Abstract:
With a combustion device and corresponding method for low-NOx and low-CO combustion, with largely separate feeds of fuel (4) and combustion air (5) to the combustion chamber, the entire or the greatest part of the combustion air is fed to the combustion chamber (2) in continuous gradation over numerous points in the chamber.
Abstract:
Process for providing a theoretical value of an adjusting, respectively control device for the outgoing temperature of a heating installation as a function of the outside temperature. Such theoretical values are normally provided to the regulator in the form of heating curves. The heating curves are non-linear relationships and it is difficult for a regulator to process them as such. Owing to this invention the curve is fractionated into two straight lines of different slopes which meet at a common point. Said point is situated where the relationship between the heating curve and the linear relationship reaches a maximum with respect to the outer temperature.
Abstract:
Process for controlling the power of an electric through-flow heater in a three-phase system at a rated voltage of 21 kW and a minimum power of 3,5 kW, in which the controllable powers PR, 2PR, 4PR (where PR = 1 kW) are connected between two outer leads L1, L2, and in which further connectable power supplies are available in such a way that there is a symmetrical distribution. To avoid unacceptable mains reactions on the outer leads when these power supplies are switched on, the controllable power supplies are switched on simultaneously and in a mutually opposed manner.
Abstract:
A premix gas burner with at least one gas jet arranged on a pipe conveying the burner gas and at least one mixing pipe, the inlet section of which, which tapers towards the burner, is arranged at a distance from the gas jet, whereby the gas jet has an annular jet aperture. In order to be able in such a burner to maintain the mixing ratio between burner gas and primary air largely constant over the entire load and operating range, at the centre of the gas jet (8) there is a truncated cone (51), the tapered end of which is directed towards a pipe (10) supplying the gas jet (8), and the outer casing surface of the annular gap of the gas jet (8) widens towards its free end.
Abstract:
Electric water heater comprising an accumulator (3) and an instantaneous water heater (5) having each electric heating resistances (21 to 23, 12 to 14), as well as a temperature regulator (11). In order to obtain a power control for the unit comprised of the accumulator and the instantaneous water heater, avoiding the transmission of parasitic pulses to the electric power supply network, the temperature regulator (11) switches to the accumulator (3) the portion of electric power which has not been used by the instantaneous water heater (5). It is thus possible to precisely dose the power to be provided to the instantaneous water heater (5), the portion of such power not absorbed by the instantaneous water heater being provided to the accumulator (3). This installation operates without feed-back for the power supply network. The invention may be used for the preparation of sanitary water.
Abstract:
Process for producing a double-walled heating duct (1) of a burner-heated hot-water generator in which the inner and outer casings (2 and 3) of the heating duct (1) are closely joined at the edge regions and said duct (1) is fitted with connecting pipes for the supply and discharge of a heating medium flowing through it. To enable such a heating duct to be easily produced, only shaping process are used and the inner and outer casings (2, 3) have edge recesses cut in them which are put together in their edge regions with the interposition of a seal, preferably a toroidal sealing ring (10), and then secured together by bending so as to provide mutual engagement.
Abstract:
The pulse counter circuit comprises an oscillator (1) of which the frequency is controlled by a probe, a constant frequency oscillator (13), a gate circuit (16) and a pulse counter (18). Such pulse counter circuits find application to flow measurements, particularly for calorimetric measurements. The aim is to provide a counter circuit allowing an accurate counting of the pulses during a predetermined period while being considerably less costly than the devices used heretofore. The solution is provided by transmitting the output voltage (5) of the pulses from the frequency controlled oscillator (1) through a period discriminator (8) to the gate circuit (16) and by coupling the other input of the gate circuit to the output (14) of the constant frequency oscillator (13).
Abstract:
A double-walled heating section with a heat exchanger for a burner-heated circulatory or through-flow water heater with at least one finned tube contained in a heating section in the form of a water-filled double-walled section in which the burner is fitted, whereby the finned tube is connected in series with the double-walled section on the water side and arranged in the upper region of the double-walled section. In order to ensure that any gas bubbles occurring are reliably removed in such a heat exchanger, the finned tube (4) is surrounded by extensions (2) of the double-walled section (1) only on two opposite sides lying in the extension of the fins (5) of the fined tube (4), said extensions (2) communicating with a further water pipe, and an outward or return pipe being connected to one of the extensions (2).
Abstract:
Process for enamelling the inner surface of a hollow body to which an enamel layer has been deposited. The drying of the enamel layer is carried out under vacuum with application of heat. The dried enamel layer is finally fired in a conventional way. The process is particularly applicable to the enamelling of gas operated water boilers.
Abstract:
Nozzle burner for a boiler with a nozzle housing wherein, on one side, the nozzle (5) is provided with a control motor and wherefrom, on the other side, the fire tube (11) of the burner (4) comes out, wherein the motor and the fire tube (11) form, on the side opposite to the nozzle housing (17), projecting parts, wherein the rear portion (16) of the fire tube (11) exceeds the back side (28) facing the control motor of the nozzle (5) and wherein the rear portion (16) of the fire tube (11) rises in a covering cap (22) of the nozzle housing. The burner (4) is provided with a pressure regulator (126) of which the measured magnitude represents the air pressure in the inside (132) of the fire tube (103) and of which the regulating variable (11) represents the rotation speed of the nozzle. The nozzle burner is further provided with a sound damping device.