Combustion components, burners, heat exchange devices and water heaters

Abstract

The present invention proposes a combustion assembly, a burner, a heat exchange device including the burner, and a water heater using the heat exchange device. The combustion assembly includes: a connecting rod and multiple combustion columns, the combustion columns are provided with through holes for the connecting rod to pass through, and the connecting rod is connected in series with multiple combustion columns; a catalyst, and the catalyst is coated on the outer peripheral surface of the combustion column. The combustion assembly is composed of multiple combustion columns connected in series by a connecting rod, and there is a gap between two adjacent combustion columns, which provides space required for thermal expansion and greatly reduces the pressure and cracking of the combustion columns during thermal expansion. By using multiple independent combustion columns, even if one of the combustion columns cracks, the crack is only in the combustion column and will not affect the other combustion columns, thereby solving the problem of overall collapse of the combustion assembly and helping to increase the service life of the burner.

Description

Technical Field

[0001] The present invention relates to the field of gas equipment, in particular to a combustion assembly, a burner, a heat exchange device including the burner, and a water heater using the heat exchange device. Background Art

[0002] Catalytic combustion has begun to be used in gas water heaters due to its advantages, including sufficient oxidation, a thorough combustion reaction, and low CO and NOx levels in the exhaust gas after combustion. Currently used catalytic burners typically utilize porous ceramic foam coated with a catalyst. These foams have thin ribs, and after repeated combustion starts and stops, thermal stress caused by thermal expansion can easily reduce the thermal shock resistance of the foam, leading to fractures and even shattering, falling, and collapsing. Therefore, maintaining the structural stability of catalytic burners is of great significance to catalytic combustion technology and the water heater industry, and improvements are urgently needed. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a combustion assembly that is reliable and durable and effectively reduces fragmentation caused by thermal expansion.

[0004] The present invention also provides a burner comprising the combustion assembly.

[0005] The present invention also provides a heat exchange device comprising the above-mentioned burner.

[0006] The present invention also provides a water heater comprising the above heat exchange device.

[0007] According to the first embodiment of the present invention, the combustion assembly includes: a connecting rod and a plurality of combustion columns, wherein the combustion columns are provided with through holes for the connecting rod to pass through, and the connecting rod connects the plurality of combustion columns in series; and a catalyst, wherein the catalyst is coated on the outer peripheral surface of the combustion column.

[0008] According to the embodiment of the first aspect of the present invention, the combustion assembly has at least the following beneficial effects: the combustion assembly is composed of multiple combustion columns connected in series by a connecting rod, and there is a gap between two adjacent combustion columns, which provides the space required for thermal expansion and greatly reduces the pressure and cracking of the combustion columns during thermal expansion; multiple independent combustion columns are used, even if one of the combustion columns has a crack, the crack is only in the combustion column and will not affect other combustion columns, which solves the problem of overall collapse of the combustion assembly and is beneficial to improving the service life of the burner; the periphery of the multiple combustion columns forms a channel for airflow to pass through, which reduces the flow resistance and increases the area of ​​contact between the catalyst on the outer surface of the combustion column and the airflow, thereby improving the catalytic effect.

[0009] According to some embodiments of the first aspect of the present invention, the outer peripheral surface of the combustion column is provided with a concave-convex structure.

[0010] According to some embodiments of the first aspect of the present invention, the combustion column is cylindrical, and an annular notch is provided at one end of the combustion column, an annular groove is provided in the middle of the combustion column, a raised arc block is provided in the middle of the combustion column, or raised arc blocks are provided at both ends of the combustion column to form the concave-convex structure.

[0011] According to some embodiments of the first aspect of the present invention, the concave-convex structure is arranged along the circumference of the through hole.

[0012] According to some embodiments of the first aspect of the present invention, there are at least two types of combustion columns, and outer diameters of at least two types of the combustion columns are different.

[0013] According to some embodiments of the first aspect of the present invention, at least two of the combustion columns are arranged at intervals.

[0014] According to some embodiments of the first aspect of the present invention, limiting portions are provided at both ends of the connecting rod to define the combustion column.

[0015] According to some embodiments of the first aspect of the present invention, the limiting portion is a nut, and the nut is screwed to the end of the connecting rod.

