Heat exchange module and condensing gas water heater

Abstract

The utility model belongs to the technical field of heat supply, specifically discloses a heat exchange module and condensing gas hot -water equipment. Heat exchange module includes casing, flue gas distribution board, main heat exchanger and condensing heat exchanger. The casing includes the main heat exchange cavity and condensing heat exchange cavity who sets up up and down, is provided with the flue gas import with main heat exchange cavity intercommunication on the upper end of casing, is provided with the flue gas export with condensing heat exchange cavity intercommunication in lower part;Flue gas distribution board sets up between main heat exchange cavity and condensing heat exchange cavity and is opened with a plurality of flue gas through hole, and flue gas through hole intercommunication main heat exchange cavity and condensing heat exchange cavity;Main heat exchanger sets up in main heat exchange cavity and water outlet port and heat exchange water outlet intercommunication;Condensing heat exchanger sets up in condensing heat exchange cavity, and the water inlet port of condensing heat exchanger and heat exchange water inlet intercommunication, and water outlet port and main heat exchanger's water inlet port intercommunication. The utility model can promote flue gas and heat exchange module's heat exchange efficiency, promote the heat utilization rate to flue gas, promote the efficiency of condensing gas hot -water equipment.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to a heat exchange module and a condensing gas-fired hot water equipment. Background Technology

[0002] Gas water heaters, gas boilers, and other gas-fired water heating equipment all use high-temperature flue gas generated by gas combustion to heat water and obtain hot water. In order to improve the thermal efficiency of gas water heating equipment, condensing gas water heating equipment that can utilize the waste heat after heat exchange of high-temperature flue gas to preheat the water entering the main heat exchanger is becoming increasingly widely used.

[0003] Existing technology provides an inverted condensing water heater, which includes a fan, burner, heat exchanger, fume hood, and condenser arranged sequentially from top to bottom. A cold water pipe is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the hot water pipe. The high-temperature flue gas generated by combustion flows sequentially through the heat exchanger, fume hood, and condenser under the action of the fan. This allows the high-temperature flue gas to first exchange temperature with the heat exchanger, and then be cooled. The cooled flue gas is then condensed and cooled again in the condenser, simultaneously preheating the water inside the condenser.

[0004] Existing condensing water heaters utilize a top-down flue gas flow system, placing the heat exchanger above the condenser and ensuring the flue gas flows in the same direction as the condensate. This prevents condensate from dripping onto the main heat exchanger and burner, thus extending the water heater's lifespan. However, in existing condensing water heaters, the flue gas flows downwards through the heat exchanger and directly to the condenser before exiting through the flue gas outlet. This design makes it difficult to effectively improve heat exchange efficiency, thus impacting the energy efficiency of the condensing water heater. Utility Model Content

[0005] The first technical problem solved by this invention is to provide a heat exchange module that can improve heat exchange efficiency.

[0006] The second technical problem solved by this utility model is to provide a condensing gas-fired water heater that can improve the heat exchange efficiency with flue gas and improve the energy efficiency of the condensing gas-fired water heater.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A heat exchange module, comprising:

[0009] The housing includes a main heat exchange chamber and a condensation heat exchange chamber arranged side by side. The upper end of the housing is provided with a flue gas inlet communicating with the main heat exchange chamber, and the lower part of the housing is provided with a flue gas outlet communicating with the condensation heat exchange chamber. The housing is also provided with a heat exchange water inlet and a heat exchange water outlet.

[0010] A flue gas distribution plate is disposed between the main heat exchange chamber and the condensation heat exchange chamber. The flue gas distribution plate has multiple flue gas through holes, which connect the main heat exchange chamber and the condensation heat exchange chamber.

[0011] A main heat exchanger is disposed in the main heat exchange chamber, and the water outlet of the main heat exchanger is connected to the heat exchange outlet.

[0012] A condensing heat exchanger is disposed in the condensing heat exchange chamber. The water inlet port of the condensing heat exchanger is connected to the heat exchange water inlet, and the water outlet port of the condensing heat exchanger is connected to the water inlet port of the main heat exchanger.

[0013] Compared with the prior art, the heat exchange module of this utility model has the following advantages: By installing both the main heat exchanger and the condensing heat exchanger inside the shell, the main heat exchange structure and the condensing heat exchange structure can be integrated into a single structure, realizing the modular setting of the heat exchange module and effectively improving the disassembly, assembly, and maintenance efficiency of the heat exchange module; by setting a flue gas distribution plate between the main heat exchange chamber and the condensing heat exchange chamber, and setting multiple flue gas through holes on the flue gas distribution plate, the flue gas flow path and direction in the main heat exchange chamber and the condensing heat exchange chamber can be designed through the arrangement of the flue gas through holes, thereby improving the heat exchange efficiency between the flue gas and the water flowing through the heat exchange module and improving the heat exchange effect; furthermore, by setting a flue gas distribution plate, the resistance of flue gas flowing from the main heat exchange chamber to the condensing heat exchange chamber can be increased, thereby increasing the residence time of high-temperature flue gas in the main heat exchange chamber, thereby improving the heat exchange effect between high-temperature flue gas and the main heat exchanger, improving the heat utilization rate of flue gas, and thus improving the overall heat exchange effect of the heat exchange module.

[0014] In one embodiment, the housing has a first side and a second side disposed opposite to each other in the front-rear direction. The first side has the flue gas outlet. The flue gas distribution plate is connected to the housing on opposite sides in the left-right direction. The flue gas distribution plate abuts against the first side and is spaced apart from the second side.

[0015] In one embodiment, the flue gas distribution plate is provided with a plurality of hole groups at intervals along the front-back direction, and each hole group includes a plurality of flue gas through holes at intervals along the left-right direction;

[0016] The total ventilation area of ​​the hole group gradually increases in the direction away from the first side, and / or the spacing between two adjacent hole groups in the front-back direction gradually increases in the direction toward the first side.

