FI74330C - TILLAEGGSANORDNING TILL EN OLJEBRAENNARE FOER ALSTRING AV ELEKTRISK STROEM. - Google Patents

Description

! 74330

Accessory for oil burner to generate electricity. This account is based on the requirements for the electrical circuit.

The invention relates to an accessory to an oil burner for generating the electric current required by a pump motor and other electrical auxiliaries, so that the burner can operate with the electric current generated by itself without the need for an external electrical source such as a general electricity distribution network.

The use of known oil burners is limited by the fact that the pump motor and other auxiliary devices require mains electricity. However, an oil burner would have use as a source of both heating and cooling energy in many areas where no electricity is available. For example, in sparsely populated areas of the north, a heat source is needed for temporary residence for work or military purposes. In warm developing countries, an energy source for refrigeration equipment is needed, for example, to cool drug stocks.

According to the invention, the above-mentioned problem is solved by arranging an impeller on the shaft of the pump motor, the compressed air of which as it rotates is led by a pipe to the gas turbine rotating the generator and by a separate nitrogen tank that nitrogen or other inert gas expanded in the heat of the furnace accelerates the velocity of the air flow by the action of the injector.

The generator is used to charge batteries or accumulators which, via an inverter, supply an alternating voltage corresponding to the mains electricity. Depending on the dimensioning and efficiency of the accessory, the electrical current it generates may be sufficient for applications other than the operation of the oil burner electrical equipment, eg for the cooling coil fan motor (max. 50 W).

2 74330

In the following, an embodiment of the invention will be illustrated with reference to the accompanying drawings, in which Fig. 1 shows a general diagram of an accessory according to the invention and Fig. 2 schematically shows a section of an oil burner.

In the oil burner according to Fig. 2, the motor 1 rotates a fan 3 and an oil pump 4 via a shaft 2, which supply air and oil to the mixer 5. The air intake duct 6 terminates in a cavity formed inside the wings of the fan 3.

Threads 7 are made on the shaft 2 (practically on the plastic sleeve surrounding the shaft 2) and the impeller 8, 11 is arranged freely rotatably around the threaded part 7 via a hub 9 provided with a corresponding internal thread. When the motor 1 stops, the impeller 8, 11 with its hubs 9 continues to rotate, whereby the impeller moves to the right due to the thread 7 in the figure and closes the air duct 6. When the motor 1 starts, the impeller 8, 11 does not immediately reach the same rotation speed. Due to the relative rotation between, the impeller 8, 11 moves from left to right in the figure, i.e. to the position shown in the drawing, opening the air duct 6. A stop pin 10 is placed in the thread 7.

As the motor 1 continues to run into the wheel while the burner is running, the impeller blades 11 push air into the tube 12. An automatic non-return valve 13 prevents air from returning to the impeller chamber.

As shown in Figure 1, the tube 12 is passed through a furnace 14, whereby the flame heats the air in the tube, which expands with increasing flow rate.

The device also includes a reservoir 20 of 3 74330 gases which expand strongly in heat. A suitable gas is, for example, nitrogen, the expansion of which in heat is many times that of air. Nitrogen gas is supplied from the liquid nitrogen bottle 20 via a pipe 21 to an intermediate tank 22, where the expanded and pressurized nitrogen gas is introduced into the air pipe 12 by an injector 23 so that the nitrogen flow accelerates the air flow rate by the injector action. Ts. the pipe 12 introduces the required mass of gas, which is given a sufficient flow rate by the injector effect of the nitrogen flow discharged at high pressure and velocity.

The flowing gas mixture is led to a gas turbine 15, from which the exiting mixture is returned by a pipe 24 back to the rear end of the combustion chamber for the afterburning of the gases in the tip area of the flame.

Since the gas turbine 15 has a very high rotational speed, e.g. 5000 rpm, the rotational speed is reduced, e.g. by a ball bearing-planetary gear 16, to a rotational speed of about 1000 rpm. Connected to the output shaft of the gearbox 16 is, for example, a 600 W charger 17 which charges the batteries 18. The batteries 18 run the oil burner motor 1 (65 - 120 W) via the inverter 19, in addition to which there is sufficient electric current for oil preheating and oil burner control devices (maximum 200 W ). The test device corresponding to the structure and operating principle described above has functioned properly.

Claims (5)

Auxiliary device for generating the electric current required by a pump motor (1) and other electrical auxiliaries for an oil burner, characterized in that an impeller (8, 11) is arranged on the shaft (2) of the pump motor (1). ) to a rotating gas turbine (15) and that a pipe (21) is led from a separate nitrogen tank (20) or other inert gas tank through the furnace (14) and connected before the gas turbine (15) to the air pipe (12) by an injector so that nitrogen or other the inert gas accelerates the velocity of the air flow by the injection effect. Auxiliary device according to Claim 1, characterized in that the air pipe (12) from the impeller (8, 11) to the turbine (15) is also guided through the furnace (14). Auxiliary device according to Claim 1 or 2, characterized in that the degassing pipe (24) of the gas turbine (15) is led to the rear end of the furnace (14) for post-combustion of gases in the flame tip region. Auxiliary device according to one of Claims 1 to 3, characterized in that the impeller (8, 11) is arranged on the pump shaft (2) to move axially on the threads (7) so that the impeller (8, 11) operates in a manner known per se from the burner air intake (6). ) to close and open automatically when the burner stops and starts. 4,74330 Auxiliary device according to Claim 1, characterized in that the furnace (14) has a small intermediate tank (22) for the expansion of nitrogen gas.