Condensation heat exchange device and gas water heating equipment

Abstract

The utility model 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 condenser pipe, reduce the flowing resistance of the flue gas and improve the flowing smoothness of the flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a condensing heat exchange device and a gas water heater. Background Art

[0002] A gas water heater typically consists of a burner, a main heat exchanger, and a fume hood, arranged in this order 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 to hot water. The flue gas cools down and is collected in the fume hood for discharge.

[0003] To improve the thermal efficiency of a gas water heater, a condensing heat exchange device is currently available. The device comprises a smoke exhaust hood, a smoke guide inner tube, a smoke collection hood, and a condenser tube. The smoke collection hood is positioned above the main heat exchanger to collect smoke flowing out of the main heat exchanger. The smoke guide inner tube is mounted on the top of the smoke collection hood and communicates with the inner cavity of the smoke collection hood. The top of the smoke guide inner tube is closed, and a smoke guide opening is defined between the lower end and the top of the smoke collection hood. The smoke exhaust hood is spaced apart and sleeved on the outer wall of the smoke guide inner tube, forming an annular smoke flow path. The lower end of the smoke flow path communicates with the smoke guide opening, while the upper end is open to form a smoke exhaust port. The condenser pan is spirally coiled around the outer side of the smoke guide inner tube and located within the smoke flow path. The condenser tube is connected in series upstream of the main heat exchanger.

[0004] In the condensing heat exchange device provided by the prior art, the flue gas flowing out of the main heat exchanger flows into the interior of the smoke guide inner tube through the smoke hood. Since the upper end of the smoke guide inner tube is closed and the bottom has a smoke guide port, the upward-flowing flue gas flows to the smoke guide port under the guidance of the smoke guide inner tube and flows into the flue gas flow duct through the smoke guide port. The flue gas entering the flue gas flow duct exchanges heat with the water in the condenser tube, so that the water in the condenser tube can further absorb the waste heat in the flue gas, thereby improving the heat utilization rate. However, in the condensing heat exchange device provided by the prior art, since the smoke outlet is set between the lower end of the smoke guide inner tube and the smoke hood, the upward-flowing flue gas can only be discharged through the smoke outlet, the flue gas flow duct and the smoke outlet in sequence. The flow resistance of the flue gas when it changes direction from the inside of the smoke guide inner tube to the flue gas flow duct is relatively large, which affects the smoothness of the smoke exhaust and also increases the abnormality and noise during the smoke exhaust, affecting the user experience of the gas water heater. Utility Model Content

[0005] One of the technical problems solved by the present invention is to provide a condensing heat exchange device, which can effectively solve the problems of large smoke flow resistance and abnormal sounds and noise during smoke exhaust in existing condensing heat exchange devices, while ensuring heat exchange efficiency and improving the smoothness of smoke exhaust.

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

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

[0008] A condensing heat exchange device, comprising:

[0009] A smoke collecting hood having a smoke collecting cavity;

[0010] The smoke exhaust pipe is an airtight container, the interior of the smoke exhaust pipe being connected to the smoke exhaust port and the smoke exhaust port being connected to the smoke exhaust port.

[0011] The condensation component comprises two condensation pipes which are respectively coiled in the inner ring smoke cavity and the outer ring smoke cavity, and the condensation pipes are used for passing cold water.

