zigzag form.

In addition, the metal tube heater unit assembly 130 is provided in the horizontal direction to couple the upper end of the metal tube heater 132, the metal tube heater unit assembly 130 is inserted through the mounting hole 112 on the reservoir 110 A fastening plate member 136 that is caught on the top surface of the water reservoir 110 to close the mounting hole 112 when mounted, and a vertical rod 138 that is elongated in the vertical direction so as to be suspended from the fastening plate member 136; It may further include a spaced apart tube member 139 which is inserted into the outer side of the vertical rod 138 closely and spaced apart from the horizontal heat transfer plate 134.

The metal tube heater 132 includes a metal protective tube 132a in which the upper end portion of the metal tube heater 132 is sealed by a sealing plug or the like, a heating line 132b provided in the metal protective tube 132a to generate heat according to the current flow, and a heating line 132b. A connection terminal 132b-1 coupled to both ends of each of the ends) and externally exposed through an open upper end side of the metal protective tube 132a, and then connected to an external power supply device through an externally exposed portion to transmit current; , The filler 132c is filled in the empty space in the metal protective tube 132a to provide insulation and heat storage.

The metal tube heater 132 is not particularly limited, such as a straight, U-shaped, multiple bent, etc., but the U-shaped in the drawings.

And, the metal tube heater 132 may be provided in a plurality of sets as shown.

Of course, the metal tube heater 132 and the vertical rod 138 may be provided to suspend the other member for closing the mounting hole 112 of the reservoir 110 without using the fastening plate member 136.

The horizontal heat transfer plate 134 is a thin horizontal metal plate, and has an area deletion portion 134a formed by removing a predetermined area of an outer portion thereof.

Since the plurality of horizontal heat transfer plates 134 are provided in the immersion heating tube 120 to be spaced apart from each other by a predetermined distance along the longitudinal direction, the area deletion portions 134a are alternately provided to face different directions. Allow the circulating water to flow in a zigzag form.

That is, when the area deletion portion 134a of the first horizontal heat transfer plate 134 is provided to face to the right direction, the area deletion portion 134a of the next second horizontal heat transfer plate 134 is provided to face to the left direction, The direction may be provided to be repeatedly changed by 180 °.

Of course, the direction of the area deleting unit 134a does not necessarily need to be changed to 180 °, and the change angle may be implemented in any number of combinations. It can be made to be heated enough while being moved to a state, it can be excellent in terms of heating efficiency.

The horizontal heat transfer plate 134 is preferably formed such that its outer circumferential surface is in intimate contact with the inner circumferential surface of the immersion heating tube 120, which does not form a gap between the immersion heating tube 120, so that the circulating water goes straight through the gap. It is to be blocked.

Since the horizontal heat transfer plate 134 is provided to be in intimate contact with the outer surface of the metal tube heater 132, the horizontal heat transfer plate 134 may receive high heat from the metal tube heater 132 more efficiently in accordance with the corresponding contact.

The vertical rods 138 are coupled to hang on the fastening plate member 136 to be elongated along the length direction in the inside of the immersion heating tube 120, and a plurality of horizontal heat transfer plates 134 are fitted thereto.

The spaced tubular member 139 is in the form of a tube of a very small size, and is inserted into the vertical rods 138 and is provided between the horizontal heat transfer plates 134 fitted with respect to the vertical rods 138. (134) spaced apart by that length.

The action of the plurality of horizontal heat transfer plate 134 is to block the progress of the circulating water flowing in the longitudinal direction after being introduced, by allowing the circulating water to exit through the area elimination section 134a provided in a different direction In addition, it functions to induce the circulating water to flow in a zigzag form.

Therefore, since the flow rate of the heating target circulating water is appropriately decelerated as it is blocked, and flows in a zigzag form in such a decelerated state, the circulating water to be heated is sufficiently sufficiently heated by the high heat emitted from the metal tube heater 132. As can be, the circulating water can be sufficiently in contact with the metal tube heater 132 for a very long time.

Accordingly, even if the length of the metal tube heater 132 is made very short or the number of the metal tube heaters 132 is small, the circulating water can be sufficiently heated.

In addition, since the horizontal heat plate 134 is made of a metal material and is in contact with the metal tube heater 132, the horizontal heat transfer plate 134 is in contact with or positioned around the first heat state, which is itself heated by heat transferred from the metal tube heater 132. By heating the circulating water, the circulating water can be heated more effectively.

That is, the metal tube heater 132 and the horizontal heat transfer plate 134 cooperate to heat the circulating water in various directions, so that the circulating water can be heated very quickly and sufficiently.

According to him, the circulating water may be heated evenly by the horizontal heat transfer plate 134 along with the zigzag-extended length, so that the circulating water may be sufficiently stirred in the process.

