Combustion heat exchange assembly

Abstract

The utility model belongs to the technical field of combustion, and particularly discloses a combustion heat exchange assembly. The combustion heat exchange assembly comprises a combustion chamber assembly, a heat exchanger and an exhaust fume collecting hood. The combustion chamber assembly is provided with a vertically-through combustion cavity, the front side and the rear side of the combustion chamber assembly are higher than the left side and the right side of the combustion chamber assembly, and insertion positioning parts are arranged at the upper ends of the front side and the rear side of the combustion chamber assembly and comprise longitudinal positioning parts extending upwards and transverse positioning parts connected to the outer sides of the lower ends of the longitudinal positioning parts. The heat exchanger is erected at the upper ends of the left and right sides of the combustion chamber assembly and located between the front and rear sides of the combustion chamber assembly. The left side and the right side of the exhaust fume collecting hood are inserted between the left side end plate and the right side end plate of the heat exchanger correspondingly, and the lower ends of the front side and the rear side of the exhaust fume collecting hood are located on the outer sides of the longitudinal positioning parts on the corresponding sides correspondingly and abut against the transverse positioning parts. According to the combustion heat exchange assembly disclosed by the utility model, the assembling efficiency and the assembling precision of the combustion heat exchange assembly can be improved, and the probability of smoke leakage of the combustion heat exchange assembly is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion, in particular to a combustion heat exchange assembly. Background Art

[0002] A gas water heater is a device that heats water by high-temperature flue gas generated by combustion to obtain hot water. It is widely used in household life due to its small volume and high heating efficiency. The core components of a gas water heater are a combustion system composed of a burner assembly, a heat exchanger, and an exhaust assembly.

[0003] The combustion system provided by the prior art generally includes an exhaust assembly, a heat exchanger, a combustion chamber, and a burner assembly that are connected in sequence from top to bottom. The heat exchanger has two end plates arranged oppositely, a heat exchange fin assembly located between the two end plates, and heat exchange tubes passing through the heat exchange fin assembly. Flanges are turned outwards on the upper and lower sides and the front and rear sides of the end plates. The upper flange is fitted and firmly connected to the smoke collecting hood of the exhaust assembly, and the lower and front and rear flanges are fixed to the combustion chamber.

[0004] For the combustion system provided by the prior art, the heat exchanger is fixed to the smoke collecting hood and the combustion chamber through the flanges on the four sides of the heat exchanger end plate. In this assembly method, there is a problem of smoke leakage due to the obvious gap between the smoke collecting hood and the heat exchanger, which affects the use reliability of the combustion system; at the same time, this setting is not conducive to improving the assembly efficiency of the combustion system. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a combustion heat exchange assembly, which can effectively solve the problems of low assembly efficiency and easy smoke leakage existing in the existing combustion heat exchange assembly, and improve the assembly efficiency and the sealing performance after assembly of the combustion heat exchange assembly.

[0006] The above technical problem is solved by the following technical solutions:

[0007] A combustion heat exchange assembly includes:

[0008] A combustion chamber assembly having a combustion chamber that penetrates up and down. The front and rear sides of the combustion chamber assembly are higher than the left and right sides of the combustion chamber assembly, and the upper ends of the front and rear sides of the combustion chamber assembly have insertion positioning parts. The insertion positioning parts include a longitudinal positioning part extending upwards and a transverse positioning part connected to the outer side of the lower end of the longitudinal positioning part;

[0009] A heat exchanger is erected on the upper ends of the left and right sides of the combustion chamber assembly and is located between the front and rear sides of the combustion chamber assembly;

[0010] The smoke collecting hood, the left and right sides of the smoke collecting hood are respectively inserted between the left and right side end plates of the heat exchanger, and the lower ends of the front and rear sides of the smoke collecting hood are respectively located outside the corresponding longitudinal positioning parts on each side and are in contact with the transverse positioning parts.

[0011] Compared with the background art, the combustion heat exchange assembly of the present utility model has the following beneficial effects: Since the front and rear ends of the combustion chamber assembly are higher than the left and right ends, and the heat exchanger is erected on the upper ends of the left and right sides of the combustion chamber assembly, an installation space for installing the heat exchanger is formed between the upper ends of the front and rear sides of the combustion chamber assembly. Furthermore, the upper ends of the front and rear sides of the combustion chamber assembly form the front and rear shell structures of the heat exchanger. The heat exchanger does not need to be additionally matched with a shell structure, which simplifies the structure of the combustion heat exchange assembly and reduces the processing and assembly difficulty of the combustion heat exchange assembly; Since the left and right sides of the smoke collecting hood are respectively inserted between the left and right side end plates of the heat exchanger, and the lower ends of the front and rear sides of the smoke collecting hood are respectively located outside the longitudinal positioning parts and are in contact with the transverse positioning parts, the two side end plates of the heat exchanger limit the installation position of the smoke collecting hood in the left and right directions, the two longitudinal positioning parts limit the installation position of the smoke collecting hood in the front and rear directions, and the two transverse positioning parts define the installation position of the smoke collecting hood in the vertical direction. Thus, the assembly of the smoke collecting hood in all directions is effectively positioned, improving the assembly efficiency and assembly accuracy of the combustion chamber assembly, the heat exchanger and the smoke collecting hood, and reducing the number of parts required for fastening the smoke collecting hood, further reducing the cost of the combustion heat exchanger; Moreover, since the left and right sides of the smoke collecting hood are located between the two side end plates of the heat exchanger, at least part of the left and right sides of the smoke collecting hood and the side end plates overlap in the vertical direction, and the lower ends of the front and rear sides of the smoke collecting hood overlap with the longitudinal positioning parts in the vertical direction, so as to effectively reduce the installation gap between the heat exchanger and the smoke collecting hood and between the smoke collecting hood and the combustion chamber assembly in the horizontal direction, reducing the probability of smoke leakage from the heat exchanger and improving the sealing performance and use reliability of the combustion heat exchange assembly.

[0012] In one embodiment, the smoke collecting hood has two first hood side plates that are opposite and spaced apart in the front and rear directions. The lower end of the first hood side plate is stamped outward to form a positioning press molding. An open-bottomed press molding groove is formed inside the positioning press molding, and the longitudinal positioning part is inserted into the press molding groove;

[0013] And / or, the lower end of the smoke collecting hood has two first hood side plates that are opposite and spaced apart in the front and rear directions. The lower end of the first hood side plate is bent outward to form a sealing folded edge, and the sealing folded edge is attached to the upper side of the transverse positioning part.

[0014] In one embodiment, the length of the press molding groove in the left and right directions is less than the length of the first hood side plate in the left and right directions, and the left and right sides of the press molding groove are closed.

