JPH11118171A - Hot water heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a high temperature over-heated state of a combustion cylinder by a winding configuration of a heat exchanging pipe, improve a raising characteristic of hot water as well as a heat exchanging efficiency. SOLUTION: There are provided a burner port section 27 for mixing gasified fuel with combustion air; a heat exchanger 30 for use in heat exchanging combustion gas generated at the burner port section 27; and a hot water heat exchanger 32 for use in heat exchanging hot water through the heat exchanger. The hot water heat exchanger 32 is constructed such that the heat exchanging pipe 32 for use in heat exchanging hot water is wound around the outer circumferential surface of the combustion cylinder 29 with which the combustion flame contacts at the burner port section 27 as well as at an outer circumferential surface of the heat exchanger 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heat exchanger for a hot water heating apparatus for heating using hot water.

[0002]

2. Description of the Related Art Conventionally, in a hot water heating apparatus for exchanging heat in a process of burning a liquid fuel such as kerosene and discharging the combustion gas to secure high-temperature hot water, the combustion gas is discharged as shown in FIG. A water jacket 1 for storing hot water is formed around a path to be heated, and a heat exchanger 2 for forming a path for discharging combustion gas is provided, as shown in FIG. A hot water heat exchanger 3 for exchanging heat with hot water is attached to the outer peripheral surface of the device, and the hot water heat exchanger 3 is indirectly heated. The former is used for business use with relatively large capacity, and the burner structure etc. is taken to be a robust configuration, and the heat resistance of the burner part is also a material,
The design was designed with due consideration for its structure. The latter is used for home heating and the like having a relatively small capacity, and often has an instantaneous heating type configuration that emphasizes the speed of startup of heating after the start of operation.Combustion gas is used as a configuration of the hot water heat exchanger. A substantially circular pipe 3 is spirally wound around the outer peripheral surface of the heat exchanger 2 which forms a path for discharging water. Further, the burner unit 4 for burning liquid fuel such as kerosene vaporizes the fuel and emits the vaporized gas to form a flame, and the incomplete combustion gas which cannot be completely burned by the flame port 5 is formed. The combustion chamber 7 is configured to mix with secondary air introduced from a secondary air hole 6 provided downstream of the flame port 5 and to perform complete combustion. The heat exchanger 2 is arranged downstream of the burner section, and the hot water heat exchanger and the burner section are not directly related. For example, JP-A-8-42
As in 942, the hot water heat exchanger is configured to be wound around the outer peripheral surface of the heat exchanger, and is not configured to directly relate to the burner.

[0003]

However, in such a conventional structure, a heat exchanger for forming a path for discharging combustion gas is provided, and an outer peripheral surface of the heat exchanger is used for heat exchange of hot water. In the type in which a hot water heat exchanger is installed and the hot water is heated indirectly, the hot water heat exchanger is configured to be wound only on the outer peripheral surface of the heat exchanger that exchanges heat of the combustion gas, and is directly related to the burner. Since it is not provided with a configuration, the burner part, particularly the vicinity of the combustion chamber, is heated to a high temperature by combustion heat, and the material forming the combustion chamber needs to have heat resistance, and radiates heat from the combustion chamber part. The amount of heat also increases, causing a large amount of heat loss and radiant heat generated from the combustion chamber portion of other components that make the body of the device compact as in recent years. Influence there was also a problem of giving.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a flame port for mixing vaporized fuel with combustion air for combustion, and a combustion gas generated in the flame port. A heat exchanger for exchanging heat, and a hot water heat exchanger for heating hot water through the heat exchanger, wherein the hot water heat exchanger has an outer peripheral surface of a combustion cylinder with which a combustion flame contacts at the flame opening. In addition, a heat exchange pipe for heating hot water is wound around the outer peripheral surface of the heat exchanger.

According to the above invention, since the heat exchange pipe is also wound around the outer peripheral surface of the combustion cylinder, the combustion cylinder forming the combustion chamber heated to a high temperature by the combustion heat is cooled by circulation of hot water. As a result, the temperature of the combustion cylinder can be significantly reduced, the heat resistance of the combustion cylinder material can be improved, and the influence of radiant heat on other components can be reduced.
At the same time, the heat exchange is also performed in the high temperature combustion cylinder, so that the heat exchange efficiency can be improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is intended to mix a vaporized fuel with combustion air and burn it, and to exchange heat between combustion gas generated in the flame mouth. And a hot water heat exchanger for exchanging hot water through the heat exchanger. The hot water heat exchanger includes an outer peripheral surface of a combustion cylinder with which a combustion flame contacts the burner section. The heat exchanger pipe for heat exchange of hot water is wound around the outer peripheral surface of the exchanger.