[0012] The condensing heat exchange device described in the present invention has the following beneficial effects compared with the background technology: since the smoke inlet chamber, the inner ring smoke chamber and the outer ring smoke chamber are separated and arranged in sequence from the inside to the outside, at least part of the smoke entering the smoke collecting chamber flows upward to the top of the smoke inlet chamber and then enters the inner ring smoke chamber, and then flows downward in the inner ring smoke chamber until it enters the outer ring smoke chamber, and then flows upward through the outer ring smoke chamber to the smoke outlet, thereby effectively prolonging the residence time of the smoke inside the smoke guide tube group, thereby increasing the contact area and contact time of the smoke with the condensation tubes in the inner ring smoke chamber and the outer ring smoke chamber, improving the heat exchange effect between the smoke and the condensation component, and improving the condensation component's absorption effect of the waste heat of the smoke; at the same time, since the upper end cavity wall of the smoke inlet chamber is provided with a top smoke outlet connecting the smoke outlet and the smoke inlet chamber, and / or the separating cylinder is provided with a plurality of side smoke outlets connecting the inner ring smoke chamber and the outer ring smoke chamber, part of the smoke entering the smoke inlet chamber can directly flow out through the top smoke outlet to The smoke at the smoke exhaust port and / or part of the smoke entering the inner ring smoke chamber can enter the outer ring smoke chamber through the side smoke hole without flowing downward to the bottom of the inner ring smoke chamber and then changing direction, thereby increasing the flow path and residence time of part of the smoke in the smoke guide tube group to improve the heat exchange efficiency, while making the flow path of part of the smoke in the smoke guide tube group relatively short, thereby better taking into account the smoothness of smoke exhaust and the heat exchange effect of the smoke and the condensation component, ensuring the heat exchange effect while reducing the smoke exhaust resistance and improving the smoothness of smoke exhaust, thereby reducing the probability of abnormalities due to poor smoke exhaust and improving the user experience of the condensation heat exchange device; furthermore, when a side smoke hole is opened on the partition cylinder, the smoke flowing from the side smoke hole to the outer ring smoke chamber collides with the smoke flowing from bottom to top in the outer ring smoke chamber, which can further increase the residence time of part of the smoke in the outer ring smoke chamber, increase the contact time of the smoke with the condensation tube in the outer ring smoke chamber, and further improve the heat exchange effect.

[0013] In one embodiment, the partition cylinder portion is provided with a plurality of smoke hole groups spaced apart along the vertical direction, and each of the smoke hole groups includes a plurality of the side smoke holes spaced apart along the circumference of the partition cylinder portion, and the total ventilation area of all the side smoke holes in the same smoke hole group gradually decreases from bottom to top.

[0014] In one embodiment, a plurality of communication openings are formed on the upper side wall of the inner cylinder, and the inner annular smoke chamber is connected to the smoke inlet chamber through the communication openings. The total ventilation area of all the communication openings is S1, and the total ventilation area of all the top smoke outlet holes is S2, where S1 ≥ 5S2.

[0015] And / or, the smoke inlet cavity is a cylindrical cavity, and the smoke outlet holes are arranged in multiple groups at intervals around the axis of the cylindrical cavity, and each group of the smoke outlet holes includes multiple smoke outlet holes arranged at intervals along the radial direction of the cylindrical cavity.

[0016] In one embodiment, the top end of the separating cylinder is connected to a top plate portion, the top plate portion abuts against the top end of the inner cylinder portion, the top plate portion closes the upper end of the inner ring smoke chamber and the upper end of the smoke inlet chamber, and the top plate portion is provided with the top smoke outlet hole.

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

[0018] In one embodiment, the condenser comprises two bent half-pipe sections connected to each other, each half-pipe section having a plurality of spiral pipe sections spirally wound from top to bottom at the connection point of the two half-pipe sections, the spiral pipe sections of the two half-pipe sections being staggered from top to bottom, and the ends of the two lowermost spiral pipe sections forming a water inlet port and a water outlet port, respectively;

[0019] And / or, the condenser also includes a water inlet pipe portion and a water outlet pipe portion, the water inlet ends of the two condenser pipes are connected to the water inlet pipe portion, the water outlet ends of the two condenser pipe portions are connected to the water outlet pipe portion, and the water inlet pipe portion and the water outlet pipe portion both pass through the outer cylinder portion.

[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 portion is connected between the lower end of the inner cylinder portion and the lower end of the outer cylinder portion, the lower end of the separating cylinder portion is higher than the bottom plate portion, and the inner cylinder portion, the outer cylinder portion and the bottom plate portion together form a water collecting trough, which communicates with the lower ends of the outer annular smoke chamber and the inner annular smoke chamber;

[0022] The condensing heat exchange device also includes a drainage joint, a first end of which is inserted into the water collecting tank and a second end of which is sealed and passes through the outer cylinder, and the second end of the drainage joint is higher than the first end of the drainage joint.

[0023] In one embodiment, a top through hole is opened on the top of the smoke hood, the outer tube portion is inserted into the top through hole, and a flange portion extends outward from the periphery of the outer tube portion, and the flange portion 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 water heating device includes a heat exchanger, the water inlet end of the heat exchanger is connected to a water inlet pipe, and also includes the condensing heat exchange device as described above, the smoke hood is arranged above the heat exchanger, and the two ends of the condensing pipe are connected in series to the water inlet pipe.

