Condensing heat exchange device and gas water heater

Abstract

This utility model belongs to the technical field of hot water equipment, specifically disclosing a condensing heat exchange device and a gas water heater. The gas water heater includes a condensing heat exchange device, which comprises a condensing shell and at least one condensing tube. The condensing shell has a first flue gas inlet, a flue gas outlet, a first fixing hole, and a second fixing hole. The condensing tube is located inside the condensing shell, and its inlet and outlet ends are respectively fixed to the first and second fixing holes. The condensing tube has a tortuous structure. Multiple first limiting protrusions are arranged around the condensing tube on the inner wall of the condensing shell to circumferentially limit the condensing tube. The condensing heat exchange device and the condensing tube in the gas water heater are not prone to leakage and have good heat exchange effect.

Description

Technical Field

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

[0002] Water heaters are common household appliances. They are categorized into gas water heaters and electric water heaters, with gas water heaters being widely used due to their convenience. Existing gas water heaters typically involve two heat exchange devices for secondary heat exchange. First, the high-temperature flue gas produced by the burner exchanges heat with the main heat exchange device, forming medium-temperature flue gas that is still relatively hot. To fully utilize the heat energy in this medium-temperature flue gas, the gas water heater also includes a condensing heat exchange device. The medium-temperature flue gas then exchanges heat a second time with this condensing heat exchange device before being discharged.

[0003] The condensing heat exchange device includes a condensing shell and a condensing tube. When the water pressure of the water entering the condensing tube fluctuates greatly, the condensing tube will shake repeatedly and make noise, and may even be damaged and leak. Moreover, the distance between the condensing tube and the condensing shell is large, and the flue gas entering the condensing shell is easy to be discharged from the exhaust port without contacting the condensing tube, resulting in low heat exchange efficiency and thus low heat exchange efficiency of the gas water heater. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a condensing heat exchange device that can solve the problems of condensing tube vibration when water pressure fluctuates greatly and low heat exchange efficiency of the condensing heat exchange device.

[0005] The second technical problem solved by this utility model is to provide a gas water heater that can solve the problems of condenser tube vibration when water pressure fluctuates greatly and low heat exchange efficiency of gas water heaters.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A condensing heat exchange device includes a condensing shell and condensing tubes. The condensing shell has a first flue gas inlet, a flue gas outlet, a first fixing hole, and a second fixing hole. At least one condensing tube is located inside the condensing shell. The inlet end of the condensing tube is fixed to the first fixing hole, and the outlet end of the condensing tube is fixed to the second fixing hole. The condensing tube has a tortuous structure. Multiple first limiting protrusions are provided around the condensing tube on the inner wall of the condensing shell to circumferentially limit the condensing tube.

[0008] Compared with the prior art, the condensing heat exchange device of this utility model has the following advantages: the condensing heat exchange device uses multiple first limiting protrusions set on the condensing shell to circumferentially limit the condensing tube, which reduces the possibility of water leakage caused by the shaking of the condensing tube when the water pressure fluctuates greatly. Moreover, the first limiting protrusions can guide the flue gas, so that the flue gas and the condensing tube can fully exchange heat, thereby improving the heat exchange efficiency of the condensing heat exchange device.

[0009] In one embodiment, the condenser tube includes at least two straight tube sections and a bent tube section connecting multiple straight tube sections in series, the straight tube sections being arranged parallel to the axis of the first fixing hole.

[0010] In one embodiment, the condenser housing includes an upper positioning plate, a lower positioning plate, and a surrounding plate. The upper and lower positioning plates are spaced apart vertically, and the surrounding plate is disposed between the upper and lower positioning plates and cooperates with the upper and lower positioning plates to form a receiving cavity for accommodating the condenser tube. The first fixing hole and the second fixing hole are both disposed on the surrounding plate, and the upper positioning plate, the lower positioning plate, and the surrounding plate are all provided with the first limiting protrusion.

[0011] In one embodiment, the enclosure includes a front panel, a rear panel, a left panel, and a right panel. The first limiting protrusion is disposed on the front panel and the rear panel. The first fixing hole and the second fixing hole are disposed on the left panel. The front panel, the right panel, and the rear panel are connected to form a U-shaped structure. The left panel is separately disposed from the U-shaped structure and fixedly connected.