[0015] In one embodiment, abutting members are convexly provided inwardly on both the front and rear sides of the combustion chamber assembly. The heat exchanger includes a heat exchange fin assembly located between the two side end plates, and the front and rear sides of the heat exchange fin assembly are respectively abutted against the two abutting members;

[0016] The longitudinal positioning portion is higher than the abutting member, and the distance between the two abutting members is less than or equal to the distance between the two longitudinal positioning portions.

[0017] In one embodiment, the distance between the two abutting members is d1, the distance between the two longitudinal positioning portions is d2, and d2 - d1 = 2 mm to 3 mm;

[0018] And / or, the lateral positioning portion is attached to the upper side of the abutting member.

[0019] In one embodiment, a guide plate portion is connected to the upper end of the side end plate, and the guide plate portion extends obliquely upward in a direction away from the other side end plate.

[0020] In one embodiment, a front flap is formed by folding the front side of the side end plate outward, and a rear flap is formed by folding the rear side of the side end plate outward. A front mounting structure is provided on the front flap, a rear mounting structure is provided on the rear flap, and the front mounting structure and the rear mounting structure are fastened to the combustion chamber assembly;

[0021] The rear mounting structure is arranged in a vertical offset with respect to the front flap, or the front mounting structure is arranged in a vertical offset with respect to the rear flap.

[0022] In one embodiment, the combustion chamber assembly includes an inner housing and an outer housing sleeved outside the inner housing. The inner wall of the inner housing encloses a combustion chamber, and a cooling air duct is formed by enclosing the inner housing and the outer housing. A main air inlet communicating with the cooling air duct is provided on the outer housing, and an air outlet is provided on the inner housing. The main air inlet and the air outlet are arranged in a vertical offset, and a flow guiding member is provided at the main air inlet. The flow guiding member guides the cooling air flow entering from the main air inlet to flow vertically toward the air outlet.

[0023] In one embodiment, the flow guiding member is a louver structure formed by inwardly stamping the outer housing. The flow guiding member includes a main flow guiding portion vertically arranged in the cooling air duct and a flow blocking portion connected between the main flow guiding portion and the periphery of the main air inlet. A flow guiding outlet is formed between the end of the main flow guiding portion facing the air outlet and the inner wall surface of the outer housing.

[0024] In one embodiment, the width of the cooling air duct is W1, and the distance between the main air guiding portion and the edge of the main air inlet is W2, where W2 = 0.7W1 to 0.95W1;

[0025] And / or, the width of the cooling air duct is W1, and the height of the main air guiding portion in the vertical direction is H, where 4 mm ≤ H ≤ 7 mm.

[0026] In one embodiment, the main air inlet is arranged at the upper end of the outer housing, the air outlet is arranged at the lower end of the inner housing, and an auxiliary air inlet is further formed at the lower end of the outer housing. The auxiliary air inlet and the air outlet are arranged in a vertical dislocation manner, and the ventilation area of the auxiliary air inlet is smaller than that of the main air inlet.

[0027] In one embodiment, the plug-in positioning portion is integrally formed at the upper end of the outer housing. Description of the Drawings

[0028] Figure 1 is a schematic exploded view of the combustion heat exchange assembly provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic assembled view of the combustion heat exchange assembly provided by an embodiment of the present invention;

[0030] Figure 3 is Figure 2 a partial enlarged view of I in

[0031] Figure 4 is a cross-sectional view of the combustion heat exchange assembly provided by an embodiment of the present invention in a section;

[0032] Figure 5 is Figure 4 a partial enlarged view of J in

[0033] Figure 6 is a cross-sectional view of the combustion heat exchange assembly provided by an embodiment of the present invention in another section;

[0034] Figure 7 is Figure 6 a partial enlarged view of K in

[0035] Figure 8 is a schematic structural view of the heat exchanger provided by an embodiment of the present invention;

[0036] Figure 9 is a front view of the heat exchanger provided by an embodiment of the present invention;

[0037] Figure 10 is a cross-sectional view of the combustion chamber assembly provided by an embodiment of the present invention in a section;

[0038] Figure 11 A cross-sectional view of the combustion chamber assembly provided by the embodiment of the present utility model under another section plane;

[0039] Figure 12 A schematic diagram of the disassembled structure of the combustion chamber assembly provided by the embodiment of the present utility model;

[0040] Figure 13 is Figure 12 A partial enlarged view of the L position in

[0041] Label description:

[0042] 1. Combustion chamber assembly; 11. Outer frame; 111. Outer back plate; 112. Outer side plate; 113. Outer upward flanging part; 114. Outer front flanging part; 1141. First jack; 1142. Third jack; 115. Outer edge part; 116. Fixed edge part; 12. Outer front plate; 13. Inner frame; 131. Inner back plate; 132. Inner side plate; 133. Inner upward flanging part; 134. Inner front flanging part; 1341. Second jack; 135. First plug part; 14. Inner front plate; 141. Inner main board part; 142. Positioning flanging part; 143. Second plug part; 15. Insertion and positioning part; 151. Longitudinal positioning part; 152. Transverse positioning part; 16. Abutting member; 161. Abutting plate part; 162. Top plate part; 163. Bottom plate part; 164. Side sealing plate part; 165. Cavity; 17. Cooling air duct; 18. Main air inlet; 18a. First main air inlet; 18b. Second main air inlet; 19. Flow guiding member; 191. Main flow guiding part; 192. Flow blocking part; 110. Air outlet; 120. Auxiliary air inlet; 130. Combustion chamber;

[0043] 2. Heat exchanger; 21. Heat exchange end plate; 211. Side end plate; 212. Guide plate part; 213. Front flap; 2131. Front mounting structure; 214. Rear flap; 2141. Rear mounting structure; 215. Lower flap; 22. Heat exchange fin assembly; 221. Heat exchange single fin; 23. Heat exchange tube;

[0044] 3. Smoke collecting hood; 31. First hood side plate; 311. Positioning profiling; 312. Profiling groove; 32. Mounting plate part; 33. Sealing fold;

[0045] 4. Burner assembly; 5. Fan assembly; 6. Smoke exhaust pipe. Detailed implementation manners

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0048] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0049] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0050] This embodiment provides a combustion heat exchange assembly, which can be applied to gas water heating equipment to heat water through combustion heat exchange, improve the heat exchange performance of the combustion heat exchange assembly, reduce heat loss during the heat exchange process, and improve the energy efficiency of the gas water heater. The gas water heating equipment can be a gas water heater or a gas wall-mounted boiler.

