JPS609567Y2 - soft head device - Google Patents

Description

[Detailed description of the invention] The present invention is designed to provide a cracked structure in the exhaust gas flue of a boiler that is thinner than the flue plate 2 and is intended to prevent damage to the flue during burner ignition or backfire. This paper relates to improvements to a plate (called a soft head) device.

In general, flues for boilers and the like vary in size from small to large depending on the size of the boiler, and are often made in a rectangular shape.

For this reason, even if a slight pressure is applied to the inside of the flue, it may bulge or make a clicking sound, so the board is made a little thicker, for example, about 3 to 6 meters.

On the other hand, when a burner is ignited or backfired, unburned gas may accumulate in the boiler or the flue, causing a gas explosion. In such cases, the flue not only swells but also bursts. It will cause great damage to the surrounding area.

As a countermeasure, conventionally, a lid plate with a weight attached to the flue has been installed, or an explosion door with a spring to press the lid has been installed, but with such methods, over time, the part of the flue explodes. Gas leaked out, making it difficult to drill large diameter holes, and the opening/closing joints and spring parts of the door were rusted and would not work in an emergency, making them unable to perform their functions satisfactorily.

In view of the above, the present invention eliminates these drawbacks and ensures that there is no gas leakage during normal conditions, and that when the internal pressure rises abnormally, the flue plate is replaced by a large diameter thin plate installed in the flue. The present invention was completed by not expanding, and by improving the surrounding structure to prevent noise caused by the membrane vibration of the soft head device. , a soft head board that is thinner than the flue board is attached to a seat provided on the flue board, and a soft head board support that is curved outward in a convex shape is provided on the lower side of the soft head board, and the upper part of the soft head board is A soft head device is provided in which a soft head plate is pressed by a flange through a backing, further fixed from the outermost side by a presser bar, and tightened with a stud bolt.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows a sectional view of an embodiment of the present invention, in which 1 is a boiler flue, 2 is a flue plate, and a soft head plate 5 is mounted on a seat 3.

4 is a flange that presses the soft head plate 5, 6 is a backing, 7 is a round bar that supports the soft head and is bent outward in a convex shape so as to push the soft head plate outward, and 8 is a flange that presses the soft head plate due to internal pressure. In practical use, it is preferable to attach a plurality of presser bars, for example 2 to 3, to prevent the pieces from breaking and scattering to the surroundings when pushed outward.

Numeral 9 is a stud bolt for tightening the soft head plate to the seat 3.

In this way, when abnormal pressure is applied to the flue, the flue plate 2 bulges out, or the soft head plate 5 sandwiched between the seat 3 and flange 4 bulges out before the corner welds are avoided, causing smoke to flow out. By releasing the explosive force or internal pressure caused by road gas,
Not only can damage to the flue be prevented, but in combination with the presence of the round bar 7 that supports the soft head plate located inside, it is possible to prevent the vibration membrane etc. from being caused by the soft head plate. Ta.

In addition to boilers, the soft head device of the present invention can be used in devices with burners such as vacuum evaporators, and flues through which flammable and explosive gases including unresolved gas and dust pass, in the same way as the exhaust gas flue of the boiler of the present invention. It can also be used as a soft head device where damage prevention is required.

Next, embodiments of the present invention are as follows.

When the flue pressure is normally less than several hundred water columns,
The soft head device of the flue is designed to blow off when the pressure inside the flue reaches 3000 to 5000 mm of water column, and to give an example of an actual case, the flue plate thickness is 3.277 El.
l! At the inside diameter of the flue plate hole 406wIL, the soft head plate thickness is 0.16mm and its diameter is 414mm.

When this soft head plate is attached to the flue plate of a boiler, if there is no support 7 for the soft head plate 5, the soft head plate 5 will cause membrane vibration, although this may vary depending on the operating conditions of the boiler etc. , which can sometimes generate very loud noises.

In the present invention, 5 to 1
The soft head plate 5 is supported from the inside by attaching the soft head plate support round bar 7 curved convexly to a height of 0 mm, without impairing the original function of the soft head plate 5. This has the advantage of eliminating drawbacks such as vibration.

In addition, this invention can be applied not only to newly installed flues but also to existing flues, and with a simple device, it can eliminate the major damage caused by conventional flues and ensure safety. The effect is significantly large.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an embodiment of the soft head device of the present invention. 1... flue, 2... flue plate, 3...
...Soft head plate seat, 4...Flange,
5...Soft head board, 6...Backing, 7...Soft head board support rod,
... Presser bar, 9... Studded bolt.

Claims (1)

[Scope of utility model registration request] In the flue 1 of the boiler, a broken plate (
A soft head plate (referred to as a soft head plate) 5 is attached to a seat provided on the flue plate 2, and an outer rod 7 is provided on the lower side of the soft head plate 5 to support the soft head plate from the inside, which is curved in a convex shape to the outside. , press the soft head plate 5 with the flange 4 from the upper part of the soft head plate 5 via the backing 6,
Tighten with stud bolts 9, and attach a plurality of presser rods 8 to the outermost side to prevent damage and scattering of the soft head plate 5, the soft head plate 5, the round bar 7 for supporting the soft head plate, and the presser rod 8.
Both are fixed to a seat 3 provided on a flue plate 2 of a boiler.