WO2021006829A1

WO2021006829A1 - Burner assembly for a gas cooking device

Info

Publication number: WO2021006829A1
Application number: PCT/TR2019/050556
Authority: WO
Inventors: Ali Erkan MAMUR
Original assignee: Femas Metal San. Ve Tic. A.S.
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2021-01-14
Also published as: EP3980687A1; EP3980687A4

Abstract

The invention is related to a burner assembly for a cooking device comprising a peripheral wall (12) having a gas inlet (14) to supply combustion gas by an injector disposed in a horizontal or narrow angle position and a base (10) at least partly confined by the peripheral wall (12) and a venturi element (17) adjacent to a mixing chamber (16) accessed by the gas inlet (14) extending along the base (10); a flame distributor (30) transferring gas air mixture provided from the base (10) by means of a corresponding distribution channel (23) by supplying from mixing chamber (16) and circumferentially discharges air gas mixture from multiple slits (32). The burner assembly further comprises at least one air inlet (18) which is provided directly at the peripheral wall (12) and supply ambient air from the base (10) such that composing air-gas mixture with combustion gas by accessing to the mixing chamber (16).

Description

BURNER ASSEMBLY FOR A GAS COOKING DEVICE

TECHNICAL FIELD

Present invention relates to burner assembly having a venturi element utilized on a gas cooking device and provide a gas and air mixture.

PRIOR ART

Gas burners having rings one inside the other has a circular inner part and circular outer part with a passage therebetween are used on a cooker. A high-power burner comprises a flame distributor composing two combustion rings one inside the other, and an air supply channel extending above the top plate so that disposed between the flame distributor and a base in a receptacle form assembled to the top plate from below. An air gas mixture is completed by the air supplied to the base by passing through a venturi element and subsequently is transferred to the flame distributor from channels disposed on body.

In some embodiments wherein the air is supplied from the top plate, the high quantity air flow directed to the venturi channel bends the flame crown down so that limiting the volume of the air and therefore power generated by the burner. In another embodiment, the air is provided below the base. In such cases, particularly at the burners disposed on the hobs of the stand alone products, the flame flickering problem occurs when the door of the cooking chamber is opened and closed in a swift manner and middle burner may even cut the flame. Primary source of problem is affecting primary air flow used to combustion by instant low pressure during opening the door of the oven and instant high-pressure during closing. Furthermore, side components such as cooling fan located at the area where the burner is disposed also causes same problems.

EP1781989B1 patent discloses a high-performance burner assembly for gas cooking. Herewith, a multiple rings gas burner to be installed on a hob, with flames distributed over a substantially circular inner portion and over an outer portion of a flame divider, the circular inner portion and the outer portion separated by an annular secondary air cavity, it presents a single gas inlet in communication with at least one injector disposed horizontally, with said at least one injector there is associated a venturi conduit of linear extension disposed horizontally, the primary air required for burner operation comes from the top external to the hob, the secondary air required for burner operation comes from the top external to the hob, the air/gas mixture is supplied to both the outer and circular inner portion of the flame divider via the same linear venturi conduit is disclosed.

BRIEF DESCRIPTION OF THE INVENTION

Object of the invention is providing a compact burner design for cooking appliances.

In order to achieve above objective, the invention relates to a burner assembly for a cooking device comprising a peripheral wall having a gas inlet to supply combustion gas by an injector assembled in a horizontal or narrow angle position and a base at least partly confined by peripheral wall and a venturi element adjacent to a mixing chamber accessed by the gas inlet is extending along the base; a flame distributor transferring gas air mixture provided from the base by means of a corresponding distribution channel by supplying from mixing chamber and discharges air gas mixture from multiple slits circumferentially. Additionally, invention comprises at least one air inlet provided directly at the peripheral wall and supply ambient air from the base such that composing air gas mixture with combustion gas by accessing to the mixing chamber. A simple and effective burner assembly is provided by obtaining the air from the ambient for the mixture directly through the peripheral wall near the base. It is also achieved to obtain required power amount without using additional measure rendering a complex burner assembly design. Additionally, due to the air inlet is disposed at the bottom, the burner flame is unaffected from disturbing air flows composed at the outer part of the gas cooker where the burner assembly is disposed.

