Condensation heat exchange device and gas water heating equipment

Abstract

The invention belongs to the technical field of heat supply, and particularly discloses a condensation heat exchange device and gas water heating equipment. The condensation heat exchange device comprises a smoke gathering cover, a smoke guiding cylinder set and a condensation assembly. The smoke guiding cylinder set is installed at the upper end of the smoke gathering cover and comprises an inner cylinder part, a separation cylinder part and an outer cylinder part which are sequentially arranged at intervals in a sleeving mode from inside to outside, a smoke inlet cavity is formed in the inner side of the inner cylinder part, the inner cylinder part and the separation cylinder part define an inner ring smoke cavity, and the inner cylinder part and the separation cylinder part define an outer ring smoke cavity. The upper end of the inner-ring smoke cavity is communicated with the smoke inlet cavity, the lower end of the inner-ring smoke cavity is communicated with the outer-ring smoke cavity, a smoke outlet is formed in an opening in the upper end of the outer cylinder part, a plurality of ejection smoke holes communicated with the smoke outlet and the smoke inlet cavity are formed in the cavity wall of the upper end of the smoke inlet cavity, and / or a plurality of side smoke through holes communicated with the inner-ring smoke cavity and the outer-ring smoke cavity are formed in the separation cylinder part; the condensation assembly comprises two condensation pipes used for introducing cold water. The heat exchanger can ensure the heat exchange efficiency of the flue gas and the condensation pipe, reduce the flowing resistance of the flue gas and improve the flowing smoothness of the flue gas.

Description

Technical Field

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

[0002] A gas water heater typically consists of a burner, a main heat exchanger, and a flue hood, arranged from bottom to top. The high-temperature flue gas generated by the burner flows through the heat exchanger, exchanging heat with the water flowing through it, heating the water into hot water. The flue gas then cools down and is collected in the flue hood for discharge.

[0003] To improve the thermal efficiency of gas water heaters, existing technology provides a condensing heat exchange device, which includes a flue hood, a flue gas guide cylinder, a flue gas collection hood, and condenser tubes. The flue gas collection hood is positioned above the main heat exchanger to collect the flue gas flowing out from it. The flue gas guide cylinder is installed at the top of the flue gas collection hood and communicates with its inner cavity. The top of the flue gas guide cylinder is closed, and its lower end has a flue gas guide opening between it and the top of the flue gas collection hood. The flue gas exhaust hood is spaced around the outer wall of the flue gas guide cylinder, forming an annular flue gas flow channel. The lower end of the flue gas flow channel communicates with the flue gas guide opening, and its upper end is open to form a flue gas exhaust port. A condenser coil is spirally wound around the outside of the flue gas guide cylinder and located within the flue gas flow channel. The condenser tubes are connected in series upstream of the main heat exchanger.

[0004] In existing condensing heat exchange devices, the flue gas exiting the main heat exchanger flows through the flue gas hood into the inner flue gas guide cylinder. Because the upper end of the inner flue gas guide cylinder is closed and the bottom has a flue gas guide opening, the upward-flowing flue gas is guided by the inner flue gas guide cylinder to the flue gas guide opening and then flows into the flue gas flow channel. The flue gas entering the flue gas flow channel exchanges heat with the water in the condenser tubes, allowing the water in the condenser tubes to further absorb the residual heat from the flue gas, thereby improving heat utilization efficiency. However, in existing condensing heat exchange devices, because the exhaust port is located between the lower end of the inner flue gas guide cylinder and the flue gas hood, the upward-flowing flue gas can only be discharged sequentially through the exhaust port, the flue gas flow channel, and the exhaust port again. The flow resistance of the flue gas when it changes direction inside the inner flue gas guide cylinder to the flue gas flow channel is relatively large, affecting the smoothness of exhaust and also increasing abnormalities and noise during exhaust, thus affecting the user experience of the gas water heater. Summary of the Invention

[0005] One of the technical problems solved by this invention is to provide a condensing heat exchange device that can effectively solve the problems of high flue gas flow resistance and abnormal noise during flue gas exhaust in existing condensing heat exchange devices, while improving flue gas exhaust smoothness while ensuring heat exchange efficiency.

[0006] The second technical problem solved by this invention is to provide a gas-fired water heater that can effectively solve the problems of poor flue gas exhaust and obvious abnormal noise during flue gas exhaust in existing gas-fired water heaters, improve flue gas exhaust and reduce the noise during operation of the gas-fired water heater.

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

[0008] A condensation heat exchange device, comprising:

[0009] Smoke hood with a smoke collection chamber;

[0010] A smoke guide assembly is installed at the upper end of the smoke collection hood. The smoke guide assembly includes an inner cylinder, a partition cylinder, and an outer cylinder that are sequentially spaced from the inside to the outside. The inner cylinder has a smoke inlet chamber on its inner side, the lower end of which communicates with the smoke collection chamber. The inner cylinder and the partition cylinder form an inner annular smoke chamber. The inner cylinder and the outer cylinder together form an outer annular smoke chamber. The upper ends of the smoke inlet chamber and the inner annular smoke chamber are closed. The upper end of the inner annular smoke chamber communicates with the smoke inlet chamber and the lower end communicates with the outer annular smoke chamber. The upper end of the outer cylinder is open and has a smoke outlet. The upper wall of the smoke inlet chamber has multiple top smoke outlets that communicate with the smoke outlet and the smoke inlet chamber. And / or, the partition cylinder has multiple side smoke outlets that communicate with the inner annular smoke chamber and the outer annular smoke chamber.

