AT503507A1 - CONDENSING UNIT - Google Patents

Description

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Vaillant Gesellschaft m.b.H. AT 3727

The invention relates to a condensing boiler according to the preamble of claim 1.

In condensing appliances condensate falls during operation, which must be derived so that no exhaust gas can pass through the condensate drain into the room. Therefore, a siphon is provided, which closes the condensate drain. The exhaust gases are discharged via another line. However, it is necessary to provide for the siphon a relatively large cross-section to allow an undisturbed drainage of the condensate. In addition, a large cross-section is also required in order to avoid in the case of sudden water or condensate flows from the exhaust device, a vacuum of the subsequent pipe or hose condensate drainage. With large cross sections of the siphon, however, there is the disadvantage that the siphon can dry out outside the heating period.

The aim of the invention is to avoid these disadvantages and to propose a condensing boiler of the type mentioned, in which the risk of leakage and dehydration of the siphon is avoided.

According to the invention this is achieved in a condensing boiler of the type mentioned by the features of claim 1.

By the proposed measures it is ensured that ambient pressure prevails in the region of the branch and running condensate or water can not empty the siphon. In this case, relatively small cross-sections can be provided, whereby the risk of dehydration is reduced. It is also ensured by the towering over the branch leg of the siphon that in a blockage, the condensate can rise in this leg, with a corresponding sensor shutdown of the burner can be initiated, or a sufficient back pressure of the exhaust gases is enforced then also forces a shutdown of the burner.

Due to the features of claim 2, there is the advantage that overflow of the condensate or water from the downstream leg of the siphon can be safely avoided. In addition, the height of the siphon can be kept correspondingly low.

The invention will now be explained in more detail with reference to the drawing. Showing:

1 is a rear view of a condensing boiler according to the invention,

2 shows a side view of the condensing boiler according to FIG. 1 and FIG. 3 shows a detail of the condensing boiler.

The same reference numerals in all figures mean the same items.

The condensing unit shown has a provided with a rear wall 13 condensing boiler 1, which is provided with an exhaust device 2.

At the lowest point 11 of the exhaust device 2, a siphon 5 is connected, which is U-shaped and whose two legs 4 and 8 extend substantially vertically.

In this case, a branch 6 is arranged in the region of the downstream leg 8, beyond which the leg 8 projects upwards. At this junction 6 a condensate discharge line 7 is connected, which leads to a condensate lifting pump 10.

At the upper end 12 of the downstream leg 8, a check valve 9 is arranged, which reliably prevents overflow of condensate in the event of a blockage and closes at rising level.

In this case, there is a backflow of the exhaust gases and thus to a shutdown of the burner.

The check valve 9 can be carried out so that when one-sided pressurization, e.g. is pressed by a rising in the leg 8 condensate level, a diaphragm against an outlet opening and this closes.

Claims (1)

• ·· ··· • ·· ···: ϊ 1 0. 01. 00 Vaillant Gesellschaft m.b.H. AT 3727 PATENT CLAIMS Condensing boiler with a condensing boiler (1) with an exhaust device (2) at the lowest point of a siphon (5) is arranged, which is connected to a condensate drain, characterized in that the siphon (5) at its downstream leg ( 8) has a branch (6) to which the condensate discharge line (7) is connected, said leg (8) rising above the branch (6). Condensing appliance according to claim 1, characterized in that the downstream leg (8) at its free end ^ 12) with a check valve ^ (9) < - ----- ^ provided ** --------- ------ ^ is.