[0051] Specifically, as Figures 1 - 3As shown in the figure, the combustion heat exchange assembly includes a combustion chamber assembly 1, a heat exchanger 2, a smoke collecting hood 3, and a burner assembly 4. Among them, the combustion chamber assembly 1 has a combustion chamber 130 that penetrates up and down. The front and rear sides of the combustion chamber assembly 1 are higher than the left and right sides of the combustion chamber assembly 1, and the upper ends of the front and rear sides of the combustion chamber assembly 1 have insertion positioning parts 15. The insertion positioning parts 15 include a longitudinal positioning part 151 that extends upward and a transverse positioning part 152 connected to the outer side of the lower end of the longitudinal positioning part 151; the heat exchanger 2 is installed on the upper ends of the left and right sides of the combustion chamber assembly 1 and is located between the front and rear sides of the combustion chamber assembly 1; the left and right sides of the smoke collecting hood 3 are respectively inserted between the left and right side end plates 211 of the heat exchanger 2, and the lower ends of the front and rear sides of the smoke collecting hood 3 are respectively located outside the corresponding longitudinal positioning part 151 and abut against the transverse positioning part 152; the burner assembly 4 is installed below the combustion chamber assembly 1 to introduce gas and realize ignition and combustion.

[0052] When the combustion heat exchange assembly is in use, gas enters the burner assembly 4 through a gas pipe and is ignited and burned. The high-temperature flue gas generated by the combustion of the burner assembly 4 flows upward into the combustion chamber 130 and then flows through the combustion chamber 130 to the heat exchanger 2; when the high-temperature flue gas flows through the heat exchanger 2, it exchanges heat with water or other heat exchange media inside the heat exchange pipe 23, so that the heat exchange medium is heated, the high-temperature flue gas is cooled and flows upward to the smoke collecting hood 3 to be converged; the flue gas inside the smoke collecting hood 3 can be directly discharged to the outside through a smoke exhaust pipe 6 or flow to other heat exchange devices such as a condensation heat exchanger 2.

[0053] The combustion heat exchange assembly provided in this embodiment has the front and rear ends of the combustion chamber 130 assembly higher than the left and right ends, and the heat exchanger 2 is installed on the upper sides of the left and right sides of the combustion chamber assembly 1, so that an installation space for installing the heat exchanger 2 is formed between the upper ends of the front and rear sides of the combustion chamber assembly 1. Furthermore, the upper ends of the front and rear sides of the combustion chamber assembly 1 form the front and rear shell structures of the heat exchanger 2. The heat exchanger 2 does not need to be additionally matched with a shell structure, which simplifies the structure of the combustion heat exchange assembly and reduces the processing and assembly difficulty of the combustion heat exchange assembly. Since the left and right sides of the smoke collecting hood 3 are respectively inserted between the left and right end plates 211 of the heat exchanger 2, and the lower ends of the front and rear sides of the smoke collecting hood 3 are respectively located outside the longitudinal positioning parts 151 and abut against the transverse positioning parts 152, the two side end plates 211 of the heat exchanger 2 limit the installation position of the smoke collecting hood 3 in the left and right directions, the two longitudinal positioning parts 151 limit the installation position of the smoke collecting hood 3 in the front and rear directions, and the two transverse positioning parts 152 define the installation position of the smoke collecting hood 3 in the vertical direction. Thus, the assembly of the smoke collecting hood 3 in all directions is effectively positioned, which improves the assembly efficiency and assembly accuracy of the combustion chamber assembly 1, the heat exchanger 2 and the smoke collecting hood 3, and can reduce the components required for fastening the smoke collecting hood 3, further reducing the cost of the combustion heat exchanger 2. Moreover, since the left and right sides of the smoke collecting hood 3 are located between the two side end plates 211 of the heat exchanger 2, at least part of the left and right sides of the smoke collecting hood 3 and the side end plates 211 overlap in the vertical direction, and the lower ends of the front and rear sides of the smoke collecting hood 3 overlap with the longitudinal positioning parts 151 in the vertical direction. Therefore, the installation gap between the heat exchanger 2 and the smoke collecting hood 3 and between the smoke collecting hood 3 and the combustion chamber assembly 1 in the horizontal direction can be effectively reduced, the probability of smoke leakage from the heat exchanger 2 is reduced, and the sealing performance and use reliability of the combustion heat exchange assembly are improved.

[0054] The combustion heat exchange assembly further includes a fan assembly 5, and the fan assembly 5 is used to guide the flue gas to flow through the combustion chamber 130, the heat exchanger 2 and the smoke collecting hood 3 in sequence from bottom to top. In one embodiment, the fan assembly 5 is installed on the smoke collecting hood 3. In another embodiment, the fan assembly 5 is located on the lower side of the combustion chamber assembly 1, that is, the fan assembly 5 blows air upward to promote the upward flow of the flue gas. The installation position and installation structure of the fan assembly 5 can be specifically set with reference to the prior art, which is not the focus of the present invention and will not be elaborated here.

[0055] As Figures 3 to 5As shown in the figure, to improve the cooperation reliability and convenience between the smoke collecting hood 3 and the insertion positioning part 15, in an embodiment, the smoke collecting hood 3 has two first hood side plates 31 that are opposite and spaced in the front-back direction. The lower end of the first hood side plate 31 is stamped outward to form a positioning press mold 311. An inwardly open press mold groove 312 is formed inside the positioning press mold 311. The longitudinal positioning part 151 is inserted into the press mold groove 312. By providing the positioning press mold 311, the positioning press mold 311 can squeeze the longitudinal positioning part 151 inward, ensuring the tightness of the cooperation between the positioning press mold 311 and the longitudinal positioning part 151, and further reducing the assembly gap between the smoke collecting hood 3 and the combustion chamber assembly 1. At the same time, the setting of the positioning press mold 311 can increase the structural strength and stiffness at the lower ends of the front and rear sides of the smoke collecting hood 3, reducing the probability of deformation of the lower end of the first hood side plate 31 due to extrusion. In other embodiments, the lower end of the first hood side plate 31 can be integrally in a flat plate structure, and the longitudinal positioning part 151 can be directly inserted inside the first hood side plate 31.

[0056] In an embodiment, the length of the positioning press mold 311 in the left-right direction is less than the length of the first hood side plate 31 in the left-right direction, and the left and right sides of the press mold groove 312 are closed. This can ensure that while the longitudinal positioning part 151 is inserted into the press mold groove 312, the gap between the first hood side plate 31 and the longitudinal positioning part 151 is reduced, preventing flue gas from flowing out through the left and right sides of the press mold groove 312 and reducing the probability of smoke leakage. Further, the length of the press mold groove 312 in the left-right direction is equal to or slightly less than the length of the longitudinal positioning part 151 to ensure the tightness of their cooperation. The depth of the press mold groove 312 is slightly greater than the thickness of the longitudinal positioning part 151 to reduce the obstruction during assembly.

