Air-cooled combustion chamber

Abstract

The utility model discloses an air-cooled combustion chamber which comprises an inner frame body and an outer frame body, and the interior of the inner frame body is enclosed to form a combustion cavity; the outer frame body is arranged outside the inner frame body in a surrounding mode, a first profiling area is arranged on the outer frame body, the first profiling area is of a plane structure, and an air cooling channel is defined between the interior of the first profiling area and the outer wall of the inner frame body. Wherein the first profiling area is provided with a second profiling area at least located in the middle area of the first profiling area, and the second profiling area is a structural rib and penetrates through the first profiling area. Therefore, the second profiling area is arranged on the first profiling area of the outer frame body, and the second profiling area is a penetrating structural rib and can divide the plane structure of the first profiling area into at least two areas, so that when vibration generated by combustion is transmitted to the surface of the first profiling area, the generated vibration can be dispersed to the center of each sub-area; the vibration of the surface of the combustion chamber is reduced, the service life of the combustion chamber is prolonged, and meanwhile mechanical noise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, specifically to an air-cooled combustion chamber. Background Technology

[0002] This section provides only background information related to this application to enable those skilled in the art to understand this application more thoroughly and accurately, and it is not necessarily prior art.

[0003] A gas water heater is a gas appliance that uses gas as fuel and heats water by transferring heat to cold water flowing through a heat exchanger. Currently, gas water heaters are generally classified into two types: forced-draft gas water heaters and forced-blowing gas water heaters.

[0004] In the case of forced-draft gas water heaters, for models with compact structure and small size, the combustion chamber of the gas water heater usually adopts a coilless air-cooled combustion chamber structure. This type of combustion chamber adds a sheet metal partition to the inner cavity of the combustion chamber, which separates a layer of air-cooled air chamber. The operation of the fan draws external air into the burner and drives the air in the combustion chamber to flow. The flowing air carries away the heat from the side wall of the combustion chamber, thereby reducing the surface temperature of the combustion chamber.

[0005] However, because the surface of a traditional combustion chamber is a large flat plane, its structural strength is low. Under the excitation of combustion vibration, it is very easy to cause structural resonance of the combustion chamber wall. This not only leads to stress concentration and fatigue failure of the combustion chamber wall, thus shortening the service life of the combustion chamber, but also generates greater mechanical noise, reducing the user experience. Utility Model Content

[0006] To overcome the deficiencies of the prior art, this utility model provides an air-cooled combustion chamber. By setting a second molding zone on the first molding zone of the outer frame, the second molding zone is a through structural rib that can divide the planar structure of the first molding zone into at least two regions. When the vibration generated by combustion is transmitted to the surface of the first molding zone, the vibration can be dispersed to the center of each sub-region, which not only reduces the vibration of the combustion chamber surface and improves the service life of the combustion chamber, but also reduces the generation of mechanical noise.

[0007] The technical solution adopted by this utility model to solve its problem is:

[0008] An air-cooled combustion chamber, comprising:

[0009] The inner frame encloses and forms a combustion chamber.

[0010] An outer frame surrounds the outer frame; the outer frame has a first molding area, which is a planar structure and its interior is enclosed with the outer wall of the inner frame to form a cooling channel.

[0011] The first forming area is provided with a second forming area located at least in its middle region. The second forming area is a structural reinforcement and is provided through the first forming area.

[0012] Furthermore, the first molding area is a rectangular boss formed on the surface of the outer frame, and the second molding area is a rib formed on the surface of the rectangular boss, the rib extending through the rectangular boss along its width direction.

[0013] Furthermore, multiple ribs are provided, and the multiple ribs are evenly spaced along the length direction of the rectangular boss.

[0014] Furthermore, the depth of the first molding zone is h1, and the depth of the second molding zone is h2, and both satisfy 3mm≤h1≤8mm and 2mm≤h2≤4mm.