[0012] In one embodiment, the condenser housing is further provided with a second limiting protrusion, which is disposed on the enclosure and located between the gaps formed by two adjacent straight pipe sections of the same condenser pipe.

[0013] In one embodiment, the first smoke inlet is disposed on the upper positioning plate, and a plurality of first smoke inlets are spaced apart along the length direction of the straight pipe to form a first smoke inlet group, and any straight pipe section in the uppermost condenser tube is correspondingly provided with the first smoke inlet group.

[0014] In one embodiment, the exhaust port is disposed on the enclosure, and the central axis of the first smoke inlet group extending along the length direction of the straight pipe section is offset away from the central axis of the corresponding straight pipe section in a direction away from the exhaust port; and / or,

[0015] The area of ​​the first smoke inlet in the first smoke inlet group that is furthest from the exhaust outlet is greater than the area of ​​the first smoke inlet in other first smoke inlet groups.

[0016] In one embodiment, along a direction that gradually approaches the exhaust port, the distance by which the central axis of the plurality of first smoke inlet groups extends along the length direction of the straight pipe portion deviates from the central axis of the corresponding straight pipe portion in a direction away from the exhaust port gradually decreases.

[0017] In one embodiment, the area of ​​the first smoke inlet in the plurality of first smoke inlet groups decreases sequentially along the direction gradually approaching the smoke exhaust port.

[0018] In one embodiment, each of the first smoke inlets has the same length along the length of the straight pipe section, and the width of the first smoke inlets in the plurality of first smoke inlet groups decreases sequentially along the direction gradually approaching the smoke exhaust port.

[0019] In one embodiment, the lower positioning plate is provided with a condensate drain outlet.

[0020] In one embodiment, the lower positioning plate is further provided with a flow guiding recess, and the condensate drain outlet is disposed in the flow guiding recess.

[0021] In one embodiment, the exhaust port is disposed on the lower positioning plate, and the central axis of the first exhaust port coincides with the central axis of the uppermost condenser tube; and / or, a plurality of exhaust ports spaced apart along the length of the straight tube section form an exhaust port group, and the plurality of exhaust port groups are disposed in one-to-one correspondence with each of the straight tube sections in the lowermost condenser tube, and the central axis of the exhaust port coincides with the central axis of the lowermost condenser tube.

[0022] In one embodiment, the first limiting protrusion is integrally stamped and formed, and a condensate inlet hole is provided in the first limiting protrusion disposed on the upper positioning plate.

[0023] In one embodiment, multiple condenser tubes are spaced apart in the vertical direction.

[0024] In one embodiment, a distribution plate is provided between the condenser tubes arranged vertically adjacent to each other, and the distribution plate has multiple distribution holes.

[0025] The second technical problem mentioned above is solved by the following technical solution:

[0026] A gas water heater includes a main heat exchange device and a condensing heat exchange device as described above, wherein the main heat exchange device is connected to the condensing shell through the first flue gas inlet.

[0027] Compared with the prior art, the gas water heater of this utility model has the following advantages: the multiple first limiting protrusions set on the condenser shell can circumferentially limit the condenser tube, reducing the possibility of water leakage caused by the condenser tube shaking when the water pressure fluctuates greatly. Moreover, the first limiting protrusions can guide the flue gas, so that the flue gas and the condenser tube can fully exchange heat, thereby improving the heat exchange efficiency of the condenser heat exchange device. Attached Figure Description

[0028] Figure 1 This is an exploded structural diagram of the condensation heat exchange device provided in Embodiment 1 of this utility model;

[0029] Figure 2 This is a cross-sectional view of the condensation heat exchange device provided in Embodiment 1 of this utility model;

[0030] Figure 3 This is a top view of the condensation heat exchange device provided in Embodiment 1 of this utility model;

[0031] Figure 4 This is a schematic diagram of the upper positioning plate provided in Embodiment 1 of this utility model;

[0032] Figure 5 This is a cross-sectional view of the condensation heat exchange device provided in Embodiment 2 of this utility model;

[0033] Figure 6 This is a schematic diagram of the upper positioning plate provided in Embodiment 2 of this utility model.

