JPH025306Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot water boiler, and more specifically to an improvement of a hot water boiler using a spiral water tube wound in a cone shape.

[Conventional technology]

A hot water boiler with a cone-shaped spiral water tube placed horizontally inside the combustion chamber (Special Publication No. 52-38261)
has already been proposed by the applicant. In hot water boilers of this type, the spiral water pipes with both ends connected to the water chamber are cone-shaped, that is, the winding diameter on the water inlet side is large, and the winding diameter gradually becomes smaller as it reaches the hot water discharge side. The spiral water pipe is placed horizontally in the combustion chamber so as to surround the combustion flame of the burner, and by heating the spiral water pipe, forced circulation is generated from the large diameter part to the small diameter part. It is being

[Problem that the invention attempts to solve]

However, in hot water boilers that use such cone-shaped spiral water tubes, it is possible to obtain high-temperature hot water that is almost steam-like at the small-diameter side of the spiral water tube; In addition to the fact that sufficient heating power cannot be obtained on the side, there is a problem in that it takes a considerable amount of time for hot water to circulate inside the spiral water pipe from the large-diameter part to the small-diameter part. In other words, there is a problem in that the forced circulation effect of the spiral water pipe alone has a limit to its circulation speed, and a rapid circulating flow cannot be generated.

The present invention is an attempt to improve the above-mentioned problems, and the problem to be solved lies in making it possible to promote circulation within the spiral water pipe. That is, the present invention is characterized in that the above-mentioned problem is solved by attaching a heating pipe body to the small diameter side of the spiral water pipe to promote circulation. The means and effects are as follows.

[Means for solving the problem] A spiral water tube is formed by winding it in a cone shape so that the diameter gradually decreases from the base toward the tip, and the spiral water tube is placed above the burner and inserted into the combustion chamber. horizontally installed.

A heating tube body is formed by arranging a plurality of communicating tubes in parallel extending from the base toward the distal end and connecting the front and rear ends of the communicating tubes with a horizontal tube.

The above-mentioned heating tube is located below the spiral water tube and installed horizontally in the combustion chamber.The heating tube is arranged with a gentle upward slope from the base toward the tip, and The horizontal pipe on the side and the tip end on the small diameter side of the spiral water pipe are connected through a connecting pipe.

[Effect]

When the spiral water tube and the heating tube are heated, a part of the hot water heated in the spiral water tube enters the heating tube from the small diameter portion on the discharge side and is further heated to a higher temperature by the heating tube. The high-temperature hot water then returns to the small diameter part on the discharge side of the spiral water pipe and is discharged, but the hot water inside the spiral water pipe is drawn into the flow of high-temperature hot water and joins. Circulation within the spiral water pipe can be promoted.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings. In the drawings, 1 is a cylindrical outer cylinder with a lid, 2 is an inner cylinder with a lid and built in the outer cylinder 1, and a water chamber 3 is formed between the outer cylinder 1 and the inner cylinder 2. A combustion chamber 4 is formed at the lower end of the inner cylinder 2, while a smoke chamber 5 is formed at the upper part of the combustion chamber 4, that is, within the side wall of the inner cylinder 2. Further, a chimney 6 is provided at the top of the smoke chamber 5 so as to extend upward through the water chamber 3. A burner 7 is provided at the bottom of the combustion chamber 4 and faces upward, while a spiral water pipe 8 is placed horizontally above the burner 7.
The spiral water tube 8 is formed into a cone shape such that the winding diameter gradually becomes smaller from the base toward the tip. The lower end of a water conduit 10 which has an opening 10' in the upper part of the spiral water pipe 8 and communicates with the water chamber 3 is connected to the water conduit 10, while the tip of the spiral water pipe 8, that is, one end on the small diameter side is connected to the water conduit 10. Similarly to 10, the lower end of a hot water discharge pipe 11 communicating with the upper part of the water chamber 3 is connected. or,
The upper end opening 11' of the water discharge pipe 11 is the water conduit pipe 1.
The opening is located slightly above the opening 10' of 0, and there is a through hole 1 near the end of the pipe that facilitates drainage of the hot water.
A plurality of holes 2 are drilled. Further, on the small diameter side of the spiral water pipe 8, a bypass pipe 13 is provided in the last turn of the spiral water pipe 8 and rises along the diameter direction so as to communicate the bottom part and the top part of the pipe, while a bypass pipe 13 is provided in the lower part of the spiral water pipe 8. A heating pipe body 14 is installed horizontally. The heating tube body 14 has two horizontal tubes 15a, 15b provided facing each other at both front and rear ends thereof, and a plurality of communicating tubes 16 horizontally extending at regular intervals between the two horizontal tubes 15a, 15b.
The communicating tubes 16a and 16b are provided with their distal ends inclined obliquely upward so as to have an appropriate upward slope. Further, among the plurality of communication pipes 16a, 16b that are horizontally spanned between both horizontal pipes 15a, 15b in this way, any communication pipe 16a is provided so that its front and rear ends communicate with both horizontal pipes 15a, 15b, respectively. The other communication pipe 16b has its rear end communicated with the horizontal pipe 15b on the rear end side, and its front end communicates with the horizontal pipe 15a on the front end side through a throttle hole 17 formed to have a diameter smaller than the inner diameter of the communication pipe 16b. It is installed so that it communicates with the. The heating tube body 14 is provided so that a horizontal tube 15a on the front end side thereof is communicated with the small diameter portion of the spiral water tube 8 through two connecting tubes 18.