Since the heat exchange pipe is also wound around the outer peripheral surface of the combustion cylinder, the combustion cylinder forming the combustion chamber heated to a high temperature by the combustion heat is cooled by the circulation of hot water and the combustion The cylinder temperature can be greatly reduced, the heat resistance of the combustion cylinder material can be improved, and the influence of other radiation components on other components can be reduced. At the same time, the heat exchange is also performed in the high temperature combustion cylinder, so that the heat exchange efficiency can be improved.

According to a second aspect of the present invention, there is provided a burner motor provided with a pump for supplying fuel, a blower fan for supplying combustion air, and a furikiri fan for rotating and atomizing the fuel at a shaft tip. A vaporizing cylinder having a built-in heater for vaporizing the atomized fuel, a flame port mounted on the vaporizing cylinder and ejecting the vaporized gas, and a secondary air covering the periphery of the flame port and forming an upper peripheral wall. A combustion cylinder having a plurality of holes for supplying the combustion ring, a combustion cylinder that covers the periphery of the combustion ring, mixes the incomplete combustion gas of the combustion flame formed at the flame port with the secondary air, and completely burns the combustion gas. A heat exchanger mounted on the upper portion of the combustion cylinder and having a plurality of convex portions on the inner wall; and a resistance plate disposed at an inner portion of the heat exchanger so as to be an exhaust resistance of the combustion gas. The outer peripheral surface of the exchanger should be approximately Has a configuration that the hot water on the outer circumferential surface of the baked tube heat exchanger wound around the heat exchange pipe for heat exchange.

Further, complete combustion by the secondary air in the combustion chamber formed in the combustion cylinder and the flow of the combustion gas along the heat exchanger by the resistance plate can enhance the heat exchange efficiency. Furthermore, a heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder that forms the combustion chamber and comes into contact with the combustion flame, and the combustion cylinder heated to a high temperature by the combustion heat is cooled by circulating hot water to greatly increase the temperature of the combustion cylinder. In this case, the heat resistance of the combustion tube material is improved, and the influence of radiant heat on other components is reduced. At the same time, heat exchange of hot water is also performed in the combustion tube heated to a high temperature, so that the heat exchange efficiency is improved and the rising characteristics of the hot water are also greatly improved.

According to a third aspect of the present invention, the tip of the combustion cylinder is erected in a substantially vertical direction, the inner diameter thereof is made smaller than the outer diameter of the resistance cylinder, and the combustion cylinder is inserted into the inner part of the heat exchanger. ing.

The combustion flame is prevented from coming into direct contact with the lower end of the heat exchanger to ensure the heat resistance of the heat exchanger, and the flow rate of the combustion gas is suppressed so as to meander and flow out. The combustion gas is made to flow uniformly between a plurality of convex portions provided substantially uniformly on the wall surface. In addition, by raising the tip in a substantially vertical direction and making the inner diameter smaller than the outer diameter of the resistance tube, it is possible to prevent dust and combustion residues from downstream of the heat exchanger from dropping into the burner to prevent the tip from falling. Life is extended.

According to a fourth aspect of the present invention, the resistance tube has a cylindrical shape, and a shielding plate is provided at a lower end and a substantially central portion thereof.

[0013] Combustion gas concentrated at the center of the inner portion of the heat exchanger is shielded by a shielding plate provided at the lower end of the resistance tube,
By providing a uniform flow between a plurality of convex portions provided substantially uniformly on the inner wall surface of the heat exchanger to improve the heat exchange efficiency and providing a shielding plate at a substantially central portion, a space having a predetermined volume is provided at the upper end of the resistance tube. Section to secure the combustion noise generated in the burner section.

According to a fifth aspect of the present invention, in the heat exchange pipe, a metal fitting of the same material as the heat exchange pipe is brazed to a winding start portion on the outer peripheral surface of the combustion cylinder and a winding end portion on the outer peripheral surface of the heat exchanger. The mounting bracket provided at the winding start portion is mounted on the combustion tube, and the mounting bracket provided at the winding end portion is mounted on the heat exchanger, and the adjacent heat exchange pipes are brazed and fixed.