[0026] Compared with the background technology, the gas water heater described in the present invention has the following beneficial effects: by adopting the above-mentioned condensation heat exchange device, it can ensure the condensation heat exchange effect with the flue gas while reducing the flue gas emission resistance, improving the flue gas smoothness, reducing the abnormalities or noise caused by poor flue gas emission, and improving the user experience of the gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a condensing heat exchange device provided in an embodiment of the present utility model;

[0028] Figure 2 A schematic diagram of the disassembled structure of the condensing heat exchange device provided in an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the flue gas flow of the condensing heat exchange device provided in an embodiment of the present utility model;

[0030] Figure 4 A partial structural cross-sectional view of a condensing heat exchange device provided in an embodiment of the present utility model;

[0031] Figure 5 A schematic structural diagram of the inner cylinder provided in an embodiment of the present utility model;

[0032] Figure 6 A schematic structural diagram of the intermediate cylinder provided in an embodiment of the present utility model;

[0033] Figure 7 A schematic structural diagram of the outer cylinder provided in an embodiment of the present utility model;

[0034] Figure 8 A schematic diagram of the water flow direction of the condensing heat exchange device provided in an embodiment of the present utility model;

[0035] Figure 9 A schematic structural diagram of a condensing assembly provided in an embodiment of the present utility model;

[0036] Figure 10 This is a cross-sectional view of the condensing heat exchange device provided in an embodiment of the present utility model at another cross-sectional plane.

[0037] Description of labels:

[0038] 1. Smoke guide tube assembly; 11. Inner cylinder; 111. Inner cylinder; 1111. Communication port; 112. Abutment plate; 113. Bottom plate; 114. Smoke inlet chamber; 12. Intermediate cylinder; 121. Separating cylinder; 1211. Side smoke hole; 122. Top plate; 1221. Top smoke outlet; 13. Outer cylinder; 131. Outer cylinder; 1311. Smoke exhaust port; 1312. Avoidance hole; 1313. Drainage port; 132. Flange; 14. Inner ring smoke chamber; 15. Outer ring smoke chamber; 16. Sump;

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

[0040] 3. Condensation assembly; 31. Condensation tube; 31a. Condensation inner tube; 31b. Condensation outer tube; 311. Spiral tube section; 311a. Water inlet spiral section; 311b. Water outlet spiral section; 32. Water inlet pipe section; 33. Water outlet pipe section;

[0041] 4. Sealing piece; 5. Drainage joint. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] This embodiment provides a condensing heat exchange device that can be used in gas water heaters to absorb and utilize the residual heat from the flue gas after heat exchange, thereby improving the thermal efficiency of the gas water heater, ensuring smooth flue gas discharge, reducing the probability of abnormalities or noise during flue gas discharge, and improving the user experience of the gas water heater. The gas water heater can include, but is not limited to, gas water heaters, gas wall-mounted boilers, and the like.

[0047] Specifically, if Figures 1 to 4 As shown, the condensing heat exchange device includes a smoke hood 2, a smoke guide tube group 1 and a condensing assembly 3. The smoke hood 2 has a smoke chamber 23 with an open bottom, and the smoke chamber 23 is used to collect the smoke flowing out of the heat exchanger; the smoke guide tube group 1 is installed at the upper end of the smoke hood 2, and the smoke guide tube group 1 includes an inner cylinder part 111, a separating cylinder part 121 and an outer cylinder part 131 which are sequentially spaced from the inside to the outside. The inner side of the inner cylinder part 111 has a smoke inlet chamber 114 whose lower end is connected to the smoke chamber 23. The inner cylinder part 111 and the separating cylinder part 121 surround an inner annular smoke chamber 14, and the inner cylinder part 111 and the outer cylinder part 131 together surround an outer annular smoke chamber 15. The upper ends of the smoke inlet chamber 114 and the inner annular smoke chamber 14 are connected. The ends are 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 provided with a smoke exhaust port 1311, the upper end cavity wall of the smoke inlet chamber 114 is provided with a plurality of top smoke outlets 1221 connecting the smoke exhaust port 1311 and the smoke inlet chamber 114, and / or, the partition cylinder 121 is provided with a plurality of side smoke holes 1211 connecting the inner ring smoke chamber 14 and the outer ring smoke chamber 15; the condensation component 3 includes two condensation tubes 31 respectively coiled and arranged in the inner ring smoke chamber 14 and the outer ring smoke chamber 15, and the condensation tubes 31 are used to pass cold water.

