Combustion film for gas burner
By using braided base fabric and monofilament wire reinforcement design in the burner combustion membrane, the flame disengagement, overheating and thermal insulation function reduction occurring in the non-optimal combustion process of the combustion membrane, and better thermal insulation, shape retention ability and combustion performance are achieved.
Patent Information
- Application Number
- CN202380063700.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-07-26
- Filing Date
- 2023-07-25
- Publication Date
- 2025-06-13
AI Technical Summary
During the non-optimal combustion process, existing burner combustion membranes are prone to flame disengagement, local overheating, uneven temperature, uneven gas flow rate and reduced heat insulation function, resulting in high combustion noise, limited high temperature resistance and uncontrollable flame phenomena.
A combustion film reinforced by braided base fabric composed of metal wire and a single-filament wire is woven by a loom to integrate multiple metal fiber bundles with a fiber thickness of less than 50 microns and a single-filament wire with a monofilament thickness of more than 100 microns to form a combustion film with porousity, thermal insulation and thermal inertia.
The fiber distribution and rigidity requirements of the combustion membrane are coordinated, the insulation and shape retention capabilities of the combustion membrane are improved, the flame separation risk and uneven gas flow rate problems are reduced, and the combustion performance and equipment's high temperature resistance are improved.
Smart Images
Figure CN120153208A_ABST
Abstract
Description
[0001] Specification
[0002] The present invention relates to a combustion membrane for a burner, in particular for a fully or partially premixed burner, such as for a boiler, a swimming pool heater, a hot air generator or an oven for an industrial process.
[0003] Burners of the prior art include a combustion membrane having:
[0004] - an inner surface in fluid communication with a supply system,
[0005] - a diffusion layer forming the outer surface (or combustion surface) of the membrane, intended to face the combustion chamber,
[0006] Combustible gas or a mixture of combustible gas and combustion-supporting air (in the following description, the term "gas" means "combustible gas" and "mixture of combustible gas and combustion-supporting air") is conveyed through the combustion membrane in the form of a flame pattern on the combustion surface, and combustion occurs outside the combustion membrane.
[0007] In addition, a distributor can be provided upstream (with reference to the flow direction of the gas) of the diffusion layer in order to distribute the gas to the combustion membrane in a desired manner. Known distributors are generally made of a wall having a plurality of through-holes, for example made of a perforated metal plate, and can form the "inner" layer of the combustion membrane or, alternatively, a component spaced apart from the combustion membrane.
[0008] The heat generated by combustion is guided by hot combustion gases (convection) and thermal radiation to a heat exchanger for heating a fluid, such as water and / or sanitary water that is later conveyed to utilities (e.g., heating systems for industrial processes, living spaces, etc.).
[0009] In order to use the burner and the combustion system ideally and satisfactorily, on the one hand, it is desirable to change the heating power of the burner and the gas flow rate through the combustion membrane in a controlled manner, and on the other hand, it is desired to ensure that the operation is as safe, quiet and durable as possible.
[0010] In order to better meet the above needs, it is necessary to reduce or prevent some phenomena that may occur during non-optimal combustion processes, including:
[0011] - local or large-scale detachment of the flame from the combustion surface,
[0012] - local or large-scale overheating of the combustion membrane,
[0013] - highly non-uniform distribution of the temperature of the combustion membrane,
[0014] - highly non-uniform distribution of the gas flow rate through the combustion membrane,
[0015] - Low or reduced heat insulation function of the combustion membrane or single-layer combustion membrane during burner operation.
[0016] These adverse phenomena can lead to high combustion noise, limit the high-temperature resistance ability of the burner, damage to the burner's own structure, especially damage to the metal sheet components of the combustion membrane, and the occurrence of uncontrollable flame phenomena.
[0017] The detailed description of the relevant causes in the aforementioned negative phenomena and the destructive effects on satisfactory combustion have been widely described in the technical literature.
