JPS59112146A - Hot-water boiler - Google Patents

Abstract

PURPOSE:To maintain a shell wall of a combustion chamber at a relatively high temperature, prevent dusts, tar or the like from being adhered to the shell wall and enhance heat-exchanging efficiency, by a method wherein a gap is provided between an outer shell body provided with a hot water supplying pipe and an inner shell body provided with a water-supplying pipe, and a flow-controlling cylinder is provided at the gap. CONSTITUTION:An inner shell body 3 is concentrically provided in a flue 2 provided in the interior of an outer shell body 1, and the flow-controlling cylinder 5 is provided at the gap formed between the shell bodies 1, 3. Combustion air is supplied into a combustion chamber 15 through the flame holes 18 of an inner cylinder 19, while a fuel is pressure-sprayed into the chamber 15 through a nozzle 16, is mixed with combustion air, and is burned at an upper part of the chamber 15. The resultant high-temperature combustion gas flow upward through the flue 2, passes through an upper gap 8 while being restricted by the flow-controlling cylinder 5, flows downward through an inner gap 7, flows into an outer gap 6 through a communicating hole 9 provided at the lower part of the cylinder 5, and is discharged to the exterior of the heater through an exhaust cylinder 11. Accordingly, the combustion gas is subjected to heat exchange three times at the inside wall of the inner shell body 3, at the outside wall of the iner shell body 3 and at the inside wall of the outer shell body 1, whereby the shell wall faced to the combustion chamber 15 is maintained at a relatively high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water boiler using a heat exchanger with high heat exchange efficiency and high reliability.

Structure of conventional example and its problems As a conventional example, Japanese Utility Model Publication No. 36-24980, Japanese Patent Publication No. 5
No. 2-40466 discloses that both have a pipe-shaped flow path formed in the inner cylinder, but since the inner cylinder is overheated by high-temperature exhaust gas, corrosion is severe and accidents involving breakage have also occurred.

In addition, regarding Japanese Patent Publication No. 40-9155, a water supply pipe is connected to the bottom of the can, and the can wall around the combustion chamber is at a low temperature almost equal to the temperature of the water supply, so unreacted gas from combustion is cooled by the can wall. Then, tar and soot were attached to the inner wall of the can.

OBJECTS OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional examples and provide a hot water boiler having a highly reliable heat exchanger.

SUMMARY OF THE INVENTION In order to achieve such an object, the present invention provides an inner can body having a water supply pipe at the upper part concentrically in a flue consisting of an outer can body having a hot water outlet pipe at the upper part, and at the same time Both can bodies are connected at the middle part of the body and the lower part of the inner can body, and there is a gap between the outer and inner can bodies, between the inner and outer sides and the upper part of the inner can body, and there is an inner and outer gap at the lower part. An inverted U-shaped flow control tube is installed to communicate the
By placing a top plate with an exhaust port with a gap above the flow control tube and at the same time installing a combustion device in the flue at the bottom of the inner can, a highly reliable heat exchanger with excellent thermal efficiency can be created. That's what you get.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
3 is an inner can body provided inside the flue 2 concentrically with the outer can body 1, and both can bodies have a middle part of the outer can body 1 and a lower part of the inner can body 3. We are contacting you at 4.

5 is provided between the outer can body 1 and the inner can body 3, and an outer gap 6.5 is provided between the outer can body 1 and the inner can body 3. An inner gap 7 between the inner can body 3 and the inner can body 3. It is an inverted U-shaped flow control tube having a main gap 8 between the upper end of the inner can body 3 and a communication hole 9 connecting the inner gap 7 and the outer gap 6 at the lower part. 1o is a top plate having an exhaust port 11 provided at the top of the outer can body 1;
12 and 13 are a water supply pipe and a hot water outlet pipe connected to the inner can body 3 and the outer can body 1, respectively. 14 is a burner installed in the combustion chamber 15 at the bottom of the flue 2, which includes a fuel injection nozzle 16, a blower 17, a middle cylinder 19 having a flame hole 18, and an auxiliary combustion cylinder 20 for evaporating fuel.
It consists of %.

Next, to explain the present invention in detail, the combustion air is supplied to the blower 1.
7 and is supplied into the combustion chamber 15 from the flame hole 18 of the middle cylinder 19. On the other hand, fuel is sprayed under pressure into the combustion chamber 15 from the nozzle 16, but when ignited in an appropriate manner, the sprayed fuel oil mixes with combustion air and burns in the upper part of the combustion chamber 15. The high-temperature combustion exhaust gas generated in this way first rises through the flue 2, is regulated by the flow restriction tube 6, passes through the main gap 8, descends through the inner gap 7, and flows through the communication hole at the bottom of the flow restriction tube 5. 9, enters the external gap 6, rises, and is discharged from the exhaust pipe 11 to the outside of the machine. As described above, the combustion exhaust gas flows through the path 9, but first, as it ascends through the flue 2, it reaches the inner can body 3.
Heat exchange is performed with the inner wall (pass), with the outer wall of the inner can body 3 (2 passes) when descending through the inner gap, and with the inner wall of the outer can body 1 (3 passes) when rising through the outer gap 6. A total of 3 times (1
(round trip and half) heat exchange will be performed.

On the other hand, water is supplied through the water supply pipe 12, so it first descends through the inner can body 3, enters the outer can body 1 through the connection part 4, and fills the lower part of the water, and then rises to the outlet pipe 13. ) Hot water is supplied to the outer can body 1, but since the hot water that has been preheated in the inner can body 3 is completely supplied to the outer can body 1, the can wall facing the combustion chamber 15 is kept at a relatively high temperature, so that unreacted gas due to combustion is kept at a relatively high temperature. Since there is no cooling by the can walls, there is no possibility of soot, tar, etc. adhering to the can walls.

Further, since the area around the combustion chamber 15 is always surrounded by the can body, there is no overheated part, so damage accidents due to corrosion or the like can be prevented.

Effect of the invention 1 The reliability of the heat exchanger is improved.

The can wall facing the combustion chamber is always kept at a relatively higher temperature than the feed water temperature by the low-temperature water preheated by the inner can body, which reduces the adhesion of soot, tar, etc. and also prevents abnormal heating. Since this can be prevented, a highly reliable heat exchanger can be obtained.

2. High heat exchange efficiency can be obtained.

The flow of the combustion exhaust gas is regulated by the flow restrictor, and the heat exchange efficiency is increased by performing heat exchange a total of three times with the inner wall of the inner can body, the outer wall, and the inner wall of the outer can body.

[Brief explanation of drawings]

The figure is a sectional view showing the overall configuration of the present invention. 1... Outer can body, 2... Flue, 3...
...Inner can body, 5...Flow control tube, 6...Outer gap, 7...Inner gap, 8...Main gap,
9... Communication hole, 10... Top plate, 11.
...Exhaust port, 12...Water supply pipe, 13...
... Hot water pipe, 14 ... Combustion device.

Claims (1)

[Claims] Inside the flue, which is made up of an outer can body with a hot water outlet pipe at the top,
An inner can with a water supply pipe on the upper part is provided concentrically, and at the same time, both cans are connected at the middle part of the outer can and the lower part of the inner can. An inverted U-shaped flow control tube is provided with a gap between the flow control tube and the inner and outer gaps communicating with each other at the lower part, and a top plate having an exhaust port is placed on the upper part of the flow control tube with a gap. , a hot water boiler with a combustion device installed in the flue at the bottom of the inner can body. 1