[0016] A burner according to a second embodiment of the present invention includes: a plurality of combustion assemblies as described in the first embodiment, wherein the plurality of combustion assemblies are arranged in one or more layers, and the plurality of combustion assemblies in the same layer are arranged in parallel. The combustion assembly utilizes multiple independent combustion columns. Even if a crack develops in one of the combustion columns, the crack is limited to that combustion column and will not affect the other combustion columns. This solves the problem of the overall collapse or falling of the combustion assembly and helps to increase the service life of the burner.

[0017] According to some embodiments of the second aspect of the present invention, the plurality of combustion assemblies are divided into two layers, the upper and lower layers, and the connecting rods of the combustion assemblies in the upper layer are perpendicular to the connecting rods of the combustion assemblies in the lower layer.

[0018] According to the third aspect of the present invention, the heat exchange device includes: a first heat exchanger; a second heat exchanger connected to the lower end of the first heat exchanger; and the burner as described in the second aspect, the burner being located between the first heat exchanger and the second heat exchanger.

[0019] According to some embodiments of the third aspect of the present invention, a mounting cavity is provided at the lower end of the first heat exchanger and / or the upper end of the second heat exchanger, and the burner is arranged in the mounting cavity.

[0020] According to some embodiments of the third aspect of the present invention, a plurality of first water pipes are provided inside the second heat exchanger, and the plurality of first water pipes support the burner.

[0021] According to some embodiments of the third aspect of the present invention, the first heat exchanger is provided with fins abutting against the burner.

[0022] According to some embodiments of the third aspect of the present invention, the combustion assembly abutting the fin is perpendicular to the length direction of the fin.

[0023] According to some embodiments of the third aspect of the present invention, the second heat exchanger has a shell, an upper end of the shell is provided with an opening, and an interior of the opening forms the installation cavity.

[0024] According to some embodiments of the third aspect of the present invention, a second water pipe is connected to the inner wall of the shell, and the second water pipe is located in the opening.

[0025] The water heater according to the fourth embodiment of the present invention includes the heat exchange device as described in the third embodiment.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments with reference to the accompanying drawings, in which:

[0028] Figure 1 Schematic diagram of the structure of the combustion assembly of some embodiments of the first aspect of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the middle connecting rod;

[0030] Figure 3 Schematic diagram of the structure of the combustion column in the combustion assembly of some embodiments of the first aspect of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the combustion column in the combustion assembly of some embodiments of the first aspect of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the combustion column in the combustion assembly of some embodiments of the first aspect of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the combustion column in the combustion assembly of some embodiments of the first aspect of the present invention;

[0034] Figure 7 A schematic structural diagram of a burner in some embodiments of the second aspect of the present invention;

[0035] Figure 8 A front view of a burner according to some embodiments of the second aspect of the present invention;

[0036] Figure 9 A front view of a heat exchange device according to some embodiments of the third aspect of the present invention;

[0037] Figure 10 Schematic diagram of an exploded view of a heat exchange device according to some embodiments of the third aspect of the present invention;

[0038] Figure 11 A schematic structural diagram of the connection between the second heat exchanger and the burner in the heat exchange device of some embodiments of the third aspect of the present invention;

[0039] Figure 12 sectional views of heat exchange devices according to some embodiments of the third aspect of the present invention;

[0040] The accompanying figures are as follows:

[0041] Combustion assembly 100, connecting rod 110, limiting portion 111, combustion column 120, through hole 121, notch 122, groove 123, arc block 124;

[0042] Burner 200, preheating burner 210;

[0043] Heat exchange device 300 , first heat exchanger 310 , fins 311 , third water pipe 312 , exhaust pipe 313 , second heat exchanger 320 , first water pipe 321 , shell 322 , second water pipe 323 , air inlet 324 . DETAILED DESCRIPTION

[0044] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0045] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0048] The catalytic burners used in current gas water heaters are usually composed of porous foam ceramics coated with catalysts. The ribs of the porous foam ceramics are relatively thin. After experiencing multiple combustion start-up and stop processes, the thermal stress caused by thermal expansion can easily reduce the thermal shock resistance of the porous foam ceramics, causing the porous foam ceramics to break, and even cause the porous foam ceramics to shatter, fall, and collapse.