[0011] The condensation assembly includes two condenser tubes respectively coiled in the inner ring smoke chamber and the outer ring smoke chamber, the condenser tubes being used to circulate cold water.

[0012] The condensing heat exchange device of the present invention has the following advantages compared with the prior art: Since the inlet chamber, inner ring chamber, and outer ring chamber are sequentially separated from the inside to the outside, at least a portion of the flue gas entering the smoke collection chamber flows upward to the top of the inlet chamber and then into the inner ring chamber. It then flows downward in the inner ring chamber until it enters the outer ring chamber, and then flows upward through the outer ring chamber to the exhaust port. This effectively prolongs the residence time of the flue gas inside the smoke guide tube assembly, thereby increasing the contact area and contact time between the flue gas and the condenser tubes in the inner and outer ring chambers, improving the heat exchange effect between the flue gas and the condensing components, and improving the condensing components' absorption of residual heat from the flue gas. Simultaneously, since the upper wall of the inlet chamber has a top-outlet smoke hole connecting the exhaust port and the inlet chamber, and / or the partition cylinder has multiple side-through smoke holes connecting the inner and outer ring chambers, a portion of the flue gas entering the inlet chamber can directly flow out through the top-outlet smoke hole to the exhaust port. At the flue gas outlet, and / or part of the flue gas entering the inner ring flue gas chamber can enter the outer ring flue gas chamber through the side flue gas holes without having to flow downwards to the bottom of the inner ring flue gas chamber and then change direction. This increases the flow path and residence time of some flue gas inside the flue gas guide tube assembly to improve heat exchange efficiency, while making the flow path of some flue gas inside the flue gas guide tube assembly relatively short. This better balances the smoothness of flue gas exhaust and the heat exchange effect between flue gas and condensing components, ensuring heat exchange effect while reducing flue gas exhaust resistance and improving flue gas exhaust smoothness. This reduces the probability of abnormalities caused by poor flue gas exhaust and improves the user experience of the condensing heat exchange device. Furthermore, when the partition cylinder has side flue gas holes, the flue gas flowing from the side flue gas holes to the outer ring flue gas chamber collides with the flue gas flowing from bottom to top in the outer ring flue gas chamber, which can further increase the residence time of some flue gas in the outer ring flue gas chamber and increase the contact time between the flue gas and the condensing tube in the outer ring flue gas chamber, further improving the heat exchange effect.

[0013] In one embodiment, the partition cylinder is provided with a plurality of smoke hole groups spaced apart in the vertical direction. Each smoke hole group includes a plurality of side smoke holes spaced apart in the circumferential direction of the partition cylinder. From bottom to top, the total ventilation area of ​​all the side smoke holes in the same smoke hole group gradually decreases.

[0014] In one embodiment, the upper sidewall of the inner cylinder is provided with a plurality of connecting ports, the inner annular smoke chamber is connected to the smoke inlet chamber through the connecting ports, the total ventilation area of ​​all the connecting ports is S1, the total ventilation area of ​​all the top smoke holes is S2, and S1≥5S2;

[0015] And / or, the smoke inlet chamber is a cylindrical cavity, and the exhaust smoke holes are arranged in multiple sets around the axis of the cylindrical cavity, each set of exhaust smoke holes including multiple exhaust smoke holes arranged radially at intervals along the cylindrical cavity.

[0016] In one embodiment, the top end of the partition cylinder is connected to a top plate, which abuts against the top end of the inner cylinder. The top plate closes the upper end of the inner annular smoke chamber and the upper end of the smoke inlet chamber, and the top plate has the exhaust smoke hole.

[0017] In one embodiment, a bottom plate is provided between the lower end of the inner cylinder and the lower end of the outer cylinder. The bottom plate closes the lower ends of the inner and outer annular smoke chambers. The lower end of the partition cylinder is higher than the bottom plate, and a connecting channel is formed between the lower end of the partition cylinder and the bottom plate, connecting the inner and outer annular smoke chambers.

[0018] In one embodiment, the condenser tube includes two bent and connected half-tube sections. Each half-tube section has multiple spiral tube sections spirally wound from top to bottom from the connection point of the two half-tube sections. The spiral tube sections of the two half-tube sections are staggered from top to bottom, and the end ports of the two lowest spiral tube sections respectively form a water inlet port and a water outlet port.

[0019] And / or, the condenser tube further includes an inlet pipe section and an outlet pipe section, the inlet ends of the two condenser tubes are connected to the inlet pipe section, the outlet ends of the two condenser tube sections are connected to the outlet pipe section, and the inlet pipe section and the outlet pipe section both extend out of the outer cylinder section.

[0020] In one embodiment, a bottom plate is connected between the lower end of the inner cylinder and the lower end of the outer cylinder, and the water inlet pipe and the water outlet pipe are both located between the lower end of the partition cylinder and the bottom plate.

