Burner for gas stoves or cooking appliances

Abstract

This utility model relates to a burner for a gas stove or cooker, and more particularly to a premixer burner for a gas stove. The burner includes a gas injector (12), a tubular mixer (20, 22) with a Venturi effect, and a burner support (26) closed by a cover (28). The tubular mixer includes an outer tube (20) and an inner tube (22) with a Venturi effect coaxial with the outer tube (20). The inner tube has at least one axial slot (60) in its thickness. The width of the axial slot gradually increases from the rear to the front in the inner tube (22) so that the effective passage cross-section in the tubular mixer (20, 22) gradually increases, thereby drawing in air by gas through the Venturi effect and injecting gas to produce an air-gas fuel mixture in the burner (10).

Description

Technical Field

[0001] This utility model relates to a burner for a gas stove or cooking appliance.

[0002] More specifically, this invention relates to a burner capable of achieving eco-friendly and “low-carbon” manufacturing technologies. Background Technology

[0003] This utility model particularly relates to a burner referred to as a "premixer burner" of the following type: a gas injector connected to a tubular mixer having a Venturi effect, the tubular mixer itself being connected to a support, typically in the form of a can or cylindrical cup, the open upper surface of the support being closed by an attachment cap for sealing the upper surface.

[0004] In a known manner, all or some of these components are made in a foundry by metal casting (particularly cast iron or brass).

[0005] This type of production has many drawbacks.

[0006] First, this type of production is completely unsuitable for small-batch production of burner models because it requires the use of molds corresponding to each burner stove.

[0007] In addition, production costs are very high, transportation costs related to the weight of parts and components are also very high, and the various negative environmental impacts from transportation as well as from molding and casting technologies are also very high, as are the impacts on pollutant emissions from transportation as well as from molding and casting technologies, and the high energy consumption associated with the use of molding and casting technologies as well as from transportation as well as from molding and casting technologies.

[0008] Furthermore, production requires complex machining techniques to achieve the desired venturi effect in conical or truncated conical internal profiles.

[0009] The literature FR2025027A1 proposes the use of alternative technologies to produce the burner body and its tubular mixer with Venturi effect. However, the proposed solution of cutting, folding and rolling the metal sheet is very complex and not applicable to the simple production of burner stoves with different sizes and heating capacities.

[0010] The present invention aims to overcome all or some of these disadvantages. Utility Model Content

[0011] This invention provides a burner for a gas stove or cooker, the burner including a gas injector connected to the rear end of a tubular mixer having a Venturi effect, the front end of the tubular mixer being connected to a support member.

[0012] The tubular mixer is characterized by comprising:

[0013] - An outer tube with a cylindrical internal cross-section; and

[0014] - An inner tube with the Venturi effect, coaxial with the outer tube;

[0015] -- The concave inner walls of the inner tube and the outer tube are adjacent;

[0016] -- The inner tube has a concave cylindrical inner wall; and

[0017] -- The inner tube includes at least one axial slot in its thickness, the width of which gradually increases from the rear to the front along the gas flow direction within the inner tube, so as to gradually increase the effective passage cross-section within the tubular mixer according to the flow direction of the gas axially injected into the inner tube.

[0018] Thus, through the Venturi effect, air is drawn in by the gas, which is then injected to produce an air-gas fuel mixture in the burner.

[0019] With this design of the tubular mixer, the tubular mixer can be produced very simply from two complementary sections of a commercially available coaxial metal outer tube and inner tube, and each axial slot is achieved by a material removal operation in one step (preferably, but not limited to, laser cutting technology).

