Condensing heat exchange device and gas water heater
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG VANWARD NEW ELECTRIC CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-07
Smart Images
Figure CN224470441U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas water heater technology, and in particular to a condensing heat exchange device and a gas water heater. Background Technology
[0002] When a condensing gas-fired water heater is in use, the high-temperature flue gas generated by the burner is heat-exchanged by the main heat exchanger, and then condensed by the condensing heat exchanger to condense the water vapor carried in the high-temperature flue gas into liquid. The heat released by the condensation of water vapor and the heat of the flue gas cooling are absorbed by the cold water in the condensing heat exchanger tube, thereby improving energy efficiency.
[0003] In some condensing gas water heaters, to reduce the overall width, the condensing heat exchanger is placed above the main heat exchanger. Condensate from the condensing heat exchanger easily drips from the flue gas inlet onto the main heat exchanger. This condensate is acidic and corrosive, affecting the main heat exchanger and shortening the lifespan of the gas water heater. To prevent condensate from dripping and corroding the main heat exchanger, existing condensing heat exchangers use a partition plate inside the condenser shell. This partition plate divides the condenser shell into a parallel flue gas inlet and a condensing heat exchange chamber. While this prevents condensate from entering the flue gas inlet and dripping onto the main heat exchanger, it reduces the volume of the condensing heat exchange tubes within the condensing heat exchange chamber, given a fixed shell volume. Meanwhile, the flue gas flows out from the flue outlet at the top of the flue into the condensing heat exchange chamber, and flows both downwards and horizontally, exchanging heat with the condensing heat exchange tubes. Finally, it flows out from the flue outlet on the side wall of the condenser shell. However, the heat exchange tubes located in the lower part of the condensing heat exchange chamber have greater flow resistance, resulting in less flue gas flowing through this part, which reduces the heat exchange efficiency of the condensing heat exchange device. Utility Model Content
[0004] The first technical problem solved by this utility model is to provide a condensation heat exchange device that can effectively solve the problem of reduced heat exchange efficiency caused by existing condensation heat exchange devices in order to prevent condensate from corroding the main heat exchange device.
[0005] The second technical problem solved by this utility model is to provide a gas water heater that can effectively solve the problem of reducing the heat exchange efficiency of the condensing heat exchange device in order to extend the service life of existing gas water heaters.
[0006] The first technical problem mentioned above is solved by the following technical solution:
[0007] The shell has a condensation heat exchange chamber. The bottom of the condensation heat exchange chamber has a smoke inlet protrusion extending into the condensation heat exchange chamber. The smoke inlet protrusion has a smoke inlet flue. The two ends of the smoke inlet flue pass through the bottom wall of the shell and the upper surface of the smoke inlet protrusion, respectively.
[0008] A condensing heat exchange tube is disposed inside the condensing heat exchange chamber;
[0009] A condensate baffle is provided, with its fixed end connected to the upper surface of the flue gas inlet protrusion to prevent condensate from the condensing heat exchange tube from dripping into the flue gas inlet. A first flue gas outlet communicating with the flue gas inlet is formed between the front of the condensate baffle and the upper surface of the flue gas inlet protrusion. A flue gas outlet protrusion is provided on the side of the condensate baffle facing away from its front side, and the flue gas outlet protrusion has a flue gas outlet communicating with the flue gas inlet. Along the height direction of the shell, a second flue gas outlet of the flue gas outlet is located in the lower middle part of the condensing heat exchange chamber. The orientation of the second flue gas outlet avoids the direction in which condensate from the condensing heat exchange tube drips.
[0010] The condensation heat exchange device described in this utility model has the following advantages compared with the prior art:
[0011] The condensing heat exchange device provided by this utility model includes a shell, condensing heat exchange tubes, and a condensate baffle. The bottom of the condensing heat exchange chamber has a flue gas inlet protrusion extending into the chamber. The flue gas inlet protrusion has a flue gas inlet channel, with both ends penetrating the bottom wall of the shell and the upper surface of the flue gas inlet protrusion, respectively. This allows high-temperature flue gas to enter from the bottom of the shell along the flue gas inlet channel and flow into the condensing heat exchange chamber through the first and second flue gas outlets, respectively, where it contacts the condensing heat exchange tubes to exchange heat. By providing the flue gas inlet protrusion within the condensing heat exchange chamber and simultaneously installing a condensate baffle on the protrusion to prevent condensate from the condensing heat exchange tubes from dripping into the flue gas inlet channel, the condensing heat exchange tubes can be coiled directly above the flue gas inlet channel, facilitating condensing heat exchange. With a fixed housing volume, more heat exchange tubes can be arranged in the condensing heat exchange chamber, thus improving heat exchange efficiency. Furthermore, since the first and second flue gas outlets are located on both sides of the condensate baffle, it is beneficial for the flue gas to be evenly distributed in the condensing heat exchange chamber after entering from the flue gas inlet. The second flue gas outlet is located in the lower middle part of the condensing heat exchange chamber. The high-temperature flue gas entering through the second flue gas outlet flows to the lower middle part of the condensing heat exchange chamber and exchanges heat with the condensing heat exchange tubes located in the lower middle part of the condensing heat exchange chamber. This increases the amount of high-temperature flue gas in the lower middle part of the condensing heat exchange chamber, so that the condensing heat exchange tubes located in the lower middle part of the condensing heat exchange chamber can also fully contact and exchange heat with the high-temperature flue gas, further improving the heat exchange efficiency of the condensing heat exchange device.
