JPS5821183B2 - Closed forced draft boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed forced draft boiler, and more particularly to a closed enclosure of novel construction for introducing fresh air and discharging combustion gases.

Water heaters or boilers in which the combustion chamber communicates with the outside air are known.

In some cases, the device is surrounded by an intermediate chamber which serves to supply air and surrounds the combustion chamber in a sealed manner.

In other relatively recently known devices, it is the outer jacket of the device that forms the closed intermediate chamber, through which the fresh air circulates before passing through the burner in the combustion chamber. Introduced through an orifice in the rear wall of the jacket, combustion gases are exhausted from the combustion chamber via a hood, an exhaust fan and an outlet pipe, preferably concentric with the fresh air inlet pipe.

However, this type of device presents several difficulties, in particular with regard to the assembly of the outer jacket, the accessibility of the various control mechanisms of the device, and the tightness of the combustion chamber.

This is only a problem because in order to ensure that the combustion chamber is sealed, a nearly horizontal plate must be installed at the bottom of the device, running between the burner and control mechanisms such as water and gas flow control valves. It becomes difficult.

Such horizontal plates must be hermetically connected to the rear and front walls of the device, and sealing must be ensured where gas or water lines pass through the horizontal plates. This creates problems regarding assembly and accessibility.

The object of the present invention is to provide a boiler with a closed enclosure which eliminates the above-mentioned drawbacks of the known devices, and the boiler according to the invention is a forced draft closed gas boiler with a closed enclosure, in which the boiler has a closed enclosure. The enclosing portion includes an upper lid, a vertical rear wall, left and right side walls, a front wall, flange-shaped left and right horizontal lines fixed to the both side walls, and a vertical line extending vertically downward from the inner end of the horizontal edge. A combustion device and a thermal combustion device, which are constructed in a closed manner by a U-shaped casing integrally formed by a wall and a lateral bottom part, and consist of an exhaust hood forming a top part and a skirt part depending from the periphery of the hood. A firebox main body containing a replacement device is disposed with a lower half part fitted into the U-shaped casing, and at least an upper part of the firebox main body penetrates the skirt part and the left and right horizontal edges. and supported on said horizontal edges by water inlet and outlet pipes fixed thereto, said skirt part and said vertical wall of said casing having a narrow gap defining a fresh air passage therebetween. In the forced draft boiler, the opening of the hood of the firebox main body is located at the top, the opening of the hood of the firebox body communicates with the outside world through an outlet pipe containing an exhaust blower, and the inside of the sealed enclosure communicates with the outside world through an air introduction pipe. characterized by something.

Other features and advantages of the invention will be explained in more detail below with reference to the accompanying drawings, which show examples of embodiments.

The hermetic boiler shown in the figure mainly consists of a rear wall 5 equipped with a support 2 that can be fixed to the wall for installation at a predetermined location, and two plates, the upper part of which is made of a non-perforated steel plate and the lower part of which has a large opening. It includes a side wall 3 and an upper lid 4.

The four elements welded together form a sealed enclosure.

The U-shaped casing, designated as an assembly by the reference numeral 1 and formed by stamping, comprises two pieces terminating by a horizontal edge 12 having a transverse bottom 10 and a refolded end 13 which allows fixing of the casing to the side wall 3. It consists of a vertical wall 11.

The casing 1 is therefore arranged inside the closed enclosure in such a way that the horizontal edge 12 lies approximately at the same level as the opening provided in the side wall 3.

The casing 1 that limits the volume of the sealed enclosure to the lower side is
Furthermore, it includes a small edge 14 formed of a steel plate bent in the longitudinal direction of its outer shape, and a V-shaped recess 15 is provided at the front of the lateral bottom.

The base of the closed enclosure thus provided is therefore a chamber having a narrower width (limited by the vertical walls 11) than the height, whose width is limited by the side walls 3.

The burner element 6 together with the ignition pipe I and the ignition and safety device 8 are mounted on a similar V-shaped support 16 for easy placement at the bottom of the enclosure in narrow width rooms, the reservoir support 16 being It is fitted into the recess 15 of the lateral bottom 10.

In this case, the seal is ensured by rubber seals along the edges of the support 16.

The rubber seal thus serves as a sealed crossing point for the gas inlet pipe to the starter and burner, the high-pressure ignition wire of the starter and the connection of the flame control thermocouple.

The firebox body 9, known per se, comprises a water tube 2 with a collar 21.
0 on the horizontal edge 12 of the casing.

For this purpose, the rim 12 is provided with an opening for the passage of the main tube and, where appropriate, an additional opening for the passage of a thermometer or superheat detector.

All such openings are sealed by suitable gaskets.

Therefore, the limbs leading to the outside of the vertical wall 11 of the casing are
is easily accessible through an opening in the side wall and thus
It can be connected to a mechanism (not shown) located at the bottom of the device below the bottom 10 of the casing.

The rectangular skirt of the firebox body includes a removable front plate 22 and a folded steel assembly 23 forming a rear plate and two side plates, which assembly can be directly or indirectly connected to a horizontal edge. 12 is provided.

The front plate 22 engages with grooves (not shown) on the side plates and includes stops that cooperate with vertically positioning pawls.

