DE2247898A1 - WATER BOILERS FOR OIL OR GAS FIRING - Google Patents

Description

AiCTIEBOiAGEO? OTO, Goteborg, Sweden

Viasser boiler for oil or gas firing.

The present invention relates to an oil or gas fired water boiler which is different from ordinary ones The main difference between water heating boilers is that the actual boiler is usefully as a standing cylinder Shaped vessel made of concrete or another ceramic material and from a detachable one that closes off the concrete vessel Lid made of steel or other material is assembled, in which lid the combustion chamber protruding into the concrete vessel and the flue gas pipe connected to its lower end is.

The new boiler is intended in particular for installation in buildings without a cellar, whereby the boiler is advantageous directly in the ground recessed, with the exposed cover at floor level. With such an attachment of the boiler the concrete vessel is supported by the surrounding earth, so that the vessel often withstands the internal water pressure even with a massive wall thickness can withstand without reinforcement. As a rule, however, it is preferred to reinforce the concrete vessel, preferably with ■ previously stretched reinforcement iron, so that the reinforcement also is exposed to tensile forces due to the temperature of the boiler water after its length has been extended.

Since concrete and other ceramic materials are poor conductors of heat, the new boiler usually does not need to Heat to be insulated. This is especially true when laying the boiler in the ground.

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The invention is illustrated in detail below of the accompanying drawings, which illustrate two exemplary embodiments}. In the drawings shows: -

FIG. 1 shows an axial section through a boiler according to a first embodiment

Figure 2, on a larger scale, an axial section through an elastic connection between the concrete vessel and the metal lid;

Figure 3 shows an axial section through a boiler according to a twelfth embodiment

In both exemplary embodiments, the actual boiler consists of a vessel 10 made of concrete or another ceramic material, shaped like a standing cylinder with a curved bottom, and a curved lid 11 made of steel or other attached material that detachably closes the mouth of the concrete vessel. At the edges of a circular opening in the lid, a cylindrical sheet metal tube 12 hanging down in the concrete vessel and serving as a combustion chamber is welded, which at the lower end evenly merges into a sheet gas tube 13 with a significantly smaller cross section. The flue gas pipe 13 runs in the shape of a U first down towards the bottom of the vessel and then up again * up towards the cover 11 and out through an opening made therein, at the edges of which the pipe is welded. At its end protruding from the cover 11, the flue gas pipe 13 is detachably connected to a flue gas duct 1h via a connecting piece 15. An oil burner, designated 16, is mounted on the cover 11 just above the combustion chamber 12 and is arranged in such a way that the flame is directed straight down into the combustion chamber. Furthermore, connections to the radiator circuit, not shown, and to a water heater 18 are passed through the cover.

With 20 denotes a number around the circumference evenly distributed, cast in the wall of the concrete vessel 10 Anchor bolts, which protrude above the flat end surface of the concrete vessel and through corresponding holes in the metal

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22A7898

Lischen cover 11 pass. The anchor bolts 20 are provided with a thread at the free end in order to be able to receive retaining bolts 21. A relatively thick, elastically compressible packing 22 made of rubber or the like is inserted between the cover 11 and the concrete vessel 10 and ensures a liquid-tight connection between the metal cover and the concrete vessel. The construction is designed so that the cover can move relatively freely in the radial direction with respect to the concrete vessel when the boiler water temperature changes. For this purpose, as shown in Figure 2, a rubber claw 23 can be pushed over each retaining bolt 20, which extends from the flat end surface of the concrete vessel a little down into the concrete wall, so that the retaining bolt can bend to the required extent when the metal cover expands without the stresses on the concrete vessel becoming too great. If necessary, a preferably pre-stretched armor 2 ¹ J- can be poured into the above appropriately thickened concrete wall outside the rubber-coated retaining bolts 20, so that any risk of the concrete vessel breaking under the action of thermal forces is avoided.

Bas concrete vessel 10 can, if necessary, to the vessel to make waterproof, to be provided on the inside with a sealing cover, e.g. consisting of a thin rubber bag, which protrudes at the upper end and is clamped under the cover 11 or the sealing ring 22.

The water space of the boiler can be connected to an open expansion vessel located at the higher level, for example via a separate pipe socket welded to the cover. Alternatively, an expansion vessel can be installed in the boiler be arranged, which consists of a completely closed, gas-filled vessel with deformable, two-dimensional corrugated walls.

According to Figure 1, the concrete vessel is in the ground as a whole sunk so that only the metal cover 11 is uncovered in the ground * 'surface level. In this arrangement, the particular suitable for villa buildings without a basement, is there? around the boiler packed soil material support the boiler and prevent the concrete vessel from closing under the influence of the internal water pressure

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break, which is why in some cases no special reinforcement of the concrete vessel 10 is required. If desired, can However, the concrete vessel is reinforced, expediently by a reinforcement that is stretched in advance to such an extent that it is exposed to a draft even after an extension due to the increase in the temperature of the boiler water

The boiler of Figure 3 differs from that shown in Fig. 1 and 2 essentially in that the water space of the boiler is limited by a relatively thick rubber bag 2 $ , which is designed so that it changes its volume under the action of the internal water pressure can. A free space 26 is formed between the sack 25 and the inside of the cylindrical concrete vessel 10, which is filled with air or another gas and sealed off from the outside air, so that a permanent gas cushion is formed that the pressure of the boiler water on the rubber sack to enclose Concrete vessel 10 transfers. In this arrangement there is obviously no need for a special expansion vessel. The gas cushion 26 between the sack and the concrete vessel also prevents the vessel from breaking in the event that the water in the kettle would float.

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Claims (6)

(1 / · Water boiler for oil or gas firing, thereby marked that the actual boiler is assembled by a zwakmässig as a standing one. Cylinder shaped vessel made of concrete or another ceramic material and a detachable steel or cover that closes off the concrete vessel another material in which lid that is in the concrete vessel protruding combustion chamber as well as the flue gas pipe connected to its lower end is suspended «, ' 2. Water boiler according to claim 1, characterized ₉ that thus constituted, resiliently compressible seal is inserted between the preferably metallic cover and the concrete vessel, the lid that vernal tnismässig freely with respect to the concrete vessel, the temperature of the water in case of change can move · 3. Water boiler according to claim 1 or 2 _3, characterized in that the concrete vessel is at least partially reinforced ₉ preferably by a reinforcement stretched in advance «, H. Water boiler according to claim 1, 2 or 3? characterized in that the concrete vessel is "provided" with an inner sealing covering, for example a thin rubber cloth 5. Water boiler according to any one of claims 1- ^, characterized in that the water space is reduced by an expandable sack made of rubber or similar which has reached the concrete vessel Space content than the concrete vessel is limited, so that a gas-filled space is formed between the bag and the concrete vessel. 6. Water boiler according to claim 5? characterized in that the fi-eie space between the elastic bag and the enclosing concrete vessel is hermetically sealed ₃ so that a gas cushion is formed, the volume and pressure of which changed when the water temperature changes 30981 S / 0273