Patent ES-8501515-A1 (ES)
Title: Submerged burner heating unit
IPC: F24H1/20
Filed: 1983-09-29
Abstract: The heating installation performance is improved by maintaining the flow of ventilating air for a period after the burner has been turned off, ensuring the cooling of the combustion chamber walls to below 100 degrees C. - The installation comprises a burner (1), a submerged combustion chamber (3), a fuel supply, a combustion air supply driven by a fan (7), an automatic spark ignition (11), and a controller (6) which commands fuel supply and ignition. The operation of the air supply fan (7) is independently controlled by a timer  relay which sets up the air flow before the controller (6) is activated and maintains the air flow after the burner has been stopped.  (1/2) EPAB- EP-135639 B 1. Plant of the type comprising at least one burner (1) having a submerged combustion chamber (3), a fuel intake, an intake for combustion air pressurised by a blower (7) or the like and operated as soon as the plant is switched on by means of a start/stop button (29) an automatic lighting device comprising sparking means (11) or the like, a programmer (6) which successively and at the appropriate moments commands an air-scavenging of the plant, the arrival of fuel, ignition of the burner and stoppage of the fuel supply, the said plant being characterised in that: the blower (7) is directly supplied by the circuit (21) for switching on the plant and is controlled by means of a delayed action relay (19) which is itself energised by the said circuit (21) via the start/stop button for operating the plant; and in that it comprises in parallel with the intake of combustion air (29) to the burner (1) a branching circuit (22) which blows air over the spark plugs (11) of the like and which is operated by an electrically operated valve (23) via a delayed action relay (25) energised by the programmer (6), the time lag corresponding substantially to the time required for air-scavenging of the plant prior to the arrival of fuel and ignition of the burner. (6pp) - EP-135639 B 1. Plant of the type comprising at least one burner (1) having a submerged combustion chamber (3), a fuel intake, an intake for combustion air pressurised by a blower (7) or the like and operated as soon as the plant is switched on by means of a start/stop button (29) an automatic lighting device comprising sparking means (11) or the like, a programmer (6) which successively and at the appropriate moments commands an air-scavenging of the plant, the arrival of fuel, ignition of the burner and stoppage of the fuel supply, the said plant being characterised in that: the blower (7) is directly supplied by the circuit (21) for switching on the plant and is controlled by means of a delayed action relay (19) which is itself energised by the said circuit (21) via the start/stop button for operating the plant; and in that it comprises in parallel with the intake of combustion air (29) to the burner (1) a branching circuit (22) which blows air over the spark plugs (11) of the like and which is operated by an electrically operated valve (23) via a delayed action relay (25) energised by the programmer (6), the time lag corresponding substantially to the time required for air-scavenging of the plant prior to the arrival of fuel and ignition of the burner. (6pp) USAB- US4488537 A The installation comprises a jet or other burner producing a vertical flame extending downwards into a chamber comprising the combustion chamber and having a metal wall in one or more layers. - The combustion product or gases escape in the form of bubbles through holes at the bottom of chamber directly into a bath to be heated. - The operating cycle (ignition and extinction) of the burner is controlled by a programmer. The latter controls a combustion air fan, checks that the air and gas pressures are suitable, and sends an ignition command via a h.v. transformer to an ignition spark plug. The programmer also gives command to solenoid valves for air and gas and checks the presence of a flame via a detector.