[0018] There have already been attempts to meet the above-mentioned requirements by making the outer side of the combustion membrane into a metal fabric or metal mesh, so as to achieve the expected effects of heat insulation of the combustion membrane and thermal protection of the upstream burner part of the combustion membrane, and to achieve a better distribution of the gas permeability of the combustion membrane, and ultimately achieve better flame stability.
[0019] The metal fabric and metal mesh most suitable for manufacturing the combustion membrane are made of multi-fiber silk or yarn of metal fibers with a diameter less than 50 microns, so as to ensure the "covering" function of the combustion membrane, and to achieve good pore distribution and heat insulation function through a certain thickness of the fabric or mesh (due to the increase in the number of single metal fibers).
[0020] So far, one of the problems not fully solved by burners with combustion membranes made of fabric or metal mesh involves the deformation and preservation behavior of the deformed layer of the combustion membrane. In addition to the actual combustion membrane, all burners of this type provide a more or less rigid external structure (external metal mesh or external perforated metal plate) according to the three-dimensional shape and size of the combustion surface required by the application. However, in the presence of an external structure for supporting the combustion membrane, in the area extending between the mechanical connection positions of the fabric (or metal mesh) and the supporting structure, the mesh or fabric optimized for combustion performance usually does not conform to the desired local shape, which ideally should be a semi-rigid membrane rather than a freely flexible membrane.
[0021] Therefore, the object of the present invention is to provide a new and innovative combustion surface and combustion membrane for a gas burner, and a gas burner having features that avoid at least some of the disadvantages of the prior art.
[0022] These and other objects are achieved by the combustion membrane for a gas burner described in claim 1. Some advantageous embodiments are the subject of the dependent claims.
[0023] According to one aspect of the present invention, the combustion membrane of a gas burner has an inner side to which combustible gas is delivered and an outer side where the combustible gas burns once it passes through the combustion membrane. The combustion membrane includes a base fabric having two opposite fabric surfaces, and the two opposite fabric surfaces respectively form a combustion surface exposed on the outer side and an inner surface facing the inner side, wherein:
[0024] – The base fabric forms a braid made of metal wires, the braid including warp threads and weft threads transverse to the warp threads. The fabric is manufactured on a loom (different from a net which is considered excluded from the definition of "fabric"). Both the warp threads and the weft threads are bundles of multiple metal fibers with a fiber thickness less than 50 microns.
[0025] – The combustion membrane further includes multiple monofilament metal wires with a monofilament thickness greater than 100 microns, which are directly integrated into the base fabric by weaving on a loom to reinforce the combustion membrane.
[0026] This reconciles, in a new and advantageous way, the contradiction between the need to arrange as many fibers as possible (the fibers having the smallest possible thickness and being evenly or continuously distributed to ensure the porosity, heat insulation, and thermal inertia of the combustion membrane) and the opposite need, that is, the need to impart greater rigidity to the combustion membrane and a certain ability to maintain its shape in the plane of the base fabric.
[0027] To better understand the present invention and its advantages, some non - limiting embodiments of the present invention will be described below with reference to the accompanying drawings, in which:
[0028] Figure 1 is a schematic diagram of a gas combustion system, for example for a boiler, whose burner is equipped with a combustion membrane.
[0029] Figure 2 and Figure 3 is a perspective view and a sectional view of an exemplary burner equipped with a combustion membrane.
[0030] Figure 3A is an enlarged schematic cross - sectional view of a combustion membrane according to an embodiment of the present invention, further showing an optional additional support layer.
[0031] Figure 4A and Figure 4B are views of two sides of the metal fabric of a combustion membrane according to an embodiment of the present invention.
[0032] Figure 4C shows Figure 4A an enlarged detail view of, in which the monofilament wires arranged according to the weaving pattern are highlighted.
[0033] Figure 4D shows Figure 4B an enlarged detail view of, in which the monofilament wires arranged according to another weaving pattern different from Figure 4C are highlighted.
[0034] Figure 5A shows the first side of the metal fabric of a combustion membrane according to another embodiment of the present invention.