[0012] In one embodiment, the housing includes a first sidewall and a second sidewall disposed opposite to each other along a first horizontal direction, the second sidewall being provided with a smoke exhaust port; the fixed end of the condensate baffle is connected to the upper surface of the smoke inlet protrusion along a second horizontal direction, the free end of the condensate baffle is inclined upward and extends along a direction close to the first sidewall; the smoke outlet protrusion extends along a direction close to the second sidewall.
[0013] In one embodiment, the plane containing the first smoke outlet is parallel to the vertical direction, or the plane containing the first smoke outlet is inclined from bottom to top along the direction close to the first sidewall; and / or, the plane containing the second smoke outlet is parallel to the vertical direction; or the plane containing the second smoke outlet is inclined from bottom to top along the direction close to the second sidewall.
[0014] In one embodiment, the minimum flow area of the smoke inlet duct is 1 to 1.2 times the flow area of the smoke outlet.
[0015] In one embodiment, the central axis of the flue is perpendicular to the surface of the condensate baffle.
[0016] In one embodiment, the smoke-emitting protrusions are evenly distributed at intervals along the second horizontal direction.
[0017] In one embodiment, the projection of the condensate baffle in the horizontal plane coincides with the projection of the plane where the outlet of the flue is located in the horizontal plane.
[0018] In one embodiment, the condensing heat exchange device further includes a smoke collection hood assembly, which includes a smoke collection hood and a smoke baffle. The smoke collection hood is disposed on the top of the condensing heat exchange chamber to close the condensing heat exchange chamber. One end of the smoke baffle is connected to the smoke collection hood, and the other end extends into the condensing heat exchange chamber and extends to the middle and below of the condensing heat exchange chamber.
[0019] The smoke baffle divides the condensation heat exchange chamber into a first condensation heat exchange chamber and a second condensation heat exchange chamber that are interconnected. The smoke inlet duct is located in the first condensation heat exchange chamber, and the heat exchange area of the condensation heat exchange tube in the first condensation heat exchange chamber is greater than the heat exchange area of the condensation heat exchange tube in the second condensation heat exchange chamber.
[0020] In one embodiment, the smoke hood is provided with a pressure pack that protrudes toward the inside of the condensation heat exchange chamber.
[0021] The second technical problem mentioned above is solved by the following technical solution:
[0022] A gas water heater, comprising a condensing heat exchange device as described in any of the above embodiments.
[0023] The gas water heater described in this utility model has the following advantages compared with the prior art:
[0024] The gas water heater provided by this utility model, by applying the above-mentioned condensing heat exchange device, not only prevents condensate from flowing back from the flue and dripping onto the main heat exchange device, thus corroding the main heat exchange device and extending the service life of the gas water heater, but also increases the amount of high-temperature flue gas in the lower middle part of the condensing heat exchange chamber, so that the condensing heat exchange tubes located in the lower middle part of the condensing heat exchange chamber can also fully exchange heat with the high-temperature flue gas, ensuring the heat exchange efficiency of the condensing heat exchange device. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of the condensation heat exchange device provided in a specific embodiment of this utility model;
[0027] Figure 2 This is a cross-sectional view of the condensation heat exchange device provided in a specific embodiment of this utility model;
[0028] Figure 3 This is an exploded view of the condensation heat exchange device provided in a specific embodiment of this utility model;
[0029] Figure 4 This is a schematic diagram of the structure of the shell provided in a specific embodiment of this utility model;
[0030] Figure 5 This is a top view of the housing provided in a specific embodiment of this utility model;
[0031] Figure 6 This is a first-view sectional view of the shell provided in a specific embodiment of this utility model;
[0032] Figure 7 This is a second-view sectional view of the shell provided in a specific embodiment of this utility model;
[0033] Figure 8 This is a structural schematic diagram of the smoke collection hood assembly provided in a specific embodiment of this utility model;
[0034] Figure 9 This is a front view of the smoke collection hood assembly provided in a specific embodiment of this utility model.