[0048] The condensing heat exchange device provided in this embodiment is separated from each other in sequence from the inside to the outside, and the lower end of the smoke inlet chamber 114 is connected to the smoke collection chamber 23, 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 lower end of the outer ring smoke chamber 15, and the upper end of the outer ring smoke chamber 15 is connected to the smoke exhaust port 1311, so that at least part of the smoke entering the smoke collection chamber 23 flows upward to the top of the smoke inlet chamber 114 and then enters the inner ring smoke chamber 14, and then flows downward in the inner ring smoke chamber 14 until it enters the outer ring smoke chamber 15, and then passes through the outer ring smoke chamber 15. The annular smoke chamber 15 flows upward to the smoke outlet 1311, thereby effectively prolonging the residence time of the smoke in the smoke guide tube group 1, thereby increasing the contact area and contact time of the smoke with the condensation tube 31 in the inner annular smoke chamber 14 and the outer annular smoke chamber 15, improving the heat exchange effect between the smoke and the condensation component 3, and improving the waste heat absorption effect of the smoke by the condensation component 3; at the same time, since the upper end cavity wall of the smoke inlet chamber 114 is provided with a top smoke outlet 1221 connecting the smoke outlet 1311 and the smoke inlet chamber 114, and / or, the partition cylinder 121 is provided with a plurality of side holes connecting the inner annular smoke chamber 14 and the outer annular smoke chamber 15 The smoke holes 1211 allow part of the smoke entering the smoke inlet chamber 114 to flow directly out to the smoke outlet 1311 through the top smoke outlet 1221, and / or part of the smoke entering the inner ring smoke chamber 14 can enter the outer ring smoke chamber 15 through the side smoke holes 1211 without flowing downward to the bottom of the inner ring smoke chamber 14 and then changing direction, thereby increasing the flow path and residence time of part of the smoke inside the smoke guide tube group 1 to improve the heat exchange efficiency, while making the flow path of part of the smoke inside the smoke guide tube group 1 relatively short, thereby better taking into account the smoothness of smoke exhaust and the relationship between smoke and cooling. The heat exchange effect of the condensing component 3 ensures the heat exchange effect while reducing the smoke exhaust resistance and improving the smoke exhaust smoothness, thereby reducing the probability of abnormalities due to poor smoke exhaust and improving the user experience of the condensing heat exchange device; furthermore, when a side smoke hole 1211 is opened on the partition cylinder 121, the smoke flowing from the side smoke hole 1211 to the outer ring smoke chamber 15 collides with the smoke flowing from bottom to top in the outer ring smoke chamber 15, which can further increase the residence time of part of the smoke in the outer ring smoke chamber 15, increase the contact area between the smoke and the condensation tube 31 in the outer ring smoke chamber 15, and further improve the heat exchange effect.

[0049] To improve the installation of the condensing heat exchange device in the gas 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 chamber 23. The lower periphery of the main hood body 21 extends outward with a mounting edge 22, which is used to connect to the body of the gas water heater. The upper end of the main hood body 21 has a horizontally arranged mounting top plate 122. The smoke guide tube group 1 is mounted on the mounting top plate 122 to facilitate the installation and fixation of the smoke guide tube group 1 on the top of the smoke hood 2, thereby improving the installation accuracy of the smoke guide tube group 1 on the smoke hood 2. A top through hole 212 is opened on the mounting top plate 122, which connects the smoke chamber 23 and the smoke inlet chamber 114.

[0050] In one embodiment, to facilitate installation of the smoke guide tube assembly 1 on the smoke hood 2, the outer tube portion 131 is inserted into the top through-hole 212, and a flange portion 132 extends outward from the periphery of the outer tube portion 131. The flange portion 132 abuts against and connects to the inner wall of the smoke hood 2. This arrangement facilitates installation and positioning of the smoke guide tube assembly 1 on the smoke hood 2 through the fit between the outer tube 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, thereby ensuring a tight seal after the smoke guide tube assembly 1 and the smoke hood 2 are assembled.

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

[0052] In one embodiment, the flange 132 abuts the underside of the mounting plate 211 and is removably connected via fasteners, facilitating the complete disassembly and replacement of the smoke guide assembly 1. Multiple fasteners are spaced circumferentially around the outer cylinder 13 to ensure stable installation of the smoke guide assembly 1 on the smoke hood 2. A sealing ring is interposed between the flange 132 and the mounting plate 211 to ensure a tight seal after connection. In other embodiments, the flange 132 and the mounting plate 211 may be welded.

