EP0789190A2 - Gas burner for cooking ranges - Google Patents

Abstract

The gas burner has a burner head which is mounted on a mixing pipe. A cover is held at a distance from the head, and a profiled disc (2) is arranged underneath it in order to create vortices in the gas stream. The disc has an inner circular opening, and has vane-like elements (7) in order to guide the flames. The elements are arranged on the surface of the disc, and extend across the plane of the latter. The edge of the disc which forms the elements may have radial incisions, and the sections between the incisions may have edges (8) which are each bent in order to form an acute angle to the plane of the disc.

Description

The invention relates to a gas burner according to the preamble of claim 1 and a mixing tube and a swirl disk, in particular for such a burner.

In known gas burners of this type, a corrugated disc has a central fastening opening and a plurality of through openings arranged on an inner ring line for the gas mixture supplied from below and an outer edge region provided with corrugations or profilings in order to form radially directed outlet openings for the gas. Under the corrugated disc there is a perforated disc or sieve to prevent the flame from kicking back into the mixing tube, and above the corrugated disc there is a cover disc that covers the upper edges of the corrugations or profiles to form radial flow channels, as well as a cover , the edge of which is slightly drawn down and protrudes above the corrugated disc. This entire arrangement, consisting of several individual parts, is attached to the burner head by means of a central screw. The corrugated disc creates radially outward flames, one of the burner size and form the set gas pressure dependent radial flame ring.

Such a burner must meet various requirements, some of which contradict each other. The burner must enable so-called over-ignition, i.e. that when igniting a single flame emerging from an edge opening must be able to ignite the gas jet emerging from the adjacent opening so that the burner is ignited all around in a short time and no unburned gas escapes. Ignition is only possible, however, if the gas jet does not emerge too strongly and is somewhat swirled at the edge of the lid. On the other hand, this leads to an undesired disturbance of the flame, once it has been ignited, by deflecting it in the direction of the hob and thereby heating the hob.

The burner must also be secure against kickback; i.e. Even if the flame is set to a low level, it must not strike back into the mixing tube or continue to burn in the burner head, because otherwise the burner could be destroyed in a short time. The sieve or perforated plate already mentioned serves to prevent kickback.

For safety reasons, it is necessary and stipulated in relevant regulations that the resulting combustion gases are as free as possible of unburned gas and carbon monoxide. This is done primarily by a precisely measured admixture of air in the mixing tube as a function of the controller position and by guiding the gas in the burner.

For reasons of user friendliness, a burner should also make as little noise as possible. For this purpose, an additional plate is provided above the sieve plate, through which the noise is largely eliminated.

Finally, a gas burner should also have the best possible efficiency, which in the present case means the ratio of the amount of energy supplied with the gas to the amount of energy absorbed by the vessel to be heated. A certain minimum efficiency is specified in the relevant approval regulations. In the European standard EN 30, the minimum efficiency is 52% based on the calorific value Ho.

The invention has for its object to provide a gas burner that allows a safe ignition with a simple structural design, prevents the flame from flashing back, burns with little noise and has an improved efficiency with improved hygienic behavior (CO content).

The object is achieved with the features of claim 1. The swirl disk is advantageously designed as an annular disk with an inner circular opening. The inner and / or outer edge of the annular disc is provided with radially aligned incisions at regular intervals. The sections formed between the cuts are bent with their inner edges such that the edges form an acute angle with respect to the plane of the disk and one end of each edge can lie above and the other end below the plane of the disk.

The swirl plate designed in this way causes the gas to swirl as it emerges from the gap between the burner head and the cover and is deflected somewhat in the circumferential direction. In contrast to known gas burners, which form a ring of radially outwardly directed, powerful flame jets, the burner according to the invention produces a calm flame ring which tends upwards and inwards over the edge of the cover. With a vessel attached, the flame is distributed evenly over almost the entire floor area.

Since there are no pronounced individual jets and the gas or flame flows slightly inward over the cover, a reliable over-ignition takes place when lighting, i.e. the flame ignites immediately over the entire circumference of the burner. Furthermore, the swirl plate reliably prevents the flame from kicking back over the entire control range of the burner. The burner works almost silently and has a greatly improved efficiency compared to other burners, which is primarily due to the fact that the heat transfer takes place over almost the entire bottom surface of the cooking vessel, whereas in the known gas burners mentioned above, a relatively large area in the middle the burner lid remains unheated and / or the flames spread over the bottom of the cooking vessel.

The advantages set out above are achieved with a gas burner which has only two parts placed on the burner head, namely the swirl disk and the cover. The lid can be smooth on its edge, since its edge is not used to swirl the gas, but the swirling takes place before the mixture exits within the burner head. Known burners, on the other hand, require four parts, namely an additional sieve or perforated disk to prevent kickback and a cover disk for the swirl disk, which also serves to avoid noise.