[0035] In the picture:
[0036] 1. Shell; 1a. First sidewall; 1b. Second sidewall; 1c. Third sidewall; 11. Condensation heat exchange chamber; 111. First condensation heat exchange chamber; 112. Second condensation heat exchange chamber; 12. Exhaust port; 13. Partition plate; 131. Smoke inlet protrusion; 1311. Smoke inlet flue; 1312. Smoke inlet; 1313. First smoke outlet; 132. Condensate baffle; 133. Smoke outlet protrusion; 1331. Smoke outlet flue; 1332. Second smoke outlet; 14. Smoke inlet chamber; 15. Slot; 16. Water inlet connector mounting hole; 17. Water outlet connector mounting hole;
[0037] 21. Condensation heat exchange tube; 22. Water inlet connector; 23. Water outlet connector; 24. Mounting bracket;
[0038] 3. Smoke hood assembly; 31. Smoke hood; 311. Pressing bag; 32. Smoke baffle;
[0039] 4. Over-temperature protection thermostat;
[0040] 5. Heat insulation cover; 51. Opening; 52. Connecting opening;
[0041] 6. Drainage pipe;
[0042] 7. Smoke exhaust pipe assembly. Detailed Implementation
[0043] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0045] like Figures 1-7As shown, this embodiment provides a condensation heat exchange device, including a shell 1, a condensation heat exchange tube 21, and a condensate baffle 132. The bottom of the condensation heat exchange chamber 11 of the shell 1 is provided with a flue gas inlet protrusion 131 extending into the condensation heat exchange chamber 11. The flue gas inlet protrusion 131 is provided with a flue gas inlet duct 1311, with both ends of the flue gas inlet duct 1311 penetrating the bottom wall of the shell 1 and the upper surface of the flue gas inlet protrusion 131, respectively. One end of the flue gas inlet duct 1311 penetrating the bottom wall of the shell 1 forms a flue gas inlet 1312. The condensation heat exchange tube 21 is disposed within the condensation heat exchange chamber 11. Specifically, the condensation heat exchange tube 21 is coiled in multiple layers along the height direction within the condensation heat exchange chamber 11, and the number of coils in each layer can be the same or different. To facilitate the entry and exit of cold water in the condensation heat exchange tube 21, one end of the condensation heat exchange tube 21 is provided with a water inlet connector 22 for connection to a water inlet pipe, and the other end is provided with a water outlet connector 23 for connection to an water outlet pipe.
[0046] The fixed end of the condensate baffle 132 is connected to the upper surface of the flue gas inlet protrusion 131 to prevent the condensate from the condensing heat exchange tube 21 from dripping into the flue gas inlet duct 1311. A first flue gas outlet 1313 communicating with the flue gas inlet duct 1311 is formed between the front of the condensate baffle 132 and the upper surface of the flue gas inlet protrusion 131. A flue gas outlet protrusion 133 is provided on the side of the condensate baffle 132 facing away from its front side. The flue gas outlet protrusion 133 is provided with a flue gas outlet duct 1331 communicating with the flue gas inlet duct 1311. Along the height direction of the shell 1, the second flue gas outlet 1332 of the flue gas outlet duct 1331 is located in the lower middle part of the condensing heat exchange chamber 11. The orientation of the second flue gas outlet 1332 avoids the direction of condensate dripping from the condensing heat exchange tube 21.
[0047] By providing a flue gas inlet protrusion 131 in the condensing heat exchange chamber 11 and a condensate baffle 132 on the flue gas inlet protrusion 131 to prevent condensate from the condensing heat exchange tube 21 from dripping into the flue gas inlet duct 1311, the condensing heat exchange tube 21 can be coiled directly above the flue gas inlet duct 1311. With a fixed shell volume of the condensing heat exchange device, more condensing heat exchange tubes 21 can be arranged in the condensing heat exchange chamber 11, thus improving the heat exchange efficiency.
[0048] Furthermore, since the first flue gas outlet 1313 and the second flue gas outlet 1332 are located on both sides of the condensate baffle 132, it is beneficial for the flue gas to enter the flue gas inlet duct 1311 and be evenly distributed in the condensation heat exchange chamber 11. The second flue gas outlet 1332 is located in the lower middle part of the condensation heat exchange chamber 11. The high-temperature flue gas entering through the second flue gas outlet 1332 flows to the lower middle part of the condensation heat exchange chamber 11 and exchanges heat with the condensation heat exchange tube 21 located in the lower middle part of the condensation heat exchange chamber 11. This increases the amount of high-temperature flue gas in the lower middle part of the condensation heat exchange chamber 11, so that the condensation heat exchange tube 21 located in the lower middle part of the condensation heat exchange chamber 11 can also fully contact and exchange heat with the high-temperature flue gas, further improving the heat exchange efficiency of the condensation heat exchange device.
[0049] It is easy to understand that the lower middle part of the condensation heat exchange chamber 11 refers to the position less than half of the vertical distance between the top wall and the bottom wall of the condensation heat exchange chamber 11 along the height direction of the shell 1.
[0050] In this embodiment, the condenser housing 1 includes a first sidewall 1a and a second sidewall 1b disposed opposite each other along a first horizontal direction. The second sidewall 1b is provided with a smoke exhaust port 12. The fixed end of the condensate baffle 132 is connected to the upper surface of the smoke inlet protrusion 131 along a second horizontal direction. The free end of the condensate baffle 132 is inclined upward and extends along a direction close to the first sidewall 1a. The smoke outlet protrusion 133 extends along a direction close to the second sidewall 1b.