[0021] In one embodiment, a bottom plate is connected between the lower end of the inner cylinder and the lower end of the outer cylinder, the lower end of the partition cylinder is higher than the bottom plate, and the inner cylinder, the outer cylinder and the bottom plate together form a water collection trough, which is connected to the lower ends of the outer annular smoke chamber and the inner annular smoke chamber.

[0022] The condensation heat exchanger also includes a drain connector, the first end of which is inserted into the water collection tank and the second end of which is sealed and protrudes from the outer cylinder. The second end of the drain connector is higher than the first end of the drain connector.

[0023] In one embodiment, the top of the smoke hood has a top through hole, the outer cylinder is inserted into the top through hole, and the periphery of the outer cylinder extends outward with a flange portion, which is attached to and connected to the inner wall of the smoke hood.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] A gas-fired hot water device includes a heat exchanger, the inlet end of which is connected to an inlet pipe, and a condensing heat exchange device as described above. A smoke hood is installed above the heat exchanger, and the two ends of the condensing pipe are connected in series to the inlet pipe.

[0026] Compared with the prior art, the gas-fired water heater of the present invention has the following advantages: by adopting the above-mentioned condensing heat exchange device, it is possible to ensure the condensing heat exchange effect with flue gas, reduce flue gas emission resistance, improve flue gas smoothness, reduce abnormalities or noise caused by poor flue gas emission, and improve the user experience of the gas-fired water heater. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the condensation heat exchange device provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the disassembled structure of the condensation heat exchange device provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the flue gas flow in the condensation heat exchange device provided in an embodiment of the present invention;

[0030] Figure 4 This is a partial structural cross-sectional view of the condensation heat exchange device provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the inner cylinder structure provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the intermediate cylinder provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the outer cylinder provided in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the water flow direction of the condensation heat exchange device provided in an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the condensation assembly provided in an embodiment of the present invention;

[0036] Figure 10 This is a cross-sectional view of the condensation heat exchange device provided in an embodiment of the present invention from another perspective.

[0037] Label Explanation:

[0038] 1. Smoke guide duct assembly; 11. Inner cylinder; 111. Inner cylinder section; 1111. Connecting port; 112. Abutting plate section; 113. Bottom plate section; 114. Smoke inlet chamber; 12. Intermediate cylinder; 121. Dividing cylinder section; 1211. Side smoke passage; 122. Top plate section; 1221. Top smoke outlet; 13. Outer cylinder; 131. Outer cylinder section; 1311. Smoke outlet; 1312. Clearance perforation; 1313. Drainage outlet; 132. Flange section; 14. Inner annular smoke chamber; 15. Outer annular smoke chamber; 16. Water collection trough;

[0039] 2. Smoke hood; 21. Main hood body; 211. Mounting plate; 212. Top through hole; 22. Mounting edge; 23. Smoke collection chamber;

[0040] 3. Condensation assembly; 31. Condensation tube; 31a. Inner condenser tube; 31b. Outer condenser tube; 311. Spiral tube section; 311a. Inlet spiral section; 311b. Outlet spiral section; 32. Inlet pipe section; 33. Outlet pipe section;

[0041] 4. Sealing components; 5. Drainage connectors. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "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 application 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 application.

[0044] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] This embodiment provides a condensing heat exchange device that can be applied to gas-fired water heating equipment to absorb and utilize the waste heat of flue gas after heat exchange, thereby improving the thermal efficiency of the gas-fired water heating equipment, ensuring smooth flue gas emission, reducing the probability of abnormalities or noise during flue gas emission, and improving the user experience of the gas-fired water heating equipment. The gas-fired water heating equipment can be, but is not limited to, gas water heaters, gas wall-hung boilers, etc.

[0047] Specifically, such as Figures 1 to 4 As shown, the condensing heat exchange device includes a smoke collection hood 2, a smoke guide tube assembly 1, and a condensing component 3. The smoke collection hood 2 has a lowerly open smoke collection chamber 23, which is used to collect the flue gas flowing out of the heat exchanger. The smoke guide tube assembly 1 is installed at the upper end of the smoke collection hood 2. The smoke guide tube assembly 1 includes an inner cylinder 111, a partition cylinder 121, and an outer cylinder 131 arranged sequentially from the inside to the outside. The inner cylinder 111 has a smoke inlet chamber 114 whose lower end communicates with the smoke collection chamber 23. The inner cylinder 111 and the partition cylinder 121 enclose an inner annular smoke chamber 14, and the inner cylinder 111 and the outer cylinder 131 together enclose an outer annular smoke chamber 15. The upper part of the smoke inlet chamber 114 and the inner annular smoke chamber 14... The inner ring smoke chamber 14 is closed at one end, with its upper end connected to the smoke inlet chamber 114 and its lower end connected to the outer ring smoke chamber 15. The upper end of the outer cylinder 131 is open and has a smoke outlet 1311. The upper end of the smoke inlet chamber 114 has multiple smoke outlet holes 1221 that connect the smoke outlet 1311 and the smoke inlet chamber 114. And / or, the partition cylinder 121 has multiple side smoke outlet holes 1211 that connect the inner ring smoke chamber 14 and the outer ring smoke chamber 15. The condenser assembly 3 includes two condenser tubes 31 that are coiled around the inner ring smoke chamber 14 and the outer ring smoke chamber 15, respectively. The condenser tubes 31 are used to introduce cold water.