[0049] Reference Figure 1 According to some embodiments of the first aspect of the present invention, a combustion assembly 100 for a burner is proposed, comprising: a connecting rod 110 and a plurality of combustion columns 120, the combustion columns 120 being provided with a through hole 121 for the connecting rod 110 to pass through, the connecting rod 110 being passed through the through holes 121 of the plurality of combustion columns 120, connecting the plurality of combustion columns 120 in series as one, with a gap between two adjacent combustion columns 120, and the connecting rod 110 being a round rod, the combustion column 120 being able to rotate around the connecting rod 110, of course, the connecting rod 110 may also be a non-round rod, in which case the combustion column 120 is not rotatable; and the connecting rod 110 may be straight, then the combustion assembly 100 is in the shape of a long strip, which is convenient for assembly, and the connecting rod 110 may also be other curved shapes, adapted to the internal space of various gas water heaters; the outer peripheral surface of the combustion column 120 is coated with a catalyst. It can be understood that the operating environment temperature of the combustion assembly 100 is relatively high, and the connecting rod 110 is made of high-temperature resistant metal materials (such as iron, chromium, aluminum and other alloys); the combustion column 120 is made of ceramic materials such as alumina, silicon carbide, zirconium oxide, etc.; the catalyst carrier is modified alumina, the active components are platinum and palladium, and the additives are alumina and iron oxide. The catalyst and the adhesive are made into a slurry and then coated on the outer surface of the combustion column 120.

[0050] The catalyst can lower the ignition temperature of the gas and deepen its oxidation degree, so that the gas can burn flamelessly at a lower ignition temperature, reduce the harmful gases produced by the gas during ignition, and release heat radiation, thereby heating the heat exchanger. The gas and air can be enriched on the outer peripheral surface of the catalyst, increasing the reaction rate and improving the utilization rate of the fuel. The catalyst can effectively inhibit the production of nitrogen oxides, and at the same time make the catalytic combustion of the gas more complete, reduce the content of carbon monoxide in the flue gas, and thus effectively reduce the emission of harmful gases. Because it is flameless combustion, the combustion reaction is gentle and smooth, and the combustion noise is reduced. Catalytic combustion uses radiant heat. When the combustion stops, the burner 200 will continue to radiate heat outward. However, due to the small size of household gas water heaters and the limited space in the combustion chamber, even if the combustion stops, the heat radiation effect of the catalytic burner will still cause a large temperature rise in the water in the heat exchange flow path, which can better control the water temperature and keep the outlet water at the temperature required by the user.

[0051] The multiple combustion columns 120 connected in series on the connecting rod 110 have gaps between each other, providing space required for thermal expansion in the axial direction of the connecting rod 110, and the outer peripheral surfaces of the combustion columns 120 are independent spaces, and space required for thermal expansion is also provided in the radial direction of the connecting rod 110, which greatly reduces the compression and cracking of the combustion columns 120 during thermal expansion, which is beneficial to improving the service life of the combustion columns 120; the combustion assembly 100 adopts multiple independent combustion columns 120, even if one of the combustion columns 120 has a crack, the crack is only in the combustion column 120 and will not affect other combustion columns 120, preventing the crack from spreading to the entire combustion assembly 100, solving the problem of overall collapse and falling of the combustion assembly 100, improving the reliability of the combustion assembly 100, and helping to improve the service life of the burner 200; the outer peripheral surfaces of the combustion columns 120 and the gaps between them form an airflow channel, which reduces flow resistance and increases the area of ​​contact between the catalyst and the airflow on the outer peripheral surface of the combustion column 120, thereby improving the catalytic effect.

[0052] Combine Figure 1It is understandable that the outer circumference of the combustion column 120 is provided with a concave-convex structure. After multiple combustion columns 120 are connected in series by the connecting rod 110, the combustion assembly 100 has a curved outer surface, that is, the edge of the projection surface of the combustion assembly 100 is non-linear. After the combustion assembly 100 is installed in the strip groove or assembled, sufficient space is still reserved around the combustion assembly 100 for the passage of the mixed gas composed of gas and air, ensuring smooth airflow and sufficient combustion. The outer circumference of the combustion column 120 has a concave-convex structure, which increases the space for the combustion column 120 to expand radially, which helps to reduce the compression and cracking of the combustion column 120 due to thermal expansion. Even if multiple combustion assemblies 100 are closely arranged, there is still sufficient radial expansion space. The outer circumference of the combustion column 120 has a concave-convex structure, which increases the contact area between the mixed gas composed of gas and air and the combustion column 120, that is, the combustion assembly 100 has a larger catalytic contact area, thereby improving the catalytic combustion efficiency.