The efficiency of the burner according to the invention could be increased to 59% or 68% based on the calorific value Hu, as practical tests have shown. Due to the improved fuel gas outlet conditions at the burner head and the better flame line, the heat radiation from the burner to the hob and the components below it is reduced, so that smaller dimensions can be maintained or separate insulations are omitted and any other devices underneath are less impaired in their function .

The other claims have advantageous refinements.

For example, the swirl disk can be placed loosely on the upper edge of the burner head and held in place by retraction. Alternatively, the swirl disk can also be fixed at the upper edge of the burner head by means of a snap-in connection. This type of definition is recommended for the gas burners of portable cooking devices or in camping vehicles, in which a loosely placed vortex disc could be displaced by vibrations.

The cover lies directly on the upstanding corners of the swirl disk and can be secured by a fastening if necessary.

If the cooking appliance (s) receiving the gas burner has a hob, the mixing tube can be guided from below through the hob of the cooking appliance with an angled end piece and supported with a flange under the hob such that the burner head, which is provided with an internal thread, is screwed onto the tube can be that the hob is pinched by both parts. The mixing tube is slightly upwards opposite the hob. This prevents e.g. Overcooked liquids get into the mixing tube. Furthermore, the clamp connection between the burner head, the hob and the flange of the mixing tube under the hob is designed so that a sealing connection is made and no boiling liquid can get into the space below the hob.

A special sealing of the hob is therefore no longer necessary.

Fig. 1

einen senkrechten Schnitt durch einen Gasbrenner gemäß der Erfindung,

Fig. 2

eine gegenüber der Fig. 1 abgewandelte Ausführungsform,

Fig. 3

eine perspektivische Darstellung der Wirbelscheibe,

Fig. 4

eine Draufsicht auf den Gemischdurchlaß der Wirbelscheibe, und

Fig. 5

einen Schnitt durch die Wirbelscheibe.

Further features, advantages and details of the invention result from the following description with reference to the drawing. Show it:

Fig. 1

a vertical section through a gas burner according to the invention,

Fig. 2

1 modified embodiment compared to FIG. 1,

Fig. 3

a perspective view of the vertebral disc,

Fig. 4

a plan view of the mixture passage of the swirl plate, and

Fig. 5

a section through the vertebral disc.

The gas burner consists of a pot-shaped burner head 1, on the upper edge of which a swirl disk 2 and a cover 3 rest. The burner head sits on the upwardly bent end of a mixing tube 4, which comes from an injector, not shown.

The vortex disk 2 has the shape shown in FIGS. 3 to 5. The base body is an annular disc with a diameter that corresponds approximately to the diameter of the burner head 1. The outer edge region 5 of the disc is flat. The inner edge region has a plurality of radially running incisions 6 which extend approximately over half the ring width. Roughly rectangular sections 7 are formed in plan from the incisions 6, the inner edges 8 of which form the inner edge of the annular disk. In addition to the inner sections, the sections could also be arranged on the outer circumference of the swirl disk or only on the outer circumference.

The inner edges 8 are bent in the manner shown in FIGS. 3 and 5 with respect to the plane of the disc, so that they form an acute angle with respect to this and protrude like small blades on both sides beyond the plane of the disc. All bent edges 8 are parallel to each other. The sections 7 thus form deflection surfaces which swirl the gas passing through and give it a certain swirl.

The lid 3 lies directly on the upwardly facing corners of the sections 8, so that the gas can only escape through the slots formed by the sections. At its outer edge, the cover 3 has a downward indentation which projects somewhat radially over the edge of the burner head 1. This prevents liquid that could possibly get onto the cover 3 from entering the interior of the burner head.

1, the swirl disk 2 is loosely placed on the upper edge of the burner head 1, which has a recess 9 there to center the swirl disk. This design is sufficient for permanently installed cooking devices and enables easy disassembly for cleaning and maintenance.

Fig. 2 shows an alternative arrangement in which the swirl disk 2 is fixed to the burner head with a snap connection. This type of attachment is recommended for portable cooking devices, such as in camping vehicles, in which vibrations could cause the swirl disk and, if necessary, the cover. In addition, the cover 3 and the swirl disk 2 can be connected to one another by a centrally arranged, axially extending fastening such as a screw, rivets and / or the like.

In Fig. 1, the spread of the flame is indicated at 10. The flame arises at the outlet gap of the gas between the edge of the burner head 1 and the cover 3 and spreads in a ring around the cover. It is pulled slightly inwards over the cover 3. When ignited, the gas ignites immediately over the entire circumference of the burner.

