FR2777982A1 - Fireplace with insert for gas burning - Google Patents

Abstract

An enclosed fireplace adapted to burn gas has an insert fitted behind a glass panel with artificial logs, surmounted by a throat. The upper section (4) of the throat has a transverse horizontal panel with gaps at both sides and a chicane above it formed by two or more inclined panels (40, 41, 42) offset relative to one another in the horizontal plane. The plates reduce successively in width in an upward direction; the lower plate is set at 8 -11 degrees to the horizontal, and those above it are at 1.5 to 3.5 degrees to the lower plate.

Description

The present invention relates to a chimney device with

gas insert.

  Gas insert chimney devices are already known, which comprise, in an enclosure closed at the front by a glass door and taking place in the hearth of a chimney, a gas burner associated with logs produced in a non-combustible material. The purpose of these devices is to provide the advantages of the conviviality and the aesthetics of a wood fire, while alleviating

the disadvantages of these.

  Indeed, a traditional wood fireplace has the following disadvantages, in addition to the need for frequent manual fuel supply, tedious maintenance with regard to

  including removal of ashes and cleaning of the hearth.

  In addition, a conventional type chimney, due to incomplete combustion and therefore fouling of the exhaust ducts, can present risks of chimney fire

  when it is not regularly maintained.

  There are known gas insert chimney devices which make it possible to overcome these various drawbacks, by managing to create large yellow flames giving the appearance of a fire.

classic wood.

  In these devices, this object is achieved by limiting the supply of oxidant, namely air, so that combustion is incomplete, which is however controlled so as not to have the drawbacks of wood fire, in particular

1 fouling.

  In practice, the burner has a specific architecture, and the interior volume of the insert is managed in a particular way, in particular by limiting the opening through which are

  exhaust the combustion gases in the exhaust duct.

  Existing chimney devices operating on this principle, however, have the disadvantage of favoring the aesthetic side to the heat output, so that these chimney devices do not allow the recovery of calories, and that a large part of these is rejected. in the exhaust duct. On the other hand, all gas insert chimneys of this type are equipped with a draft-cutting device making it possible, in the event of abnormal operation such as a backflow, to prevent the return of the combustion products in 1 insert by evacuating them

in the environment.

  However, a draft-cutting device must not limit the draft by natural convection during normal operation of the chimney, that is to say it must allow the evacuation of all of the combustion products and not reject in

  permanently a part in the ambient environment.

  On the other hand, the draft-cutting device must not be an obstacle to managing the interior volume of the fireplace, and must allow the speed of evacuation of the combustion products to be lowered in order to recover the calories. . However, existing gas insert chimney devices, equipped with a

  draft hoods do not achieve this goal.

  The object of the present invention is to remedy these various drawbacks by proposing a gas insert chimney device which, while allowing perfect management of the interior volume of said insert, and allowing, by incomplete combustion, the obtaining of yellow flames giving the appearance of a wood fire,

  improves the heat output.

  Unless otherwise specified, the terms "front", "rear", "upper", "lower" are used with reference to

  an observer looking at the chimney and standing in front of it

  this. The gas insert chimney device according to the invention is essentially characterized in that it comprises a hood-type draft hood comprising, below, a sleeve for connection to the insert, above a sleeve for connection to the exhaust duct. combustion products, and between said sleeves means for deflecting to the ambient environment of said combustion products in the event of abnormal operation; and in that the lower connection sleeve is partially closed by a horizontal plate positioned in its middle region, so as to

leave two openings.

  The horizontal plate is intended to lower the speed of exit of the combustion products by deflecting them. According to an additional characteristic of the device according to the invention, the horizontal plate represents between 45 and 65% of the

  surface of the opening of the lower connection sleeve.

  According to another additional characteristic of the device according to the invention, the means for deflecting the combustion products consists of a plate inclined downwards, from rear to front, interposed between the lower and upper sleeves in the middle region of the draft hood, while a transverse opening is made in front of the bottom wall of the draft hood and allows communication

  the interior of it with the surrounding environment.

  The inclined plate makes it possible to deflect the combustion products into the ambient environment during a possible backflow phenomenon, without however hampering the evacuation thereof during a

normal running.

  The gas insert chimney device according to the invention

  also includes a drain arranged between the insert and the cutter

  draft, in order to recover the calories from the combustion products. According to another additional characteristic of the device according to the invention, the hood comprises on the one hand, a plate arranged horizontally across its opening for evacuating the combustion products, in the median region thereof; and on the other hand, above said plate, a baffle formed of at least two plates inclined with respect to the horizontal and offset from one another in the opposite direction to that of

1 tilt.