[0053] Reference Figure 1 and Figure 3 According to some embodiments of the first aspect of the present invention, the combustion column 120 is cylindrical, and an annular notch 122 is provided at one end of the combustion column 120. The outer peripheral surface of the combustion column 120 is stepped, and multiple combustion columns 120 are connected in series on the connecting rod 110. The notches 122 of the multiple combustion columns 120 are arranged at intervals, and the notches 122 are used to form an airflow channel, and the area of ​​contact between the combustion column 120 and the airflow is increased, so that the catalytic combustion effect is better. It can be understood that the notch 122 and the cylindrical outer peripheral surface of the combustion column 120 form a concave-convex structure, which is easy to form and low in cost. The cross-section of the notch 122 can be rectangular, elliptical, or irregular, such as the projection profile at the notch 122 is wavy. It should be understood that designing the combustion column 120 as two sections of cylinders with unequal outer diameters is more convenient for processing and production, and reduces costs. Since the notch 122 is located at one end of the combustion column 120, the arrangement of multiple combustion columns 120 can adopt a variety of schemes, such as Figure 1 As shown, multiple combustion columns 120 are arranged in the same direction, and multiple gaps 122 are arranged at equal intervals; it is also possible that the directions of two adjacent combustion columns 120 are opposite, or two combustion columns 120 are a group, and the directions of two adjacent groups are opposite, or even the directions of multiple combustion columns 120 can be selected at will.

[0054] Reference Figure 4It is understood that the concave-convex structure can also be an annular groove 123 provided in the middle of the combustion column 120. The cross-section of the groove 123 can be arcuate, rectangular, or other shapes. The groove 123 forms an airflow channel and increases the contact area between the combustion column 120 and the airflow, thereby improving the catalytic combustion effect. The two ends of the combustion column 120 can be the same size, and the combustion column 120 is non-directional. When multiple combustion columns 120 are connected in series, there is no need to select a direction. The two ends of the combustion column 120 can also be unequal in size, and the combustion column 120 is directional. Multiple combustion columns 120 can be arranged in the same direction or in an inverted arrangement.

[0055] Reference Figure 5 It is understood that the concave-convex structure can also be provided in the form of a raised arc-shaped block 124 in the middle of the combustion column 120. The arc-shaped block 124 can be annular along the circumference of the combustion column 120, or multiple arc-shaped blocks 124 can be arranged at intervals. The edges of the arc-shaped blocks 124 form an airflow channel, increasing the area of ​​contact between the combustion column 120 and the airflow, thereby improving the catalytic combustion effect. The two ends of the combustion column 120 can be the same size, and there is no need to select a direction when multiple combustion columns 120 are connected in series. The two ends of the combustion column 120 can also be different sizes. The combustion columns 120 have directionality, and multiple combustion columns 120 can be arranged in the same direction or with the intervals reversed.

[0056] Reference Figure 6 It is understood that the concave-convex structure can also be formed by providing raised arc-shaped blocks 124 at both ends of the combustion column 120 to form a concave-convex structure. Both ends of the arc-shaped blocks 124 can form airflow channels, and the area of ​​contact between the combustion column 120 and the airflow is increased, thereby improving the catalytic combustion effect. The arc-shaped blocks 124 at both ends of the combustion column 120 can be of equal outer diameter, and the combustion column 120 has no directionality, which facilitates the arrangement and assembly of multiple combustion columns 120; the arc-shaped blocks 124 at both ends of the combustion column 120 can also be of unequal outer diameter (gourd-shaped), and multiple combustion columns 120 can be arranged in the same direction or in an inverted arrangement.

[0057] Reference Figure 1 According to some embodiments of the first aspect of the present invention, the concave-convex structure is arranged along the circumference of the through hole, and the concave-convex structure is an annular notch 122 provided at one end of the combustion column 120. A plurality of combustion columns 120 connected in series on the connecting rod 110 can be arranged in the same direction, that is, the notches 122 of the combustion columns 120 are located on the same side, forming a plurality of air flow channels arranged at equal intervals on the combustion assembly 100, so that the gas flowing through the combustion assembly 100 is evenly distributed and the flow rate is stable, which helps to improve the stability of catalytic combustion. Of course, using Figure 4 、 Figure 5 or Figure 6The combustion column 120 shown can also form a plurality of air flow channels arranged at equal intervals, so that the gas flowing through the combustion assembly 100 is evenly distributed and has a stable flow rate, which helps to improve the stability of catalytic combustion.