[0017] In one embodiment, the flue gas distribution plate has a first open area, a non-open area, and a second open area arranged side by side from the first side to the second side. The first open area is provided with one group of holes or multiple groups of holes spaced apart along the front-back direction. The second open area is provided with multiple groups of holes spaced apart along the front-back direction. The number of groups of holes in the second open area is greater than the number of groups of holes in the first open area. The length of the non-open area in the front-back direction is greater than twice the length of the first open area in the front-back direction.

[0018] In one embodiment, the length of the condensation heat exchange chamber in the front-to-back direction is L1, and the length of the flue gas distribution plate in the front-to-back direction is L2, where 0.5L1 < L2 ≤ 0.8L1.

[0019] In one embodiment, the front-back direction is the front-back direction, and the flue gas outlet is provided on the rear side of the housing; and / or, the flue gas outlet is an elongated hole extending along the left-right direction.

[0020] In one embodiment, the condensing heat exchanger has a plurality of condensing heat exchange tubes extending along the left and right directions, and the flue gas distribution plate has downwardly folded fixing lugs at both ends along the left and right directions. The fixing lugs are provided with mounting holes, and the mounting holes are inserted into the condensing heat exchange tubes.

[0021] And / or, three sides of the flue gas distribution plate abut against the inner wall of the housing.

[0022] In one embodiment, the main heat exchanger includes heat exchange plates stacked in a left-right direction and a plurality of main heat exchange tubes passing through all the heat exchange plates. The left and right sides of the shell are provided with a plurality of upper water passages. Both ends of each main heat exchange tube are connected to the upper water passage, so that the channels in the plurality of main heat exchange tubes are connected in series through the upper water passage to form a main hot water circuit. The upper water passage located at the uppermost end of the main hot water circuit is connected to the outlet port of the condenser heat exchanger, and the upper water passage located at the lowermost end of the main hot water circuit is connected to the heat exchange outlet.

[0023] And / or, the condensing heat exchanger includes multiple heat exchange units arranged side by side, each heat exchange unit including one or more condensing heat exchange tubes extending in the left-right direction, multiple lower water passages are provided on both the left and right sides of the shell, the corresponding ends of all the condensing heat exchange tubes of the same heat exchange unit are connected to the same lower water passage to form a heat exchange branch water passage, one of the left and right ends of two adjacent heat exchange units is connected to the same lower water passage, and the other is connected to a different lower water passage, so that all the heat exchange branch water passages are connected in series to form a condensing hot water passage, the uppermost lower water passage of the condensing hot water passage is connected to the heat exchange outlet, and the lower water passage of the lower downstream of the condensing hot water passage is connected to the inlet port of the main heat exchanger.

[0024] In one embodiment, the housing includes:

[0025] The bottom shell includes a bottom plate and side walls surrounding the periphery of the bottom plate. The bottom shell forms the condensing heat exchange cavity. The condensing heat exchanger is installed inside the bottom shell, and both ends of all the condensing heat exchange tubes pass through the side walls respectively.

[0026] There are two shell side plates, spaced apart front and back, and the lower ends of the two shell side plates are respectively connected to the upper ends of the front and back side walls;

[0027] An end seal is provided on each of the left and right outer sides of the bottom shell and extends upward to connect with the upper end of the shell side plate. The upper part of the two end seals and the two shell side plates surround to form the main heat exchange cavity. Each end seal is provided with an upper water passage cavity and a lower water passage cavity.

[0028] In one embodiment, the side wall of the shell side plate is recessed in the direction toward the interior of the shell, so that the length of the condensation heat exchange cavity in the front-to-back direction is greater than the length of the main heat exchange cavity in the front-to-back direction, and the front and rear sides of the heat exchange plate abut against the shell side plate respectively.

[0029] In one embodiment, the bottom of the housing is recessed with a water collection groove, and the bottom of the water collection groove is provided with a drain outlet;

[0030] And / or, guide ramps are provided on both the front and rear sides of the upper end of the housing, and the guide ramps are inclined from top to bottom toward the interior of the housing;

[0031] And / or, the heat exchange inlet and the heat exchange outlet are located on one side of the housing in the left-right direction.

[0032] The second technical problem mentioned above is solved by the following technical solution:

[0033] A condensing gas-fired water heater includes a heat exchange module as described above.

[0034] Compared with the prior art, the condensing gas-fired water heater of this utility model has the following advantages: by adopting the above-mentioned heat exchange module, the heat exchange efficiency between the flue gas and the heat exchange module can be improved, thereby improving the utilization rate of the heat of the high-temperature flue gas and improving the heat exchange efficiency of the heat exchange module. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the heat exchange module provided in the embodiment of this utility model;

[0036] Figure 2 A cross-sectional view of the heat exchange module provided in an embodiment of this utility model;

[0037] Figure 3 This is a schematic diagram of the disassembled structure of the heat exchange module provided in an embodiment of the present utility model;

[0038] Figure 4 A schematic diagram of the heat exchange module provided in this embodiment of the present utility model after removing the main heat exchanger and the condensing heat exchanger;

[0039] Figure 5 A cross-sectional view of a portion of the structure of the heat exchange module provided in an embodiment of this utility model;

[0040] Figure 6 This is a schematic diagram of the structure of the flue gas distribution plate provided in an embodiment of the present utility model;

[0041] Figure 7 A cross-sectional view of a portion of the heat exchange module provided in an embodiment of this utility model, taken from another section.

[0042] Figure 8 for Figure 7 A partial structural diagram of the middle structure;

[0043] Figure 9 This is a schematic diagram of the disassembled structure of the end cap provided in an embodiment of the present utility model.