[0057] To better ensure the stability and sealing performance after the assembly of the smoke collecting hood 3 and the combustion chamber assembly 1, the lower end of the first hood side plate 31 extends outward with a sealing flange 33. The sealing flange 33 is attached to the upper side of the transverse positioning part 152, which can increase the contact area between the front and rear sides of the smoke collecting hood 3 and the transverse positioning part 152, thereby increasing the sealing performance after the assembly of the smoke collecting hood 3 and the combustion chamber assembly 1. Further, the extending width of the sealing flange 33 is less than the width of the transverse positioning part 152 in the front-back direction.

[0058] As Figures 6 to 9As shown in the figure, the heat exchanger 2 includes heat exchange tubes 23, heat exchange end plates 21 and a heat exchange fin assembly 22. Among them, two heat exchange end plates 21 are spaced apart in the left - right direction. Each heat exchange end plate 21 includes a side end plate 211 perpendicular to the left - right direction; the heat exchange fin assembly 22 is arranged between the two heat exchange end plates 21, and the heat exchange fin assembly 22 includes a plurality of heat exchange single fins 221 arranged side by side in the left - right direction. There is a vertically - through flow gap between two adjacent heat exchange single fins 221 for the flue gas to flow through; the length of the heat exchange single fin 221 in the front - back direction is less than the length of the heat exchange end plate 21 in the front - back direction. The heat exchange tubes 23 include a plurality of heat exchange straight pipe segments bent and connected in sequence. Each heat exchange straight pipe segment extends in the left - right direction and penetrates through all the heat exchange fins. One heat exchange straight pipe segment is connected to a water inlet pipe, and the other heat exchange straight pipe segment is connected to a water outlet pipe. It can be understood that the specific structures of the heat exchange fin assembly 22 and the heat exchange tubes 23 can be set with reference to the prior art, which is not the focus of the present utility model and will not be elaborated here.

[0059] To realize the installation between the smoke collecting hood 3 and the heat exchanger 2, in one embodiment, mounting plate portions 32 are respectively formed at the lower ends of the left and right sides of the smoke collecting hood 3. The mounting plate portions 32 are located inside the side end plates 211 and are fixedly connected to the side end plates 211 through fasteners. That is, in this implementation manner, only the left and right sides of the smoke collecting hood 3 are fastened to the corresponding side end plates 211, and the front and back sides are not fastened to the combustion chamber assembly 1. Thus, the number of fasteners can be reduced, the cost of the combustion heat exchange assembly can be lowered, and the assembly efficiency of the combustion heat exchange assembly can be improved. In another embodiment, it can also be that the front and back sides of the smoke collecting hood 3 are fastened to the longitudinal positioning portion 151 through fasteners. In still another embodiment, it can also be that the left and right sides of the smoke collecting hood 3 are respectively fastened to the side end plates 211 through fasteners, and the front and back sides of the smoke collecting hood 3 are respectively fastened to the longitudinal positioning portion 151 through fasteners.

[0060] A first fastening hole is provided on the side end plate 211. A plurality of first fastening holes are spaced apart in the front - back direction. A second fastening hole is provided on the mounting plate portion 32. The second fastening holes are arranged in one - to - one correspondence with the first fastening holes. The side end plate 211 and the mounting plate portion 32 are connected through fasteners passing through the first fastening holes and the second fastening holes. Thereby, the connection stability and firmness between the smoke collecting hood 3 and the heat exchanger 2 can be improved. The lower ends of the mounting plate portions 32 are spaced above the heat exchange fin assembly 22 to avoid interference between the mounting plate portions 32 and the heat exchange fin assembly 22.

[0061] To improve the assembly efficiency of the smoke collecting hood 3 and the heat exchanger 2, in one embodiment, a guiding plate portion 212 is connected to the upper end of the side end plate 211. The guiding plate portion 212 extends obliquely upward in a direction away from the other side end plate 211. The two guiding plate portions 212 can guide the left and right sides of the smoke collecting hood 3 to be inserted between the side end plates 211. Further, the angle between the guiding plate portion 212 and the vertical direction is 45° - 60°.

[0062] As Figure 5 and Figure 10 shown, in order to further improve the heat exchange efficiency of the combustion heat exchange assembly, in one embodiment, abutting members 16 are convexly provided inwardly on both the front and rear sides of the combustion chamber assembly 1, the front and rear sides of the heat exchange fin assembly 22 are respectively abutted against the two abutting members 16, the longitudinal positioning portion 151 is higher than the abutting members 16, and the distance between the two abutting members 16 is less than or equal to the distance between the two longitudinal positioning portions 151.

[0063] By providing the abutting members 16 on both the front and rear sides of the combustion chamber assembly 1, and the front and rear sides of the heat exchange fin assembly 22 are respectively abutted against the two abutting members 16, the abutting members 16 can fill the lateral gap formed by enclosing the two side end plates 211 and the heat exchange fin assembly 22, increasing the resistance of the flue gas flowing to the heat exchanger 2 passing through the lateral gap. Thus, it can reduce or avoid the flow of the flue gas along the heat exchange fins to the two ends in the front and rear directions of the combustion chamber assembly 1, enabling most of the high-temperature flue gas to contact the middle part of the heat exchange fins and exchange heat with the heat exchange tubes 23, reducing heat loss and improving the heat exchange efficiency; since the inserted positioning portion 15 is higher than the abutting members 16, it can simplify the structural settings of the inserted positioning portion 15 and the abutting members 16, reducing the processing difficulty of the combustion chamber assembly 1; since the distance between the two abutting members 16 is less than or equal to the distance between the two longitudinal positioning portions 151, the heat exchange fin assembly 22 can be inserted between the two abutting members 16 through the gap between the two longitudinal positioning portions 151 to avoid the setting of the longitudinal positioning portion 151 interfering with the assembly of the heat exchanger 2.

[0064] In one embodiment, the distance between the two abutting members 16 is d1, the distance between the two longitudinal positioning portions 151 is d2, and d2 - d1 = mm1 to 4 mm, so as to ensure that the heat exchanger 2 can be inserted between the two abutting members 16 through the two longitudinal positioning portions 151 while reducing the probability of the flue gas flowing out of the heat exchanger 2 flowing forward or backward due to the excessive distance between the two longitudinal positioning portions 151, that is, reducing the probability of smoke leakage. Preferably, d2 - d1 = mm2 to 3 mm.

[0065] In one embodiment, the abutting members 16 are higher than the heat exchange fin assembly 22 and higher than the lower end of the mounting plate portion 32, thereby better guiding the flue gas to flow upward into the smoke collecting hood 3 and improving the effect of flue gas diversion. Further, the lower end of the abutting members 16 is equal to or lower than the lower end of the side edge of the single heat exchange fin 221 to increase the filling effect of the gap between the heat exchange fin assembly 22 and the two heat exchange end plates 21. The length of the abutting members 16 in the left-right direction is approximately equal to the distance between the two side end plates 211, so that the two outermost single heat exchange fins 221 of the heat exchange fin assembly 22 are both abutted against the abutting members 16, maximizing the filling effect of the abutting members 16 on the lateral gap.

