DE7903632U1 - BOILER FIRED WITH A BURNER - Google Patents

Description

Volrat Thamsgatan 18

S-41278 Gothenburg, Sweden

Central heating boiler fired with one burner

The invention relates to a heating boiler fired with a burner, in particular for central heating in Houses, with an automatic burner control depending on temperature changes.

If the burner switches off on such a boiler, the boiler and the exhaust gas outlet are still hot, so that there is a noticeable draft through the boiler results, which brings noticeable heat loss with it. To avoid or at least reduce such heat losses various types of shut-off or control devices known as valves are known which either close the flue or open a connection between the flue and the boiler room, see above that a shunt connection reduces the draft through the boiler.

This valve arrangement is often of complicated construction and seldom leads to the desired result. With the invention should a heating boiler with such a valve control be created, which is simply constructed and works reliably, is easy to install and the smoke exhaust

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- 4 effectively closes when the burner is switched off.

The solution to this problem is provided by the characteristic Features of claim 1.

The seat for the valve ball can be shaped like a lattice Work together guide, which enables the valve ball to be lifted in a straight line upwards from the sealing seat, so that the combustion gases laterally through the guide escape. Alternatively, a bearing surface can be formed around the sealing seat so that the valve ball from the sealing seat through the combustion exhaust gases to the side can be moved. The bearing surface is slightly smaller than the diameter of the valve ball radial expansion.

In both cases the valve ball is washed around by the exiting combustion gases and kept in motion.

The burner is preferably connected to a temperature sensor in such a way that the burner fan starts up first. A pressure sensor in the flue gas outlet downstream of the valve controls the fuel supply to the burner, if a certain one Pressure in the flue is achieved.

Further details, features and advantages of the invention emerge from the following description of embodiments based on the drawing. It shows

1 shows a vertical section through a small-sized heating boiler according to the invention with a shut-off valve,

FIG. 2 shows a partial section through the heating boiler according to FIG. 1 with another embodiment of the valve and

3 shows a section along line III-III in FIG. 2.

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The boiler, which can be of known type and is designed according to the local energy demand, has In the example case, a vertical flame tube 10, the lower end of which opens into an afterburning chamber 11. the Post-combustion chamber 11 also serves as a deflection chamber for the combustion gases, which pass through a number of smoke tubes 12 flow back upwards. The upper ends of the smoke tubes 12 open into a collecting chamber 13, which with a smoke exhaust 14 is in connection.

The flame tube 10 and the smoke tubes 12 are of one Surrounding water-carrying jacket 15, to which a water-cooled wall 16 is connected, which the afterburning chamber 11 delimits.

The heated water is drawn off via a line 17 and fed to a consumption point not shown in detail and then returned to the boiler via a line 18.

The burner labeled 19 is attached to the upper end of the flame tube 10. The burner can be of usual Be of construction and is provided with a fan 20, which supplies the required combustion air.

A drive motor 21 for the fan 20 and the fuel pump are automatically transferred in a manner known per se a thermostat 22 controlled, which measures the temperature of the water in the boiler or in a room to be heated.

When the fan is switched off, the boiler and the flue gas outlet 14 are still so hot that air by natural Convection is sucked through the boiler and through the flue gas vent 14. This cools the boiler and there is a noticeable loss of heat until the burner is ignited again.

For a conclusion of the flue gas vent 14 when it is shut down Burner, a total of 23 designated valve is provided, which in a local extension 24 of the Flue gas vent 14 is arranged.

The valve has a valve ball 25 which cooperates with an annular sealing seat 26. The valve ball has a thin metal wall and is so light that it can normally be penetrated by the outflowing combustion gases is held in suspension, which flow over the sealing seat 26. The sealing seat 26 has a circular cross-section, so that when the valve ball 25 hits the sealing seat 26 if the flow of combustion gases ceases to exist circular contact surface between the sealing seat 26 and the valve ball 25 is present, which lifts the valve ball 25 not obstructed when the combustion gases flow again » Furthermore, the spherical shape of the valve ball 25 and the circular shape of the sealing seat 26 result in a sufficient independence of the seal from temperature fluctuations.