[0058] It is understood that in order to form an airflow channel around the periphery of the combustion assembly 100, at least two types of combustion columns 120 can be designed, and the outer diameters of the various combustion columns 120 can be different. The multiple combustion columns 120 connected in series in the combustion assembly 100 have different outer diameters, and the outer contour of the combustion assembly 100 is non-linear, thereby forming an airflow channel around the periphery of the combustion assembly 100. The combustion columns 120 of various outer diameters can be arranged on the connecting rod 110 in various ways, including a regularly spaced arrangement or an irregular random arrangement.

[0059] It can be understood that the combustion assembly 100 uses two types of combustion columns 120, which are arranged in a staggered manner. Airflow channels are formed on the periphery of the combustion column 120 with a smaller outer diameter, and multiple airflow channels are arranged at intervals to ensure smooth airflow.

[0060] It is understandable that the two types of combustion columns 120 can be arranged in a variety of ways, such as two small outer diameter combustion columns 120 with one large outer diameter combustion column 120, two small outer diameter combustion columns 120 with two large outer diameter combustion columns 120, etc., all of which can form an airflow channel on the periphery of the combustion assembly 100.

[0061] It is understandable that the combustion assembly 100 can also adopt three types of combustion columns 120, four types of combustion columns 120, etc., according to actual usage requirements.

[0062] Reference Figure 1 According to some embodiments of the first aspect of the present invention, a limiting portion 111 is provided at both ends of the connecting rod 110, and multiple combustion columns 120 are confined between the two limiting portions 111 to prevent them from falling out. Considering that the combustion assembly 100 is used to assemble the burner 200, each combustion assembly 100 defines multiple combustion columns 120 through the limiting portions 111 at both ends, forming an integrated component for easy transportation and assembly. It is understandable that the two limiting portions 111 do not completely compress the multiple combustion columns 120, ensuring that a gap exists between two adjacent combustion columns 120 to allow the mixture of gas and air to circulate.

[0063] It is understandable that the limiting portions 111 may not be provided at both ends of the connecting rod 110. The combustion assembly 100 is installed in the gas water heater, and the two ends of the connecting rod 110 are fixed to other components or abut other components, which can also limit multiple combustion columns 120.

[0064] According to some embodiments of the first aspect of the present invention, the retaining portion 111 is a nut. Both ends of the connecting rod 110 are provided with external threads that mate with the nut, and the nut is mounted on each end of the connecting rod 110. The nut offers the advantage of easy assembly and disassembly, facilitating assembly of the combustion assembly 100 and adjusting the tightness of the multiple combustion columns 120. Furthermore, when the combustion assembly 100 is installed in the gas water heater, the nut can be used to secure the combustion assembly 100 with other components, further facilitating assembly.

[0065] It is understandable that the limiting portion 111 at one end of the connecting rod 110 may be a nut, and the limiting portion 111 at the other end may be a protrusion; or, the limiting portion 111 may be a hemispherical block welded to both ends of the connecting rod 110; or, the two ends of the connecting rod 110 may be bent to form the limiting portion 111, both of which can achieve the purpose of limiting multiple combustion columns 120.

[0066] Reference Figure 7 The burner 200 according to the embodiment of the second aspect of the present invention comprises a plurality of combustion assemblies 100 according to the embodiment of the first aspect, wherein the plurality of combustion assemblies 100 are arranged in one layer or multiple layers, and the plurality of combustion assemblies 100 in the same layer are arranged in parallel. It should be understood that the arrangement of the plurality of combustion assemblies 100 in one layer or multiple layers means that the burner 200 has a hierarchical structure, and this hierarchical structure can be flat or curved, and the hierarchical distribution can be clearly seen in the structure. An air flow channel is formed between two adjacent combustion assemblies 100 by the gaps around the combustion columns 120, through which a mixture of fuel gas and air can pass. Under the action of a catalyst, the mixed gas undergoes flameless combustion on the outer peripheral surface of the combustion column 120. The combustion assembly 100 uses a plurality of independent combustion columns 120. Even if a crack appears in one of the combustion columns 120, the crack is only in the combustion column 120 and will not affect the other combustion columns 120. This solves the problem of the overall collapse or falling of the combustion assembly 100 and improves the service life of the burner 200.