[0048] The condensing heat exchange device provided in this embodiment has the following configuration: the inlet smoke chamber 114, the inner ring smoke chamber 14, and the outer ring smoke chamber 15 are sequentially separated from the inside to the outside. The lower end of the inlet smoke chamber 114 is connected to the smoke collection chamber 23, the upper end of the inner ring smoke chamber 14 is connected to the inlet smoke chamber 114, and the lower end is connected to the lower end of the outer ring smoke chamber 15. The upper end of the outer ring smoke chamber 15 is connected to the exhaust port 1311. This allows at least a portion of the flue gas entering the smoke collection chamber 23 to flow upward to the top of the inlet smoke chamber 114 and then into the inner ring smoke chamber 14. It then flows downward within the inner ring smoke chamber 14 until it enters the outer ring smoke chamber 15, and then passes through the outer ring smoke chamber 23. The flue gas flows upward from the annular smoke chamber 15 to the exhaust port 1311, thereby effectively extending the residence time of the flue gas inside the flue gas guide tube assembly 1. This increases the contact area and contact time between the flue gas and the condenser tubes 31 in the inner and outer annular smoke chambers 14 and 15, improving the heat exchange effect between the flue gas and the condenser assembly 3, and enhancing the residual heat absorption effect of the condenser assembly 3 on the flue gas. Simultaneously, the upper wall of the inlet smoke chamber 114 has a top smoke outlet 1221 connecting the exhaust port 1311 and the inlet smoke chamber 114, and / or the partition cylinder 121 has multiple side openings connecting the inner and outer annular smoke chambers 14 and 15. The flue gas vent 1211 allows some of the flue gas entering the inlet chamber 114 to flow directly out through the top flue gas vent 1221 to the exhaust port 1311, and / or allows some of the flue gas entering the inner ring flue chamber 14 to enter the outer ring flue chamber 15 through the side flue gas vent 1211 without having to flow downwards to the bottom of the inner ring flue chamber 14 for reversal. This increases the flow path and residence time of some flue gas inside the flue gas duct assembly 1 to improve heat exchange efficiency, while also making the flow path of some flue gas inside the flue gas duct assembly 1 relatively short, thus better balancing the smoothness of exhaust and the interaction between flue gas and cold air. The heat exchange effect of the condenser assembly 3 ensures heat exchange while reducing exhaust resistance and improving exhaust smoothness, thereby reducing the probability of abnormalities caused by poor exhaust and improving the user experience of the condenser heat exchange device. Furthermore, when the partition cylinder 121 is provided with a side flue gas hole 1211, the flue gas flowing from the side flue gas hole 1211 to the outer ring flue gas chamber 15 collides with the flue gas flowing from bottom to top in the outer ring flue gas chamber 15, which can further increase the residence time of some flue gas in the outer ring flue gas chamber 15, increase the contact area between the flue gas and the condenser tube 31 in the outer ring flue gas chamber 15, and further improve the heat exchange effect.

[0049] To improve the installation of the condensing heat exchanger in the gas-fired water heater, the smoke hood 2 includes a main hood body 21 with an open lower end. The main hood body 21 has a smoke collection chamber 23, and an installation edge 22 extends outward from the lower periphery of the main hood body 21 for connection with the body of the gas-fired water heater. The upper end of the main hood body 21 has a horizontally arranged mounting top plate 122, on which the smoke guide tube assembly 1 is installed to facilitate the installation and fixation of the smoke guide tube assembly 1 at the top of the smoke hood 2, thereby improving the installation accuracy of the smoke guide tube assembly 1 on the smoke hood 2. A top through hole 212 is provided on the mounting top plate 122, which connects the smoke collection chamber 23 and the smoke inlet chamber 114.

[0050] In one embodiment, to improve the ease of installation of the smoke guide assembly 1 on the smoke hood 2, the outer cylinder portion 131 is inserted into the top through hole 212, and a flange portion 132 extends outward from the periphery of the outer cylinder portion 131, the flange portion 132 being fitted and connected to the inner wall of the smoke hood 2. This arrangement facilitates the installation and positioning of the smoke guide assembly 1 on the smoke hood 2 through the cooperation between the outer cylinder portion 131 and the top through hole 212 and the abutment between the flange portion 132 and the inner side of the smoke hood 2, ensuring the sealing performance of the smoke guide assembly 1 and the smoke hood 2 after assembly.

[0051] In another embodiment, the smoke guide section may also be located entirely outside the smoke collection hood 2 and abut against and be fastened to the upper side of the mounting plate section 211.

[0052] In one embodiment, the flange portion 132 abuts against the lower side of the mounting plate portion 211 and is detachably connected by fasteners to facilitate the overall disassembly and replacement of the smoke guide assembly 1. Multiple fasteners are spaced circumferentially around the outer cylinder 13 to ensure the installation stability of the smoke guide assembly 1 on the smoke hood 2. A sealing ring is sandwiched between the flange portion 132 and the mounting plate portion 211 to ensure a tight seal after connection. In other embodiments, the flange portion 132 and the mounting plate portion 211 can be welded.