The valve ball 25 is enclosed by a grid-like or grate-like guide 27, which has a few vertical rods 28, preferably three rods 28, which extend along an imaginary circle circumscribing the valve ball 25 are arranged with a slightly enlarged diameter. As a result, the valve ball 25 can only move in a straight line be raised from the top of the sealing seat 26, the combustion exhaust gases flow through the guide 27 and so through the extension 24 of the flue gas vent 14 to Can exit the chimney.

As is readily apparent from the drawing, the valve is designed so that it can be used for maintenance and cleaning work can be quickly and easily pulled out of the flue gas vent 14.

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In the flow downstream of the valve 23 there extends a pipe 29 which has its mouth against the exhaust gas flow pointing and is connected to a pressure sensor 30 which controls the fuel supply to the burner.

When the boiler is not working, the valve ball 25 rests against the sealing seat 26 and prevents a flow through the flue gas duct 14. When the thermostat 22 generates a control signal for starting the fan motor 21, the fan 20 starts up first. As a result, air is conveyed through the boiler into the flue gas vent 14, so that the valve ball 25 is lifted off the sealing seat 26.

When the pressure sensor 30 measures an increased pressure downstream of the valve 23, the fuel supply is opened and the burner is ignited in the usual way.

In Fig. 2, in which corresponding parts are provided with the same reference numerals and which have a boiler of the same type As illustrated in Fig. 1, the valve 23 is illustrated in a modified form.

The extension 24 of the flue gas outlet 14 is circular Cross section, and the sealing seat 26a is surrounded by a bearing surface 31, the radial extent of which is somewhat smaller is than the diameter of the valve ball 25 · As can be readily seen from FIG Part of the valve ball 25 illustrated in solid lines Opening division over the circumference of the opening of the sealing seat 26a inwards.

In this open position, the valve ball 25 is partially surrounded by the flue gases and kept in motion. wherein either a rotary movement around the center of the valve ball 25 and / or a translational movement around the Edge of the sealing seat 26a takes place around. The support surface can be slightly downward in the direction of the sealing seat 26a

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be inclined so that the valve ball 25 falls quickly into the closed position when the flow in the flue 14 is no longer applicable.

In both embodiments, the valve ball 25 is through the flow of exhaust gas kept rotating, causing an accumulation of combustion residues on the valve ball 25 prevents and thus reduces the risk that the valve ball 25 due to dirt adhering to the Sealing seat 26 or 26a sticks.

Claims (4)

t · r «ta ···« ι ·· Nils Östbo 19 404 60 / ko Volrat Thamsgatan 18 S-41278 Göteborg, Sweden Claims for protection 1. Boilers fired by a burner, especially heating boilers for central heating, with automatic control of the burner depending on temperature changes and a shut-off valve in the flue gas outlet, characterized in that the valve (23) is in an extension (24) of the smoke outlet (14) is arranged and one Has valve ball (25), the low weight of which allows the valve ball (25) to be lifted out of the sealing seat (26; 26a) ^. Allowed by the flue gas flow 2. Boiler according to claim 1, characterized in that a grid-like or grate-like guide (27) in the neighborhood of the sealing seat (26) is provided and designed such that an upward movement of the valve ball (25) from the sealing seat (26) and a gas flow outside the guide are possible. 3. Boiler according to claim 1, characterized in that the The sealing seat (26a) is surrounded by a bearing surface (31), "whose radial extent is slightly smaller than that Diameter of the valve ball (25). 4. Boiler according to one of claims 1 to 3, characterized in that • ° · · · ι ι t * ° '° I Mil ι 11 net that in the flue gas outlet (14) downstream of the valve (23) a pressure sensor (29, 30) is provided for controlling the fuel supply when the pressure is increased in the flue gas outlet (14) is. Boiler according to one of Claims 1 to 4, characterized in that the burner (19) has a temperature sensor (22) is provided, which initially the burner fan (21) in operation sets, and that downstream of the valve (23) a pressure sensor (30) is connected to .en smoke exhaust (14), which opens the fuel supply above a certain pressure in the flue gas vent (14).