[0034] Label Explanation:

[0035] 1. Condenser housing; 11. Upper positioning plate; 111. Upper limit part; 12. Lower positioning plate; 121. Lower limit part; 122. Guide recess; 13. Enclosure plate; 131. Front side plate; 132. Rear side plate; 133. Left side plate; 134. Right side plate; 135. First fixing hole; 136. Second fixing hole; 14. First limiting protrusion; 15. Second limiting protrusion; 16a. First smoke inlet; 16b. Second smoke inlet; 16c. Third smoke inlet; 17. Smoke outlet; 18. Condensate inlet hole; 19. Condensate drain hole; 2. Condenser pipe; 21. Straight pipe part; 22. Bend pipe part; 3. Adapter joint; 31. Merging part; 32. Connecting part; 4. Distribution plate; 41. Distribution hole. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In condensing heat exchangers, condenser tubes are typically fixed to the condenser shell by welding. To reduce the number of welds between the condenser tubes and the condenser shell, thereby reducing the possibility of leakage of fluids such as water within the condenser tubes, the condenser tubes in condensing heat exchangers are usually serpentine or spiral tubes. The inlet and outlet ends of the condenser tubes are fixed to two welds on opposite axes of the condenser shell, achieving a fixed connection. However, to simplify the installation of the condenser tubes into the condenser shell, the internal space of the condenser shell is usually larger than the overall volume of the condenser tubes. This can lead to significant fluctuations in the water pressure flowing into the condenser tubes, causing them to vibrate repeatedly and produce noise. In severe cases, this can even damage the tubes and cause leaks.

[0041] Based on this, embodiments of the present invention provide a condensing heat exchange device and a gas water heater having the condensing heat exchange device to solve the above problems.

[0042] Example 1

[0043] refer to Figures 1-4 As shown, this embodiment proposes a condensation heat exchange device, including a condenser shell 1 and at least one condenser tube 2 disposed within the condenser shell 1. The condenser shell 1 has a first flue gas inlet 16a, a flue gas outlet 17, at least one first fixing hole 135, and at least one second fixing hole 136. The inlet end of the condenser tube 2 is fixed to the first fixing hole 135 by a method not limited to welding, and the outlet end of the condenser tube 2 is fixed to the second fixing hole 136 by a method not limited to welding. The first fixing holes 135 and the second fixing holes 136 are arranged in pairs, and their number is the same as the number of condenser tubes 2. The condenser tube 2 has a tortuous structure, and a plurality of first limiting protrusions 14 are provided around the condenser tube 2 on the inner wall surface of the condenser shell 1 to circumferentially limit the condenser tube 2.

[0044] The aforementioned condensing heat exchange device utilizes multiple first limiting protrusions 14 disposed on the condensing shell 1 to circumferentially limit the condensing tube 2, reducing the possibility of water leakage caused by the vibration of the condensing tube 2 when the water pressure fluctuates greatly. Furthermore, the first limiting protrusions 14 can guide the flow of flue gas, ensuring sufficient heat exchange between the flue gas and the condensing tube 2, thus improving the heat exchange efficiency of the condensing heat exchange device. It can be understood that the circumferential limitation of the condensing tube 2 by the first limiting protrusions 14 can be achieved by the first limiting protrusions 14 abutting against the condensing tube 2, or by the provision of the first limiting protrusions 14 reducing the vibration amplitude of the condensing tube 2, thereby reducing the possibility of water leakage; that is, the first limiting protrusions 14 may not need to contact the condensing tube 2. In the current embodiment, the first limiting protrusions 14 abut against the condensing tube 2 to limit the vibration of the condensing tube 2 as much as possible. The condensing tube 2 can be formed by bending a smooth tube or a corrugated tube; no specific limitation is made here.

[0045] There are various specific forms for the meandering condenser tube 2, including but not limited to serpentine tube structures, spiral tube structures, etc. For example, the condenser tube 2 can be a long metal tube that is bent multiple times to form a serpentine tube that meanders back and forth between the two side walls of the condenser shell 1. In this case, both ends of the condenser tube 2 can face the same side of the condenser shell 1, and correspondingly, the first fixing hole 135 and the second fixing hole 136 are located on the same side of the condenser shell 1. Alternatively, the two ends of the condenser tube 2 can face different sides of the condenser shell 1, and correspondingly, the first fixing hole 135 and the second fixing hole 136 are located on different sides of the condenser shell 1.