[0035] Figure 5B showsFigure 5A An enlarged detail view, in which the monofilaments arranged according to the knitting pattern are highlighted,
[0036] Figure 5C shows Figure 5A an enlarged detail view of the second side of the fabric in Figure 5B in which the monofilaments arranged according to another knitting pattern different from
[0037] Figure 6 shows multifilament wires bonded by water-soluble bonding wires,
[0038] Figure 7 shows wavy or "crimped" multifilament wires bonded by water-soluble bonding wires,
[0039] Figure 8 shows the twisted and "hairy" (so-called hairy spun yarn) multifilament wires of the metallic fabric according to the embodiment.
[0040] Figure 9 Schematically depicts a monofilament helically extending around a multifilament wire.
[0041] Figure 10 shows a reticulated combustion membrane according to another aspect of the present invention.
[0042] Detailed description of the combustion system 1
[0043] Referring to Figure 1 , a gas combustion system 1 for, such as, a boiler, comprising:
[0044] a burner 2 that generates heat by combustion of a combustible gas and combustion-supporting air,
[0045] a supply system 3 for supplying a gas or a mixture of a combustible gas and combustion-supporting air to the burner 2, the supply system 3 including a gas control device 4 for controlling the flow of the combustible gas (e.g., an electrically controlled gas valve, or a gas delivery device, or a gas suction device), and an air control device 5 for controlling the flow of the combustion-supporting air (such as, an air delivery device or an air suction device, a fan, a radial fan, an air valve or a gate air valve, if any),
[0046] an electric ignition device 6 for igniting the combustibles, for example, an ignition electrode adapted to generate a spark,
[0047] It is possible that an ionization sensor 7 is arranged in the combustion zone 8 of the burner 2 and is adapted to provide an ionization signal that varies depending on the combustion state of the burner 2,
[0048] An electronic control unit 9 connected to a supply system 3, an ignition device 6, and an ionization sensor 7, the electronic control unit 9 having a combustion control module 10 adapted to control the ignition device 6 and the supply system 3 in accordance with an operating program and user commands and in accordance with an ionization signal.
[0049] Detailed description of the burner 2
[0050] According to an embodiment ( Figure 2 、 Figure 3 ), the gas burner 2 includes:
[0051] - A support wall 11 forming one or more inlet channels 12 for introducing a combustible gas 13 (a mixture with combustion air) into the burner 2,
[0052] - A tubular combustion membrane 14, for example cylindrical, coaxial with the longitudinal axis 15 of the burner 2, having a first end connected to the support wall 11 and in fluid communication with the inlet channels 12, a second end closed by a closing wall 16, and perforations for the gas 13 or the gas - air mixture to flow from the inside of the burner 2 to the outside 17 of the combustion membrane 14, where combustion occurs on the outside 17 of the combustion membrane 14 (combustion zone 8).
[0053] Figure 3 A tubular silencing attachment (not numbered) is also shown in the burner 2 in
[0054] which is an optional part and can have a reduced size or be completely eliminated.
[0055] According to another embodiment, the combustion membrane 14 can be substantially flat (e.g., planar), or curved or convex, or non - tubular or non - cylindrical, and has a perimeter connected to the support wall 11 and in fluid communication with the inlet channels 12, and perforations for the gas 13 or the gas - air mixture to flow from the inside of the burner 2 to the outside 17 of the combustion membrane 14, where combustion occurs on the outside 17 of the combustion membrane 14 (combustion zone 8).
[0056] Detailed description of the combustion film 14
[0057] The combustion membrane 14 has an inner side 18 and an outer side 17. A combustible gas 13 is delivered to the inner side 18 and burns on the outer side 17 once it has passed through the combustion membrane 14. The combustion membrane 14 includes a base fabric 21 which has two opposite fabric surfaces 19, 20, which respectively form a combustion surface 19 exposed on the outer side 17 and an inner surface 20 facing the inner side 18. Wherein the base fabric 21 forms a wire braid 22, including multifiber warp threads 28 and multifiber weft threads 29 transverse to the multifiber warp threads 28. The base fabric 21 is manufactured on a loom (different from a net which is considered to be excluded from the definition of "fabric"), and each of the multifiber warp threads 28 and the multifiber weft threads 29 includes a bundle of multiple metal fibers 22' having a fiber thickness of less than 50 microns.