[0044] Label Explanation:

[0045] 1. Shell; 1a. First side; 1b. Second side; 11. Bottom shell; 111. Shell bottom plate; 1111. Water collection groove; 1112. Drain outlet; 112. Side wall; 112a. First side wall; 112a1. Flue gas outlet; 112b. Second side wall; 112b1. Pipe insertion hole; 12. End seal; 121. Inner mounting plate; 1211. Mounting plate part; 1212. Side flange part; 1213. Upper protruding ring part; 1214. Lower protruding ring part; 1215. Upper insertion hole; 122. Water seal plate; 1221. Sealing plate part; 12 22. Upper positioning recess; 1223. Lower positioning recess; 1224. Upper mating ring; 1225. Lower mating ring; 123. Upper cover; 124. Lower cover; 125. Upper water passage cavity; 126. Lower water passage cavity; 13. Shell side plate; 131. Main side plate; 132. Guide plate; 133. Lower bend; 134. Lower flange; 135. Upper fold plate; 14. Flue gas inlet; 15. Water inlet connector; 151. Heat exchanger water inlet; 16. Water outlet connector; 161. Heat exchanger water outlet; 17. Main heat exchanger cavity; 18. Condensation heat exchanger cavity;

[0046] 2. Main heat exchanger; 21. Heat exchange fins; 22. Main heat exchange tubes; 23. Fluid turbulence components;

[0047] 3. Condensing heat exchanger; 31. Condensing heat exchange tube;

[0048] 4. Flue gas distribution plate; 41. Distribution main plate; 411. Flue gas passage hole; 42. Fixing ear plate; 421. Mounting hole; 43. Side folded edge;

[0049] 5. Drain pipe; 6. Fixing bracket. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0051] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "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 device 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.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] This embodiment provides a heat exchange module and a condensing gas water heater including the heat exchange module to improve heat exchange efficiency and thus improve the thermal efficiency of the condensing gas water heater.

[0055] like Figures 1 to 3 As shown, the heat exchange module includes a shell 1, a flue gas distribution plate 4, a main heat exchanger 2, and a condensing heat exchanger 3. The shell 1 has a main heat exchange chamber 17 and a condensing heat exchange chamber 18 arranged vertically. The upper end of the shell 1 is provided with a flue gas inlet 14 communicating with the main heat exchange chamber 17, and the lower part of the shell 1 is provided with a flue gas outlet 112a1 communicating with the condensing heat exchange chamber 18. The shell 1 is provided with a heat exchange water inlet 151 and a heat exchange water outlet 161. A flue gas distribution plate 4 is provided between the main heat exchange chamber 17 and the condensing heat exchange chamber 18. The flue gas distribution plate 4 is provided with a plurality of flue gas through holes 411, which communicate with the main heat exchange chamber 17 and the condensing heat exchange chamber 18. The main heat exchanger 2 is provided in the main heat exchange chamber 17, and the water outlet of the main heat exchanger 2 is connected to the heat exchange water outlet 161. The condensing heat exchanger 3 is provided in the condensing heat exchange chamber 18. The water inlet of the condensing heat exchanger 3 is connected to the heat exchange water inlet 151, and the water outlet of the condensing heat exchanger 3 is connected to the water inlet of the main heat exchanger 2.

[0056] The condensing gas-fired water heater includes a casing, a combustion module, a heat exchange module, an air supply module, a flue gas exhaust module, cold water pipes, hot water pipes, and a controller. The combustion module, heat exchange module, and air supply module are all installed inside the casing, with the heat exchange module located below the combustion module. The combustion module generates high-temperature flue gas through gas combustion. The flue gas outlet of the combustion module is vertically connected to the flue gas inlet 14, and the flue gas outlet 112a1 of the heat exchange module is connected to the flue gas exhaust channel inside the exhaust module. The air supply module guides the high-temperature flue gas generated by combustion from top to bottom through the main heat exchanger 2, the flue gas distribution plate 4, and the condensing heat exchanger 3. The heat exchange inlet 151 connects to the cold water pipe, and the heat exchange outlet 161 connects to the hot water pipe. Both the combustion module and the air supply module are communicatively connected to the controller to control the operation of the condensing gas-fired water heater.

[0057] The heat exchange module provided in this embodiment integrates the main heat exchanger 2 and the condensing heat exchanger 3 into a single unit by installing both within the housing 1. This modular design effectively improves the efficiency of disassembly, assembly, and maintenance. Furthermore, a flue gas distribution plate 4 is provided between the main heat exchange chamber 17 and the condensing heat exchange chamber 18. Multiple flue gas through-holes 411 are provided on the flue gas distribution plate 4. The arrangement of these through-holes 411 facilitates the flow of gas through the main heat exchange chamber 17. The flow path and direction of flue gas in the main heat exchange chamber 17 and the condensing heat exchange chamber 18 are designed to improve the heat exchange efficiency between the flue gas and the water flowing through the heat exchange module, thereby enhancing the heat exchange effect. Furthermore, by setting the flue gas distribution plate 4, the resistance of the flue gas flowing from the main heat exchange chamber 17 to the condensing heat exchange chamber 18 can be increased, thereby increasing the residence time of the high-temperature flue gas in the main heat exchange chamber 17, thus improving the heat exchange effect between the high-temperature flue gas and the main heat exchanger 2, improving the heat utilization rate of the flue gas, and thus improving the overall heat exchange effect of the heat exchange module.

[0058] The condensing gas-fired water heater provided in this embodiment, by adopting the above-mentioned heat exchange module, can improve the heat exchange efficiency between the flue gas and the heat exchange module, thereby improving the utilization rate of the heat of the high-temperature flue gas and improving the heat exchange efficiency of the heat exchange module.

[0059] It is worth noting that in this embodiment, the structure of the condensing gas water heater, except for the heat exchange module, can be set using the structure in the prior art. This is not the focus of this utility model. This utility model only introduces the specific structure of the heat exchange module.