[0015] By reliably supporting the winding start and end portions of the heat exchange pipe, and by fixing between adjacent heat exchange pipes, heat stress and contraction noise and vibration noise at the time of applying pressure are prevented. ing.

According to a sixth aspect of the present invention, the heat exchange pipe is wound around the combustion cylinder and the heat exchanger outer peripheral surface while deforming the circular pipe into a flat shape such as an elliptical shape.

[0017] Then, by making the shape into a flat shape such as an elliptical shape, the contact area with the heat exchanger or the combustion tube is increased, the heat exchange efficiency is improved, and the cost is reduced by deforming and winding the circular pipe. I try to plan.

Further, according to the invention of claim 7, the heat exchange pipe is formed of a plate made of the same material so that the combustion tube winding side is the hot water inlet, the heat exchanger winding side is the outlet, and the heat exchange pipe is in contact with the heat exchange pipe outer peripheral surface on the outlet side. A metal fitting is brazed, and a temperature detector and a heating prevention device are mounted on the surface of the metal fitting.

By using the heat exchange pipe wound around the outer peripheral surface of the combustion cylinder heated to a high temperature as the inlet of the hot water,
The heat exchange of the hot water is carried out efficiently, and the rising of the hot water is accelerated, so that the usability is remarkably improved. In addition, by attaching a temperature detector and an overheat prevention device to the surface of the heat exchange pipe wrapped around the downstream surface of the heat exchanger via metal fittings, stable detection of the hot water temperature becomes possible, and optimal control of the hot water temperature is possible. .

In the invention according to claim 8, the heat exchange pipe has a hot water inlet on the side where the combustion tube is wound and an outlet on the side where the heat exchanger is wound, and the outlet side is connected to the hot water outlet side of the hot water joint through the hot water pipe. The inlet side is configured to supply hot water from the hot water return side via a hot water tank and a hot water circulating means.

[0021] By arranging the hot water to be directly conveyed from the outlet of the heat exchange pipe to the radiator, the blowing of warm air from the radiator can be expedited, and the usability is remarkably improved. Further, by disposing the hot water tank and the hot water circulation means on the hot water return side, the heat resistance can be reduced without receiving the thermal stress due to the hot water, and the cost can be reduced.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, the configuration of a hot water heating apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 21
Is a pump for supplying fuel, which is guided to a vaporization section by an oil feed pipe 22. Reference numeral 23 denotes a blower motor. A fan 24 for supplying combustion air to the motor shaft and a flirty fan 25 for rotating and atomizing the fuel supplied from the oil supply pipe 24 are attached to the tip. Numeral 26 denotes a vaporizing cylinder in which a heater is buried and heated to a predetermined temperature to vaporize the atomized fuel, mix it with combustion air, and blow it out from a flame port 27 disposed at an upper portion. The ejected vaporized gas is ignited by the ignition operation of the ignition device, and combustion starts. Reference numeral 28 denotes a combustion ring that covers the periphery of a flame opening 27 that forms a combustion flame, and is provided with a plurality of air holes 28a around its upper part for introducing secondary air. Numeral 29 denotes a combustion cylinder which mixes the secondary air supplied from the secondary air hole 28a with the incompletely combusted gas which could not be completely burned in the flame opening 27 and completely burns it. Reference numeral 29a stands upright in a substantially vertical direction at the end of the combustion cylinder, and is inserted into the internal portion of the heat exchanger 30. Reference numeral 30 denotes a heat exchanger, which is disposed above the combustion cylinder 29 and has a structure having a plurality of convex portions on an inner wall surface. The heat exchange is performed by passing a combustion gas through a gap between the convex portions on the inner wall surface. It has become. Reference numeral 31 denotes a resistance tube which is disposed at an appropriate position in the inside of the heat exchanger 30 and has shielding plates 31a and 31b at its lower end and substantially at the center for shielding the passage of combustion gas. The shield plate 31a of the first embodiment forms the exhaust resistance of the combustion gas, suppresses the flow velocity of the combustion gas from the burner, and allows the combustion gas to pass uniformly through the gap between the protrusions provided on the inner wall surface of the heat exchanger 30. I have to. The shielding plate 31b provided at the substantially central portion secures a space portion 31c having a predetermined volume above the resistance tube 31, and forms a silencing portion for reducing combustion noise generated in the burner portion. Reference numeral 32 denotes a heat exchange pipe, which starts to wind the outer peripheral surface of the combustion tube 29 and winds the entire outer peripheral surface of the heat exchanger 30 provided on substantially the same surface as the outer peripheral surface to perform heat exchange of hot water. I have to. 33
Is attached to the outer peripheral surface of the winding end of the heat exchange pipe 32 by brazing or the like using a temperature detector mounting bracket, and the temperature detector 34 and the overheat prevention device 35 are mounted on the surface. Further, when the heat exchange pipe 32 is wound around the outer peripheral surfaces of the combustion tube 29 and the heat exchanger 30, the heat exchange pipe 32 is forcibly formed into a flat shape such as an elliptical shape so as to increase the contact area with the outer peripheral surface. Reference numeral 36 denotes a hot water joint comprising a hot water outgoing side 36a and a hot water returning side 36b, and a hot water outgoing side 36a.
Is directly connected to the outlet of the heat exchange pipe 32 via a hot water pipe 37 so as to transfer the heat exchanged hot water directly to a radiator (not shown) installed in the room. Further, the hot water return side 36b is connected to the inlet side of the heat exchange pipe 32 via the hot water tank 38 and the hot water circulation means 39.