[0058] According to the present invention, the combustion membrane 14 further includes multiple monofilament wires 25 with a monofilament thickness greater than 100 microns, which are directly integrated into the base fabric 21 by weaving on a loom to reinforce the combustion membrane 14.
[0059] This reconciles, in a new and advantageous way, the need to arrange as many fibers 22' as possible (the fibers 22' having a thickness that is reduced as much as possible and being evenly or continuously distributed to ensure the porosity, heat insulation, and thermal inertia of the combustion membrane 14), with the opposite need, i.e., the need to make the combustion membrane 14 have greater rigidity and a certain shape retention ability in the plane of the base fabric.
[0060] According to an embodiment, the flexural strength of the monofilament wire 25 is 50% or 75% or 100% greater than the flexural strength of the warp threads 28 and weft threads 29 of the base fabric 21.
[0061] During the pressing and forming process of the combustion membrane 14, in order to achieve the movement set by the press, the monofilament wire 25 (with a cross-section larger than that of a single fiber of the multifiber wire) undergoes greater deformation and can reach the yield point limit, thus obtaining an irreversible plastic deformation component. On the other hand, the same larger cross-section of the monofilament wire 25 increases the resistance to its elastic bending, thereby further contributing to maintaining the shape set by the press.
[0062] According to an embodiment ( Figure 9 ), the multifiber wire (for example, as described with reference to the multifiber wire 22) spirally extends around one or more or each monofilament wire 25. The monofilament wire 25 and the multifiber wire can be twisted together, or the latter can be wound around the former.
[0063] According to an embodiment, the monofilament wires 25 form a braid of monofilament warp threads 26 and monofilament weft threads 27 transverse to the monofilament warp threads 26.
[0064] The combustion membrane 14 has a single-layer structure and includes, by weaving on a loom, the base fabric 21 and a braid of monofilament wires 25.
[0065] The monofilament wires 25 can respectively directly extend along and be adjacent to the corresponding multi-fiber warp threads 28 or multi-fiber weft threads 29 of the base fabric 21.
[0066] The monofilament wires 25 can each precisely extend according to the weaving pattern of the multi-fiber warp threads 28 or multi-fiber weft threads 29 of the base fabric 21 associated therewith.
[0067] The monofilament warp threads 26 can be located at each warp pitch of the base fabric 21 ( Figure 5C ), or preferably at multiple warp pitches of the base fabric 21 ( Figure 4C , Figure 4D , Figure 5A ), or advantageously at every other warp pitch of the base fabric 21 ( Figure 4C , Figure 5B ).
[0068] Similarly, the monofilament weft threads 27 can be located at each weft pitch of the base fabric 21 ( Figure 5C ), or preferably at multiple weft pitches of the base fabric 21 ( Figure 4C , Figure 4D , Figure 5A ), or advantageously at every other weft pitch of the base fabric 21 ( Figure 4C , Figure 5B ).
[0069] According to an embodiment, the monofilament weft threads 27 are woven into the base fabric 21 by a dedicated monofilament feeder, which is different from the feeder of the multi-fiber weft threads 29 of the base fabric 21. This allows for the control of weaving on an industrial scale, ensuring its quality and using standard weaving components.
[0070] The monofilament wires 25 have a thickness or diameter extending transversely to their longitudinal direction, ranging from (greater than) 100 microns to 250 microns, preferably 160 microns to 250 microns, such as 200 microns, depending on the acceptable density of the monofilament wires 25 and the stiffness and plastic deformation ability of the required combustion film 14.