[0060] like Figures 2 to 6As shown, in one embodiment, the housing 1 has a first side 1a and a second side 1b arranged opposite to each other in the front-rear direction. A flue gas outlet 112a1 is provided on the first side 1a. The flue gas distribution plate 4 is connected to the housing 1 on opposite sides in the left-right direction. The flue gas distribution plate 4 abuts against the first side 1a and is spaced apart from the second side 1b. By spaced apart from the second side 1b, a flue gas communication port is formed between the flue gas distribution plate 4 and the second side 1b. This allows more flue gas flowing out of the main heat exchange chamber 17 to flow into the condensing heat exchange chamber 18 through the flue gas communication port. In other words, more flue gas flows into the condensing heat exchange chamber 18 from the side away from the flue gas outlet 112a1. This extends the flow path of the flue gas in the condensing heat exchange chamber 18, reduces the amount of flue gas entering the condensing heat exchange chamber 18 that flows directly out of the flue gas outlet 112a1, and improves the heat exchange effect between the flue gas and the condensing heat exchanger 3 in the condensing heat exchange chamber 18, thereby increasing the utilization rate of flue gas heat.

[0061] In one embodiment, a flue gas outlet 112a1 is provided on the rear side of the housing 1, thereby enabling the exhaust module to be located on the rear side of the heat exchange module when the heat exchange module is applied in a condensing gas water heater, thus improving the structural compactness of the condensing gas water heater.

[0062] To further improve heat exchange efficiency, in one embodiment, the flue gas distribution plate 4 is provided with multiple groups of holes spaced apart along the front-back direction. Each group of holes includes multiple flue gas through holes 411 spaced apart along the left-right direction. The total ventilation area of ​​the group of holes gradually increases in the direction away from the first side 1a, and / or the spacing between two adjacent groups of holes in the front-back direction gradually increases in the direction towards the first side 1a. This arrangement makes the resistance of flue gas flowing out of the main heat exchange chamber 17 from the side away from the flue gas outlet 112a1 into the condensing heat exchange chamber 18 less than the resistance from the side closer to the flue gas outlet 112a1 into the condensing heat exchange chamber 18. This allows most of the flue gas to enter the condensing heat exchange chamber 18 from the side away from the flue gas outlet 112a1, further increasing the contact area between the flue gas and the condensing heat exchanger 3 and improving the heat exchange effect between the flue gas and the condensing heat exchanger 3.

[0063] To reduce processing difficulty, the flue gas through-holes 411 in the same hole group are of the same size to facilitate processing. The ventilation area of ​​a single flue gas through-hole 411 in each hole group gradually decreases along the direction towards the first side 1a, thereby allowing adjustment of the total ventilation area of ​​the hole group while maintaining the same number of openings in each hole group, improving the ease of setting the flue gas through-holes 411. In other embodiments, all flue gas through-holes 411 may have the same shape and size, and the number of flue gas through-holes 411 in each hole group may gradually decrease along the direction towards the first side 1a, that is, the total ventilation area of ​​the hole group can be adjusted by controlling the number of flue gas through-holes 411 in each hole group.

[0064] In one embodiment, the flue gas passage 411 is a circular hole to reduce manufacturing difficulty. The largest flue gas passage 411 has a diameter of 2mm to 5mm, and the smallest flue gas passage 411 has a diameter of 1mm to 3mm. In other embodiments, the flue gas passage 411 can be a rectangular hole, an elliptical hole, or a hole of other shapes.

[0065] To further improve heat exchange efficiency, in one embodiment, the flue gas distribution plate 4 has a first open area, a non-open area, and a second open area arranged side by side from the first side 1a to the second side 1b. The first open area is provided with one group of holes or multiple groups of holes spaced apart along the front-back direction. The second open area is provided with multiple groups of holes spaced apart along the front-back direction. The number of groups of holes in the second open area is greater than the number of groups of holes in the first open area. The length of the non-open area in the front-back direction is greater than twice the length of the first open area in the front-back direction. By setting a non-perforated area, most of the flue gas through holes 411 on the flue gas distribution plate 4 are concentrated in the second perforated area far from the flue gas outlet 112a1. This effectively reduces the opening density of the flue gas through holes 411 on the side of the flue gas distribution plate closest to the flue gas outlet 112a1, thereby reducing the amount of flue gas entering the condensing heat exchange chamber 18 from the side closest to the flue gas outlet 112a1. This extends the flow path of the flue gas in the condensing heat exchange chamber 18 and improves the flue gas heat exchange efficiency. At the same time, by setting a first perforated area, it is possible to avoid the accumulation of flue gas in the main heat exchange chamber 17 and near the first side 1a, which could lead to local overheating. This improves the heat exchange reliability of the heat exchange module and extends its service life.

[0066] In one embodiment, a group of holes is provided in the first opening region, and the number of flue gas through holes 411 in the group of holes is less than the number of flue gas through holes 411 in the group of holes in the second opening region. The ratio of the length of the second opening region to the length of the non-opening region in the front-back direction is 0.7 to 1.5.

[0067] In one embodiment, the length of the condensation heat exchange chamber 18 in the front-to-back direction is L1, and the length of the flue gas distribution plate 4 in the front-to-back direction is L2, where 0.5L1 < L2 ≤ 0.8L1. This arrangement allows the flue gas distribution plate 4 to increase the probability of blocking the direct downward flow of flue gas, while also better ensuring that most of the flue gas flows directly into the condensation heat exchange chamber 18 from the gap between the flue gas distribution plate 4 and the second side 1b.

[0068] To improve flue gas exhaust flow, the flue gas outlet 112a1 is an elongated opening extending in the left-right direction to avoid reduced heat exchange efficiency due to poor exhaust. The ratio of the length of the flue gas outlet 112a1 in the left-right direction to the length of the condensation heat exchange chamber 18 in the left-right direction is 0.7~1.5.

[0069] To improve the ease of installation of the flue gas distribution plate 4, in one embodiment, the condensing heat exchanger 3 has multiple condensing heat exchange tubes 31 extending in the left-right direction. The flue gas distribution plate 4 has downwardly folded fixing lugs 42 at both ends in the left-right direction. The fixing lugs 42 have mounting holes 421 that are inserted into the condensing heat exchange tubes 31. This arrangement allows the flue gas distribution plate 4 to be connected to the condensing heat exchanger 3 via the fixing lugs 42 with mounting holes 421, achieving proper installation positioning and limiting of the flue gas distribution plate 4 and the condensing heat exchanger 3. Furthermore, it eliminates the need for other fastening structures to secure the flue gas distribution plate 4, effectively improving the ease of installation, simplifying the structure of the heat exchange module, and reducing the assembly difficulty of the heat exchange module. Specifically, the flue gas distribution plate 4 includes a main distribution plate 41, with fixing lugs 42 protruding downwards on opposite sides in the left-right direction.