[0020] Other features of the burner include:

[0021] - Each axial slot opens axially at the front free end of the inner tube;

[0022] - Each axial slot is laterally defined by two opposing edges, thus giving each axial slot a flared profile;

[0023] - Each axial slot is laterally defined by two opposing straight edges, giving each axial slot a "V" shaped profile;

[0024] - The inner tube includes multiple axial slots, which are distributed at an angle around the axis of the inner tube;

[0025] - The plurality of axial slots are distributed at an angle around the axis of the inner tube in a regular manner;

[0026] - Each axial slot is produced by laser cutting the inner tube;

[0027] - The burner includes a single yoke that carries a gas injector and is connected to the rear end of a tubular mixer. The single yoke is produced by laser cutting.

[0028] - The open upper surface of the support is closed by a cover. The support includes at least one tubular segment, the tubular segment including a crown portion of an air-gas fuel mixture outlet port and / or a crown portion of an axial air-gas fuel mixture outlet slot, the air-gas fuel mixture outlet port being formed near the upper end edge of the tubular segment, and the axial air-gas fuel mixture outlet slot being axially directed toward the upper end edge of the tubular segment;

[0029] - The axial outlet slot for the air-gas fuel mixture opens axially toward the edge and is axially closed by the cover;

[0030] - Each hole and / or each axial exit slot is produced by laser cutting;

[0031] - The support structure includes: a pressurization chamber comprising a housing for distributing an air-gas fuel mixture, the front end of a tubular mixer with a Venturi effect connected to the pressurization chamber; and a plurality of parallel horizontal blind tubular bodies, each tubular body comprising:

[0032] -- A free inlet end connected to the distributor housing, the free inlet end being supplied with an air-gas fuel mixture; and

[0033] -- At least a series of outlet orifices for an air-gas fuel mixture, the outlet orifices being distributed along the length of the tubular body;

[0034] - Each tubular body is covered by a horizontal protective plate that is offset upwards and extends above the outlet orifice for the air-gas fuel mixture;

[0035] - Each tubular body is covered by a reinforcing plate, such as a horizontal reinforcing plate, which is attached to the tubular body by a snap-on hook system. Attached Figure Description

[0036] Other features and advantages of this invention will become apparent from the following detailed description, and with reference to the accompanying drawings for understanding the description, in which:

[0037] Figure 1 This is a perspective view of an example burner according to the present invention;

[0038] Figure 2 yes Figure 1 An exploded perspective view of the burner as seen from another angle;

[0039] Figure 3 yes Figure 2 A view of the burner from another perspective;

[0040] Figure 4 It is a perspective cross-sectional view taken through a vertical horizontal plane, which passes through... Figure 1 The longitudinal axes of the outer and inner tubes of the burner;

[0041] Figure 5 It is a cross-sectional view taken through a longitudinal and vertical plane, which passes through... Figure 1 The longitudinal axes of the outer and inner tubes of the burner;

[0042] Figure 6 yes Figure 1 A large-scale detailed exploded perspective view of the outer and inner tubes of the burner.

[0043] Figure 7A yes Figure 2 A partial perspective view of the outer and inner tubes of the burner, showing the outer and inner tubes through... Figure 5 The cross-sections taken from the horizontal and vertical planes are shown;

[0044] Figure 7B It is similar to Figure 7A The view, in which, Figure 2 The outer and inner tubes of the burner are shown in cross-section taken through a transverse vertical plane, which is relative to... Figure 7A The cross-sectional plane moves forward axially;

[0045] Figure 7C It is similar to Figure 7B The view, in which, Figure 2 The outer and inner tubes of the burner are shown in cross-section taken through a transverse vertical plane, which is relative to... Figure 7B The cross-sectional plane is offset forward axially;

[0046] Figure 7D It is similar to Figure 7C The view, in which, Figure 2 The outer and inner tubes of the burner are shown in cross-section taken through a transverse vertical plane, which is relative to... Figure 7C The cross-sectional plane is offset forward axially;

[0047] Figure 7E It is similar to Figure 7D The view, in which, Figure 2 The outer and inner tubes of the burner are shown in cross-section taken through a transverse vertical plane, which is relative to... Figure 7D The cross-sectional plane is offset forward axially;