  The horizontal plate is intended to lower the speed of exit of the combustion products and to maintain a certain pressure in the insert, while the baffle also makes it possible to slow down the exit of said combustion products, which can then transmit their heat energy to said plates which is transmitted by conduction to the heat transfer fluid, namely air

surrounding the insert.

  According to another additional characteristic of the device according to the invention, the horizontal plate is arranged in the opening so as to leave two openings, one at the front and the other at the rear, while the plates of the

  baffles are inclined downwards from the front to the rear.

  According to another additional characteristic of the device according to the invention, the angle of inclination relative to the horizontal of a baffle plate is greater than that

from the next lower plate.

  According to a particular embodiment of the device according to the invention, the lower plate makes an angle of between 8 and 11, while the angular difference between two adjacent plates is

between 1.5 and 3.5.

  According to the invention, the chute has two superimposed parts, each narrowing from the bottom to the top, the lower part enclosing the horizontal plate, while the

  upper part contains the chicane.

  The advantages and characteristics of the device according to

  the invention will emerge more clearly from the description which

  follows and which relates to the attached drawing, which represents one

nonlimiting embodiment.

  In the accompanying drawing: - Figure 1 shows a perspective view of a device

  fireplace insert gas according to the invention.

  - Figure 2 shows a plan view of an interior element

of part of the same device.

  - Figure 3 shows a side view of an interior element

  from another part of the same device.

  - Figure 4 shows a partial perspective view of

face of the same interior element.

2777982

  - Figure 5 shows an elevational view of another

part of the same device.

  - Figure 6 shows a side view of the same part.

  - Figure 7 shows a bottom view of the same part.

  If we refer to Figure 1 we can see that a chimney device according to the invention comprises an insert 1 comprising an enclosure 10 closed at the front by a glass door 11, and inside which are arranged logs 12 made of a non-combustible material, while a burner, not visible, allows, by incomplete combustion, 1 obtaining large

  yellow flames giving the appearance of a wood fire.

  The enclosure i is surmounted by a drain 2 comprising two superimposed parts, a lower part 3 of small height going sharply upwards, and an upper part 4, of greater height going narrower

faintly upward.

  On the other hand, the drain 2 is surmounted by a draft hood 5 in the form of a hood, which comprises an upper sleeve 50 allowing connection to a discharge duct, not shown, and a lower sleeve 51 leaving a space between drain 2

and the draft cutter 5.

  If we now refer to FIG. 2, we can see that the lower part 3 of the drain 2 has in its opening 30 a plate 31 placed horizontally in the middle region of this opening 30, and at a certain distance from the front edges 32 and rear 33 of the lower part 3, so as to provide

openings 34 and 35.

  The plate 31 is arranged above the hearth, so as to prevent a direct exit of the combustion products and heat, which are deflected towards the openings 34 and 35, and thus slowed down. The plate 31 also makes it possible to maintain a certain pressure inside the hearth, which promotes, obtaining a

  incomplete combustion, however linked to the design of the burner.

  If we now refer to Figures 3 and 4, we can see that the upper part 4 of the inlet 2 contains a baffle composed of three superimposed plates 40, 41 and 42, respectively from the bottom

to the top.

  These three plates 40, 41 and 42 are held together by means of two tabs 43 and 44 intended to be secured to the body 45 of part 4, not shown but visible in FIG. 1, the tab 43 being secured to the front wall of the body 45 while the tab 44 is secured to the wall

back of it.

  The plates are inclined relative to the horizontal downwards from the front to the rear, that is to say from the tab 43 towards the

tab 44.

  The inclination relative to the horizontal of the intermediate plate 41 is greater than that of the lower plate

  , but smaller than that of the upper plate 42.

  In the preferred embodiment shown, the plates 40, 41 and 42 form an angle with respect to the horizontal

  9.5, 12 and 14.5 respectively.

  On the other hand, as can be seen in FIG. 4, the plates 40, 41 and 42 are offset in the transverse direction, with

  know in the opposite direction to that of tilt.

  The plates 40, 41 and 42 are thus each in contact with only one of the side walls 46 and 47 of the body 45, and this alternately. Thus the lower 40 and upper 42 plates are in contact with the side wall 47, while the intermediate plate 41 is in contact with the side wall 46,

way to create a chicane.

  This baffle makes it possible to slow down the products of combustion, and to the plates 40, 41 and 42 to store the heat which is transmitted to the body 45, and thus to the heat transfer fluid which constitutes the ambient medium. If we now refer to Figures 5, 6 and 7, we can see

the design of the draft cutter 5.

  The draft hood 5 is in the form of a hood, that is to say it essentially has a horizontal bottom wall 52, a vertical rear wall 53, a front wall 54 inclined downwards from the rear towards the front, and two side walls 55 and 56 inclined towards one another. The upper sleeve 50 connects the front 54 and side walls 55 and 56 to an unrepresented exhaust duct, while the lower sleeve 51 is integral with the lower wall 52 and connects the draft hood 5 to part 4 of the outlet 2,

also not shown.

