NL8700605A - Outlet arrangement through building wall - has eccentrically positioned tube located in central heating boiler exhaust gas outlet - Google Patents

Abstract

The exhaust gas outlet, e.g. of a central heating boiler, passes through a building wall, and prevents so-called down draught. Construction includes inner and outer tubular sections which are eccentrically positioned w.r.t. each other. Building wall includes a hole through which the outer tubular section passes in a slight outward sloping position. Inner tubular section is eccentrically positioned, and passes through the outer tubular section. Inner section slopes slightly inwards. At a wind speed of 12 m/sec. vertical to the wall, and when the boiler is not operating, the pressure difference between the air inlet and exhaust gas outlet is minimal.

Description

* ¥ VO 9075

Title: Wall terminal

The invention relates to a feed-through device, in particular for the discharge of combustion gases through a facade of a building to the outside of a combustion appliance installed in the building, such as a water heater, a central heating boiler or an air heater, and for supplying combustion air to the appliance, the feed-through device comprising an assembly of an outer tube which can be mounted in a passage opening in the facade and an inner tube extending through the outer tube, wherein the inner tube forms the combustion gas discharge channel and has a discharge end which protrudes beyond the outside. end of the outer pipe located at the facade, with which the protruding inner pipe end delimits the inlet of the air supply duct of the combustion appliance.

The purpose of such a wall feed-through device is to protrude the inner tube further from the facade than the outer tube, to separate the exhausted combustion gases and the fresh outside air to be supplied to the combustion device 20. A drawback of this form of outlet of a wall feed-through device is that, during standstill periods of the combustion appliance, wind load on the facade in the appliance can cause an undesired air flow, namely opposite to the flow direction during operation, with the result that the pilot flame is extinguished and other unwanted effects.

With a view to preventing such undesired air flows in the appliance, the design of a wall feed-through device must be such that, in case of wind load perpendicular to the façade in question, the pressure difference in the air inlet measured with the appliance not working and in the combustion gas -> 7 0: · ri, ".t% -2- exhaust, is as small as possible.

Slates, end caps and the like price enhancers used hitherto to separate the combustion gases and the fresh combustion air and to prevent flue gas backlash are not able to prevent the adverse effects of wind load in non-operating combustion appliances outlined above.

The object of the invention is to provide a wall feed-through device 10, wherein this drawback of known devices of the type mentioned in the preamble is avoided in a constructionally simple manner.

To this end, in an eccentric arrangement of the inner tube at the top of the outer tube, the inner end 15 is extended by an upwardly opening outlet with a longitudinal section of the tube, substantially in the form of a circular sector or a triangle, the free edge of the outlet being vertically encloses an angle of 25 ° -60 °, preferably 40 °.

20 Due to this simple measure, which furthermore does not impose any obstacles to the mounting of the pipe assembly, for instance leaving the retractability in the passage opening in the facade unaltered from the inside, it appears in practice, irrespective of the wind load, that the combustion appliance during standstill measured pressure difference between air inlet and flue gas outlet, to be extremely small.

To clarify the invention, an exemplary embodiment of the wall feed-through device will be described with reference to the drawing.

Fig. 1 is a schematic longitudinal sectional view of the outlet of the wall terminal and

Fig. 2 is an end view of the device of FIG. 1.

35 In the drawing a facade 1 is indicated with a passage opening 2. A P * 1 f n A A ït extends through this opening 2

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-3- ê outer tube 3 which in practice may be mounted slightly downwardly inclined and terminates in a straight edge 4. Eccentrically inside the outer tube 3, placed against the top thereof, extends outwardly 5 slightly upwardly, an inner tube 5 beyond the end edge 4 of the outer tube 3. The inner tube 5 is extended by a spout 6 which, in the illustrated embodiment, has the configuration of a torus sector such that an outer spout 6 is formed on the outer tube 5, opening upwards in an end edge 7, which is a longitudinal section of the tube 5 has the shape of a circle sector, the free edge 7 of the outlet 6 enclosing an angle M with the vertical between 25 ° and 60 °. The bottom 10 of the outlet 6 can also be flat 15, as indicated by 10 ', so that the longitudinal section of the tube 5 has a triangular cross section.

In the drawing there is also indicated a van grid 8 and a connecting seam 9 of the outlet 6 to the inner tube 5.

In a practical embodiment, the outer tube 3 has a diameter of 128 mm, the inner tube 5 has a diameter of 80 mm and the inner tube 5 protrudes over a distance "A" of 4 cm beyond the end edge 4 of the outer tube 3.

At a wind speed of 12 m / sec. perpendicular to facade 1, when the appliance is stationary, a pressure difference of only 3 mm of water pressure is measured at the appliance between the air inlet and the flue gas discharge.

* 7 Γ A G 0

Claims (2)

1. Feed-through device, in particular for discharging combustion gases through a facade of a building from an incinerator installed in the building, such as a water heater or a central heating boiler, and for supplying combustion air to the appliance, which feed-through device comprises an assembly of an outer tube which can be mounted in a passage opening in the facade and an inner tube extending through the outer tube, wherein the inner tube forms the combustion gas discharge channel 10 and has a discharge end which projects beyond the end of the facade situated on the outside of the facade. outer tube, with which the protruding inner tube end defines the inlet of the air supply channel of the combustion appliance, characterized in that in an eccentric arrangement of the inner tube (5) at the top of the outer tube (3), the inner tube end is extended by an upward opening spout (6) with longitudinal section of the tube (5), mainly in the form of a circular sector or a triangle, the free edge (7) of the outlet (6) 20 including an angle (M) of 25-60 ° with the vertical. A feed-through device according to claim 1, characterized in that with a diameter of the outer tube (3) of approximately 12.5 cm, a diameter of the inner tube (5) of approximately 8 cm, it is approximately 4 cm beyond the end edge (4 ) of the outer tube (3) protruding end of the inner tube (5), the spout (6) has an end edge (7) which slopes down from the top of the inner tube (5) at an angle (M) of approximately 40 ° with the vertical. ƒ 5; 0 f% 0 ^ -i. * - v «v *: 'V