The lower part of the skirt rests on the burner group 6.

The interior of the skirt is lined with a refractory lining for thermal insulation.

The skirt is held away from the vertical wall 11 and rear wall 5 of the casing by bosses, not shown, formed during the wall stamping operation.

The exhaust hood 25 of the gas burner is placed on the upper part of the firebox body 9.

The hood has the shape of a cap and is provided with an opening 26 on its side.

A relatively large diameter orifice 3 in the rear wall 5 of the device
An exhaust blower 29 with an outlet pipe 30 engaging the opening 26 is fixed to the opening 26 .

Furthermore, said orifice 31 cooperates with a fresh air inlet pipe 32 which ensures communication of the hermetic boiler with the outside of the given location. A wall 33, which part has the width of the casing 1, is attached to the closed enclosure provided in this way.

It is possible to see the ignition device through the window 34, and a boss 35 obtained by stamping holds the removable front plate 22 at some distance from the front wall.

It is clear that the front plate is fixed to the enclosure in a sealed manner.

The entire lower part of the casing 1 contains the pump and the mechanism and control housing.

The assembly has an easily disassembled exterior.

FIG. 2 more clearly illustrates the passage of air and combustion gases within the device.

Naturally, the drawings do not show the front wall 33, which is attached in a sealed manner to the edge of the enclosure defined by the lid 4, the side walls 3 and the casing 1, is known to take exactly the shape of the external shape.

The movement of air and gas inside the enclosure is controlled by a ventilator 29.
This is ensured in a manner known per se.

Fresh air is introduced from the outside via the opening 31.

Fresh air circulates in the direction indicated by the arrow towards the base of the enclosure, thereby passing between the wall 11 of the casing and the vertical walls 22, 23 forming the skirt of the firebox body and reaching the aforementioned bosses. Air flows through the confined space bounded by the skirt at a relatively high velocity to facilitate cooling of the skirt.

Air passes below the burner 6 and the combustion gases collected in the hood 25 are discharged via the exhaust pipe 30 by the ventilator 29.

The hood protrudes slightly over the upper part of the firebox body, as well as the scar, so that the combustion gases have no or little chance of overflowing into the enclosure where fresh air is circulated.22. 23 is placed at the bottom of the firebox main body.

Finally, a surge tank 36 located at the rear of the device between the bottom 5 and the locking wall is shown in FIG.

Thus, the general dimensions around the outside of the device described as a non-limiting example are reduced and the volume of the inner enclosure is completely filled by the burner assembly and firebox body.

As soon as the front wall 33 is removed, the burner can be easily disassembled after lifting the removable plate 22 of the skirt while disengaging the support 16 from the recess 15.

The hood itself is easily placed on the firebox body 9.

Similarly, the firebox body can be lifted to disengage the tube 20 from the orifice in the horizontal edge.

Assembly and disassembly of this type of device is therefore very easy.

Furthermore, since the front wall 33 only covers the closed enclosure,
In normal use, it can be easily disassembled and, furthermore, all mechanisms located at the bottom, which are hidden only by the pivotable or swingable casing, are completely accessible.

The mechanism is also ensured to be vented by the surrounding atmosphere.

Since the mechanism is thermally insulated from the heating part by the casing 1, the mechanism can be made of materials commonly used in everyday use, in particular plastic parts.

The invention is not limited only to the embodiments described above, but also includes all other structural features.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a device assembly according to the present invention. FIG. 2 is a schematic front view with the front wall removed. 1...Casing, 2...
・Support body, 3...Side wall, 4...
...Lid, 5......Rear wall, 6...
...Burner, 7......Start device, 9...
・・・・・・Firebox main body, 10・・・・・・Lateral bottom, 11・・・・・・Vertical wall, 12・・・・・・
...Horizontal edge, 15 ...... Concavity, 20
......Water inlet and outlet pipe, 22...
・Front plate, 23... Assembly of rear plate and side plate,
33...Front wall.

Claims (1)

[Scope of Claims] 1. A forced draft sealed gas boiler having a sealed enclosure, wherein the sealed enclosure includes an upper lid 4, a vertical rear wall 5, left and right side walls 3, a front wall 33, and both side walls 3. 7 fixed to
The U-shaped casing 1 is formed integrally with the inner ends of the left and right horizontal edges 12 in a flange shape, the vertical wall 11 extends vertically downward from the lateral bottom 10, and the U-shaped casing 1 forms a top part. The firebox main body 9, which is composed of an exhaust hood 25 and a skirt portion hanging down from the periphery of the hood 250, and which houses a combustion device and a heat exchange device, has its lower half fitted into the U-shaped casing 1. At least the upper part of the firebox main body 9 is provided on the horizontal edge 12 by a water intake pipe and a water outlet pipe 20 that pass through the skirt portion and the left and right horizontal edges 12 and are fixed thereto. supported, the skirt part and the vertical wall 11 of the casing 1 are located at a distance between them a narrow gap forming a passage for fresh air, and the opening 26 of the hood 25 of the firebox body 9 is A forced draft boiler, which communicates with the outside world through an outlet pipe 30 containing an exhaust blower 29, and the inside of the sealed enclosure communicates with the outside world through an air introduction pipe 32.