[0051] Thus, when the high-temperature flue gas entering the flue gas duct 1311 from the bottom of the shell 1 reaches the upper surface of the flue gas duct 131, it splits into two parts. One part flows along the inner wall of the condensate baffle 132 toward the direction close to the first side wall 1a, and flows to the top of the condensation heat exchange chamber 11 under the guidance of the inner wall of the condensate baffle 132 and the first side wall 1a, and then flows horizontally or from top to bottom. Another portion enters the flue gas duct 1331, flows through the second flue gas outlet 1332 to the lower middle part of the condensing heat exchange chamber 11, and then flows horizontally or downward from the lower middle part, increasing the amount of high-temperature flue gas flowing through the lower middle part of the condensing heat exchange chamber 11. This portion of high-temperature flue gas can fully exchange heat with the condensing heat exchange tube 21 located in the lower middle part of the condensing heat exchange chamber 11. The two portions of flue gas merge and are discharged from the exhaust port 12. At the same time, the first sidewall 1a and the second sidewall 1b are arranged opposite each other along the first horizontal direction, which prolongs the flow path of the flue gas, that is, increases the residence time of the flue gas in the condensing heat exchange chamber 11 and improves the heat exchange efficiency.
[0052] The flue duct 1311 may penetrate part of the upper surface of the flue duct 131 or the entire upper surface of the flue duct 131. It is understood that the area of the flue duct 1311 penetrating the upper surface of the flue duct 131 affects the amount of high-temperature flue gas flowing along the inner wall of the condensate baffle 132 toward the direction closer to the first side wall 1a.
[0053] In this embodiment, the housing 1 further includes a third sidewall 1c disposed between the first sidewall 1a and the second sidewall 1b. The third sidewall 1c is provided with an inlet connector mounting hole 16 and an outlet connector mounting hole 17. The inlet connector 22 at one end of the coiled condenser heat exchange tube 21 is fixed through the inlet connector mounting hole 16, and the outlet connector 23 at the other end is fixed through the outlet connector mounting hole 17. By arranging the inlet and outlet pipes on the same side of the housing 1, the layout is more compact.
[0054] Furthermore, in order to ensure the stability of the condensing heat exchange tube 21 within the condensing heat exchange chamber 11, two mounting brackets 24 are provided at intervals within the condensing heat exchange chamber 11, and the coiled condensing heat exchange tube 21 is supported on the two mounting brackets 24.
[0055] like Figure 2 As shown, the flue gas inlet duct 1311 penetrates the entire upper surface of the flue gas inlet protrusion 131. At this time, the amount of high-temperature flue gas flowing along the inner wall of the condensate baffle 132 toward the direction close to the first side wall 1a reaches its maximum, realizing sufficient heat exchange of the condensate heat exchange tube 21 located in the upper part of the condensate heat exchange chamber 11, thereby enabling all condensate heat exchange tubes 21 in the entire condensate heat exchange chamber 11 to fully exchange heat and ensure heat exchange efficiency.
[0056] Of course, in other embodiments, the smoke inlet duct 1311 may partially penetrate the upper surface of the smoke inlet protrusion 131, that is, the upper surface of the smoke inlet protrusion 131 near the first side wall 1a is partially obscured, that is, the side wall of the smoke inlet protrusion 131 near the first side wall 1a is bent horizontally for a distance; or, the upper surface of the smoke inlet protrusion 131 near the second side wall 1b is partially obscured, that is, the side wall of the smoke inlet protrusion 131 near the second side wall 1b is bent horizontally for a distance and then bent obliquely upward.
[0057] In one embodiment, the plane of the first flue gas outlet 1313 is parallel to the vertical direction, or the plane of the first flue gas outlet 1313 is inclined from bottom to top along the direction close to the first side wall 1a. The first flue gas outlet 1313 must not only ensure that the high-temperature flue gas flows out from here, along the inner wall of the condensate baffle 132, and flows upward to the upper part of the condensation heat exchange chamber 11 due to the obstruction of the first side wall 1a; it must also ensure that the condensate generated after the condensation heat exchange tube 21 located at the upper part of the condensation heat exchange chamber 11 after heat exchange will not drip from the first flue gas outlet 1313 to the flue gas inlet duct 1311, and fall from the bottom of the shell 1 onto the main heat exchange device, corroding the main heat exchange device.
[0058] like Figure 2 As shown, the plane where the first smoke outlet 1313 is located is parallel to the vertical direction, so that when the condensate falls down, it flows obliquely downward along the condensate baffle 132 and will not fall into the first smoke outlet 1313.
[0059] Of course, in other embodiments, the condensate baffle 132 can also be extended further towards the first sidewall 1a, so that the plane where the first smoke outlet 1313 is located is inclined from bottom to top along the direction close to the first sidewall 1a, thus improving the water-blocking effect of the condensate baffle 132. Alternatively, a portion of the upper surface of the smoke inlet protrusion 131 of the smoke inlet duct 131 is left near the first sidewall 1a to block it, and the condensate baffle 132 extends upward at an incline to block the upper surface of the smoke inlet protrusion 131 of the smoke inlet duct 1311 in its projection in the horizontal plane, which also makes the plane where the first smoke outlet 1313 is located inclined from bottom to top along the direction close to the first sidewall 1a.