In a preferred embodiment of the invention, the air inlet is provided adjacent to the gas inlet. By this means, the ambient air entering to the bottom body is provided by making use of low pressure at the section of the peripheral wall adjacent to the gas inlet during discharge of the gas in low pressure from injector. The air inlet can be provided only at the peripheral wall such that being primary air inlet of the burner assembly, also at the alternative embodiments is used to provide another air inlet in addition to auxiliary or primary air inlet opened at the top and/or base.

In a preferred embodiment of the invention, the air inlet comprises an opening in the form of a through-hole at the peripheral wall. The air inlet is simply formed during production of the burner assembly since the air inlet is formed when the base is cut or stamped in mold from the peripheral wall. Also, opening at the peripheral wall allow bring the air surrounding the base with least loss of pressure. In a preferred embodiment of the invention, an inlet nozzle is confining the opening by extending outwardly from the opening. The inlet nozzle protects the opening from external factors, such as spilled foods or external contaminants such as dust. The inlet nozzle could be in an angled or circular cross-sectional form adapted to the outer form of inlet opening. Also, the inlet nozzle could be in a form covering inlet opening from upper side such as a bonnet or entirely cover in tube like form.

In a preferred embodiment of the invention, the inlet nozzle is expanding outwardly from the opening. In this way, the ambient air moving towards the base is accelerated by the narrowing cross-section. It has been determined that the accelerating ambient air provides a well-mixed an air gas mixture at the mixing chamber which entails reaching to a surprisingly lower emission value.

In a preferred embodiment of the invention, a nozzle inlet of the venturi element aligns towards the gas inlet. In this situation, the combustion gas which is provided by the gas inlet is fed to the venturi without disturbing the flow dynamics. In preferred embodiment, there is no obstacle to affect the flow dynamics between the gas inlet and inlet nozzle of the venturi element.

In a preferred embodiment of the invention, the gas inlet and the inlet nozzle extend substantially co-axial. By this means, while low pressure burner gas supplied from gas inlet, e.g. LPG or natural gas, by blown from inlet nozzle into the venturi element, the air disposed at the mixing chamber is mixed effectively and moves on fast at the venturi element. In such a way, the air surrounding the combustion gas accelerate together with its surrounding air and high burner performance is obtained using a short venturi element at the base.

In a preferred embodiment of the invention, part of the mixing chamber confined by peripheral wall comprises a concave arc form aiming to the center of the venturi element. Arc form enables the axis of gas inlet and the peripheral wall is aligned to the axis of the venturi element. Thus, a compact base design is possible by redirection of the gas inlet and the air inlet to the venturi element is provided by the peripheral wall itself.

In a preferred embodiment of the invention, the air inlet is provided such that the gas inlet is disposed at the center of the arc form substantially symmetrical position at the corresponding ends of the peripheral wall. Thus, disposing more than one air inlet at the preferably, right and left hand side of the peripheral wall with injector prevented the bending of the gas jet fed by the injector by air disturbances occur due to the various reasons. Surrounding air flows are converted to laminar flow with this air corridors prevent deformation of laminar air of the injector by reaching it.

A preferred embodiment of the invention comprises a flow regulator which is disposed to the air inlet is balancing the pressure in covering manner and allowing the air flow. Flow regulator, regulate instant low and high pressures which occurs, e.g. during opening the oven door via several perforated meshes which is disposed to end of the nozzle confining the air opening, preventing disturbance of laminarity of the injector jet.