[0070] In one embodiment, the flue gas distribution plate 4 has three sides that abut against the inner wall of the housing 1, thereby enabling better installation and positioning of the flue gas distribution plate 4 within the housing 1, preventing the flue gas distribution plate 4 from moving, and improving the ease of installation of the flue gas distribution plate 4.

[0071] Furthermore, the flue gas distribution plate 4 abuts against the inner wall of the housing 1 on both sides in the left-right direction and on the side closest to the first side 1a. Combined with the fixing lugs 42 and the condenser heat exchange tube 31, this effectively ensures the stable installation of the flue gas distribution plate 4 inside the housing 1, guaranteeing the stability of its installation. Two fixing lugs 42 are provided on each side of the flue gas distribution plate 4 in the left-right direction, located at opposite ends in the front-back direction, further enhancing the stability of the flue gas distribution plate 4.

[0072] In other embodiments, the flue gas distribution plate 4 is provided with fixed ear plates 42 at both ends in the left-right direction, and the fixed ear plates 42 are connected to the housing 1 by a fastening structure.

[0073] In one embodiment, the four sides of the main distribution plate 41 are folded downwards with side folded edges 43, and the side folded edges 43 on opposite sides in the left-right direction partially extend downwards with fixing ear plates 42. The side folded edges 43 opposite to the second side 1b are spaced apart from the second side 1b, and the remaining side folded edges 43 are all attached to the inner wall of the housing 1, so as to further improve the stability and reliability of the flue gas distribution plate 4 inside the housing 1, and at the same time enhance the overall structural strength and rigidity of the flue gas distribution plate 4.

[0074] In one embodiment, the main heat exchanger 2 includes a plurality of heat exchange plates 21 stacked in the left-right direction and a plurality of main heat exchange tubes 22 passing through the heat exchange plates 21 in the left-right direction. A plurality of upper water passages 125 are provided on both the left and right sides of the shell 1. The two ends of each main heat exchange tube 22 are respectively connected to two upper water passages 125. One of the left and right ends of two adjacent main heat exchange tubes 22 is connected to the same upper water passage 125, and the other is connected to different upper water passages 125 respectively, so that the plurality of main heat exchange tubes 22 are connected in series to form a main hot water circuit. The upper water passage 125 located at the uppermost end of the main hot water circuit is connected to the outlet port of the condenser heat exchanger 3, and the upper water passage 125 located at the lowermost end of the main hot water circuit is connected to the heat exchange outlet 161. The main heat exchanger 2 is a finned heat exchanger to increase the contact area between the main heat exchanger 2 and the high-temperature flue gas and improve the heat exchange efficiency. At the same time, water passage cavities 125 are provided on the left and right sides of the shell 1, so that the shell 1 of the heat exchange module is integrated with the end plate structure of the conventional main heat exchanger 2, which effectively simplifies the structure of the heat exchange module, reduces the footprint of the heat exchange module, and improves the structural compactness of the heat exchange module.

[0075] like Figure 2 , Figure 3 and Figure 7 As shown, in another embodiment, the main heat exchanger 2 includes heat exchange plates 21, main heat exchange tubes 22, and two end-sealing assemblies arranged opposite each other. Multiple heat exchange plates 21 are stacked between the two end-sealing assemblies, and each end-sealing assembly has an upper water passage cavity 125 communicating with the main heat exchange tube 22. In another embodiment, adjacent main heat exchange tubes 22 are connected by a bent pipe section, so that multiple main heat exchange tubes 22 are connected in series to form a serpentine tubular structure, thus eliminating the need to provide upper water passage cavities 125 on the left and right sides of the shell 1.

[0076] In one embodiment, multiple main heat exchange tubes 22 are arranged side-by-side along the front-to-back direction to improve the regularity of the arrangement of the main heat exchange tubes 22. The cross-sectional shape of the main heat exchange tubes 22 is a racetrack shape extending vertically to increase the water flow rate within the main heat exchange tubes 22 and improve heat exchange efficiency. In one embodiment, each main heat exchange tube 22 is provided with a baffle 23 to enhance the heat exchange efficiency between the water and the main heat exchange tube 22.

[0077] However, it is understandable that the structure of the heat exchange plate 21, the main heat exchange tube 22, and the turbulence-disrupting element 23 in the main heat exchanger 2, as well as their mutual cooperation structure, can adopt any existing structure in the main heat exchanger 2. For example, the main heat exchange tube 22 can be a round tube or an elliptical tube and can be arranged in multiple layers in the vertical direction. This utility model does not limit or elaborate on the specific structure of the main heat exchanger 2.

[0078] In one embodiment, the condensing heat exchanger 3 includes multiple heat exchange units arranged side by side. Each heat exchange unit includes one or more condensing heat exchange tubes 31 extending in the left-right direction. Multiple lower water passages 126 are provided on both the left and right sides of the shell 1. The corresponding ends of all condensing heat exchange tubes 31 in the same heat exchange unit are connected to the same lower water passage 126 to form a heat exchange branch water passage. One of the left and right ends of two adjacent heat exchange units is connected to the same lower water passage 126, and the other is connected to a different lower water passage 126, so that all heat exchange branch water passages are connected in series to form a condensing hot water passage. The uppermost lower water passage 126 of the condensing hot water passage is connected to the heat exchange outlet 161, and the lowermost lower water passage 126 of the condensing hot water passage is connected to the inlet port of the main heat exchanger 2. This configuration facilitates the assembly and disassembly of the heat exchange unit relative to the shell 1, improving the overall assembly and disassembly performance of the heat exchange module. Simultaneously, this configuration integrates the left and right sides of the shell 1 with the end plate structure of the conventional condensing heat exchanger 3, effectively simplifying the structure of the heat exchange module, improving its structural compactness, and reducing its footprint. Furthermore, the configuration of the heat exchange unit allows for an increase in the number of condensing heat exchange tubes 31 to enhance heat exchange efficiency while reducing the number of lower water passages 126, thereby simplifying the structure of the shell 1 and reducing the processing costs of the shell 1 and the heat exchange module.