[0053] In one embodiment, the upper wall of the smoke inlet chamber 114 is provided with a top smoke outlet 1221, and the partition cylinder 121 is provided with a side smoke outlet 1211. This facilitates controlling the ventilation area of the top smoke outlet 1221 to balance the smoothness of smoke flow and heat exchange efficiency. In another embodiment, only the upper wall of the smoke inlet chamber 114 may be provided with the top smoke outlet 1221. In yet another embodiment, only the partition cylinder 121 may be provided with the side smoke outlet 1211, while the upper wall of the smoke inlet chamber 114 may not be provided with the top smoke outlet 1221.

[0054] In order to allow more flue gas to flow into the condensation assembly 3, a plurality of connecting ports 1111 are provided at the upper end of the inner cylinder 111. 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 outlet holes 1221 is S2. S1>S2, preferably, S1≥5*S2. As a result, most of the flue gas entering the smoke inlet chamber 114 passes through the connecting ports 1111 and enters the inner ring smoke chamber 14, thereby contacting the condenser tube 31 between the inner ring smoke chamber 14 and the outer ring smoke chamber 15, ensuring the heating effect on the water in the condenser tube 31 and increasing the absorption of the flue gas waste heat. A small portion of the flue gas flows directly out to the smoke exhaust port 1311 through the top smoke outlet hole 1221, ensuring the overall smooth discharge of the flue gas.

[0055] In one embodiment, S1≥10*S2 to better ensure that most of the smoke in the smoke inlet cavity 114 flows into the smoke inlet cavity 114. Furthermore, S1≤20*S2 to avoid the total ventilation area of the top smoke outlet 1221 being too small, thereby reducing the smoothness of smoke exhaust.

[0056] like Figures 4 to 6 As shown, in order 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 1221 is formed on the top plate 122.

[0057] That is, the smoke guide tube assembly 1 includes an inner tube body 11, an intermediate tube body 12, and an outer tube body 13, which are spaced apart from each other from the inside to the outside. The inner tube body 11 includes an inner tube portion 111, and the inner tube body 11 has an open structure at both ends; the intermediate tube body 12 includes a partition tube portion 121 and a top plate portion 122, and the intermediate tube body 12 has an open lower end and a closed upper end; the outer tube body 13 includes an outer tube portion 131 and a flange portion 132, and the outer tube body 13 has an open structure at both ends.

[0058] In one embodiment, the inner cylinder 11, the middle 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 middle cylinder 12 and the outer cylinder 13 can also be elliptical, rectangular, etc.

[0059] In other embodiments, the upper end of the inner cylinder portion 111 is connected to a top plate portion 122, and a top smoke outlet hole 1221 is opened on the top plate portion 122. A top partition plate portion is connected between the upper end of the inner cylinder body 11 and the top end of the intermediate cylinder body 12 to close the upper end of the inner ring smoke chamber 14.

[0060] The smoke inlet chamber 114 is cylindrical, with multiple groups of top smoke outlet holes 1221 spaced about the axis of the cylindrical chamber. Each group of top smoke outlet holes 1221 includes multiple top smoke outlet holes 1221 spaced radially along the cylindrical chamber. This increases the total ventilation area of the top smoke outlet holes 1221 while reducing the size of each top smoke outlet hole 1221, thereby controlling the speed at which smoke is discharged through the top smoke outlet holes 1221. Furthermore, the multiple groups of top smoke outlet holes 1221 spaced circumferentially around the cylindrical chamber also facilitate circumferential uniformity of smoke as it flows through the top plate portion 122.

[0061] In one embodiment, the inner cylinder 11 and the intermediate cylinder 12 are machined separately to reduce the difficulty of manufacturing the smoke guide 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 portion 111 is folded and connected to an abutment plate portion 112. The abutment plate portion 112 abuts the lower side of the top plate portion 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 stability of the assembly.

[0062] In one embodiment, a plurality of communication openings 1111 extend through the upper end of the inner cylinder 111 and are spaced apart along the circumference of the inner cylinder 111 to reduce the difficulty of machining the inner cylinder 11. A support arm portion is formed between two adjacent communication openings 1111, and the upper end of each support arm portion is connected to an abutment plate portion 112. In other embodiments, the communication opening 1111 may be spaced apart from the upper end of the inner cylinder 111. In this case, the abutment plate portion 112 may be arranged in an annular shape, or may be spaced apart along the circumference of the inner cylinder 111.