[0067] Reference Figure 7 and Figure 8According to some embodiments of the second aspect of the present invention, the burner 200 is divided into two layers, the upper and lower layers, and the connecting rod 110 of the combustion assembly 100 of the upper layer is perpendicular to the connecting rod 110 of the combustion assembly 100 of the lower layer. The directions of the combustion assemblies 100 of the upper and lower layers are perpendicular to each other, and the mixed gas has a turning path when flowing through the burner 200, which can increase the contact time between the mixed gas and the combustion column 120, which is beneficial to improving the utilization rate of the gas and making the catalytic combustion of the gas more complete. The combustion assemblies 100 of the upper and lower layers of the burners 200 are perpendicular to each other, and the combustion assembly 100 of the lower layer plays the role of supporting the combustion assembly 100 of the upper layer, and the contact area between the combustion assembly 100 of the lower layer and the combustion assembly 100 of the upper layer is small, so the contact area between the combustion assembly 100 and the gas is relatively large, which is beneficial to improving the effect of catalytic combustion. Taking into account that the outer peripheral surface of the combustion column 120 is provided with a concave-convex structure, the combustion assemblies 100 of the upper and lower layers of burners 200 are perpendicular to each other. The concave-convex structure of the combustion column 120 can be used to clamp each other to achieve positioning and prevent sliding and displacement between the upper and lower layers of burners 200.

[0068] It can be understood that the burner 200 consists of two layers, and the combustion assemblies 100 of the upper and lower layers of burners 200 are arranged in parallel. Each combustion assembly 100 in the upper layer is arranged above the gap between two adjacent combustion assemblies 100 in the lower layer. The combustion assembly 100 in the lower layer serves to support the combustion assembly 100 in the upper layer. After the mixture of gas and air passes through the air flow channel of the lower layer combustion assembly 100, it is blocked by the upper layer combustion assembly 100, and the flow rate is reduced, which is conducive to sufficient catalytic combustion of the mixed gas and improves the utilization rate.

[0069] It is understood that the burner 200 can also adopt a multi-layer structure such as three or four layers. The burner 200 has more combustion columns 120, and the contact area between the combustion columns 120 and the gas is larger, which improves the catalytic combustion effect. The number of layers of the burner 200 can be selected according to the use requirements and the installation space of the gas water heater.

[0070] Reference Figure 9 and Figure 10The heat exchange device 300 according to the third embodiment of the present invention includes: a first heat exchanger 310, a second heat exchanger 320 and a burner 200. The second heat exchanger 320 is connected to the lower end of the first heat exchanger 310, and the burner 200 is located between the first heat exchanger 310 and the second heat exchanger 320. A preheating burner 210 is arranged at the lower part of the second heat exchanger 320. The preheating burner 210 is used to heat the burner 200. When the burner 200 reaches a sufficient temperature, the gas is transferred to the surface of the burner 200 for combustion. An air inlet 324 is provided at the lower end of the second heat exchanger 320. There is a mixing chamber in the air inlet 324 and the preheating burner 210. The gas and air are mixed in the mixing chamber. An exhaust pipe 313 is provided at the upper end of the first heat exchanger 310 to discharge the exhaust gas generated by combustion. It is understood that the first heat exchanger 310 and the second heat exchanger 320 have two functions. The first function is heat exchange. The first heat exchanger 310 and the second heat exchanger 320 have water pipes inside. The heat released by combustion is transferred to the water in the water pipes to produce hot water. The second function is to install the burner 200. The first heat exchanger 310 and the second heat exchanger 320 are sealed together. The burner 200 can be installed separately in the first heat exchanger 310 or the second heat exchanger 320, or the burner 200 can be connected to the first heat exchanger 310 and the second heat exchanger 320 at the same time. Because the burner 200 is flameless and radiates heat in all directions, the first heat exchanger 310 and the second heat exchanger 320 sandwich the burner 200 from the top and bottom, which helps to improve heat utilization and reduce energy consumption.