[0066] As Figure 2 , Figure 8 and Figure 9 shown, to improve the assembly reliability between the heat exchanger 2 and the combustion chamber assembly 1, a lower flap 215 is formed by folding the lower side of the side end plate 211. The lower flap 215 supports the upper ends of the left and right sides of the combustion chamber assembly 1 to increase the contact area between the heat exchanger 2 and the combustion chamber assembly 1 and ensure the assembly reliability of the heat exchanger 2 on the combustion chamber assembly 1. A front flap 213 is formed by folding the front side of the side end plate 211 outward, and a rear flap 214 is formed by folding the rear side of the side end plate 211 outward. The front flap 213 and the rear flap 214 are respectively abutted against the front and rear sides of the combustion chamber assembly 1 to better limit the installation position of the heat exchanger 2 relative to the combustion chamber assembly 1 in the front-rear direction.

[0067] In one embodiment, a front mounting structure 2131 is provided on the front flap 213, and a rear mounting structure 2141 is provided on the rear flap 214. Both the rear mounting structure 2141 and the front mounting structure 2131 are used for fastening with the combustion chamber 130 assembly. The rear mounting structure 2141 is vertically offset from the front flap 213. With this arrangement, when assembling the heat exchanger 2 and the combustion chamber assembly 1 from the front side of the combustion heat exchange assembly, both the front mounting structure 2131 and the rear mounting structure 2141 can be exposed to the operator's view, so that the operator can perform the installation operations on the front mounting structure 2131 and the rear mounting structure 2141 at the same position, improving the assembly convenience and thus enhancing the assembly efficiency.

[0068] In another embodiment, the front mounting structure 2131 is vertically offset from the rear flap 214. Thus, when the operator assembles the heat exchanger 2 and the combustion chamber assembly 1 from the rear side of the combustion heat exchange assembly, both the front mounting structure 2131 and the rear mounting structure 2141 are exposed to the operator's view.

[0069] Vertically, the rear mounting structure 2141 is higher than the heat exchange tubes 23 and the front flap 213, which can avoid the front shielding of the rear mounting structure 2141 caused by the heat exchange tubes 23 and the front flap 213 and further improve the assembly convenience. Further, both the front flap 213 and the rear flap 214 extend to the lower side of the side end plate 211 to increase the overall structural strength and stiffness of the heat exchange end plate 21.

[0070] The front mounting structure 2131 includes a front mounting hole, and the front flap 213 is fixedly connected to the combustion chamber assembly 1 through a front fixing member passing through the front mounting hole and the combustion chamber assembly 1; the rear mounting structure 2141 includes a rear mounting hole, and the rear flap 214 is fixedly connected to the combustion chamber assembly 1 through a rear fixing member passing through the rear mounting hole and the combustion chamber assembly 1. Thereby, the connection reliability between the heat exchanger 2 and the combustion chamber assembly 1 is improved.

[0071] In one embodiment, the distance between the center of the rear mounting structure 2141 and the upper end of the front flap 213 is D, where D ≥ 5 mm, which is conducive to the operator's screwing operation on the rear fixing member. Further, D = 5 mm to 15 mm, which provides sufficient operating space for the operator and avoids the problem of increased height requirements for the heat exchanger 2 due to an excessive distance between the two.

[0072] As Figures 10 to 13 shown, the combustion chamber assembly 1 includes an inner housing and an outer housing sleeved outside the inner housing. The inner wall of the inner housing encloses a combustion chamber 130, and the inner housing and the outer housing enclose a cooling air duct 17. The outer housing is provided with a main air inlet 18 communicating with the cooling air duct 17, and the inner housing is provided with an air outlet 110. The main air inlet 18 and the air outlet 110 are arranged in a vertical offset.

[0073] By providing the cooling air duct 17, external cooling air can enter the cooling air duct 17 through the main air inlet hole and be discharged from the air outlet 110, so that the cooling air can cool the inner and outer walls of the combustion chamber assembly 1, enhance the heat dissipation of the combustion chamber assembly 1, avoid excessive temperature rise on the outer wall surface of the combustion chamber assembly 1 during the combustion process, and improve the use safety and reliability of the combustion heat exchange assembly. Both the outer housing and the inner housing are made of reflective heat-insulating materials to reduce the radiation of heat to the outside of the combustion chamber assembly 1 and lower the temperature of the outer wall surface of the combustion chamber assembly 1.

[0074] In one embodiment, a flow guiding member 19 is provided at the main air inlet 18. The flow guiding member 19 guides the cooling air entering from the air inlet to flow vertically towards the air outlet 110, thereby avoiding the problem that the cooling air entering the cooling air duct 17 from the main air inlet 18 impacts the inner housing and causes resonance of the combustion chamber assembly 1, and reducing the noise during the operation of the combustion heat exchange assembly; at the same time, the setting of the flow guiding member 19 can prevent the cooling air entering from the air inlet from flowing back to the main air inlet 18 after impacting and colliding with the inner housing, thereby avoiding the problem of air flow impact at the main air inlet 18, reducing the air inlet resistance, increasing the air inlet flow rate, and further enhancing the cooling effect of the cooling air on the inner housing and the outer housing, and improving the cooling effect on the combustion chamber assembly 1.

[0075] In one embodiment, the main air inlet 18 is provided at least at the upper end of the outer housing, and the air outlet 110 is provided near the lower end of the inner housing, thereby increasing the distance between the main air inlet 18 and the air outlet 110, increasing the coverage range of the cooling air duct 17 in the height direction, and enhancing the cooling effect on the combustion chamber assembly 1. In other embodiments, it is also possible that the main air inlet 18 is provided near the lower end of the outer housing, and the air outlet 110 is provided near the upper end of the inner housing.

[0076] The cooling air duct 17 is arranged around the combustion chamber 130, and the cooling air duct 17 is arranged on each side of the combustion chamber 130, improving the cooling effect on the combustion chamber assembly 1. Thus, it can better ensure that the temperature on each side of the combustion chamber assembly 1 can be within a reasonable range, avoiding the performance of the combustion chamber assembly 1 being affected due to excessive local temperature rise of the combustion chamber assembly 1.

[0077] To cooperate with the formation of the structure with lower left and right sides and higher front and rear sides of the combustion chamber assembly 1, both the outer housing and the inner housing are of the structure with lower left and right sides and higher front and rear sides. To improve the cooling effect, the main air inlets 18 on the front and rear sides of the outer housing are higher than the main air inlets 18 on the left and right sides of the outer housing, so that the cooling air duct 17 on each side of the combustion chamber assembly 1 can extend to the corresponding upper end on that side as much as possible, enhancing the action range of the cooling air duct 17 and improving the cooling effect on the outer wall surface of the combustion chamber assembly 1.