The flame has no pronounced beam direction and burns quietly without noise. It is distributed evenly over the bottom surface of a patch Vessel and thus causes heat transfer on almost the entire surface. This effect is based in particular on an improvement in the efficiency of approximately 52% based on the calorific value Ho in known gas burners to more than 56% and 68% based on the calorific value Hu in the present invention.

The exhaust gas is perfect in terms of so-called combustion hygiene, i.e. it contains no toxic components and complies with the approval regulations applicable to gas burners. A flashback of the flame into the mixing tube or an internal fire in the burner head does not occur under all operating conditions.

The burner head 1 can be fixed to the mixing tube 4 by means of a threaded sleeve 11. In the embodiment shown in Fig. 1, the mixing tube 4 also has a flange 12 which bears against the hob 13 of the cooking device from below. In this way, a sealing connection is created, which prevents over-boiling liquid from reaching equipment installed underneath the hob. This eliminates the need for an additional seal.

In another embodiment, not shown in detail, the burner head 1 can also be fixed to the mixing tube by means of an easily detachable connection, for example a bayonet lock.

In the embodiment according to FIG. 2, the end of the mixing tube 4 protrudes a little beyond the hob 13 with a protrusion, so that the penetration of cookware into the mixing tube 4 is prevented and an additional seal is unnecessary.

Reference list

1

Burner head

2nd

Vertebral disc

3rd

cover

4th

Mixing tube

5

outer edge area

6

Incisions

7

Sections

8th

inner edges

9

Confiscation

10th

flame

11

Threaded sleeve

12th

flange

13

Hob

Claims (16)

Gas burner for cooking appliances, iw comprising a mounted on a mixing tube (4) the burner head (1), a cover held at a distance of the burner head (1) (3) and, disposed under the lid, the gas stream swirling profiled Wirbeischeibe (2), characterized characterized in that the vortex disc (2) is designed as a disc with an inner circular opening and that blade-shaped flame-guiding elements (7) which extend transversely to the disc plane are arranged on the disc surface. Gas burner according to claim 1, characterized in that the edge of the swirl plate to form the flame guide elements (7) is provided with radially oriented incisions (6) and that the portions (7) formed between the incisions (6) with their edges (8) are bent such that the edges form an acute angle with respect to the plane of the disk. Gas burner according to claim 2, characterized in that and one end of each edge (8) lies above and the other end of each edge (8) lies below the plane of the disc (2). Gas burner according to one of the preceding claims, characterized in that the flame guide elements (7) are arranged on the outer and / or inner edge of the swirl plate (2). Gas burner according to one of the preceding claims, characterized in that the swirl disk (2) is loosely inserted into a recess (9) at the upper edge of the burner head (1). Gas burner according to one of the preceding claims 1 to 4, characterized in that the swirl plate (2) is fixed with a latching connection at the upper edge of the burner head (1). Gas burner according to one of the preceding claims, characterized in that the burner head (1), the swirl plate (2) and the cover (3) are connected to one another by a fastening device, in particular an axially arranged screw, rivets, weld seams and / or the like. Gas burner according to one of the preceding claims, characterized in that the burner head (1) is screwed onto a mixing tube with the interposition of a threaded sleeve (11). Gas burner according to one of the preceding claims 1 to 7, characterized in that the burner head (1) is connected to a mixing tube by a bayonet lock. Gas burner according to claim 8 or 9, characterized in that the angled mixing tube (4) is guided from below through the hob (13) and is supported on the hob (13). Gas burner according to one of claims 8 to 10, characterized in that the angled mixing tube (4) or a mixing chamber under the hob (13) is supported with a flange (12) such that the hob (13) between the burner head (1) and the flange (12) is tightly clamped. Mixing tube for gas burners, which are arranged above a hob, in particular according to one of the preceding claims, characterized in that the mixing tube (4) at its bottom into the Cooking hob (13) inserted angled end piece has a projection over the hob (13). Vortex disk for gas burners for generating a swirled gas flow, characterized in that the vortex disk (2) is designed as a disk with an inner opening and that vane-shaped flame-guiding elements (7) are arranged on the disk surface which extend transversely to the disk plane. Vortex disc according to Claim 13, characterized in that the edge of the vortex disc is provided with radially oriented incisions (6) to form the flame-guiding elements (7) and in that the portions (7) formed between the incisions (6) with their edges (8) are of such a type are bent that the edges form an acute angle with respect to the plane of the disc. Vortex disc according to claim 13 or 14, characterized in that the flame guide elements (7) are arranged on the outer and / or inner edge of the vortex disc (2). Vertebral disc according to one of the preceding claims 13 to 15, characterized in that the opening is circular, the incisions (6) are arranged at regular intervals, one end of each edge (8) above and the other end of each edge (8) below the Level of the disc (2) lies and all sections (7) are bent in the same direction and at the same angle.

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