DE29511847U1 - Gas heater - Google Patents

Description

0 7. vJuii 1995

Joh. Vaillant GmbH u. Co. GM 1376

The invention relates to a gas heater according to the preamble of claim 1.

Highly efficient atmospheric gas heaters of the type mentioned above result in very low exhaust gas temperatures. If such gas heaters are connected to moisture-sensitive exhaust gas systems, it is necessary to increase the exhaust gas temperature to such an extent that no condensate forms in the exhaust gas system.

Up to now, a portion of the exhaust gases has been led past the fins through a gap in the finned heat exchanger and mixed with the cooled exhaust gases. However, this results in a reduction in efficiency and the moisture content of the exhaust gases does not change.

The aim of the invention is to avoid this disadvantage and to propose a gas heater of the type mentioned at the beginning, in which the gas heater can be easily adapted to the requirements of a moisture-sensitive exhaust system, whereby both the exhaust gas temperature is increased and the moisture content of the exhaust gas is reduced. The drop in efficiency is less than with the gap in the finned heat exchanger.

According to the invention, this is achieved in a gas heater of the type mentioned at the outset by the characterizing features of claim 1.

The proposed measures make it possible to operate a gas heater according to the invention with cover plates covering the gap in exhaust systems that are not sensitive to moisture, and to remove the cover plates when connecting such a gas heater to an exhaust system that is sensitive to moisture. By opening the gap between the heating shaft and the outer shaft, the air heated by the heat radiation from the heating shaft can rise upwards in the gap, mixing with the exhaust gases rising into the flow protection device in the area of the flow protection. This increases the temperature of the exhaust gases and reduces the moisture content of the gases leaving the flow protection device and entering the exhaust system. The air heated in the gap between the heating shaft and the outer shaft makes a significant contribution to this.

The features of claim 2 result in the advantage that the cover plates can be easily removed and reattached even when the flow protection device is installed.

The features of claim 3 result in the advantage that the cover plates can be very easily attached and removed.

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

Showing:

Fig. 1 shows a schematic section through a gas heater according to the invention,

Fig. 2 a top view of the gas heater according to Fig. 1 with the flow protection removed and

Fig. 3 is a side view of the gas heater according to Fig. 1. The same reference numerals indicate the same details in all figures.

Fig. 1 shows a schematic view of a gas heating device 1 according to the invention. In this device, a heating shaft 2 which laterally delimits a combustion chamber 11 and in which a burner 5 and a heat exchanger 6 are arranged is surrounded by an outer shaft 3 while maintaining a circumferential gap 4. This heat exchanger 6 is connected to a heat consumer on one or both sides via a supply and return line 15, 16.

Above the outer shaft 3 and the heating shaft 2, a flow protection device is arranged, which opens into an exhaust system 8, e.g. a chimney. This flow protection device 7 has guide plates 9 and guide devices 10 held on the walls of the outer shaft 3 and inclined upwards, between which room air can flow in and flow into the exhaust system 8 together with exhaust gases.

In the area of the upper edges 12, 13 of the heating and outer shafts 2, 3, which end at almost the same height, cover plates 14 are designed in a flat, rectangular shape. In the outer shaft 3, a slot 18 is provided on or at the sides of the casing, through which a cover plate 14 is inserted, which rests on the other side on the upper edge 12. This means that the cover plate 14 can be inserted and removed again without dismantling the flow protection device 7.

As can be seen from Fig. 2, cover plates 6 are arranged on all four sides of the shafts 2, 3, which are essentially rectangular in cross section.

When connecting the gas heater 1 to a moisture-sensitive exhaust system 8, the cover plates 14 can be removed. This allows the dry air heated in the gap 4 by heat radiation from the heating shaft 2 to rise upwards and reaches the flow protection 7, in the area of which this heated air mixes with the exhaust gases from the burner 5, which have cooled considerably after flowing through the heat exchanger 6. This increases the temperature of the gases flowing into the exhaust system 8.

while simultaneously reducing their moisture content, thereby preventing the formation of condensate and moisture in the exhaust system.

Claims (1)

EXPECTATIONS Gas heating device with an atmospheric burner which is arranged in a heating shaft surrounded by an outer shaft forming a circumferential gap, wherein a flow protection device is provided which covers the outer shaft and opens into an exhaust gas system, characterized in that the gap (4) remaining between the heating shaft (2) and the outer shaft (3) is closed at the top with removable cover plates (14). Gas heating device according to claim 1, characterized in that the cover plates (14) extend through slots (18) of the outer casing (3) and rest on the upper edge (12) of the heating casing (2). Gas heater according to claim 1, characterized in that in a gas heater having a substantially rectangular cross-section, a cover plate (14) is provided for each side of the circumferential gap (4).