The plate heat exchange unit 150 is discharged after passing through the immersion heating tube 120 is discharged into the water reservoir 110 after flowing the inner flow path of the heated state flows inside the inside, and the inside from the flowing circulation water High heat is transferred to hot water flowing through the flow path to generate hot water in a high temperature state.

Specifically, the plate heat exchange unit 150, as shown in Figures 5 to 8, the heat is taken away while passing through the inside and the circulation water inlet 152a through which the circulation water in a heated state is closed The first outer plate 152 formed at the upper and lower end portions of the circulating water outlet 152b for discharging the cooled water circulated to some degree in the reservoir 110, and in a cooled state in which water is being supplied while closing the outside of the other side. A second outer plate 154 having a hot water inlet 154a through which the hot water flows in and a hot water outlet 154b through which the hot water converted to a high temperature flows out are formed at upper and lower positions, respectively; Circulation water flow, which is an outer flow path in which circulation water flows between the second outer plates 152 and 154 so as to be inserted in parallel so as to be spaced at regular intervals on both sides between the second outer plates 152 and 154, respectively. The heat transfer plate 156 is formed to form a furnace (hw) and form a hot water flow path (lw), which is an inner flow path through which hot water flows, and the ridges 156a and the recesses 156b are generally repeated on both sides thereof. ) And a side plate 158 provided to close and seal the open side surfaces between the first and second outer plates 152 and 154.

The plate heat exchange unit 150 has a compact shape in the form of a hexahedron.

The plate heat exchange unit 150 has a structure in which the first outer plate 152, the second outer plate 154, and the two heat transfer plates 156 are stacked in parallel with each other at regular intervals, and the side plates 158. It consists of a total of five plates, and all plates are made of thin metal plates.

Of course, the plate heat exchange unit 150 is configured to be sealed in the interior is positioned to be immersed in the circulating water in the reservoir 110, as the material is a metal does not lose any heat dissipated out therefrom without the reservoir ( By being heat transfer to the circulation water in 110, it is possible to maximize the thermal efficiency.

In addition, of course, since the plate heat exchange unit 150 is located in the reservoir 110, the size and volume can be significantly reduced accordingly.

Preferably, the inlet / outlet 152a, 152b through which the circulating water flows in and out of the plate heat exchange unit 150 is provided on the same side, and the inlet / outlet 154a, 154b through which hot water flows in and out is provided on the same side. .

The circulating water inlet 152a into which the circulating water is introduced and the hot water inlet 154a into which the hot water is introduced are provided to be spaced apart from each other at the upper and lower ends opposite to each other. The hot water outlet 154b that flows out is also provided to be spaced apart from the upper and lower ends opposite to each other.

The heat transfer plate 156 is provided with two sheets inserted in parallel so as to be spaced apart at regular intervals on both sides between the first and second outer plates 152 and 154, and each heat transfer plate 156 and each outer plate 152 are provided. , 154 is formed between the circulating water flow path (hw) through which the circulating water flows, and a hot water flow path (lw) through which hot water flows is formed between the two heat transfer plates 156.

The hot water inlet / outlet 154a and 154b is provided to communicate with the hot water flow path lw, and the circulating water inlet and outlet 152a and 152b is provided to communicate with the circulating water flow path hw. One or more communication tubes 159 are provided at the upper and lower ends of the inner side so as to horizontally connect the two heat transfer plates 156 so as to connect the circulation water flow paths hw.

As illustrated in FIG. 8, the heat transfer plate 156 is formed such that the ridges 156a protrude convexly on both sides thereof and the depressions 156b concave recessed.

The raised portion 156a and the recessed portion 156b may be formed by repeated punching on one side and the other side, and when the raised portion 156a is formed on one side at the same position, the other side The depressions 156b are formed on the phases, and the arrangement of the ridges 156a and the depressions 156b does not have a big relationship whether it is regular or irregular.

The raised portion 156a and the recessed portion 156b increase the heat exchange area to improve heat exchange efficiency.

That is, the high heat from the circulating water is transferred to the circulating water flow path hw and the hot water flow path lw formed on both sides with the heat transfer plate 156 therebetween, respectively. In the heat transfer through the warm water, the ridge 156a and the depression 156b on the heat transfer plate 156 increase the heat transfer area to increase the heat transfer efficiency.

Therefore, as the heat exchange efficiency is excellent, the size and volume can be significantly reduced.

In addition, the ridge 156a and the depression 156b also prevent the progress of the circulating water and hot water to form a turbulent flow of the circulating water and hot water, thereby providing a function of uniformly heating and cooling the circulating water and hot water. do.

