TECHNICAL FIELD

The invention relates to a multi-gas burner assembly for use in domestic cooking gas ovens and hobs, comprising gas ducts for the advancement of the air-gas mixture, inner, middle, and outer ring ports, a flame crown, a curved or flat inner and outer valve, and an air-gas mixture tank in which combustion takes place.

PRIOR ART

Today, the working principles of multi-gas burners used in domestic cooking gas ovens and stoves are as follows; the gas coming from the main gas distribution pipe first comes to the tank, where the gas starts to mix with air. Then, the air-gas mixture comes into the injector and the incoming gas is sprayed through the injector into the vertical venturi. The air-gas mixture travels through the vertical venturi, hits the inside of the valve, and then travels to the ports in the burner body. Combustion is also realized with the ignition spark plug mounted on the tank. In the state of art, the ports on the flame crown are produced in a straight and curved shape without any angles. When ignited with a spark plug, the burning flame emerges horizontally in parallel from the full combustion ports with the valve positioned above it and then rises upwards. The tip of the flame gives off the most heat. Therefore, a more efficient multi-gas burner is obtained if the tip of the flame is not angled, but directly upwards.

The ports in the multigas burner are designed at an angle so that the flame is directly upwards from the full combustion ports. This ensures very good combustion of the air-gas mixture, significantly increasing efficiency.

In current multi-gas burners, the gas coming from the gas distribution pipe is first filled into the tank, where air-gas mixing is achieved. The air-gas mixture mixed in the tank is sprayed by the injector into the vertical venturi. The air-gas mixture travels through the vertical venturi, hits the existing flat-shaped inner valve on the inside, and starts to diffuse. The air-gas mixture diffused into the inner and outer ring ports is ignited and burned by the spark plug. In flat valves, when the air-gas mixture coming from the vertical venturi hits the valves, some of it returns due to the impact, creating turbulence, and gas asphyxiation occurs. Therefore, a significant part of the air-gas mixture cannot burn and gas efficiency is low. The air-gas mixture that reaches the full combustion ports burns thanks to the spark plug that provides ignition. The air-gas mixture that reaches the ports through the ducts in the body shows more combustion in the ports closest to the ducts, while the ports that are farther away from the ducts show less combustion. In this case, the combustion in the current multi-gas burner is not homogeneous and the heat is not evenly distributed to the cookware placed on it. In addition, the ports in some existing multi-gas burners are manufactured in a flat shape without angles. When ignited with a spark plug, the burning flame emerges horizontally, parallel to the height of the ports on which the valve is positioned, and then rises upwards. Since the tip of the flame is where the flame gives off the most heat, the angular flame rising up through the ports causes losses and reduces efficiency. The steeper the flame upwards from the gas burner, the higher the efficiency. However, if the flame crown is too steeply angled, the multi-gas burner will take up too much space and unnecessary material will be wasted.

Patent file titled "HIGH-EFFICIENCY MULTI-GAS BURNER USED IN HOME COOKING GAS OVEN AND COOKERS" with application number TR 2017/21088; is related to a high-efficiency aluminum multi-gas burner used in domestic cooking gas ovens and stoves, with gas channels that allow the air-gas mixture to progress, an internal separator with a spark plug and thermocouple housing, an angularly designed flame crown with inner, middle and outer ring ports, a curved designed inner and outer valve and a tank where the air-gas mixture is provided, where combustion takes place. Due to the structure of the area of the gas outlet injector outlet of the multi-gas burner mentioned in this application, it causes an uneven gas flow. In the event of a possible overflow in the air supply duct area, there is no solution to prevent the liquid from entering the tank of the multi-gas burner. Since a homogeneous pressure distribution cannot be achieved, the efficiency of the burner is significantly reduced.

Patent application EP96109934A relates to a burner for gas cookers comprising a central flame crown, two concentric peripheral crowns, a horizontal Veturi effect chamber, and holes or slots for providing the feed. It aims to reduce the effects of turbulence during the gas flow, but there are power losses in the delivery of the gas mixture to the inner ports and the efficiency of gas combustion at the inner port is reduced.

The application number EP3971479A1 refers to a multi-gas burner combustor for kitchen applications. The invention relates essentially to a one-piece burner unit, in particular to a form of connection in the upper part of the burner. The type of connection mentioned is the connection of parts in the file in such a way that they can move relatively in the vertical direction. It provides convenience for the user for operations such as cleaning on the countertop; assembly, disassembly, and positioning. The relative movement mentioned here creates sealing problems, and at the same time, while it provides ease of cleaning, it also causes foreign matter, liquid, and dirt to enter the system, especially in the event of a possible overflow. PURPOSE OF INVENTION

Today, domestic cooking gas ovens and stoves use a variety of multi-gas burners that ensure combustion and uniform heating of the bottom of the cookware placed on it. In order to increase the efficiency of the gas burners used, gas emissions should be minimized. However, gas losses occur due to the structure and design of the existing multi-gas burners. The multi-gas burner of the invention is designed to ensure efficient combustion of the air-gas mixture by significantly minimizing gas emissions.