[0071] Description of the surface profile characteristics of the base fabric 21
[0072] According to one aspect of the present invention, both fabric surfaces 19, 20 form high-raised ribs 23 alternating with low-raised valleys 24, and the ribs 23 and valleys 24 extend in at least one direction in the plane of the base fabric 21 by more than the space occupied by at least three consecutive warp threads in the weft direction and more than the space occupied by at least three consecutive weft threads in the warp direction.
[0073] Due to the alternation of the high-raised ribs 23 and the low-raised valleys 24, the metallic base fabric 21 of the combustion membrane 14 achieves the technical effect of discrete, repetitive but discontinuous spacers. The thickness of the fabric itself is not completely filled with metallic material, which improves the heat insulation ability and allows gas to distribute through the metallic fabric not only in the direction perpendicular to the plane of the fabric but also within the plane of the fabric itself.
[0074] This avoids overheating of the combustion membrane 14, improves the heat insulation of the combustion membrane 14, reduces the risk of flame separation, and improves the flow rate distribution of the gas 13 passing through the combustion membrane 14.
[0075] According to an embodiment, at the ribs 23, at least one of the fabric surfaces 19, 20 forms one or more floats 30 (i.e., the multi-fiber weft 29 passes over several consecutive multi-fiber warps 28, or the multi-fiber warp 28 passes over several consecutive multi-fiber wefts 29).
[0076] According to an embodiment, at the valleys 24, at least one of the fabric surfaces 19, 20 forms a region without floats or with floats shorter than those at the ribs 23 of the same fabric surface (where "shorter" means "the number of consecutive multi-fiber warps / wefts through which one multi-fiber warp / weft passes is less than that of the floats at the ribs 23").
[0077] Description of the permeability characteristics of the fabric 21
[0078] The base fabric 21 has air permeability, and local first regions 31 with low air permeability alternate with local second regions 32 with higher air permeability than the first regions 31.
[0079] According to an embodiment, the first regions 31 and the second regions 32 extend in at least one direction on the plane of the base fabric 21 by a distance greater than the space occupied by at least three consecutive multi-fiber warps 28 in the weft direction and greater than the space occupied by at least three consecutive multi-fiber wefts 29 in the warp direction.
[0080] According to an embodiment, in the first regions 31, the base fabric 21 forms one or more floats 30; while in the second regions 32, the base fabric 21 forms a region without floats or with floats shorter than the floats 30 in the first regions 31 (i.e., the number of consecutive multi-layer warps / wefts through which one multi-layer warp / weft passes is less than that of the floats 30 in the first regions 31).
[0081] According to an embodiment, at the floats 30 in the first regions 31, the wire 22 forming the floats 30 is locally widened in width relative to the wire 22 at the second regions 32.
[0082] For example, the difference in air permeability between the first regions 31 and the second regions 32 is visible and can be verified by light as the difference in light transmission through the base fabric 21.
[0083] The first local region 31 with low permeability alternates with a second local region 32 having a higher permeability than the first local region 31, which has proven beneficial in reducing the risk of flame detachment and in achieving a better gas flow rate distribution over the combustion membrane 14. Description of the exemplary embodiment of the base fabric 21
[0084] According to an embodiment ( Figure 5A , Figure 5B , Figure 5C ), ribs 23 and valleys 24 define a repeating pattern of a first row 33 and a second row 34, the first row 33 being preferably straight and inclined with respect to the weft and warp directions in a first direction, the second row 34 being preferably straight and inclined with respect to the weft and warp directions in a second direction transverse to the first direction, wherein the first row 33 and the second row 34 intersect, thereby defining a diamond-shaped region 35, wherein the two diagonals (line segments connecting opposite vertices of the diamond) of the diamond-shaped region 35 are parallel to the weft and warp directions of the base fabric 21.
[0085] More preferably, each diamond-shaped region 35 is traversed by at least 1 or 2, but preferably more than two, monofilament warp threads 26 and at least 1 or 2, but preferably more than two, monofilament weft threads 27.