[0053] In one embodiment, the upper wall of the flue gas inlet chamber 114 has a top-outlet flue gas hole 1221, and the partition cylinder 121 has a side-through flue gas hole 1211. This facilitates balancing the smoothness of flue gas flow and heat exchange efficiency by controlling the ventilation area of ​​the top-outlet flue gas hole 1221. In another embodiment, only the upper wall of the flue gas inlet chamber 114 may have a top-outlet flue gas hole 1221. In yet another embodiment, only the partition cylinder 121 may have a side-through flue gas hole 1211, while the upper wall of the flue gas inlet chamber 114 may not have a top-outlet flue gas hole 1221.

[0054] To direct more flue gas towards the condenser assembly 3, several connecting ports 1111 are provided at the upper end of the inner cylinder 111. The inner ring flue chamber 14 is connected to the inlet flue chamber 114 through the connecting ports 1111. The total ventilation area of ​​all connecting ports 1111 is S1, and the total ventilation area of ​​all exhaust ports 1221 is S2, where S1 > S2. Preferably, S1 ≥ 5 * S2. This allows most of the flue gas entering the inlet flue chamber 114 to enter the inner ring flue chamber 14 through the connecting ports 1111, thereby contacting the condenser tube 31 between the inner ring flue chamber 14 and the outer ring flue chamber 15. This ensures the heating effect of the water in the condenser tube 31 and improves the absorption of waste heat from the flue gas. A small portion of the flue gas flows directly out to the exhaust port 1311 through the exhaust ports 1221, ensuring the overall smooth discharge of the flue gas.

[0055] In one embodiment, S1 ≥ 10 * S2 to better ensure that most of the flue gas in the smoke inlet chamber 114 flows into the smoke inlet chamber 114. Further, S1 ≤ 20 * S2 to avoid the total ventilation area of ​​the exhaust smoke hole 1221 being too small, which would reduce the smoothness of flue gas emission.

[0056] like Figures 4 to 6 As shown, to seal the top ends of the inner annular smoke chamber 14 and the smoke inlet chamber 114, in one embodiment, a top plate 122 is connected to the upper end of the partition cylinder 121. The top plate 122 abuts against the inner cylinder 111 to seal the upper end of the smoke inlet chamber 114. The top plate 122 seals the upper end of the inner annular smoke chamber 14. A smoke outlet hole 1221 is provided on the top plate 122.

[0057] That is, the flue assembly 1 includes an inner cylinder 11, a middle cylinder 12, and an outer cylinder 13 spaced apart from the inside to the outside. The inner cylinder 11 includes an inner cylinder portion 111, and the inner cylinder 11 has an open structure at both the top and bottom ends; the middle cylinder 12 includes a partition cylinder portion 121 and a top plate portion 122, and the middle cylinder 12 has an open structure at the bottom end and a closed structure at the top end; the outer cylinder 13 includes an outer cylinder portion 131 and a flange portion 132, and the outer cylinder 13 has an open structure at both the top and bottom ends.

[0058] In one embodiment, the inner cylinder 11, the intermediate cylinder 12, and the outer cylinder 13 are all cylindrical structures to facilitate processing. In other embodiments, the cross-sections of the inner cylinder 11, the intermediate cylinder 12, and the outer cylinder 13 may also be elliptical, rectangular, or the like.

[0059] In other embodiments, the upper end of the inner cylinder 111 is connected to a top plate 122, and the top plate 122 has a smoke outlet hole 1221. A top partition plate is connected between the upper end of the inner cylinder 11 and the top end of the middle cylinder 12 to close the upper end of the inner annular smoke chamber 14.

[0060] The smoke inlet chamber 114 is a cylindrical cavity, and multiple sets of exhaust smoke holes 1221 are arranged at intervals around the axis of the cylindrical cavity. Each set of exhaust smoke holes 1221 includes multiple exhaust smoke holes 1221 arranged at radial intervals along the cylindrical cavity. This increases the total ventilation area of ​​the exhaust smoke holes 1221 while reducing the size of a single exhaust smoke hole 1221, thus controlling the speed at which the flue gas is discharged through the exhaust smoke holes 1221. At the same time, the multiple sets of exhaust smoke holes 1221 are arranged at intervals along the circumference of the cylindrical cavity, which also helps to achieve circumferential uniformity of the flue gas when it flows through the top plate 122.

[0061] In one embodiment, the inner cylinder 11 and the intermediate cylinder 12 are machined separately to reduce the machining difficulty of the flue assembly 1. To improve the assembly accuracy and reliability of the inner cylinder 11 and the intermediate cylinder 12, the upper end of the inner cylinder 111 is folded and connected to an abutment plate 112, which abuts against the lower side of the top plate 122 to increase the contact area between the inner cylinder 11 and the intermediate cylinder 12, thereby increasing the support stability of the intermediate cylinder 12 on the inner cylinder 11 and improving the assembly stability.

[0062] In one embodiment, multiple connecting ports 1111 extend through the upper end of the inner cylinder portion 111 and are spaced apart circumferentially along the inner cylinder portion 111 to reduce the processing difficulty of the inner cylinder 11. A support arm is formed between two adjacent connecting ports 1111, and an abutment plate portion 112 is connected to the upper end of each support arm. In other embodiments, the connecting ports 1111 may be spaced apart from the upper end of the inner cylinder portion 111. In this case, the abutment plates 112 may be arranged in a ring shape or multiple portions may be spaced apart circumferentially along the inner cylinder portion 111.