[0078] For the convenience of subsequent description, the main air inlets 18 on the front and rear sides of the combustion chamber 130 are referred to as the first main air inlets 18a, and the main air inlets 18 on the left and right sides of the outer housing are referred to as the second main air inlets 18b. The main air inlets 18 on each side of the outer housing are arranged at intervals in the width direction of the corresponding side, ensuring the action range of the cooling air flow in the width direction of the corresponding side while reducing the size of a single main air inlet 18.

[0079] As Figure 7 and Figures 10 to 13 shown, in an embodiment, the guiding component 19 is a louver structure formed by stamping the outer housing inward. The guiding component 19 includes a main guiding portion 191 vertically arranged in the cooling air duct 17 and a baffle portion 192 connected between the main guiding portion 191 and the periphery of the main air inlet 18. A guiding outlet is formed between the end of the main guiding portion 191 facing the air outlet 110 and the inner wall surface of the outer housing. This kind of guiding component 19 has a simple structure and is easy to process, and can effectively reduce the processing cost. It can be understood that both the main air inlet 18 and the guiding outlet are naturally formed when stamping the louver structure.

[0080] In an embodiment, the included angle between the baffle portion 192 on the side facing the guiding outlet and the main guiding portion 191 is set to be an obtuse angle, so as to facilitate guiding the air flow acting on the baffle portion 192 to flow along the main guiding portion 191 towards the guiding outlet. Further, the included angle between the baffle portion 192 and the main guiding portion 191 is 110° - 140°.

[0081] The width of the cooling air duct 17 is W1, and W1 is preferably 4 mm - 8 mm, so as to avoid the overall size of the combustion heat exchange assembly increasing due to the too large width of the cooling air duct 17, and at the same time avoid the cooling air flow not flowing smoothly due to the too small width of the cooling air duct 17. Further, W1 = 5 mm - 6 mm.

[0082] In one embodiment, the distance between the main air guiding portion 191 and the outer side surface of the outer housing is W2, and W2 = 0.75W1 to 0.95W. Thus, it can be ensured that the main air guiding portion 191 is spaced apart from both the outer housing and the inner housing, while preventing the main air guiding portion 191 from being too close to the outer housing and affecting the air intake volume of the main air inlet 18. Preferably, W = 0.85W to 0.95W. Specifically, W = 4 mm to 5 mm.

[0083] In one embodiment, the length of the main air guiding portion 191 in the vertical direction is H, and H = 4 mm to 7 mm, so as to ensure that the cooling air flow entering from the air inlet has sufficient length for air guiding. Further, H = 5 mm to 6 mm.

[0084] In one embodiment, the abutting member 16 has a cavity 165, thereby reducing the outward radiation of heat at the heat exchanger 2. The cavity 165 of the abutting member 16 communicates with the cooling air duct 17 on the same side, thereby cooling the abutting member 16 and further reducing the outward radiation of heat at the heat exchanger 2, and preventing local high temperatures from occurring at the upper ends of the front and rear sides of the combustion chamber assembly 1. In other embodiments, the abutting member 16 may also be a solid structure, or the abutting member 16 is a cavity structure, and the cavity is filled with heat insulating material.

[0085] To further enhance the heat dissipation effect at the abutting member 16, the first main air inlet 18a is arranged opposite to the cavity 165 of the abutting member 16, so that part of the cooling air flow can directly enter the cavity 165 through the main air inlet 18, enhancing the heat dissipation effect at the abutting member 16.

[0086] Since the cooling air flow entering the cooling air duct 17 from the main air inlet 18 absorbs heat and rises in temperature during the downward flow, and the temperature of the combustion chamber assembly 1 is higher at the lower end because it is closer to the burner assembly 4, in one embodiment, an auxiliary air inlet 120 is provided at the lower end of the outer housing. The auxiliary air inlet 120 communicates with the cooling air duct 17, and the auxiliary air inlet 120 and the air outlet 110 are spaced apart in the vertical direction. The ventilation area of the auxiliary air inlet 120 is smaller than the ventilation area of the main air inlet 18. Thus, the lower end of the combustion chamber assembly 1 can be cooled by the cooling air flow entering through the auxiliary air inlet 120, preventing local high temperatures from occurring at the lower end of the combustion chamber assembly 1.

[0087] In one embodiment, on the same side of the outer housing, the ventilation area of all the main air inlets 18 is S1, and the ventilation area of all the auxiliary air inlets 120 is S2, where S1 = 7S2 to 15S2. This can ensure that most of the cooling air flow enters the cooling air duct 17 through the main air inlets 18, avoiding waste of air volume caused by the relatively close distance between the auxiliary air inlets 120 and the air outlet 110. At the same time, it can also ensure the air intake volume of the main air inlets 18 while avoiding a large loss of power to the fan assembly 5. Preferably, S1 = 10S2 to 11S2.

[0088] The auxiliary air inlets 120 are round holes or hole structures of other shapes, and no flow guiding components 19 are provided at the auxiliary air inlets 120 to simplify the structure of the combustion chamber assembly 1 and reduce the processing cost of the combustion chamber assembly 1.

[0089] In one embodiment, the auxiliary air inlets 120 are arranged lower than the air outlet 110 so that the auxiliary air inlets 120 are as close as possible to the lower end of the combustion chamber assembly 1, thereby enhancing the cooling effect on the lower end of the combustion chamber assembly 1. In other embodiments, the auxiliary air inlets 120 can also be arranged higher than the air outlet 110.

[0090] To improve the processing and assembly convenience of the outer housing and the inner housing, in one embodiment, the inner housing includes a U-shaped inner surrounding frame 13 and an inner front plate 14 detachably arranged on the front side of the inner surrounding frame 13. The U-shaped opening of the inner surrounding frame 13 faces forward, that is, the inner front plate 14 closes the U-shaped opening of the inner surrounding frame 13, and the inner surrounding frame 13 and the inner front plate 14 enclose to form a combustion chamber 130. The outer housing includes a U-shaped outer surrounding frame 11 with an opening facing forward and an outer front plate 12 detachably arranged on the front side of the outer surrounding frame 11. The outer front plate 12 is arranged on the front side of the inner front plate 14, and the outer front plate 12 and the inner front plate 14 enclose to form a cooling air duct 17 at the front side; the outer surrounding frame 11 is sleeved on the outside of the inner surrounding frame 13, and the outer surrounding frame 11 and the inner surrounding frame 13 enclose to form a cooling air duct 17. By arranging the inner surrounding frame 13 and the inner front plate 14 to enclose to form the inner housing, and arranging the outer surrounding frame 11 and the outer front plate 12 to enclose to form the outer housing, the processing and assembly convenience of the inner housing and the outer housing is effectively improved, and it is beneficial to form cooling air ducts 17 on all four sides of the combustion chamber 130.