[0086] In terms of porosity, heat insulation, deformability of various three-dimensional shapes, and industrial weaving, the shape of the base fabric 21 so constructed (independent of the monofilament lines) has proven to have surprising advantages.
[0087] The braiding of the larger monofilament lines 25 and their multiple presence in each diamond-shaped region 35 provides further rigidity and the ability to maintain a three-dimensional deformed state, which is desired for this type of combustion membrane 14.
[0088] In a burner, the combustion membrane 14 may but does not have to be supported and in contact with an additional support layer 38 (e.g., a perforated layer or a metal support mesh) disposed on the inner side 18 of the combustion membrane 14.
[0089] Description of the multi-filament wire 22
[0090] According to an embodiment, the multifilament wire 22 comprises a bundle of metal fibers, such as an unspun bundle of metal fibers, or a bundle of parallel or woven or spun or twisted metal fibers, such as of the "long fiber filament" or "short fiber filament" type.
[0091] The multifilament wire 22 may be at least or only initially bonded by an adhesive, such as a water-soluble or water-insoluble bonding thread 37, such as PVA or polyester, or by a water-soluble or water-insoluble adhesive, such as a polymer.
[0092] According to an embodiment, the fabric 21 is a "heavy" or "thick" fabric, which means that the weight per unit area of the fabric is equal to or greater than 1.3 kg / m 2 of the fabric, for example, in the range of 1.3 kg / m 2 to 1.6 kg / m 2 and preferably 1.3 kg / m 2 .
[0093] Alternatively, for economic advantages, the fabric 21 is a "semi - heavy" or "semi - thick" fabric, meaning that the weight per unit area of the fabric is in the range of 1.2 kg / m 2 to 1.3 kg / m 2 and preferably in the range of 1.26 kg / m 2 to 1.28 kg / m 2 .
[0094] Advantageously, the wire 22 is a yarn with a weight per unit length in the range of 0.8 g / m to 1.4 g / m, advantageously 0.9 g / m to 1.1 g / m, for example 1 g / m.
[0095] Advantageously, the wire 22 is composed of fibers 22' with a diameter in the range of 30 microns to less than 50 microns, for example about 40 microns.
[0096] According to an embodiment, the material of the wire 22 or the metal fiber 22' can be, for example, ferritic steel or FeCrAl alloy, such as an alloy doped with yttrium, hafnium, zirconium.
[0097] For example, the wire 22 can be a FeCrAl alloy yarn doped with yttrium, hafnium, zirconium, weighing 1 g / m, composed of fibers with a diameter of 40 microns, untwisted, possibly crimped (wavy), held by a binder thread 37 (possibly a PVA or polyester binder thread), and having, for example, the following "doping" composition:[[]]
[0098]
[0099] According to another embodiment, the material of the wire or the metal fiber can be, for example, ferritic steel or FeCrAl alloy, for example, also containing yttrium, hafnium, zirconium.
[0100] For example, the multi - fiber wire 22 can be a FeCrAl alloy yarn doped with yttrium, hafnium, zirconium, weighing 1 g / m, composed of fibers with a diameter of 40 microns, spun (for example, 30 to 150 twists per meter), possibly having fiber ends protruding from the wire ("hairy"), the fibers being shorter than the yarn (for example, the fiber length is in the range of 7 cm to 30 cm), not necessarily but possibly held by a binder thread 37 (the binder thread 37 may be made of PVA or polyester), and having, for example, the same "doping" composition as shown in the above table.
[0101] Description of the monofilament wire 25
[0102] According to an embodiment, the monofilament wire 25 may be, for example, an undoped or yttrium-, hafnium-, zirconium-doped FeCrAl alloy wire, which may have the following "doped" composition, for example:
[0103]
[0104] For example, the material of the monofilament wire 25 may be ferritic steel or an FeCrAl alloy, which may also contain yttrium, hafnium, and zirconium, for example.