  The draft hood has internally in its median region a plate 57, integral only with the rear wall 53, inclined downwards from the rear towards the front, and interposed

  between the upper 50 and lower 51 sleeves.

  The plate 57 is small, which is however sufficient to cut the fictitious cylinder joining the sleeve

  upper 50 to lower sleeve 51.

  On the other hand, the front edge 520 of the bottom wall 52 is not integral with the front wall 54, so as to create an opening 58. In addition, as can be seen in FIG. 7, the opening 510 of the lower sleeve 51 is partially closed by a plate 59, disposed in the median region of the opening 510, so as to allow two openings to remain laterally on either side

590 and 591.

  The plate 59 constitutes a baffle making it possible to slow down the exit of the products of combustion, and therefore to lower their

  temperature, to avoid overheating of the exhaust duct.

  According to a preferred embodiment, allowing an optimal yield of the draft cutter, the plate 59 represents 56% of

the surface of the opening 510.

  It will be noted that, advantageously, the gas insert chimney device according to the invention comprises a thermocouple allowing

  to inhibit the gas supply in the event of overheating.

  During normal operation of the chimney, the combustion products, by natural convection, pass through the openings 590 and 591, then bypass the inclined plate 57, finally, guided by the front walls 54 and side 55 and 56, they are extracted by the exhaust duct, not shown. Due to the size of the inclined plate 57, it does not constitute an obstacle to the combustion products, which thus do not risk spreading in the ambient medium passing through

1 opening 58.

  In the case of abnormal operation, such as a plunging gust of wind, causing the combustion products to flow back, they cannot reach the hearth by being directed by the

  plate 57 towards the ambient environment through the opening 58.

  The draft cutter 5 has the advantage of being placed in the extension of the drain 2, which simplifies the design of the assembly compared to the existing draft cutters,

  and promotes the performance of the chimney.

  Although the invention has been described with reference to a particular embodiment, it is understood that it is in no way limited thereto and that it is possible to make various modifications to the forms, materials and combinations of these. various elements,

  without departing from the scope and spirit of the invention.

Claims (9)

  1) Chimney device with gas insert making it possible to obtain yellow flames giving the appearance of a wood fire, characterized in that it comprises a draft hood (5) in the form of a hood comprising below a sleeve ( 51) for connection to the insert (1), above a sleeve (50) for connection to the combustion products evacuation duct, and between said sleeves a means of deflection towards the ambient environment of said combustion products in the event of operation unnatural; and in that the lower connection sleeve (51) is partially closed by a horizontal plate (59) positioned in its middle region, so as to leave two openings (590, 591).   2) Device according to claim 1, characterized in that the horizontal plate (59) represents between 45 and 65% of the surface   of the opening (510) of the lower connection sleeve (51).   3) Device according to claim 1 or claim 2, characterized in that the means for deflecting the combustion products consists of a plate (57), inclined downwards from the rear towards the front, secured only to the wall rear (53) of the draft cutter (5), and interposed in the median region of the latter (5), between said sleeves (50, 51), while a transverse opening (58) is made in front of the wall lower (52) of said draft cutter (5) in order to communicate   the interior of it with the surrounding environment.   4) Device according to any one of claims   previous characterized in that a drain (2) is interposed between   the draft cutter (5) and the insert (1).   5) Device according to claim 4, characterized in that the drain (2) comprises on the one hand, a plate (31) disposed horizontally across its opening (30) for evacuating combustion products, in the region median thereof; and on the other hand, above said plate (31), a baffle formed by at least two plates (40, 41, 42) inclined relative to the horizontal and offset from each other in the sense opposite to that of the tilt.   6) Device according to claim 5, characterized in that the horizontal plate (31) is arranged in the opening so as to leave two openings (34, 35), one at the front and the other at the rear, while the plates (40, 41, 42) of the   baffles are inclined downwards from the front to the rear.   7) Device according to claim 5 or claim 6, characterized in that the angle of inclination relative to the horizontal of a plate of the baffle is greater than that from the next lower plate.   8) Device according to claim 7, characterized in that the lower plate (40) makes an angle between 8 and 11, while the angular difference between two adjacent plates is between 1.5 and 3.5.   9) Device according to any one of claims 5 to 8,   characterized in that the baffle has three plates (40, 41, 42).   ) Device according to any one of claims 5 to 9,   characterized in that the drain (2) has two superimposed parts (3, 4), each narrowing from the bottom up, the lower part (3) enclosing the horizontal plate, while   the upper part (4) contains the chicane.