[0048] Figure 7F It is similar to Figure 7E The view, in which, Figure 2 The outer and inner tubes of the burner are shown in cross-section taken through a transverse vertical plane, which is relative to... Figure 7E The cross-sectional plane is offset forward axially;

[0049] Figure 8 Through Figure 1 A partial perspective cross-sectional view of the modified burner support and cover taken from the vertical longitudinal plane;

[0050] Figure 9 This is a perspective view of another example of a burner according to the present invention;

[0051] Figure 10 yes Figure 9 The burner shown is a partial exploded perspective view viewed from different angles. Detailed Implementation

[0052] For the purpose of describing the present invention and understanding the claims, the vertical, longitudinal, and transverse orientations of the reference frames V, L, T shown in the figures will be adopted by way of example without any limiting reference to Earth's gravity, the longitudinal axis L and the transverse axis T of which lie in a horizontal plane.

[0053] As is customary, the longitudinal axis L is oriented from the rear to the front, parallel to the direction of gas flow.

[0054] In the following description, the same, similar or analogous elements will be represented by the same reference numerals.

[0055] Figures 1 to 3 The burner 10 is shown, and the burner 10 includes, from rear to front, the following components along the longitudinal axis AL:

[0056] - Gas injector 12 and its supply connector 14;

[0057] - The yoke 16 that carries the gas injector 12;

[0058] - Rear ring 18 for securing the outer tube 20 to the yoke 16;

[0059] - Outer tube 20 and inner tube 22, the inner tube 22 is coaxial with the outer tube 20 along the longitudinal axis AL shared by the outer tube and the inner tube;

[0060] - A front ring 24 for securing the outer tube 20 to the burner support 26; and

[0061] - Burner support 26 and its top cover 28.

[0062] The yoke 16 is made from a single metal sheet laser-cut from a section of the tube.

[0063] The yoke 16 includes two parallel longitudinal arms 30 that connect the rear transverse collar 32 and the front transverse collar 34.

[0064] The rear transverse collar 32 includes a central hole 33, which allows the syringe 12 to be secured within the yoke 16 by screwing the threaded rear end 13 of the syringe 12 into the front end 15 of the connector 14.

[0065] The front transverse collar 34 includes a central hole 35 for securing the rear ring 18 to the yoke 16, for example, by welding.

[0066] In this case, the outer tube 20 is a cylindrical tube with a circular cross-section, and the rear end 19 of the outer tube 20 (with a reduced diameter in this case) is designed to be coaxially mounted inside the rear ring 18 and fixed to the rear ring 18, for example, by welding.

[0067] Similarly, the front end 21 is designed to be coaxially mounted within the front ring 24 and, for example, fixed to the front ring 24 by welding.

[0068] The support member 26 includes two coaxial tubular sections (in this case, cylindrical tubes with circular cross-sections) along the vertical axis AV. The two coaxial tubular sections include an outer tubular section 36 with a larger diameter and an inner tubular section 38 with a smaller diameter.

[0069] Each tubular segment, 36 or 38, is produced by laser cutting tubes of the corresponding dimensions.

[0070] Two coaxial tubular sections 36 and 38 are coaxially mounted and fixed to each other via an annular base plate 40, which is also made of laser-cut metal sheet.

[0071] Plate 40 includes a diameter crossbar with a central hole 41, which is used to secure support 26 to any corresponding support, for example by bolts or screws.

[0072] Two coaxial tubular sections 36 and 38 define an annular passage or channel 42 between them for allowing an air-gas mixture to pass through the support 26.

[0073] For this purpose, the lower portion of the outer tubular section 36 includes an opening 44 produced by laser cutting, so that the front ring 24 can be fixed to the outer tubular section 36, for example, by welding.

[0074] Therefore, the annular space 26 is connected to the outer tube 20, and the annular space 26 is supplied with an air-gas mixture through the front ring 24 and the orifice 44.

[0075] Cover 28 “closes” the upper end surface of the annular space 42 at the upper end.