A preferred embodiment of the invention comprises a top cover closing the upper part of the base and providing fluid communication to the flame distributor providing air gas mixture via an outer ring and an inner ring with the corresponding distribution channels in a hermetically sealed manner. The top cover provides to move on the air gas mixture only from upper of the distribution channels by closing inner chamber which parts such as mixing chamber of the base and venturi element is disposed

A preferred embodiment of the invention comprises a cut-out part is formed at the peripheral wall of the top cover at a vicinity of the gas inlet. The cut-out part enables the burner assembly to receive additional air from upper side of by providing an additional air inlet.

In a preferred embodiment of the invention, the width of cut-out part is arranged narrower than the part at which the air inlet of the peripheral wall is disposed. Thus, the air supplied to base from the upper cover from upper of the cut-out part is prevent negative influence on the flow dynamics of the primary air inlet which is supplied from air opening.

In a preferred embodiment of the invention comprises an assembly distance is provided between base and flame distributor. Assembly distance enables flame distributor to be removed from upper of the base by gripping from below.

An embodiment of the invention in order to achieve above objection is a cooking appliance having a burner assembly as mentioned above.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is the isometric view of a representative embodiment of the burner assembly in mounted position including upper covers. Figure 2, base with cover perspective view of the burner assembly as seen in Figure 1 wherein the flame distributor is removed.

Figure 3 is side view of a representative embodiment of the burner assembly of the invention.

Figure 4 is A-A cross-sectional view of the burner assembly according to the Figure 3.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter has been descripted with reference for examples, such that there is no restriction and only to better understanding.

A representative embodiment of the burner assembly of the invention is shown alone, such that not assembled to a cooking appliance in Figure 1 . The burner assembly comprises a circular base (10); an upper cover (20) covering the base (10) providing gas sealing and a flame distributor (30) adapted to top of the upper cover (20) providing gas transmission and an upper cover (40) covering the flame distributor (30) from top. The base (10), the upper cover (20), the flame distributor (30) and the upper cover (40) is aligned co-axially and in circular form. The base (10) is extending radial outwardly with a flange (1 1 ) form at the rear part and is in a tray-like circular form. The peripheral wall (12) confining a mixing chamber (16) comprising a container form extending downwards is disposed at the front part of the base (10) provided an injector (70). Peripheral wall (12) is in a circle arc form aligned with the flame distributor (30). The base (10) has a neck part (13) providing a recess in a Y-like form on top edge downwardly, on top of the peripheral wall (12). A gas inlet (14) is mounted in a cylindrical form having a small angled inner gap is provided at the distal end of neck part (13). The injector (70) is mounted inside the gas inlet (14) for sealing gas. The injector (70) is mounted from free end to a gas distribution pipe (60). An air inlet (18) and an auxiliary air inlet (19) is disposed respectively at two sides of the gas inlet (14) top of the peripheral wall (12). The air inlet (18) and the auxiliary air inlet (19) is in perpendicular axis, symmetrical position and similar constructional form according to the injector (70). The air inlet (18) has an orifice starting wide and narrowing according to the gas inlet (14). The air inlet (18) is in a form suchlike rectangle. The air inlet (18) and the auxiliary air inlet (19) communicates with mixing chamber (16) from front part. An upper cover (20) Mounting element (22) is immobilized such that can be removed, for example, by means of screw, above radial inward planary assembly surface at upper part of the base (10). The flame distributor (30) which is disposed co-axially above upper cover (20) comprises an outer ring (34) and an inner ring (36) distant this. Multiple cut outs (32) are formed in a such that distant radially each other above both the outer ring (34) and the inner ring (36). Cut outs (32) composes parts of burner assembly air gas mixture discharges in order to be composed circlet figure flame. A flat circular inner cover (44) is disposed distantly and co-axially with an outer cover (42) in the form of a cut-out conical plate respectively on the outer ring (34) and the inner ring (36), in order to form a bearing which discharges the air gas mixture of the slits (32). Functional elements (50), e.g. a flame sensor and lighter, is disposed in a near to inner ring (36) between inner ring (36) and outer ring (34) in perpendicular position.