[0060] Furthermore, the plane of the second flue gas outlet 1332 is parallel to the vertical direction; or the plane of the second flue gas outlet 1332 is inclined from bottom to top along the direction close to the second side wall 1b. The second flue gas outlet 1332 is oriented towards the second side wall 1b or towards the bottom of the condensing heat exchange chamber 11. This not only ensures that the high-temperature flue gas flowing out of the second flue gas outlet 1332 flows towards the condensing heat exchange tube 21 located in the lower part of the condensing heat exchange chamber 11, but also prevents condensate from falling into the flue gas inlet duct 1311 through the second flue gas outlet 1332.
[0061] like Figure 2 As shown, the plane of the second flue gas outlet 1332 is parallel to the vertical direction. The condensate formed after heat exchange by the condensing heat exchange tube 21 located directly above the condensate baffle 132 falls into the V-shaped water collection trough formed by the condensate baffle 132 and one side wall of the flue gas outlet protrusion 133. Then, it flows through the V-shaped water collection trough along both ends in the second horizontal direction to the bottom of the condensing heat exchange chamber 11. This arrangement ensures that the side wall of the flue gas outlet protrusion 133 forming the V-shaped water collection trough will not interfere with the condensing heat exchange tube 21.
[0062] Of course, in other embodiments, the sidewall of the smoke outlet protrusion 133 forming the V-shaped water collection trough can be extended further, so that the plane where the second smoke outlet 1332 is located is inclined from bottom to top along the direction close to the second sidewall 1b. In this way, the high-temperature flue gas flowing out of the second smoke outlet 1332 will be blocked by the sidewall extension of the smoke outlet protrusion 133, and more high-temperature flue gas will flow downwards. However, it may interfere with the condenser heat exchange tube 21, and the length of the extension needs to be calculated accurately.
[0063] In one embodiment, the minimum flow area of the flue gas inlet 1311 is 1 to 1.2 times the flow area of the exhaust port 12. Setting the minimum flow area of the flue gas inlet 1311 to 1 to 1.2 times the flow area of the exhaust port 12 reduces the exhaust resistance and ensures that the exhaust resistance of the high-temperature flue gas flowing through the condensation heat exchanger is constant and appropriate.
[0064] In one embodiment, the central axis of the flue gas outlet 1331 is perpendicular to the surface of the condensate baffle 132. This reduces the air outlet resistance of the flue gas outlet 1331 and helps to improve the uniformity of flue gas distribution in the condensation heat exchange chamber 11.
[0065] In one embodiment, the projection of the condensate baffle 132 in the horizontal plane coincides with the projection of the plane containing the outlet of the flue duct 1311 in the horizontal plane. For example... Figure 2 As shown, the condensate baffle 132 completely blocks the through end of the flue duct 1311 and the upper surface of the flue duct 131, so as to ensure that the upper through end of the flue duct 1311 is completely covered, and the condensate formed after heat exchange by the condensation heat exchange tube 21 located above the condensate baffle 132 will not enter the flue duct 1311.
[0066] In one embodiment, the condenser heat exchange tube 21 spirals from the side closest to the second sidewall 1b to directly above the flue gas inlet duct 1311. This arrangement can fully utilize the internal space of the condenser heat exchange chamber 11, increase the spiral length of the condenser heat exchange tube 21 within the condenser heat exchange chamber 11, and thus improve heat exchange efficiency; at the same time, it can also ensure that the condensate from the condenser heat exchange tube 21 located directly above the flue gas inlet duct 1311 will not fall into the flue gas inlet duct 1311.
[0067] In one embodiment, multiple smoke outlet protrusions 133 are evenly distributed along the second horizontal direction. Each smoke outlet protrusion 133 is provided with a smoke outlet flue 1331 to form multiple second smoke outlets 1332. By evenly distributing multiple first smoke outlets 1313 along the second horizontal direction, the high-temperature flue gas flows uniformly to different positions along the second horizontal direction of the condensing heat exchange tube 21 located in the lower part of the condensing heat exchange chamber 11. Even if the length of the condensing heat exchange tube 21 at the same height is relatively long, it can be ensured that different positions of the longer condensing heat exchange tube 21 can fully exchange heat with the high-temperature flue gas, thus ensuring the uniformity of heat exchange in the condensing heat exchange chamber 11.
[0068] Furthermore, grooves for guiding the flow of condensate are provided both inside the condensation heat exchange chamber 11 and on the condensate baffle 132.
[0069] The shell 1 is made of PPS (Polyphenylene sulfide) + 30% GF (Glass Fiber) injection molding, which can withstand the corrosion of 200℃ high temperature and weak acidic condensate.