On the other hand, in the smoke chamber 5, a plurality of heat absorption pipes 19 are installed horizontally in a row at regular intervals in a plurality of stages in the vertical direction. Each of the heat absorbing tubes 19 is provided with its tip inclined diagonally upward so as to have an appropriate upward distribution, and its rear end is opened and communicated with the water chamber 3, respectively. Also, among the heat absorption tubes 19 arranged in multiple stages in this way, the tip of the heat absorption tube 19 located at the top is closed, while the tip of the heat absorption tube 19 located at the bottom is formed with a small diameter throttle hole. It is provided so as to communicate with the water chamber 3 via 19'. In addition, in the drawing, 20 indicates a water supply pipe connected from the outside into the water chamber 3, and 21 indicates a hot water supply port provided at the upper part of the water chamber 3.

Next, its effect will be explained.

When the burner 7 is ignited while the water chamber 3 is filled with water, the heating conductor 1 is heated by the combustion flame.
4 and the spiral water tube 8 are heated, respectively. The water introduced into the spiral water pipe 8 from the water chamber 3 via the water conduit 10 is heated in sequence as the spiral water pipe 8 is heated, and becomes hot water. and is sent to the small diameter side. A part of the hot water thus sent to the small-diameter side flows into the heating tube body 14 through the connecting tube 18, and each of the communicating tubes 16a, 16b of the heating tube body 14
The hot water flowing into the heating tube body 14 is further heated by being heated by the combustion flame of the burner 7 as described above. Also, at this time, since a small-diameter throttle hole 17 is formed at the front end of any one of the communicating tubes 16a and 16b provided in the ascending public distribution, the communicating tube is The amount of circulation in the communication pipe 16b is limited, and the communication pipe 16b
As the residence time of the hot water inside becomes longer, the hot water is heated to a higher temperature. The hot water heated to a high temperature in this way returns to the small-diameter portion of the spiral water pipe 8 via the connecting pipe 18, and is heated through the convection action, that is, the action in which the heated water reduces its density and rises. The water is diverted through the small-diameter portion and the bypass pipe 13 and enters the discharge pipe 11, but at this time, as described above, it is sent to the small-diameter side through the forced circulation action of the spiral water pipe 8. By drawing the hot water into the flow of hot water heated to a higher temperature by the heating pipe body 14 and merging with it, the hot water is smoothly circulated within the spiral water pipe 8. And like this, the spiral water pipe 8 and the heating pipe body 1
4 is discharged into the water chamber 3 through the hot water discharge pipe 11, and has the effect of increasing the water temperature in the water chamber 3. Moreover, the hot water in the water chamber 3 heated in this manner is sucked in again through the water guide pipe 10 through the forced circulation action acting on the spiral water pipe 8, and the temperature raising action as described above is repeated.