[0046] Specifically, the condenser tube 2 includes a straight tube section 21 and a bent tube section 22. There are at least two straight tube sections 21. The straight tube sections 21 are arranged parallel to the axis of the first fixing hole 135. The ends of two adjacent straight tube sections 21 are connected in series through the bent tube section 22, so that the condenser tube 2 as a whole is in a meandering serpentine shape.

[0047] Specifically, the condenser housing 1 includes an upper positioning plate 11, a lower positioning plate 12, and a surrounding plate 13. The upper positioning plate 11 and the lower positioning plate 12 are spaced apart vertically, and the surrounding plate 13 is a square cylindrical structure with openings at both the top and bottom. The surrounding plate 13 is positioned between the upper positioning plate 11 and the lower positioning plate 12 and, together with the upper positioning plate 11 and the lower positioning plate 12, forms a receiving cavity for accommodating the condenser tubes 2. A first fixing hole 135 and a second fixing hole 136 are provided on the surrounding plate 13. The upper positioning plate 11, the lower positioning plate 12, and the surrounding plate 13 are all provided with a first limiting protrusion 14 to circumferentially limit the condenser tubes 2.

[0048] The upper positioning plate 11, lower positioning plate 12, and surrounding plate 13 are connected by a method not limited to welding. To reduce assembly difficulty, an upper limit portion 111 protruding downwards towards the lower positioning plate 12 is formed at the center of the upper positioning plate 11, and the surrounding plate 13 is fitted onto the upper limit portion 111. Simultaneously, a lower limit portion 121 protruding upwards towards the upper positioning plate 11 is formed on the lower positioning plate 12, and the surrounding plate 13 is fitted onto the lower limit portion 121. More specifically, both the upper limit portion 111 and the lower limit portion 121 are stamped. A first limiting protrusion 14 on the upper positioning plate 11 is disposed on the upper limit portion 111, and a first limiting protrusion 14 on the lower positioning plate 12 is disposed on the lower limit portion 121. It is understood that the upper limit portion 111 and the lower limit portion 121 also enhance the structural strength of the upper positioning plate 11 and the lower positioning plate 12. The structural strength of the surrounding plate 13 can also be strengthened by forming grooves through stamping.

[0049] The enclosure 13 includes a front side panel 131, a rear side panel 132, a left side panel 133, and a right side panel 134. In the current embodiment, the straight tube 21 extends in the left-right direction. The first limiting protrusion 14 on the enclosure 13 is provided on the front side panel 131 and the rear side panel 132, while the first fixing hole 135 and the second fixing hole 136 are provided on the left side panel 133 and / or the right side panel 134.

[0050] To reduce the assembly difficulty of the condenser tube 2 and to fully utilize the space on the same side of the condenser heat exchanger, in this embodiment, the first fixing hole 135 and the second fixing hole 136 are both located on the left side plate 133. In this case, the inlet and outlet ends of the condenser tube 2 are on the same side. The front side plate 131, the right side plate 134, and the rear side plate 132 cooperate to form a U-shaped structure. The left side plate 133 is separately disposed from the U-shaped structure and connected to the U-shaped structure in a manner not limited to welding to form a square cylindrical structure. It is understood that the aforementioned U-shaped structure can be integrally formed or processed separately and then connected, while the first limiting protrusion 14 is integrally stamped. For example, the protrusion height A of the first limiting protrusion 14 is 1mm-5mm.

[0051] When the condenser tube 2 is assembled into the condenser shell 1, it can be placed inside the U-shaped structure first, and then the upper positioning plate 11, lower positioning plate 12, and left side plate 133 can be assembled onto the U-shaped structure. The inlet and outlet ends of the condenser tube 2 are fixed to the first fixing hole 135 and the second fixing hole 136, respectively. Compared with the related technology in which the condenser tube 2 is placed obliquely to be assembled into the stretched condenser shell 1, the required distance between the condenser tube 2 and the condenser shell 1 is smaller, the condenser tube 2 is less prone to vibration, and the flue gas can more easily contact the condenser tube 2, thus further improving the heat exchange efficiency.

[0052] In the current embodiment, to achieve effective heat exchange, condenser tubes are spaced apart in the vertical direction to form a condenser tube group. Furthermore, to maximize the contact area between the flue gas and the condenser tubes 2 in the condenser tube group, the upper and lower condenser tubes 2 are staggered.