In the drawing, black arrows indicate the flow of combustion exhaust gas, and white arrows indicate the flow of hot water.

Next, the operation of the thus configured hot water heating apparatus will be described. When an operation signal is input, an operation signal is sent to each load based on a preset sequence from a control unit (not shown). First, a heater (not shown) embedded in the vaporizing cylinder 26 is energized to heat the vaporizing cylinder 26 to a predetermined temperature. When a predetermined temperature is reached, the blower motor 23
And the fuel pump 21 supplies combustion air and fuel. The supplied fuel is rotated and atomized by a blower fan 25 attached to the tip of a blower motor 23 and is vaporized.
Sprayed on the inner wall of Here, the fuel is vaporized and mixed with primary air, which is combustion air, and is ejected from a flame port portion 27 having a plurality of flame ports disposed above the vaporizing cylinder 26.
The ejected vaporized gas is ignited by an ignition operation, and the flame port 2
A flame is formed near 7 and combustion starts. Further, the combustion in the vicinity of the flame port 27 is determined by the mixing ratio with the primary air supplied from the central portion of the vaporizing cylinder 26. However, in the burner of the type for forcibly supplying the combustion air as in the present invention, It is difficult to perform complete combustion only with primary air. Therefore, a hole 28a for taking in secondary air is provided above the flame opening 27, and secondary air is introduced to complete combustion in the combustion cylinder 29. I am trying to do it. Therefore, due to the burner configuration, the inside of the combustion cylinder 29 becomes a combustion required space,
The combustion cylinder 29 is heated to a high temperature. A structure that prevents thermal effects on other components was also required. Therefore, in the present invention, the heat exchange pipe 32 is wound around the outer peripheral surface of the combustion cylinder 29 to form a part of the heat exchanger 32 so as to reduce the shape surface and the thermal influence.

Since the combustion gas generated in the combustion tube 29 is narrowed at the front end portion 29a of the combustion tube, the flow velocity is reduced at this portion, and the combustion gas meanders into the inside of the heat exchanger 30. A resistance tube 31 is disposed at an appropriate position in an inner portion of the heat exchanger 30, and a shielding plate 31a is provided at a lower end thereof so as to block the passage of the combustion gas. 3
0 through the gap between the protrusions provided on the inner wall of the exhaust pipe 4
It is discharged from 0.

A shield plate 31b is provided substantially at the center of the resistance tube 31, a space 31c having a predetermined volume is provided above the resistance tube 31, and an enlarged portion is provided in the middle of the combustion gas exhaust path. By providing a silencing effect, a noise reduction effect is provided to reduce the combustion noise, and in a case where a condition such that the oscillating combustion occurs in the burner portion is suppressed, the expansion portion provided in the exhaust path is used to suppress the combustion noise. ing. Further, the combustion cylinder tip portion 29a is erected in a substantially vertical direction and has an inner diameter d1.
Is smaller than the outer diameter d2 of the resistance tube 31, the scale adhering to the inner wall surface of the heat exchanger 30 and the like accumulates on the upright portion and does not fall into the combustion portion, so that the life of the burner can be extended.