[0015] Furthermore, the upper part of the outer frame is provided with an air inlet that connects to the air-cooling channel, and the lower part of the inner frame is provided with an air outlet that connects the air-cooling channel and the combustion chamber respectively, so that a cooling airflow from top to bottom is formed in the air-cooling channel.

[0016] Furthermore, the height of the air outlet from the bottom of the outer frame is h3, and satisfies 15mm≤h3≤30mm.

[0017] Furthermore, the depth of the air-cooling channel is h4, and satisfies 3mm≤h4≤8mm.

[0018] Furthermore, the inner frame is made of aluminum silicate board, and the outer frame is made of sheet metal.

[0019] Further, the inner frame includes an inner frame and inner frame side panels, and the outer frame includes an outer frame and outer frame side panels, wherein:

[0020] Both the inner frame and the outer frame are U-shaped structures. The inner frame is embedded inside the outer frame and the two are connected by screws to form the frame body. The inner frame side plate is embedded inside the outer frame side plate and the two are connected by screws to form the side plate body.

[0021] The main frame body and the main side plate body are connected by screws to form the outer frame and the inner frame, both of which are rectangular structures with openings at the top and bottom.

[0022] Furthermore, the edge of the outer frame is provided with a first limiting bend for limiting the inner frame, and the edge of the outer frame side plate is provided with a second limiting bend for limiting the inner frame side plate.

[0023] In summary, the air-cooled combustion chamber provided by this utility model has the following beneficial effects:

[0024] (1) By setting a second molding area on the first molding area of ​​the outer frame, the second molding area is a through structural rib and it can divide the planar structure of the first molding area into at least two regions. When the vibration generated by combustion is transmitted to the surface of the first molding area, the vibration generated can be dispersed to the center of each region, which not only reduces the vibration of the combustion chamber surface and improves the service life of the combustion chamber, but also reduces the generation of mechanical noise.

[0025] (2) By forming a cooling airflow from top to bottom in the air-cooling channel, since the flame temperature rises along the flame diffusion direction, that is, the temperature at the tail end of the flame is greater than the temperature at the root of the flame, the cooling airflow from top to bottom can better reduce the temperature of the upper part of the combustion chamber. At the same time, the inner frame is made of aluminum silicate plate, which can better insulate the heat, thereby achieving the purpose of reducing the surface temperature of the combustion chamber.

[0026] (3) The distance between the air outlet on the inner frame and the bottom of the outer frame is a certain height, which not only allows the air in the air-cooling channel to enter the combustion chamber to participate in secondary combustion, but also does not affect the temperature at the root of the flame, thus avoiding flame instability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the air-cooled combustion chamber of this utility model;

[0028] Figure 2 This is an exploded schematic diagram of the air-cooled combustion chamber of this utility model;

[0029] Figure 3 This is a schematic diagram of the outer frame of the air-cooled combustion chamber of this utility model;

[0030] Figure 4 This is a side view of the outer frame of the air-cooled combustion chamber of this utility model;

[0031] Figure 5 for Figure 4 Enlarged diagram of section A in the middle;

[0032] Figure 6 This is a cross-sectional schematic diagram of the air-cooled combustion chamber of this utility model;

[0033] Figure 7 This is another cross-sectional schematic diagram of the air-cooled combustion chamber of this utility model.

[0034] The meanings of the reference numerals in the attached figures are as follows:

[0035] 1. Outer frame; 11. Outer frame; 111. First rectangular boss; 112. First rib; 1121. First air inlet; 1122. Second air inlet; 113. First limiting bend; 12. Outer frame side panel; 121. Second rectangular boss; 122. Second rib; 1221. Third air inlet; 123. Second limiting bend; 2. Inner frame; 21. Inner frame; 211. First air outlet; 22. Inner frame side panel; 221. Second air outlet; 3. First screw; 4. Second screw; 5. Air cooling channel. Detailed Implementation