The heat transfer plate 156 is basically formed of a metal material having excellent thermal conductivity and heat dissipation and good mechanical and chemical properties, and preferably, may be formed of a stainless material that can withstand high temperatures and durability.

The side plate 158 surrounds and closes the side surface between the first outer plate 152 and the second outer plate 154 on both sides, and may be coupled and integrated through welding.

The circulating water inlet 152a on the plate-type heat exchange unit 150 may be directly connected to the outlet hole 124 of the immersion heating tube 120, but if it is desired to implement the direct connection, rather, the manufacturability may be poor. Preferably, the intermediate connection pipe is provided to connect the circulation water inlet 152a of the plate-type heat exchange unit 150 and the outlet hole 124 of the immersion heating tube 120 to internally transport the heated circulation water ( 140).

Of course, since the intermediate connecting pipe 140 is also located in the reservoir 110, by heating the circulation water in the reservoir 110 with heat radiated outward therefrom, thereby improving thermal efficiency.

According to the present invention, when two or more immersion heating tubes 120 are provided in parallel as described above, the plate-type heat exchange unit 150 is inserted into and positioned in the space between the immersion heating tubes 120 on both sides. .

According to him, the size and volume can be significantly reduced, in particular, since the plate-type heat exchange unit 150 is wrapped by the immersion heating tubes 120 on both sides, so that the heat loss of the plate-type heat exchange unit 150 is cut off as much as possible. The heat transfer efficiency from the circulating water to the hot water can be improved.

Furthermore, for the hot water inlet 154a and the hot water outlet 154b formed on the second outer plate 154 of the plate heat exchange unit 150, the hot water to be heated is supplied from the external direct water system or the like. The hot water supply pipe 210 for transporting and supplying the hot water supply pipe 210 and the inside is connected to the hot water discharge pipe 220 for transporting and supplying hot water discharged after being heated to the demand destination, and the corresponding hot water supply pipe 210 and the hot water discharge pipe. 220 passes through the reservoir 110 and is drawn out.

Thus, as the plate heat exchange unit 150 is positioned in the reservoir 110, the hot water supply pipe 210 is also positioned to be immersed in the reservoir 160, so that the plate heat exchange unit 150 is supplied in a cooled state through the hot water supply pipe 210. The hot water may be preheated by some heated circulating water in the reservoir 110 before entering the plate heat exchange unit 150.

The circulation pump 160 is located at an appropriate position on the circulation water circulation path of the "reservoir 110-the immersion heating tube 120-the intermediate connector 140-the plate type heat exchange unit 150-the reservoir 110". At least one is provided to give a transfer force for the transfer of the circulating water.

The circulation pump 160 may be spaced away from the high temperature environment as much as possible, and may be extended so that its life is extended so as not to be immersed in the circulation water in the reservoir 110, and may be implemented using a low cost one.

Therefore, for this purpose, the lower end of the reservoir 110 and the inlet hole 122 of the immersion heating tube 120 is connected in communication with the circulation water inlet pipe 115 to pass through the outside of the reservoir 110, The circulation pump 160 may be provided at a location outside the reservoir 110 on the circulation water inlet pipe 115.

Of course, the number and position of the circulation pump 160 may be appropriately changed according to the desired capacity such that two parallel pumps may be used.

According to the present invention as described above, the immersion heating tube 120, the plate-type heat exchange unit 150 and the intermediate connecting tube 140 is provided to be immersed in the reservoir 110, the external divergence from them The resulting heat loss is completely prevented, providing maximum thermal efficiency.

In addition, the immersion heating tube 120 and the plate-type heat exchange unit 150 are both positioned in the reservoir 110, and the plate-type heat exchange unit 150 is positioned to be inserted into the space between the two immersion heating tube 120. Therefore, a very compact configuration is possible, which can greatly reduce the size and volume.

And, since the plate heat exchange unit 150 is provided to be wrapped by the immersion heating tube 120 on both sides, the heat loss is completely blocked and the heat exchange efficiency in the interior can be significantly improved.

In the foregoing description, it should be understood that those skilled in the art can make modifications and changes to the present invention without changing the gist of the present invention as merely illustrative of a preferred embodiment of the present invention.