In the above combustion operation, the combustion cylinder 2
9 and a heat exchange pipe 3 wound around the outer peripheral surface of the heat exchanger 30
By circulating hot water in 2, secure high-temperature hot water,
The hot water is conveyed from the outlet of the heat exchange pipe 32 to the radiator installed in the room through the hot water outlet side joint 36a to provide a hot water heating device with a quick rise. In addition, by setting the outer peripheral surface of the combustion tube 29 heated to a high temperature to start winding the heat exchange pipe 32, the rising of the hot water is sped up and the cooling effect of the combustion tube 29 is increased. Further, the heat exchange pipe 32 is fixed to the combustion cylinder 29 and the heat exchanger 30 by attaching a fitting of the same material to a proper position at a winding start portion and a winding end portion. By attaching and fixing, the strength is ensured, and the shrinkage sound due to thermal shock and the vibration sound when pressure is applied are suppressed.

[0029]

As described above, according to the first aspect of the present invention, a heat exchange pipe is wound around the outer peripheral surface of a combustion cylinder which forms a combustion chamber and is in contact with a combustion flame and is heated to a high temperature by combustion heat. The combustion cylinder thus cooled is cooled by circulating hot water to greatly reduce the temperature of the combustion cylinder, thereby improving the heat resistance of the combustion cylinder material and reducing the influence of radiant heat on other components. At the same time, heat exchange of the hot water is also performed in the combustion tube heated to a high temperature, so that the heat exchange efficiency is improved and the rising characteristics of the hot water can be greatly improved.

According to the second aspect of the present invention, complete combustion by the secondary air is performed in the combustion chamber formed in the combustion cylinder, and the flow of the combustion gas along the heat exchanger is formed by the resistance plate to perform heat exchange. Rate can be increased. Furthermore, a heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder where the combustion chamber is formed and the combustion flame contacts, and the combustion cylinder heated to a high temperature by the combustion heat is cooled by circulating hot water to greatly reduce the temperature of the combustion cylinder. By reducing the temperature, the heat resistance of the combustion tube material is improved, and the influence of radiant heat on other components is reduced.
At the same time, heat exchange of hot water is also performed in the combustion tube heated to a high temperature, so that the heat exchange efficiency is improved and the rising characteristics of the hot water are also greatly improved.

According to the third aspect of the present invention, the combustion flame is prevented from directly contacting the lower end portion of the heat exchanger to secure the heat resistance of the heat exchanger, and the meandering is performed by suppressing the flow rate of the combustion gas. As a result, the combustion gas flows uniformly between a plurality of convex portions provided substantially uniformly on the inner wall surface of the heat exchanger. Also, by raising the tip in a substantially vertical direction and making the inner diameter smaller than the outer diameter of the resistance tube, dust and combustion residues from downstream of the heat exchanger can be prevented from falling to the burner. Life can be extended.

According to the fourth aspect of the present invention, the shielding plate provided at the lower end of the resistance tube shields the combustion gas concentrated at the center of the inner portion of the heat exchanger, so that it is substantially uniform on the inner wall surface of the heat exchanger. The heat exchange efficiency is improved by uniformly flowing between the plurality of protrusions provided, and a shield plate is provided at the approximate center to secure a space with a predetermined volume at the upper end of the resistance tube and generate at the burner. It can absorb the burning noise.

According to the fifth aspect of the present invention, the start and end portions of the heat exchange pipe are securely supported, and the heat exchange pipes are fixed between adjacent heat exchange pipes, so that the heat exchange pipe can be contracted when heat stress or pressure is applied. Sound and vibration noise can be prevented.

According to the sixth aspect of the present invention, a flat shape such as an elliptical shape increases a contact area with a heat exchanger or a combustion tube, thereby improving heat exchange efficiency and forming a circular pipe. The cost can be reduced by winding while deforming.

According to the seventh aspect of the present invention, the heat exchange pipe wound around the outer peripheral surface of the combustion tube heated to a high temperature is used as the inlet of the hot water, so that the hot water can be efficiently exchanged with the hot water. And the usability is remarkably improved. In addition, by attaching a temperature detector and an overheat prevention device to the surface of the heat exchange pipe wrapped around the downstream surface of the heat exchanger via metal fittings, stable detection of the hot water temperature becomes possible, and optimal control of the hot water temperature is possible. .