[0036] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0039] See Figure 1-7 This invention provides an air-cooled combustion chamber, including an inner frame 2 and an outer frame 1. The inner frame 2 encloses a combustion chamber, and the outer frame 1 surrounds the inner frame 2. The outer frame 1 has a first molding area on its surface, which is planar and forms an air-cooling channel 5 between its interior and the outer wall of the inner frame 2. The outer frame 1 has an air inlet connecting to the air-cooling channel 5, and the inner frame 2 has air outlets connecting to both the air-cooling channel and the combustion chamber. Therefore, when the burner fan is started, it draws in outside air, which flows into the air-cooling channel 5 through the air inlet, thus removing heat from the combustion chamber surface and reducing its temperature. Furthermore, when air is blown out through the air outlet and enters the combustion chamber, it participates in secondary combustion, resulting in more complete combustion.

[0040] Specifically, the outer frame 1 includes an outer frame 11 and an outer frame side panel 12 that are spliced ​​together, and the inner frame 2 includes an inner frame 21 and an inner frame side panel 22 that are spliced ​​together; wherein, the inner frame 21 and the outer frame 11 are both U-shaped structures and each includes a front panel, a back panel and a side panel that connects the front panel and the back panel respectively, and the edges of the outer frame 11 are bent to form a plurality of first limiting bends 113; the inner frame side panel 22 and the outer frame side panel 12 are both flat structures, and the two sides of the outer frame side panel 12 are bent to form two second limiting bends 123. Therefore, when assembling the air-cooled combustion chamber, one end of the inner frame 21 is first inserted into the outer frame 11 and limited by several first limiting bends 113. Then, the inner frame 21 and the outer frame 11 are connected by several second screws 4 to form the frame body. Next, one end of the inner frame side plate 22 is inserted into the outer frame side plate 12 and limited by several second limiting bends 123. Then, the inner frame side plate 22 and the outer frame side plate 12 are connected by several second screws 4 to form the side plate body. Finally, the frame body and the side plate body are connected by several first screws 3 to form the outer frame 1 and the inner frame 2, thus completing the assembly of the air-cooled combustion chamber. Both the outer frame 1 and the inner frame 2 are rectangular structures with openings at the top and bottom.

[0041] More specifically, the first molding area is a first rectangular boss 111 formed on the outer surface of the front plate, back plate and one side plate of the outer frame 11 and a second rectangular boss 121 formed on the outer surface of the outer frame side plate 12. The first rectangular boss 111 has a groove inside to form a cooling channel 5 between it and the outer wall of the inner frame 21, and the second rectangular boss 121 has a groove inside to form a cooling channel 5 between it and the outer wall of the inner frame side plate 22.

[0042] It should be noted that, since the first molding zone is a planar structure, its structural strength is relatively low, and it is easily subjected to structural vibration of the wall surface under the excitation of combustion vibration. Therefore, this application also provides a second molding zone on the first molding zone. The second molding zone is a structural rib and is located at least in the middle region of the first molding zone and penetrates through the first molding zone.

[0043] See also Figure 1-3Specifically, the second molding area includes a first rib 112 formed on the first rectangular boss 111, the first rib 112 extending through the width of the first rectangular boss 111; wherein, multiple first ribs 112 are provided, and the multiple first ribs 112 are evenly spaced along the length of the first rectangular boss 111 to divide the first rectangular boss 111 into multiple equally divided regions to improve the central weakness of the large planar structure of the first rectangular boss 111; the second molding area also includes a second rib 122 formed on the second rectangular boss 121, the second rib 122 extending through the width of the second rectangular boss 121; wherein, multiple second ribs 122 are provided, and the multiple second ribs 122 are evenly spaced along the length of the second rectangular boss 121 to divide the second rectangular boss 121 into multiple equally divided regions to improve the central weakness of the large planar structure of the second rectangular boss 121.

