FR2499689A1 - Central heating boiler for solid fuel - has spiral heating coil above boiler furnace also extending around flue - Google Patents

Abstract

The boiler consists of a frame (1) supporting the refractory lining (2) and having an air inlet (5). The air rises through a vertical, perforated tube (7). Products of combustion pass from the furnace, through a duct (11) into the flue pipe (15). The entry to the duct is baffled by a plate (13) suspended on four angles. The heating coil (10) is located over the furnace and is a spiral which also extends vertically around the flue duct. The whole boiler is encased in an enclosure (19) with a cover (17).

Description

 The present invention relates to boilers for heating radiators installed in different rooms of a home.

 In known devices of this kind, there are longitudinal boilers, more particularly intended for long logs of wood. These boilers are designed to receive large pieces of wood in order to allow a great autonomy of heating.

 The boiler object of the present application is intended more particularly for burning small fuels such as chips, sawdust, etc., but it can receive pieces of wood. Its design makes it possible to efficiently orient the heat released on the receiving elements and also to obtain a long heating autonomy.

 The device which is the subject of the present invention can be divided into two parts: the hearth with its adjustment elements and the heat receiving part.

 Within a vertical frame of variable shape, refractory bricks are positioned so as to surround the hearth proper, forming thermal insulation for the vertical walls.

 An air intake coming from the center of the base of the hearth, through the ashtray, regulates the combustion of sawdust in the boiler.

 Above the refractory bricks a sheet covers the hearth and is secured by its periphery to the frame in a hermetic manner. This sheet having great qualities of thermal conductivity, has an opening in its center around which is positioned a tube forming a horizontal coil.

Said central opening is surmounted by a flue ducting. At the base of the central duct is placed a plate which directs the flames under the conductive sheet thus transmitting heat to the coil. An asbestos plate covers the coil so as to conserve heat in the boiler enclosure.

 The accompanying drawings illustrate by way of nonlimiting example an embodiment of the device according to the present invention.

 Figure 1 shows a vertical section of the boiler.

 FIG. 2 represents a horizontal section of the boiler along the axis AA shown in FIG. 1.

 FIG. 3 represents, on a different scale, a horizontal section of the boiler along the axis BB shown in FIG. 1.

 Figure 4 shows, on another scale, a top view of the plate orienting the flames.

 FIG. 5 represents, on another scale in vertical median section, the plate orienting the flames on the duct.

 Figure 6 shows a fuel aerator.

 FIG. 7 represents, in vertical section, a variant design of the boiler.

 As shown in Figures 1, 2, 3, 4, 5 and 6, the boiler comprises a circular frame 1 containing bricks 2 refractories forming a circle concentric with the frame 1. The bricks 2 are bevelled on their ends 3 vertical so as to adjust them and immobilize them naturally.

 The bricks 2 rest on a horizontal plate 4 secured to the chassis 1 and having an opening 5 in its center, allowing the entry of air for combustion. The air circulation takes place through the ashtray 6 and goes up through the chimney of an aerator 7 which is formed of a vertical circular grid preferably made of a heat-resistant alloy. The aerator 7 immobilized by its base 8 on the plate 4 is removable at will and its upper end is capped with a small plate 18 stopping the flames. The top of the hearth is covered with a plate 9 which carries a horizontal copper coil 10 extending vertically around the duct 11 channeling the smoke.

 The duct 11 is provided at its base with an inner rim 12 on which a circular plate 13 rests by brackets 14 and carries in the upper part a cover 16. A smoke pipe 15 has its lower end fixed on the duct 11. The boiler is covered by a plate 17 and is surrounded by a protective body 19 over its entire height.

 According to the design variant represented in FIG. 7, the lower plate 20 of the hearth has a central opening 5 and is raised around this opening 5, developing obliquely up to the bricks 2 so as to form a central curvature to cause the descent from sawdust to the aerator 7. Under the central opening 5 and at its periphery are fixed brackets 21 supporting the aerator 7. To reduce the heat losses, the coil 10 may be covered with an insulating material 22.

 The present invention is more particularly intended for heating individual houses and pavilions.

Claims (8)

1) Boiler for heating individual house radiators  dual, with wood-derived fuels, such as  sawdust or shavings, characterized in that refractory bricks  shutters are assembled and juxtaposed to the interior wall  -from a circular and vertical frame and rest on a  support plate having a central opening; in that  a second horizontal plate is fixed above the bri  refractory, on which is positioned a tube for  mant a horizontal coil. 2) Device according to claim 1, characterized in that  refractory bricks are bevelled at two ends  so as to be assembled and immobilized naturally. 3) Device according to claims 1 and 2, characterized in  what the refractory bricks forming a concentric circle  that of the frame, surround the hearth proper over all  his height. 4) Device according to claim 1, characterized in that  according to a variant, the bottom plate of the hearth is raised  around its central opening, developing obliquely  down to the refractory bricks. 5) Device according to claim 1, characterized in that a  second plate secured to the chassis, covers the bricks  refractory and partially the hearth. 6) Device according to claim 5, characterized in that  the plate directly covering the refractory bricks,  has a central opening supporting a conduit. 7) Device according to claims 5 and 6, characterized in  what the plate directly carries a horizontal coil  extending around the central duct. 8) Device according to claims 1 and 4, characterized in  that the support plate carries a vertical aerator on its  central opening.