According to the eighth aspect of the present invention, since the hot water is directly conveyed from the outlet of the heat exchange pipe to the radiator, the blowing of the warm air from the radiator can be expedited, and the usability is improved. This is a significant improvement. Further, by disposing the hot water tank and the hot water circulation means on the hot water return side, the heat resistance can be reduced without receiving the thermal stress due to the hot water, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hot water heating device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a heat exchange pipe section of the hot water heating apparatus.

FIG. 3 is a configuration diagram of a conventional hot water heating device.

FIG. 4 is a configuration diagram of a conventional hot water heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Pump 23 Burner motor 24 Blower fan 25 Fluffy fan 26 Vaporization cylinder 27 Flame port 28 Combustion ring 29 Combustion cylinder 30 Heat exchanger 31 Resistance cylinder 32 Heat exchange pipe 34 Temperature detector 35 Heat prevention device 36 Hot water joint 38 Hot water tank 39 Hot water Circulation means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Murakami 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. A flame port for mixing vaporized fuel with combustion air for combustion, a heat exchanger for exchanging heat of combustion gas generated in the flame port, and a heat exchanger through the heat exchanger. A hot water heat exchanger for heating hot water by heating the hot water to the outer peripheral surface of the heat exchanger, including the outer peripheral surface of a combustion cylinder with which a combustion flame contacts at the flame opening. Hot water heating system with a heat exchange pipe wound around it. 2. A burner motor having a pump for supplying fuel, a blower fan for supplying air for combustion, and a fan mounted at a tip end of the shaft for rotating and atomizing the fuel, and vaporizing the atomized fuel. A vaporizing cylinder having a built-in heater, a flame port mounted on the vaporizing cylinder and ejecting the vaporized gas, and a plurality of holes covering the periphery of the flame port and supplying secondary air to the upper peripheral wall. A combustion ring having a combustion ring that covers the periphery of the combustion ring, mixes incomplete combustion gas of a combustion flame formed at the flame opening with the secondary air and completely burns the combustion ring, and is mounted on the upper portion of the combustion cylinder. A heat exchanger having a plurality of convex portions on an inner wall, and a resistance tube disposed in an inner portion of the heat exchanger so as to be an exhaust resistance of the combustion gas, and the outer peripheral surfaces of the combustion tube and the heat exchanger are substantially formed. On the same plane, the outer peripheral surface of this combustion cylinder and heat exchanger 2. The hot water heating apparatus according to claim 1, wherein a heat exchange pipe for exchanging heat with hot water is wound around the heat exchanger. 3. The combustion cylinder according to claim 1, wherein the combustion cylinder has a tip portion standing upright in a substantially vertical direction, an inner diameter of the combustion cylinder is smaller than an outer diameter of the resistance cylinder, and the combustion cylinder is inserted into an inner portion of the heat exchanger. Hot water heating system. 4. The hot water heating apparatus according to claim 1, wherein the resistance tube has a cylindrical shape, and a shielding plate is provided at a lower end and a substantially central portion thereof. 5. The heat exchange pipe is formed by brazing an attachment made of the same material as the heat exchange pipe to the winding start portion on the outer peripheral surface of the combustion cylinder and the winding end portion on the outer peripheral surface of the heat exchanger, and provided at the winding start portion. The mounting bracket is attached to a combustion tube, and the mounting bracket provided at the end of the winding is attached to a heat exchanger, and is fixed by brazing between adjacent heat exchange pipes.
Or the hot water heating apparatus according to 2. 6. The hot water heating system according to claim 1, wherein the heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder and the heat exchanger while deforming the circular pipe into a flat shape such as an elliptical shape. apparatus. 7. The heat exchange pipe is formed by brazing a plate-like metal fitting of the same material so that the combustion tube winding side is the hot water inlet and the heat exchanger winding side is the outlet. The hot water heating apparatus according to any one of claims 1 to 5, wherein a temperature detector and a heating prevention device are attached to the surface of the fitting. 8. The heat exchange pipe has a combustion tube winding side as a hot water inlet and a heat exchanger winding side as an outlet, and the outlet side is connected to a hot water outgoing side of a hot water joint through a hot water pipe and directly conveyed to a radiator. 7. The hot water heating apparatus according to claim 1, wherein the inlet side supplies hot water from the hot water return side via a hot water tank and hot water circulating means.