US2276934A

US2276934A - Combustion heating installation

Info

Publication number: US2276934A
Authority: US
Publication date: 1942-03-17
Anticipated expiration: 1959-03-17

Description

March 17, 1942. c. COLOMBI ET AL 3 9 COMBUSTION HEATING INSTALLATION Filed June 6, 1959 3 Sheets-Sheet 1 I/ a, hz-3@ 7770 77 ey March 17, 1942. I c. COLOMBI ETAL I COMBUSTION HEATING INSTALLATION 5 streets-Sheet 2 Filed June` e, 1939 23776 4 3' C 60702775 z` 9 %wo/777@ March 17, 1942. c. COLOMBI ETAL COMBUSTION HEATING INSTALLATION I .o- J

Patented Mar. 17, 1942 COMBUSTION HEATING INSTALLATION p Charles Colombi and Louis Monney, Lausanne, Switzerland, assignors to the firm Becomatic S. A., Genova, Switzerland, a firm of Switzerland Application June 6, 1939, Serial .Na. 271328 of 'the damper is a function of thegas temperature'.

A further object is the provision of a looking device which is adapted to keep the damper in closed position during the starting period of the combustion in spite of an -intense draft, aslo'ng as `the gas temperature has not reached a predetermined value which can be var-ied by adjusting the device.

These and other 'objects will be apparent from the following description and* claims,- reference being had to the accompanying `drawings wherem: i

'Figures 1 "and 2 are respectively -a schematic elevation and a plan view, partly in sec'tionof 'a first embodiment of the present invention;`

Figure 3 is an elevation of a second embodiment and Figures 4 and 5 are respective sections along lines4-4 and` 5-5 of Fig. 3.

Figure 6 is a plan view of a detail 'of thesecond embodiment.

The embodiment illustrated in Figures 1 and 2 comprises a chimney'flue l having a lateral aperture' 2 which communicates to 'the 'interior of a casing 3 having in one of its walls an 'aperture 4. A damper I oting in 'I and 8 on the casing 3 s adapted to close this aperture 4. On the lower portion of the aXle 6 is secured a lever 9 having two arms lo and ll. At thearm u a coil spring lZ is hooked in, the other end of which 'is fixed to a screw [3 engaged in a nut M integral with the wall oi the casing.

A-bimetal blade |5 extended within the flue l is secured on a bracket lBof the casing 3. The free end of this blade is hingedly connected with a rod ll which in turn by means of adeiormable member [8 is coupled with a second rod 19. This rod [9 which 's slidable in a 'bearing in the casing while being guided between four pins 21 fixed on the casing, carres at-'its enda cross piece '22 which cooperates `with the arm ll ofthe l'evera.

5 mounted on an axle E piv- Switzerland June, 15, 193& 4 Claims. gomat-93? "The operation of "the represented installation isthe following:

The damper '5 submitted to the action of the spring l 2 constantly tends to .close thevaperture 4. Assoon as a sufiic'ientdepression is created by the draft' in 'the flue, the damper opens against 'the action of the spring z for giving passage to a certain quantityof air. This opening of .the damper, however, is limited by `the cross piece 22 whereagainst thelever arm ll will ab ut; The position 'of the cross piece 'depends on the deformation of the bimetal .blade [5, in consequence -of the temperature of? the gases passingthrough the flue. When the .gas temperature increases, the blade grows longer in the upward direction? of .Fig.` 1,.the cross piece 22 moves'ofl the end of. the leverarm H and permits travel of this arm, and consequently an openingmotion .of the-damper 5, which is all the more. important .ias' the i gas temperature is more elevated. ;This travel limitation of the damper isviuse'fulcforthe case that'the depression in the fiuelissg'reat .and-.the temperature of thegases is` low, asit may happen during the ,starting of a boiler for instance, so that the damper can'- n'ot open and thedraft .is maintained ata maximum :until the .combustion has reached a desired stateythen the gases become :hot and 'the blade l'permitsthe opening of the damper 'for regulating ;the draft.

On th'e :other rsideif the depression in the flue reaches, onsaccourt of .atmospheric conditions, a valuemnearto zero and tends to become posi-' tive', the damper will be closed and will thus prevent any. flowing back of the gas into the room.

The 'valueofthe depression for which the damper begins to open can be regulated by the tension ?of ?the spring l2.

The spring' I'Z could bereplaced by a spiral spring, ;one 'end of which would be secured to theowall of theiscasing and ..the other end to the axleof thedamper. A

certain embodimentswherein the opening section of the.aperturemust be large, two dampers ;can be provided 'and symmetrically disposed with respect to the rod 19 and each shutting .an aperture'of ;the casing. The cross 'piece '22 provides in this case .two arms, each co-operating with. a lever mounted on the axle of each of 'the dampers .ina mannerthat a 'single bimetal blade l-5 is :adapted .to limit wsimultaneously the opening of the' two idampers.

`Thefdevice for the travel limitation 'of .the damperis Iarranged 'in a way to 'allow the theri mostatic :blade to 'freely bend 'under ;thei influthe interior' of the fiue 25 communicates; with the exteriorr side. A damper 33 is pivotally mountedin 34 and 35 on the frame tures 3 l.

which is closed. The gas temperature, therefore, must reach a higher value before the plate 52 disengages the damper than if the bimetal blade 41 would have been straight at the start. Consequently, it is possible by manipulating the regulating device to determine in advance the degree of the combustion at which the installation must work, and which will be indicated on the gradup ated scale 6l by means of the index 60.