[0079] In other embodiments, the condenser heat exchanger 3 may include a plurality of condenser heat exchange tubes 31 extending in the left-right direction, and the plurality of condenser heat exchange tubes 31 are connected in series end to end to form a condenser heat exchange circuit.

[0080] For example, each heat exchange unit includes multiple rows of heat exchange tube groups spaced apart in the front-to-back direction. Each heat exchange tube group includes one or more condensing heat exchange tubes 31 spaced apart in the vertical direction. The condensing heat exchange tubes 31 of adjacent rows of heat exchange tube groups are staggered in the vertical direction to facilitate the flow of flue gas between the condensing heat exchange tubes 31, increase the contact area between the flue gas and the condensing heat exchange tubes 31, and improve the flue gas condensation effect.

[0081] In one embodiment, both the main heat exchanger 2 and the condenser heat exchanger 3 are made of stainless steel to improve corrosion resistance, reduce the probability of pipe blockage and corrosion, and improve the long-term performance of the heat exchange module.

[0082] like Figure 2 , Figure 5 and Figure 7As shown, in one embodiment, the shell 1 includes a bottom shell 11, shell side plates 13, and end seals 12. The bottom shell 11 includes a bottom plate 111 and side walls 112 surrounding the periphery of the bottom plate 111. The bottom shell 11 forms a condensing heat exchange chamber 18. A condensing heat exchanger 3 is installed inside the bottom shell 11, and both ends of all condensing heat exchange tubes 31 pass through the side walls 112 respectively. Two shell side plates 13 are arranged at intervals, and the lower ends of the two shell side plates 13 are respectively connected to the upper ends of the two front and rear side walls 112. One end seal 12 is provided on each of the left and right outer sides of the bottom shell 11 and extends upward to connect with the upper end of the shell side plate 13. The upper part of the two end seals 12 and the two shell side plates 13 form a main heat exchange chamber 17. Each end seal 12 is provided with an upper water passage chamber 125 and a lower water passage chamber 126.

[0083] The structural design of this housing 1 allows for efficient assembly. First, the condensing heat exchange module is installed on the bottom shell 11. Then, the main heat exchanger 2 is connected to the two end seals 12. Next, the side plate 13 is connected to the bottom shell 11, and finally, the end seals 12 are connected to the bottom shell 11. This completes the assembly of the heat exchange module in the housing 1, improving assembly efficiency. Furthermore, this design ensures good sealing performance at the bottom of the condensing heat exchange chamber 18, effectively preventing condensate leakage and enhancing the safety of the heat exchange module.

[0084] Specifically, in the bottom shell 11, the side walls 112 located on the front and rear sides are the first side walls 112a, and the first side wall 112a located on the rear side has a flue gas outlet 112a1; the side walls 112 located on the left and right sides are the second side walls 112b, and the second side walls 112b have tube insertion holes 112b1, and the tube insertion holes 112b1 are arranged in a one-to-one correspondence with the condensing heat exchange tubes 31, and the condensing heat exchange tubes 31 are inserted into the tube insertion holes 112b1.

[0085] In one embodiment, the shell side plate 13 is recessed in the direction towards the interior of the shell 1 relative to the corresponding side wall 112, so that the length of the condensation heat exchange chamber 18 in the front-to-back direction is greater than the length of the main heat exchange chamber 17 in the front-to-back direction, and the front and rear sides of the heat exchange fins 21 abut against the shell side plate 13 respectively. This arrangement can better achieve the installation and positioning of the shell 1 and the main heat exchanger 2. In other embodiments, a heat insulation structure can be provided between the front and rear sides of the main heat exchanger 2 and the two shell side plates 13.

[0086] In one embodiment, guide ramps are provided on both the front and rear sides of the upper end of the shell 1, and the guide ramps slope downwards towards the interior of the shell 1. By providing guide ramps, the main heat exchanger 2 can be guided into the main heat exchange cavity 17, thereby improving assembly efficiency. Specifically, guide ramps are provided on the shell side plate 13.

[0087] To improve the ease of installation of the shell side plate 13, the shell side plate 13 includes a vertically arranged main side plate portion 131. The upper end of the main side plate portion 131 is connected to an upwardly and outwardly inclined guide plate portion 132, and the inner side of the guide plate portion 132 forms a guide slope. The upper end of the guide plate portion 132 is folded outward to form an upper bend portion, and the outer end of the upper bend portion is folded downward to form an upper fold plate portion 135, so as to facilitate the assembly of the shell 1 in the condensing gas water heater. The lower end of the main side plate portion 131 is folded outward to form a lower bend portion 133, which abuts against the upper end of the side wall 112 to achieve vertical installation positioning; the outer side of the lower bend portion 133 is folded downward to form a lower flange portion 134, which fits against the outer side wall of the side wall 112 to achieve installation positioning of the bottom shell 11 and the shell side plate 13 in the front-rear direction. Both sides of the shell side plate 13 abut against the end seal 12 to achieve assembly positioning and limiting in the left and right directions.

[0088] like Figure 2 , Figure 8 and Figure 9 As shown, in one embodiment, the end seal 12 includes an inner mounting plate 121, a water seal plate 122, an upper cover 123, and a lower cover 124. The inner mounting plate 121 is connected to the side wall 112 and the two shell side plates 13. The ends of the main heat exchange tube 22 and the condenser heat exchange tube 31 are both inserted through the inner mounting plate 121. The water seal plate 122 is disposed on the side of the inner mounting plate 121 away from the main heat exchanger 2. The upper cover 123 and the lower cover 124 are both installed on the side of the water seal plate 122 away from the inner mounting plate 121. The upper cover 123 and the water seal plate 122 form an upper water passage cavity 125, and the lower cover 124 and the water seal plate 122 form a lower water passage cavity 126. The upper cover 123 and the upper water passage cavity 125 are arranged in a one-to-one correspondence, and the lower cover 124 and the lower water passage cavity 126 are arranged in a one-to-one correspondence. This improves the ease of connection between the end seal 12 and the condensing heat exchanger 3, and increases assembly efficiency.

