DE9406179U1 - Boiler flue pipe - Google Patents

Description

(17 169) Boiler exhaust pipe

The innovation concerns a boiler exhaust pipe for connecting a boiler to a chimney, consisting of a substantially horizontally oriented pipe section leading to the chimney, on which an upwardly extending branch pipe section with an element that reacts to burner pressure surges is arranged adjacent to the boiler connection opening.

Such a boiler exhaust pipe is known, for example, from DE-GM 93 00 1^7/8, in which a branch line with an extension is connected to the line section adjacent to the boiler connection opening and a membrane in the form of a so-called flutter bag is arranged in this. With such a design, start-up pressure surges or pulsation oscillations caused by the burner up to absolute pressure values of 2,000 Pa, i.e. + 2,000 Pa, can be captured or removed from the gas-carrying interior of the

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boiler and its adverse effects.

This well-known exhaust gas exhaust pipe has proven to be capable of improvement and, while fulfilling the same basic task, namely to ensure that such pulsation vibrations no longer have a detrimental effect on the operational safety of the connected

In order to take account of the effects that can have on the boiler, the design of such an exhaust gas outlet pipe should be simplified even further, without having to use elastic and heat- and age-resistant material for the essential functional element, which also requires special mounting measures in or on the branch line section.

This task is solved with a boiler exhaust pipe of the generic type according to the innovation in that the evasive movable element is guided with play in the branch line section and is arranged so that it can move freely between the closure of the branch line section and an annular seat above the connection opening to the line section.

This new design eliminates the need for elastic, heat- and ageing-resistant material, does not require a firm and tight integration of the flexible element in the branch pipe section, which also no longer has to be connected to the chimney, since the branch pipe section is designed to be absolutely tight and there is no danger of leakage.

Advantageous embodiments consist in the branch line section being arranged vertically or preferably inclined in the direction of flow in relation to the direction of extension of the line section. In particular, the inclined arrangement has proven to be particularly advantageous.

proven to be effective, since the branch line section with its opening points against the direction of the pressure wave. Furthermore, the evasive element is designed as a cylindrical or spherical hollow body, whereby the cylindrical hollow body can be open at the top or bottom, i.e. pot-shaped. In order to be able to insert the element into the branch line section without any problems, its closure is suitably detachable and arranged in a suitable sealed manner.

The new boiler exhaust pipe is explained in more detail below using drawings of examples of implementation.

It shows schematically

Fig.1-3 in side view an embodiment in different operating states;

Fig. 4 shows a side view of another embodiment;

Fig.5A-C in section embodiments of the evasive movable element and

Fig. 6 shows a special embodiment in section.

The boiler exhaust pipe consists in a known manner of a substantially horizontally oriented pipe section 1 leading to the chimney, on which an upwardly extending branch pipe section 3 with an element 4 that reacts to burner pressure surges is arranged next to the boiler connection opening 2.

ter "leading to the chimney" means that the direct connection between the boiler and the chimney is established with pipe section 1 or that another normal pipe section is connected to pipe section 1 up to the chimney.

For the boiler exhaust gas outlet pipe, it is now essential that the evasive element 4, which is guided with play, is arranged in the branch line section 3 and is freely movable between the closure 5 of the branch line section 3 and an annular seat 6 above the connection opening 7 to the line section 1. In the embodiment shown in Figs. 1 to 3, the element 4 is a spherical hollow body made of, for example, thin stainless steel sheet. However, cylindrical hollow bodies are also suitable, as shown in Figs. 5A-C, whereby in case A the hollow body is open at the top, in case B at the bottom and in case C the hollow body is designed as a self-contained hollow body. The most favorable embodiment is that according to Fig. 5B, since here the possible evasive or adjustment path is the greatest with a comparable length of the branch line section 3.

Fig. 4 shows the preferred embodiment in which the branch line piece 3 is associated with the line piece 1 in the direction of extension, for example at an angle of 45° in the flow direction. The closure 5 at the upper end of the branch line piece is detachable, i.e. can be screwed on, for example, or like a can lid

can be pressed open and is sealed in a suitable manner. There is therefore no risk of leakage, which is why the branch line section 3 does not have to be extended to the chimney (not shown).

When the burner is stopped, the element 4 rests on the ring seat 6 and closes off the compensation chamber 3'. When the burner starts and a pressure wave is triggered as a result, the element 4 is pushed upwards and the pressure wave loses its retroactive force on the combustion chamber (Fig. 2). During continuous operation, the element according to Fig. 3 returns to its normal position according to Fig. 1. The same thing naturally happens when, due to special external influences, back pressures arise on the chimney that impair the normal flow of exhaust gases.

Furthermore, the double sliding piece 3, as shown in Fig. 6, can also be designed to be extended above the rest position area of the element 4, whereby it only has to be ensured that the element 4 assumes its closed position when the pressure is released. In the case of a spherical element 4, this only requires a funnel-shaped transition 8 and in the case of a cylindrical element 4, the arrangement of guide elements 9, which can be attached to the closure 5, for example.

Claims (5)

(17 169) Protection claims: 1. Boiler exhaust pipe for connecting a boiler to a chimney, consisting of a essentially horizontally oriented pipe section (1) leading to the chimney, on which an upwardly extending double-sliding piece (3) with an element (4) that reacts to burner pressure surges is arranged next to the boiler connection opening (2), characterized, that in the branch line piece (3) the evasive movable element (4) guided with play and this between the closure (5) of the two-way sliding piece (3) and an annular seat (6) above the connection opening (7) is arranged to be freely movable relative to the line section (1). 2. Exhaust pipe according to claim 1,
characterized, that the double-sliding line piece (3) is arranged vertically to the line piece (1) in relation to the direction of extension or preferably inclined in the direction of flow. 3. Exhaust pipe according to claim 1 or 2,
characterized, that the evasive movable element (4) is designed as a cylindrical or spherical hollow body. 4· Exhaust gas exhaust pipe according to one of claims 1 to 3,
characterized,
that the closure (5) is detachably arranged on the branch line piece (3). 5. Exhaust pipe according to one of claims 1 to 4,
characterized,
that the cross-section of the branch line piece (3) is larger than that of the line piece (1) and a funnel-shaped transition (8) forming the annular seat is arranged between the branch line piece (3) and the line piece (1).