If the flue 25 is of large dimensions, the rods 42 can beelongated by adjoining one or several rod istumpsiprovided with screw threads for being 29 for shutting the aper This damper constantly tends under" the effect of its own weight to close the apertures The underframe 21 provides atitslower' part V. an aperture 36, wherethrough passes a support 31. u;

which is secured to the frame 29 by means of bolts 38. The portion 39 of this support'extends' towards the interior of the flue and'its end 40 is rectangularly bent up and shows two' holes 4l wherein two parallel, cylindrical metal rods .42 can slide. Each of theserods which extend horizontally into the. flueand penetrate with their outer ends the support 31 through two holes 43,' is formed of two stumps provided with screw threads for being screwed together. Furthermore the outer end of thetwo rods 42 are secured together by means of a metal disc 44. The other, inner ends of the rods42 are fixed in a metal platec 45 whereon is mounted a thermostat 46 constituted by three

bimetal blades

41, 48 and 49, whereby 'the two latterser've as stifiening blades. The rectangularly'bent end 50 of the blade 41 is perforated and a metal rod ishooked therein. This rod 5! is threaded and screwed into a plate 52 which is fixed toan elastic metal blade 53 mounted in 54 on the support 31. The rod 5| is thus elastically guided for moving under the eflect of the deformation of the blade 41. The plate 52 co-operates with a nose 55 integral with the damper 33 in a way that a traction of the rod 5| upon the plate 52 determines the. closing of the damper. V u

The above mentioned 'disc 44 is provided with athreaded central bore whereth'ough is screwed a rod 56 disposed outside the flue and carrying a knurled button 51 at one end, while'the other end provides a neck 58 wherein is engaged a tappet 59 secured to the 'support 31 and preventing the rod 55 to be axially displaced. By turning the knurled button 51 the disc 44 is moved along the rod 56. e

The disc 44 carries an index 60 registering with a. scale Bl. on a piece 62 which is secured to the support 31. i i

At the starting of the heating installation the damper 33 is kept in closed position under the effect of the cold blade 41 which exerts a traction upon the plate 52. As soon as the temperature of the gases has reached a sufiicient value, the blade 41 bending towards the aperture 26 disengages the nose 55 and permits the damper to open over a certain angle under theinfluence of the depression within the flue for admitting atmospheric air in order to reduce the draft. u

The initial position of the blade 41 can be varied by .the displacement of the rods 42 in their guidngholes 4l and 43, which is obtained by turning the knurled button 51. An anti-clockwise rotation of this button displaces the rods' upwards in Fig. 4' and` the blade 41 bends because its end is keptstationary by means of 'the plate 52 bearing against the nose 55 of the 'damper 33:

scrwed together so that positioned in the blade 41 is always the neighbourhood of the center of the-flue.

The above described installations present the j advantage'of permitting the regulation of the draft .in the flue while eliminating every risk that the gasesfiow back into the rooms, which could happen 'by the existence of overpressure in the flu' due to, a sudden change of the atmospheric conditions. .v r

1. Draught regulator for-combustion heating installation, in combination with a flue having a lateral aperture for admission of atmosp'heric air, of a damper mounted on thefiue to more 'or less open said aperture under the influence of depressionexisting in the flue, a straight thermostatic blade disposed entirely within the flue to be-directly afiected by the temperature of the hotfiue gases, a rod movable along its axis and being mechanically connected at one of its extremities to the thermostatic blade, and a movable arresting member connected 'to the other extremityof said rod for limiting the distance of travel of the damper in `function oi the flue gas temperature. 2. Draught regulator for combustion` heating installation, in combinaton 'with a flue having a lateral aperture for admission of atmospheric air,

of a damper mounted on the fiue to more or less open said aperture under the influence of depressionexisting in the flue, a 'support displaceably mounted on the flue wall, a straight thermostatic blade disposed entirely within the flue to be directly afiected by the temperature of the hot flue gases said blade being secured to one end of said supportand extendingin a transverse direction with respect to the direction of displacement of said support, a rod movable along its axis and being mechanically co'nne'cted'at one of itsextremities to the thermostatic blade, .a movable arresting member connected to the other extremity'oi said rod for' limitingthe distance of travel of ;the damper in function of the flue'gas'temperature, and an Operating organoutsidethe flue and cooperatingwith the'other 'end of said support for displacing the same' on the flue wall with a View to modify at any time the position of the thermostatic blade ,andj to regulate, 'in this way, the acting temperatureof the flue' gases above which'the movable arresting member allows the damper to open'. i

3. Draught regulator for -combustion heating installation, -in combination with a flue having a lateral aperture for admission of atmospheric air, of a damper `pivotally mounted on the flue to more or less open said aperture under'the influence of depression existingin' the flue; a 'support on the flue wall comprisir'g twop'arallel slidable rods extending through said wall into the flue, a plate secured to the adjacent inrier ends of? said rods and a disc fixed to.`and connecting the :adjacent outer ends of said. rods a 'straight ther-t mostatic blade mounted upon; the :plate of said support within the flue to extend in a transverse direction with respect to the direction of displacement of said support while being entirely exposed to the temperature of the hot fiue gases, a rod movable along its axis and being mechanically connected at one of its extremities to the thermostatic blade, a movable arrestng member connected to the other extremity of said rod for limiting the distance of travel of the damper in function of the fiue gas temperature, and an Operating organ outside the fiue and cooperatng with the disc of the support for sliding said support on the fiue wall with a view to modify at any time the position of the thermostatic blade and to regulate, in this way, the actng temperature of the flue gases above which the movable arresting member allows the damper to open.

4. Draught regul ator according to claim 3,

wherein said Operating organ includes a threaded stern rotatably mounted in the flue wall and provided with a manpulatng button, and wherein the disc of said support is internally threaded to engage the external thread of said stern so that by turning the manipulating button the disc travels along said stern and entrains said support.

CHARLES COLOMBI. LOUIS MONNEY.