[0071] Reference Figure 9 and Figure 10 According to some embodiments of the third aspect of the present invention, an installation cavity is provided at the upper end of the second heat exchanger 320, and the burner 200 is installed in the installation cavity, while the first heat exchanger 310 is connected to the upper end of the second heat exchanger 320, and the burner 200 is limited by the first heat exchanger 310.

[0072] It is understandable that the installation cavity may also be arranged at the lower end of the first heat exchanger 310 , and the burner 200 is embedded in the installation cavity, supported by the second heat exchanger 320 and defining the burner 200 .

[0073] It can be understood that the installation cavity is at the connection between the first heat exchanger 310 and the second heat exchanger 320 , and the first heat exchanger 310 and the second heat exchanger 320 cooperate to clamp the burner 200 , thereby fixing the burner 200 .

[0074] Reference Figure 10 and Figure 12According to some embodiments of the third aspect of the present invention, a plurality of parallel first water pipes 321 are provided inside the second heat exchanger 320. The first water pipes 321 traverse the inner cavity of the second heat exchanger 320. The plurality of first water pipes 321 are arranged at intervals, and the plurality of first water pipes 321 support the burner 200. The plurality of first water pipes 321 are used as the support structure of the burner 200, which simplifies the structure of the second heat exchanger 320. Moreover, the plurality of first water pipes 321 are in contact with the burner 200, making heat exchange more direct and rapid, thereby improving heat exchange efficiency. Figure 12 Four first water pipes 321 can be used, two of which are arranged at both ends of the burner 200, and two first water pipes 321 are arranged in the middle of the burner 200, which balances the supporting force and reduces obstruction to the airflow.

[0075] Reference Figure 12 According to some embodiments of the third aspect of the present invention, the lower end of the first heat exchanger 310 is provided with fins 311 that abut against the burner 200. The fins 311 cooperate with the first water pipe 321 to clamp the burner 200, limit the position of the burner 200, and prevent the burner 200 from shaking or making noise during use. It is understood that a third water pipe 312 is provided inside the first heat exchanger 310, parallel to the first water pipe 321. The third water pipe 312 is inserted through the fins 311. The fins 311 support and position the third water pipe 312, improving structural strength. The fins 311 can improve the heat exchange efficiency of the third water pipe 312 and increase the utilization rate of heat.

[0076] Reference Figure 12 As will be appreciated, the third water pipe 312 is typically provided with multiple fins 311. The upper combustion assembly 100 of the burner 200 contacts the fins 311 and is perpendicular to the length of the fins 311. This abutment of the upper combustion assembly 100 of the burner 200 against the multiple fins 311 creates a more stable structure. Furthermore, the heat generated by the burner 200 can be transferred more quickly and efficiently to the fins 311 and the third water pipe 312, thereby improving heat exchange efficiency.

[0077] Reference Figure 11According to some embodiments of the third aspect of the present invention, the second heat exchanger 320 has a shell 322, and an opening is provided at the upper end of the shell 322. The burner 200 is arranged in the opening, and the shell 322 is used to limit the four sides of the burner 200 to prevent the burner 200 from shifting; usually, the opening of the shell 322 is rectangular, and the shape of the burner 200 matches the shape of the opening. During assembly, the burner 200 is installed in the opening of the shell 322. Due to the action of gravity, the burner 200 falls directly to contact the first water pipe 321, and the positioning is accurate, which is convenient for assembly. The burner 200 is flush with the upper end surface of the shell 322, and the burner 200 abuts the first heat exchanger 310 for positioning, making the assembly of the second heat exchanger 320 and the first heat exchanger 310 more convenient; the upper end surface of the shell 322 is provided with a folded edge, and the folded edge is provided with a circular hole for bolt installation. The first heat exchanger 310 and the shell 322 are fixed by bolt connection, and the folded edge also supports the first heat exchanger 310 to prevent the first heat exchanger 310 from exerting pressure on the burner 200.