[0063] To ensure the assembly stability of the smoke guide assembly 1, the inner cylinder 11 and the intermediate cylinder 12 are welded, specifically, the abutment plate 112 and the top plate 122 are welded to prevent smoke leakage at the connection and ensure the overall structural strength and rigidity of the smoke guide assembly 1. In other embodiments, the abutment plate 112 and the top plate 122 can also be screwed.

[0064] In one embodiment, the partition cylinder 121 is vertically spaced apart with a plurality of smoke hole groups, each of which includes a plurality of side smoke holes 1211 spaced apart along the circumference of 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. This arrangement makes the resistance of smoke flowing from the upper side smoke holes 1211 into the outer ring smoke chamber 15 greater than the resistance of smoke flowing from the lower side smoke holes 1211 into the outer ring smoke chamber 15, thereby reducing the flow of smoke flowing from the upper side smoke holes 1211, and facilitating most of the smoke entering the inner ring smoke chamber 14 to flow downward to the lower side smoke holes 1211 and the lower end connection point between the inner ring smoke chamber 14 and the outer ring smoke chamber 15, thereby increasing the contact area between the condenser 31 located in the inner ring smoke chamber 14 and the smoke, and facilitating heat exchange effect.

[0065] To reduce the difficulty of processing, the number of side smoke holes 1211 in all smoke hole groups is the same, and in two adjacent smoke hole groups, the aperture of the lower side smoke hole 1211 is larger than the aperture of the upper side side smoke hole 1211, which is conducive to controlling the relationship between the total ventilation areas of the side smoke holes 1211 in two adjacent smoke hole groups.

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

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

[0068] like Figure 4 、 Figure 5 and Figure 7 As shown, in one embodiment, a bottom plate portion 113 is connected between the lower end of the inner cylinder portion 111 and the lower end of the inner cylinder portion 111. The bottom plate portion 113 seals the lower ends of the inner ring smoke chamber 14 and the outer ring smoke chamber 15. The lower end of the partition cylinder portion 121 is arranged higher than the bottom plate portion 113, so that the gap between the partition cylinder portion 121 and the bottom plate portion 113 forms a communication channel, and the lower end of the inner ring smoke chamber 14 and the lower end of the outer ring smoke chamber 15 are connected through the communication channel. This arrangement can simplify the processing of the intermediate cylinder 12, and is conducive to the recovery of condensed water and the arrangement of the condensation assembly 3 between the inner cylinder 11 and the outer cylinder 13. In other embodiments, the lower end of the partition cylinder portion 121 can also abut against the bottom plate portion 113, and the lower end side wall of the partition cylinder portion 121 is provided with a communication channel connecting the inner ring smoke chamber 14 and the outer ring 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 inwardly to the lower side of the inner cylinder portion 111. In yet another embodiment, the bottom plate portion 113 may also be provided as a separate body from the inner cylinder portion 111 and the outer cylinder portion 131 and welded or detachably connected thereto.

[0070] To enhance the stability and convenience of assembling the outer cylinder 13 and inner cylinder 11, the flange 132 of the outer cylinder 13 is aligned and connected to the bottom plate 113. This increases the contact area between the outer cylinder 13 and the inner cylinder 11, ensuring a secure connection between them. Preferably, the flange 132 and the bottom plate 113 are welded together, resulting in a rigid, airtight structure for the smoke guide assembly 1.

[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 and sleeved outside the inner condenser tube 31a. Each condenser tube 31 comprises two bent, connected half-segments. Each half-segment has multiple spiral segments 311 spirally wound from top to bottom at the junction of the two halves. The spiral segments 311 of the two half-segments are staggered from top to bottom, and the ends of the two lowermost spiral segments 311 form a water inlet and a water outlet, respectively.

[0072] Since the condenser 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 pipe section, and the other half-pipe section is the water outlet pipe section, the spiral pipe section 311 on the water inlet pipe section is the water inlet spiral section 311a, and the spiral pipe section 311 on the water outlet pipe 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 31 are staggered from top to bottom.

[0073] That is, the above-mentioned setting makes the connection point of one relative half-segment of the two adjacent spiral pipe sections 311 in the vertical direction the water inlet flow, and the other is the water outlet flow, which is beneficial to ensure the temperature consistency of various parts of the condenser 31, improve the preheating effect, and improve the heat exchange effect between the water flow and the flue gas in the condenser 31; at the same time, this setting makes the water inlet port and the water outlet port both set at the lower end of the condenser 31, thereby facilitating the pipeline connection between the condenser 31 and the heat exchanger; furthermore, this setting can reduce the radial space occupied by the condenser 31, thereby reducing the width requirement of the inner ring smoke chamber 14 and the outer ring smoke chamber 15.