[0070] Specifically, the second sidewall 1b is provided with a flue gas outlet 12, the water inlet pipe is set in the condensing heat exchange chamber 11 near the flue gas outlet 12, and the water outlet pipe is set in the condensing heat exchange chamber 11 near the flue gas inlet 1311, so as to ensure that the heat of the flue gas in the condensing heat exchange chamber 11 and the average temperature difference between the condensing heat exchange tube 21 are maximized, thereby maximizing the utilization of the heat of the flue gas and improving the heat exchange efficiency.
[0071] Furthermore, the condensing heat exchange device also includes a flue pipe assembly 7, which is located on the outside of the housing 1 and is positioned corresponding to the flue outlet 12. The flue pipe assembly 7 is used to guide the flue gas discharged from the flue outlet 12 before it is discharged.
[0072] In one embodiment, a partition plate 13 is provided inside the housing 1, dividing the housing 1 into a condensation heat exchange chamber 11 and a flue gas inlet chamber 14. A flue gas inlet duct 1311 is disposed on the partition plate 13. The partition plate 13 separates the high-temperature flue gas separated by the main heat exchange device from the condensation heat exchange chamber 11. The partition plate 13 is inclined inside the housing 1 to facilitate the discharge of condensate and backflow rainwater from the housing 1. The inclination angle of the partition plate 13 is determined based on the structure of the condensation heat exchange tube 21 inside the condensation heat exchange chamber 11 and the resistance of the flue gas flow path.
[0073] A drain outlet is also provided inside the condensing heat exchange chamber 11. The drain outlet is located at the lowest position inside the condensing heat exchange chamber 11 and is connected to the drain pipe 6 to facilitate the discharge of condensate. After the cold water in the condensing heat exchange tube 21 in the condensing heat exchange chamber 11 exchanges heat with the high-temperature flue gas, the condensate formed outside the condensing heat exchange tube 21 drips onto the partition plate 13 and then enters the drain pipe 6 through the drain outlet and is discharged.
[0074] Specifically, the drain outlet and the flue gas outlet 12 are respectively located on adjacent side walls of the shell 1. The partition plate 13 is inclined downward from the side wall away from the flue gas outlet 12 towards the side wall near the flue gas outlet 12. The partition plate 13 is also inclined downward from the side wall away from the drain outlet towards the side wall near the drain outlet. This allows the partition plate 13 to not only guide the high-temperature flue gas in the condensing heat exchange chamber 11 downward, so that the high-temperature flue gas can exchange heat with the condensing heat exchange tube 21 near the partition plate 13, ensuring sufficient heat exchange, but also to guide the condensate towards the drain outlet, preventing the condensate from accumulating in the condensing heat exchange chamber 11.
[0075] Specifically, the flue 1311, the partition plate 13, and the shell 1 are injection molded as a single unit, such as... Figure 6 As shown, the angle between the partition plate 13 and the side wall where the drain outlet is located is α, where α is 91°; Figure 7 As shown, the angle between the partition plate 13 and the side wall where the exhaust port 12 is located is β, where β is 92°. That is, the partition plate 13 is inclined at 1° towards the drain port and at 2° towards the exhaust port 12. The partition plate 13 is inclined as a whole towards the drain port, and the drain port is located at the lowest point on the inner side of the partition plate 13, so as to facilitate the timely discharge of condensate and backflow rainwater from the housing 1.
[0076] Continue to refer to Figure 2 and Figure 3A heat insulation cover 5 is installed inside the flue gas inlet chamber 14. One end of the heat insulation cover 5 is an open opening 51, which is circumferentially connected to the bottom of the shell 1. The other end of the heat insulation cover 5 is connected to the flue gas inlet duct 1311. Pre-set gaps are left between the heat insulation cover 5 and the side wall of the shell 1, and between the heat insulation cover 5 and the partition plate 13, so that a heat insulation cavity is formed between the heat insulation cover 5 and the side wall of the shell 1, and between the heat insulation cover 5 and the shell 1. The heat insulation cavity separates the high-temperature flue gas from the shell 1. The function of the heat insulation cover 5 is to protect the shell 1 of the injection molded part from the possibility that due to poor heat exchange of the main heat exchange device, the high-temperature flue gas flows to the condensation heat exchange device without sufficient heat exchange, and the flue gas temperature exceeds the maximum temperature resistance temperature of the shell 1, causing the shell 1 to melt at high temperature.
[0077] For example, the preset gap is 2mm to 3mm.
[0078] Specifically, the heat insulation cover 5 is made of aluminized sheet, which has a higher temperature resistance than injection-molded parts. The heat insulation cover 5 is snapped into the housing 1, and the circumference of the opening 51 of the heat insulation cover 5 is set as the outer edge, which abuts against the bottom of the housing 1. The other end of the heat insulation cover 5 is provided with a connecting port 52 adapted to the inlet of the flue gas duct 1311. The high-temperature flue gas in the main heat exchange device enters the heat insulation cover 5 through the opening 51, and then enters the flue gas duct 1311 through the connecting port 52.