[0089] Furthermore, the inner mounting plate 121 includes a mounting plate portion 1211. The mounting plate portion 1211 has an upper insertion hole 1215 corresponding to each main heat exchange tube 22 and a lower insertion hole corresponding to each condensing heat exchange tube 31. The main heat exchange tube 22 is inserted into the upper insertion hole 1215, and the condensing heat exchange tube 31 is inserted into the lower insertion hole. The mounting plate portion 1211 has an upper protruding ring portion 1213 protruding around each upper insertion hole 1215 to increase the contact area between the inner mounting plate 121 and the main heat exchange tube 22; the mounting plate portion 1211 also has a lower protruding ring portion 1214 protruding around each lower insertion hole to increase the contact area between the inner mounting plate 121 and the condensing heat exchange tube 31. The left and right ends of the side wall 112 and the shell side plate 13 respectively abut against two mounting plate portions 1211. The front and rear sides and the top and bottom sides of the mounting plate portion 1211 are provided with side flange portions 1212 protruding in a direction away from the other inner mounting plate 121. The water seal plate 122 is located in the groove formed by the side flange portions 1212 and the mounting plate portions 1211. Furthermore, the upper convex ring portion 1213 and the lower convex ring portion 1214 both protrude from the side of the mounting plate portion 1211 away from the main heat exchange cavity 17.

[0090] The water seal plate 122 includes a sealing plate portion 1221. The sealing plate portion 1221 is recessed along the direction towards the inner mounting plate 121, forming an upper positioning recess 1222 and a lower positioning recess 1223. The upper cover 123 is inserted into the upper positioning recess 1222 and surrounds the upper positioning recess 1222 to form an upper water passage cavity 125. The upper positioning recess 1222, the upper water passage cavity 125, and the upper cover 123 are arranged in a one-to-one correspondence. The bottom of the upper positioning recess 1222 has an upper connecting opening corresponding to each upper insertion hole 1215. The lower cover 124 is inserted into the lower positioning recess 1223 and surrounds the lower positioning recess 1223 to form a lower water passage cavity 126. The lower positioning recess 1223, the lower water passage cavity 126, and the lower cover 124 are arranged in a one-to-one correspondence. The bottom of the lower positioning recess 1223 has a lower connecting opening corresponding to each lower insertion hole. By providing the upper positioning recess 1222, the installation of the upper cover 123 can be positioned, thus improving assembly efficiency; by providing the lower positioning recess 1223, the installation of the lower cover 124 can be positioned, thus improving assembly efficiency.

[0091] An upper positioning recess 1222 protrudes around each upper connecting port on the side facing the inner mounting plate 121, with an upper mating ring 1224 abutting against the upper convex ring 1213. This increases the contact area between the main heat exchange tube 22 and the water seal plate 122, improving assembly stability. A lower positioning recess 1223 protrudes around each lower connecting port on the side facing the inner mounting plate 121, with a lower mating ring 1225 abutting against the lower convex ring 1214. This increases the contact area between the water seal plate 122 and the condensing heat exchange tube 31, improving structural stability.

[0092] It is worth noting that the above-mentioned end seal 12 structure is only an exemplary configuration. Existing end seal 12 structures applicable to heat exchangers can all be applied to this utility model, and this utility model does not limit or elaborate on them.

[0093] In one embodiment, the outer wall of the downstream upper water passage 125 is connected to a water outlet connector 16, which has a heat exchange outlet 161 communicating with the upper water passage 125; and / or, the outer wall of the upstream lower water passage 126 is connected to a water inlet connector 15, which has a heat exchange inlet 151 communicating with the corresponding lower water passage 126. By providing the water inlet connector 15 and the water outlet connector 16, the convenience of connecting to cold water pipes and hot water pipes can be effectively improved. Specifically, the upper cover 123 of the downstream upper water passage 125 is connected to a water outlet connector 16, and the lower cover 124 of the upstream lower water passage 126 is connected to a water inlet connector 15.

[0094] In one embodiment, the bottom of the housing 1 is recessed with a water collection groove 1111, and the bottom of the water collection groove 1111 is provided with a drain outlet 1112 to facilitate the collection and discharge of condensate. A drain pipe 5 is connected to the drain outlet 1112 to facilitate the discharge of condensate.

[0095] In one embodiment, a fixed bracket 6 is connected to the bottom of the housing 1. Two fixed brackets 6 are spaced apart in the left-right direction to better realize the installation of the heat exchange module in the condensing gas water heater.

[0096] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0097] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A heat exchange module, characterized in that, include: The shell (1) includes a main heat exchange chamber (17) and a condensation heat exchange chamber (18) arranged side by side. The upper end of the shell (1) is provided with a flue gas inlet (14) communicating with the main heat exchange chamber (17). The lower part of the shell (1) is provided with a flue gas outlet (112a1) communicating with the condensation heat exchange chamber (18). The shell (1) is provided with a heat exchange water inlet (151) and a heat exchange water outlet (161). A flue gas distribution plate (4) is disposed between the main heat exchange chamber (17) and the condensation heat exchange chamber (18). The flue gas distribution plate (4) is provided with a plurality of flue gas through holes (411), which connect the main heat exchange chamber (17) and the condensation heat exchange chamber (18). The main heat exchanger (2) is located in the main heat exchange chamber (17), and the outlet port of the main heat exchanger (2) is connected to the heat exchange outlet (161); A condensing heat exchanger (3) is disposed in the condensing heat exchange chamber (18). The water inlet port of the condensing heat exchanger (3) is connected to the heat exchange water inlet (151), and the water outlet port of the condensing heat exchanger (3) is connected to the water inlet port of the main heat exchanger (2).