[0076] For this purpose, cover 28 is made in the form of a ring plate produced by laser cutting.

[0077] In order to position and hold the annular cover 28 on the upper end of the support 26, the annular cover 28 includes an outer recess 27 and an inner recess 29.

[0078] If necessary, the outer notch 27 accommodates the axial lug 37 with a slight interference fit, the axial lug 37 extending vertically upward from the upper axial end edge 46 of the outer tubular section 36.

[0079] If necessary, the recess 29 engages with the axial lug 39 in a slightly interference fit, the axial lug 39 extending vertically upward from the upper axial end edge 48 of the inner tubular section 38.

[0080] Here, the cover 28 is installed and secured to the support 26 using tenons 37, 39 and mortises 27, 29.

[0081] In order to form an outlet orifice for the air-gas mixture for forming the corresponding flame in the upper part of the support 26, the outer tubular section 36 here includes, without limitation, a series of axial slots 50 (arranged at an angle in the regular crown), the axial slots 50 axially opening to the upper edge 46 and being closed by the cover 28.

[0082] In addition, but not limited to, in order to form other combustion orifices for the air-gas mixture to form a corresponding flame in the upper part of the support 26, the inner tubular section 38 here includes, without limitation, a series of axial slots 52 (arranged at an angle in the regular crown), the axial slots 52 axially opening to the upper edge 48 and being closed by the cover 28.

[0083] The presence or absence of axial slots, and the number and / or distribution of axial slots, depend particularly on the required heating power.

[0084] As an alternative not shown, each gas outlet orifice may be formed by a blind orifice or hole in tubular sections 36, 38, near the cover 28.

[0085] Advantageously, each tubular segment 36, 38 and its various functional components (finger 37, finger 39, orifice 44, slot 50, slot 52) ​​are produced by laser cutting.

[0086] According to the main features of this utility model, a tubular mixer with Venturi effect is supplied with gas and air at its axial rear end to form an air-gas mixer. The air-gas mixer is composed of a combination of tubes 20 and 22, with tube 20 forming the outer tube of the shell and tube 22 forming the inner tube with Venturi effect.

[0087] The design of the inner tube 22 allows it to be produced simply and economically by laser cutting the tube or tube segment, in which case the tube or tube segment is a cylindrical tube or cylindrical tube segment with a circular cross-section.

[0088] The dimensions of the two tubes allow the inner tube 22 to be accommodated without gaps along the axial direction within the outer tube 20.

[0089] The inner tube 22 is defined by its convex cylindrical outer wall 54, which is adjacent to the concave cylindrical inner wall 58 of the outer tube 20.

[0090] The concave inner wall 56 of the inner tube 22 is cylindrical.

[0091] According to the flow direction of the gas injected axially into the inner tube 22 (from rear to front) and in order to gradually increase the effective flow cross-section within the tubular mixer 20-22, the inner tube includes a series of three axial slots 60 with a Venturi effect.

[0092] Here, the three slots 60 are evenly separated at an angle of 120 degrees.

[0093] Each axial slot 60 is formed by penetrating the wall thickness of the inner tube 22.

[0094] Each axial slot 60 opens axially at the front free end 23AV of the inner tube 22.

[0095] Each slot 60 is laterally defined by two opposing edges 62, thereby giving each slot 60 a flared profile.

[0096] Each edge 62 is straight, thus giving each slot a flared “V” profile.

[0097] For example in Figure 5 and Figures 7B to 7E As can be seen, the “width” L of each axial slot 60 gradually increases from the rear to the front in the direction of gas flow within the inner tube 22.

[0098] Here, the width L refers to the average distance, measured circumferentially in the transverse plane, that separates the two opposing edges 62 of the slot 60.

[0099] like Figure 1 , Figure 4 and Figure 5As shown, the rear free end section of the inner tube 22 protrudes axially beyond the rear axial end of the outer tube 20.