[0053] For example, based on the premise that the condenser tube includes a straight tube section 21 and a bent tube section 22, the orthographic projection of the straight tube section 21 of the lower condenser tube 2 towards the upper condenser tube 2 falls within the gap formed by two adjacent straight tube sections 21 of the upper condenser tube 2. Clearly, since the first limiting protrusion 14 provided on the front side plate 131 and the first limiting protrusion 14 provided on the rear side plate 132 do not simultaneously abut against the same condenser tube 2, the difficulty of assembling the condenser tube 2 into the condenser housing 1 is further reduced. It is worth emphasizing that the condenser tubes 2 arranged adjacent to each other can achieve mutual restraint through friction, thereby reducing the possibility of the condenser tube 2 vibrating towards the side without the first limiting protrusion 14.

[0054] Specifically, the first limiting protrusions 14 located on the front side plate 131 and the rear side plate 132 are configured as strips extending in the vertical direction to simultaneously limit multiple condenser tubes 2 and reduce the processing difficulty of the first limiting protrusions 14. Furthermore, multiple first limiting protrusions 14 are spaced apart on the front side plate 131 or the rear side plate 132 along the length direction of the straight tube portion 21 to improve the limiting effect on the condenser tubes 2. Similarly, the upper positioning plate 11 is provided with multiple first limiting protrusion groups corresponding one-to-one with the straight tube portion 21 of the uppermost condenser tube 2, and each first limiting protrusion group includes multiple first limiting protrusions 14 spaced apart along the length direction of the straight tube portion 21.

[0055] refer to Figure 2 As shown, the condenser tube 2 includes 6 straight tube sections 21 and 5 bent tube sections 22, and the upper positioning plate 11 is provided with 6 sets of first limiting protrusions. There are 5 of these protrusions spaced vertically on the condenser tube 2.

[0056] Based on the premise that the condenser tube 2 adopts a serpentine tube, the condenser shell 1 is also provided with a second limiting protrusion 15. The second limiting protrusion 15 is provided on the left side plate 133 and the right side plate 134, and is located between the gaps formed by two adjacent straight tube sections 21, so as to further limit the condenser tube 2 in the direction perpendicular to the straight tube section 21.

[0057] The condensing heat exchanger also includes a conversion joint 3 disposed outside the condensing shell 1. There are two conversion joints 3, one for connecting the inlet ends of multiple condensing tubes 2 and the other for connecting the outlet ends of multiple condensing tubes 2. Specifically, the conversion joint 3 includes a manifold 31 and a connecting part 32. The manifold 31 is fixedly covered outside the first fixing hole 135 of the multiple condensing tubes 2 or the second fixing hole 136 of the multiple condensing tubes 2. One end of the connecting part 32 is connected to the manifold 31, and the other end is used to connect to an external pipeline.

[0058] In the current embodiment, the first flue gas inlet 16a is disposed on the upper positioning plate 11. In this case, the condensing heat exchange device in this embodiment is located at the bottom of the main heat exchange device when applied to the gas heat exchanger. To prevent water accumulation in the first limiting protrusion 14 on the upper positioning plate 11 when the condensate formed in the main heat exchanger flows down, a condensate inlet hole 18 is provided in the first limiting protrusion 14. Furthermore, the first limiting protrusion 14 on the upper positioning plate 11 can be circular to allow condensate to quickly enter the condensing shell 1 through the condensate inlet hole 18.

[0059] refer to Figure 4As shown, to improve air intake efficiency, multiple first smoke inlets 16a are provided on the upper positioning plate 11. Specifically, multiple first smoke inlets 16a are spaced apart along the length of the straight pipe section 21 to form a first smoke inlet group, and any straight pipe section 21 in the uppermost condenser pipe 2 is provided with a corresponding first smoke inlet group. More specifically, the first smoke inlet 16a is configured as a strip-shaped hole extending along the length of the straight pipe section 21.