The object of the invention relates to a multi-gas burner for regulating the gas flow by shortening and simplifying the gas path to the ports, thereby making the inner ring combustion feed stable and with higher heat transfer efficiency.

A further object of the invention relates to a multi-gas burner having an injector with a special internal structure that ensures homogeneous pressure distribution.

A further object of the invention is that it has holes parallel to the surface of the curve, which reduces the effect of gravity and makes the gas flow more stable.

A further object of the invention is to provide an injector outlet section that increases efficiency by ensuring that the gas flow form is regular with minimal deviation.

Another purpose of the invention is that it provides ease of installation for the user and prevents gas leaks in the center and does not disturb the flow dynamics, as well as having a connection form that supports the unitary form of the gas structure.

Another purpose of the invention is that it has a set structure that prevents the liquid from entering the tank in case of a possible overflow, preventing negative effects on the system, such as possible dirt or clogging of the tank with liquid.

A further object of the invention is to eliminate sealing problems in these areas thanks to the shape of the spark plug and thermocouple housings.

Figure 1 , Exploded view of the inventive multi-gas burner,

Figure 2, Top perspective detail views of the flame crown,

Figure 3, Bottom view and detail of the flame crown

Figure 4, Top perspective view and detail of internal separator element

Figure 5, Perspective view and detail of the tank section Figure 6, Sectional view of tank section and detailed view of injector section

Figure 7, Injector sectional view

REFERENCE NUMBERS

1. Tank body

1 .1 barrier

1 .2 hob connection slots

1 .3 injector gas outlet

2 Internal separator

2.1 connection slot

2.2 radius protrusion

3 Flame crown

3.1 Channels

3.2 Center hole

3.3 connection pin

3.4 radius recess

4 Outer cap

5 Inner cap

DETAILED DESCRIPTION OF THE INVENTION

Figure 1 shows an exploded view of the inventive multi-gas burner. The multi-gas burner according to the invention comprises a tank body (1 ) comprising an injector assembly and a mixing chamber-shaped tank (1.4) in which the air-gas mixture is supplied and transmitted to the next element, an internal separator (2), and a flame crown (3), which are removably mounted to each other and form paths for distributing the air-gas mixture to the ports (4,5).

Figure 5 and Figure 6 show the structure of the tank body (1 ) in detail. The tank body (1 ) comprises a tank (1 .4) in the form of a chamber with an air-gas mixture, an injector housing, an injector, an injector gas outlet (1 .3), at least one hob connection slot (1 .2), and an air supply duct area (1.5) for securely mounting the tank body (1 ) on the hearth. The injector gas outlet (1 .3) has a radius structure, which increases the efficiency by regularizing the gas flow form.

In the tank body (1 ), there are air supply duct zones (1.5) through which air is drawn into the tank (1.4) for air-gas mixing. This region has a barrier (1.1 ) in the form of a protrusion extending along its perimeter. This prevents liquid and/or dirt from filling the tank (1 .4) in the event of an overflow during cooking. Figure 1 and figure 4 show the structure of the internal separator (2). The internal separator

(2) is an intermediate element between the tank body (1 ) and the flame crown (3) and has connection slots (2.1 ) on it, which allow the flame crown (3) to be detachably mounted. When mounted with the flame crown (3), the air diffusion channels (2.3) on the flame crown (3) and the bridges (3.5) on the flame crown (3) overlap to provide a path for the transmission of the air-gas mixture. The dome-shaped curved form of the upper part of the discharge channel on the surface of the internal separator (2) facing the flame crown (3) is related to the domeshaped curved form of the internal combustion port. These two structures mate with the assembly to form a cavity in the form of a path through which the air-gas mixture passes. Making the discharge channel curved rather than straight ensures that the volume of the path through which the mixture passes remains constant and the flow of the gas is not affected. These two parts are detachably mounted to each other by inserting the corresponding connection pins (3.3) in the flame crown (3) into the connection slots (2.1 ) on the internal separator (2). Although the connection pins (3.3) and connection slots (2.1 ) on the internal separator (2) and flame crown (3) provide a unitary connection, they cause gas leaks from the radius around the inner ring. The radius recess (3.4) in this section and the corresponding radius protrusion (2.2), prevents gas leakage due to the circular form of this area, while at the same time eliminating the incorrect assembly of the internal separator (2) and the flame crown

(3).

