JP3120738B2 - Hot water boiler for heating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum hot water boiler for heating, and more particularly to a structure of a heat exchanger portion thereof.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view showing a hot water boiler of a conventional hot water heating apparatus disclosed in Japanese Patent Application Laid-Open No. 1-134126.
Is a combustion chamber attached to the upper part of the burner head, 3 is a preheating water pipe wound around the outer peripheral surface of the combustion chamber 2, 4 is a plurality of heat receiving fins, and 5 is a communication with the preheating water pipe 3. A heat exchange pipe section 6 closely fixed to the heat receiving fins 4, 6 a hot water heat exchanger composed of the heat receiving fins 4 and the heat exchange pipe section 5, 7 an upper lid, 8 an exhaust pipe provided in the upper lid 7, 9 is a return port and 10 is a hot water outlet.

Next, the operation will be described. By the combustion gas generated in the combustion burner unit 1, low-temperature water entering from the return port 9 is first preheated by the preheating water pipe 3 by heat conduction from the wall of the combustion chamber 2, and then passes through the heat exchange pipe section 5. The heat received by the heat receiving fins 4
The preheated water passing through the inside of the pipe is heated to a high temperature, and supplied to the heating location from the hot water outlet 10. The combustion gas after the heat exchange is discharged from an exhaust pipe 8 provided in the upper lid 7.

[0004]

Since the heat exchanger of the conventional hot water heating system is constructed as described above, the preheating water pipe 3 extends from the wall of the combustion chamber 2 and the heat exchange pipe section extends from the heat receiving fin 4. 5 must rely on the heat exchange effect by heat conduction in the plate thickness plane, and the material of the wall constituting the combustion chamber 2 is an expensive copper plate with excellent heat conduction, a preheating water pipe 3 and a heat exchange pipe. The part 5 uses a copper tube, brazes the wall of the combustion chamber 2 to reduce the thermal contact resistance, and performs a lead hot-dip plating process to prevent corrosion caused by dew condensation of the combustion gas. However, there is a problem that the manufacturing process is extremely complicated and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a simple manufacturing process and good productivity. In addition, a low-cost material can realize sufficient quality and high performance. The purpose is to obtain a compact and compact heating hot water boiler.

[0006]

A heating hot water boiler according to the present invention comprises a combustion burner unit, an inner cylinder forming a combustion chamber above the combustion burner unit, and a small gap formed by the outer periphery of the inner cylinder. A hollow cylindrical first heat exchanger comprising an outer cylinder that surrounds and forms a water wall layer between the inner cylinder and the outer cylinder;
A second heat exchanger having a cylindrical shape provided at an upper portion inside the first heat exchanger; and a top plate covering the upper portions of the first and second heat exchangers. A second heat exchanger is disposed with a gap provided between the entire upper inner periphery of the first heat exchanger and the top plate to form an exhaust gas passage, and the first and second heat exchangers are arranged. Heat exchangers are connected in series.

Further, the first heat exchanger and the second heat exchanger are formed of a ferritic corrosion-resistant stainless steel plate.

[0008] The water wall layer of the first heat exchanger is vertically divided into a plurality of layers by annular ribs formed in the inner cylinder or the outer cylinder, and a part of an adjacent water wall layer is formed. Are alternately connected.

The water wall layer of the first heat exchanger is vertically divided into a plurality of layers by annular ribs formed in the inner cylinder, and adjacent water wall layers are separated by the annular ribs. These are connected to each other by a recess formed in a part thereof.

[0010] Furthermore, a cylindrical red heat radiator smaller than the diameter of the burner unit is provided substantially at the center of the first heat exchanger and the second heat exchanger.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of a heating hot water boiler according to the present invention will be described with reference to the drawings. In FIG. 1, 1 is a combustion burner unit, 1a is a head portion of the burner unit, and 1b is a flame holding guide. 11
Is an inner cylinder surrounding the head portion 1a of the burner unit 1 and forming a combustion chamber 2 at an upper portion thereof. 11a is an annular rib formed at a predetermined interval on the outer peripheral surface of the inner cylinder 11 so as to protrude outward. , 12 are outer cylinders which surround the outer circumference of the inner cylinder 11 at a small interval, and are joined at upper and lower ends to the inner cylinder 11 in a watertight manner by welding or the like. It has a projection 12a formed by projecting a part facing the rib 11a outward.

Numeral 13 denotes a water wall layer formed between the inner cylinder 11 and the outer cylinder 12. The water wall layer is vertically divided into a plurality of layers by an annular rib 11a of the inner cylinder 11. The gap formed by the projections 12a of the outer cylinder 12 allows the upper and lower water wall layers 13 that are partially adjacent to each other to be alternately communicated.

