JPS591158Y2 - hot water boiler - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a hot water boiler.

Conventionally, in order to improve the thermal efficiency of hot water boilers, various methods have been used to increase the overall heat transfer coefficient, particularly the gas side membrane heat transfer coefficient, but these methods are still insufficient.

In order to greatly increase the gas side film heat transfer coefficient, the present invention generates small vortices of the combustion gas in multiple stages along the flow direction of the combustion gas, thereby effectively utilizing the turbulent stirring characteristics of the vortex. The purpose is to improve the thermal efficiency of hot water boilers by using

That is, the gist of the present invention is that an ice chamber is formed between an outer cylinder and an inner cylinder, a combustion chamber is formed inside the inner cylinder, and inside the combustion chamber,
In a hot water boiler equipped with a baffle tube with a closed bottom, multiple stages of vortex generation plates are provided between the outer peripheral surface of the baffle tube and the inner surface of the inner tube, and the vortex generation plates have a large number of holes. The hot water boiler is characterized in that a guide plate is formed in the hole and is bent from the baffle side near the hole to cover the hole.

Next, the hot water boiler of the present invention will be explained with reference to the drawings.

In the hot water boiler 1, an outer cylinder 2 and an inner cylinder 3 are stacked concentrically, a water chamber 4 is formed between the outer cylinder 2 and the inner cylinder 3, and a combustion chamber 5 is formed inside the inner cylinder 3. A burner 6 is provided facing the combustion chamber 5, and is designed to heat the water in the water chamber 4.

A baffle tube 7 with a closed bottom 71 is provided on the upper side of the combustion chamber 5.

Reference numeral 8 denotes a vortex generation plate, in which an annular plate body 81 extends over the entire circumference of the baffle tube 7 and extends over the outer circumferential surface 72 of the baffle tube 7.
A plurality of stages are provided at regular intervals between the inner surface 31 of the inner cylinder 3 and the inner surface 31 of the inner cylinder 3.

The vortex generation plate 8 has an annular plate body 81 whose central portion is curved upward in a convex manner, and the inner circumferential edge 8 of the plate body 81
The outer circumferential edge 83 is connected to the outer circumferential surface 72 of the baffle tube 7 and the inner surface 31 of the inner tube 3 such that the outer circumferential edge 83 is located slightly above the baffle tube 2 .

It is easy to attach the annular plate 81 by fixing it to the outer circumferential surface 72 of the baffle tube 7.

It is preferable that the plate body 81 has an inclined curved surface as described above because the combustion gas is guided toward the inner cylinder 3 side.

A large number of holes 84 are bored in the plate body 81 of the vortex generating plate 8,
A bent guide plate 85 is erected from the side of the baffle tube 7 in the vicinity of the opening 84 of the plate body 81 so as to cover the opening 84 .

The opening 84 is located slightly closer to the inner surface 31 of the inner cylinder 3 than the center of the plate 81.
It is preferable to provide the inner cylinder 3 closer to the inner cylinder 3 so that the combustion gas can easily come into contact with the inner cylinder 3.

, 9 is the water supply 1'', 10 is the hot water outlet ``J'', and 11 is the exhaust port.

Thus, in the hot water boiler 1 according to the present invention, the combustion gas injected from the burner 6 and combusted in the combustion chamber 5 is introduced into the gap between the outer peripheral surface 72 of the baffle tube 7 and the inner surface 31 of the inner tube 3, and the combustion gas is injected from the burner 6 and burned in the combustion chamber 5. When the vortex generating plate 8 is opened (passes through L84 and is discharged from the exhaust port 11).

The combustion gas introduced into the gap between the outer circumferential surface 72 of the baffle tube 7 and the inner surface 31 of the inner tube 3 collides with the plate 81 of the vortex generation plate 8, is throttled, increases the gas velocity, and passes through the opening 84. Rise.

The combustion debris that has passed through the hole 84 during this time spreads on its back surface and generates a groove.

The combustion gas that has passed through the opening 84 hits the guide plate 85 and further generates a vortex while being directed toward the inner cylinder 3 by the guide plate 85 and violently collides with the inner surface 31 of the inner cylinder 3 to effectively exchange heat. Let's do it.

Then, the combustion gas further rises and hits the next vortex generating plate 8, where the same flow and heat exchange occur again, and by repeating this process, the water in the water chamber 4 is effectively heated.

Since the hot water boiler of the present invention has the above-mentioned configuration,
Combustion gas passing through the gap between the outer circumferential surface of the baffle cylinder and the inner surface of the inner cylinder is shaped into a vortex by passing through the opening in the vortex generation plate, and further becomes a vortex by the guide plate, and is directed toward the inner cylinder. The ice is directed and collides with the inner surface of the inner cylinder, greatly increasing the gas-side film heat transfer coefficient on the inner surface of the inner cylinder, and effectively exchanging heat with the water in the ice chamber between the inner cylinder and the outer cylinder. The hot water boiler itself can be made more compact, thereby reducing fuel consumption and making the hot water boiler itself more compact.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of the hot water boiler of the present invention;
The figure is a partially cutaway perspective view showing the vortex generating plate of the hot water boiler of the present invention. 2...Outer cylinder, 3...Inner cylinder, 31...
...Inner surface of inner cylinder, 4...Water chamber, 5...
・Combustion chamber, 7...Baffle cylinder, 72...
・Outer peripheral surface of baffle tube, 8... Eddy current generating plate, 8
4...Opening hole, 85...Guidance board.

Claims (1)

[Scope of utility model registration request] 1. In a hot water boiler in which an ice chamber is formed between an outer cylinder and an inner cylinder, a combustion chamber is formed inside the inner cylinder, and a baffle cylinder with a closed bottom is provided inside the combustion chamber, the outer periphery of the baffle cylinder is Multiple stages of vortex generation plates are provided between the surface and the inner surface of the inner cylinder, and the vortex generation plates are provided with a large number of holes,
A hot water boiler characterized in that a bent guide plate is erected from the baffle side near the opening so as to cover the opening. 2. The hot water boiler according to claim 1, wherein the vortex generating plate is fixed to the outer peripheral surface of the baffle tube. 3. The vortex generating plate is formed by having a large number of holes bored in an annular plate and a guide plate standing upright, and the outer circumferential edge of the plate is slightly higher than the inner circumferential edge of the plate. A hot water boiler according to claim 1 or 2 of the utility model registration claim. 4. The hot water boiler according to claim 3, wherein the center part of the annular plate of the vortex generating plate is curved upward in a convex shape.