Figure 1 , figure 2 and figure 3 show the flame crown (3) structure in detail. The flame crown (3) has on its lower surface the connection pins (3.3) that match the connection slots (2.1 ) on the internal separator (2). In this way, the multi-burner overcomes the connection problems brought about by the screw connection, problems in assembly, problems such as loosening of the connection caused by the wear of the screws over time and disrupting the dynamics of the gas-air mixture; and it provides a detachable and ergonomic connection. In the state of art, the multi-gas burner had 8 cross holes for the centre feed and these holes were not included in the curve of the upper section. In this way, the gas-air supply for the inner ring combustion was uneven due to turbulence in the area as the flows from the holes collided with each other in the middle. The multi-gas burner according to the invention has 4 cross channels (3.1 ) with a minimum diameter of 04mm and a maximum diameter of 08mm and a center hole (3.2) with a minimum diameter of 00.5mm and a maximum diameter of 03mm in the center of the crown. The optimum working diameter of the cross channels (3.1) is 06mm. The aforementioned cross channels (3.1 ) extend through the curved structure and have radius at the points where it explodes, i.e. where the gas-air mixture exits. With the mentioned radius, the parallelism of the cross channels (3.1 ) to the ground has been increased to eliminate the negative effect of gravity slowing down the flow of gas. The center hole (3.2) delivers the air-gas mixture from the injector () vertically to the area where it is fed for direct inner ring combustion. In this way, the gas-air mixture coming from the cross channels (3.1 ) is prevented from colliding with each other in the middle and creating turbulence, and the gas airflow coming from the center hole (3.2) directs the air-gas mixture coming from the cross channels (3.1 ) to the upper cap and ensures that the gas airflow is transmitted to the ports in an orderly manner from the surface of the upper cap. This shortens the path of the gas-air mixture to the port and makes the flow more regular.

Figure 7 shows a cross-sectional view of the injector. The multi-gas burner according to the invention has an injector with a special internal structure that ensures homogeneous pressure distribution. The structure of the inventive injector is shown in Figure 6. The injector structure is cylindrical and countersunk, which allows the gas flow to be transmitted vertically to the tank (1.4) of the combustor. The vertical spraying of the gas into the tank (1.4) has an important effect on the dynamics of the air drawn into the tank section by the vacuum effect and on the dynamics of the air-gas mixture on its way to the ports. In the state of art, the gas sprayed from the injector structure into the tank (1.4) was sprayed in a left-slanting pattern. Therefore, the air drawn into the tank was unstable, creating undesirable turbulence and resulting in a significant reduction in emissions. The angle a seen on the injector in Figure 6 ensures that the gas is directed towards the outlet of the injector. In the injector structure of the state of art, the gas was delivered to the outlet in an inclined manner. In these areas where the injector structure of the invention allows the gas to be directed, the flow advancing from diameter d to diameter D encounters a sudden increase in the cylindrical diameter. This creates a circumferential vortex ring along the cylindrical inner diameter in the region of diameter D. Thanks to this vortex ring, the high-velocity main flow is compressed and pushed upwards with minimum deflection, allowing the gas to be sprayed vertically in the y-axis into the tank (1.4). In this way, the drawing of air into the tank (1.4) by the vacuum effect is homogeneous and starts from the end of the injector where the gas outlet is located and provides high emission. The d diameter mentioned is in the range of minimum 0.8mm and maximum 1 ,5mm and the D diameter is in the range of minimum 1.5mm and maximum 3mm. The a angle is between a minimum of 10 degrees and a maximum of 30 degrees. In the injector structure of the invention, the length of the venturi is extended with this angle that allows the gas to be directed and the gas spray is put into a regular regime. Thanks to this angle, the gas delivered to the d-D radius region can be sprayed vertically without disturbing the dynamics of the vortex ring in this region.

The technical improvement in the spraying of the gas from the injector can be clearly seen by comparing figure 7, which shows the state of art, with figure 8, which shows the flow in the inventive injector. The principle of operation of the multi-gas burner according to the invention is that since the gas coming out of the injector has a certain pressure and is sprayed at a high speed, a negative pressure field is created inside the lower container, so that the surrounding air is drawn into the tank through the gap between the internal separator (2) and the lower tank (1.4). This creates a gas-air mixture. Due to the velocity and pressure of the gas coming out of the injector, a part of the mixture is delivered to the external ports through the channels in the form of a branched path formed by the combination of the internal separator (2) and the flame crown (3). Part of it is delivered vertically through the center hole (3.2) directly to the area where the feed for the inner ring combustion is made. The gas-air mixture from the cross channels (3.1 ) and the mixture from the center hole (3.2) are directed to the upper cap and delivered to the inner ring ports in an orderly manner over the surface of the cap. The gas coming into the inner ring ports accumulates in the full combustion ports and is ignited by the spark plug.