[0063] To ensure the assembly stability of the smoke duct assembly 1, the inner cylinder 11 and the intermediate cylinder 12 are welded together. Specifically, the abutment plate portion 112 and the top plate portion 122 are welded together to prevent smoke leakage at the connection point and to ensure the overall structural strength and rigidity of the smoke duct assembly 1. In other embodiments, the abutment plate portion 112 and the top plate portion 122 can also be connected by screws.

[0064] In one embodiment, the partition cylinder 121 is vertically spaced with multiple groups of flue holes. Each group of flue holes includes multiple side-through flue holes 1211 spaced circumferentially along the partition cylinder 121. From bottom to top, the total ventilation area of ​​all side-through flue holes 1211 in the same group of flue holes gradually decreases. This arrangement makes the resistance of flue gas flowing from the upper side-through flue holes 1211 into the outer ring flue chamber 15 greater than the resistance of flue gas flowing from the lower side-through flue holes 1211 into the outer ring flue chamber 15. This reduces the amount of flue gas flowing from the upper side-through flue holes 1211, which is beneficial for most of the flue gas entering the inner ring flue chamber 14 to flow downward to the lower side-through flue holes 1211 and the lower end connection between the inner ring flue chamber 14 and the outer ring flue chamber 15. This increases the contact area between the condenser tube 31 in the inner ring flue chamber 14 and the flue gas, which helps to ensure the heat exchange effect.

[0065] To reduce processing difficulty, the number of side-through smoke holes 1211 in all smoke hole groups is the same, and in two adjacent smoke hole groups, the diameter of the lower side-through smoke hole 1211 is larger than the diameter of the upper side-through smoke hole 1211. This makes it easier to control the relationship between the total ventilation area of ​​the side-through smoke holes 1211 in two adjacent smoke hole groups.

[0066] In other embodiments, all side smoke holes 1211 may have the same individual ventilation area, and in two adjacent smoke hole groups, the number of side smoke holes 1211 in the lower smoke hole group is greater than the number of side smoke holes 1211 in the upper smoke hole group.

[0067] In one embodiment, the side smoke opening 1211 is circular to facilitate its processing. In other embodiments, the side smoke opening 1211 may also be rectangular, elliptical, or other shapes.

[0068] like Figure 4 , Figure 5 and Figure 7 As shown, in one embodiment, a bottom plate 113 is connected between the lower ends of the inner cylinder 111 and the bottom plate 113. The bottom plate 113 closes the lower ends of the inner annular smoke chamber 14 and the outer annular smoke chamber 15. The lower end of the partition cylinder 121 is set higher than the bottom plate 113, so that the gap between the partition cylinder 121 and the bottom plate 113 forms a communication channel, and the lower ends of the inner annular smoke chamber 14 and the outer annular smoke chamber 15 are connected through the communication channel. This arrangement simplifies the processing of the intermediate cylinder 12 and facilitates the recovery of condensate and the placement of the condenser assembly 3 between the inner cylinder 11 and the outer cylinder 13. In other embodiments, the lower end of the partition cylinder 121 may also abut against the bottom plate 113, and the lower side wall of the partition cylinder 121 has a communication channel connecting the inner annular smoke chamber 14 and the outer annular smoke chamber 15.

[0069] In one embodiment, the bottom plate portion 113 is connected to the lower side of the inner cylinder portion 111 and extends radially to the outer cylinder portion 131, with the lower end of the outer cylinder portion 131 abutting against the bottom plate portion 113. This arrangement facilitates the assembly of the inner cylinder 11 and the outer cylinder 13, improving assembly efficiency. In other embodiments, the bottom plate portion 113 may also be connected to the lower end of the outer cylinder portion 131 and extend inward to the lower side of the inner cylinder portion 111. In yet another embodiment, the bottom plate portion 113 may be separately disposed from both the inner cylinder portion 111 and the outer cylinder portion 131 and be welded to or detachably connected to both the inner cylinder portion 111 and the outer cylinder portion 131.

[0070] To improve the assembly stability and ease of the outer cylinder 13 and inner cylinder 11, the flange portion 132 of the outer cylinder 13 is fitted and connected to the base plate portion 113. This increases the contact area between the outer cylinder 13 and the inner cylinder 11, ensuring the reliability of their connection. Preferably, the flange portion 132 and the base plate portion 113 are welded together, so that the smoke guide assembly 1 forms an integral rigid structure with strong sealing performance.

[0071] like Figure 8 and Figure 9 As shown, in one embodiment, the two condenser tubes 31 are an inner condenser tube 31a and an outer condenser tube 31b spaced apart outside the inner condenser tube 31a. Each condenser tube 31 includes two bent and connected half-tube segments. Each half-tube segment has multiple spiral tube segments 311 spirally wound from top to bottom from the connection point of the two half-tube segments. The spiral tube segments 311 of the two half-tube segments are staggered from top to bottom, and the end ports of the two lowest spiral tube segments 311 form a water inlet port and a water outlet port, respectively.