[0105] Description of the combustion film 14 of the mesh 121
[0106] According to another aspect of the present invention ( Figure 9 ), the combustion film (14) for a gas burner (2) has an inner side (18) and an outer side (17), a combustible gas (13) is supplied to the inner side (18), and combustion occurs on the outer side (17) once the combustible gas has passed through the combustion film (14). The combustion film (14) further includes a bottom mesh (121) (different from the fabric manufactured on the loom described above), the bottom mesh having two opposite mesh surfaces (19, 20), which respectively form a combustion surface (19) exposed on the outer side (17) and an inner surface (20) facing the inner side (18), wherein the bottom mesh (121) forms a braid of one or more multifilament wires (22), each braid including a bundle of a plurality of metal fibers (22') with a fiber thickness of less than 50 microns, and wherein the combustion film (14) further includes a plurality of monofilament wires (25) with a monofilament thickness greater than 100 microns, the plurality of monofilament wires (25) being directly inserted into the bottom mesh (121) to reinforce the combustion film (14).
[0107] Drawings in the specification and reference numerals in the specification
[0108] Gas combustion system 1;
[0109] Burner 2;
[0110] Supply system 3;
[0111] Gas control device 4;
[0112] Air control device 5;
[0113] Electric ignition device 6;
[0114] Ionization sensor 7;
[0115] Combustion area 8;
[0116] Electronic control unit 9;
[0117] Combustion control module 10;
[0118] Support wall 11;
[0119] Inlet passage 12;
[0120] Combustible gas 13;
[0121] Combustion film 14;
[0122] Longitudinal axis 15;
[0123] Enclosing wall 16;
[0124] Outer side 17;
[0125] Inner side 18;
[0126] Combustion surface 19;
[0127] Inner surface 20;
[0128] Base fabric;
[0129] Wire 22;
[0130] Metal fiber 22';
[0131] Rib 23;
[0132] Valley 24;
[0133] Monofilament 25;
[0134] Monofilament warp 26;
[0135] Monofilament weft 27;
[0136] Multifilament warp 28;
[0137] Multifilament weft 29;
[0138] Float line 30;
[0139] First region with increased permeability 31; Second region with increased permeability 32; First row 33;
[0140] Second row 34;
[0141] Diamond-shaped region 35;
[0142] Warp direction 36_O;
[0143] Weft direction 36_T;
[0144] Adhesive line 37;
[0145] Support layer 38;
[0146] Bottom net 121.
Claims
1. A combustion membrane (14) for a gas burner (2), the combustion membrane (14) having an inner side (18) and an outer side (17), the inner side (18) to which a combustible gas (13) is supplied, and once the combustible gas passes through the combustion membrane (14), the combustible gas (13) burns on the outer side (17), the combustion membrane (14) comprises: a base fabric (21) having two opposite fabric surfaces (19, 20), the two opposite fabric surfaces (19, 20) forming a combustion surface (19) exposed on the outer side (17) and an inner surface (20) facing the inner side (18) respectively, wherein the base fabric (21) forms a wire braid (22), the wire braid (22) comprising multi-fiber warp threads (28) and multi-fiber weft threads (29) transverse to the multi-fiber warp threads (28), the base fabric (21) is manufactured on a loom, and each of the multi-fiber warp threads (28) and multi-fiber weft threads (29) comprises a bundle of multiple metal fibers (22') with a fiber thickness less than 50 microns, characterized in that the combustion membrane (14) further comprises multiple monofilament metal wires (25) with a monofilament thickness greater than 100 microns, and the monofilament metal wires (25) are directly inserted into the base fabric (21) by weaving on a loom to strengthen the combustion membrane (14).
2. The combustion membrane (14) according to claim 1, wherein, the bending strength of the monofilament metal wire (25) is greater than 50% or 75% or 100% of the bending strength of the multi-fiber warp threads (22) and multi-fiber weft threads (22) of the base fabric (21).