[0100] The inner tube 22 includes three V-shaped notches 64 at its rear axial end 23AR, the three V-shaped notches 64 leading to the rear axial end edge 23AR.

[0101] The purpose of these notches is to gradually reduce the cross-section of the passage, thereby accelerating the flow of gas out of the syringe and creating negative pressure. This negative pressure draws (pulls) outside air into the passage. This is the beginning of the Venturi effect.

[0102] Depending on the burner's power, this section can be adjusted by moving it closer to the injector 12 to regulate the proportion of incoming air.

[0103] according to Figure 8 The alternative embodiment of the burner support and cover shown only has an outer tubular section 36 with a larger diameter including an axial slot 46.

[0104] Many variations are possible without departing from the general definition of this utility model.

[0105] For example, pipes or pipe sections 20, 22, 36, and 38 do not necessarily have to have a circular cross-section, but can have a square cross-section. Pipes or pipe sections 20, 22, 36, and 38 are always produced by laser cutting the corresponding pipes with the corresponding square cross-sections.

[0106] Now will describe Figure 9 and Figure 10 Another example of a burner shown is more specifically suited for "grilling" cooking.

[0107] In this embodiment, the design and reference of the components constituting the tubular mixer with Venturi effect according to the present invention are described. Figures 1 to 8 The components described are identical, similar, or the same, and the same elements and parts are indicated by the same reference numerals.

[0108] The front end 21 is designed to be coaxially mounted inside the front ring 24 and fixed to the front ring 24, for example by welding. The front ring 24 here belongs to the right-angled tubular bend 70, and the downstream section 72 of the right-angled tubular bend 70 extends vertically.

[0109] The support member 26 includes a pressurization chamber 74 for distributing an air-gas fuel mixture, with the front end of a tubular mixer having a Venturi effect connected to the pressurization chamber 74.

[0110] For this purpose, the pressurization chamber 74 includes a rectangular horizontal housing 76 that extends horizontally and has an inlet orifice 78 formed in its lower wall 79, and the downstream section 72 of the elbow 70 is connected and fixed to the inlet orifice 78, for example by welding.

[0111] The housing 76 is made of steel tubing with a corresponding cross-section.

[0112] In one of the two vertical sidewalls 80 of the housing 76, the housing 76 includes a series of outlet orifices 82 (in this case, five outlet orifices 82) evenly distributed along the wall 80.

[0113] The function of the pressurization chamber 74 is to distribute the air-gas fuel mixture through the outlet orifice 82 into a plurality of parallel horizontal blind tubular bodies 84. Each tubular body 84 constitutes a tubular burner and includes a free inlet end 86 connected to the outlet orifice 82 of the housing 76. The free inlet end 86 is fixed to the outlet orifice 82, for example, by welding.

[0114] Each tubular body 84 here includes two parallel series of outlet orifices 88 along its entire length for forming the corresponding flame of the air-gas fuel mixture, the two parallel series of outlet orifices 88 being evenly distributed along the tubular body 84.

[0115] Each series of orifices 88 is laterally offset relative to the central vertical plane of the tubular body 84.

[0116] To protect the outlet orifice 88 and prevent it from being blocked by cooking residues, for example, each tubular body 84 is covered by a horizontal protective plate 90 that is offset upward and extends above the outlet orifice 88 for the air-gas fuel mixture.

[0117] Each protective plate 90 is removably mounted and secured to the associated tubular body 84 by means of a mounting rod 92.

[0118] Each rod 92 is here fixed to the upper part of the tubular body 84 by welding and extends in the middle vertical plane.

[0119] Each rod includes a series of hooks 96 in its upper edge 94, which can be received in complementary notches 98 formed in the protective plate 90 to achieve a reliable "snap-on" type assembly.

[0120] In addition, the protective plate 90 hooked onto the mounting bracket 92 in this way helps to enhance the rigidity of the associated burner tube 84.