[0072] Since the condenser tube 31 includes two bent and connected half-pipe sections, the connection between one half-pipe section and the other half-pipe section is the water inlet section, and the other half-pipe section is the water outlet section. The spiral section 311 on the water inlet section is the water inlet spiral section 311a, and the spiral section 311 on the water outlet section is the water outlet spiral section 311b. That is, the water inlet spiral section 311a and the water outlet spiral section 311b of the same condenser tube 31 are arranged alternately from top to bottom.

[0073] That is, the above arrangement ensures that the connection point of one of the two adjacent helical tube segments 311 in the vertical direction is the inlet water flow and the other is the outlet water flow, which helps to ensure the temperature uniformity of the condenser tube 31, improve the preheating effect, and improve the heat exchange effect between the water flow and the flue gas in the condenser tube 31. At the same time, this arrangement allows both the inlet and outlet water ports to be located at the lower end of the condenser tube 31, which facilitates the pipe connection between the condenser tube 31 and the heat exchanger. Furthermore, this arrangement can reduce the radial space occupied by the condenser tube 31, thereby reducing the width requirements of the inner ring flue chamber 14 and the outer ring flue chamber 15.

[0074] To improve the piping connection between the condenser assembly 3 and the heat exchanger, the condenser assembly 3 also includes an inlet pipe section 32 and an outlet pipe section 33. One end of each of the inlet pipe section 32 and the outlet pipe section 33 is located between the inner cylinder section 111 and the outer cylinder section 131, and the other end extends out of the outer cylinder section 131. The inlet ends of both condenser tubes 31 are connected to the inlet pipe section 32, and the outlet ends of both condenser tubes 31 are connected to the outlet pipe section 33. This arrangement allows the water entering the inlet pipe section 32 to flow to the two condenser tubes 31 respectively, exchange heat and increase in temperature within the two condenser tubes 31, and then converge to the outlet pipe section 33 before flowing out. This arrangement reduces the number of ports connecting the condenser heat exchanger to the heat exchanger to only two, simplifying the installation of the condenser heat exchanger.

[0075] To improve the ease of installation of the condenser assembly 3, both the inlet pipe 32 and the outlet pipe 33 are located between the bottom plate 113 and the lower end of the partition cylinder 121 to avoid interference between the inlet pipe 32 and the outlet pipe 33 and the partition cylinder 121.

[0076] In one embodiment, the outer cylinder 131 has a clearance perforation 1312 through which the inlet pipe 32 and the outlet pipe 33 pass. To prevent flue gas from flowing out of the clearance perforation 1312, the condensing heat exchange device also includes a sealing member 4, which is sealed and installed in the clearance perforation 1312. The sealing member 4 has two insertion holes, into which the inlet pipe 32 and the outlet pipe 33 are respectively interference-fitted. The sealing member 4 is made of rubber. This allows the inlet pipe 32 and the outlet pipe 33 to extend out of the outer cylinder 131 while ensuring a sealing effect after assembly and preventing flue gas leakage.

[0077] like Figure 10 As shown, since the flue gas is condensed into condensate as it flows through the condenser pipe 31, in order to collect and discharge the condensate, the inner cylinder 111, the outer cylinder 131 and the bottom plate 113 form a water collection tank 16. The water collection tank 16 is connected to the lower ends of the outer ring flue chamber 15 and the inner ring flue chamber 14. The condensate formed by the partial condensation of the flue gas drips into the water collection tank 16 and is collected.

[0078] To facilitate condensate drainage, the condensing heat exchanger also includes a drain connector 5. The first end of the drain connector 5 is inserted into the water collection tank 16, and the second end is sealed through a drain port 1313 on the outer cylinder 131, with the second end higher than the first end. This arrangement ensures that drainage only occurs when the condensate in the water collection tank 16 submerges the first end of the drain connector 5 and reaches the height of the second end. This keeps the first end of the drain connector 5 constantly sealed by water, preventing flue gas from being discharged through the drain connector 5 and drain pipe.

[0079] The drain connector 5 is preferably an L-shaped elbow connector, with one end of the L-shaped connector vertically inserted into the water collection tank 16, and the other end of the L-shaped connector extending horizontally and passing through the outer cylinder 131.

[0080] In the specific embodiments described above, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the technical features are described. However, as long as the combinations of these technical features are not contradictory, they should be considered within the scope of this specification. The specific embodiments described above only illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A condensation heat exchange device, characterized in that, include: Smoke hood (2), which has a smoke collection chamber (23); A smoke guide assembly (1) is installed at the upper end of the smoke collection hood (2). The smoke guide assembly (1) includes an inner cylinder (111), a partition cylinder (121), and an outer cylinder (131) arranged sequentially from the inside to the outside. The inner cylinder (111) has a smoke inlet chamber (114) whose lower end communicates with the smoke collection chamber (23) on its inner side. The inner cylinder (111) and the partition cylinder (121) form an inner annular smoke chamber (14). The inner cylinder (111) and the outer cylinder (131) together form an outer annular smoke chamber (15). The smoke inlet chamber (114) and the partition cylinder (121) form an outer annular smoke chamber (15). The upper end of the inner ring smoke chamber (14) is closed. The upper end of the inner ring smoke chamber (14) is connected to the smoke inlet chamber (114) and the lower end is connected to the outer ring smoke chamber (15). The upper end of the outer cylinder (131) is open and has a smoke outlet (1311). The upper wall of the smoke inlet chamber (114) has a plurality of top smoke holes (1221) that connect the smoke outlet (1311) and the smoke inlet chamber (114). And / or, the partition cylinder (121) has a plurality of side smoke holes (1211) that connect the inner ring smoke chamber (14) and the outer ring smoke chamber (15). The condenser assembly (3) includes two condenser tubes (31) respectively coiled in the inner ring smoke chamber (14) and the outer ring smoke chamber (15), and the condenser tubes (31) are used to pass cold water through them.