Burner assembly is shown in perspective in position which flame distributor (30) removed by taken from its place in figure 2. The upper cover (20) mounted such that sealed above the base (10) is in a design circular plate. The upper cover (20) is mounted to base (10) by reclining to recesses extending along radial in from upper part (15) of the base (10), with mounting elements (22) provided above recesses. Reaching mixing chamber (16) from up is enabled by a cut out part (26) which is extended partly towards its central composed at the part of the upper cover (20) which close to gas inlet (14). Cut out part (26) is wide enough to take inside the gas inlet (14) and to intersected partly with air inlet (18) at its two sides. A planary support plate (27) which detaching venturi element (17) and mixing chamber (16) each other is extending downwards from inner side of the cut-out part (26). The support plane (27) has a recess with bottom end in the form semicircle. Therefore, the support plane (27) forms an upper part of the nozzle inlet (172) of the venturi element (17) from upper part of the bottom end.

An inner distribution channel (25) is formed in a circular hole design at central of the upper cover (20). The inner distribution channel (25) has a grooves which is standing as an assembly distance (h) as towards above of the upper cover (20) from circular hole sides. A distribution channel (23) in form symmetrical curvilinear hole and an opposite auxiliary distribution channel (24) is provided according to extending direction of the gas inlet (14) at the corresponding two sides of the inner distribution channel (25). Functional element (50) stands between the inner distribution channel (25) and the distribution channel (23) in a close manner to the inner distribution channel (25). As shown in figure 2, the air inlet (18) comprises an air inlet nozzle (183) which has a profile form expanding outwards. The air inlet nozzle (183) moves on till an opening (182) which composes a hole communicates with a mixing chamber (16) above the peripheral wall (12) by narrowing from a front part (181 ) extending downwards from side of the upper part (15). The burner assembly is shown from the sidewise in figure 3. The injector (70) is mounted to the gas inlet (14) such that small angled (for example 8°) according to horizontal axis. The air inlet (18) extends along in a angled manner according to the injector (70) and according to co center of the base (10) and the flame distributor (30) of the burner assembly. The venturi element (17) extends along till opposite end of the base (10) by starting from middle part. A clearance as much as assembly distance (h) remains between the flame distributor (30) which is residing to a bottom hole (not shown) corresponding above the distribution channel (23) and the upper cover (20).

Burner assembly in figure 4 is shown in A-A section. As seen in here, an injector (70) head part (72) is mounted inside the gas inlet (14) such that extending to the mixing chamber (16). The injector (70) blows LPG or natural gas such that providing laminar flow in extending direction from head part (72). Therefore, it composes a gas dense field (166) in the mixing chamber (16). The adjacent part of the gas dense field (166) in the mixing chamber (16) is the air dense field (164) near to the air inlet (18). The peripheral wall (12) forms suchlike arc form in the base (10). The injector (70) vertically cuts the arc from the middle extends along in the middle of the peripheral wall (12). The injector (70) extending direction is aligned to the venturi element (17) nozzle inlet (172) from its central. On the other hand, the air inlet (18) and the auxiliary air inlet (19) is positioned towards the nozzle inlet (172) at ends of the peripheral wall (12) A multiple hole flow regulator (184) is immobilized at front of the opening (182) at the air inlet (18). Sides across each other and opposite sides which is towards each other of the air inlet nozzle (183) are inclined oppositely. By this means, an air inlet nozzle (183) narrowing to the opening (182) is procured. The outlet opening (162) is located above wall of the mixing chamber (16) opposite the peripheral wall (12). Outlet opening (162) communicates with directly nozzle inlet (172). The venturi element (17) is in a channel form which is stretched at continuation of the nozzle inlet (172). A narrow protrusion (174) communicating with the nozzle inlet (172) communicates with expanding protrusion (176) in a conic manner as from an expansion part locating in middle of the channel.