[0091] The outer surrounding frame 11 includes two outer side plates 112 arranged opposite and spaced apart in the left-right direction and an outer back plate 111 connected between the two outer side plates 112. The upper end of the outer back plate 111 is higher than the upper end of the outer side plates 112 so that the upper end portions of the outer side plates 112 are used to cooperate with the heat exchanger 2. The inner surrounding frame 13 includes inner side plates 132 arranged opposite and spaced apart in the left-right direction and an inner back plate 131 connected between the two inner side plates 132. The outer side plates 112 and the inner side plates 132 are arranged opposite and spaced apart, the inner back plate 131 and the outer back plate 111 are arranged opposite and spaced apart, and cooling air ducts 17 are formed between the outer side plates 112 and the inner side plates 132 and between the inner back plate 131 and the outer back plate 111.

[0092] In one embodiment, to improve the assembly efficiency of the outer frame 11 and the inner frame 13, in one embodiment, the inner back plate 131 and the inner side plate 132 are integrally formed, and the outer back plate 111 and the outer side plate 112 are integrally formed. In other embodiments, the inner back plate 131 and the inner side plate 132 are detachably connected, and / or the outer back plate 111 and the outer side plate 112 are detachably connected.

[0093] In one embodiment, an insertion and positioning portion 15 is integrally formed at the upper end of the outer housing, which can simplify the structure of the insertion and positioning portion 15 and reduce the processing difficulty. Specifically, the upper ends of the outer back plate 111 and the outer front plate 12 are bent in the direction towards the combustion chamber 130 to form the above-mentioned horizontal positioning portion 152, and the end of the horizontal positioning portion 152 is turned upwards to form the above-mentioned vertical positioning portion 151.

[0094] In one embodiment, abutting members 16 are provided at the upper ends of the rear side and the front side of the inner frame 13, so that the abutting members 16 and the insertion and positioning portion 15 are respectively provided on the outer housing and the inner housing, reducing the processing difficulty. Further, the upper end of the inner front plate 14 is integrally bent to form an abutting member 16, and the upper end of the rear side of the inner back plate 131 is integrally bent to form an abutting member 16. This can reduce the processing difficulty of the abutting member 16 and improve the overall structural strength and stiffness of the inner frame 13 and the inner front plate 14. Specifically, the upper end of the inner back plate 131 is integrally bent to form an abutting member 16. In one embodiment, the horizontal positioning portion 152 is attached to the upper end of the abutting member 16 to limit the assembly position of the abutting member 16 and the outer housing.

[0095] For convenience of description, the abutting member 16 on the rear side is referred to as the rear abutting member 16b, and the abutting member 16 on the front side is referred to as the front abutting member 16a.

[0096] The inner back plate 131 is vertically folded forward to form a bottom plate portion 163. The front end of the bottom plate portion 163 is turned upwards to form an abutting plate portion 161. The upper end of the abutting plate portion 161 is turned backwards to form a top plate portion 162. The left and right sides of the abutting plate portion 161 are turned backwards to form side sealing plate portions 164. The bottom plate portion 163, the abutting plate portion 161, the top plate portion 162 and the two side sealing plate portions 164 enclose to form a rear abutting member 16b having a cavity 165. The width of the top plate portion 162 is greater than the width of the bottom plate portion 163, and the rear end of the top plate portion 162 abuts against the front side surface of the outer back plate 111, so that the outer back plate 111 closes the rear opening of the cavity 165 to reduce the gap between the rear abutting member 16b and the outer back plate 111. The gap between the bottom plate portion 163 and the outer back plate 111 is formed to be communicated so that the cavity 165 and the cooling air duct 17 are communicated.

[0097] The way the inner front plate 14 is bent to form the front abutting member 16a can refer to the way the inner back plate 131 is bent to form the rear abutting member 16b, which will not be elaborated here.

[0098] Specifically, the upper side, front side, and lower side of the inner side plate 132 are all turned outward to form inner flanging parts. The inner flanging parts, the inner side plate 132, and the outer side plate 112 enclose to form a cooling air duct 17. Among them, the inner flanging parts include an inner upper flanging part 133 located on the upper side of the inner side plate 132, an inner front flanging part 134 located on the front side of the inner side plate 132, and an inner lower flanging part located on the lower side of the inner side plate 132.

[0099] The upper side of the outer side plate 112 is turned outward to form an outer upper flanging part 113. The inner upper flanging part 133 is supported on the outer upper flanging part 113 and the two are connected by a fastening structure. The lower turning plate 215 part of the heat exchange end plate 21 is attached to the upper side of the inner upper flanging part 133. An outer retaining edge part 115 is turned upward on the outer side of the outer upper flanging part 113 to laterally block the inner upper flanging part 133 and the lower turning plate 215 part. The lower side of the outer side plate 112 is turned inward to form a lower outer flanging part, and the lower outer flanging part is located on the upper side of the inner lower flanging part and abuts against the inner side plate 132.

[0100] The front side of the outer side plate 112 is turned outward to form an outer front flanging part 114. A first jack 1141 is opened on the outer front flanging part 114. The inner front flanging part 134 extends backward with a first plug part 135, and the first plug part 135 is inserted into the first jack 1141 to realize the assembly positioning of the inner frame 13 and the outer frame 11.

[0101] The inner front plate 14 includes an inner main board part 141. The left and right sides of the inner main board part 141 are turned forward to form side folding edges. The front ends of the side folding edges are vertically turned outward to form positioning folding edges 142. The inner main board part 141 and the side folding edges are both inserted between the two inner side plates 132 to close the front opening of the inner frame 13, and the positioning folding edges 142 are attached to the front sides of the corresponding inner front flanging parts 134.

[0102] Furthermore, a second plug part 143 protrudes backward from the positioning folding edge 142. A second jack 1341 is opened on the outer front flanging part 114, and a third jack 1142 is opened on the inner front flanging part 134. The third jack 1142 and the second jack 1341 are aligned, and the second plug part 143 is inserted into the second jack 1341 and the third jack 1142 to realize the assembly positioning of the inner front plate 14, the inner frame 13, and the outer frame 11.

[0103] The left and right side edges of the outer front plate 12 are provided with front fastening holes, the left and right side edges of the inner front plate 14 and the inner front flanging part 134 are all provided with mounting through holes, and the outer front flanging part 114 is provided with rear fastening holes. The front fastening holes, the mounting through holes and the rear fastening holes are aligned from front to back so that the locking component sequentially passes through the front fastening holes, the mounting through holes and the rear fastening holes to realize the fastening among the four. Preferably, at least two front fastening holes are spaced in the vertical direction to ensure the fastening stability of the four.