1 is a block diagram showing a hot water boiler according to a preferred embodiment of the present invention,

Figure 2 is a perspective view showing a metal tube heater unit assembly provided in the hot water boiler according to a preferred embodiment of the present invention,

Figure 3 is a schematic cross-sectional view showing a metal tube heater unit assembly provided in the hot water boiler according to a preferred embodiment of the present invention,

Figure 4 is an exploded perspective view of the main portion of the metal tube heater unit assembly provided in the hot water boiler according to a preferred embodiment of the present invention,

5 is a perspective view illustrating an exterior of a plate heat exchange unit provided in the hot water boiler according to the preferred embodiment of the present invention;

6 is a cross-sectional view taken along the line AA ′ of FIG. 5;

7 is a cross-sectional view taken along line BB ′ of FIG. 5;

8 is a perspective view showing a heat transfer plate provided in the plate heat exchange unit provided in the hot water boiler according to a preferred embodiment of the present invention;

9 is an exploded perspective view illustrating a laminated structure of a plate heat exchange unit provided in the hot water boiler according to the preferred embodiment of the present invention.

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

100: hot water boiler 110: reservoir

112: mounting hole 115: circulating water inlet pipe

120: immersion heating tube 122: inlet hole

124: outflow hole 126: communication part

130: metal tube heater unit assembly 132: metal tube heater

132a: metal protective tube 132b: heating wire

132b-1: Connection terminal 132c: Filler

134: horizontal heat transfer plate 134a: area deletion portion

136: fastening plate member 138: vertical rod

139: spaced pipe member 140: intermediate connector

150 plate-type heat exchange unit 152 first outer plate

152a: circulating water inlet 152b: circulating water outlet

154: second outer plate 154a: hot water inlet

154b: hot water outlet 156: heat transfer plate

156a: ridge 156b: depression

158: side plate 159: communication tube

160: circulation pump 210: hot water supply pipe

220: hot water discharge pipe hw: circulating water flow path

lw: hot water flow furnace

Claims (9)

Reservoir with circulating water stored therein; An immersion heating tube provided to be immersed in the storage container in a vertical direction and being discharged after the circulating water in the reservoir is introduced and transported therein; A metal tube heater unit assembly positioned to be long inserted in the immersion heating tube and to heat the circulating water flowing through a space between the immersion heating tube and the immersion heating tube; It is provided so as to be immersed in the reservoir and is discharged from the immersion heating tube flows in the outer flow path and then the high temperature heat is transferred to the hot water flowing through the inner flow path in the process of the circulation water discharged into the reservoir flows inside A plate heat exchange unit; And A circulation pump provided on a circulation path of the circulation water to impart a transfer force to the circulation water; Hot water boiler comprising a. The method of claim 1, A circulation water inlet pipe configured to connect the lower portion of the reservoir and the immersion heating tube in communication with each other to transfer the circulation water, and the circulation pump is provided on a portion located outside the reservoir; Hot water boiler containing more. The method according to claim 1 or 2, An intermediate connecting tube connected between the immersion heating tube and the plate heat exchange unit to transfer the circulating water and positioned in the reservoir; Hot water boiler containing more. The method of claim 1, The immersion heating tube, Hot water boiler, characterized in that provided with two or more parallel. The method of claim 1, The metal tube heater unit assembly, At least one metal tube heater provided with a heating wire and a filler in the metal protective tube and generating heat according to the energization of the heating wire; And It is provided with a plurality of spaced apart from each other along the longitudinal direction on the outside of the metal tube heater to block the flow of the circulating water and the area deletion portion is deleted so that the area of the outer portion is deleted to face different directions through the area deletion portion Horizontal heat transfer plate to allow the circulation water; Hot water boiler, characterized in that consisting of. The method of claim 5, The metal tube heater unit assembly, A fastening plate member provided in a horizontal direction to couple the upper end of the metal tube heater to span the outer surface of the water reservoir; A vertical rod provided in the vertical direction so as to be suspended from the fastening plate member; And Spacing tube member spaced apart from the horizontal plate by repeatedly inserted into the outer side of the vertical rod; Hot water boiler, characterized in that further comprises. The method of claim 1, The plate heat exchange unit, A first outer plate which closes an outer side of one side and has a circulating water inlet and a circulating water outlet respectively formed at upper and lower ends thereof; A second outer plate closing the outside of the other side and having a hot water inlet and a hot water outlet respectively formed at upper and lower ends thereof; Two sheets are inserted in parallel so as to be spaced apart at regular intervals on both sides between the first and second outer plates, and a circulation water flow path is formed between the first and second outer plates and hot water flows therebetween. A heat transfer plate forming a furnace; Communication pipes provided at the upper and lower ends to horizontally connect the two heat transfer plates so as to connect between the circulation water flow paths on both sides; And A side plate provided to close the side; Hot water boiler, characterized in that consisting of. The method of claim 7, wherein The hot water boiler, characterized in that the depression and the ridges are formed on the heat transfer plate as a whole. The method of claim 4, wherein The plate heat exchange unit, Hot water boiler, characterized in that it is positioned so as to be inserted into the space between the immersion heating tube of the adjacent both sides.

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