When low pressure combustion gas is supplied from the injector (70) to the mixing chamber (16), the combustion gas moves on towards the nozzle inlet (172) and draws ambient air into the mixing chamber (16) with low pressure from the air inlet (18) at the peripheral wall (12) on the base (10). The air gas mixture supplied from the mixing chamber (16) is transferred from the venturi element (17) to the distribution channels (23, 24, 25) and delivered to the flame distributor from here (30). REFERENCE NUMBERS

10 Base 20 Upper cover

1 1 Flange 21 Rear extension

12 Peripheral wall 22 Mounting element

13 Neck part 23 Distribution channel

14 Gas inlet 24 Auxiliary distribution channel

15 Upper part 25 Inner distribution channel

16 Mixing chamber 26 Cut-out part

162 Outlet opening 27 Support plate

164 Air dense field 30 Flame distributor

166 Gas dense field 32 Slit

17 Venturi element 34 Outer ring

172 Nozzle inlet 36 Inner ring

174 Narrow extension 40 Upper cover

176 Expanding lug 42 Outer cover

18 Air inlet 44 Inner cover

181 Front part 50 Functional unit

182 Opening 60 Gas distribution pipe

183 Air inlet part 70 Injector

184 Flow Regulator 72 Head part

19 Auxiliary air inlet

h Assembly length

Claims

1 - A burner assembly for a cooking device comprising a peripheral wall (12) having a gas inlet (14) to supply combustion gas by an injector disposed in a horizontal or narrow angle position and a base (10) at least partly confined by the peripheral wall (12) and a venturi element (17) adjacent to a mixing chamber (16) accessed by the gas inlet (14) extending along the base (10); a flame distributor (30) transferring gas air mixture provided from the base (10) by means of a corresponding distribution channel (23) by supplying from mixing chamber (16) and circumferentially discharges air gas mixture from multiple slits (32) characterized in that at least one air inlet (18) provided directly at the peripheral wall (12) and supply ambient air from the base (10) such that composing air-gas mixture with combustion gas by accessing to the mixing chamber (16).

2- A burner assembly according to claim 1 , wherein the air inlet (18) is provided adjacent to gas inlet (14) at the peripheral wall (12).

3- A burner assembly according to any of the preceding claims, wherein the air inlet (18) comprises an opening (182) in the form of a through-hole at the peripheral wall (12).

4- A burner assembly according to claim 3, wherein an inlet nozzle (183) is confining the opening (182) by extending outwardly from the opening (182).

5- A burner assembly according to claim 4, wherein the inlet nozzle (183) is expanding outwardly from opening (182).

6- A burner assembly according to any of the preceding claims, wherein the nozzle inlet (172) of the venturi element (17) is aligned towards the gas inlet (14).

7- A burner assembly according to claim 6, wherein the gas inlet (14) and the nozzle inlet (172) are extending substantially co-axial.

8- A burner assembly according to any of the preceding claims, wherein the part of the mixing chamber (16) confined by peripheral wall (12) is in a concave arc form aim to the center of the venturi element (17). 9- A burner assembly according to claim 8, wherein the air inlets (18) are in substantially symmetrical position at the corresponding ends of the peripheral wall (12) such that the gas inlet (14) is disposed at the center of the arc form.

10- A burner assembly according to any of the preceding claims, wherein a flow regulator (184) disposed to the air inlet (18) is balancing the pressure in a covering manner and allowing the air flow.

1 1 - A burner assembly according to any of the preceding claims, wherein a top cover (20) closing the upper part of the base (10) and in fluid communication to the flame distributor (30) providing air gas mixture via an outer ring (34) and an inner ring (36) with the corresponding distribution channels (23, 24, 25) in a hermetically sealed manner.

12- A burner assembly according to claim 1 1 , wherein a cut-out part (26) is formed at the peripheral wall (12) of the top cover (20) at a vicinity of the gas inlet (14).

13- A burner assembly according to claim 12, wherein the width of cut-out part (26) is arranged narrower than the part at which the air inlet (18) of the peripheral wall (12) is disposed.

14- A burner assembly according to any one of the preceding claims, wherein an assembly distance (h) is provided between base (10) and flame distributor (30).

15- A cooking appliance having a burner assembly according to anyone of the preceding claims.