[0078] Reference Figure 12 According to some embodiments of the third aspect of the present invention, the inner wall of the shell 322 is connected to a second water pipe 323, and the second water pipe 323 is located at the opening of the shell 322. The second water pipe 323 is close to the burner 200. On the one hand, the second water pipe 323 contacts the side of the burner 200, and the water in the second water pipe 323 absorbs the heat radiated from the side of the burner 200, thereby improving the utilization rate of heat; on the other hand, the second water pipe 323 serves as an intermediate layer between the shell 322 and the burner 200, reducing the heat of the shell 322; and the second water pipe 323 plays a role in circumferentially limiting the burner 200, preventing the burner 200 from shifting horizontally. It can be understood that the second water pipe 323 can be annular and surround the burner 200, or the second water pipe 323 can be two parallel arranged ones, with each end of the burner 200 abutting against a second water pipe 323.

[0079] The water heater according to the fourth embodiment of the present invention (not shown in the figure) includes the heat exchange device 300 of the third embodiment and has all the beneficial effects of the heat exchange device 300, which will not be described in detail.

[0080] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the spirit of the present invention.

Claims

1. A burner, characterized in that include: Multiple combustion assemblies, wherein the multiple combustion assemblies are arranged in one layer or multiple layers, and the multiple combustion assemblies in the same layer are arranged in parallel, and the combustion assemblies include: Connecting rod; a plurality of combustion columns, each of which is provided with a through hole for the connecting rod to pass through; the connecting rod is connected in series with the plurality of combustion columns; both ends of the connecting rod are provided with limiting portions to limit the combustion columns; a gap is provided between two adjacent combustion columns to provide space required for thermal expansion in the axial direction of the connecting rod; the outer circumferential surface of the combustion column and the gap form an airflow channel; the outer circumferential surface of the combustion column is provided with a concave-convex structure, and the concave-convex structure is arranged along the circumference of the through hole; the combustion column is cylindrical, and one end of the combustion column is provided with an annular notch; the outer circumferential surface of the combustion column is stepped to form the airflow channel by utilizing the notch; Alternatively, an annular groove is provided in the middle of the combustion column, so as to form the air flow channel by utilizing the groove; Alternatively, a raised arc-shaped block is provided in the middle of the combustion column, so that the air flow channel is formed by utilizing the edge of the arc-shaped block; Alternatively, both ends of the combustion column are provided with raised arc-shaped blocks to form the concave-convex structure, and both ends of the arc-shaped blocks form the airflow channel; a catalyst coated on the outer peripheral surface of the combustion column; The air flow channel for the mixed gas of fuel gas and air to pass through is formed by the gaps around the combustion column between two adjacent combustion assemblies.

2. The burner according to claim 1, characterized in that There are at least two types of combustion columns, and the outer diameters of at least two of the combustion columns are different.

3. The burner according to claim 2, characterized in that At least two of the combustion columns are arranged at intervals.

4. The burner according to claim 1, characterized in that The limiting portion is a nut, and the nut is screwed to the end of the connecting rod.

5. The burner according to any one of claims 1 to 4, characterized in that The plurality of combustion assemblies are divided into two layers, an upper layer and an lower layer, and the connecting rods of the combustion assemblies in the upper layer and the connecting rods of the combustion assemblies in the lower layer are perpendicular to each other.

6. A heat exchange device, characterized in that: include: a first heat exchanger; a second heat exchanger connected to the lower end of the first heat exchanger; The burner according to any one of claims 1 to 5, wherein the burner is located between the first heat exchanger and the second heat exchanger.

7. The heat exchange device according to claim 6, characterized in that: The lower end of the first heat exchanger and / or the upper end of the second heat exchanger is provided with an installation cavity, and the burner is arranged in the installation cavity.

8. The heat exchange device according to claim 7, characterized in that: A plurality of first water pipes are provided inside the second heat exchanger, and the plurality of first water pipes support the burner.

9. The heat exchange device according to claim 8, characterized in that: The first heat exchanger is provided with fins that abut against the burner.

10. The heat exchange device according to claim 9, characterized in that: The combustion assembly abutting against the fin is perpendicular to the length direction of the fin.

11. The heat exchange device according to claim 7, characterized in that: The second heat exchanger has a shell, an upper end of the shell is provided with an opening, and the interior of the opening forms the installation cavity.

12. The heat exchange device according to claim 11, characterized in that: The inner wall of the shell is connected with a second water pipe, and the second water pipe is located in the opening.

13. A water heater, characterized in that The heat exchange device comprises the heat exchange device according to any one of claims 6 to 12.

Images