3. The combustion membrane (14) according to claim 1 or 2, wherein, the multi-fiber metal wires (22) helically extend around at least some of the monofilament wires (25), wherein the monofilament wires (25) and the multi-fiber wires are twisted together or the latter is wound around the former.
4. The combustion membrane (14) according to any one of the preceding claims, wherein, the monofilament metal wires (25) form a braid of monofilament warp threads (26) and monofilament weft threads (27) transverse to the monofilament warp threads (26).
5. The combustion membrane (14) according to any one of the preceding claims, wherein, the combustion membrane (14) is a single-layer structure, and the base fabric (21) and the braid of the monofilament wires (25) are combined by weaving on a loom.
6. The combustion membrane (14) according to any one of the preceding claims, wherein, the monofilament wires (25) each directly extend along and are adjacent to the corresponding multi-fiber warp threads (28) or multi-fiber weft threads (29) of the base fabric (21).
7. The combustion membrane (14) according to any one of the preceding claims, wherein, the monofilament wires (25) each precisely extend according to the weaving pattern of the multi-fiber warp threads (28) or multi-fiber weft threads (29) of the associated base fabric (21).
8. The combustion membrane (14) according to any one of the preceding claims, wherein, the monofilament warp threads (26) are positioned such that: At each warp pitch of the base fabric (21), or At multiple warp pitches of the base fabric (21), and Wherein the monofilament weft (27) is positioned such that: At each weft pitch of the base fabric (21), or At multiple weft pitches of the base fabric (2).
9. The combustion membrane (14) according to any one of claims 1 to 6, Wherein, The monofilament warp (26) is located at every other warp pitch of the base fabric (21), and the monofilament weft (27) is located at every other weft pitch of the base fabric (21).
10. The combustion membrane (14) according to any one of the preceding claims, Wherein, The monofilament thread (25) has a thickness or diameter extending transversely to its longitudinal direction, within the range of 100 microns to 250 microns, or 160 microns to 250 microns, or 200 microns.
11. The combustion membrane (14) according to any one of the preceding claims, Wherein, One or two fabric surfaces (19, 20) form high - raised ribs (23) and low - raised valleys (24), and the ribs (23) and the valleys (24) extend in at least one direction in the plane of the base fabric (21) by a distance greater than the space occupied by at least three consecutive multifilament warps (28) in the weft direction, and greater than the space occupied by at least three consecutive multifilament wefts (29) in the warp direction.
12. The combustion membrane (14) according to claim 11, Wherein, The ribs (23) and the valleys (24) together define a repeating pattern of a first row (33) and a second row (34), the first row (33) being inclined with respect to the weft and warp directions in a first direction, the second row (34) being inclined with respect to the weft and warp directions in a second direction transverse to the first direction, Wherein the first row (33) and the second row (34) intersect and define a diamond - shaped region (35), Wherein the two diagonals of the diamond - shaped region (35) are parallel to the weft and warp directions of the base fabric (21), Wherein each diamond - shaped region (35) is traversed by multiple monofilament warps (26) and multiple monofilament wefts (27).
13. A combustion membrane (14) for a gas burner (2), the combustion membrane (14) having an inner side (18) and an outer side (17), the inner side (18) to which the combustible gas (13) is supplied, and once the combustible gas (13) passes through the combustion membrane (14), the combustible gas (13) burns on the outer side (17), the combustion membrane (14) Comprises: A bottom mesh (121) having two opposite mesh surfaces (19, 20), the two opposite mesh surfaces (19, 20) forming a combustion surface (19) exposed on the outer side (17) and an inner surface (20) facing the inner side (18) respectively, wherein the bottom mesh (121) forms a braid of one or more multifilament wires (22), each multifilament wire (22) comprising a bundle of multiple metal fibers (22') with a fiber thickness less than 50 microns. Characterized in that, the combustion film (14) further comprises a plurality of monofilament metal wires (25) with a monofilament thickness greater than 100 microns, and the monofilament metal wires (25) are directly inserted into the bottom mesh (121) to reinforce the combustion film (14).