[0060] Continue to refer to Figure 4 As shown, the upper positioning plate 11 is also provided with a second smoke inlet 16b and a third smoke inlet 16c. Both the second smoke inlet 16b and the third smoke inlet 16c are located on the upper positioning plate 11. Multiple second smoke inlets 16b spaced apart along the length of the straight pipe section 21 form a second smoke inlet group. A second smoke inlet group is provided between each adjacent group of first smoke inlets. The area of ​​the second smoke inlet 16b is smaller than the area of ​​the first smoke inlet 16a. Multiple third smoke inlets 16c spaced apart along the width of the straight pipe section 21 form a third smoke inlet group. Two third smoke inlet groups are located on opposite sides of the upper positioning plate 11 along the length of the straight pipe section 21. The placement of the second smoke inlets 16b and the third smoke inlets 16c is to increase the ventilation area of ​​the condenser shell 1 and reduce the flue gas resistance. It can be understood that the downward projection of the second smoke inlets 16b and the third smoke inlets 16c both fall on the condenser pipe 2.

[0061] In the current embodiment, the exhaust port 17 is disposed on the enclosure plate 13. To prevent the flue gas from bypassing the condenser pipe below, the exhaust port 17 is located at one end of the enclosure plate 13 near the lower positioning plate 12. It is understood that the air pressure around the side of the first inlet port 16a away from the exhaust port 17 is greater than the air pressure around the side closer to the exhaust port 17. To ensure uniform heat exchange, the central axis of the first inlet port group extending along the length direction of the straight pipe section 21 is deviated from the central axis of the corresponding straight pipe section 21 by a certain distance B in the direction away from the exhaust port 17, so as to prevent the flue gas from flowing directly towards the exhaust port 17 without passing through the condenser pipe 2.

[0062] Specifically, based on the premise that the same condenser pipe 2 includes 6 straight pipe sections 21, the first flue gas inlet group is also provided with 6 groups. Along the direction gradually approaching the flue gas outlet 17, let the distances of the central axis of the first flue gas inlet group extending along the length of the straight pipe section 21 away from the central axis of the corresponding straight pipe section 21 (hereinafter referred to as the straight pipe section central axis) L in the direction away from the flue gas outlet 17 be B1, B2, B3, B4, B5, B6, where B1 > B2 > B3 > B4 > B5 > B6. More specifically, based on the existing flue gas flow efficiency of gas water heaters and the pipe diameter of the condenser pipe 2, 6mm ≥ B1 > B2 > B3 > B4 > B5 > B6 ≥ 1mm.

[0063] Meanwhile, it is understood that the negative pressure is greater near the first smoke inlet 16a, which is closer to the exhaust port 17, making it easier for smoke to be drawn in. Conversely, the negative pressure is smaller near the first smoke inlet 16a, which is farther from the exhaust port 17, making it less likely for smoke to be drawn in. Therefore, in this embodiment, the area of ​​the first smoke inlet 16a in the group of first smoke inlets furthest from the exhaust port 17 is larger than the area of ​​the first smoke inlet 16a in other groups of first smoke inlets, in order to reduce the resistance of smoke entering the condenser shell 1 from this group of first smoke inlets.

[0064] Furthermore, along the direction that gradually approaches the exhaust port 17, the area of ​​the first smoke inlet 16a in each of the first smoke inlet groups gradually decreases, thereby balancing the amount of flue gas entering the condenser shell 1 from the first smoke inlet 16a at different positions and achieving uniform heat exchange as much as possible.

[0065] In the current embodiment, each first flue gas inlet 16a has the same length along the length of the straight pipe section. Then, along the direction that gradually approaches the exhaust port 17, the widths of the first flue gas inlets 16a in the first flue gas inlet group arranged in sequence are C1, C2, C3, C4, C5, and C6, respectively, where C1 > C2 > C3 > C4 > C5 > C6, in order to further improve the heat exchange uniformity.

[0066] refer to Figure 1 As shown, the lower positioning plate 12 is also provided with a condensate drain outlet 19 to discharge condensate from the condenser housing 1 in a timely manner. To prevent affecting the flow resistance of flue gas, the lower positioning plate 12 is also provided with a flow guide recess 122, and the condensate drain outlet 19 is located in the flow guide recess 122. Specifically, the flow guide recess 122 is also stamped.

[0067] To rationally distribute the flue gas among the multiple vertically spaced condenser tubes 2, a distribution plate 4 is installed between adjacent vertically spaced condenser tubes 2. The distribution plate 4 has multiple distribution holes 41, which further improves the heat exchange efficiency by distributing the flow of flue gas layer by layer. It should be emphasized that, in addition to distributing the flue gas, the distribution plate 4 also supports the condenser tubes 2, further improving the stability of the condenser tubes 2 within the condenser shell 1.