[0074] In order to improve the pipeline connection between the condensing assembly 3 and the heat exchanger, the condensing assembly 3 also includes an inlet pipe portion 32 and an outlet pipe portion 33. One end of the inlet pipe portion 32 and the outlet pipe portion 33 are located between the inner cylinder portion 111 and the outer cylinder portion 131, and the other end extends out of the outer cylinder portion 131. The water inlet ends of the two condensing pipes 31 are connected to the inlet pipe portion 32, and the water outlet ends of the two condensing pipes 31 are connected to the outlet pipe portion 33. This arrangement allows the water entering the inlet pipe portion 32 to flow to the two condensing pipes 31 respectively, and after heat exchange and temperature increase in the two condensing pipes 31, it converges to the outlet pipe portion 33 and flows out through the outlet pipe portion 33. This arrangement means that the condensing heat exchange device has only two ports for connecting to the heat exchanger, simplifying the installation of the condensing heat exchange device.

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

[0076] In one embodiment, the outer cylinder 131 is provided with an escape hole 1312, through which the water inlet pipe 32 and the water outlet pipe 33 respectively pass. To prevent smoke from escaping through the escape hole 1312, the condensing heat exchange device further includes a blocking member 4, which is sealedly mounted in the escape hole 1312. The blocking member 4 has two insertion holes, into which the water inlet pipe 32 and the water outlet pipe 33 are interference-fitted. The blocking member 4 is made of rubber. This facilitates the extension of the water inlet pipe 32 and the water outlet pipe 33 from the outer cylinder 131 while ensuring a sealed seal after assembly, preventing smoke leakage.

[0077] like Figure 10 As shown, since the flue gas is condensed to form condensed water when flowing through the condenser tube 31, in order to collect and discharge the condensed water, the inner cylinder portion 111, the outer cylinder portion 131 and the bottom plate portion 113 are surrounded to form a water collecting trough 16. The water collecting trough 16 is connected to the lower ends of the outer ring smoke chamber 15 and the inner ring smoke chamber 14. The condensed water formed by the partial condensation of the flue gas drips into the water collecting trough 16 and is collected.

[0078] To drain condensed water, the condensing heat exchanger further 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 and passes through the outer tube 131 through a drain port 1313 on the outer tube 131. The second end of the drain connector 5 is higher than the first end of the drain connector 5. This arrangement ensures that the condensed water in the water collection tank 16 submerges the first end of the drain connector 5 and reaches the height of the second end of the drain connector 5 before drainage occurs. This ensures that the first end of the drain connector 5 is always sealed by water, thereby preventing smoke from being discharged through the drain connector 5 and the drain pipe.

[0079] The drainage connector 5 is preferably an L-shaped elbow connector, one end of which is vertically arranged to be inserted into the water collection tank 16 , and the other end of which extends horizontally and passes through the outer cylinder 131 .

[0080] In the specific contents of the above-mentioned specific embodiments, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The specific contents of the above-mentioned specific embodiments only express several implementation methods of the utility model. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent of this utility model. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, several variations and improvements can be made, which all fall within the scope of protection of the utility model. Therefore, the scope of protection of the utility model patent shall be based on the attached claims.

Claims

1. A condensation heat exchange device, characterized in that: include: A smoke collecting hood (2) having a smoke collecting cavity (23); A smoke guide tube group (1) is installed at the upper end of the smoke hood (2), and the smoke guide tube group (1) includes an inner tube part (111), a separating tube part (121) and an outer tube part (131) which are sequentially spaced from the inside to the outside. The inner side of the inner tube part (111) has a smoke inlet cavity (114) whose lower end is connected to the smoke collection cavity (23). The inner tube part (111) and the separating tube part (121) are surrounded to form an inner ring smoke cavity (14). The inner tube part (111) and the outer tube part (131) are surrounded to form an outer ring smoke cavity (15). The smoke inlet cavity (114) and the 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 provided with a smoke exhaust port (1311), the upper end cavity wall of the smoke inlet chamber (114) is provided with a plurality of top smoke holes (1221) connecting the smoke exhaust port (1311) and the smoke inlet chamber (114), and / or the partition cylinder (121) is provided with a plurality of side smoke holes (1211) connecting the inner ring smoke chamber (14) and the outer ring smoke chamber (15); The condensation assembly (3) comprises two condensation pipes (31) respectively coiled in the inner ring smoke chamber (14) and the outer ring smoke chamber (15), wherein the condensation pipes (31) are used for introducing cold water.