[0079] In one embodiment, such as Figure 2 , Figures 8-9 As shown, the condensing heat exchange device also includes a smoke collection hood assembly 3, which includes a smoke collection hood 31 and a smoke baffle 32. The smoke collection hood 31 covers the top of the condensing heat exchange chamber 11 and is used to seal the condensing heat exchange chamber 11. One end of the smoke baffle 32 is connected to the smoke collection hood 31, and the other end extends into the condensing heat exchange chamber 11 and extends to the middle and below of the condensing heat exchange chamber 11. The smoke baffle 32 divides the condensing heat exchange chamber 11 into a first condensing heat exchange chamber 111 and a second condensing heat exchange chamber 112 that are interconnected. The smoke inlet duct 1311 is located in the first condensing heat exchange chamber 111, and the heat exchange area of the condensing heat exchange tube 21 in the first condensing heat exchange chamber 111 is larger than the heat exchange area of the condensing heat exchange tube 21 in the second condensing heat exchange chamber 112. The baffle plate 32 guides the high-temperature flue gas, directing it to the lowest level of the condensing heat exchange tube 21 within the condensing heat exchange chamber 11. This ensures that the high-temperature flue gas in both the first condensing heat exchange chamber 111 and the second condensing heat exchange chamber 112 can fully exchange heat with the condensing heat exchange tube 21. Dividing the condensing heat exchange chamber 11 into the first condensing heat exchange chamber 111 and the second condensing heat exchange chamber 112 increases the exhaust resistance, prolongs the residence time of the high-temperature flue gas within the condensing heat exchange chamber 11, and enhances heat exchange.
[0080] Specifically, such as Figure 4 and Figure 5As shown, the smoke hood 31 is made of aluminum-plated plate, which can withstand high temperatures. Slots 15 are provided on both opposite side walls inside the housing 1. One end of the smoke baffle 32 is fixed to the smoke hood 31 by spot welding or riveting. The opposite sides of the smoke baffle 32 are respectively engaged in the two slots 15 to ensure the stability of the smoke baffle 32 within the condensing heat exchange chamber 11, preventing it from shifting due to airflow impact and affecting heat exchange within the condensing heat exchange chamber 11.
[0081] Furthermore, continue to refer to Figure 2 and Figure 3 The smoke baffle 32 has multiple smoke vents evenly distributed to ensure that the high-temperature flue gas in the first condensation heat exchange chamber 111 can flow evenly into the second condensation heat exchange chamber 112.
[0082] Specifically, the condensing heat exchange tubes 21 are coiled in three layers within the condensing heat exchange chamber 11, with the top layer coiled in four rows and the remaining two layers coiled in three rows. The flue gas inlet duct 1311 is located below the condensing heat exchange tubes 21 on the side of the top layer furthest from the exhaust port 12. One row of condensing heat exchange tubes 21 is arranged between the partition plate 13 and the side wall where the exhaust port 12 is located; that is, one row of condensing heat exchange tubes 21 is arranged within the second condensing heat exchange chamber 112, and the remaining three rows of condensing heat exchange tubes 21 are located within the first condensing heat exchange chamber 111. This extends the residence time of the high-temperature flue gas within the condensing heat exchange chamber 11 and enhances the heat exchange effect.
[0083] In one embodiment, the smoke hood 31 is provided with a pressure bulge 311 protruding towards the inside of the first condensing heat exchange chamber 111. This reduces the flow area of the flue gas passage at the top of the first condensing heat exchange chamber 111, reduces the amount of flue gas passing through the top of the condensing heat exchange chamber 11, guides the high-temperature flue gas to flow downward, and allows it to contact the condensing heat exchange tube 21 located in the lower part of the condensing heat exchange chamber 11 for heat exchange as much as possible.
[0084] In one embodiment, the second smoke outlet 1332, the first smoke outlet 1313, and the smoke exhaust outlet 12 are all positioned above the lowest point of the baffle plate 32 to prevent the condensate drain pipe 6 from becoming blocked and to prevent condensate from flowing back into the main heat exchange device before the gas water heater reports a fault.
[0085] In one embodiment, the smoke baffle 32 is made of stainless steel, and its surface is mirror-finished to reflect the heat radiated by the high-temperature flue gas, thereby enhancing the heat exchange between the condenser heat exchange tube 21 and the high-temperature flue gas. Preferably, the smoke baffle 32 is made of 201 stainless steel.
[0086] In one embodiment, an over-temperature protection thermostat 4 is installed inside the first condensing heat exchange chamber 111. The over-temperature protection thermostat 4 is located on the smoke hood 31 and directly above the first smoke outlet 1313. When the over-temperature protection thermostat 4 detects that the high-temperature flue gas flowing out of the first smoke outlet 1313 exceeds the set temperature, the over-temperature protection thermostat 4 sends a signal to the controller of the gas water heater. The controller then disconnects the power supply to prevent overheating damage or fire. To ensure that the over-temperature protection thermostat 4 can identify dry burning over-temperature conditions in each load segment, the installation position of the over-temperature protection thermostat 4 is close to the smallest combustion section of the burner.