[0068] Specifically, the arrangement of the distribution hole 41 is similar to that of the first smoke inlet 16a. For example, when the first smoke inlet 16a is offset relative to the uppermost condenser tube 2, the distribution hole 41 is offset relative to the condenser tube 2 on one side below the distribution plate 4. As another example, when the area of ​​the first smoke inlet 16a gradually increases in the direction away from the smoke exhaust port 17, the distribution hole 41 gradually increases in the direction away from the smoke exhaust port 17.

[0069] Example 2

[0070] This embodiment also proposes a condensation heat exchange device, referencing... Figure 5 and Figure 6 As shown, unlike the condenser heat exchanger in Embodiment 1, the exhaust port 17 of the condenser heat exchanger in this embodiment is located on the lower positioning plate 12. In this case, to achieve uniform heat exchange, the central axis of the first exhaust port 16a coincides with the central axis of the uppermost condenser tube 2, and the areas of the first exhaust ports 16a on the upper positioning plate 11 are the same or similar. Simultaneously, the exhaust ports 17 are also arranged in groups. Multiple exhaust ports 17 spaced apart along the length of the straight tube section 21 form an exhaust port group. These multiple exhaust port groups correspond one-to-one with each straight tube section 21 in the lowermost condenser tube 2, and the central axis of the exhaust port 17 coincides with the central axis of the lowermost condenser tube 2. Of course, when the condenser tube group includes only one condenser tube 2, the uppermost condenser tube 2 and the lowermost condenser tube 2 are the same.

[0071] Based on the arrangement of the distribution plate 4, the central axis of the distribution hole 41 on the distribution plate 4 also coincides with the central axis of the condenser tube 2. It is worth emphasizing that the distribution hole 41 on the distribution plate 4 includes a first distribution hole 41 facing the condenser tube 2 above the distribution plate 4 and a second distribution hole 41 facing the condenser tube 2 below the distribution plate 4.

[0072] Example 3

[0073] This embodiment proposes a gas water heater, including the condensing heat exchange device in Embodiment 1 or Embodiment 2, and also includes a main heat exchange device and a burner. The main heat exchange device includes heat exchange tubes and a heat exchange shell. The heat exchange tubes are at least partially located inside the heat exchange shell. The heat exchange shell connects the burner and the condensing shell 1. The flue gas generated by the burner enters the heat exchange shell and undergoes initial heat exchange with the heat exchange tubes. Then, it enters the condensing shell 1 through the first flue gas inlet 16a and undergoes secondary heat exchange with the condensing tubes 2, thereby achieving full absorption of heat in the flue gas.

[0074] Since the gas water heater includes the aforementioned condensing heat exchange device, it has the advantages of the condenser tube 2 being less prone to vibration or having a smaller vibration amplitude and high heat exchange efficiency.

[0075] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0076] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A condensing heat exchanger, characterized in that, include: The condenser housing (1) is provided with a first smoke inlet (16a), a smoke outlet (17), at least one first fixing hole (135) and at least one second fixing hole (136). At least one condenser tube (2) is located inside the condenser housing (1), the inlet end of the condenser tube (2) is fixed in the first fixing hole (135), the outlet end of the condenser tube (2) is fixed in the second fixing hole (136), and the condenser tube (2) has a meandering structure. The inner wall of the condenser housing (1) is provided with a plurality of first limiting protrusions (14) surrounding the condenser tube (2) to limit the condenser tube (2) circumferentially.

2. The condensation heat exchanger according to claim 1, characterized in that, The condenser tube (2) includes at least two straight tube sections (21) and a bent tube section (22) that connects multiple straight tube sections (21) in series. The straight tube sections (21) are arranged parallel to the axis of the first fixing hole (135).

3. The condensing heat exchanger of claim 2, wherein The condenser housing (1) includes an upper positioning plate (11), a lower positioning plate (12), and a surrounding plate (13). The upper positioning plate (11) and the lower positioning plate (12) are spaced apart vertically. The surrounding plate (13) is disposed between the upper positioning plate (11) and the lower positioning plate (12) and cooperates with the upper positioning plate (11) and the lower positioning plate (12) to form a receiving cavity for accommodating the condenser tube (2). The first fixing hole (135) and the second fixing hole (136) are disposed on the surrounding plate (13). The upper positioning plate (11), the lower positioning plate (12), and the surrounding plate (13) are all provided with the first limiting protrusion (14).