Reference numeral 9 denotes a return port provided at a lower portion of the outer cylinder 12;
Is a communication port provided in the upper part of the outer cylinder 12, and 15 is a first heat exchanger having a hollow cylindrical shape constituted by these. Numeral 16 denotes a second heat exchanger having an eccentric cylindrical shape disposed on the upper side inside the first heat exchanger 15, and the second heat exchanger is provided on one side with the first heat exchanger. 15 connection ports 14 and connection pipe 1
A communication port 18 communicated with 7 and a hot water outlet 10 are provided on the opposite side.

Reference numeral 19 denotes an exhaust gas passage comprising a small gap formed between the inner wall of the first heat exchanger 15 and the outer wall of the second heat exchanger 16, and 20 denotes an upper opening of the first heat exchanger 15. It is a top plate to cover and has an exhaust port 21. Reference numeral 22 denotes an exhaust gas path formed between the top plate 20 and the upper surface of the second heat exchanger 16, and 23 denotes an upper end fixed to a concave portion 16a formed at the bottom of the second heat exchanger 16, and a lower end thereof. Head part 1a of burner unit 1
It is a cylindrical red-hot radiator that is disposed in the vicinity and has a diameter slightly smaller than the diameter of the head portion 1a of the burner unit 1. The lower end opening is closed by a cap 24. Reference numerals 25 and 26 denote combustion gas vents provided in the upper part and the central part of the red heat radiator 23 and slightly below. Then, the first heat exchanger 15 constituting the heat receiving section
The second heat exchanger 16 is made of a ferritic corrosion-resistant stainless steel plate.

Next, the operation of the configuration of the first embodiment will be described. First, the flow of warm water enters the first heat exchanger 15 through the return port 9 below the outer cylinder 12. The low-temperature water entering the first heat exchanger 15 hits the outer peripheral surface of the inner cylinder 11 and divides into two right and left sides, makes a half turn around the lowermost water wall layer 13, It merges and rises in a small gap formed between the annular rib 11a of the inner cylinder 11 and the projection 12a of the outer periphery 12 and moves to the water wall layer 13 one level higher. The warm water transferred to the upper water wall layer 13 hits the outer peripheral surface of the inner cylinder 11 and divides into two right and left again, and turns half a turn to merge at the protrusion 12a of the outer cylinder 12 formed on the opposite side, Then, it moves to the upper water wall layer 13. In this way, the above-described flow is repeated to reach the communication port 14 on the upper part of the outer cylinder 12, pass through the connection pipe 17, enter the second heat exchanger 16 from the communication port 18, and enter the radiator through the hot water inlet 10. (Not shown) to the circulation circuit.

On the other hand, the flame formed by the head portion 1a of the burner unit 1 rises along the outer surface of the red-hot radiator 23, and the high-temperature combustion gas having completed the combustion reaction is supplied to the inner wall surface of the inner cylinder 11 and the second combustion chamber. And the red heat radiator 23 is heated to 600 to 800 degrees and glows red to radiate radiant heat. As a result, the inner wall surface of the inner cylinder 11 and the bottom of the second heat exchanger 16 are further heated to further increase the amount of heat received. The combustion gas whose temperature has dropped due to these heat reception is discharged into a narrow exhaust gas passage 1
9 and 22, the upper portion of the first heat exchanger 15 and the side and upper surfaces of the second heat exchanger 16 are further heated, the combustion heat is effectively transmitted to the heat exchanger, and the top plate 20 is exhausted. It is discharged from the mouth 21.

As described above, a hollow cylindrical second heat exchanger 15 having a concave bottom at the upper inside of the hollow cylindrical first heat exchanger 15.
Since the heat exchanger 16 is disposed, heat can be effectively exchanged from high-temperature combustion gas to low-temperature combustion gas. Red heat radiator 23
By disposing in the center of the first and second heat exchangers 15 and 16, heat exchange is further reduced, and compactness becomes possible.

Further, since the conventional structure does not rely on heat conduction only on the thick surface of the wall of the combustion chamber, it has good corrosion resistance to water and exhaust gas, and is made of an inexpensive ferrite-based material having low heat conduction. Corrosion-resistant stainless steel plates can be used. Further, the inner cylinder 11 has an annular rib 11a that contacts the outer cylinder 12.
And the outer cylinder 1 facing this annular rib 11a.
By forming the protruding portion 12a in a part of the second protruding portion in the same direction as the annular rib portion 11a, a hot water flow path without stagnation is formed, local boiling can be prevented, and the annular rib 11a and the protruding portion are formed. 12a also has an effect of increasing the strength, and the material of the inner cylinder 11 and the outer cylinder 12 can be made thinner, so that the cost can be further reduced.