[0104] In an embodiment, the upper ends of the left and right sides of the rear back plate extend outwards to form fixed edge parts 116, and the fixed edge parts 116 are attached to and fastened with the rear flanging plate 214 of the heat exchanger 2. The left and right sides of the outer front plate 12 are attached to and fastened with the front flanging plate 213 of the heat exchanger 2.

[0105] It can be understood that the above assembly structure of the outer shell and the inner shell is only an exemplary structure. The assembly structure between the outer shell and the inner shell can also be set with reference to the prior art, which is not the focus of the present invention and will not be elaborated here. In the specific content of the above specific implementation manner, the technical features can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not exist in contradiction, they should be considered as the scope recorded in this specification. The specific content of the above specific implementation manner only expresses several implementation manners of the present invention, and its description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A combustion heat exchange assembly, characterized in that: include: A combustion chamber assembly (1) having a combustion chamber (130) that is connected vertically, the front and rear sides of the combustion chamber assembly (1) being higher than the left and right sides of the combustion chamber assembly (1), and the upper ends of the front and rear sides of the combustion chamber assembly (1) having insertion positioning portions (15), the insertion positioning portions (15) comprising a longitudinal positioning portion (151) extending upward and a transverse positioning portion (152) connected to the outer side of the lower end of the longitudinal positioning portion (151); A heat exchanger (2) is mounted on the upper ends of the left and right sides of the combustion chamber assembly (1) and is located between the front and rear sides of the combustion chamber assembly (1); A smoke collecting hood (3), the left and right sides of the smoke collecting hood (3) are respectively inserted between the left and right side end plates (211) of the heat exchanger (2), and the front and rear lower ends of the smoke collecting hood (3) are respectively located on the outside of the longitudinal positioning portion (151) on the corresponding side and abut against the transverse positioning portion (152).

2. The combustion heat exchange assembly according to claim 1, characterized in that: The smoke collecting hood (3) comprises two first hood side plates (31) which are opposite to each other and spaced apart in the front-to-back direction, the lower end of the first hood side plates (31) is punched outward to form a positioning profile (311), the inner side of the positioning profile (311) forms a profile groove (312) which is open downward, and the longitudinal positioning portion (151) is inserted into the profile groove (312); And / or, the lower end of the smoke collecting hood (3) has two first hood side panels (31) that are opposite to each other and spaced apart in the front-to-back direction, the lower end of the first hood side panels (31) is bent outward to form a sealing fold (33), and the sealing fold (33) is attached to the upper side of the transverse positioning portion (152).

3. The combustion heat exchange assembly according to claim 2, characterized in that: The length of the pressed groove (312) in the left-right direction is smaller than the length of the first cover side plate (31) in the left-right direction, and the left and right sides of the pressed groove (312) are closed.

4. The combustion heat exchange assembly according to claim 1, characterized in that: The combustion chamber assembly (1) is provided with abutment components (16) protruding inwardly on both the front and rear sides, the heat exchanger (2) comprises a heat exchange fin assembly (22) located between the two side end plates (211), and the front and rear sides of the heat exchange fin assembly (22) are respectively in abutment with the two abutment components (16); The longitudinal positioning portion (151) is higher than the abutment component (16), and the distance between the two abutment components (16) is less than or equal to the distance between the two longitudinal positioning portions (151).

5. The combustion heat exchange assembly according to claim 4, characterized in that: The distance between the two abutting parts (16) is d1, and the distance between the two longitudinal positioning parts (151) is d2, d2-d1=2mm-3mm; And / or, the lateral positioning portion (152) is attached to the upper side of the abutment component (16).

6. The combustion heat exchange assembly according to claim 1, characterized in that: The upper end of the side end plate (211) is connected to a guide plate portion (212), and the guide plate portion (212) extends obliquely from bottom to top in a direction away from the other side end plate (211).

7. The combustion heat exchange assembly according to claim 1, characterized in that: The front side of the side end plate (211) is folded outward to form a front flap (213), and the rear side of the side end plate (211) is folded outward to form a rear flap (214). The front flap (213) is provided with a front mounting structure (2131), and the rear flap (214) is provided with a rear mounting structure (2141). The front mounting structure (2131) and the rear mounting structure (2141) are fastened to the combustion chamber assembly (1); The rear mounting structure (2141) and the front flap (213) are staggered in the vertical direction, or the front mounting structure (2131) and the rear flap (214) are staggered in the vertical direction.

8. The combustion heat exchange assembly according to any one of claims 1 to 7, characterized in that: The combustion chamber assembly (1) comprises an inner shell and an outer shell sleeved on the outer side of the inner shell, the inner wall of the inner shell encloses the combustion chamber (130), the inner shell and the outer shell enclose a cooling air duct (17), the outer shell is provided with a main air inlet (18) connected to the cooling air duct (17), the inner shell is provided with an air outlet (110), the main air inlet (18) and the air outlet (110) are staggered in the vertical direction, and a guide component (19) is provided at the main air inlet (18), and the guide component (19) guides the cooling airflow entering from the main air inlet (18) to flow toward the air outlet (110) in the vertical direction.

9. The combustion heat exchange assembly according to claim 8, characterized in that: The air guide component (19) is a shutter structure formed by inwardly stamping the outer shell, and the air guide component (19) comprises a main air guide portion (191) vertically arranged in the cooling air duct (17) and a flow blocking portion (192) connected between the main air guide portion (191) and the periphery of the main air inlet (18), and an air guide outlet is formed between one end of the main air guide portion (191) facing the air outlet (110) and the inner wall surface of the outer shell.

10. The combustion heat exchange assembly according to claim 9, characterized in that: The width of the cooling air duct (17) is W1, and the distance between the main air flow portion (191) and the edge of the main air inlet (18) is W2, where W2 = 0.7W1 to 0.95W1; And / or, the width of the cooling air duct (17) is W1, the height of the main air flow portion (191) in the vertical direction is H, and 4mm≤H≤7mm.

11. The combustion heat exchange assembly according to claim 8, characterized in that: The main air inlet (18) is arranged at the upper end of the outer shell, and the air outlet (110) is arranged at the lower end of the inner shell. The lower end of the outer shell is also provided with an auxiliary air inlet (120), and the auxiliary air inlet (120) and the air outlet (110) are staggered in the vertical direction, and the ventilation area of ​​the auxiliary air inlet (120) is smaller than the ventilation area of ​​the main air inlet (18).

12. The combustion heat exchange assembly according to claim 8, characterized in that: The upper end of the outer shell is integrally formed with the insertion positioning portion (15).

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