Claims

1. A burner (10) for a gas stove or cooker, the burner comprising a gas injector (12) connected to the rear end of a tubular mixer having a Venturi effect, the front end (21) of the tubular mixer being connected to a support (26). Its features are, The tubular mixer includes: An outer tube (20) having a cylindrical internal cross-section; and An inner tube (22) with the Venturi effect is coaxial with the outer tube (20); The inner tube is adjacent to the concave inner wall (58) of the outer tube (20); The inner tube has a concave cylindrical inner wall (56); and The inner tube includes at least one axial slot (60) in its thickness, the width (L) of which gradually increases from the rear to the front along the gas flow direction within the inner tube (22) to gradually increase the effective passage cross-section within the tubular mixer according to the flow direction of the gas axially injected into the inner tube (22). Thus, through the Venturi effect, air is drawn in by the gas, which is injected to produce an air-gas fuel mixture in the burner (10).

2. The burner (10) according to claim 1, characterized in that, Each axial slot (60) opens axially at the front free end (23AV) of the inner tube (22).

3. The burner (10) according to claim 1 or 2, characterized in that, Each axial slot (60) is laterally defined by two opposing edges (62), thereby giving each axial slot a flared profile.

4. The burner (10) according to claim 3, characterized in that, Each axial slot (60) is laterally defined by two opposing straight edges (62), thereby giving each axial slot a "V" shaped profile.

5. The burner (10) according to claim 1 or 2, characterized in that, The inner tube (22) includes a plurality of axial slots (60) which are distributed at an angle around the axis (AL) of the inner tube (22).

6. The burner (10) according to claim 5, characterized in that, The plurality of axial slots (60) are distributed at an angle around the axis (AL) of the inner tube (22) in a regular manner.

7. The burner (10) according to claim 1 or 2, characterized in that, Each axial slot (60) is produced by laser cutting the inner tube (22).

8. The burner (10) according to claim 1 or 2, characterized in that, The burner includes a single yoke (16) carrying the gas injector (12), the single yoke being connected to the rear end of the tubular mixer having a Venturi effect, the single yoke being produced by laser cutting.

9. The burner (10) according to claim 1 or 2, characterized in that, The open upper surface of the support (26) is closed by a cover (28). The support (26) includes at least one tubular segment (36, 38), the tubular segment including a crown portion of an air-gas fuel mixture outlet port and / or a crown portion of an axial air-gas fuel mixture outlet slot (50, 52), the air-gas fuel mixture outlet port being formed near the upper end edge (46, 48) of the tubular segment, the axial air-gas fuel mixture outlet slot being axially directed toward the upper end edge (46, 48) of the tubular segment (36, 38).

10. The burner (10) according to claim 9, characterized in that, The axial air-gas fuel mixture outlet slot (50, 52) extends axially toward the upper end edge and is axially closed by the cover (28).

11. The burner (10) according to claim 9, characterized in that, Each air-gas fuel mixture outlet port and / or each axial air-gas fuel mixture outlet slot is produced by laser cutting.

12. The burner (10) according to claim 1 or 2, characterized in that, The support member includes: A pressurization chamber (74) comprising a housing (76) for distributing the air-gas fuel mixture, wherein the front end (21) of the tubular mixer having a Venturi effect is connected to the pressurization chamber; and Multiple parallel horizontal blind tubular bodies (84), each tubular body comprising: A free inlet end (86) connected to the distributor housing (76), said free inlet end being supplied with an air-gas fuel mixture; and At least a series of outlet orifices (88) for the air-gas fuel mixture, the outlet orifices being distributed along the length of the tubular body (84).

13. The burner (10) according to claim 12, characterized in that, Each tubular body (84) is covered by a horizontal protective plate (90) that is offset upward and extends above the outlet orifice (88) for the air-gas fuel mixture.

14. The burner (10) according to claim 12, characterized in that, Each tubular body (84) is covered by a horizontal reinforcing plate.

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