[0044] Therefore, by providing a second molding zone at least in the center region and extending through the first molding zone of the outer frame 1, the second molding zone is a through structural rib that can divide the large planar structure of the first molding zone into multiple equal regions. This can disperse the vibration generated by the large planar structure to the center of each sub-region, thereby improving the problems of weak central region of the first molding zone or weak non-through molding ribs, thus reducing the vibration of the combustion chamber surface, which not only improves the service life of the combustion chamber, but also reduces the generation of mechanical noise.

[0045] In this embodiment, three first ribs 112 are provided to divide the first rectangular boss 111 into four equal regions, and three second ribs 122 are provided to divide the second rectangular boss 121 into four equal regions. The number of first ribs 112 and second ribs 122 can be adjusted according to the length of the first rectangular boss 111 and the second rectangular boss 121, and there is no limit to the number here.

[0046] In this embodiment, the depth of the first molding area is h1, the depth of the second molding area is h2, and the conditions are 3mm≤h1≤8mm and 2mm≤h2≤4mm.

[0047] See also Figure 1-2 as well as Figure 6-7The upper part of the outer frame 1 is provided with an air inlet that connects to the air-cooling channel 5, and the lower part of the inner frame is provided with an air outlet that connects to the air-cooling channel 5 and the combustion chamber respectively, so that a cooling airflow from top to bottom is formed in the air-cooling channel 5. Specifically, the air inlet includes several first air inlets 1121 on the front and back plates of the outer frame 11, several second air inlets 1122 on the side plates of the outer frame 11, and several third air inlets 1221 on the side plates of the outer frame 12. The first air inlets 1121 and the second air inlets 1122 are all located on the first rib 112 at the top of their plane, and the height of the first air inlets 1121 is higher than that of the second air inlets 1122. The third air inlets 1221 are all located on the second rib 122 at the top of their plane, and the height of the third air inlets 1221 is the same as that of the second air inlets 1122. The air outlet includes several first air outlets 211 on the front, back, and side plates of the inner frame 21, and several second air outlets 221 on the side plates of the inner frame 22. The first air outlets 211 and the second air outlets 221 are all located at the same height.

[0048] Therefore, when the burner fan is working, external air can enter the air-cooling channel 5 through several first air inlets 1121 and be blown out through several first air outlets 211 to form a cooling effect. Figure 6 The airflow is shown in direction a; simultaneously, external air can also enter the air-cooling channel 5 through several second air inlets 1122 and be blown out through several first air outlets 211 to form an airflow pattern as shown in the diagram. Figure 7 The airflow is shown in direction b; simultaneously, external air can also enter the air-cooling channel 5 through several third air inlets 1221 and be blown out through several second air outlets 221 to form a flow pattern as shown in the figure. Figure 7 The airflow in direction b is shown.

[0049] Therefore, by forming a cooling airflow flowing from top to bottom in the air-cooling channel 5, since the flame temperature rises along the flame diffusion direction, that is, the temperature at the tail end of the flame is greater than the temperature at the root of the flame, the cooling airflow flowing from top to bottom can better reduce the temperature of the upper part of the combustion chamber; at the same time, since the inner frame 2 is made of aluminum silicate plate, it can provide better heat insulation, thereby achieving the purpose of reducing the surface temperature of the combustion chamber.

[0050] In this embodiment, the outer frame 1 is a sheet metal part.

[0051] In this embodiment, the depth of the air-cooling channel 5 is h4, and it satisfies 3mm≤h4≤8mm.

[0052] Furthermore, both the first air outlet 211 and the second air outlet 221 are positioned at a height of h3 from the bottom of the outer frame 1, satisfying 15mm ≤ h3 ≤ 30mm. This configuration not only allows the air in the air-cooling channel 5 to enter the combustion chamber for secondary combustion but also does not affect the temperature at the flame root, thus preventing flame instability.