2. The condensation heat exchanger according to claim 1, characterized in that, The partition cylinder (121) has multiple smoke hole groups spaced vertically. Each smoke hole group includes multiple side smoke holes (1211) spaced circumferentially along the partition cylinder (121). From bottom to top, the total ventilation area of ​​all the side smoke holes (1211) in the same smoke hole group gradually decreases.

3. The condensation heat exchanger according to claim 1, characterized in that, The upper side wall of the inner cylinder (111) is provided with a plurality of connecting ports (1111). The inner ring smoke chamber (14) is connected to the smoke inlet chamber (114) through the connecting ports (1111). The total ventilation area of ​​all the connecting ports (1111) is S1, and the total ventilation area of ​​all the top smoke holes (1221) is S2. S1≥5*S2; And / or, the smoke inlet chamber (114) is a cylindrical cavity, and the exhaust smoke holes (1221) are arranged in multiple sets around the axis of the cylindrical cavity, each set of exhaust smoke holes (1221) including multiple exhaust smoke holes (1221) arranged radially along the cylindrical cavity.

4. The condensation heat exchanger according to claim 1, characterized in that, The top end of the partition cylinder (121) is connected to a top plate (122), which abuts against the top end of the inner cylinder (111). The top plate (122) closes the upper end of the inner ring smoke chamber (14) and the upper end of the smoke inlet chamber (114). The top plate (122) is provided with the exhaust smoke hole (1221).

5. The condensation heat exchanger according to claim 1, characterized in that, A bottom plate (113) is provided between the lower end of the inner cylinder (111) and the lower end of the outer cylinder (131). The bottom plate (113) closes the lower ends of the inner ring smoke chamber (14) and the outer ring smoke chamber (15). The lower end of the partition cylinder (121) is higher than the bottom plate (113), and a connecting channel is formed between the lower end of the partition cylinder (121) and the bottom plate (113) to connect the inner ring smoke chamber (14) and the outer ring smoke chamber (15).

6. The condensing heat exchanger according to any one of claims 1-5, characterized in that, The condenser tube (31) includes two bent and connected half-pipe sections. Each half-pipe section has multiple spiral tube segments (311) spirally wound from top to bottom from the connection point of the two half-pipe sections. The spiral tube segments (311) of the two half-pipe sections are staggered from top to bottom. The ends of the two lowest spiral tube segments (311) form a water inlet port and a water outlet port, respectively. And / or, the condenser tube (31) further includes a water inlet pipe section (32) and a water outlet pipe section (33), the water inlet ends of the two condenser tubes (31) are connected to the water inlet pipe section (32), the water outlet ends of the two condenser tubes (31) are connected to the water outlet pipe section (33), and the water inlet pipe section (32) and the water outlet pipe section (33) both extend out of the outer cylinder section (131).

7. The condensation heat exchanger according to claim 6, characterized in that, A bottom plate (113) is connected between the lower end of the inner cylinder (111) and the lower end of the outer cylinder (131). The water inlet pipe (32) and the water outlet pipe (33) are both located between the lower end of the partition cylinder (121) and the bottom plate (113).

8. The condensing heat exchanger according to any one of claims 1-5, characterized in that, A bottom plate (113) is connected between the lower end of the inner cylinder (111) and the lower end of the outer cylinder (131). The lower end of the partition cylinder (121) is higher than the bottom plate (113). The inner cylinder (111), the outer cylinder (131) and the bottom plate (113) together form a water collection trough (16). The water collection trough (16) connects the lower ends of the outer ring smoke chamber (15) and the inner ring smoke chamber (14). The condensation heat exchange device also includes a drain connector (5), the first end of which is inserted into the water collection tank (16) and the second end is sealed and protrudes from the outer cylinder (131), and the second end of the drain connector (5) is higher than the first end of the drain connector (5).

9. The condensing heat exchanger according to any one of claims 1-5, characterized in that, The top of the smoke hood (2) is provided with a top through hole (212), the outer cylinder (131) is inserted into the top through hole (212), and the periphery of the outer cylinder (131) extends outward with a flange (132), the flange (132) is attached to and connected to the inner wall of the smoke hood (2).

10. A gas-fired hot water device, comprising a heat exchanger, wherein the inlet end of the heat exchanger is connected to an inlet pipe, characterized in that, It also includes a condensing heat exchange device as described in any one of claims 1-9, wherein the smoke hood (2) is disposed above the heat exchanger, and both ends of the condenser tube (31) are connected in series to the water inlet pipe.

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