4. The condensation heat exchanger according to claim 3, characterized in that, The enclosure (13) includes a front side panel (131), a rear side panel (132), a left side panel (133), and a right side panel (134). The first limiting protrusion (14) is disposed on the front side panel (131) and the rear side panel (132). The first fixing hole (135) and the second fixing hole (136) are both disposed on the left side panel (133). The front side panel (131), the right side panel (134), and the rear side panel (132) are connected to form a U-shaped structure. The left side panel (133) is separately disposed from the U-shaped structure and fixedly connected.

5. The condensing heat exchanger of claim 3, wherein The condenser housing (1) is also provided with a second limiting protrusion (15), which is provided on the enclosure plate (13) and located between the gaps formed by two adjacent straight pipe sections (21) of the same condenser pipe (2).

6. The condensation heat exchanger according to claim 3, characterized in that, The first smoke inlet (16a) is disposed on the upper positioning plate (11). Multiple first smoke inlets (16a) are arranged at intervals along the length direction of the straight pipe section (21) to form a first smoke inlet group. Any straight pipe section (21) in the uppermost condenser pipe (2) is correspondingly provided with the first smoke inlet group.

7. The condensation heat exchanger according to claim 6, characterized in that, The exhaust port (17) is disposed on the enclosure (13), and the central axis of the first smoke inlet group extending along the length direction of the straight pipe section (21) is offset from the central axis of the corresponding straight pipe section (21) in a direction away from the exhaust port (17); and / or, The area of ​​the first smoke inlet (16a) in the first smoke inlet group that is furthest from the exhaust port (17) is greater than the area of ​​the first smoke inlet (16a) in the other first smoke inlet groups.

8. The condensing heat exchanger of claim 7, wherein Along the direction that gradually approaches the exhaust port (17), the distance by which the central axis of the plurality of first smoke inlet groups extends along the length direction of the straight pipe section (21) deviates from the central axis of the corresponding straight pipe section (21) in the direction away from the exhaust port (17) gradually decreases.

9. The condensation heat exchanger according to claim 7, characterized in that, Along the direction that gradually approaches the exhaust port (17), the area of ​​the first smoke inlet (16a) in the plurality of first smoke inlet groups decreases sequentially.

10. The condensation heat exchanger according to claim 9, characterized in that, Each of the first smoke inlets (16a) has the same length along the length direction of the straight pipe section (21), and the width of the first smoke inlets (16a) in the plurality of first smoke inlet groups decreases sequentially along the direction that gradually approaches the smoke outlet (17).

11. The condensing heat exchanger of claim 7, wherein The lower positioning plate (12) is provided with a condensate drain outlet (19).

12. The condensation heat exchanger according to claim 11, characterized in that, The lower positioning plate (12) is also provided with a flow guiding recess (122), and the condensate drain outlet (19) is provided in the flow guiding recess (122).

13. The condensation heat exchanger according to claim 6, characterized in that, The exhaust port (17) is disposed on the lower positioning plate (12), and the central axis of the first smoke inlet (16a) coincides with the central axis of the uppermost condenser tube (2); and / or, a plurality of exhaust ports (17) spaced apart along the length direction of the straight tube section (21) form an exhaust port group, and the plurality of exhaust port groups are disposed in correspondence with each of the straight tube sections (21) in the lowermost condenser tube (2), and the central axis of the exhaust port (17) coincides with the central axis of the lowermost condenser tube (2).

14. The condensing heat exchanger of claim 3, wherein The first limiting protrusion (14) is integrally stamped and formed, and a condensate inlet hole (18) is provided in the first limiting protrusion (14) on the upper positioning plate (11).

15. The condensing heat exchanger according to any one of claims 1-14, characterized in that, Multiple condenser tubes (2) are spaced apart in the vertical direction.

16. The condensation heat exchanger according to claim 15, characterized in that, A distribution plate (4) is also provided between the condenser tubes (2) arranged vertically and vertically, and the distribution plate (4) has multiple distribution holes (41).

17. A gas-fired water heater, characterized in that, It includes a main heat exchange device and a condensing heat exchange device as described in any one of claims 1-16, wherein the main heat exchange device is connected to the condensing shell (1) through the first flue gas inlet (16a).

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