[0053] In summary, the air-cooled combustion chamber provided by this utility model has the following beneficial effects:

[0054] (i) By setting a second molding area on the first molding area of ​​the outer frame 1, the second molding area is a through structural rib and can divide the planar structure of the first molding area into at least two regions. When the vibration generated by combustion is transmitted to the surface of the first molding area, the vibration generated can be dispersed to the center of the divided region, which not only reduces the vibration of the combustion chamber surface and improves the service life of the combustion chamber, but also reduces the generation of mechanical noise.

[0055] (ii) By forming a cooling airflow from top to bottom in the air-cooling channel 5, since the flame temperature rises along the flame diffusion direction, that is, the temperature at the tail end of the flame is greater than the temperature at the root of the flame, the cooling airflow from top to bottom can better reduce the temperature of the upper part of the combustion chamber. At the same time, the inner frame 2 is made of aluminum silicate plate, which can better insulate the heat, thereby achieving the purpose of reducing the surface temperature of the combustion chamber.

[0056] (iii) The distance between the air outlet on the inner frame 2 and the bottom of the outer frame 1 is a certain height, which not only allows the air in the air-cooling channel 5 to enter the combustion chamber to participate in secondary combustion, but also does not affect the temperature at the root of the flame, thus avoiding flame instability.

[0057] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0058] It should be understood that the terms "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] Furthermore, in the description of this utility model, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0060] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An air-cooled combustion chamber, characterized in that, include: The inner frame encloses and forms a combustion chamber. An outer frame surrounds the outer frame; the outer frame has a first molding area, which is a planar structure and its interior is enclosed with the outer wall of the inner frame to form a cooling channel. The first forming area is provided with a second forming area located at least in its middle region. The second forming area is a structural reinforcement and is provided through the first forming area.

2. The air-cooled combustion chamber according to claim 1, characterized in that, The first molding area is a rectangular boss formed on the surface of the outer frame, and the second molding area is a rib formed on the surface of the rectangular boss, the rib extending through the rectangular boss along its width direction.

3. The air-cooled combustion chamber according to claim 2, characterized in that, The ribs are provided in multiple ways, and the multiple ribs are evenly spaced along the length direction of the rectangular boss.

4. The air-cooled combustion chamber according to claim 1, characterized in that, The depth of the first molding zone is h1, and the depth of the second molding zone is h2, and both satisfy 3mm≤h1≤8mm and 2mm≤h2≤4mm.

5. The air-cooled combustion chamber according to any one of claims 1-4, characterized in that, The upper part of the outer frame is provided with an air inlet that connects to the air-cooling channel, and the lower part of the inner frame is provided with an air outlet that connects the air-cooling channel and the combustion chamber respectively, so that a cooling airflow from top to bottom is formed in the air-cooling channel.

6. The air-cooled combustion chamber according to claim 5, characterized in that, The height of the air outlet from the bottom of the outer frame is h3, and satisfies 15mm≤h3≤30mm.

7. The air-cooled combustion chamber according to claim 5, characterized in that, The depth of the air-cooling channel is h4, and it satisfies 3mm≤h4≤8mm.

8. The air-cooled combustion chamber according to any one of claims 1-4, characterized in that, The inner frame is made of aluminum silicate board, and the outer frame is made of sheet metal.

9. The air-cooled combustion chamber according to any one of claims 1-4, characterized in that, The inner frame includes an inner frame and inner frame side panels, and the outer frame includes an outer frame and outer frame side panels, wherein: Both the inner frame and the outer frame are U-shaped structures. The inner frame is embedded inside the outer frame and the two are connected by screws to form the frame body. The inner frame side plate is embedded inside the outer frame side plate and the two are connected by screws to form the side plate body. The main frame body and the main side plate body are connected by screws to form the outer frame and the inner frame, both of which are rectangular structures with openings at the top and bottom.

10. The air-cooled combustion chamber according to claim 9, characterized in that, The outer frame has a first limiting bend at its edge to limit the inner frame, and the outer frame side plate has a second limiting bend at its edge to limit the inner frame side plate.

Images