2. The heat exchange module according to claim 1, characterized in that, The housing (1) has a first side (1a) and a second side (1b) arranged opposite to each other in the front-rear direction. The first side (1a) is provided with the flue gas outlet (112a1). The flue gas distribution plate (4) is connected to the housing (1) on opposite sides in the left-right direction. The flue gas distribution plate (4) abuts against the first side (1a) and the flue gas distribution plate (4) is spaced apart from the second side (1b).

3. The heat exchange module according to claim 2, characterized in that, The flue gas distribution plate (4) is provided with a plurality of hole groups at intervals along the front-back direction, and each hole group includes a plurality of flue gas through holes (411) at intervals along the left-right direction. The total ventilation area of ​​the hole group gradually increases in the direction away from the first side (1a), and / or the spacing between two adjacent hole groups in the front-back direction gradually increases in the direction toward the first side (1a).

4. The heat exchange module according to claim 3, characterized in that, The flue gas distribution plate (4) has a first open area, a non-open area and a second open area arranged side by side from the first side (1a) to the second side (1b). The first open area is provided with one group of holes or multiple groups of holes are arranged at intervals along the front-back direction. The second open area is provided with multiple groups of holes at intervals along the front-back direction. The number of groups of holes in the second open area is greater than the number of groups of holes in the first open area. The length of the non-open area in the front-back direction is greater than twice the length of the first open area in the front-back direction.

5. The heat exchange module according to claim 2, characterized in that, The length of the condensation heat exchange chamber (18) in the front-to-back direction is L1, and the length of the flue gas distribution plate (4) in the front-to-back direction is L2, where 0.5L1 < L2 ≤ 0.8L1.

6. The heat exchange module according to any one of claims 2-5, characterized in that, The flue gas outlet (112a1) is provided on the rear side of the housing (1); and / or, the flue gas outlet (112a1) is an elongated hole extending along the left and right direction.

7. The heat exchange module according to any one of claims 1-5, characterized in that, The condenser heat exchanger (3) has multiple condenser heat exchange tubes (31) extending in the left and right direction. The flue gas distribution plate (4) has downward-folded fixed ear plates (42) at both ends in the left and right direction. The fixed ear plates (42) are provided with mounting holes (421), and the mounting holes (421) are inserted into the condenser heat exchange tubes (31). And / or, the three sides of the flue gas distribution plate (4) abut against the inner wall of the housing (1).

8. The heat exchange module according to any one of claims 1-5, characterized in that, The main heat exchanger (2) includes heat exchange plates (21) stacked in the left-right direction and a plurality of main heat exchange tubes (22) passing through all the heat exchange plates (21). The shell (1) is provided with a plurality of upper water passages (125) on both the left and right sides. Both ends of each main heat exchange tube (22) are connected to the upper water passage (125) so that the channels in the plurality of main heat exchange tubes (22) are connected in series through the upper water passage (125) to form a main heat exchange circuit. The upper water passage (125) located at the uppermost end of the main heat exchange circuit is connected to the outlet port of the condenser heat exchanger (3), and the upper water passage (125) located at the lowermost end of the main heat exchange circuit is connected to the heat exchange outlet (161). And / or, the condensing heat exchanger (3) includes multiple heat exchange units arranged side by side, each heat exchange unit includes one or more condensing heat exchange tubes (31) extending in the left and right direction, and multiple lower water passages (126) are provided on the left and right sides of the shell (1). The corresponding ends of all the condensing heat exchange tubes (31) of the same heat exchange unit are connected to the same lower water passage (126) to form a heat exchange branch water passage. One of the left and right ends of two adjacent heat exchange units is connected to the same lower water passage (126), and the other is connected to a different lower water passage (126) so that all the heat exchange branch water passages are connected in series to form a condensing hot water passage. The lower water passage (126) located at the uppermost end of the condensing hot water passage is connected to the heat exchange outlet (161), and the lower water passage (126) located at the lowermost end of the condensing hot water passage is connected to the water inlet port of the main heat exchanger (2).

9. The heat exchange module according to claim 8, characterized in that, The housing (1) includes: The bottom shell (11) includes a bottom plate (111) and a side wall (112) surrounding the periphery of the bottom plate (111). The bottom shell (11) forms the condensing heat exchange chamber (18). The condensing heat exchanger (3) is installed inside the bottom shell (11), and both ends of all the condensing heat exchange tubes (31) pass through the side wall (112). There are two shell side plates (13) spaced apart front and back, and the lower ends of the two shell side plates (13) are respectively connected to the upper ends of the front and rear side walls (112); An end seal (12) is provided on each of the left and right outer sides of the bottom shell (11) and extends upward to connect with the upper end of the shell side plate (13). The upper part of the two end seals (12) and the two shell side plates (13) surround to form the main heat exchange cavity (17). Each end seal (12) is provided with the upper water passage cavity (125) and the lower water passage cavity (126).

10. The heat exchange module according to claim 9, characterized in that, The shell side plate (13) is recessed in the direction toward the interior of the shell (1) relative to the side wall (112) on the corresponding side, so that the length of the condensation heat exchange chamber (18) in the front-to-back direction is greater than the length of the main heat exchange chamber (17) in the front-to-back direction, and the front and rear sides of the heat exchange plate (21) respectively abut against the shell side plate (13).

11. The heat exchange module according to any one of claims 1-5, characterized in that, The bottom of the shell (1) is recessed with a water collection groove (1111), and the bottom of the water collection groove (1111) is provided with a drain outlet (1112). And / or, the upper end of the housing (1) is provided with guide slopes on both the front and rear sides, and the guide slopes are inclined from top to bottom toward the interior of the housing (1); And / or, the heat exchange inlet (151) and the heat exchange outlet (161) are located on one side of the housing (1) in the left-right direction.

12. A condensing gas-fired hot water device, characterized in that, Includes the heat exchange module as described in any one of claims 1-11.

Images