On the other hand, the combustion flame that heated the heating tube body 14 and the spiral water tube 8 becomes hot air that rises through the smoke chamber 5 and is discharged to the outside through the chimney 6. At the same time, the water chamber 3 is heated from the inside, further raising the water temperature in the water chamber 3, and at the same time, the heat absorption pipes 19 provided in multiple stages in the smoke chamber 5 are heated by the hot air, respectively. Heat absorption pipe 19...
This has the effect of increasing the temperature of the water inside. Among the heat-absorbing pipes 19, the heat-absorbing pipe 19 located below
The heated water inside is released into the water chamber 3 from the tip side of the heat absorption pipes 19.
Since a small-diameter throttle hole 19' is provided at the tip of the tube, the amount of hot water discharged through the throttle hole 19' is restricted, and this allows the hot water to flow inside the heat absorption tube 19 without impairing the flow of hot water. The residence time of the hot water in the tank becomes longer, and the temperature increases accordingly.

In addition, the amount of heat of the hot air that heats the heat absorption pipes 19 gradually decreases as it reaches the upper part. Since the end of the heat absorbing tube 19 is closed, its residence time is further extended, and an effective temperature raising effect can be obtained despite the small amount of heat.

[Effect of idea]

The present invention is constructed as described above.
As mentioned above, a heating tube is formed by horizontal tubes installed facing each other at both front and rear ends, and a plurality of communicating tubes installed horizontally between both horizontal tubes, and the heating tube is shaped like a cone. The hot water that is sent to the small diameter side through the forced circulation of the spiral water pipe is connected to the small diameter part on the discharge side of the spiral water pipe formed in the pipe, and the hot water that is sent to the small diameter part through the forced circulation of the spiral water pipe is converted into a flow of high temperature hot water obtained by the heating pipe body. By drawing it in, it became possible to increase the circulation speed of hot water in the spiral water pipe, and through the circulation promotion effect, it became possible to significantly improve the heating capacity. As a result, it has become possible to raise the temperature of the water in the water chamber in a short time and save fuel accordingly, making it possible to obtain a boiler with higher thermal efficiency.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a hot water boiler according to the present invention, FIG. 2 is an enlarged plan view of a heating tube, and FIG. 3 is a sectional view taken along line A--A in FIG. 1. 1...Outer cylinder, 2...Inner cylinder, 3...Water chamber, 4...
Combustion chamber, 5...Smoke chamber, 6...Chimney, 7...Burner, 8...Spiral water pipe, 10...Water pipe, 10'...
...opening, 11...exhaust pipe, 11'...opening,
12...Through hole, 13...Bypass pipe, 14...Heating pipe body, 15a, 15b...Horizontal pipe, 16a, 1
6b... Communication pipe, 17... Throttle hole, 18... Connecting pipe, 19... Endothermic tube, 19'... Throttle hole, 20...
...Water supply pipe, 21...Hot water inlet.

Claims (1)

[Scope of utility model registration request] A spiral water tube formed in a cone shape with a diameter gradually decreasing from the base toward the tip is located above the burner and installed horizontally in the combustion chamber, while it is arranged in parallel so as to extend from the base toward the tip. A heating pipe body is formed by a plurality of communicating pipes and a pair of front and rear horizontal pipes connecting the front and rear ends of the communicating pipes, and the heating pipe body is placed below the spiral water pipe from the base to the tip. In addition to installing horizontally so that it slopes upward in the direction,
A hot water boiler in which the horizontal pipe on the tip side and the small diameter part of the spiral water pipe are connected through a connecting pipe.