[0087] This embodiment also provides a gas water heater, including the aforementioned condensing heat exchange device. By using this condensing heat exchange device, the gas water heater not only prevents condensate from flowing back from the flue 1311 and dripping onto the main heat exchange device, thus corroding it and extending its service life, but also increases the volume of high-temperature flue gas in the lower part of the condensing heat exchange chamber 11. This allows the condensing heat exchange tube 21, located in the lower part of the condensing heat exchange chamber 11, to also fully exchange heat with the high-temperature flue gas, ensuring the heat exchange efficiency of the condensing heat exchange device.
[0088] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A condensing heat exchanger, characterized in that, include: The shell (1) is provided with a condensation heat exchange chamber (11). The bottom of the condensation heat exchange chamber (11) is provided with a smoke inlet protrusion (131) extending into the condensation heat exchange chamber (11). The smoke inlet protrusion (131) is provided with a smoke inlet flue (1311). The two ends of the smoke inlet flue (1311) respectively penetrate the bottom wall of the shell (1) and the upper surface of the smoke inlet protrusion (131). A condensing heat exchange tube (21) is disposed inside the condensing heat exchange chamber (11); A condensate baffle (132) is provided, with its fixed end connected to the upper surface of the flue gas inlet protrusion (131) to prevent condensate from the condensation heat exchange tube (21) from dripping into the flue gas inlet duct (1311). A first flue gas outlet (1313) communicating with the flue gas inlet duct (1311) is formed between the front surface of the condensate baffle (132) and the upper surface of the flue gas inlet protrusion (131). 2) A smoke outlet protrusion (133) is provided on the side opposite to the front. The smoke outlet protrusion (133) is provided with a smoke outlet flue (1331) that communicates with the smoke inlet flue (1311). Along the height direction of the shell (1), the second smoke outlet (1332) of the smoke outlet flue (1331) is located in the middle and lower part of the condensation heat exchange chamber (11). The orientation of the second smoke outlet (1332) avoids the direction of condensate dripping from the condensation heat exchange tube (21).
2. The condensation heat exchanger according to claim 1, characterized in that, The housing (1) includes a first sidewall (1a) and a second sidewall (1b) arranged opposite each other along a first horizontal direction. The second sidewall (1b) is provided with a smoke exhaust port (12). The fixed end of the condensate baffle (132) is connected to the upper surface of the smoke inlet protrusion (131) along a second horizontal direction. The free end of the condensate baffle (132) is inclined upward and extends along a direction close to the first sidewall (1a). The smoke outlet protrusion (133) extends along a direction close to the second sidewall (1b).
3. The condensation heat exchanger according to claim 2, characterized in that, The plane containing the first smoke outlet (1313) is parallel to the vertical direction, or the plane containing the first smoke outlet (1313) is inclined from bottom to top along the direction close to the first sidewall (1a); and / or, The plane containing the second smoke outlet (1332) is parallel to the vertical direction; or the plane containing the second smoke outlet (1332) is inclined from bottom to top along the direction close to the second side wall (1b).
4. The condensation heat exchanger according to claim 2, characterized in that, The minimum flow area of the inlet flue (1311) is 1 to 1.2 times the flow area of the exhaust port (12).
5. The condensation heat exchanger according to claim 1, characterized in that, The central axis of the flue (1331) is perpendicular to the surface of the condensate baffle (132).
6. The condensation heat exchanger according to claim 1, characterized in that, The smoke-emitting protrusions (133) are evenly distributed at intervals along the second horizontal direction.
7. The condensation heat exchanger according to claim 1, characterized in that, The projection of the condensate baffle (132) in the horizontal plane coincides with the projection of the plane where the outlet of the flue (1311) is located in the horizontal plane.
8. The condensation heat exchanger according to claim 1, characterized in that, The condensing heat exchange device further includes a smoke collection hood assembly (3), which includes a smoke collection hood (31) and a smoke baffle (32). The smoke collection hood (31) is installed on the top of the condensing heat exchange chamber (11) to seal the condensing heat exchange chamber (11). One end of the smoke baffle (32) is connected to the smoke collection hood (31), and the other end extends into the condensing heat exchange chamber (11) and extends to the middle and below of the condensing heat exchange chamber (11). The baffle plate (32) divides the condensing heat exchange chamber (11) into a first condensing heat exchange chamber (111) and a second condensing heat exchange chamber (112) that are interconnected. The flue gas inlet (1311) is located in the first condensing heat exchange chamber (111), and the heat exchange area of the condensing heat exchange tube (21) in the first condensing heat exchange chamber (111) is greater than the heat exchange area of the condensing heat exchange tube (21) in the second condensing heat exchange chamber (112).
9. The condensation heat exchanger according to claim 8, characterized in that, The smoke hood (31) is provided with a pressure pack (311) that protrudes toward the inside of the first condensation heat exchange chamber (111).
10. A gas-fired water heater, characterized in that, Includes the condensation heat exchange device as described in any one of claims 1-9.