Embodiment 2 FIG. 4 shows a second embodiment of the present invention, in which an annular rib 11a provided on the inner cylinder 11 is formed to be inclined. With this configuration, the hot water flows along the slope of the rib 11a, and the flow of the hot water can be made smooth, so that the hot water flowing in the first heat exchanger 15 can be prevented from remaining more.

Embodiment 3 FIG. 5 shows a third embodiment of the present invention, in which an outer tube 12 is provided with an annular rib 12b protruding inward, and an inner tube 11 is provided with a projection 11b. Even with such a configuration, the same effect as that of the first embodiment can be obtained.

Embodiment 4 FIG. 6 and 7 show a fourth embodiment of the present invention. In the fourth embodiment, an inner rib 11 is provided with an annular rib 11a, and a part of the annular rib 11a is recessed. A plurality of portions 11c are formed at equal intervals. With this configuration, the same effects as those of the first and third embodiments can be obtained, and the outer cylinder 12
It is not necessary to form the projection 12a for
Workability is improved.

[0022]

As described above, according to the first aspect of the present invention, it is possible to provide a hot water boiler that can effectively receive heat from high-temperature combustion gas to low-temperature combustion gas, and is compact and has a high heat exchange rate.

According to the second aspect of the present invention, an inexpensive ferritic corrosion-resistant stainless steel sheet having low thermal conductivity can be used, and cost reduction can be realized.

According to the third aspect of the present invention, since a hot water flow path without stagnation is formed, local boiling can be prevented, and the strength of the first heat exchanger can be increased, so that the thickness of the material can be reduced. Thus, a low-cost, high-quality, high-performance heating hot water boiler can be provided.

According to the fourth aspect of the present invention, a hot water flow path without stagnation is formed, local boiling can be prevented, and the strength of the first heat exchanger can be increased, so that the material can be made thinner. In addition, since it is not necessary to form a protrusion or the like on the outer cylinder, a low-cost, high-quality, high-performance heating hot water boiler can be provided.

Further, according to the fifth aspect of the present invention, the radiant heat radiated from the red heat radiator further heats the bottoms of the first heat exchanger and the second heat exchanger, thereby further increasing the amount of heat received. be able to.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing Embodiment 1 of a heating hot water boiler according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a side sectional view showing Embodiment 2 of the heating hot water boiler according to the present invention.

FIG. 5 is a side sectional view showing Embodiment 3 of the present invention.

FIG. 6 is a side sectional view showing Embodiment 4 of the present invention.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a cross-sectional view showing a heat exchanger part of a conventional hot water heating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner unit 2 Combustion chamber 9 Return port 10 Hot water outlet 11 Inner cylinder 11a Annular rib 11b Projection part 11c Depressed part 12 Outer cylinder 12a Projection part 12b Annular rib 13 Water wall layer 14 Communication port 15 First heat exchanger 16 second heat exchanger 18 communication pipe 19 exhaust gas path 20 top plate 22 exhaust gas path 23 red heat radiator

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tadashi Usami 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (56) References Japanese Utility Model 57-54943 (JP, U) Japanese Utility Model Sho 55-43247 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F24H 1/24

Claims (5)

(57) [Claims] 1. A combustion burner unit, an inner cylinder forming a combustion chamber above the combustion burner unit, and an outer periphery of the inner cylinder surrounded by a small gap, and a water wall is interposed between the inner cylinder and the inner cylinder. A hollow cylindrical first heat exchanger composed of an outer cylinder forming a layer, and a heavenly cylindrical second heat exchanger provided at the upper inside of the first heat exchanger And the first and second
And a top plate for covering an upper part of the heat exchanger of the first aspect.
A second heat exchanger is disposed with a gap provided between the entire upper inner periphery of the heat exchanger and the top plate to form an exhaust gas path, and the first and second heat exchangers are connected in series. A hot water boiler for heating, wherein the boiler is connected to a heater. 2. The heating hot water boiler according to claim 1, wherein the first heat exchanger and the second heat exchanger are formed of a ferritic corrosion-resistant stainless steel plate. 3. The water wall layer of the first heat exchanger is vertically divided into a plurality of layers by annular ribs formed on an inner cylinder or an outer cylinder, and a part of an adjacent water wall layer is formed. The hot water boiler for heating according to claim 1, wherein the boilers are alternately connected with each other. 4. The water wall layer of the first heat exchanger is vertically divided into a plurality of layers by annular ribs formed in an inner cylinder, and adjacent water wall layers are separated by the annular ribs. The hot water boiler for heating according to claim 1, wherein the communication is made with a recess formed in a part thereof. 5. A cylindrical red heat radiator having a diameter smaller than a diameter of a burner unit is provided at a substantially central part of each of the first heat exchanger and the second heat exchanger. Hot water boiler for heating.