2. The condensing heat exchange device according to claim 1, characterized in that: The partition cylinder (121) is provided with a plurality of smoke hole groups spaced apart in the vertical direction, and each of the smoke hole groups comprises a plurality of side smoke holes (1211) spaced apart along the circumference of 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 condensing heat exchange device according to claim 1, characterized in that: The upper end side wall of the inner cylinder (111) is provided with a plurality of communication openings (1111), and the inner ring smoke chamber (14) is connected with the smoke inlet chamber (114) through the communication openings (1111). The total ventilation area of all the communication openings (1111) is S1, and the total ventilation area of all the top smoke outlet holes (1221) is S2, where S1 ≥ 5*S2; And / or, the smoke inlet cavity (114) is a cylindrical cavity, and the smoke outlet holes (1221) are arranged in multiple groups at intervals around the axis of the cylindrical cavity, and each group of the smoke outlet holes (1221) includes multiple smoke outlet holes (1221) arranged at intervals along the radial direction of the cylindrical cavity.

4. The condensing heat exchange device according to claim 1, characterized in that: The top end of the separating cylinder (121) is connected to a top plate (122), and the top plate (122) 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), and the top plate (122) is provided with the top smoke outlet hole (1221).

5. The condensing heat exchange device according to claim 1, characterized in that: A bottom plate portion (113) is provided between the lower end of the inner cylinder portion (111) and the lower end of the outer cylinder portion (131), and the bottom plate portion (113) closes the lower ends of the inner ring smoke chamber (14) and the outer ring smoke chamber (15). The lower end of the separating cylinder portion (121) is higher than the bottom plate portion (113), and a connecting passage connecting the inner ring smoke chamber (14) and the outer ring smoke chamber (15) is formed between the lower end of the separating cylinder portion (121) and the bottom plate portion (113).

6. The condensing heat exchange device according to any one of claims 1 to 5, characterized in that: The condenser pipe (31) comprises two bent and connected half-pipe sections, each of the half-pipe sections is spirally wound with a plurality of spiral pipe sections (311) from top to bottom at the connection point of the two half-pipe sections, the spiral pipe sections (311) of the two half-pipe sections are staggered from top to bottom, and the end openings of the two spiral pipe sections (311) at the bottom respectively form a water inlet port and a water outlet port; And / or, the condenser (31) further includes a water inlet pipe portion (32) and a water outlet pipe portion (33), the water inlet ends of the two condenser pipes (31) are connected to the water inlet pipe portion (32), the water outlet ends of the two condenser pipes (31) are connected to the water outlet pipe portion (33), and the water inlet pipe portion (32) and the water outlet pipe portion (33) both pass through the outer cylinder portion (131).

7. The condensing heat exchange device 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), and 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 exchange device according to any one of claims 1 to 5, characterized in that: A bottom plate portion (113) is connected between the lower end of the inner cylinder portion (111) and the lower end of the outer cylinder portion (131); the lower end of the partition cylinder portion (121) is higher than the bottom plate portion (113); the inner cylinder portion (111), the outer cylinder portion (131) and the bottom plate portion (113) are combined to form a water collecting trough (16); the water collecting trough (16) is in communication with the lower ends of the outer ring smoke chamber (15) and the inner ring smoke chamber (14); The condensing heat exchange device further comprises a drainage joint (5), a first end of the drainage joint (5) being inserted into the water collecting tank (16) and a second end being sealed and passing through the outer cylinder (131), and the second end of the drainage joint (5) being higher than the first end of the drainage joint (5).

9. The condensing heat exchange device according to any one of claims 1 to 5, characterized in that: A top through hole (212) is provided on the top of the smoke hood (2), the outer tube portion (131) is inserted into the top through hole (212), and a flange portion (132) extends outward from the periphery of the outer tube portion (131), and the flange portion (132) is attached to and connected to the inner wall of the smoke hood (2).

10. A gas water heater, comprising a heat exchanger, wherein the water inlet end of the heat exchanger is connected to a water inlet pipe, characterized in that: It also includes the condensing heat exchange device according to any one of claims 1 to 9, wherein the smoke hood (2) is arranged above the heat exchanger, and both ends of the condensing pipe (31) are connected in series to the water inlet pipe.

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